/* GTK - The GIMP Toolkit
 * gtktextview.c Copyright (C) 2000 Red Hat, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

/*
 * Modified by the GTK+ Team and others 1997-2000.  See the AUTHORS
 * file for a list of people on the GTK+ Team.  See the ChangeLog
 * files for a list of changes.  These files are distributed with
 * GTK+ at ftp://ftp.gtk.org/pub/gtk/. 
 */

#include <string.h>

#include "gtkbindings.h"
#include "gtkdnd.h"
#include "gtkintl.h"
#include "gtkmain.h"
#include "gtkmenu.h"
#include "gtkmenuitem.h"
#include "gtksignal.h"
#include "gtktext.h"
#include "gtktextdisplay.h"
#include "gtktextview.h"
#include "gtkimmulticontext.h"
#include "gdk/gdkkeysyms.h"
#include <string.h>

#define FOCUS_EDGE_WIDTH 1
#define DRAG_THRESHOLD 8

#define SCREEN_WIDTH(widget) text_window_get_width (GTK_TEXT_VIEW (widget)->text_window)
#define SCREEN_HEIGHT(widget) text_window_get_height (GTK_TEXT_VIEW (widget)->text_window)

enum {
  MOVE_CURSOR,
  SET_ANCHOR,
  INSERT_AT_CURSOR,
  DELETE_FROM_CURSOR,
  CUT_CLIPBOARD,
  COPY_CLIPBOARD,
  PASTE_CLIPBOARD,
  TOGGLE_OVERWRITE,
  SET_SCROLL_ADJUSTMENTS,
  LAST_SIGNAL
};

enum {
  ARG_0,
  ARG_HEIGHT_LINES,
  ARG_WIDTH_COLUMNS,
  ARG_PIXELS_ABOVE_LINES,
  ARG_PIXELS_BELOW_LINES,
  ARG_PIXELS_INSIDE_WRAP,
  ARG_EDITABLE,
  ARG_WRAP_MODE,
  LAST_ARG
};

static void gtk_text_view_init                 (GtkTextView      *text_view);
static void gtk_text_view_class_init           (GtkTextViewClass *klass);
static void gtk_text_view_destroy              (GtkObject        *object);
static void gtk_text_view_finalize             (GObject          *object);
static void gtk_text_view_set_arg              (GtkObject        *object,
                                                GtkArg           *arg,
                                                guint             arg_id);
static void gtk_text_view_get_arg              (GtkObject        *object,
                                                GtkArg           *arg,
                                                guint             arg_id);
static void gtk_text_view_size_request         (GtkWidget        *widget,
                                                GtkRequisition   *requisition);
static void gtk_text_view_size_allocate        (GtkWidget        *widget,
                                                GtkAllocation    *allocation);
static void gtk_text_view_realize              (GtkWidget        *widget);
static void gtk_text_view_unrealize            (GtkWidget        *widget);
static void gtk_text_view_style_set            (GtkWidget        *widget,
                                                GtkStyle         *previous_style);
static void gtk_text_view_direction_changed    (GtkWidget        *widget,
                                                GtkTextDirection  previous_direction);
static gint gtk_text_view_event                (GtkWidget        *widget,
                                                GdkEvent         *event);
static gint gtk_text_view_key_press_event      (GtkWidget        *widget,
                                                GdkEventKey      *event);
static gint gtk_text_view_key_release_event    (GtkWidget        *widget,
                                                GdkEventKey      *event);
static gint gtk_text_view_button_press_event   (GtkWidget        *widget,
                                                GdkEventButton   *event);
static gint gtk_text_view_button_release_event (GtkWidget        *widget,
                                                GdkEventButton   *event);
static gint gtk_text_view_focus_in_event       (GtkWidget        *widget,
                                                GdkEventFocus    *event);
static gint gtk_text_view_focus_out_event      (GtkWidget        *widget,
                                                GdkEventFocus    *event);
static gint gtk_text_view_motion_event         (GtkWidget        *widget,
                                                GdkEventMotion   *event);
static void gtk_text_view_draw                 (GtkWidget        *widget,
                                                GdkRectangle     *area);
static gint gtk_text_view_expose_event         (GtkWidget        *widget,
                                                GdkEventExpose   *expose);
static void gtk_text_view_draw_focus           (GtkWidget        *widget);

/* Source side drag signals */
static void gtk_text_view_drag_begin       (GtkWidget        *widget,
                                            GdkDragContext   *context);
static void gtk_text_view_drag_end         (GtkWidget        *widget,
                                            GdkDragContext   *context);
static void gtk_text_view_drag_data_get    (GtkWidget        *widget,
                                            GdkDragContext   *context,
                                            GtkSelectionData *selection_data,
                                            guint             info,
                                            guint             time);
static void gtk_text_view_drag_data_delete (GtkWidget        *widget,
                                            GdkDragContext   *context);

/* Target side drag signals */
static void     gtk_text_view_drag_leave         (GtkWidget        *widget,
                                                  GdkDragContext   *context,
                                                  guint             time);
static gboolean gtk_text_view_drag_motion        (GtkWidget        *widget,
                                                  GdkDragContext   *context,
                                                  gint              x,
                                                  gint              y,
                                                  guint             time);
static gboolean gtk_text_view_drag_drop          (GtkWidget        *widget,
                                                  GdkDragContext   *context,
                                                  gint              x,
                                                  gint              y,
                                                  guint             time);
static void     gtk_text_view_drag_data_received (GtkWidget        *widget,
                                                  GdkDragContext   *context,
                                                  gint              x,
                                                  gint              y,
                                                  GtkSelectionData *selection_data,
                                                  guint             info,
                                                  guint             time);

static void gtk_text_view_set_scroll_adjustments (GtkTextView   *text_view,
                                                  GtkAdjustment *hadj,
                                                  GtkAdjustment *vadj);

static void gtk_text_view_move_cursor      (GtkTextView           *text_view,
                                            GtkMovementStep        step,
                                            gint                   count,
                                            gboolean               extend_selection);
static void gtk_text_view_set_anchor       (GtkTextView           *text_view);
static void gtk_text_view_scroll_pages     (GtkTextView           *text_view,
                                            gint                   count);
static void gtk_text_view_insert_at_cursor (GtkTextView           *text_view,
                                            const gchar           *str);
static void gtk_text_view_delete_from_cursor (GtkTextView           *text_view,
                                              GtkDeleteType          type,
                                              gint                   count);
static void gtk_text_view_cut_clipboard    (GtkTextView           *text_view);
static void gtk_text_view_copy_clipboard   (GtkTextView           *text_view);
static void gtk_text_view_paste_clipboard  (GtkTextView           *text_view);
static void gtk_text_view_toggle_overwrite (GtkTextView           *text_view);
static void gtk_text_view_unselect         (GtkTextView           *text_view);

static void     gtk_text_view_validate_onscreen     (GtkTextView        *text_view);
static void     gtk_text_view_get_first_para_iter   (GtkTextView        *text_view,
                                                     GtkTextIter        *iter);
static void     gtk_text_view_scroll_calc_now       (GtkTextView        *text_view);
static void     gtk_text_view_set_attributes_from_style (GtkTextView        *text_view,
                                                         GtkTextAttributes *values,
                                                         GtkStyle           *style);
static void     gtk_text_view_ensure_layout         (GtkTextView        *text_view);
static void     gtk_text_view_destroy_layout        (GtkTextView        *text_view);
static void     gtk_text_view_reset_im_context      (GtkTextView        *text_view);
static void     gtk_text_view_start_selection_drag  (GtkTextView        *text_view,
                                                     const GtkTextIter  *iter,
                                                     GdkEventButton     *event);
static gboolean gtk_text_view_end_selection_drag    (GtkTextView        *text_view,
                                                     GdkEventButton     *event);
static void     gtk_text_view_start_selection_dnd   (GtkTextView        *text_view,
                                                     const GtkTextIter  *iter,
                                                     GdkEventMotion     *event);
static void     gtk_text_view_start_cursor_blink    (GtkTextView        *text_view);
static void     gtk_text_view_stop_cursor_blink     (GtkTextView        *text_view);

static void gtk_text_view_value_changed           (GtkAdjustment *adj,
						   GtkTextView   *view);
static void gtk_text_view_commit_handler          (GtkIMContext  *context,
						   const gchar   *str,
						   GtkTextView   *text_view);
static void gtk_text_view_preedit_changed_handler (GtkIMContext  *context,
						   GtkTextView   *text_view);

static void gtk_text_view_mark_set_handler       (GtkTextBuffer     *buffer,
                                                  const GtkTextIter *location,
                                                  GtkTextMark       *mark,
                                                  gpointer           data);
static void gtk_text_view_get_virtual_cursor_pos (GtkTextView       *text_view,
                                                  gint              *x,
                                                  gint              *y);
static void gtk_text_view_set_virtual_cursor_pos (GtkTextView       *text_view,
                                                  gint               x,
                                                  gint               y);

static GtkAdjustment* get_hadjustment            (GtkTextView       *text_view);
static GtkAdjustment* get_vadjustment            (GtkTextView       *text_view);

static void gtk_text_view_popup_menu             (GtkTextView       *text_view,
						  GdkEventButton    *event);
 
/* Container methods */
static void gtk_text_view_add    (GtkContainer *container,
                                  GtkWidget    *child);
static void gtk_text_view_remove (GtkContainer *container,
                                  GtkWidget    *child);
static void gtk_text_view_forall (GtkContainer *container,
                                  gboolean      include_internals,
                                  GtkCallback   callback,
                                  gpointer      callback_data);

/* FIXME probably need the focus methods. */

typedef struct _GtkTextViewChild GtkTextViewChild;

struct _GtkTextViewChild
{
  GtkWidget *widget;

  GtkTextChildAnchor *anchor;

  /* These are ignored if anchor != NULL */
  GtkTextWindowType type;
  gint x;
  gint y;
};

static GtkTextViewChild* text_view_child_new_anchored (GtkWidget          *child,
                                                       GtkTextChildAnchor *anchor,
                                                       GtkTextLayout      *layout);
static GtkTextViewChild* text_view_child_new_window   (GtkWidget          *child,
                                                       GtkTextWindowType   type,
                                                       gint                x,
                                                       gint                y);
static void              text_view_child_free         (GtkTextViewChild   *child);

static void              text_view_child_realize      (GtkTextView      *text_view,
                                                       GtkTextViewChild *child);

struct _GtkTextWindow
{
  GtkTextWindowType type;
  GtkWidget *widget;
  GdkWindow *window;
  GdkWindow *bin_window;
  GtkRequisition requisition;
  GdkRectangle allocation;
};

static GtkTextWindow *text_window_new             (GtkTextWindowType  type,
                                                   GtkWidget         *widget,
                                                   gint               width_request,
                                                   gint               height_request);
static void           text_window_free            (GtkTextWindow     *win);
static void           text_window_realize         (GtkTextWindow     *win,
                                                   GdkWindow         *parent);
static void           text_window_unrealize       (GtkTextWindow     *win);
static void           text_window_size_allocate   (GtkTextWindow     *win,
                                                   GdkRectangle      *rect);
static void           text_window_scroll          (GtkTextWindow     *win,
                                                   gint               dx,
                                                   gint               dy);
static void           text_window_invalidate_rect (GtkTextWindow     *win,
                                                   GdkRectangle      *rect);

static gint           text_window_get_width       (GtkTextWindow     *win);
static gint           text_window_get_height      (GtkTextWindow     *win);
static void           text_window_get_allocation  (GtkTextWindow     *win,
                                                   GdkRectangle      *rect);


enum
{
  TARGET_STRING,
  TARGET_TEXT,
  TARGET_COMPOUND_TEXT,
  TARGET_UTF8_STRING,
  TARGET_TEXT_BUFFER_CONTENTS
};

static GtkTargetEntry target_table[] = {
  { "GTK_TEXT_BUFFER_CONTENTS", GTK_TARGET_SAME_APP,
    TARGET_TEXT_BUFFER_CONTENTS },
  { "UTF8_STRING", 0, TARGET_UTF8_STRING },
  { "COMPOUND_TEXT", 0, TARGET_COMPOUND_TEXT },
  { "TEXT", 0, TARGET_TEXT },
  { "text/plain", 0, TARGET_STRING },
  { "STRING",     0, TARGET_STRING }
};

static GtkContainerClass *parent_class = NULL;
static guint signals[LAST_SIGNAL] = { 0 };

GtkType
gtk_text_view_get_type (void)
{
  static GtkType our_type = 0;

  if (our_type == 0)
    {
      static const GtkTypeInfo our_info =
      {
        "GtkTextView",
        sizeof (GtkTextView),
        sizeof (GtkTextViewClass),
        (GtkClassInitFunc) gtk_text_view_class_init,
        (GtkObjectInitFunc) gtk_text_view_init,
        /* reserved_1 */ NULL,
        /* reserved_2 */ NULL,
        (GtkClassInitFunc) NULL
      };

      our_type = gtk_type_unique (GTK_TYPE_CONTAINER, &our_info);
    }

  return our_type;
}

static void
add_move_binding (GtkBindingSet  *binding_set,
                  guint           keyval,
                  guint           modmask,
                  GtkMovementStep step,
                  gint            count)
{
  g_return_if_fail ((modmask & GDK_SHIFT_MASK) == 0);

  gtk_binding_entry_add_signal (binding_set, keyval, modmask,
                                "move_cursor", 3,
                                GTK_TYPE_ENUM, step,
                                GTK_TYPE_INT, count,
                                GTK_TYPE_BOOL, FALSE);

  /* Selection-extending version */
  gtk_binding_entry_add_signal (binding_set, keyval, modmask | GDK_SHIFT_MASK,
                                "move_cursor", 3,
                                GTK_TYPE_ENUM, step,
                                GTK_TYPE_INT, count,
                                GTK_TYPE_BOOL, TRUE);
}

static void
gtk_text_view_class_init (GtkTextViewClass *klass)
{
  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
  GtkObjectClass *object_class = GTK_OBJECT_CLASS (klass);
  GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
  GtkContainerClass *container_class = GTK_CONTAINER_CLASS (klass);
  GtkBindingSet *binding_set;

  parent_class = gtk_type_class (GTK_TYPE_CONTAINER);

  /*
   * Arguments
   */
  gtk_object_add_arg_type ("GtkTextView::height_lines", GTK_TYPE_INT,
                           GTK_ARG_READWRITE, ARG_HEIGHT_LINES);
  gtk_object_add_arg_type ("GtkTextView::width_columns", GTK_TYPE_INT,
                           GTK_ARG_READWRITE, ARG_WIDTH_COLUMNS);
  gtk_object_add_arg_type ("GtkTextView::pixels_above_lines", GTK_TYPE_INT,
                           GTK_ARG_READWRITE, ARG_PIXELS_ABOVE_LINES);
  gtk_object_add_arg_type ("GtkTextView::pixels_below_lines", GTK_TYPE_INT,
                           GTK_ARG_READWRITE, ARG_PIXELS_BELOW_LINES);
  gtk_object_add_arg_type ("GtkTextView::pixels_inside_wrap", GTK_TYPE_INT,
                           GTK_ARG_READWRITE, ARG_PIXELS_INSIDE_WRAP);
  gtk_object_add_arg_type ("GtkTextView::editable", GTK_TYPE_BOOL,
                           GTK_ARG_READWRITE, ARG_EDITABLE);
  gtk_object_add_arg_type ("GtkTextView::wrap_mode", GTK_TYPE_ENUM,
                           GTK_ARG_READWRITE, ARG_WRAP_MODE);


  /*
   * Signals
   */

  signals[MOVE_CURSOR] =
    gtk_signal_new ("move_cursor",
                    GTK_RUN_LAST | GTK_RUN_ACTION,
                    GTK_CLASS_TYPE (object_class),
                    GTK_SIGNAL_OFFSET (GtkTextViewClass, move_cursor),
                    gtk_marshal_VOID__ENUM_INT_BOOLEAN,
                    GTK_TYPE_NONE, 3, GTK_TYPE_MOVEMENT_STEP, GTK_TYPE_INT, GTK_TYPE_BOOL);

  signals[SET_ANCHOR] =
    gtk_signal_new ("set_anchor",
                    GTK_RUN_LAST | GTK_RUN_ACTION,
                    GTK_CLASS_TYPE (object_class),
                    GTK_SIGNAL_OFFSET (GtkTextViewClass, set_anchor),
                    gtk_marshal_VOID__VOID,
                    GTK_TYPE_NONE, 0);

  signals[INSERT_AT_CURSOR] =
    gtk_signal_new ("insert_at_cursor",
                    GTK_RUN_LAST | GTK_RUN_ACTION,
                    GTK_CLASS_TYPE (object_class),
                    GTK_SIGNAL_OFFSET (GtkTextViewClass, insert_at_cursor),
                    gtk_marshal_VOID__POINTER,
                    GTK_TYPE_NONE, 1, GTK_TYPE_STRING);

  signals[DELETE_FROM_CURSOR] =
    gtk_signal_new ("delete_from_cursor",
                    GTK_RUN_LAST | GTK_RUN_ACTION,
                    GTK_CLASS_TYPE (object_class),
                    GTK_SIGNAL_OFFSET (GtkTextViewClass, delete_from_cursor),
                    gtk_marshal_VOID__ENUM_INT,
                    GTK_TYPE_NONE, 2, GTK_TYPE_DELETE_TYPE, GTK_TYPE_INT);

  signals[CUT_CLIPBOARD] =
    gtk_signal_new ("cut_clipboard",
                    GTK_RUN_LAST | GTK_RUN_ACTION,
                    GTK_CLASS_TYPE (object_class),
                    GTK_SIGNAL_OFFSET (GtkTextViewClass, cut_clipboard),
                    gtk_marshal_VOID__VOID,
                    GTK_TYPE_NONE, 0);

  signals[COPY_CLIPBOARD] =
    gtk_signal_new ("copy_clipboard",
                    GTK_RUN_LAST | GTK_RUN_ACTION,
                    GTK_CLASS_TYPE (object_class),
                    GTK_SIGNAL_OFFSET (GtkTextViewClass, copy_clipboard),
                    gtk_marshal_VOID__VOID,
                    GTK_TYPE_NONE, 0);

  signals[PASTE_CLIPBOARD] =
    gtk_signal_new ("paste_clipboard",
                    GTK_RUN_LAST | GTK_RUN_ACTION,
                    GTK_CLASS_TYPE (object_class),
                    GTK_SIGNAL_OFFSET (GtkTextViewClass, paste_clipboard),
                    gtk_marshal_VOID__VOID,
                    GTK_TYPE_NONE, 0);

  signals[TOGGLE_OVERWRITE] =
    gtk_signal_new ("toggle_overwrite",
                    GTK_RUN_LAST | GTK_RUN_ACTION,
                    GTK_CLASS_TYPE (object_class),
                    GTK_SIGNAL_OFFSET (GtkTextViewClass, toggle_overwrite),
                    gtk_marshal_VOID__VOID,
                    GTK_TYPE_NONE, 0);

  signals[SET_SCROLL_ADJUSTMENTS] = widget_class->set_scroll_adjustments_signal =
    gtk_signal_new ("set_scroll_adjustments",
                    GTK_RUN_LAST,
                    GTK_CLASS_TYPE (object_class),
                    GTK_SIGNAL_OFFSET (GtkTextViewClass, set_scroll_adjustments),
                    gtk_marshal_VOID__POINTER_POINTER,
                    GTK_TYPE_NONE, 2, GTK_TYPE_ADJUSTMENT, GTK_TYPE_ADJUSTMENT);

  gtk_object_class_add_signals (object_class, signals, LAST_SIGNAL);

  /*
   * Key bindings
   */

  binding_set = gtk_binding_set_by_class (klass);

  /* Moving the insertion point */
  add_move_binding (binding_set, GDK_Right, 0,
                    GTK_MOVEMENT_POSITIONS, 1);

  add_move_binding (binding_set, GDK_Left, 0,
                    GTK_MOVEMENT_POSITIONS, -1);

  add_move_binding (binding_set, GDK_f, GDK_CONTROL_MASK,
                    GTK_MOVEMENT_CHARS, 1);

  add_move_binding (binding_set, GDK_b, GDK_CONTROL_MASK,
                    GTK_MOVEMENT_CHARS, -1);

  add_move_binding (binding_set, GDK_Right, GDK_CONTROL_MASK,
                    GTK_MOVEMENT_WORDS, 1);

  add_move_binding (binding_set, GDK_Left, GDK_CONTROL_MASK,
                    GTK_MOVEMENT_WORDS, -1);

  /* Eventually we want to move by display lines, not paragraphs */
  add_move_binding (binding_set, GDK_Up, 0,
                    GTK_MOVEMENT_DISPLAY_LINES, -1);

  add_move_binding (binding_set, GDK_Down, 0,
                    GTK_MOVEMENT_DISPLAY_LINES, 1);

  add_move_binding (binding_set, GDK_p, GDK_CONTROL_MASK,
                    GTK_MOVEMENT_DISPLAY_LINES, -1);

  add_move_binding (binding_set, GDK_n, GDK_CONTROL_MASK,
                    GTK_MOVEMENT_DISPLAY_LINES, 1);

  add_move_binding (binding_set, GDK_a, GDK_CONTROL_MASK,
                    GTK_MOVEMENT_PARAGRAPH_ENDS, -1);

  add_move_binding (binding_set, GDK_e, GDK_CONTROL_MASK,
                    GTK_MOVEMENT_PARAGRAPH_ENDS, 1);

  add_move_binding (binding_set, GDK_f, GDK_MOD1_MASK,
                    GTK_MOVEMENT_WORDS, 1);

  add_move_binding (binding_set, GDK_b, GDK_MOD1_MASK,
                    GTK_MOVEMENT_WORDS, -1);

  add_move_binding (binding_set, GDK_Home, 0,
                    GTK_MOVEMENT_DISPLAY_LINE_ENDS, -1);

  add_move_binding (binding_set, GDK_End, 0,
                    GTK_MOVEMENT_DISPLAY_LINE_ENDS, 1);

  add_move_binding (binding_set, GDK_Home, GDK_CONTROL_MASK,
                    GTK_MOVEMENT_BUFFER_ENDS, -1);

  add_move_binding (binding_set, GDK_End, GDK_CONTROL_MASK,
                    GTK_MOVEMENT_BUFFER_ENDS, 1);

  add_move_binding (binding_set, GDK_Page_Up, 0,
                    GTK_MOVEMENT_PAGES, -1);

  add_move_binding (binding_set, GDK_Page_Down, 0,
                    GTK_MOVEMENT_PAGES, 1);


  /* Setting the cut/paste/copy anchor */
  gtk_binding_entry_add_signal (binding_set, GDK_space, GDK_CONTROL_MASK,
                                "set_anchor", 0);

  /* Deleting text */
  gtk_binding_entry_add_signal (binding_set, GDK_Delete, 0,
                                "delete_from_cursor", 2,
                                GTK_TYPE_ENUM, GTK_DELETE_CHARS,
                                GTK_TYPE_INT, 1);

  gtk_binding_entry_add_signal (binding_set, GDK_d, GDK_CONTROL_MASK,
                                "delete_from_cursor", 2,
                                GTK_TYPE_ENUM, GTK_DELETE_CHARS,
                                GTK_TYPE_INT, 1);

  gtk_binding_entry_add_signal (binding_set, GDK_BackSpace, 0,
                                "delete_from_cursor", 2,
                                GTK_TYPE_ENUM, GTK_DELETE_CHARS,
                                GTK_TYPE_INT, -1);

  gtk_binding_entry_add_signal (binding_set, GDK_Delete, GDK_CONTROL_MASK,
                                "delete_from_cursor", 2,
                                GTK_TYPE_ENUM, GTK_DELETE_WORD_ENDS,
                                GTK_TYPE_INT, 1);

  gtk_binding_entry_add_signal (binding_set, GDK_d, GDK_MOD1_MASK,
                                "delete_from_cursor", 2,
                                GTK_TYPE_ENUM, GTK_DELETE_WORD_ENDS,
                                GTK_TYPE_INT, 1);

  gtk_binding_entry_add_signal (binding_set, GDK_BackSpace, GDK_CONTROL_MASK,
                                "delete_from_cursor", 2,
                                GTK_TYPE_ENUM, GTK_DELETE_WORD_ENDS,
                                GTK_TYPE_INT, -1);

  gtk_binding_entry_add_signal (binding_set, GDK_k, GDK_CONTROL_MASK,
                                "delete_from_cursor", 2,
                                GTK_TYPE_ENUM, GTK_DELETE_PARAGRAPH_ENDS,
                                GTK_TYPE_INT, 1);

  gtk_binding_entry_add_signal (binding_set, GDK_u, GDK_CONTROL_MASK,
                                "delete_from_cursor", 2,
                                GTK_TYPE_ENUM, GTK_DELETE_PARAGRAPHS,
                                GTK_TYPE_INT, 1);

  gtk_binding_entry_add_signal (binding_set, GDK_space, GDK_MOD1_MASK,
                                "delete_from_cursor", 2,
                                GTK_TYPE_ENUM, GTK_DELETE_WHITESPACE,
                                GTK_TYPE_INT, 1);
  gtk_binding_entry_add_signal (binding_set, GDK_space, GDK_MOD1_MASK,
                                "insert_at_cursor", 1,
                                GTK_TYPE_STRING, " ");

  gtk_binding_entry_add_signal (binding_set, GDK_backslash, GDK_MOD1_MASK,
                                "delete_from_cursor", 2,
                                GTK_TYPE_ENUM, GTK_DELETE_WHITESPACE,
                                GTK_TYPE_INT, 1);

  /* Cut/copy/paste */

  gtk_binding_entry_add_signal (binding_set, GDK_x, GDK_CONTROL_MASK,
                                "cut_clipboard", 0);

  gtk_binding_entry_add_signal (binding_set, GDK_w, GDK_CONTROL_MASK,
                                "cut_clipboard", 0);

  gtk_binding_entry_add_signal (binding_set, GDK_c, GDK_CONTROL_MASK,
                                "copy_clipboard", 0);

  gtk_binding_entry_add_signal (binding_set, GDK_v, GDK_CONTROL_MASK,
                                "paste_clipboard", 0);

  gtk_binding_entry_add_signal (binding_set, GDK_y, GDK_CONTROL_MASK,
                                "paste_clipboard", 0);

  /* Overwrite */
  gtk_binding_entry_add_signal (binding_set, GDK_Insert, 0,
                                "toggle_overwrite", 0);

  /*
   * Default handlers and virtual methods
   */
  object_class->set_arg = gtk_text_view_set_arg;
  object_class->get_arg = gtk_text_view_get_arg;

  object_class->destroy = gtk_text_view_destroy;
  gobject_class->finalize = gtk_text_view_finalize;

  widget_class->realize = gtk_text_view_realize;
  widget_class->unrealize = gtk_text_view_unrealize;
  widget_class->style_set = gtk_text_view_style_set;
  widget_class->direction_changed = gtk_text_view_direction_changed;
  widget_class->size_request = gtk_text_view_size_request;
  widget_class->size_allocate = gtk_text_view_size_allocate;
  widget_class->event = gtk_text_view_event;
  widget_class->key_press_event = gtk_text_view_key_press_event;
  widget_class->key_release_event = gtk_text_view_key_release_event;
  widget_class->button_press_event = gtk_text_view_button_press_event;
  widget_class->button_release_event = gtk_text_view_button_release_event;
  widget_class->focus_in_event = gtk_text_view_focus_in_event;
  widget_class->focus_out_event = gtk_text_view_focus_out_event;
  widget_class->motion_notify_event = gtk_text_view_motion_event;
  widget_class->expose_event = gtk_text_view_expose_event;
  widget_class->draw = gtk_text_view_draw;
  widget_class->draw_focus = gtk_text_view_draw_focus;

  widget_class->drag_begin = gtk_text_view_drag_begin;
  widget_class->drag_end = gtk_text_view_drag_end;
  widget_class->drag_data_get = gtk_text_view_drag_data_get;
  widget_class->drag_data_delete = gtk_text_view_drag_data_delete;

  widget_class->drag_leave = gtk_text_view_drag_leave;
  widget_class->drag_motion = gtk_text_view_drag_motion;
  widget_class->drag_drop = gtk_text_view_drag_drop;
  widget_class->drag_data_received = gtk_text_view_drag_data_received;

  container_class->add = gtk_text_view_add;
  container_class->remove = gtk_text_view_remove;
  container_class->forall = gtk_text_view_forall;

  klass->move_cursor = gtk_text_view_move_cursor;
  klass->set_anchor = gtk_text_view_set_anchor;
  klass->insert_at_cursor = gtk_text_view_insert_at_cursor;
  klass->delete_from_cursor = gtk_text_view_delete_from_cursor;
  klass->cut_clipboard = gtk_text_view_cut_clipboard;
  klass->copy_clipboard = gtk_text_view_copy_clipboard;
  klass->paste_clipboard = gtk_text_view_paste_clipboard;
  klass->toggle_overwrite = gtk_text_view_toggle_overwrite;
  klass->set_scroll_adjustments = gtk_text_view_set_scroll_adjustments;
}

void
gtk_text_view_init (GtkTextView *text_view)
{
  GtkWidget *widget;

  widget = GTK_WIDGET (text_view);

  GTK_WIDGET_SET_FLAGS (widget, GTK_CAN_FOCUS);

  text_view->wrap_mode = GTK_WRAPMODE_NONE;

  gtk_drag_dest_set (widget,
                     GTK_DEST_DEFAULT_DROP,
                     target_table, G_N_ELEMENTS (target_table),
                     GDK_ACTION_COPY | GDK_ACTION_MOVE);

  text_view->virtual_cursor_x = -1;
  text_view->virtual_cursor_y = -1;

  /* This object is completely private. No external entity can gain a reference
   * to it; so we create it here and destroy it in finalize ().
   */
  text_view->im_context = gtk_im_multicontext_new ();

  gtk_signal_connect (GTK_OBJECT (text_view->im_context), "commit",
                      GTK_SIGNAL_FUNC (gtk_text_view_commit_handler), text_view);

  gtk_signal_connect (GTK_OBJECT (text_view->im_context), "preedit_changed",
 		      GTK_SIGNAL_FUNC (gtk_text_view_preedit_changed_handler), text_view);
  
  text_view->editable = TRUE;
  text_view->cursor_visible = TRUE;

  text_view->text_window = text_window_new (GTK_TEXT_WINDOW_TEXT,
                                            widget, 200, 200);

  text_view->drag_start_x = -1;
  text_view->drag_start_y = -1;
}

/**
 * gtk_text_view_new:
 * 
 * Creates a new #GtkTextView. If you don't call gtk_text_view_set_buffer()
 * before using the text view, an empty default buffer will be created
 * for you. Get the buffer with gtk_text_view_get_buffer(). If you want
 * to specify your own buffer, consider gtk_text_view_new_with_buffer().
 *
 * Return value: a new #GtkTextView
 **/
GtkWidget*
gtk_text_view_new (void)
{
  return GTK_WIDGET (gtk_type_new (gtk_text_view_get_type ()));
}

/**
 * gtk_text_view_new_with_buffer:
 * @buffer: a #GtkTextBuffer
 * 
 * Creates a new #GtkTextView widget displaying the buffer
 * @buffer. One buffer can be shared among many widgets.
 * @buffer may be NULL to create a default buffer, in which case
 * this function is equivalent to gtk_text_view_new(). The
 * text view adds its own reference count to the buffer; it does not
 * take over an existing reference.
 * 
 * Return value: a new #GtkTextView.
 **/
GtkWidget*
gtk_text_view_new_with_buffer (GtkTextBuffer *buffer)
{
  GtkTextView *text_view;

  text_view = (GtkTextView*)gtk_text_view_new ();

  gtk_text_view_set_buffer (text_view, buffer);

  return GTK_WIDGET (text_view);
}

/**
 * gtk_text_view_set_buffer:
 * @text_view: a #GtkTextView
 * @buffer: a #GtkTextBuffer
 *
 * Sets @buffer as the buffer being displayed by @text_view. The previous
 * buffer displayed by the text view is unreferenced, and a reference is
 * added to @buffer. If you owned a reference to @buffer before passing it
 * to this function, you must remove that reference yourself; #GtkTextView
 * will not "adopt" it.
 * 
 **/
void
gtk_text_view_set_buffer (GtkTextView   *text_view,
                          GtkTextBuffer *buffer)
{
  g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));
  g_return_if_fail (buffer == NULL || GTK_IS_TEXT_BUFFER (buffer));

  if (text_view->buffer == buffer)
    return;

  if (text_view->buffer != NULL)
    {
      /* Destroy all anchored children */
      GSList *tmp_list;
      GSList *copy;
      
      copy = g_slist_copy (text_view->children);
      tmp_list = copy;
      while (tmp_list != NULL)
        {
          GtkTextViewChild *vc = tmp_list->data;

          if (vc->anchor)
            {
              gtk_widget_destroy (vc->widget);
              /* vc may now be invalid! */
            }
            
          tmp_list = g_slist_next (tmp_list);
        }

      g_slist_free (copy);
      
      gtk_signal_disconnect_by_func (GTK_OBJECT (text_view->buffer),
                                     gtk_text_view_mark_set_handler, text_view);
      gtk_object_unref (GTK_OBJECT (text_view->buffer));
      text_view->dnd_mark = NULL;
    }

  text_view->buffer = buffer;

  if (buffer != NULL)
    {
      GtkTextIter start;

      gtk_object_ref (GTK_OBJECT (buffer));
      gtk_object_sink (GTK_OBJECT (buffer));

      if (text_view->layout)
        gtk_text_layout_set_buffer (text_view->layout, buffer);

      gtk_text_buffer_get_iter_at_offset (text_view->buffer, &start, 0);

      text_view->dnd_mark = gtk_text_buffer_create_mark (text_view->buffer,
                                                         "gtk_drag_target",
                                                         &start, FALSE);

      text_view->first_para_mark = gtk_text_buffer_create_mark (text_view->buffer,
                                                                NULL,
                                                                &start, TRUE);

      text_view->first_para_pixels = 0;

      gtk_signal_connect (GTK_OBJECT (text_view->buffer), "mark_set",
                          gtk_text_view_mark_set_handler, text_view);
    }

  if (GTK_WIDGET_VISIBLE (text_view))
    gtk_widget_queue_draw (GTK_WIDGET (text_view));
}

static GtkTextBuffer*
get_buffer (GtkTextView *text_view)
{
  if (text_view->buffer == NULL)
    {
      GtkTextBuffer *b;
      b = gtk_text_buffer_new (NULL);
      gtk_text_view_set_buffer (text_view, b);
      g_object_unref (G_OBJECT (b));
    }

  return text_view->buffer;
}

/**
 * gtk_text_view_get_buffer:
 * @text_view: a #GtkTextView
 * 
 * Returns the #GtkTextBuffer being displayed by this text view.
 * The reference count on the buffer is not incremented; the caller
 * of this function won't own a new reference.
 * 
 * Return value: a #GtkTextBuffer
 **/
GtkTextBuffer*
gtk_text_view_get_buffer (GtkTextView *text_view)
{
  g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), NULL);

  return get_buffer (text_view);
}

/**
 * gtk_text_view_get_iter_at_location:
 * @text_view: a #GtkTextView
 * @iter: a #GtkTextIter
 * @x: x position, in buffer coordinates
 * @y: y position, in buffer coordinates
 *
 * Retrieves the iterator at buffer coordinates @x and @y. Buffer
 * coordinates are coordinates for the entire buffer, not just the
 * currently-displayed portion.  If you have coordinates from an
 * event, you have to convert those to buffer coordinates with
 * gtk_text_view_window_to_buffer_coords().
 * 
 **/
void
gtk_text_view_get_iter_at_location (GtkTextView *text_view,
                                    GtkTextIter *iter,
                                    gint         x,
                                    gint         y)
{
  g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));
  g_return_if_fail (iter != NULL);
  g_return_if_fail (text_view->layout != NULL);

  gtk_text_layout_get_iter_at_pixel (text_view->layout,
                                     iter,
                                     x,
                                     y);
}

/**
 * gtk_text_view_get_iter_location:
 * @text_view: a #GtkTextView
 * @iter: a #GtkTextIter
 * @location: bounds of the character at @iter
 *
 * Gets a rectangle which roughly contains the character at @iter.
 * The rectangle position is in buffer coordinates; use
 * gtk_text_view_buffer_to_window_coords() to convert these
 * coordinates to coordinates for one of the windows in the text view.
 * 
 **/
void
gtk_text_view_get_iter_location (GtkTextView       *text_view,
                                 const GtkTextIter *iter,
                                 GdkRectangle      *location)
{
  g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));
  g_return_if_fail (gtk_text_iter_get_buffer (iter) == get_buffer (text_view));

  gtk_text_layout_get_iter_location (text_view->layout, iter, location);
}

/**
 * gtk_text_view_get_line_yrange:
 * @text_view: a #GtkTextView
 * @iter: a #GtkTextIter
 * @y: return location for a y coordinate
 * @height: return location for a height
 *
 * Gets the y coordinate of the top of the line containing @iter,
 * and the height of the line. The coordinate is a buffer coordinate;
 * convert to window coordinates with gtk_text_view_buffer_to_window_coords().
 * 
 **/
void
gtk_text_view_get_line_yrange (GtkTextView       *text_view,
                               const GtkTextIter *iter,
                               gint              *y,
                               gint              *height)
{
  g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));
  g_return_if_fail (gtk_text_iter_get_buffer (iter) == get_buffer (text_view));

  gtk_text_layout_get_line_yrange (text_view->layout,
                                   iter,
                                   y,
                                   height);
}

/**
 * gtk_text_view_get_line_at_y:
 * @text_view: a #GtkTextView
 * @target_iter: a #GtkTextIter
 * @y: a y coordinate
 * @line_top: return location for top coordinate of the line
 * 
 * Gets the #GtkTextIter at the start of the line containing
 * the coordinate @y. @y is in buffer coordinates, convert from
 * window coordinates with gtk_text_view_window_to_buffer_coords().
 * If non-%NULL, @line_top will be filled with the coordinate of the top
 * edge of the line.
 **/
void
gtk_text_view_get_line_at_y (GtkTextView *text_view,
                             GtkTextIter *target_iter,
                             gint         y,
                             gint        *line_top)
{
  g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));

  gtk_text_layout_get_line_at_y (text_view->layout,
                                 target_iter,
                                 y,
                                 line_top);
}

static void
set_adjustment_clamped (GtkAdjustment *adj, gfloat val)
{
  /* We don't really want to clamp to upper; we want to clamp to
     upper - page_size which is the highest value the scrollbar
     will let us reach. */
  if (val > (adj->upper - adj->page_size))
    val = adj->upper - adj->page_size;

  if (val < adj->lower)
    val = adj->lower;

  gtk_adjustment_set_value (adj, val);
}

static gboolean
gtk_text_view_scroll_to_mark_adjusted (GtkTextView *text_view,
                                       GtkTextMark *mark,
                                       gint margin,
                                       gfloat percentage)
{
  GtkTextIter iter;
  GdkRectangle rect;
  GdkRectangle screen;
  gint screen_bottom;
  gint screen_right;
  GtkWidget *widget;
  gboolean retval = FALSE;
  gint scroll_inc;

  gint current_x_scroll, current_y_scroll;

  g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), FALSE);
  g_return_val_if_fail (mark != NULL, FALSE);

  widget = GTK_WIDGET (text_view);

  if (!GTK_WIDGET_MAPPED (widget))
    {
      g_warning ("FIXME need to implement scroll_to_mark for unmapped GtkTextView?");
      return FALSE;
    }

  gtk_text_buffer_get_iter_at_mark (get_buffer (text_view), &iter, mark);

  gtk_text_layout_get_iter_location (text_view->layout,
                                     &iter,
                                     &rect);

  /* Be sure the scroll region is up-to-date */
  gtk_text_view_scroll_calc_now (text_view);

  current_x_scroll = text_view->xoffset;
  current_y_scroll = text_view->yoffset;

  screen.x = current_x_scroll;
  screen.y = current_y_scroll;
  screen.width = SCREEN_WIDTH (widget);
  screen.height = SCREEN_HEIGHT (widget);

  {
    /* Clamp margin so it's not too large. */
    gint small_dimension = MIN (screen.width, screen.height);
    gint max_rect_dim;

    if (margin > (small_dimension/2 - 5)) /* 5 is arbitrary */
      margin = (small_dimension/2 - 5);

    if (margin < 0)
      margin = 0;

    /* make sure rectangle fits in the leftover space */

    max_rect_dim = MAX (rect.width, rect.height);

    if (max_rect_dim > (small_dimension - margin*2))
      margin -= max_rect_dim - (small_dimension - margin*2);

    if (margin < 0)
      margin = 0;
  }

  g_assert (margin >= 0);

  screen.x += margin;
  screen.y += margin;

  screen.width -= margin*2;
  screen.height -= margin*2;

  screen_bottom = screen.y + screen.height;
  screen_right = screen.x + screen.width;

  /* Vertical scroll (only vertical gets adjusted) */

  scroll_inc = 0;
  if (rect.y < screen.y)
    {
      gint scroll_dest = rect.y;
      scroll_inc = (scroll_dest - screen.y) * percentage;
    }
  else if ((rect.y + rect.height) > screen_bottom)
    {
      gint scroll_dest = rect.y + rect.height;
      scroll_inc = (scroll_dest - screen_bottom) * percentage;
    }

  if (scroll_inc != 0)
    {
      set_adjustment_clamped (get_vadjustment (text_view),
                              current_y_scroll + scroll_inc);
      retval = TRUE;
    }

  /* Horizontal scroll */

  scroll_inc = 0;
  if (rect.x < screen.x)
    {
      gint scroll_dest = rect.x;
      scroll_inc = scroll_dest - screen.x;
    }
  else if ((rect.x + rect.width) > screen_right)
    {
      gint scroll_dest = rect.x + rect.width;
      scroll_inc = scroll_dest - screen_right;
    }

  if (scroll_inc != 0)
    {
      set_adjustment_clamped (get_hadjustment (text_view),
                              current_x_scroll + scroll_inc);
      retval = TRUE;
    }

  return retval;
}

/**
 * gtk_text_view_scroll_to_mark:
 * @text_view: a #GtkTextView
 * @mark: a #GtkTextMark
 * @mark_within_margin: a margin
 * 
 * Scrolls @text_view so that @mark is on the screen. If
 * @mark_within_margin is nonzero, the mark will be moved onscreen by
 * that many pixels. For example, if @mark_within_margin is 5, the
 * mark will be at least 5 pixels away from the edge of the screen,
 * if possible.
 * 
 * Return value: TRUE if scrolling occurred
 **/
gboolean
gtk_text_view_scroll_to_mark (GtkTextView *text_view,
                              GtkTextMark *mark,
                              gint mark_within_margin)
{
  g_return_val_if_fail (mark_within_margin >= 0, FALSE);

  return gtk_text_view_scroll_to_mark_adjusted (text_view, mark,
                                                mark_within_margin, 1.0);
}

static gboolean
clamp_iter_onscreen (GtkTextView *text_view, GtkTextIter *iter)
{
  GdkRectangle visible_rect;
  gtk_text_view_get_visible_rect (text_view, &visible_rect);

  return gtk_text_layout_clamp_iter_to_vrange (text_view->layout, iter,
                                               visible_rect.y,
                                               visible_rect.y + visible_rect.height);
}

/**
 * gtk_text_view_move_mark_onscreen:
 * @text_view: a #GtkTextView
 * @mark: a #GtkTextMark
 * 
 * Moves a mark within the buffer so that it's
 * located within the currently-visible text area.
 * 
 * Return value: %TRUE if scrolling occurred
 **/
gboolean
gtk_text_view_move_mark_onscreen (GtkTextView *text_view,
                                  GtkTextMark *mark)
{
  GtkTextIter iter;

  g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), FALSE);
  g_return_val_if_fail (mark != NULL, FALSE);

  gtk_text_buffer_get_iter_at_mark (get_buffer (text_view), &iter, mark);

  if (clamp_iter_onscreen (text_view, &iter))
    {
      gtk_text_buffer_move_mark (get_buffer (text_view), mark, &iter);
      return TRUE;
    }
  else
    return FALSE;
}

/**
 * gtk_text_view_get_visible_rect:
 * @text_view: a #GtkTextView
 * @visible_rect: rectangle to fill
 * 
 * Fills @visible_rect with the currently-visible
 * region of the buffer, in buffer coordinates. Convert to window coordinates
 * with gtk_text_view_buffer_to_window_coords().
 **/
void
gtk_text_view_get_visible_rect (GtkTextView  *text_view,
                                GdkRectangle *visible_rect)
{
  GtkWidget *widget;

  g_return_if_fail (text_view != NULL);
  g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));

  widget = GTK_WIDGET (text_view);

  if (visible_rect)
    {
      visible_rect->x = text_view->xoffset;
      visible_rect->y = text_view->yoffset;
      visible_rect->width = SCREEN_WIDTH (widget);
      visible_rect->height = SCREEN_HEIGHT (widget);
    }
}

/**
 * gtk_text_view_set_wrap_mode:
 * @text_view: a #GtkTextView
 * @wrap_mode: a #GtkWrapMode
 * 
 * Sets the line wrapping for the view.
 **/
void
gtk_text_view_set_wrap_mode (GtkTextView *text_view,
                             GtkWrapMode  wrap_mode)
{
  g_return_if_fail (text_view != NULL);
  g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));

  if (text_view->wrap_mode != wrap_mode)
    {
      text_view->wrap_mode = wrap_mode;

      if (text_view->layout)
        {
          text_view->layout->default_style->wrap_mode = wrap_mode;
          gtk_text_layout_default_style_changed (text_view->layout);
        }
    }
}

/**
 * gtk_text_view_get_wrap_mode:
 * @text_view: a #GtkTextView
 * 
 * Gets the line wrapping for the view.
 * 
 * Return value: the line wrap setting
 **/
GtkWrapMode
gtk_text_view_get_wrap_mode (GtkTextView *text_view)
{
  g_return_val_if_fail (text_view != NULL, GTK_WRAPMODE_NONE);
  g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), GTK_WRAPMODE_NONE);

  return text_view->wrap_mode;
}

/**
 * gtk_text_view_set_editable:
 * @text_view: a #GtkTextView
 * @setting: whether it's editable
 * 
 * Sets the default editability of the #GtkTextView. You can override
 * this default setting with tags in the buffer, using the "editable"
 * attribute of tags.
 **/
void
gtk_text_view_set_editable (GtkTextView *text_view,
                            gboolean     setting)
{
  g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));

  if (text_view->editable != setting)
    {
      text_view->editable = setting;

      if (text_view->layout)
        {
          text_view->layout->default_style->editable = text_view->editable;
          gtk_text_layout_default_style_changed (text_view->layout);
        }
    }
}

/**
 * gtk_text_view_get_editable:
 * @text_view: a #GtkTextView
 * 
 * Returns the default editability of the #GtkTextView. Tags in the
 * buffer may override this setting for some ranges of text.
 * 
 * Return value: whether text is editable by default
 **/
gboolean
gtk_text_view_get_editable (GtkTextView *text_view)
{
  g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), FALSE);

  return text_view->editable;
}

/**
 * gtk_text_view_set_cursor_visible:
 * @text_view: a #GtkTextView
 * @setting: whether to show the insertion cursor
 * 
 * Toggles whether the insertion point is displayed. A buffer with no editable
 * text probably shouldn't have a visible cursor, so you may want to turn
 * the cursor off.
 **/
void
gtk_text_view_set_cursor_visible    (GtkTextView   *text_view,
                                     gboolean       setting)
{
  g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));

  setting = (setting != FALSE);

  if (text_view->cursor_visible != setting)
    {
      text_view->cursor_visible = setting;

      if (GTK_WIDGET_HAS_FOCUS (text_view))
        {
          if (text_view->layout)
            {
              gtk_text_layout_set_cursor_visible (text_view->layout, setting);

              if (setting)
                gtk_text_view_start_cursor_blink (text_view);
              else
                gtk_text_view_stop_cursor_blink (text_view);
            }
        }
    }
}

/**
 * gtk_text_view_get_cursor_visible:
 * @text_view: a #GtkTextView
 * 
 * Find out whether the cursor is being displayed.
 * 
 * Return value: whether the insertion mark is visible
 **/
gboolean
gtk_text_view_get_cursor_visible    (GtkTextView   *text_view)
{
  g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), FALSE);

  return text_view->cursor_visible;
}


/**
 * gtk_text_view_place_cursor_onscreen:
 * @text_view: a #GtkTextView
 * 
 * Moves the cursor to the currently visible region of the
 * buffer, it it isn't there already.
 * 
 * Return value: TRUE if the cursor had to be moved.
 **/
gboolean
gtk_text_view_place_cursor_onscreen (GtkTextView *text_view)
{
  GtkTextIter insert;

  g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), FALSE);

  gtk_text_buffer_get_iter_at_mark (get_buffer (text_view), &insert,
                                    gtk_text_buffer_get_mark (get_buffer (text_view),
                                                              "insert"));

  if (clamp_iter_onscreen (text_view, &insert))
    {
      gtk_text_buffer_place_cursor (get_buffer (text_view), &insert);
      return TRUE;
    }
  else
    return FALSE;
}

static void
gtk_text_view_destroy (GtkObject *object)
{
  GtkTextView *text_view;

  text_view = GTK_TEXT_VIEW (object);

  gtk_text_view_destroy_layout (text_view);
  gtk_text_view_set_buffer (text_view, NULL);

  (* GTK_OBJECT_CLASS (parent_class)->destroy) (object);
}

static void
gtk_text_view_finalize (GObject *object)
{
  GtkTextView *text_view;

  text_view = GTK_TEXT_VIEW (object);

  g_return_if_fail (text_view->buffer == NULL);
  
  if (text_view->hadjustment)
    gtk_object_unref (GTK_OBJECT (text_view->hadjustment));
  if (text_view->vadjustment)
    gtk_object_unref (GTK_OBJECT (text_view->vadjustment));

  text_window_free (text_view->text_window);

  if (text_view->left_window)
    text_window_free (text_view->left_window);

  if (text_view->top_window)
    text_window_free (text_view->top_window);

  if (text_view->right_window)
    text_window_free (text_view->right_window);

  if (text_view->bottom_window)
    text_window_free (text_view->bottom_window);

  gtk_object_unref (GTK_OBJECT (text_view->im_context));

  (* G_OBJECT_CLASS (parent_class)->finalize) (object);
}

static void
gtk_text_view_set_arg (GtkObject *object, GtkArg *arg, guint arg_id)
{
  GtkTextView *text_view;

  text_view = GTK_TEXT_VIEW (object);

  switch (arg_id)
    {
    case ARG_HEIGHT_LINES:
      break;

    case ARG_WIDTH_COLUMNS:
      break;

    case ARG_PIXELS_ABOVE_LINES:
      break;

    case ARG_PIXELS_BELOW_LINES:
      break;

    case ARG_PIXELS_INSIDE_WRAP:
      break;

    case ARG_EDITABLE:
      break;

    case ARG_WRAP_MODE:
      break;

    default:
      g_assert_not_reached ();
      break;
    }
}

static void
gtk_text_view_get_arg (GtkObject *object, GtkArg *arg, guint arg_id)
{
  GtkTextView *text_view;

  text_view = GTK_TEXT_VIEW (object);

  switch (arg_id)
    {
    case ARG_HEIGHT_LINES:
      break;

    case ARG_WIDTH_COLUMNS:
      break;

    case ARG_PIXELS_ABOVE_LINES:
      break;

    case ARG_PIXELS_BELOW_LINES:
      break;

    case ARG_PIXELS_INSIDE_WRAP:
      break;

    case ARG_EDITABLE:
      break;

    case ARG_WRAP_MODE:
      break;

    default:
      arg->type = GTK_TYPE_INVALID;
      break;
    }
}

static void
gtk_text_view_size_request (GtkWidget      *widget,
                            GtkRequisition *requisition)
{
  GtkTextView *text_view;
  GSList *tmp_list;
  
  text_view = GTK_TEXT_VIEW (widget);

  requisition->width = text_view->text_window->requisition.width + FOCUS_EDGE_WIDTH * 2;
  requisition->height = text_view->text_window->requisition.height + FOCUS_EDGE_WIDTH * 2;

  if (text_view->left_window)
    requisition->width += text_view->left_window->requisition.width;

  if (text_view->right_window)
    requisition->width += text_view->right_window->requisition.width;

  if (text_view->top_window)
    requisition->height += text_view->top_window->requisition.height;

  if (text_view->bottom_window)
    requisition->height += text_view->bottom_window->requisition.height;

  tmp_list = text_view->children;
  while (tmp_list != NULL)
    {
      GtkTextViewChild *child = tmp_list->data;

      if (child->anchor)
        {
          GtkRequisition child_req;
          GtkRequisition old_req;
          
          old_req = child->widget->requisition;

          gtk_widget_size_request (child->widget, &child_req); 
          
          if (text_view->layout &&
              (old_req.width != child_req.width ||
               old_req.height != child_req.height))
            gtk_text_child_anchor_queue_resize (child->anchor,
                                                text_view->layout);
        }
      else
        {

        }
          
      tmp_list = g_slist_next (tmp_list);
    }
}

static void
gtk_text_view_allocate_children (GtkTextView *text_view)
{
  GSList *tmp_list;

  return;
  
  tmp_list = text_view->children;
  while (tmp_list != NULL)
    {
      GtkTextViewChild *child = tmp_list->data;

      if (child->anchor)
        {
          /* We need to force-validate the regions containing
           * children.
           */
          GtkTextIter child_loc;
          gtk_text_buffer_get_iter_at_child_anchor (get_buffer (text_view),
                                                    &child_loc,
                                                    child->anchor);

          gtk_text_layout_validate_yrange (text_view->layout,
                                           &child_loc,
                                           0, 1);
        }
      else
        {
          
        }
          
      tmp_list = g_slist_next (tmp_list);
    }
}

static void
gtk_text_view_size_allocate (GtkWidget *widget,
                             GtkAllocation *allocation)
{
  GtkTextView *text_view;
  GtkTextIter first_para;
  gint y;
  GtkAdjustment *vadj;
  gboolean yoffset_changed = FALSE;
  gint width, height;
  GdkRectangle text_rect;
  GdkRectangle left_rect;
  GdkRectangle right_rect;
  GdkRectangle top_rect;
  GdkRectangle bottom_rect;
  
  text_view = GTK_TEXT_VIEW (widget);

  widget->allocation = *allocation;

  if (GTK_WIDGET_REALIZED (widget))
    {
      gdk_window_move_resize (widget->window,
                              allocation->x, allocation->y,
                              allocation->width, allocation->height);
    }

  /* distribute width/height among child windows. Ensure all
   * windows get at least a 1x1 allocation.
   */

  width = allocation->width - FOCUS_EDGE_WIDTH * 2;

  if (text_view->left_window)
    left_rect.width = text_view->left_window->requisition.width;
  else
    left_rect.width = 1;

  width -= left_rect.width;

  if (text_view->right_window)
    right_rect.width = text_view->right_window->requisition.width;
  else
    right_rect.width = 1;

  width -= right_rect.width;

  text_rect.width = MAX (1, width);

  top_rect.width = text_rect.width;
  bottom_rect.width = text_rect.width;


  height = allocation->height - FOCUS_EDGE_WIDTH * 2;

  if (text_view->top_window)
    top_rect.height = text_view->top_window->requisition.height;
  else
    top_rect.height = 1;

  height -= top_rect.height;

  if (text_view->bottom_window)
    bottom_rect.height = text_view->bottom_window->requisition.height;
  else
    bottom_rect.height = 1;

  height -= bottom_rect.height;

  text_rect.height = MAX (1, height);

  left_rect.height = text_rect.height;
  right_rect.height = text_rect.height;

  /* Origins */
  left_rect.x = FOCUS_EDGE_WIDTH;
  top_rect.y = FOCUS_EDGE_WIDTH;

  text_rect.x = left_rect.x + left_rect.width;
  text_rect.y = top_rect.y + top_rect.height;

  left_rect.y = text_rect.y;
  right_rect.y = text_rect.y;

  top_rect.x = text_rect.x;
  bottom_rect.x = text_rect.x;

  right_rect.x = text_rect.x + text_rect.width;
  bottom_rect.y = text_rect.y + text_rect.height;

  text_window_size_allocate (text_view->text_window,
                             &text_rect);

  if (text_view->left_window)
    text_window_size_allocate (text_view->left_window,
                               &left_rect);

  if (text_view->right_window)
    text_window_size_allocate (text_view->right_window,
                               &right_rect);

  if (text_view->top_window)
    text_window_size_allocate (text_view->top_window,
                               &top_rect);

  if (text_view->bottom_window)
    text_window_size_allocate (text_view->bottom_window,
                               &bottom_rect);

  gtk_text_view_ensure_layout (text_view);
  gtk_text_layout_set_screen_width (text_view->layout,
                                    SCREEN_WIDTH (text_view));

  gtk_text_view_allocate_children (text_view);
  
  gtk_text_view_validate_onscreen (text_view);
  gtk_text_view_scroll_calc_now (text_view);

  /* Now adjust the value of the adjustment to keep the cursor at the
   * same place in the buffer
   */
  gtk_text_view_get_first_para_iter (text_view, &first_para);
  gtk_text_layout_get_line_yrange (text_view->layout, &first_para, &y, NULL);

  y += text_view->first_para_pixels;

  /* Ensure h/v adj exist */
  get_hadjustment (text_view);
  get_vadjustment (text_view);

  vadj = text_view->vadjustment;
  if (y > vadj->upper - vadj->page_size)
    y = MAX (0, vadj->upper - vadj->page_size);

  if (y != text_view->yoffset)
    {
      vadj->value = text_view->yoffset = y;
      yoffset_changed = TRUE;
    }

  text_view->hadjustment->page_size = SCREEN_WIDTH (text_view);
  text_view->hadjustment->page_increment = SCREEN_WIDTH (text_view) / 2;
  text_view->hadjustment->lower = 0;
  text_view->hadjustment->upper = MAX (SCREEN_WIDTH (text_view),
                                       text_view->width);
  gtk_signal_emit_by_name (GTK_OBJECT (text_view->hadjustment), "changed");

  text_view->vadjustment->page_size = SCREEN_HEIGHT (text_view);
  text_view->vadjustment->page_increment = SCREEN_HEIGHT (text_view) / 2;
  text_view->vadjustment->lower = 0;
  text_view->vadjustment->upper = MAX (SCREEN_HEIGHT (text_view),
                                       text_view->height);
  gtk_signal_emit_by_name (GTK_OBJECT (text_view->vadjustment), "changed");

  if (yoffset_changed)
    gtk_adjustment_value_changed (vadj);
}

static void
gtk_text_view_get_first_para_iter (GtkTextView *text_view,
                                   GtkTextIter *iter)
{
  gtk_text_buffer_get_iter_at_mark (get_buffer (text_view), iter,
                                    text_view->first_para_mark);
}

static void
gtk_text_view_validate_onscreen (GtkTextView *text_view)
{
  GtkWidget *widget = GTK_WIDGET (text_view);

  if (SCREEN_HEIGHT (widget) > 0)
    {
      GtkTextIter first_para;
      gtk_text_view_get_first_para_iter (text_view, &first_para);
      gtk_text_layout_validate_yrange (text_view->layout,
                                       &first_para,
                                       0,
                                       text_view->first_para_pixels +
                                       SCREEN_HEIGHT (widget));
    }
}

static gboolean
first_validate_callback (gpointer data)
{
  GtkTextView *text_view = data;

  gtk_text_view_validate_onscreen (text_view);

  text_view->first_validate_idle = 0;
  return FALSE;
}

static gboolean
incremental_validate_callback (gpointer data)
{
  GtkTextView *text_view = data;

  gtk_text_layout_validate (text_view->layout, 2000);
  if (gtk_text_layout_is_valid (text_view->layout))
    {
      text_view->incremental_validate_idle = 0;
      return FALSE;
    }
  else
    return TRUE;
}

static void
invalidated_handler (GtkTextLayout *layout,
                     gpointer       data)
{
  GtkTextView *text_view;

  text_view = GTK_TEXT_VIEW (data);

  if (!text_view->first_validate_idle)
    text_view->first_validate_idle = g_idle_add_full (GTK_PRIORITY_RESIZE - 1, first_validate_callback, text_view, NULL);

  if (!text_view->incremental_validate_idle)
    text_view->incremental_validate_idle = g_idle_add_full (GDK_PRIORITY_REDRAW + 1, incremental_validate_callback, text_view, NULL);
}

static void
changed_handler (GtkTextLayout *layout,
                 gint           start_y,
                 gint           old_height,
                 gint           new_height,
                 gpointer       data)
{
  GtkTextView *text_view;
  GtkWidget *widget;
  GdkRectangle visible_rect;
  GdkRectangle redraw_rect;

  text_view = GTK_TEXT_VIEW (data);
  widget = GTK_WIDGET (data);

  if (GTK_WIDGET_REALIZED (text_view))
    {
      gtk_text_view_get_visible_rect (text_view, &visible_rect);

      redraw_rect.x = visible_rect.x;
      redraw_rect.width = visible_rect.width;
      redraw_rect.y = start_y;

      if (old_height == new_height)
        redraw_rect.height = old_height;
      else
        redraw_rect.height = MAX (0, visible_rect.y + visible_rect.height - start_y);

      if (gdk_rectangle_intersect (&redraw_rect, &visible_rect, &redraw_rect))
        {
          redraw_rect.y -= text_view->yoffset;
          text_window_invalidate_rect (text_view->text_window,
                                       &redraw_rect);
        }
    }

  if (old_height != new_height)
    {
      gboolean yoffset_changed = FALSE;

      if (start_y + old_height <= text_view->yoffset - text_view->first_para_pixels)
        {
          text_view->yoffset += new_height - old_height;
          get_vadjustment (text_view)->value = text_view->yoffset;
          yoffset_changed = TRUE;
        }

      gtk_text_view_scroll_calc_now (text_view);

      if (yoffset_changed)
        gtk_adjustment_value_changed (get_vadjustment (text_view));
    }
}

static void
gtk_text_view_realize (GtkWidget *widget)
{
  GtkTextView *text_view;
  GdkWindowAttr attributes;
  gint attributes_mask;

  text_view = GTK_TEXT_VIEW (widget);
  GTK_WIDGET_SET_FLAGS (text_view, GTK_REALIZED);

  attributes.window_type = GDK_WINDOW_CHILD;
  attributes.x = widget->allocation.x;
  attributes.y = widget->allocation.y;
  attributes.width = widget->allocation.width;
  attributes.height = widget->allocation.height;
  attributes.wclass = GDK_INPUT_OUTPUT;
  attributes.visual = gtk_widget_get_visual (widget);
  attributes.colormap = gtk_widget_get_colormap (widget);
  attributes.event_mask = GDK_VISIBILITY_NOTIFY_MASK | GDK_EXPOSURE_MASK;

  attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;

  widget->window = gdk_window_new (gtk_widget_get_parent_window (widget),
                                   &attributes, attributes_mask);
  gdk_window_set_user_data (widget->window, widget);

  /* must come before text_window_realize calls */
  widget->style = gtk_style_attach (widget->style, widget->window);

  gdk_window_set_background (widget->window,
                             &widget->style->bg[GTK_WIDGET_STATE (widget)]);

  text_window_realize (text_view->text_window, widget->window);

  if (text_view->left_window)
    text_window_realize (text_view->left_window,
                         widget->window);

  if (text_view->top_window)
    text_window_realize (text_view->top_window,
                         widget->window);

  if (text_view->right_window)
    text_window_realize (text_view->right_window,
                         widget->window);

  if (text_view->bottom_window)
    text_window_realize (text_view->bottom_window,
                         widget->window);

  gtk_text_view_ensure_layout (text_view);
}

static void
gtk_text_view_unrealize (GtkWidget *widget)
{
  GtkTextView *text_view;
  
  text_view = GTK_TEXT_VIEW (widget);

  if (text_view->first_validate_idle)
    {
      g_source_remove (text_view->first_validate_idle);
      text_view->first_validate_idle = 0;
    }

  if (text_view->incremental_validate_idle)
    {
      g_source_remove (text_view->incremental_validate_idle);
      text_view->incremental_validate_idle = 0;
    }
  
  if (text_view->popup_menu)
    {
      gtk_widget_destroy (text_view->popup_menu);
      text_view->popup_menu = NULL;
    }
   
  text_window_unrealize (text_view->text_window);

  if (text_view->left_window)
    text_window_unrealize (text_view->left_window);

  if (text_view->top_window)
    text_window_unrealize (text_view->top_window);

  if (text_view->right_window)
    text_window_unrealize (text_view->right_window);

  if (text_view->bottom_window)
    text_window_unrealize (text_view->bottom_window);

  gtk_text_view_destroy_layout (text_view);

  (* GTK_WIDGET_CLASS (parent_class)->unrealize) (widget);
}

static void
gtk_text_view_style_set (GtkWidget *widget,
                         GtkStyle  *previous_style)
{
  GtkTextView *text_view = GTK_TEXT_VIEW (widget);

  if (GTK_WIDGET_REALIZED (widget))
    {
      gdk_window_set_background (widget->window,
                                 &widget->style->bg[GTK_WIDGET_STATE (widget)]);

      gdk_window_set_background (text_view->text_window->bin_window,
                                 &widget->style->base[GTK_WIDGET_STATE (widget)]);

      if (text_view->left_window)
        gdk_window_set_background (text_view->left_window->bin_window,
                                   &widget->style->bg[GTK_WIDGET_STATE (widget)]);
      if (text_view->right_window)
        gdk_window_set_background (text_view->right_window->bin_window,
                                   &widget->style->bg[GTK_WIDGET_STATE (widget)]);

      if (text_view->top_window)
        gdk_window_set_background (text_view->top_window->bin_window,
                                   &widget->style->bg[GTK_WIDGET_STATE (widget)]);

      if (text_view->bottom_window)
        gdk_window_set_background (text_view->bottom_window->bin_window,
                                   &widget->style->bg[GTK_WIDGET_STATE (widget)]);

      gtk_text_view_set_attributes_from_style (text_view,
                                               text_view->layout->default_style,
                                               widget->style);
      gtk_text_layout_default_style_changed (text_view->layout);
    }
}

static void
gtk_text_view_direction_changed (GtkWidget        *widget,
                                 GtkTextDirection  previous_direction)
{
  GtkTextView *text_view = GTK_TEXT_VIEW (widget);

  if (text_view->layout)
    {
      text_view->layout->default_style->direction = gtk_widget_get_direction (widget);
      gtk_text_layout_default_style_changed (text_view->layout);
    }
}

/*
 * Events
 */

static gboolean
get_event_coordinates (GdkEvent *event, gint *x, gint *y)
{
  if (event)
    switch (event->type)
      {
      case GDK_MOTION_NOTIFY:
        *x = event->motion.x;
        *y = event->motion.y;
        return TRUE;
        break;

      case GDK_BUTTON_PRESS:
      case GDK_2BUTTON_PRESS:
      case GDK_3BUTTON_PRESS:
      case GDK_BUTTON_RELEASE:
        *x = event->button.x;
        *y = event->button.y;
        return TRUE;
        break;

      case GDK_KEY_PRESS:
      case GDK_KEY_RELEASE:
      case GDK_ENTER_NOTIFY:
      case GDK_LEAVE_NOTIFY:
      case GDK_PROPERTY_NOTIFY:
      case GDK_SELECTION_CLEAR:
      case GDK_SELECTION_REQUEST:
      case GDK_SELECTION_NOTIFY:
      case GDK_PROXIMITY_IN:
      case GDK_PROXIMITY_OUT:
      case GDK_DRAG_ENTER:
      case GDK_DRAG_LEAVE:
      case GDK_DRAG_MOTION:
      case GDK_DRAG_STATUS:
      case GDK_DROP_START:
      case GDK_DROP_FINISHED:
      default:
        return FALSE;
        break;
      }

  return FALSE;
}

static gint
emit_event_on_tags (GtkWidget   *widget,
                    GdkEvent    *event,
                    GtkTextIter *iter)
{
  GSList *tags;
  GSList *tmp;
  gint retval = FALSE;
  GtkTextView *text_view;

  text_view = GTK_TEXT_VIEW (widget);

  tags = gtk_text_iter_get_tags (iter);

  tmp = tags;
  while (tmp != NULL)
    {
      GtkTextTag *tag = tmp->data;

      if (gtk_text_tag_event (tag, G_OBJECT (widget), event, iter))
        {
          retval = TRUE;
          break;
        }

      tmp = g_slist_next (tmp);
    }

  g_slist_free (tags);

  return retval;
}

static gint
gtk_text_view_event (GtkWidget *widget, GdkEvent *event)
{
  GtkTextView *text_view;
  gint x = 0, y = 0;

  text_view = GTK_TEXT_VIEW (widget);

  if (text_view->layout == NULL ||
      get_buffer (text_view) == NULL)
    return FALSE;

  if (event->any.window != text_view->text_window->bin_window)
    return FALSE;

  if (get_event_coordinates (event, &x, &y))
    {
      GtkTextIter iter;

      x += text_view->xoffset;
      y += text_view->yoffset;

      /* FIXME this is slow and we do it twice per event.
         My favorite solution is to have GtkTextLayout cache
         the last couple lookups. */
      gtk_text_layout_get_iter_at_pixel (text_view->layout,
                                         &iter,
                                         x, y);

      return emit_event_on_tags (widget, event, &iter);
    }
  else if (event->type == GDK_KEY_PRESS ||
           event->type == GDK_KEY_RELEASE)
    {
      GtkTextMark *insert;
      GtkTextIter iter;

      insert = gtk_text_buffer_get_mark (get_buffer (text_view),
                                         "insert");

      gtk_text_buffer_get_iter_at_mark (get_buffer (text_view), &iter, insert);

      return emit_event_on_tags (widget, event, &iter);
    }
  else
    return FALSE;
}

static gint
gtk_text_view_key_press_event (GtkWidget *widget, GdkEventKey *event)
{
  GtkTextView *text_view;

  text_view = GTK_TEXT_VIEW (widget);

  if (text_view->layout == NULL ||
      get_buffer (text_view) == NULL)
    return FALSE;

  if (gtk_im_context_filter_keypress (text_view->im_context, event))
    {
      text_view->need_im_reset = TRUE;
      return TRUE;
    }
  else if (GTK_WIDGET_CLASS (parent_class)->key_press_event &&
 	   GTK_WIDGET_CLASS (parent_class)->key_press_event (widget, event))
    return TRUE;
  else if (event->keyval == GDK_Return)
    {
      gtk_text_buffer_insert_interactive_at_cursor (get_buffer (text_view), "\n", 1,
                                                    text_view->editable);
      gtk_text_view_scroll_to_mark (text_view,
                                    gtk_text_buffer_get_mark (get_buffer (text_view),
                                                              "insert"),
                                    0);
      return TRUE;
    }
  /* Pass through Tab as literal tab, unless Control is held down */
  else if (event->keyval == GDK_Tab && !(event->state & GDK_CONTROL_MASK))
    {
      gtk_text_buffer_insert_interactive_at_cursor (get_buffer (text_view), "\t", 1,
                                                    text_view->editable);
      gtk_text_view_scroll_to_mark (text_view,
                                    gtk_text_buffer_get_mark (get_buffer (text_view),
                                                              "insert"),
                                    0);
      return TRUE;
    }
  else
    return FALSE;
}

static gint
gtk_text_view_key_release_event (GtkWidget *widget, GdkEventKey *event)
{
  return FALSE;
}

static gint
gtk_text_view_button_press_event (GtkWidget *widget, GdkEventButton *event)
{
  GtkTextView *text_view;

  text_view = GTK_TEXT_VIEW (widget);

  gtk_widget_grab_focus (widget);

  if (event->window != text_view->text_window->bin_window)
    {
      /* Remove selection if any. */
      gtk_text_view_unselect (text_view);
      return FALSE;
    }

#if 0
  /* debug hack */
  if (event->button == 3 && (event->state & GDK_CONTROL_MASK) != 0)
    _gtk_text_buffer_spew (GTK_TEXT_VIEW (widget)->buffer);
  else if (event->button == 3)
    gtk_text_layout_spew (GTK_TEXT_VIEW (widget)->layout);
#endif

  if (event->type == GDK_BUTTON_PRESS)
    {
      gtk_text_view_reset_im_context (text_view);
   
      if (event->button == 1)
        {
          /* If we're in the selection, start a drag copy/move of the
           * selection; otherwise, start creating a new selection.
           */
          GtkTextIter iter;
          GtkTextIter start, end;

          gtk_text_layout_get_iter_at_pixel (text_view->layout,
                                             &iter,
                                             event->x + text_view->xoffset,
                                             event->y + text_view->yoffset);

          if (gtk_text_buffer_get_selection_bounds (get_buffer (text_view),
                                                    &start, &end) &&
              gtk_text_iter_in_range (&iter, &start, &end))
            {
              text_view->drag_start_x = event->x;
              text_view->drag_start_y = event->y;
            }
          else
            {
              gtk_text_view_start_selection_drag (text_view, &iter, event);
            }

          return TRUE;
        }
      else if (event->button == 2)
        {
          GtkTextIter iter;

          gtk_text_layout_get_iter_at_pixel (text_view->layout,
                                             &iter,
                                             event->x + text_view->xoffset,
                                             event->y + text_view->yoffset);

          gtk_text_buffer_paste_primary (get_buffer (text_view),
                                         &iter,
                                         text_view->editable);
          return TRUE;
        }
      else if (event->button == 3)
        {
	  gtk_text_view_popup_menu (text_view, event);
        }
    }

  return FALSE;
}

static gint
gtk_text_view_button_release_event (GtkWidget *widget, GdkEventButton *event)
{
  GtkTextView *text_view;

  text_view = GTK_TEXT_VIEW (widget);

  if (event->window != text_view->text_window->bin_window)
    return FALSE;

  if (event->button == 1)
    {
      if (text_view->drag_start_x >= 0)
        {
          text_view->drag_start_x = -1;
          text_view->drag_start_y = -1;
        }

      if (gtk_text_view_end_selection_drag (GTK_TEXT_VIEW (widget), event))
        return TRUE;
      else
        {
          /* Unselect everything; probably we were dragging, or clicked
           * outside the text.
           */
          gtk_text_view_unselect (text_view);
          return FALSE;
        }
    }

  return FALSE;
}

static gint
gtk_text_view_focus_in_event (GtkWidget *widget, GdkEventFocus *event)
{
  GtkTextView *text_view = GTK_TEXT_VIEW (widget);

  GTK_WIDGET_SET_FLAGS (widget, GTK_HAS_FOCUS);
  gtk_widget_draw_focus (widget);

  if (text_view->cursor_visible && text_view->layout)
    {
      gtk_text_layout_set_cursor_visible (text_view->layout, TRUE);
      gtk_text_view_start_cursor_blink (text_view);
    }

  text_view->need_im_reset = TRUE;
  gtk_im_context_focus_in (GTK_TEXT_VIEW (widget)->im_context);

  return FALSE;
}

static gint
gtk_text_view_focus_out_event (GtkWidget *widget, GdkEventFocus *event)
{
  GtkTextView *text_view = GTK_TEXT_VIEW (widget);

  GTK_WIDGET_UNSET_FLAGS (widget, GTK_HAS_FOCUS);
  gtk_widget_draw_focus (widget);

  if (text_view->cursor_visible && text_view->layout)
    {
      gtk_text_layout_set_cursor_visible (text_view->layout, FALSE);
      gtk_text_view_stop_cursor_blink (text_view);
    }

  text_view->need_im_reset = TRUE;
  gtk_im_context_focus_out (GTK_TEXT_VIEW (widget)->im_context);

  return FALSE;
}

static gint
gtk_text_view_motion_event (GtkWidget *widget, GdkEventMotion *event)
{
  GtkTextView *text_view = GTK_TEXT_VIEW (widget);

  if (event->window == text_view->text_window->bin_window &&
      text_view->drag_start_x >= 0)
    {
      gint x, y;
      gint dx, dy;

      gdk_window_get_pointer (text_view->text_window->bin_window,
                              &x, &y, NULL);

      dx = text_view->drag_start_x - x;
      dy = text_view->drag_start_y - y;

      if (ABS (dx) > DRAG_THRESHOLD ||
          ABS (dy) > DRAG_THRESHOLD)
        {
          GtkTextIter iter;
          gint buffer_x, buffer_y;

          gtk_text_view_window_to_buffer_coords (text_view,
                                                 GTK_TEXT_WINDOW_TEXT,
                                                 text_view->drag_start_x,
                                                 text_view->drag_start_y,
                                                 &buffer_x,
                                                 &buffer_y);

          gtk_text_layout_get_iter_at_pixel (text_view->layout,
                                             &iter,
                                             buffer_x, buffer_y);

          gtk_text_view_start_selection_dnd (text_view, &iter, event);
          return TRUE;
        }
    }

  return FALSE;
}

static void
gtk_text_view_paint (GtkWidget *widget, GdkRectangle *area)
{
  GtkTextView *text_view;

  text_view = GTK_TEXT_VIEW (widget);

  g_return_if_fail (text_view->layout != NULL);
  g_return_if_fail (text_view->xoffset >= 0);
  g_return_if_fail (text_view->yoffset >= 0);

  gtk_text_view_validate_onscreen (text_view);

#if 0
  printf ("painting %d,%d  %d x %d\n",
          area->x, area->y,
          area->width, area->height);
#endif

  gtk_text_layout_draw (text_view->layout,
                        widget,
                        text_view->text_window->bin_window,
                        text_view->xoffset,
                        text_view->yoffset,
                        area->x, area->y,
                        area->width, area->height);
}

static void
send_expose (GtkTextView   *text_view,
             GtkTextWindow *win,
             GdkRectangle  *area)
{
  GdkEventExpose event;

  event.type = GDK_EXPOSE;
  event.send_event = TRUE;
  event.window = win->bin_window;
  event.area = *area;
  event.count = 0;

  /* Fix coordinates (convert widget coords to window coords) */
  gtk_text_view_window_to_buffer_coords (text_view,
                                         GTK_TEXT_WINDOW_WIDGET,
                                         event.area.x,
                                         event.area.y,
                                         &event.area.x,
                                         &event.area.y);

  gtk_text_view_buffer_to_window_coords (text_view,
                                         win->type,
                                         event.area.x,
                                         event.area.y,
                                         &event.area.x,
                                         &event.area.y);


  gdk_window_ref (event.window);
  gtk_widget_event (GTK_WIDGET (text_view), (GdkEvent*) &event);
  gdk_window_unref (event.window);
}

static void
gtk_text_view_draw (GtkWidget *widget, GdkRectangle *area)
{
  GdkRectangle intersection;
  GtkTextView *text_view;

  text_view = GTK_TEXT_VIEW (widget);

  gtk_text_view_paint (widget, area);

  /* If the area overlaps the "edge" of the widget, draw the focus
   * rectangle
   */
  if (area->x < FOCUS_EDGE_WIDTH ||
      area->y < FOCUS_EDGE_WIDTH ||
      (area->x + area->width) > (widget->allocation.width - FOCUS_EDGE_WIDTH) ||
      (area->y + area->height) > (widget->allocation.height - FOCUS_EDGE_WIDTH))
    gtk_widget_draw_focus (widget);

  /* Synthesize expose events for the user-drawn border windows,
   * just as we would for a drawing area.
   */

  if (text_view->left_window &&
      gdk_rectangle_intersect (area, &text_view->left_window->allocation,
                               &intersection))
    send_expose (text_view, text_view->left_window, &intersection);

  if (text_view->right_window &&
      gdk_rectangle_intersect (area, &text_view->right_window->allocation,
                               &intersection))
    send_expose (text_view, text_view->right_window, &intersection);

  if (text_view->top_window &&
      gdk_rectangle_intersect (area, &text_view->top_window->allocation,
                               &intersection))
    send_expose (text_view, text_view->top_window, &intersection);

  if (text_view->bottom_window &&
      gdk_rectangle_intersect (area, &text_view->bottom_window->allocation,
                               &intersection))
    send_expose (text_view, text_view->bottom_window, &intersection);
}

static gint
gtk_text_view_expose_event (GtkWidget *widget, GdkEventExpose *event)
{
  if (event->window == gtk_text_view_get_window (GTK_TEXT_VIEW (widget),
                                                 GTK_TEXT_WINDOW_TEXT))
    gtk_text_view_paint (widget, &event->area);

  if (event->window == widget->window)
    gtk_widget_draw_focus (widget);

  return TRUE;
}

static void
gtk_text_view_draw_focus (GtkWidget *widget)
{
  if (GTK_WIDGET_DRAWABLE (widget))
    {
      if (GTK_WIDGET_HAS_FOCUS (widget))
        {
          gtk_paint_focus (widget->style, widget->window,
                           NULL, widget, "textview",
                           0, 0,
                           widget->allocation.width - 1,
                           widget->allocation.height - 1);
        }
      else
        {
          gdk_window_clear (widget->window);
        }
    }
}

/*
 * Container
 */

static void
gtk_text_view_add (GtkContainer *container,
                   GtkWidget    *child)
{
  g_return_if_fail (GTK_IS_TEXT_VIEW (container));
  g_return_if_fail (GTK_IS_WIDGET (child));

  /* This is pretty random. */
  gtk_text_view_add_child_in_window (GTK_TEXT_VIEW (container),
                                     child,
                                     GTK_TEXT_WINDOW_WIDGET,
                                     0, 0);
}

static void
gtk_text_view_remove (GtkContainer *container,
                      GtkWidget    *child)
{
  GSList *iter;
  GtkTextView *text_view;
  GtkTextViewChild *vc;

  g_return_if_fail (GTK_IS_TEXT_VIEW (container));
  g_return_if_fail (GTK_IS_WIDGET (child));
  g_return_if_fail (child->parent == (GtkWidget*) container);

  text_view = GTK_TEXT_VIEW (container);

  vc = NULL;
  iter = text_view->children;

  while (iter != NULL)
    {
      vc = iter->data;

      if (vc->widget == child)
        break;

      iter = g_slist_next (iter);
    }

  g_assert (iter != NULL); /* be sure we had the child in the list */
  
  text_view->children = g_slist_remove (text_view->children, vc);

  gtk_widget_unparent (vc->widget);

  text_view_child_free (vc);
}

static void
gtk_text_view_forall (GtkContainer *container,
                      gboolean      include_internals,
                      GtkCallback   callback,
                      gpointer      callback_data)
{
  GSList *iter;
  GtkTextView *text_view;

  g_return_if_fail (GTK_IS_TEXT_VIEW (container));
  g_return_if_fail (callback != NULL);

  text_view = GTK_TEXT_VIEW (container);

  iter = text_view->children;

  while (iter != NULL)
    {
      GtkTextViewChild *vc = iter->data;

      (* callback) (vc->widget, callback_data);

      iter = g_slist_next (iter);
    }
}

/*
 * Blink!
 */

static gint
blink_cb (gpointer data)
{
  GtkTextView *text_view;

  text_view = GTK_TEXT_VIEW (data);

  g_assert (text_view->layout && GTK_WIDGET_HAS_FOCUS (text_view) && text_view->cursor_visible);

  gtk_text_layout_set_cursor_visible (text_view->layout,
                                      !gtk_text_layout_get_cursor_visible (text_view->layout));
  return TRUE;
}

static void
gtk_text_view_start_cursor_blink (GtkTextView *text_view)
{
  if (text_view->blink_timeout != 0)
    return;

  text_view->blink_timeout = gtk_timeout_add (500, blink_cb, text_view);
}

static void
gtk_text_view_stop_cursor_blink (GtkTextView *text_view)
{
  if (text_view->blink_timeout == 0)
    return;

  gtk_timeout_remove (text_view->blink_timeout);
  text_view->blink_timeout = 0;
}

/*
 * Key binding handlers
 */

static void
gtk_text_view_move_iter_by_lines (GtkTextView *text_view,
                                  GtkTextIter *newplace,
                                  gint         count)
{
  while (count < 0)
    {
      gtk_text_layout_move_iter_to_previous_line (text_view->layout, newplace);
      count++;
    }

  while (count > 0)
    {
      gtk_text_layout_move_iter_to_next_line (text_view->layout, newplace);
      count--;
    }
}

static void
gtk_text_view_move_cursor (GtkTextView     *text_view,
                           GtkMovementStep  step,
                           gint             count,
                           gboolean         extend_selection)
{
  GtkTextIter insert;
  GtkTextIter newplace;

  gint cursor_x_pos = 0;

  gtk_text_view_reset_im_context (text_view);
   
  if (step == GTK_MOVEMENT_PAGES)
    {
      gtk_text_view_scroll_pages (text_view, count);
      return;
    }

  gtk_text_buffer_get_iter_at_mark (get_buffer (text_view), &insert,
                                    gtk_text_buffer_get_mark (get_buffer (text_view),
                                                              "insert"));
  newplace = insert;

  if (step == GTK_MOVEMENT_DISPLAY_LINES)
    gtk_text_view_get_virtual_cursor_pos (text_view, &cursor_x_pos, NULL);

  switch (step)
    {
    case GTK_MOVEMENT_CHARS:
      gtk_text_iter_forward_chars (&newplace, count);
      break;

    case GTK_MOVEMENT_POSITIONS:
      gtk_text_layout_move_iter_visually (text_view->layout,
                                          &newplace, count);
      break;

    case GTK_MOVEMENT_WORDS:
      if (count < 0)
        gtk_text_iter_backward_word_starts (&newplace, -count);
      else if (count > 0)
        gtk_text_iter_forward_word_ends (&newplace, count);
      break;

    case GTK_MOVEMENT_DISPLAY_LINES:
      gtk_text_view_move_iter_by_lines (text_view, &newplace, count);
      gtk_text_layout_move_iter_to_x (text_view->layout, &newplace, cursor_x_pos);
      break;

    case GTK_MOVEMENT_DISPLAY_LINE_ENDS:
      if (count > 1)
        gtk_text_view_move_iter_by_lines (text_view, &newplace, --count);
      else if (count < -1)
        gtk_text_view_move_iter_by_lines (text_view, &newplace, ++count);

      if (count != 0)
        gtk_text_layout_move_iter_to_line_end (text_view->layout, &newplace, count);
      break;

    case GTK_MOVEMENT_PARAGRAPHS:
      /* This should almost certainly instead be doing the parallel thing to WORD */
      /*       gtk_text_iter_down_lines (&newplace, count); */
      /* FIXME */
      break;

    case GTK_MOVEMENT_PARAGRAPH_ENDS:
      if (count > 0)
        gtk_text_iter_forward_to_newline (&newplace);
      else if (count < 0)
        gtk_text_iter_set_line_offset (&newplace, 0);
      break;

    case GTK_MOVEMENT_BUFFER_ENDS:
      if (count > 0)
        gtk_text_buffer_get_last_iter (get_buffer (text_view), &newplace);
      else if (count < 0)
        gtk_text_buffer_get_iter_at_offset (get_buffer (text_view), &newplace, 0);
      break;

    default:
      break;
    }

  if (!gtk_text_iter_equal (&insert, &newplace))
    {
      if (extend_selection)
        gtk_text_buffer_move_mark (get_buffer (text_view),
                                   gtk_text_buffer_get_mark (get_buffer (text_view),
                                                             "insert"),
                                   &newplace);
      else
        gtk_text_buffer_place_cursor (get_buffer (text_view), &newplace);

      gtk_text_view_scroll_to_mark (text_view,
                                    gtk_text_buffer_get_mark (get_buffer (text_view),
                                                              "insert"), 0);

      if (step == GTK_MOVEMENT_DISPLAY_LINES)
        {
          gtk_text_view_set_virtual_cursor_pos (text_view, cursor_x_pos, -1);
        }
    }
}

static void
gtk_text_view_set_anchor (GtkTextView *text_view)
{
  GtkTextIter insert;

  gtk_text_buffer_get_iter_at_mark (get_buffer (text_view), &insert,
                                    gtk_text_buffer_get_mark (get_buffer (text_view),
                                                              "insert"));

  gtk_text_buffer_create_mark (get_buffer (text_view), "anchor", &insert, TRUE);
}

static void
gtk_text_view_scroll_pages (GtkTextView *text_view,
                            gint         count)
{
  gfloat newval;
  GtkAdjustment *adj;
  gint cursor_x_pos, cursor_y_pos;
  GtkTextIter new_insert;
  GtkTextIter anchor;
  gint y0, y1;

  g_return_if_fail (text_view->vadjustment != NULL);

  adj = text_view->vadjustment;

  /* Validate the region that will be brought into view by the cursor motion
   */
  if (count < 0)
    {
      gtk_text_view_get_first_para_iter (text_view, &anchor);
      y0 = adj->page_size;
      y1 = adj->page_size + count * adj->page_increment;
    }
  else
    {
      gtk_text_view_get_first_para_iter (text_view, &anchor);
      y0 = count * adj->page_increment + adj->page_size;
      y1 = 0;
    }

  gtk_text_layout_validate_yrange (text_view->layout, &anchor, y0, y1);

  gtk_text_view_get_virtual_cursor_pos (text_view, &cursor_x_pos, &cursor_y_pos);

  newval = adj->value;

  newval += count * adj->page_increment;

  cursor_y_pos += newval - adj->value;
  set_adjustment_clamped (adj, newval);

  gtk_text_layout_get_iter_at_pixel (text_view->layout, &new_insert, cursor_x_pos, cursor_y_pos);
  clamp_iter_onscreen (text_view, &new_insert);
  gtk_text_buffer_place_cursor (get_buffer (text_view), &new_insert);

  gtk_text_view_set_virtual_cursor_pos (text_view, cursor_x_pos, cursor_y_pos);

  /* Adjust to have the cursor _entirely_ onscreen, move_mark_onscreen
   * only guarantees 1 pixel onscreen.
   */
  gtk_text_view_scroll_to_mark (text_view,
                                gtk_text_buffer_get_mark (get_buffer (text_view),
                                                          "insert"),
                                0);
}

static gboolean
whitespace (gunichar ch, gpointer user_data)
{
  return (ch == ' ' || ch == '\t');
}

static gboolean
not_whitespace (gunichar ch, gpointer user_data)
{
  return !whitespace (ch, user_data);
}

static gboolean
find_whitepace_region (const GtkTextIter *center,
                       GtkTextIter *start, GtkTextIter *end)
{
  *start = *center;
  *end = *center;

  if (gtk_text_iter_backward_find_char (start, not_whitespace, NULL, NULL))
    gtk_text_iter_next_char (start); /* we want the first whitespace... */
  if (whitespace (gtk_text_iter_get_char (end), NULL))
    gtk_text_iter_forward_find_char (end, not_whitespace, NULL, NULL);

  return !gtk_text_iter_equal (start, end);
}

static void
gtk_text_view_insert_at_cursor (GtkTextView *text_view,
                                const gchar *str)
{
  gtk_text_buffer_insert_interactive_at_cursor (get_buffer (text_view), str, -1,
                                                text_view->editable);
}

static void
gtk_text_view_delete_from_cursor (GtkTextView   *text_view,
                                GtkDeleteType  type,
                                gint           count)
{
  GtkTextIter insert;
  GtkTextIter start;
  GtkTextIter end;
  gboolean leave_one = FALSE;

  gtk_text_view_reset_im_context (text_view);
  
  if (type == GTK_DELETE_CHARS)
    {
      /* Char delete deletes the selection, if one exists */
      if (gtk_text_buffer_delete_selection (get_buffer (text_view), TRUE,
                                            text_view->editable))
        return;
    }

  gtk_text_buffer_get_iter_at_mark (get_buffer (text_view),
                                    &insert,
                                    gtk_text_buffer_get_mark (get_buffer (text_view),
                                                              "insert"));

  start = insert;
  end = insert;

  switch (type)
    {
    case GTK_DELETE_CHARS:
      gtk_text_iter_forward_chars (&end, count);
      break;

    case GTK_DELETE_WORD_ENDS:
      if (count > 0)
        gtk_text_iter_forward_word_ends (&end, count);
      else if (count < 0)
        gtk_text_iter_backward_word_starts (&start, 0 - count);
      break;

    case GTK_DELETE_WORDS:
      break;

    case GTK_DELETE_DISPLAY_LINE_ENDS:
      break;

    case GTK_DELETE_DISPLAY_LINES:
      break;

    case GTK_DELETE_PARAGRAPH_ENDS:
      /* If we're already at a newline, we need to
       * simply delete that newline, instead of
       * moving to the next one.
       */
      if (gtk_text_iter_get_char (&end) == '\n')
        {
          gtk_text_iter_next_char (&end);
          --count;
        }

      while (count > 0)
        {
          if (!gtk_text_iter_forward_to_newline (&end))
            break;

          --count;
        }

      /* FIXME figure out what a negative count means
         and support that */
      break;

    case GTK_DELETE_PARAGRAPHS:
      if (count > 0)
        {
          gtk_text_iter_set_line_offset (&start, 0);
          gtk_text_iter_forward_to_newline (&end);

          /* Do the lines beyond the first. */
          while (count > 1)
            {
              gtk_text_iter_forward_to_newline (&end);

              --count;
            }
        }

      /* FIXME negative count? */

      break;

    case GTK_DELETE_WHITESPACE:
      {
        find_whitepace_region (&insert, &start, &end);
      }
      break;

    default:
      break;
    }

  if (!gtk_text_iter_equal (&start, &end))
    {
      if (gtk_text_buffer_delete_interactive (get_buffer (text_view), &start, &end,
                                              text_view->editable))
        {
          if (leave_one)
            gtk_text_buffer_insert_interactive_at_cursor (get_buffer (text_view),
                                                          " ", 1,
                                                          text_view->editable);
        }

      gtk_text_view_scroll_to_mark (text_view,
                                    gtk_text_buffer_get_mark (get_buffer (text_view), "insert"),
                                    0);
    }
}

static void
gtk_text_view_cut_clipboard (GtkTextView *text_view)
{
  gtk_text_buffer_cut_clipboard (get_buffer (text_view), text_view->editable);
  gtk_text_view_scroll_to_mark (text_view,
                                gtk_text_buffer_get_mark (get_buffer (text_view),
                                                          "insert"),
                                0);
}

static void
gtk_text_view_copy_clipboard (GtkTextView *text_view)
{
  gtk_text_buffer_copy_clipboard (get_buffer (text_view));
  gtk_text_view_scroll_to_mark (text_view,
                                gtk_text_buffer_get_mark (get_buffer (text_view),
                                                          "insert"),
                                0);
}

static void
gtk_text_view_paste_clipboard (GtkTextView *text_view)
{
  gtk_text_buffer_paste_clipboard (get_buffer (text_view), text_view->editable);
  gtk_text_view_scroll_to_mark (text_view,
                                gtk_text_buffer_get_mark (get_buffer (text_view),
                                                          "insert"),
                                0);
}

static void
gtk_text_view_toggle_overwrite (GtkTextView *text_view)
{
  text_view->overwrite_mode = !text_view->overwrite_mode;
}

/*
 * Selections
 */

static void
gtk_text_view_unselect (GtkTextView *text_view)
{
  GtkTextIter insert;

  gtk_text_buffer_get_iter_at_mark (get_buffer (text_view),
                                    &insert,
                                    gtk_text_buffer_get_mark (get_buffer (text_view),
                                                              "insert"));

  gtk_text_buffer_move_mark (get_buffer (text_view),
                             gtk_text_buffer_get_mark (get_buffer (text_view),
                                                       "selection_bound"),
                             &insert);
}

static gboolean
move_insert_to_pointer_and_scroll (GtkTextView *text_view, gboolean partial_scroll)
{
  gint x, y;
  GdkModifierType state;
  GtkTextIter newplace;
  gint adjust = 0;
  gboolean in_threshold = FALSE;

  gdk_window_get_pointer (text_view->text_window->bin_window,
                          &x, &y, &state);

  /* Adjust movement by how long we've been selecting, to
     get an acceleration effect. The exact numbers are
     pretty arbitrary. We have a threshold before we
     start to accelerate. */
  /* uncommenting this printf helps visualize how it works. */
  /*   printf ("%d\n", text_view->scrolling_accel_factor); */

  if (text_view->scrolling_accel_factor > 10)
    adjust = (text_view->scrolling_accel_factor - 10) * 75;

  if (y < 0) /* scrolling upward */
    adjust = -adjust;

  /* No adjust if the pointer has moved back inside the window for sure.
     Also I'm adding a small threshold where no adjust is added,
     in case you want to do a continuous slow scroll. */
#define SLOW_SCROLL_TH 7
  if (x >= (0 - SLOW_SCROLL_TH) &&
      x < (SCREEN_WIDTH (text_view) + SLOW_SCROLL_TH) &&
      y >= (0 - SLOW_SCROLL_TH) &&
      y < (SCREEN_HEIGHT (text_view) + SLOW_SCROLL_TH))
    {
      adjust = 0;
      in_threshold = TRUE;
    }

  gtk_text_layout_get_iter_at_pixel (text_view->layout,
                                     &newplace,
                                     x + text_view->xoffset,
                                     y + text_view->yoffset + adjust);

  {
    gboolean scrolled = FALSE;
    GtkTextMark *insert_mark =
      gtk_text_buffer_get_mark (get_buffer (text_view), "insert");

    gtk_text_buffer_move_mark (get_buffer (text_view),
                               insert_mark,
                               &newplace);

    if (partial_scroll)
      scrolled = gtk_text_view_scroll_to_mark_adjusted (text_view, insert_mark, 0, 0.7);
    else
      scrolled = gtk_text_view_scroll_to_mark_adjusted (text_view, insert_mark, 0, 1.0);

    if (scrolled)
      {
        /* We want to avoid rapid jump to super-accelerated when you
           leave the slow scroll threshold after scrolling for a
           while. So we slowly decrease accel when scrolling inside
           the threshold.
        */
        if (in_threshold)
          {
            if (text_view->scrolling_accel_factor > 1)
              text_view->scrolling_accel_factor -= 2;
          }
        else
          text_view->scrolling_accel_factor += 1;
      }
    else
      {
        /* If we don't scroll we're probably inside the window, but
           potentially just a bit outside. We decrease acceleration
           while the user is fooling around inside the window.
           Acceleration decreases faster than it increases. */
        if (text_view->scrolling_accel_factor > 4)
          text_view->scrolling_accel_factor -= 5;
      }

    return scrolled;
  }
}

static gint
selection_scan_timeout (gpointer data)
{
  GtkTextView *text_view;

  text_view = GTK_TEXT_VIEW (data);

  if (move_insert_to_pointer_and_scroll (text_view, TRUE))
    {
      return TRUE; /* remain installed. */
    }
  else
    {
      text_view->selection_drag_scan_timeout = 0;
      return FALSE; /* remove ourselves */
    }
}

static gint
selection_motion_event_handler (GtkTextView *text_view, GdkEventMotion *event, gpointer data)
{
  if (move_insert_to_pointer_and_scroll (text_view, TRUE))
    {
      /* If we had to scroll offscreen, insert a timeout to do so
         again. Note that in the timeout, even if the mouse doesn't
         move, due to this scroll xoffset/yoffset will have changed
         and we'll need to scroll again. */
      if (text_view->selection_drag_scan_timeout != 0) /* reset on every motion event */
        gtk_timeout_remove (text_view->selection_drag_scan_timeout);

      text_view->selection_drag_scan_timeout =
        gtk_timeout_add (50, selection_scan_timeout, text_view);
    }

  return TRUE;
}

static void
gtk_text_view_start_selection_drag (GtkTextView       *text_view,
                                    const GtkTextIter *iter,
                                    GdkEventButton    *button)
{
  GtkTextIter newplace;

  g_return_if_fail (text_view->selection_drag_handler == 0);

  gtk_grab_add (GTK_WIDGET (text_view));

  text_view->scrolling_accel_factor = 0;

  newplace = *iter;

  gtk_text_buffer_place_cursor (get_buffer (text_view), &newplace);

  text_view->selection_drag_handler = gtk_signal_connect (GTK_OBJECT (text_view),
                                                          "motion_notify_event",
                                                          GTK_SIGNAL_FUNC (selection_motion_event_handler),
                                                          NULL);
}

/* returns whether we were really dragging */
static gboolean
gtk_text_view_end_selection_drag (GtkTextView *text_view, GdkEventButton *event)
{
  if (text_view->selection_drag_handler == 0)
    return FALSE;

  gtk_signal_disconnect (GTK_OBJECT (text_view), text_view->selection_drag_handler);
  text_view->selection_drag_handler = 0;

  text_view->scrolling_accel_factor = 0;

  if (text_view->selection_drag_scan_timeout != 0)
    {
      gtk_timeout_remove (text_view->selection_drag_scan_timeout);
      text_view->selection_drag_scan_timeout = 0;
    }

  /* one last update to current position */
  move_insert_to_pointer_and_scroll (text_view, FALSE);

  gtk_grab_remove (GTK_WIDGET (text_view));

  return TRUE;
}

/*
 * Layout utils
 */

static void
gtk_text_view_set_adjustment_upper (GtkAdjustment *adj, gfloat upper)
{
  if (upper != adj->upper)
    {
      gfloat min = MAX (0., upper - adj->page_size);
      gboolean value_changed = FALSE;

      adj->upper = upper;

      if (adj->value > min)
        {
          adj->value = min;
          value_changed = TRUE;
        }

      gtk_signal_emit_by_name (GTK_OBJECT (adj), "changed");
      if (value_changed)
        gtk_signal_emit_by_name (GTK_OBJECT (adj), "value_changed");
    }
}

static void
gtk_text_view_scroll_calc_now (GtkTextView *text_view)
{
  gint width = 0, height = 0;

  gtk_text_view_ensure_layout (text_view);


  gtk_text_layout_set_screen_width (text_view->layout,
                                    SCREEN_WIDTH (text_view));

  gtk_text_layout_get_size (text_view->layout, &width, &height);

#if 0
  /* If the width is less than the screen width (likely
     if we have wrapping turned on for the whole widget),
     then we want to set the scroll region to the screen
     width. If the width is greater (wrapping off) then we
     probably want to set the scroll region to the width
     of the layout. I guess.
  */

  width = MAX (text_view->layout->screen_width, width);
  height = height;
#endif

  if (text_view->width != width || text_view->height != height)
    {
#if 0
      printf ("layout size set, widget width is %d\n",
              GTK_WIDGET (text_view)->allocation.width);
#endif
      text_view->width = width;
      text_view->height = height;

      gtk_text_view_set_adjustment_upper (get_hadjustment (text_view),
                                          MAX (SCREEN_WIDTH (text_view), width));
      gtk_text_view_set_adjustment_upper (get_vadjustment (text_view),
                                          MAX (SCREEN_HEIGHT (text_view), height));

      /* hadj/vadj exist since we called get_hadjustment/get_vadjustment above */

      /* Set up the step sizes; we'll say that a page is
         our allocation minus one step, and a step is
         1/10 of our allocation. */
      text_view->hadjustment->step_increment =
        SCREEN_WIDTH (text_view) / 10.0;
      text_view->hadjustment->page_increment =
        SCREEN_WIDTH (text_view) * 0.9;

      text_view->vadjustment->step_increment =
        SCREEN_HEIGHT (text_view) / 10.0;
      text_view->vadjustment->page_increment =
        SCREEN_HEIGHT (text_view) * 0.9;
    }
}

static void
gtk_text_view_set_attributes_from_style (GtkTextView        *text_view,
                                         GtkTextAttributes *values,
                                         GtkStyle           *style)
{
  values->appearance.bg_color = style->base[GTK_STATE_NORMAL];
  values->appearance.fg_color = style->fg[GTK_STATE_NORMAL];

  if (values->font_desc)
    pango_font_description_free (values->font_desc);

  values->font_desc = pango_font_description_copy (style->font_desc);
}

static void
gtk_text_view_ensure_layout (GtkTextView *text_view)
{
  GtkWidget *widget;

  widget = GTK_WIDGET (text_view);

  if (text_view->layout == NULL)
    {
      GtkTextAttributes *style;
      PangoContext *ltr_context, *rtl_context;

      text_view->layout = gtk_text_layout_new ();

      gtk_signal_connect (GTK_OBJECT (text_view->layout),
                          "invalidated",
                          GTK_SIGNAL_FUNC (invalidated_handler),
                          text_view);

      gtk_signal_connect (GTK_OBJECT (text_view->layout),
                          "changed",
                          GTK_SIGNAL_FUNC (changed_handler),
                          text_view);

      if (get_buffer (text_view))
        gtk_text_layout_set_buffer (text_view->layout, get_buffer (text_view));

      if ((GTK_WIDGET_HAS_FOCUS (text_view) && text_view->cursor_visible))
        gtk_text_view_start_cursor_blink (text_view);
      else
        gtk_text_layout_set_cursor_visible (text_view->layout, FALSE);

      ltr_context = gtk_widget_create_pango_context (GTK_WIDGET (text_view));
      pango_context_set_base_dir (ltr_context, PANGO_DIRECTION_LTR);
      rtl_context = gtk_widget_create_pango_context (GTK_WIDGET (text_view));
      pango_context_set_base_dir (rtl_context, PANGO_DIRECTION_RTL);

      gtk_text_layout_set_contexts (text_view->layout, ltr_context, rtl_context);

      g_object_unref (G_OBJECT (ltr_context));
      g_object_unref (G_OBJECT (rtl_context));

      style = gtk_text_attributes_new ();

      gtk_widget_ensure_style (widget);
      gtk_text_view_set_attributes_from_style (text_view,
                                               style, widget->style);

      style->pixels_above_lines = 2;
      style->pixels_below_lines = 2;
      style->pixels_inside_wrap = 1;

      style->wrap_mode = text_view->wrap_mode;
      style->justify = GTK_JUSTIFY_LEFT;
      style->direction = gtk_widget_get_direction (GTK_WIDGET (text_view));

      gtk_text_layout_set_default_style (text_view->layout, style);

      gtk_text_attributes_unref (style);
    }
}

static void
gtk_text_view_destroy_layout (GtkTextView *text_view)
{
  if (text_view->layout)
    {
      gtk_text_view_stop_cursor_blink (text_view);
      gtk_text_view_end_selection_drag (text_view, NULL);

      gtk_signal_disconnect_by_func (GTK_OBJECT (text_view->layout),
                                     invalidated_handler, text_view);
      gtk_signal_disconnect_by_func (GTK_OBJECT (text_view->layout),
                                     changed_handler, text_view);
      gtk_object_unref (GTK_OBJECT (text_view->layout));
      text_view->layout = NULL;
    }
}

static void
gtk_text_view_reset_im_context (GtkTextView *text_view)
{
  if (text_view->need_im_reset)
    text_view->need_im_reset = 0;

  gtk_im_context_reset (text_view->im_context);
}

/*
 * DND feature
 */

static void
gtk_text_view_start_selection_dnd (GtkTextView       *text_view,
                                   const GtkTextIter *iter,
                                   GdkEventMotion    *event)
{
  GdkDragContext *context;
  GtkTargetList *target_list;

  text_view->drag_start_x = -1;
  text_view->drag_start_y = -1;

  target_list = gtk_target_list_new (target_table,
                                     G_N_ELEMENTS (target_table));

  context = gtk_drag_begin (GTK_WIDGET (text_view), target_list,
                            GDK_ACTION_COPY | GDK_ACTION_MOVE,
                            1, (GdkEvent*)event);

  gtk_target_list_unref (target_list);

  gtk_drag_set_icon_default (context);

  /* We're inside the selection, so start without being able
   * to accept the drag.
   */
  gdk_drag_status (context, 0, event->time);
  gtk_text_mark_set_visible (text_view->dnd_mark, FALSE);
}

static void
gtk_text_view_drag_begin (GtkWidget        *widget,
                          GdkDragContext   *context)
{

}

static void
gtk_text_view_drag_end (GtkWidget        *widget,
                        GdkDragContext   *context)
{
  GtkTextView *text_view;

  text_view = GTK_TEXT_VIEW (widget);

  gtk_text_mark_set_visible (text_view->dnd_mark, FALSE);
}

static void
gtk_text_view_drag_data_get (GtkWidget        *widget,
                             GdkDragContext   *context,
                             GtkSelectionData *selection_data,
                             guint             info,
                             guint             time)
{
  GtkTextView *text_view;

  text_view = GTK_TEXT_VIEW (widget);

  if (selection_data->target == gdk_atom_intern ("GTK_TEXT_BUFFER_CONTENTS", FALSE))
    {
      GtkTextBuffer *buffer = gtk_text_view_get_buffer (text_view);

      gtk_selection_data_set (selection_data,
                              gdk_atom_intern ("GTK_TEXT_BUFFER_CONTENTS", FALSE),
                              8, /* bytes */
                              (void*)&buffer,
                              sizeof (buffer));
    }
  else
    {
      gchar *str;
      GtkTextIter start;
      GtkTextIter end;
      
      str = NULL;

      if (gtk_text_buffer_get_selection_bounds (get_buffer (text_view),
                                                &start, &end))
        {
          /* Extract the selected text */
          str = gtk_text_iter_get_visible_text (&start, &end);
        }

      if (str)
        {
          gtk_selection_data_set_text (selection_data, str);
          g_free (str);
        }
    }
}

static void
gtk_text_view_drag_data_delete (GtkWidget        *widget,
                                GdkDragContext   *context)
{
  GtkTextView *text_view;

  text_view = GTK_TEXT_VIEW (widget);

  gtk_text_buffer_delete_selection (GTK_TEXT_VIEW (widget)->buffer,
                                    TRUE, GTK_TEXT_VIEW (widget)->editable);
}

static void
gtk_text_view_drag_leave (GtkWidget        *widget,
                          GdkDragContext   *context,
                          guint             time)
{


}

static gboolean
gtk_text_view_drag_motion (GtkWidget        *widget,
                           GdkDragContext   *context,
                           gint              x,
                           gint              y,
                           guint             time)
{
  GtkTextIter newplace;
  GtkTextView *text_view;
  GtkTextIter start;
  GtkTextIter end;
  GdkRectangle target_rect;
  gint bx, by;

  text_view = GTK_TEXT_VIEW (widget);

  target_rect = text_view->text_window->allocation;

  if (x < target_rect.x ||
      y < target_rect.y ||
      x > (target_rect.x + target_rect.width) ||
      y > (target_rect.y + target_rect.height))
    return FALSE; /* outside the text window */

  gtk_text_view_window_to_buffer_coords (text_view,
                                         GTK_TEXT_WINDOW_WIDGET,
                                         x, y,
                                         &bx, &by);

  gtk_text_layout_get_iter_at_pixel (text_view->layout,
                                     &newplace,
                                     bx, by);

  if (gtk_text_buffer_get_selection_bounds (get_buffer (text_view),
                                            &start, &end) &&
      gtk_text_iter_in_range (&newplace, &start, &end))
    {
      /* We're inside the selection. */
      gdk_drag_status (context, 0, time);
      gtk_text_mark_set_visible (text_view->dnd_mark, FALSE);
    }
  else
    {
      if (gtk_text_iter_editable (&newplace, text_view->editable))
        {
          gtk_text_mark_set_visible (text_view->dnd_mark,
                                     text_view->cursor_visible);

          gdk_drag_status (context, context->suggested_action, time);
        }
      else
        {
          /* Can't drop here. */
          gdk_drag_status (context, 0, time);
          gtk_text_mark_set_visible (text_view->dnd_mark, FALSE);
        }
    }

  gtk_text_buffer_move_mark (get_buffer (text_view),
                             gtk_text_buffer_get_mark (get_buffer (text_view),
                                                       "gtk_drag_target"),
                             &newplace);

  {
    /* The effect of this is that the text scrolls if you're near
       the edge. We have to scroll whether or not we're inside
       the selection. */
    gint margin;

    margin = MIN (SCREEN_WIDTH (widget), SCREEN_HEIGHT (widget));
    margin /= 5;

    gtk_text_view_scroll_to_mark_adjusted (text_view,
                                           gtk_text_buffer_get_mark (get_buffer (text_view),
                                                                     "gtk_drag_target"),
                                           margin, 1.0);
  }

  return TRUE;
}

static gboolean
gtk_text_view_drag_drop (GtkWidget        *widget,
                         GdkDragContext   *context,
                         gint              x,
                         gint              y,
                         guint             time)
{
#if 0
  /* called automatically. */
  if (context->targets)
    {
      gtk_drag_get_data (widget, context,
                         GPOINTER_TO_INT (context->targets->data),
                         time);
      return TRUE;
    }
  else
    return FALSE;
#endif
  return TRUE;
}

static void
insert_text_data (GtkTextView      *text_view,
                  GtkTextIter      *drop_point,
                  GtkSelectionData *selection_data)
{
  gchar *str;
  
  str = gtk_selection_data_get_text (selection_data);
  
  if (str)
    {
      gtk_text_buffer_insert_interactive (get_buffer (text_view),
                                          drop_point, str, -1,
                                          text_view->editable);
      g_free (str);
    }
}

static void
gtk_text_view_drag_data_received (GtkWidget        *widget,
                                  GdkDragContext   *context,
                                  gint              x,
                                  gint              y,
                                  GtkSelectionData *selection_data,
                                  guint             info,
                                  guint             time)
{
  GtkTextIter drop_point;
  GtkTextView *text_view;
  GtkTextMark *drag_target_mark;

  text_view = GTK_TEXT_VIEW (widget);

  drag_target_mark = gtk_text_buffer_get_mark (get_buffer (text_view),
                                               "gtk_drag_target");

  if (drag_target_mark == NULL)
    return;

  gtk_text_buffer_get_iter_at_mark (get_buffer (text_view),
                                    &drop_point,
                                    drag_target_mark);

  if (selection_data->target == gdk_atom_intern ("GTK_TEXT_BUFFER_CONTENTS", FALSE))
    {
      GtkTextBuffer *src_buffer = NULL;
      GtkTextIter start, end;
      gboolean copy_tags = TRUE;
      
      if (selection_data->length != sizeof (src_buffer))
        return;
          
      memcpy (&src_buffer, selection_data->data, sizeof (src_buffer));

      if (src_buffer == NULL)
        return;
  
      g_return_if_fail (GTK_IS_TEXT_BUFFER (src_buffer));

      if (gtk_text_buffer_get_tag_table (src_buffer) !=
          gtk_text_buffer_get_tag_table (get_buffer (text_view)))
        copy_tags = FALSE;

      if (gtk_text_buffer_get_selection_bounds (src_buffer,
                                                &start,
                                                &end))
        {
          if (copy_tags)
            gtk_text_buffer_insert_range_interactive (get_buffer (text_view),
                                                      &drop_point,
                                                      &start,
                                                      &end,
                                                      text_view->editable);
          else
            {
              gchar *str;

              str = gtk_text_iter_get_visible_text (&start, &end);
              gtk_text_buffer_insert_interactive (get_buffer (text_view),
                                                  &drop_point, str, -1,
                                                  text_view->editable);
              g_free (str);
            }
        }
    }
  else
    insert_text_data (text_view, &drop_point, selection_data);
}

static GtkAdjustment*
get_hadjustment (GtkTextView *text_view)
{
  if (text_view->hadjustment == NULL)
    gtk_text_view_set_scroll_adjustments (text_view,
                                          (GtkAdjustment*)
                                          gtk_adjustment_new (0.0, 0.0, 0.0,
                                                              0.0, 0.0, 0.0),
                                          text_view->vadjustment);

  return text_view->hadjustment;
}

static GtkAdjustment*
get_vadjustment (GtkTextView *text_view)
{
  if (text_view->vadjustment == NULL)
    gtk_text_view_set_scroll_adjustments (text_view,
                                          text_view->hadjustment,
                                          (GtkAdjustment*)
                                          gtk_adjustment_new (0.0, 0.0, 0.0,
                                                              0.0, 0.0, 0.0));

  return text_view->vadjustment;
}


static void
gtk_text_view_set_scroll_adjustments (GtkTextView   *text_view,
                                      GtkAdjustment *hadj,
                                      GtkAdjustment *vadj)
{
  gboolean need_adjust = FALSE;

  g_return_if_fail (text_view != NULL);
  g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));

  if (hadj)
    g_return_if_fail (GTK_IS_ADJUSTMENT (hadj));
  else
    hadj = GTK_ADJUSTMENT (gtk_adjustment_new (0.0, 0.0, 0.0, 0.0, 0.0, 0.0));
  if (vadj)
    g_return_if_fail (GTK_IS_ADJUSTMENT (vadj));
  else
    vadj = GTK_ADJUSTMENT (gtk_adjustment_new (0.0, 0.0, 0.0, 0.0, 0.0, 0.0));

  if (text_view->hadjustment && (text_view->hadjustment != hadj))
    {
      gtk_signal_disconnect_by_data (GTK_OBJECT (text_view->hadjustment), text_view);
      gtk_object_unref (GTK_OBJECT (text_view->hadjustment));
    }

  if (text_view->vadjustment && (text_view->vadjustment != vadj))
    {
      gtk_signal_disconnect_by_data (GTK_OBJECT (text_view->vadjustment), text_view);
      gtk_object_unref (GTK_OBJECT (text_view->vadjustment));
    }

  if (text_view->hadjustment != hadj)
    {
      text_view->hadjustment = hadj;
      gtk_object_ref (GTK_OBJECT (text_view->hadjustment));
      gtk_object_sink (GTK_OBJECT (text_view->hadjustment));

      gtk_signal_connect (GTK_OBJECT (text_view->hadjustment), "value_changed",
                          (GtkSignalFunc) gtk_text_view_value_changed,
                          text_view);
      need_adjust = TRUE;
    }

  if (text_view->vadjustment != vadj)
    {
      text_view->vadjustment = vadj;
      gtk_object_ref (GTK_OBJECT (text_view->vadjustment));
      gtk_object_sink (GTK_OBJECT (text_view->vadjustment));

      gtk_signal_connect (GTK_OBJECT (text_view->vadjustment), "value_changed",
                          (GtkSignalFunc) gtk_text_view_value_changed,
                          text_view);
      need_adjust = TRUE;
    }

  if (need_adjust)
    gtk_text_view_value_changed (NULL, text_view);
}

static void
gtk_text_view_value_changed (GtkAdjustment *adj,
                             GtkTextView   *text_view)
{
  GtkTextIter iter;
  gint line_top;
  gint dx = 0;
  gint dy = 0;

  if (adj == text_view->hadjustment)
    {
      dx = text_view->xoffset - (gint)adj->value;
      text_view->xoffset = adj->value;
    }
  else if (adj == text_view->vadjustment)
    {
      dy = text_view->yoffset - (gint)adj->value;
      text_view->yoffset = adj->value;

      if (text_view->layout)
        {
          gtk_text_layout_get_line_at_y (text_view->layout, &iter, adj->value, &line_top);

          gtk_text_buffer_move_mark (get_buffer (text_view), text_view->first_para_mark, &iter);

          text_view->first_para_pixels = adj->value - line_top;
        }
    }

  if (dx != 0 || dy != 0)
    {
      if (dy != 0)
        {
          if (text_view->left_window)
            text_window_scroll (text_view->left_window, 0, dy);
          if (text_view->right_window)
            text_window_scroll (text_view->right_window, 0, dy);
        }

      if (dx != 0)
        {
          if (text_view->top_window)
            text_window_scroll (text_view->top_window, dx, 0);
          if (text_view->bottom_window)
            text_window_scroll (text_view->bottom_window, dx, 0);
        }

      /* It looks nicer to scroll the main area last, because
       * it takes a while, and making the side areas update
       * afterward emphasizes the slowness of scrolling the
       * main area.
       */
      text_window_scroll (text_view->text_window, dx, dy);
    }
}

static void
gtk_text_view_commit_handler (GtkIMContext  *context,
                              const gchar   *str,
                              GtkTextView   *text_view)
{
  gtk_text_buffer_delete_selection (get_buffer (text_view), TRUE,
                                    text_view->editable);

  if (!strcmp (str, "\n"))
    {
      gtk_text_buffer_insert_interactive_at_cursor (get_buffer (text_view), "\n", 1,
                                                    text_view->editable);
    }
  else
    {
      if (text_view->overwrite_mode)
        gtk_text_view_delete_from_cursor (text_view, GTK_DELETE_CHARS, 1);
      gtk_text_buffer_insert_interactive_at_cursor (get_buffer (text_view), str, -1,
                                                    text_view->editable);
    }

  gtk_text_view_scroll_to_mark (text_view,
                                gtk_text_buffer_get_mark (get_buffer (text_view),
                                                          "insert"),
                                0);
}

static void 
gtk_text_view_preedit_changed_handler (GtkIMContext *context,
				       GtkTextView  *text_view)
{
  gchar *str;
  PangoAttrList *attrs;
  gint cursor_pos;

  gtk_im_context_get_preedit_string (context, &str, &attrs, &cursor_pos);
  gtk_text_layout_set_preedit_string (text_view->layout, str, attrs, cursor_pos);

  pango_attr_list_unref (attrs);
  g_free (str);
}

static void
gtk_text_view_mark_set_handler (GtkTextBuffer     *buffer,
                                const GtkTextIter *location,
                                GtkTextMark       *mark,
                                gpointer           data)
{
  GtkTextView *text_view = GTK_TEXT_VIEW (data);
  gboolean need_reset = FALSE;

  if (mark == gtk_text_buffer_get_insert (buffer))
    {
      text_view->virtual_cursor_x = -1;
      text_view->virtual_cursor_y = -1;
      need_reset = TRUE;
    }
  else if (mark == gtk_text_buffer_get_selection_bound (buffer))
    {
      need_reset = TRUE;
    }

  if (need_reset)
    gtk_text_view_reset_im_context (text_view);
}

static void
gtk_text_view_get_virtual_cursor_pos (GtkTextView *text_view,
                                      gint        *x,
                                      gint        *y)
{
  GdkRectangle strong_pos;
  GtkTextIter insert;

  gtk_text_buffer_get_iter_at_mark (get_buffer (text_view), &insert,
                                    gtk_text_buffer_get_mark (get_buffer (text_view),
                                                              "insert"));

  if ((x && text_view->virtual_cursor_x == -1) ||
      (y && text_view->virtual_cursor_y == -1))
    gtk_text_layout_get_cursor_locations (text_view->layout, &insert, &strong_pos, NULL);

  if (x)
    {
      if (text_view->virtual_cursor_x != -1)
        *x = text_view->virtual_cursor_x;
      else
        *x = strong_pos.x;
    }

  if (y)
    {
      if (text_view->virtual_cursor_x != -1)
        *y = text_view->virtual_cursor_y;
      else
        *y = strong_pos.y + strong_pos.height / 2;
    }
}

static void
gtk_text_view_set_virtual_cursor_pos (GtkTextView *text_view,
                                      gint         x,
                                      gint         y)
{
  GdkRectangle strong_pos;
  GtkTextIter insert;

  gtk_text_buffer_get_iter_at_mark (get_buffer (text_view), &insert,
                                    gtk_text_buffer_get_mark (get_buffer (text_view),
                                                              "insert"));

  if (x == -1 || y == -1)
    gtk_text_layout_get_cursor_locations (text_view->layout, &insert, &strong_pos, NULL);

  text_view->virtual_cursor_x = (x == -1) ? strong_pos.x : x;
  text_view->virtual_cursor_y = (y == -1) ? strong_pos.y + strong_pos.height / 2 : y;
}

/* Quick hack of a popup menu
 */
static void
activate_cb (GtkWidget   *menuitem,
	     GtkTextView *text_view)
{
  const gchar *signal = gtk_object_get_data (GTK_OBJECT (menuitem), "gtk-signal");
  gtk_signal_emit_by_name (GTK_OBJECT (text_view), signal);
}

static void
append_action_signal (GtkTextView  *text_view,
		      GtkWidget    *menu,
		      const gchar  *label,
		      const gchar  *signal)
{
  GtkWidget *menuitem = gtk_menu_item_new_with_label (label);

  gtk_object_set_data (GTK_OBJECT (menuitem), "gtk-signal", (char *)signal);
  gtk_signal_connect (GTK_OBJECT (menuitem), "activate",
		      activate_cb, text_view);

  gtk_widget_show (menuitem);
  gtk_menu_shell_append (GTK_MENU_SHELL (menu), menuitem);
}
	
static void
popup_menu_detach (GtkWidget *attach_widget,
		   GtkMenu   *menu)
{
  GTK_TEXT_VIEW (attach_widget)->popup_menu = NULL;
}

static void
gtk_text_view_popup_menu (GtkTextView    *text_view,
			  GdkEventButton *event)
{
  if (!text_view->popup_menu)
    {
      GtkWidget *menuitem;
      
      text_view->popup_menu = gtk_menu_new ();

      gtk_menu_attach_to_widget (GTK_MENU (text_view->popup_menu),
				 GTK_WIDGET (text_view),
				 popup_menu_detach);

      append_action_signal (text_view, text_view->popup_menu, _("Cut"), "cut_clipboard");
      append_action_signal (text_view, text_view->popup_menu, _("Copy"), "copy_clipboard");
      append_action_signal (text_view, text_view->popup_menu, _("Paste"), "paste_clipboard");

      menuitem = gtk_menu_item_new (); /* Separator */
      gtk_widget_show (menuitem);
      gtk_menu_shell_append (GTK_MENU_SHELL (text_view->popup_menu), menuitem);

      gtk_im_multicontext_append_menuitems (GTK_IM_MULTICONTEXT (text_view->im_context),
					    GTK_MENU_SHELL (text_view->popup_menu));
    }

  gtk_menu_popup (GTK_MENU (text_view->popup_menu), NULL, NULL,
		  NULL, NULL,
		  event->button, event->time);
}



/* Child GdkWindows */


static GtkTextWindow*
text_window_new (GtkTextWindowType  type,
                 GtkWidget         *widget,
                 gint               width_request,
                 gint               height_request)
{
  GtkTextWindow *win;

  win = g_new (GtkTextWindow, 1);

  win->type = type;
  win->widget = widget;
  win->window = NULL;
  win->bin_window = NULL;
  win->requisition.width = width_request;
  win->requisition.height = height_request;
  win->allocation.width = width_request;
  win->allocation.height = height_request;
  win->allocation.x = 0;
  win->allocation.y = 0;

  return win;
}

static void
text_window_free (GtkTextWindow *win)
{
  if (win->window)
    text_window_unrealize (win);

  g_free (win);
}

static void
text_window_realize (GtkTextWindow *win,
                     GdkWindow     *parent)
{
  GdkWindowAttr attributes;
  gint attributes_mask;
  GdkCursor *cursor;

  attributes.window_type = GDK_WINDOW_CHILD;
  attributes.x = win->allocation.x;
  attributes.y = win->allocation.y;
  attributes.width = win->allocation.width;
  attributes.height = win->allocation.height;
  attributes.wclass = GDK_INPUT_OUTPUT;
  attributes.visual = gtk_widget_get_visual (win->widget);
  attributes.colormap = gtk_widget_get_colormap (win->widget);
  attributes.event_mask = GDK_VISIBILITY_NOTIFY_MASK;

  attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;

  win->window = gdk_window_new (parent,
                                &attributes,
                                attributes_mask);

  gdk_window_show (win->window);
  gdk_window_set_user_data (win->window, win->widget);

  attributes.x = 0;
  attributes.y = 0;
  attributes.width = win->allocation.width;
  attributes.height = win->allocation.height;
  attributes.event_mask = (GDK_EXPOSURE_MASK            |
                           GDK_SCROLL_MASK              |
                           GDK_KEY_PRESS_MASK           |
                           GDK_BUTTON_PRESS_MASK        |
                           GDK_BUTTON_RELEASE_MASK      |
                           GDK_POINTER_MOTION_MASK      |
                           GDK_POINTER_MOTION_HINT_MASK |
                           gtk_widget_get_events (win->widget));

  win->bin_window = gdk_window_new (win->window,
                                    &attributes,
                                    attributes_mask);

  gdk_window_show (win->bin_window);
  gdk_window_set_user_data (win->bin_window, win->widget);

  if (win->type == GTK_TEXT_WINDOW_TEXT)
    {
      /* I-beam cursor */
      cursor = gdk_cursor_new (GDK_XTERM);
      gdk_window_set_cursor (win->bin_window, cursor);
      gdk_cursor_destroy (cursor);

      gtk_im_context_set_client_window (GTK_TEXT_VIEW (win->widget)->im_context,
                                        win->window);


      gdk_window_set_background (win->bin_window,
                                 &win->widget->style->base[GTK_WIDGET_STATE (win->widget)]);
    }
  else
    {
      gdk_window_set_background (win->bin_window,
                                 &win->widget->style->bg[GTK_WIDGET_STATE (win->widget)]);
    }

  g_object_set_qdata (G_OBJECT (win->window),
                      g_quark_from_static_string ("gtk-text-view-text-window"),
                      win);

  g_object_set_qdata (G_OBJECT (win->bin_window),
                      g_quark_from_static_string ("gtk-text-view-text-window"),
                      win);
}

static void
text_window_unrealize (GtkTextWindow *win)
{
  if (win->type == GTK_TEXT_WINDOW_TEXT)
    {
      gtk_im_context_set_client_window (GTK_TEXT_VIEW (win->widget)->im_context,
                                        NULL);
    }

  gdk_window_set_user_data (win->window, NULL);
  gdk_window_set_user_data (win->bin_window, NULL);
  gdk_window_destroy (win->bin_window);
  gdk_window_destroy (win->window);
  win->window = NULL;
  win->bin_window = NULL;
}

static void
text_window_size_allocate (GtkTextWindow *win,
                           GdkRectangle  *rect)
{
  win->allocation = *rect;

  if (win->window)
    {
      gdk_window_move_resize (win->window,
                              rect->x, rect->y,
                              rect->width, rect->height);

      gdk_window_resize (win->bin_window,
                         rect->width, rect->height);
    }
}

static void
text_window_scroll        (GtkTextWindow *win,
                           gint           dx,
                           gint           dy)
{
  if (dx != 0 || dy != 0)
    {
      gdk_window_scroll (win->bin_window, dx, dy);
      gdk_window_process_updates (win->bin_window, TRUE);
    }
}

static void
text_window_invalidate_rect (GtkTextWindow *win,
                             GdkRectangle  *rect)
{
  gdk_window_invalidate_rect (win->bin_window, rect, FALSE);
}

static gint
text_window_get_width (GtkTextWindow *win)
{
  return win->allocation.width;
}

static gint
text_window_get_height (GtkTextWindow *win)
{
  return win->allocation.height;
}

static void
text_window_get_allocation (GtkTextWindow *win,
                            GdkRectangle  *rect)
{
  *rect = win->allocation;
}

/* Windows */


/**
 * gtk_text_view_get_window:
 * @text_view: a #GtkTextView
 * @win: window to get
 * 
 * Retrieves the #GdkWindow corresponding to an area of the text view;
 * possible windows include the overall widget window, child windows
 * on the left, right, top, bottom, and the window that displays the
 * text buffer. Windows are %NULL and nonexistent if their width or
 * height is 0, and are nonexistent before the widget has been
 * realized.
 * 
 * Return value: a #GdkWindow, or %NULL
 **/
GdkWindow*
gtk_text_view_get_window (GtkTextView *text_view,
                          GtkTextWindowType win)
{
  g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), NULL);

  switch (win)
    {
    case GTK_TEXT_WINDOW_WIDGET:
      return GTK_WIDGET (text_view)->window;
      break;

    case GTK_TEXT_WINDOW_TEXT:
      return text_view->text_window->bin_window;
      break;

    case GTK_TEXT_WINDOW_LEFT:
      if (text_view->left_window)
        return text_view->left_window->bin_window;
      else
        return NULL;
      break;

    case GTK_TEXT_WINDOW_RIGHT:
      if (text_view->right_window)
        return text_view->right_window->bin_window;
      else
        return NULL;
      break;

    case GTK_TEXT_WINDOW_TOP:
      if (text_view->top_window)
        return text_view->top_window->bin_window;
      else
        return NULL;
      break;

    case GTK_TEXT_WINDOW_BOTTOM:
      if (text_view->bottom_window)
        return text_view->bottom_window->bin_window;
      else
        return NULL;
      break;

    default:
      g_warning ("%s: Unknown GtkTextWindowType", G_STRLOC);
      return NULL;
      break;
    }
}

/**
 * gtk_text_view_get_window_type:
 * @text_view: a #GtkTextView
 * @window: a window type
 * 
 * Usually used to find out which window an event corresponds to.
 * If you connect to an event signal on @text_view, this function
 * should be called on <literal>event-&gt;window</literal> to
 * see which window it was.
 * 
 * Return value: the window type.
 **/
GtkTextWindowType
gtk_text_view_get_window_type (GtkTextView *text_view,
                               GdkWindow   *window)
{
  GtkTextWindow *win;

  g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), 0);
  g_return_val_if_fail (GDK_IS_WINDOW (text_view), 0);

  if (window == GTK_WIDGET (text_view)->window)
    return GTK_TEXT_WINDOW_WIDGET;

  win = g_object_get_qdata (G_OBJECT (window),
                            g_quark_try_string ("gtk-text-view-text-window"));

  if (win)
    return win->type;
  else
    {
      return GTK_TEXT_WINDOW_PRIVATE;
    }
}

static void
buffer_to_widget (GtkTextView      *text_view,
                  gint              buffer_x,
                  gint              buffer_y,
                  gint             *window_x,
                  gint             *window_y)
{
  if (window_x)
    {
      *window_x = buffer_x - text_view->xoffset + FOCUS_EDGE_WIDTH;
      if (text_view->left_window)
        *window_x += text_view->left_window->allocation.width;
    }

  if (window_y)
    {
      *window_y = buffer_y - text_view->yoffset + FOCUS_EDGE_WIDTH;
      if (text_view->top_window)
        *window_y += text_view->top_window->allocation.height;
    }
}

static void
widget_to_text_window (GtkTextWindow *win,
                       gint           widget_x,
                       gint           widget_y,
                       gint          *window_x,
                       gint          *window_y)
{
  if (window_x)
    *window_x = widget_x - win->allocation.x;

  if (window_y)
    *window_y = widget_y - win->allocation.y;
}

static void
buffer_to_text_window (GtkTextView   *text_view,
                       GtkTextWindow *win,
                       gint           buffer_x,
                       gint           buffer_y,
                       gint          *window_x,
                       gint          *window_y)
{
  if (win == NULL)
    {
      g_warning ("Attempt to convert text buffer coordinates to coordinates "
                 "for a nonexistent or private child window of GtkTextView");
      return;
    }

  buffer_to_widget (text_view,
                    buffer_x, buffer_y,
                    window_x, window_y);

  widget_to_text_window (win,
                         window_x ? *window_x : 0,
                         window_y ? *window_y : 0,
                         window_x,
                         window_y);
}

/**
 * gtk_text_view_buffer_to_window_coords:
 * @text_view: a #GtkTextView
 * @win: a #GtkTextWindowType
 * @buffer_x: buffer x coordinate
 * @buffer_y: buffer y coordinate
 * @window_x: window x coordinate return location
 * @window_y: window y coordinate return location
 * 
 * Converts coordinate (@buffer_x, @buffer_y) to coordinates for the window
 * @win, and stores the result in (@window_x, @window_y).
 **/
void
gtk_text_view_buffer_to_window_coords (GtkTextView      *text_view,
                                       GtkTextWindowType win,
                                       gint              buffer_x,
                                       gint              buffer_y,
                                       gint             *window_x,
                                       gint             *window_y)
{
  g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));

  switch (win)
    {
    case GTK_TEXT_WINDOW_WIDGET:
      buffer_to_widget (text_view,
                        buffer_x, buffer_y,
                        window_x, window_y);
      break;

    case GTK_TEXT_WINDOW_TEXT:
      if (window_x)
        *window_x = buffer_x - text_view->xoffset;
      if (window_y)
        *window_y = buffer_y - text_view->yoffset;
      break;

    case GTK_TEXT_WINDOW_LEFT:
      buffer_to_text_window (text_view,
                             text_view->left_window,
                             buffer_x, buffer_y,
                             window_x, window_y);
      break;

    case GTK_TEXT_WINDOW_RIGHT:
      buffer_to_text_window (text_view,
                             text_view->right_window,
                             buffer_x, buffer_y,
                             window_x, window_y);
      break;

    case GTK_TEXT_WINDOW_TOP:
      buffer_to_text_window (text_view,
                             text_view->top_window,
                             buffer_x, buffer_y,
                             window_x, window_y);
      break;

    case GTK_TEXT_WINDOW_BOTTOM:
      buffer_to_text_window (text_view,
                             text_view->bottom_window,
                             buffer_x, buffer_y,
                             window_x, window_y);
      break;

    case GTK_TEXT_WINDOW_PRIVATE:
      g_warning ("%s: can't get coords for private windows", G_STRLOC);
      break;
      
    default:
      g_warning ("%s: Unknown GtkTextWindowType", G_STRLOC);
      break;
    }
}

static void
widget_to_buffer (GtkTextView *text_view,
                  gint         widget_x,
                  gint         widget_y,
                  gint        *buffer_x,
                  gint        *buffer_y)
{
  if (buffer_x)
    {
      *buffer_x = widget_x - FOCUS_EDGE_WIDTH + text_view->xoffset;
      if (text_view->left_window)
        *buffer_x -= text_view->left_window->allocation.width;
    }

  if (buffer_y)
    {
      *buffer_y = widget_y - FOCUS_EDGE_WIDTH + text_view->yoffset;
      if (text_view->top_window)
        *buffer_y -= text_view->top_window->allocation.height;
    }
}

static void
text_window_to_widget (GtkTextWindow *win,
                       gint           window_x,
                       gint           window_y,
                       gint          *widget_x,
                       gint          *widget_y)
{
  if (widget_x)
    *widget_x = window_x + win->allocation.x;

  if (widget_y)
    *widget_y = window_y + win->allocation.y;
}

static void
text_window_to_buffer (GtkTextView   *text_view,
                       GtkTextWindow *win,
                       gint           window_x,
                       gint           window_y,
                       gint          *buffer_x,
                       gint          *buffer_y)
{
  if (win == NULL)
    {
      g_warning ("Attempt to convert GtkTextView buffer coordinates into "
                 "coordinates for a nonexistent child window.");
      return;
    }

  text_window_to_widget (win,
                         window_x,
                         window_y,
                         buffer_x,
                         buffer_y);

  widget_to_buffer (text_view,
                    buffer_x ? *buffer_x : 0,
                    buffer_y ? *buffer_y : 0,
                    buffer_x,
                    buffer_y);
}

/**
 * gtk_text_view_window_to_buffer_coords:
 * @text_view: a #GtkTextView
 * @win: a #GtkTextWindowType
 * @window_x: window x coordinate
 * @window_y: window y coordinate
 * @buffer_x: buffer x coordinate return location
 * @buffer_y: buffer y coordinate return location
 * 
 * Converts coordinates on the window identified by @win to buffer
 * coordinates, storing the result in (@buffer_x,@buffer_y).
 **/
void
gtk_text_view_window_to_buffer_coords (GtkTextView      *text_view,
                                       GtkTextWindowType win,
                                       gint              window_x,
                                       gint              window_y,
                                       gint             *buffer_x,
                                       gint             *buffer_y)
{
  g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));

  switch (win)
    {
    case GTK_TEXT_WINDOW_WIDGET:
      widget_to_buffer (text_view,
                        window_x, window_y,
                        buffer_x, buffer_y);
      break;

    case GTK_TEXT_WINDOW_TEXT:
      if (buffer_x)
        *buffer_x = window_x + text_view->xoffset;
      if (buffer_y)
        *buffer_y = window_y + text_view->yoffset;
      break;

    case GTK_TEXT_WINDOW_LEFT:
      text_window_to_buffer (text_view,
                             text_view->left_window,
                             window_x, window_y,
                             buffer_x, buffer_y);
      break;

    case GTK_TEXT_WINDOW_RIGHT:
      text_window_to_buffer (text_view,
                             text_view->right_window,
                             window_x, window_y,
                             buffer_x, buffer_y);
      break;

    case GTK_TEXT_WINDOW_TOP:
      text_window_to_buffer (text_view,
                             text_view->top_window,
                             window_x, window_y,
                             buffer_x, buffer_y);
      break;

    case GTK_TEXT_WINDOW_BOTTOM:
      text_window_to_buffer (text_view,
                             text_view->bottom_window,
                             window_x, window_y,
                             buffer_x, buffer_y);
      break;

    case GTK_TEXT_WINDOW_PRIVATE:
      g_warning ("%s: can't get coords for private windows", G_STRLOC);
      break;
      
    default:
      g_warning ("%s: Unknown GtkTextWindowType", G_STRLOC);
      break;
    }
}

static void
set_window_width (GtkTextView      *text_view,
                  gint              width,
                  GtkTextWindowType type,
                  GtkTextWindow   **winp)
{
  if (width == 0)
    {
      if (*winp)
        {
          text_window_free (*winp);
          *winp = NULL;
          gtk_widget_queue_resize (GTK_WIDGET (text_view));
        }
    }
  else
    {
      if (*winp == NULL)
        {
          *winp = text_window_new (type,
                                   GTK_WIDGET (text_view),
                                   width, 0);
        }
      else
        {
          if ((*winp)->requisition.width == width)
            return;
        }

      gtk_widget_queue_resize (GTK_WIDGET (text_view));
    }
}


static void
set_window_height (GtkTextView      *text_view,
                   gint              height,
                   GtkTextWindowType type,
                   GtkTextWindow   **winp)
{
  if (height == 0)
    {
      if (*winp)
        {
          text_window_free (*winp);
          *winp = NULL;
          gtk_widget_queue_resize (GTK_WIDGET (text_view));
        }
    }
  else
    {
      if (*winp == NULL)
        {
          *winp = text_window_new (type,
                                   GTK_WIDGET (text_view),
                                   0, height);
        }
      else
        {
          if ((*winp)->requisition.height == height)
            return;
        }

      gtk_widget_queue_resize (GTK_WIDGET (text_view));
    }
}

/**
 * gtk_text_view_set_border_window_size:
 * @text_view: a #GtkTextView
 * @type: window to affect
 * @size: width or height of the window
 * 
 * Sets the width of %GTK_TEXT_WINDOW_LEFT or %GTK_TEXT_WINDOW_RIGHT,
 * or the height of %GTK_TEXT_WINDOW_TOP or %GTK_TEXT_WINDOW_BOTTOM.
 * Automatically destroys the corresponding window if the size is set to 0,
 * and creates the window if the size is set to non-zero.
 **/
void
gtk_text_view_set_border_window_size (GtkTextView      *text_view,
                                      GtkTextWindowType type,
                                      gint              size)

{
  g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));
  g_return_if_fail (size >= 0);
  g_return_if_fail (type != GTK_TEXT_WINDOW_WIDGET);
  g_return_if_fail (type != GTK_TEXT_WINDOW_TEXT);

  switch (type)
    {
    case GTK_TEXT_WINDOW_LEFT:
      set_window_width (text_view, size, GTK_TEXT_WINDOW_LEFT,
                        &text_view->left_window);
      break;

    case GTK_TEXT_WINDOW_RIGHT:
      set_window_width (text_view, size, GTK_TEXT_WINDOW_RIGHT,
                        &text_view->right_window);
      break;

    case GTK_TEXT_WINDOW_TOP:
      set_window_height (text_view, size, GTK_TEXT_WINDOW_TOP,
                         &text_view->top_window);
      break;

    case GTK_TEXT_WINDOW_BOTTOM:
      set_window_height (text_view, size, GTK_TEXT_WINDOW_BOTTOM,
                         &text_view->bottom_window);
      break;

    default:
      g_warning ("Can't set size of center or widget or private GtkTextWindowType in %s", G_STRLOC);
      break;
    }
}

/**
 * gtk_text_view_set_text_window_size:
 * @text_view: a #GtkTextView
 * @width: a width in pixels
 * @height: a height in pixels
 * 
 * Sets the size request for the main text window (%GTK_TEXT_WINDOW_TEXT).
 * If the widget gets more space than it requested, the main text window
 * will be larger than this.
 * 
 **/
void
gtk_text_view_set_text_window_size (GtkTextView *text_view,
                                    gint         width,
                                    gint         height)
{
  GtkTextWindow *win;

  g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));
  g_return_if_fail (width > 0);
  g_return_if_fail (height > 0);

  win = text_view->text_window;

  if (win->requisition.width == width &&
      win->requisition.height == height)
    return;

  win->requisition.width = width;
  win->requisition.height = height;

  gtk_widget_queue_resize (GTK_WIDGET (text_view));
}

/*
 * Child widgets
 */

static GtkTextViewChild*
text_view_child_new_anchored (GtkWidget          *child,
                              GtkTextChildAnchor *anchor,
                              GtkTextLayout      *layout)
{
  GtkTextViewChild *vc;
  
  vc = g_new (GtkTextViewChild, 1);

  vc->widget = child;
  vc->anchor = anchor;

  g_object_ref (G_OBJECT (vc->widget));
  g_object_ref (G_OBJECT (vc->anchor));

  gtk_object_set_data (GTK_OBJECT (child),
                       "gtk-text-view-child",
                       vc);

  gtk_text_child_anchor_register_child (anchor, child, layout);
  
  return vc;
}

static GtkTextViewChild*
text_view_child_new_window (GtkWidget          *child,
                            GtkTextWindowType   type,
                            gint                x,
                            gint                y)
{
  GtkTextViewChild *vc;

  vc = g_new (GtkTextViewChild, 1);

  vc->widget = child;
  vc->anchor = NULL;

  g_object_ref (G_OBJECT (vc->widget));

  vc->type = type;
  vc->x = x;
  vc->y = y;

  return vc;
}

static void
text_view_child_free (GtkTextViewChild *child)
{

  gtk_object_remove_data (GTK_OBJECT (child->widget),
                          "gtk-text-view-child");

  if (child->anchor)
    {
      gtk_text_child_anchor_unregister_child (child->anchor,
                                              child->widget);
      g_object_unref (G_OBJECT (child->anchor));
    }

  g_object_unref (G_OBJECT (child->widget));
  
  g_free (child);
}

static void
text_view_child_realize (GtkTextView      *text_view,
                         GtkTextViewChild *vc)
{
  if (vc->anchor)
    gtk_widget_set_parent_window (vc->widget,
                                  text_view->text_window->bin_window);
  else
    {
      GdkWindow *window;
      window = gtk_text_view_get_window (text_view,
                                         vc->type);
      gtk_widget_set_parent_window (vc->widget, window);
    }

  gtk_widget_realize (vc->widget);
}

static void
add_child (GtkTextView      *text_view,
           GtkTextViewChild *vc)
{
  text_view->children = g_slist_prepend (text_view->children,
                                         vc);

  gtk_widget_set_parent (vc->widget, GTK_WIDGET (text_view));

  if (GTK_WIDGET_REALIZED (text_view))
    text_view_child_realize (text_view, vc);

  if (GTK_WIDGET_VISIBLE (text_view) && GTK_WIDGET_VISIBLE (vc->widget))
    {
      if (GTK_WIDGET_MAPPED (text_view))
        gtk_widget_map (vc->widget);

      gtk_widget_queue_resize (vc->widget);
    }
}

void
gtk_text_view_add_child_at_anchor (GtkTextView          *text_view,
                                   GtkWidget            *child,
                                   GtkTextChildAnchor   *anchor)
{
  GtkTextViewChild *vc;

  g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));
  g_return_if_fail (GTK_IS_WIDGET (child));
  g_return_if_fail (GTK_IS_TEXT_CHILD_ANCHOR (anchor));
  g_return_if_fail (child->parent == NULL);

  gtk_text_view_ensure_layout (text_view);
  
  vc = text_view_child_new_anchored (child, anchor,
                                     text_view->layout);

  add_child (text_view, vc);
}

void
gtk_text_view_add_child_in_window (GtkTextView          *text_view,
                                   GtkWidget            *child,
                                   GtkTextWindowType     which_window,
                                   gint                  xpos,
                                   gint                  ypos)
{
  GtkTextViewChild *vc;

  g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));
  g_return_if_fail (GTK_IS_WIDGET (child));
  g_return_if_fail (xpos >= 0);
  g_return_if_fail (ypos >= 0);
  g_return_if_fail (child->parent == NULL);

  vc = text_view_child_new_window (child, which_window,
                                   xpos, ypos);

  add_child (text_view, vc);
}

void
gtk_text_view_move_child          (GtkTextView          *text_view,
                                   GtkWidget            *child,
                                   gint                  xpos,
                                   gint                  ypos)
{
  GtkTextViewChild *vc;

  g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));
  g_return_if_fail (GTK_IS_WIDGET (child));
  g_return_if_fail (xpos >= 0);
  g_return_if_fail (ypos >= 0);
  g_return_if_fail (child->parent == (GtkWidget*) text_view);

  vc = gtk_object_get_data (GTK_OBJECT (child),
                            "gtk-text-view-child");

  g_assert (vc != NULL);

  vc->x = xpos;
  vc->y = ypos;

  if (GTK_WIDGET_VISIBLE (child) && GTK_WIDGET_VISIBLE (text_view))
    gtk_widget_queue_resize (child);
}


