539 lines
16 KiB
C
539 lines
16 KiB
C
/* gtktextmark.c - mark segments
|
||
*
|
||
* Copyright (c) 1994 The Regents of the University of California.
|
||
* Copyright (c) 1994-1997 Sun Microsystems, Inc.
|
||
* Copyright (c) 2000 Red Hat, Inc.
|
||
* Tk -> Gtk port by Havoc Pennington <hp@redhat.com>
|
||
*
|
||
* This software is copyrighted by the Regents of the University of
|
||
* California, Sun Microsystems, Inc., and other parties. The
|
||
* following terms apply to all files associated with the software
|
||
* unless explicitly disclaimed in individual files.
|
||
*
|
||
* The authors hereby grant permission to use, copy, modify,
|
||
* distribute, and license this software and its documentation for any
|
||
* purpose, provided that existing copyright notices are retained in
|
||
* all copies and that this notice is included verbatim in any
|
||
* distributions. No written agreement, license, or royalty fee is
|
||
* required for any of the authorized uses. Modifications to this
|
||
* software may be copyrighted by their authors and need not follow
|
||
* the licensing terms described here, provided that the new terms are
|
||
* clearly indicated on the first page of each file where they apply.
|
||
*
|
||
* IN NO EVENT SHALL THE AUTHORS OR DISTRIBUTORS BE LIABLE TO ANY
|
||
* PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
|
||
* DAMAGES ARISING OUT OF THE USE OF THIS SOFTWARE, ITS DOCUMENTATION,
|
||
* OR ANY DERIVATIVES THEREOF, EVEN IF THE AUTHORS HAVE BEEN ADVISED
|
||
* OF THE POSSIBILITY OF SUCH DAMAGE.
|
||
*
|
||
* THE AUTHORS AND DISTRIBUTORS SPECIFICALLY DISCLAIM ANY WARRANTIES,
|
||
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
||
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND
|
||
* NON-INFRINGEMENT. THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS,
|
||
* AND THE AUTHORS AND DISTRIBUTORS HAVE NO OBLIGATION TO PROVIDE
|
||
* MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
|
||
*
|
||
* GOVERNMENT USE: If you are acquiring this software on behalf of the
|
||
* U.S. government, the Government shall have only "Restricted Rights"
|
||
* in the software and related documentation as defined in the Federal
|
||
* Acquisition Regulations (FARs) in Clause 52.227.19 (c) (2). If you
|
||
* are acquiring the software on behalf of the Department of Defense,
|
||
* the software shall be classified as "Commercial Computer Software"
|
||
* and the Government shall have only "Restricted Rights" as defined
|
||
* in Clause 252.227-7013 (c) (1) of DFARs. Notwithstanding the
|
||
* foregoing, the authors grant the U.S. Government and others acting
|
||
* in its behalf permission to use and distribute the software in
|
||
* accordance with the terms specified in this license.
|
||
*
|
||
*/
|
||
|
||
#define GTK_TEXT_USE_INTERNAL_UNSUPPORTED_API
|
||
#include "config.h"
|
||
#include "gtktextbtree.h"
|
||
#include "gtkprivate.h"
|
||
#include "gtkintl.h"
|
||
|
||
|
||
/**
|
||
* SECTION:gtktextmark
|
||
* @Short_description: A position in the buffer preserved across buffer modifications
|
||
* @Title: GtkTextMark
|
||
*
|
||
* You may wish to begin by reading the
|
||
* [text widget conceptual overview][TextWidget]
|
||
* which gives an overview of all the objects and data
|
||
* types related to the text widget and how they work together.
|
||
*
|
||
* A #GtkTextMark is like a bookmark in a text buffer; it preserves a position in
|
||
* the text. You can convert the mark to an iterator using
|
||
* gtk_text_buffer_get_iter_at_mark(). Unlike iterators, marks remain valid across
|
||
* buffer mutations, because their behavior is defined when text is inserted or
|
||
* deleted. When text containing a mark is deleted, the mark remains in the
|
||
* position originally occupied by the deleted text. When text is inserted at a
|
||
* mark, a mark with “left gravity” will be moved to the
|
||
* beginning of the newly-inserted text, and a mark with “right
|
||
* gravity” will be moved to the end.
|
||
*
|
||
* Note that “left” and “right” here refer to logical direction (left
|
||
* is the toward the start of the buffer); in some languages such as
|
||
* Hebrew the logically-leftmost text is not actually on the left when
|
||
* displayed.
|
||
*
|
||
* Marks are reference counted, but the reference count only controls the validity
|
||
* of the memory; marks can be deleted from the buffer at any time with
|
||
* gtk_text_buffer_delete_mark(). Once deleted from the buffer, a mark is
|
||
* essentially useless.
|
||
*
|
||
* Marks optionally have names; these can be convenient to avoid passing the
|
||
* #GtkTextMark object around.
|
||
*
|
||
* Marks are typically created using the gtk_text_buffer_create_mark() function.
|
||
*/
|
||
|
||
/*
|
||
* Macro that determines the size of a mark segment:
|
||
*/
|
||
#define MSEG_SIZE ((unsigned) (G_STRUCT_OFFSET (GtkTextLineSegment, body) \
|
||
+ sizeof (GtkTextMarkBody)))
|
||
|
||
static void gtk_text_mark_set_property (GObject *object,
|
||
guint prop_id,
|
||
const GValue *value,
|
||
GParamSpec *pspec);
|
||
static void gtk_text_mark_get_property (GObject *object,
|
||
guint prop_id,
|
||
GValue *value,
|
||
GParamSpec *pspec);
|
||
static void gtk_text_mark_finalize (GObject *object);
|
||
|
||
static GtkTextLineSegment *gtk_mark_segment_new (GtkTextMark *mark_obj);
|
||
|
||
G_DEFINE_TYPE (GtkTextMark, gtk_text_mark, G_TYPE_OBJECT)
|
||
|
||
enum {
|
||
PROP_0,
|
||
PROP_NAME,
|
||
PROP_LEFT_GRAVITY
|
||
};
|
||
|
||
static void
|
||
gtk_text_mark_class_init (GtkTextMarkClass *klass)
|
||
{
|
||
GObjectClass *object_class = G_OBJECT_CLASS (klass);
|
||
|
||
object_class->finalize = gtk_text_mark_finalize;
|
||
object_class->set_property = gtk_text_mark_set_property;
|
||
object_class->get_property = gtk_text_mark_get_property;
|
||
|
||
/**
|
||
* GtkTextMark:name:
|
||
*
|
||
* The name of the mark or %NULL if the mark is anonymous.
|
||
*/
|
||
g_object_class_install_property (object_class,
|
||
PROP_NAME,
|
||
g_param_spec_string ("name",
|
||
P_("Name"),
|
||
P_("Mark name"),
|
||
NULL,
|
||
GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY));
|
||
|
||
/**
|
||
* GtkTextMark:left-gravity:
|
||
*
|
||
* Whether the mark has left gravity. When text is inserted at the mark’s
|
||
* current location, if the mark has left gravity it will be moved
|
||
* to the left of the newly-inserted text, otherwise to the right.
|
||
*/
|
||
g_object_class_install_property (object_class,
|
||
PROP_LEFT_GRAVITY,
|
||
g_param_spec_boolean ("left-gravity",
|
||
P_("Left gravity"),
|
||
P_("Whether the mark has left gravity"),
|
||
FALSE,
|
||
GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY));
|
||
}
|
||
|
||
static void
|
||
gtk_text_mark_init (GtkTextMark *mark)
|
||
{
|
||
mark->segment = gtk_mark_segment_new (mark);
|
||
}
|
||
|
||
static void
|
||
gtk_text_mark_finalize (GObject *obj)
|
||
{
|
||
GtkTextMark *mark;
|
||
GtkTextLineSegment *seg;
|
||
|
||
mark = GTK_TEXT_MARK (obj);
|
||
|
||
seg = mark->segment;
|
||
|
||
if (seg)
|
||
{
|
||
if (seg->body.mark.tree != NULL)
|
||
g_warning ("GtkTextMark being finalized while still in the buffer; "
|
||
"someone removed a reference they didn't own! Crash "
|
||
"impending");
|
||
|
||
g_free (seg->body.mark.name);
|
||
g_slice_free1 (MSEG_SIZE, seg);
|
||
|
||
mark->segment = NULL;
|
||
}
|
||
|
||
/* chain parent_class' handler */
|
||
G_OBJECT_CLASS (gtk_text_mark_parent_class)->finalize (obj);
|
||
}
|
||
|
||
static void
|
||
gtk_text_mark_set_property (GObject *object,
|
||
guint prop_id,
|
||
const GValue *value,
|
||
GParamSpec *pspec)
|
||
{
|
||
gchar *tmp;
|
||
GtkTextMark *mark = GTK_TEXT_MARK (object);
|
||
GtkTextLineSegment *seg = mark->segment;
|
||
|
||
switch (prop_id)
|
||
{
|
||
case PROP_NAME:
|
||
tmp = seg->body.mark.name;
|
||
seg->body.mark.name = g_value_dup_string (value);
|
||
g_free (tmp);
|
||
break;
|
||
|
||
case PROP_LEFT_GRAVITY:
|
||
if (g_value_get_boolean (value))
|
||
seg->type = >k_text_left_mark_type;
|
||
else
|
||
seg->type = >k_text_right_mark_type;
|
||
break;
|
||
|
||
default:
|
||
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
|
||
}
|
||
}
|
||
|
||
static void
|
||
gtk_text_mark_get_property (GObject *object,
|
||
guint prop_id,
|
||
GValue *value,
|
||
GParamSpec *pspec)
|
||
{
|
||
GtkTextMark *mark = GTK_TEXT_MARK (object);
|
||
|
||
switch (prop_id)
|
||
{
|
||
case PROP_NAME:
|
||
g_value_set_string (value, gtk_text_mark_get_name (mark));
|
||
break;
|
||
|
||
case PROP_LEFT_GRAVITY:
|
||
g_value_set_boolean (value, gtk_text_mark_get_left_gravity (mark));
|
||
break;
|
||
|
||
default:
|
||
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
|
||
}
|
||
}
|
||
|
||
/**
|
||
* gtk_text_mark_new:
|
||
* @name: (allow-none): mark name or %NULL
|
||
* @left_gravity: whether the mark should have left gravity
|
||
*
|
||
* Creates a text mark. Add it to a buffer using gtk_text_buffer_add_mark().
|
||
* If @name is %NULL, the mark is anonymous; otherwise, the mark can be
|
||
* retrieved by name using gtk_text_buffer_get_mark(). If a mark has left
|
||
* gravity, and text is inserted at the mark’s current location, the mark
|
||
* will be moved to the left of the newly-inserted text. If the mark has
|
||
* right gravity (@left_gravity = %FALSE), the mark will end up on the
|
||
* right of newly-inserted text. The standard left-to-right cursor is a
|
||
* mark with right gravity (when you type, the cursor stays on the right
|
||
* side of the text you’re typing).
|
||
*
|
||
* Returns: new #GtkTextMark
|
||
*
|
||
* Since: 2.12
|
||
**/
|
||
GtkTextMark *
|
||
gtk_text_mark_new (const gchar *name,
|
||
gboolean left_gravity)
|
||
{
|
||
return g_object_new (GTK_TYPE_TEXT_MARK,
|
||
"name", name,
|
||
"left-gravity", left_gravity,
|
||
NULL);
|
||
}
|
||
|
||
/**
|
||
* gtk_text_mark_get_visible:
|
||
* @mark: a #GtkTextMark
|
||
*
|
||
* Returns %TRUE if the mark is visible (i.e. a cursor is displayed
|
||
* for it).
|
||
*
|
||
* Returns: %TRUE if visible
|
||
**/
|
||
gboolean
|
||
gtk_text_mark_get_visible (GtkTextMark *mark)
|
||
{
|
||
GtkTextLineSegment *seg;
|
||
|
||
seg = mark->segment;
|
||
|
||
return seg->body.mark.visible;
|
||
}
|
||
|
||
/**
|
||
* gtk_text_mark_get_name:
|
||
* @mark: a #GtkTextMark
|
||
*
|
||
* Returns the mark name; returns NULL for anonymous marks.
|
||
*
|
||
* Returns: mark name
|
||
**/
|
||
const char *
|
||
gtk_text_mark_get_name (GtkTextMark *mark)
|
||
{
|
||
GtkTextLineSegment *seg;
|
||
|
||
seg = mark->segment;
|
||
|
||
return seg->body.mark.name;
|
||
}
|
||
|
||
/**
|
||
* gtk_text_mark_get_deleted:
|
||
* @mark: a #GtkTextMark
|
||
*
|
||
* Returns %TRUE if the mark has been removed from its buffer
|
||
* with gtk_text_buffer_delete_mark(). See gtk_text_buffer_add_mark()
|
||
* for a way to add it to a buffer again.
|
||
*
|
||
* Returns: whether the mark is deleted
|
||
**/
|
||
gboolean
|
||
gtk_text_mark_get_deleted (GtkTextMark *mark)
|
||
{
|
||
GtkTextLineSegment *seg;
|
||
|
||
g_return_val_if_fail (GTK_IS_TEXT_MARK (mark), FALSE);
|
||
|
||
seg = mark->segment;
|
||
|
||
if (seg == NULL)
|
||
return TRUE;
|
||
|
||
return seg->body.mark.tree == NULL;
|
||
}
|
||
|
||
/**
|
||
* gtk_text_mark_get_buffer:
|
||
* @mark: a #GtkTextMark
|
||
*
|
||
* Gets the buffer this mark is located inside,
|
||
* or %NULL if the mark is deleted.
|
||
*
|
||
* Returns: (transfer none): the mark’s #GtkTextBuffer
|
||
**/
|
||
GtkTextBuffer*
|
||
gtk_text_mark_get_buffer (GtkTextMark *mark)
|
||
{
|
||
GtkTextLineSegment *seg;
|
||
|
||
g_return_val_if_fail (GTK_IS_TEXT_MARK (mark), NULL);
|
||
|
||
seg = mark->segment;
|
||
|
||
if (seg->body.mark.tree == NULL)
|
||
return NULL;
|
||
else
|
||
return _gtk_text_btree_get_buffer (seg->body.mark.tree);
|
||
}
|
||
|
||
/**
|
||
* gtk_text_mark_get_left_gravity:
|
||
* @mark: a #GtkTextMark
|
||
*
|
||
* Determines whether the mark has left gravity.
|
||
*
|
||
* Returns: %TRUE if the mark has left gravity, %FALSE otherwise
|
||
**/
|
||
gboolean
|
||
gtk_text_mark_get_left_gravity (GtkTextMark *mark)
|
||
{
|
||
GtkTextLineSegment *seg;
|
||
|
||
g_return_val_if_fail (GTK_IS_TEXT_MARK (mark), FALSE);
|
||
|
||
seg = mark->segment;
|
||
|
||
return seg->type == >k_text_left_mark_type;
|
||
}
|
||
|
||
static GtkTextLineSegment *
|
||
gtk_mark_segment_new (GtkTextMark *mark_obj)
|
||
{
|
||
GtkTextLineSegment *mark;
|
||
|
||
mark = g_slice_alloc0 (MSEG_SIZE);
|
||
mark->body.mark.name = NULL;
|
||
mark->type = >k_text_right_mark_type;
|
||
|
||
mark->byte_count = 0;
|
||
mark->char_count = 0;
|
||
|
||
mark->body.mark.obj = mark_obj;
|
||
mark_obj->segment = mark;
|
||
|
||
mark->body.mark.tree = NULL;
|
||
mark->body.mark.line = NULL;
|
||
mark->next = NULL;
|
||
|
||
mark->body.mark.visible = FALSE;
|
||
mark->body.mark.not_deleteable = FALSE;
|
||
|
||
return mark;
|
||
}
|
||
|
||
void
|
||
_gtk_mark_segment_set_tree (GtkTextLineSegment *mark,
|
||
GtkTextBTree *tree)
|
||
{
|
||
g_assert (mark->body.mark.tree == NULL);
|
||
g_assert (mark->body.mark.obj != NULL);
|
||
|
||
mark->byte_count = 0;
|
||
mark->char_count = 0;
|
||
|
||
mark->body.mark.tree = tree;
|
||
mark->body.mark.line = NULL;
|
||
mark->next = NULL;
|
||
|
||
mark->body.mark.not_deleteable = FALSE;
|
||
}
|
||
|
||
static int mark_segment_delete_func (GtkTextLineSegment *segPtr,
|
||
GtkTextLine *line,
|
||
int treeGone);
|
||
static GtkTextLineSegment *mark_segment_cleanup_func (GtkTextLineSegment *segPtr,
|
||
GtkTextLine *line);
|
||
static void mark_segment_check_func (GtkTextLineSegment *segPtr,
|
||
GtkTextLine *line);
|
||
|
||
|
||
/*
|
||
* The following structures declare the "mark" segment types.
|
||
* There are actually two types for marks, one with left gravity
|
||
* and one with right gravity. They are identical except for
|
||
* their gravity property.
|
||
*/
|
||
|
||
const GtkTextLineSegmentClass gtk_text_right_mark_type = {
|
||
"mark", /* name */
|
||
FALSE, /* leftGravity */
|
||
NULL, /* splitFunc */
|
||
mark_segment_delete_func, /* deleteFunc */
|
||
mark_segment_cleanup_func, /* cleanupFunc */
|
||
NULL, /* lineChangeFunc */
|
||
mark_segment_check_func /* checkFunc */
|
||
};
|
||
|
||
const GtkTextLineSegmentClass gtk_text_left_mark_type = {
|
||
"mark", /* name */
|
||
TRUE, /* leftGravity */
|
||
NULL, /* splitFunc */
|
||
mark_segment_delete_func, /* deleteFunc */
|
||
mark_segment_cleanup_func, /* cleanupFunc */
|
||
NULL, /* lineChangeFunc */
|
||
mark_segment_check_func /* checkFunc */
|
||
};
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* mark_segment_delete_func --
|
||
*
|
||
* This procedure is invoked by the text B-tree code whenever
|
||
* a mark lies in a range of characters being deleted.
|
||
*
|
||
* Results:
|
||
* Returns 1 to indicate that deletion has been rejected,
|
||
* or 0 otherwise
|
||
*
|
||
* Side effects:
|
||
* Frees mark if tree is going away
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static gboolean
|
||
mark_segment_delete_func (GtkTextLineSegment *seg,
|
||
GtkTextLine *line,
|
||
gboolean tree_gone)
|
||
{
|
||
if (tree_gone)
|
||
{
|
||
_gtk_text_btree_release_mark_segment (seg->body.mark.tree, seg);
|
||
return FALSE;
|
||
}
|
||
else
|
||
return TRUE;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* mark_segment_cleanup_func --
|
||
*
|
||
* This procedure is invoked by the B-tree code whenever a
|
||
* mark segment is moved from one line to another.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* The line field of the segment gets updated.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static GtkTextLineSegment *
|
||
mark_segment_cleanup_func (GtkTextLineSegment *seg,
|
||
GtkTextLine *line)
|
||
{
|
||
/* not sure why Tk did this here and not in LineChangeFunc */
|
||
seg->body.mark.line = line;
|
||
return seg;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* mark_segment_check_func --
|
||
*
|
||
* This procedure is invoked by the B-tree code to perform
|
||
* consistency checks on mark segments.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* The procedure panics if it detects anything wrong with
|
||
* the mark.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
mark_segment_check_func (GtkTextLineSegment *seg,
|
||
GtkTextLine *line)
|
||
{
|
||
if (seg->body.mark.line != line)
|
||
g_error ("mark_segment_check_func: seg->body.mark.line bogus");
|
||
}
|