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gtk3/gtk/gtkscrolledwindow.c
Owen Taylor a6774264ee Initialize the scrollbar spacing variable in the class to -1, and then 
Fri Mar  1 16:48:19 2002  Owen Taylor  <otaylor@redhat.com>

	* gtk/gtkscrolledwindow.c: Initialize the scrollbar spacing
	variable in the class to -1, and then take that to mean
	"default" (3) rather than putting 3 in the class directly.
	This gives us some wiggle room to make it a per-instance
	rather than a per-class property later.
2002-03-01 21:53:22 +00:00

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/* GTK - The GIMP Toolkit
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* 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 <gdk/gdkkeysyms.h>
#include "gtkbindings.h"
#include "gtkmarshalers.h"
#include "gtkscrolledwindow.h"
#include "gtksignal.h"
#include "gtkintl.h"
/* scrolled window policy and size requisition handling:
*
* gtk size requisition works as follows:
* a widget upon size-request reports the width and height that it finds
* to be best suited to display its contents, including children.
* the width and/or height reported from a widget upon size requisition
* may be overidden by the user by specifying a width and/or height
* other than 0 through gtk_widget_set_usize().
*
* a scrolled window needs (for imlementing all three policy types) to
* request its width and height based on two different rationales.
* 1) the user wants the scrolled window to just fit into the space
* that it gets allocated for a specifc dimension.
* 1.1) this does not apply if the user specified a concrete value
* value for that specific dimension by either specifying usize for the
* scrolled window or for its child.
* 2) the user wants the scrolled window to take as much space up as
* is desired by the child for a specifc dimension (i.e. POLICY_NEVER).
*
* also, kinda obvious:
* 3) a user would certainly not have choosen a scrolled window as a container
* for the child, if the resulting allocation takes up more space than the
* child would have allocated without the scrolled window.
*
* conclusions:
* A) from 1) follows: the scrolled window shouldn't request more space for a
* specifc dimension than is required at minimum.
* B) from 1.1) follows: the requisition may be overidden by usize of the scrolled
* window (done automatically) or by usize of the child (needs to be checked).
* C) from 2) follows: for POLICY_NEVER, the scrolled window simply reports the
* child's dimension.
* D) from 3) follows: the scrolled window child's minimum width and minimum height
* under A) at least correspond to the space taken up by its scrollbars.
*/
#define DEFAULT_SCROLLBAR_SPACING 3
#define SCROLLBAR_SPACING(w) \
(GTK_SCROLLED_WINDOW_GET_CLASS (w)->scrollbar_spacing >= 0 ? \
GTK_SCROLLED_WINDOW_GET_CLASS (w)->scrollbar_spacing : DEFAULT_SCROLLBAR_SPACING)
enum {
PROP_0,
PROP_HADJUSTMENT,
PROP_VADJUSTMENT,
PROP_HSCROLLBAR_POLICY,
PROP_VSCROLLBAR_POLICY,
PROP_WINDOW_PLACEMENT,
PROP_SHADOW_TYPE,
PROP_LAST
};
/* Signals */
enum
{
SCROLL_CHILD,
MOVE_FOCUS_OUT,
LAST_SIGNAL
};
static void gtk_scrolled_window_class_init (GtkScrolledWindowClass *klass);
static void gtk_scrolled_window_init (GtkScrolledWindow *scrolled_window);
static void gtk_scrolled_window_destroy (GtkObject *object);
static void gtk_scrolled_window_finalize (GObject *object);
static void gtk_scrolled_window_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec);
static void gtk_scrolled_window_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec);
static gint gtk_scrolled_window_expose (GtkWidget *widget,
GdkEventExpose *event);
static void gtk_scrolled_window_size_request (GtkWidget *widget,
GtkRequisition *requisition);
static void gtk_scrolled_window_size_allocate (GtkWidget *widget,
GtkAllocation *allocation);
static gint gtk_scrolled_window_scroll_event (GtkWidget *widget,
GdkEventScroll *event);
static gint gtk_scrolled_window_focus (GtkWidget *widget,
GtkDirectionType direction);
static void gtk_scrolled_window_add (GtkContainer *container,
GtkWidget *widget);
static void gtk_scrolled_window_remove (GtkContainer *container,
GtkWidget *widget);
static void gtk_scrolled_window_forall (GtkContainer *container,
gboolean include_internals,
GtkCallback callback,
gpointer callback_data);
static void gtk_scrolled_window_scroll_child (GtkScrolledWindow *scrolled_window,
GtkScrollType scroll,
gboolean horizontal);
static void gtk_scrolled_window_move_focus_out (GtkScrolledWindow *scrolled_window,
GtkDirectionType direction_type);
static void gtk_scrolled_window_relative_allocation(GtkWidget *widget,
GtkAllocation *allocation);
static void gtk_scrolled_window_adjustment_changed (GtkAdjustment *adjustment,
gpointer data);
static GtkContainerClass *parent_class = NULL;
static guint signals[LAST_SIGNAL] = {0};
GtkType
gtk_scrolled_window_get_type (void)
{
static GtkType scrolled_window_type = 0;
if (!scrolled_window_type)
{
static const GtkTypeInfo scrolled_window_info =
{
"GtkScrolledWindow",
sizeof (GtkScrolledWindow),
sizeof (GtkScrolledWindowClass),
(GtkClassInitFunc) gtk_scrolled_window_class_init,
(GtkObjectInitFunc) gtk_scrolled_window_init,
/* reserved_1 */ NULL,
/* reserved_2 */ NULL,
(GtkClassInitFunc) NULL,
};
scrolled_window_type = gtk_type_unique (GTK_TYPE_BIN, &scrolled_window_info);
}
return scrolled_window_type;
}
static void
add_scroll_binding (GtkBindingSet *binding_set,
guint keyval,
GdkModifierType mask,
GtkScrollType scroll,
gboolean horizontal)
{
guint keypad_keyval = keyval - GDK_Left + GDK_KP_Left;
gtk_binding_entry_add_signal (binding_set, keyval, mask,
"scroll_child", 2,
GTK_TYPE_SCROLL_TYPE, scroll,
G_TYPE_BOOLEAN, horizontal);
gtk_binding_entry_add_signal (binding_set, keypad_keyval, mask,
"scroll_child", 2,
GTK_TYPE_SCROLL_TYPE, scroll,
G_TYPE_BOOLEAN, horizontal);
}
static void
add_tab_bindings (GtkBindingSet *binding_set,
GdkModifierType modifiers,
GtkDirectionType direction)
{
gtk_binding_entry_add_signal (binding_set, GDK_Tab, modifiers,
"move_focus_out", 1,
GTK_TYPE_DIRECTION_TYPE, direction);
gtk_binding_entry_add_signal (binding_set, GDK_KP_Tab, modifiers,
"move_focus_out", 1,
GTK_TYPE_DIRECTION_TYPE, direction);
}
static void
gtk_scrolled_window_class_init (GtkScrolledWindowClass *class)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (class);
GtkObjectClass *object_class;
GtkWidgetClass *widget_class;
GtkContainerClass *container_class;
GtkBindingSet *binding_set;
object_class = (GtkObjectClass*) class;
widget_class = (GtkWidgetClass*) class;
container_class = (GtkContainerClass*) class;
parent_class = gtk_type_class (GTK_TYPE_BIN);
gobject_class->finalize = gtk_scrolled_window_finalize;
gobject_class->set_property = gtk_scrolled_window_set_property;
gobject_class->get_property = gtk_scrolled_window_get_property;
object_class->destroy = gtk_scrolled_window_destroy;
widget_class->expose_event = gtk_scrolled_window_expose;
widget_class->size_request = gtk_scrolled_window_size_request;
widget_class->size_allocate = gtk_scrolled_window_size_allocate;
widget_class->scroll_event = gtk_scrolled_window_scroll_event;
widget_class->focus = gtk_scrolled_window_focus;
container_class->add = gtk_scrolled_window_add;
container_class->remove = gtk_scrolled_window_remove;
container_class->forall = gtk_scrolled_window_forall;
class->scrollbar_spacing = -1;
class->scroll_child = gtk_scrolled_window_scroll_child;
class->move_focus_out = gtk_scrolled_window_move_focus_out;
g_object_class_install_property (gobject_class,
PROP_HADJUSTMENT,
g_param_spec_object ("hadjustment",
_("Horizontal Adjustment"),
_("The GtkAdjustment for the horizontal position."),
GTK_TYPE_ADJUSTMENT,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
g_object_class_install_property (gobject_class,
PROP_VADJUSTMENT,
g_param_spec_object ("vadjustment",
_("Vertical Adjustment"),
_("The GtkAdjustment for the vertical position."),
GTK_TYPE_ADJUSTMENT,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
g_object_class_install_property (gobject_class,
PROP_HSCROLLBAR_POLICY,
g_param_spec_enum ("hscrollbar_policy",
_("Horizontal Scrollbar Policy"),
_("When the horizontal scrollbar is displayed"),
GTK_TYPE_POLICY_TYPE,
GTK_POLICY_ALWAYS,
G_PARAM_READABLE | G_PARAM_WRITABLE));
g_object_class_install_property (gobject_class,
PROP_VSCROLLBAR_POLICY,
g_param_spec_enum ("vscrollbar_policy",
_("Vertical Scrollbar Policy"),
_("When the vertical scrollbar is displayed"),
GTK_TYPE_POLICY_TYPE,
GTK_POLICY_ALWAYS,
G_PARAM_READABLE | G_PARAM_WRITABLE));
g_object_class_install_property (gobject_class,
PROP_WINDOW_PLACEMENT,
g_param_spec_enum ("window_placement",
_("Window Placement"),
_("Where the contents are located with respect to the scrollbars"),
GTK_TYPE_CORNER_TYPE,
GTK_CORNER_TOP_LEFT,
G_PARAM_READABLE | G_PARAM_WRITABLE));
g_object_class_install_property (gobject_class,
PROP_SHADOW_TYPE,
g_param_spec_enum ("shadow_type",
_("Shadow Type"),
_("Style of bevel around the contents"),
GTK_TYPE_SHADOW_TYPE,
GTK_SHADOW_NONE,
G_PARAM_READABLE | G_PARAM_WRITABLE));
signals[SCROLL_CHILD] =
g_signal_new ("scroll_child",
G_TYPE_FROM_CLASS (object_class),
G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
G_STRUCT_OFFSET (GtkScrolledWindowClass, scroll_child),
NULL, NULL,
_gtk_marshal_VOID__ENUM_BOOLEAN,
G_TYPE_NONE, 2,
GTK_TYPE_SCROLL_TYPE,
G_TYPE_BOOLEAN);
signals[MOVE_FOCUS_OUT] =
g_signal_new ("move_focus_out",
G_TYPE_FROM_CLASS (object_class),
G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
G_STRUCT_OFFSET (GtkScrolledWindowClass, move_focus_out),
NULL, NULL,
_gtk_marshal_VOID__ENUM,
G_TYPE_NONE, 1,
GTK_TYPE_DIRECTION_TYPE);
binding_set = gtk_binding_set_by_class (class);
add_scroll_binding (binding_set, GDK_Left, GDK_CONTROL_MASK, GTK_SCROLL_STEP_BACKWARD, TRUE);
add_scroll_binding (binding_set, GDK_Right, GDK_CONTROL_MASK, GTK_SCROLL_STEP_FORWARD, TRUE);
add_scroll_binding (binding_set, GDK_Up, GDK_CONTROL_MASK, GTK_SCROLL_STEP_BACKWARD, FALSE);
add_scroll_binding (binding_set, GDK_Down, GDK_CONTROL_MASK, GTK_SCROLL_STEP_FORWARD, FALSE);
add_scroll_binding (binding_set, GDK_Page_Up, GDK_CONTROL_MASK, GTK_SCROLL_PAGE_BACKWARD, TRUE);
add_scroll_binding (binding_set, GDK_Page_Down, GDK_CONTROL_MASK, GTK_SCROLL_PAGE_FORWARD, TRUE);
add_scroll_binding (binding_set, GDK_Page_Up, 0, GTK_SCROLL_PAGE_BACKWARD, FALSE);
add_scroll_binding (binding_set, GDK_Page_Down, 0, GTK_SCROLL_PAGE_FORWARD, FALSE);
add_scroll_binding (binding_set, GDK_Home, GDK_CONTROL_MASK, GTK_SCROLL_START, TRUE);
add_scroll_binding (binding_set, GDK_End, GDK_CONTROL_MASK, GTK_SCROLL_END, TRUE);
add_scroll_binding (binding_set, GDK_Home, 0, GTK_SCROLL_START, FALSE);
add_scroll_binding (binding_set, GDK_End, 0, GTK_SCROLL_END, FALSE);
add_tab_bindings (binding_set, GDK_CONTROL_MASK, GTK_DIR_TAB_FORWARD);
add_tab_bindings (binding_set, GDK_CONTROL_MASK | GDK_SHIFT_MASK, GTK_DIR_TAB_BACKWARD);
}
static void
gtk_scrolled_window_init (GtkScrolledWindow *scrolled_window)
{
GTK_WIDGET_SET_FLAGS (scrolled_window, GTK_NO_WINDOW | GTK_CAN_FOCUS);
gtk_container_set_resize_mode (GTK_CONTAINER (scrolled_window), GTK_RESIZE_QUEUE);
scrolled_window->hscrollbar = NULL;
scrolled_window->vscrollbar = NULL;
scrolled_window->hscrollbar_policy = GTK_POLICY_ALWAYS;
scrolled_window->vscrollbar_policy = GTK_POLICY_ALWAYS;
scrolled_window->hscrollbar_visible = FALSE;
scrolled_window->vscrollbar_visible = FALSE;
scrolled_window->focus_out = FALSE;
scrolled_window->window_placement = GTK_CORNER_TOP_LEFT;
}
GtkWidget*
gtk_scrolled_window_new (GtkAdjustment *hadjustment,
GtkAdjustment *vadjustment)
{
GtkWidget *scrolled_window;
if (hadjustment)
g_return_val_if_fail (GTK_IS_ADJUSTMENT (hadjustment), NULL);
if (vadjustment)
g_return_val_if_fail (GTK_IS_ADJUSTMENT (vadjustment), NULL);
scrolled_window = gtk_widget_new (GTK_TYPE_SCROLLED_WINDOW,
"hadjustment", hadjustment,
"vadjustment", vadjustment,
NULL);
return scrolled_window;
}
void
gtk_scrolled_window_set_hadjustment (GtkScrolledWindow *scrolled_window,
GtkAdjustment *hadjustment)
{
GtkBin *bin;
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
if (hadjustment)
g_return_if_fail (GTK_IS_ADJUSTMENT (hadjustment));
else
hadjustment = (GtkAdjustment*) gtk_object_new (GTK_TYPE_ADJUSTMENT, NULL);
bin = GTK_BIN (scrolled_window);
if (!scrolled_window->hscrollbar)
{
gtk_widget_push_composite_child ();
scrolled_window->hscrollbar = gtk_hscrollbar_new (hadjustment);
gtk_widget_set_composite_name (scrolled_window->hscrollbar, "hscrollbar");
gtk_widget_pop_composite_child ();
gtk_widget_set_parent (scrolled_window->hscrollbar, GTK_WIDGET (scrolled_window));
gtk_widget_ref (scrolled_window->hscrollbar);
gtk_widget_show (scrolled_window->hscrollbar);
}
else
{
GtkAdjustment *old_adjustment;
old_adjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar));
if (old_adjustment == hadjustment)
return;
gtk_signal_disconnect_by_func (GTK_OBJECT (old_adjustment),
GTK_SIGNAL_FUNC (gtk_scrolled_window_adjustment_changed),
scrolled_window);
gtk_range_set_adjustment (GTK_RANGE (scrolled_window->hscrollbar),
hadjustment);
}
hadjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar));
gtk_signal_connect (GTK_OBJECT (hadjustment),
"changed",
GTK_SIGNAL_FUNC (gtk_scrolled_window_adjustment_changed),
scrolled_window);
gtk_scrolled_window_adjustment_changed (hadjustment, scrolled_window);
if (bin->child)
gtk_widget_set_scroll_adjustments (bin->child,
gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)),
gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar)));
g_object_notify (G_OBJECT (scrolled_window), "hadjustment");
}
void
gtk_scrolled_window_set_vadjustment (GtkScrolledWindow *scrolled_window,
GtkAdjustment *vadjustment)
{
GtkBin *bin;
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
if (vadjustment)
g_return_if_fail (GTK_IS_ADJUSTMENT (vadjustment));
else
vadjustment = (GtkAdjustment*) gtk_object_new (GTK_TYPE_ADJUSTMENT, NULL);
bin = GTK_BIN (scrolled_window);
if (!scrolled_window->vscrollbar)
{
gtk_widget_push_composite_child ();
scrolled_window->vscrollbar = gtk_vscrollbar_new (vadjustment);
gtk_widget_set_composite_name (scrolled_window->vscrollbar, "vscrollbar");
gtk_widget_pop_composite_child ();
gtk_widget_set_parent (scrolled_window->vscrollbar, GTK_WIDGET (scrolled_window));
gtk_widget_ref (scrolled_window->vscrollbar);
gtk_widget_show (scrolled_window->vscrollbar);
}
else
{
GtkAdjustment *old_adjustment;
old_adjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar));
if (old_adjustment == vadjustment)
return;
gtk_signal_disconnect_by_func (GTK_OBJECT (old_adjustment),
GTK_SIGNAL_FUNC (gtk_scrolled_window_adjustment_changed),
scrolled_window);
gtk_range_set_adjustment (GTK_RANGE (scrolled_window->vscrollbar),
vadjustment);
}
vadjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar));
gtk_signal_connect (GTK_OBJECT (vadjustment),
"changed",
GTK_SIGNAL_FUNC (gtk_scrolled_window_adjustment_changed),
scrolled_window);
gtk_scrolled_window_adjustment_changed (vadjustment, scrolled_window);
if (bin->child)
gtk_widget_set_scroll_adjustments (bin->child,
gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)),
gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar)));
g_object_notify (G_OBJECT (scrolled_window), "vadjustment");
}
GtkAdjustment*
gtk_scrolled_window_get_hadjustment (GtkScrolledWindow *scrolled_window)
{
g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
return (scrolled_window->hscrollbar ?
gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)) :
NULL);
}
GtkAdjustment*
gtk_scrolled_window_get_vadjustment (GtkScrolledWindow *scrolled_window)
{
g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
return (scrolled_window->vscrollbar ?
gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar)) :
NULL);
}
void
gtk_scrolled_window_set_policy (GtkScrolledWindow *scrolled_window,
GtkPolicyType hscrollbar_policy,
GtkPolicyType vscrollbar_policy)
{
GObject *object = G_OBJECT (scrolled_window);
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
if ((scrolled_window->hscrollbar_policy != hscrollbar_policy) ||
(scrolled_window->vscrollbar_policy != vscrollbar_policy))
{
scrolled_window->hscrollbar_policy = hscrollbar_policy;
scrolled_window->vscrollbar_policy = vscrollbar_policy;
gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
g_object_freeze_notify (object);
g_object_notify (object, "hscrollbar_policy");
g_object_notify (object, "vscrollbar_policy");
g_object_thaw_notify (object);
}
}
/**
* gtk_scrolled_window_get_policy:
* @scrolled_window: a #GtkScrolledWindow
* @hscrollbar_policy: location to store the policy for the horizontal scrollbar, or %NULL.
* @vscrollbar_policy: location to store the policy for the horizontal scrollbar, or %NULL.
*
* Retrieves the current policy values for the horizontal and vertical
* scrollbars. See gtk_scrolled_window_set_policy().
**/
void
gtk_scrolled_window_get_policy (GtkScrolledWindow *scrolled_window,
GtkPolicyType *hscrollbar_policy,
GtkPolicyType *vscrollbar_policy)
{
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
if (hscrollbar_policy)
*hscrollbar_policy = scrolled_window->hscrollbar_policy;
if (vscrollbar_policy)
*vscrollbar_policy = scrolled_window->vscrollbar_policy;
}
void
gtk_scrolled_window_set_placement (GtkScrolledWindow *scrolled_window,
GtkCornerType window_placement)
{
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
if (scrolled_window->window_placement != window_placement)
{
scrolled_window->window_placement = window_placement;
gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
g_object_notify (G_OBJECT (scrolled_window), "window_placement");
}
}
/**
* gtk_scrolled_window_get_placement:
* @scrolled_window: a #GtkScrolledWindow
*
* Gets the placement of the scrollbars for the scrolled window. See
* gtk_scrolled_window_set_placement().
*
* Return value: the current placement value.
**/
GtkCornerType
gtk_scrolled_window_get_placement (GtkScrolledWindow *scrolled_window)
{
g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), GTK_CORNER_TOP_LEFT);
return scrolled_window->window_placement;
}
/**
* gtk_scrolled_window_set_shadow_type:
* @scrolled_window: a #GtkScrolledWindow
* @type: kind of shadow to draw around scrolled window contents
*
* Changes the type of shadow drawn around the contents of
* @scrolled_window.
*
**/
void
gtk_scrolled_window_set_shadow_type (GtkScrolledWindow *scrolled_window,
GtkShadowType type)
{
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
g_return_if_fail (type >= GTK_SHADOW_NONE && type <= GTK_SHADOW_ETCHED_OUT);
if (scrolled_window->shadow_type != type)
{
scrolled_window->shadow_type = type;
if (GTK_WIDGET_DRAWABLE (scrolled_window))
gtk_widget_queue_clear (GTK_WIDGET (scrolled_window));
gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
g_object_notify (G_OBJECT (scrolled_window), "shadow_type");
}
}
/**
* gtk_scrolled_window_get_shadow_type:
* @scrolled_window: a #GtkScrolledWindow
*
* Gets the shadow type of the scrolled window. See
* gtk_scrolled_window_set_shadow_type().
*
* Return value: the current shadow type
**/
GtkShadowType
gtk_scrolled_window_get_shadow_type (GtkScrolledWindow *scrolled_window)
{
g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), GTK_SHADOW_NONE);
return scrolled_window->shadow_type;
}
static void
gtk_scrolled_window_destroy (GtkObject *object)
{
GtkScrolledWindow *scrolled_window;
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (object));
scrolled_window = GTK_SCROLLED_WINDOW (object);
gtk_widget_unparent (scrolled_window->hscrollbar);
gtk_widget_unparent (scrolled_window->vscrollbar);
gtk_widget_destroy (scrolled_window->hscrollbar);
gtk_widget_destroy (scrolled_window->vscrollbar);
GTK_OBJECT_CLASS (parent_class)->destroy (object);
}
static void
gtk_scrolled_window_finalize (GObject *object)
{
GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (object);
gtk_widget_unref (scrolled_window->hscrollbar);
gtk_widget_unref (scrolled_window->vscrollbar);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gtk_scrolled_window_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (object);
switch (prop_id)
{
case PROP_HADJUSTMENT:
gtk_scrolled_window_set_hadjustment (scrolled_window,
g_value_get_object (value));
break;
case PROP_VADJUSTMENT:
gtk_scrolled_window_set_vadjustment (scrolled_window,
g_value_get_object (value));
break;
case PROP_HSCROLLBAR_POLICY:
gtk_scrolled_window_set_policy (scrolled_window,
g_value_get_enum (value),
scrolled_window->vscrollbar_policy);
break;
case PROP_VSCROLLBAR_POLICY:
gtk_scrolled_window_set_policy (scrolled_window,
scrolled_window->hscrollbar_policy,
g_value_get_enum (value));
break;
case PROP_WINDOW_PLACEMENT:
gtk_scrolled_window_set_placement (scrolled_window,
g_value_get_enum (value));
break;
case PROP_SHADOW_TYPE:
gtk_scrolled_window_set_shadow_type (scrolled_window,
g_value_get_enum (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gtk_scrolled_window_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (object);
switch (prop_id)
{
case PROP_HADJUSTMENT:
g_value_set_object (value,
G_OBJECT (gtk_scrolled_window_get_hadjustment (scrolled_window)));
break;
case PROP_VADJUSTMENT:
g_value_set_object (value,
G_OBJECT (gtk_scrolled_window_get_vadjustment (scrolled_window)));
break;
case PROP_HSCROLLBAR_POLICY:
g_value_set_enum (value, scrolled_window->hscrollbar_policy);
break;
case PROP_VSCROLLBAR_POLICY:
g_value_set_enum (value, scrolled_window->vscrollbar_policy);
break;
case PROP_WINDOW_PLACEMENT:
g_value_set_enum (value, scrolled_window->window_placement);
break;
case PROP_SHADOW_TYPE:
g_value_set_enum (value, scrolled_window->shadow_type);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gtk_scrolled_window_paint (GtkWidget *widget,
GdkRectangle *area)
{
GtkAllocation relative_allocation;
GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
{
gtk_scrolled_window_relative_allocation (widget, &relative_allocation);
relative_allocation.x -= widget->style->xthickness;
relative_allocation.y -= widget->style->ythickness;
relative_allocation.width += 2 * widget->style->xthickness;
relative_allocation.height += 2 * widget->style->ythickness;
gtk_paint_shadow (widget->style, widget->window,
GTK_STATE_NORMAL, scrolled_window->shadow_type,
area, widget, "scrolled_window",
widget->allocation.x + relative_allocation.x,
widget->allocation.y + relative_allocation.y,
relative_allocation.width,
relative_allocation.height);
}
}
static gint
gtk_scrolled_window_expose (GtkWidget *widget,
GdkEventExpose *event)
{
if (GTK_WIDGET_DRAWABLE (widget))
{
gtk_scrolled_window_paint (widget, &event->area);
(* GTK_WIDGET_CLASS (parent_class)->expose_event) (widget, event);
}
return FALSE;
}
static void
gtk_scrolled_window_forall (GtkContainer *container,
gboolean include_internals,
GtkCallback callback,
gpointer callback_data)
{
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (container));
g_return_if_fail (callback != NULL);
GTK_CONTAINER_CLASS (parent_class)->forall (container,
include_internals,
callback,
callback_data);
if (include_internals)
{
GtkScrolledWindow *scrolled_window;
scrolled_window = GTK_SCROLLED_WINDOW (container);
if (scrolled_window->vscrollbar)
callback (scrolled_window->vscrollbar, callback_data);
if (scrolled_window->hscrollbar)
callback (scrolled_window->hscrollbar, callback_data);
}
}
static void
gtk_scrolled_window_scroll_child (GtkScrolledWindow *scrolled_window,
GtkScrollType scroll,
gboolean horizontal)
{
GtkAdjustment *adjustment = NULL;
switch (scroll)
{
case GTK_SCROLL_STEP_UP:
scroll = GTK_SCROLL_STEP_BACKWARD;
horizontal = FALSE;
break;
case GTK_SCROLL_STEP_DOWN:
scroll = GTK_SCROLL_STEP_FORWARD;
horizontal = FALSE;
break;
case GTK_SCROLL_STEP_LEFT:
scroll = GTK_SCROLL_STEP_BACKWARD;
horizontal = TRUE;
break;
case GTK_SCROLL_STEP_RIGHT:
scroll = GTK_SCROLL_STEP_FORWARD;
horizontal = TRUE;
break;
case GTK_SCROLL_PAGE_UP:
scroll = GTK_SCROLL_PAGE_BACKWARD;
horizontal = FALSE;
break;
case GTK_SCROLL_PAGE_DOWN:
scroll = GTK_SCROLL_PAGE_FORWARD;
horizontal = FALSE;
break;
case GTK_SCROLL_PAGE_LEFT:
scroll = GTK_SCROLL_STEP_BACKWARD;
horizontal = TRUE;
break;
case GTK_SCROLL_PAGE_RIGHT:
scroll = GTK_SCROLL_STEP_FORWARD;
horizontal = TRUE;
break;
case GTK_SCROLL_STEP_BACKWARD:
case GTK_SCROLL_STEP_FORWARD:
case GTK_SCROLL_PAGE_BACKWARD:
case GTK_SCROLL_PAGE_FORWARD:
case GTK_SCROLL_START:
case GTK_SCROLL_END:
break;
default:
g_warning ("Invalid scroll type %d for GtkSpinButton::change-value", scroll);
return;
}
if (horizontal)
{
if (scrolled_window->hscrollbar)
adjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar));
}
else
{
if (scrolled_window->vscrollbar)
adjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar));
}
if (adjustment)
{
gdouble value = adjustment->value;
switch (scroll)
{
case GTK_SCROLL_STEP_FORWARD:
value += adjustment->step_increment;
break;
case GTK_SCROLL_STEP_BACKWARD:
value -= adjustment->step_increment;
break;
case GTK_SCROLL_PAGE_FORWARD:
value += adjustment->page_increment;
break;
case GTK_SCROLL_PAGE_BACKWARD:
value -= adjustment->page_increment;
break;
case GTK_SCROLL_START:
value = adjustment->lower;
break;
case GTK_SCROLL_END:
value = adjustment->upper;
break;
default:
g_assert_not_reached ();
break;
}
value = CLAMP (value, adjustment->lower, adjustment->upper - adjustment->page_size);
gtk_adjustment_set_value (adjustment, value);
}
}
static void
gtk_scrolled_window_move_focus_out (GtkScrolledWindow *scrolled_window,
GtkDirectionType direction_type)
{
GtkWidget *toplevel;
/* Focus out of the scrolled window entirely. We do this by setting
* a flag, then propagating the focus motion to the notebook.
*/
toplevel = gtk_widget_get_toplevel (GTK_WIDGET (scrolled_window));
if (!GTK_WIDGET_TOPLEVEL (toplevel))
return;
g_object_ref (scrolled_window);
scrolled_window->focus_out = TRUE;
g_signal_emit_by_name (G_OBJECT (toplevel), "move_focus", direction_type);
scrolled_window->focus_out = FALSE;
g_object_unref (scrolled_window);
}
static void
gtk_scrolled_window_size_request (GtkWidget *widget,
GtkRequisition *requisition)
{
GtkScrolledWindow *scrolled_window;
GtkBin *bin;
gint extra_width;
gint extra_height;
GtkRequisition hscrollbar_requisition;
GtkRequisition vscrollbar_requisition;
GtkRequisition child_requisition;
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (widget));
g_return_if_fail (requisition != NULL);
scrolled_window = GTK_SCROLLED_WINDOW (widget);
bin = GTK_BIN (scrolled_window);
extra_width = 0;
extra_height = 0;
requisition->width = 0;
requisition->height = 0;
gtk_widget_size_request (scrolled_window->hscrollbar,
&hscrollbar_requisition);
gtk_widget_size_request (scrolled_window->vscrollbar,
&vscrollbar_requisition);
if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
{
gtk_widget_size_request (bin->child, &child_requisition);
if (scrolled_window->hscrollbar_policy == GTK_POLICY_NEVER)
requisition->width += child_requisition.width;
else
{
GtkWidgetAuxInfo *aux_info = _gtk_widget_get_aux_info (bin->child, FALSE);
if (aux_info && aux_info->width > 0)
{
requisition->width += aux_info->width;
extra_width = -1;
}
else
requisition->width += vscrollbar_requisition.width;
}
if (scrolled_window->vscrollbar_policy == GTK_POLICY_NEVER)
requisition->height += child_requisition.height;
else
{
GtkWidgetAuxInfo *aux_info = _gtk_widget_get_aux_info (bin->child, FALSE);
if (aux_info && aux_info->height > 0)
{
requisition->height += aux_info->height;
extra_height = -1;
}
else
requisition->height += hscrollbar_requisition.height;
}
}
if (scrolled_window->hscrollbar_policy == GTK_POLICY_AUTOMATIC ||
scrolled_window->hscrollbar_policy == GTK_POLICY_ALWAYS)
{
requisition->width = MAX (requisition->width, hscrollbar_requisition.width);
if (!extra_height || scrolled_window->hscrollbar_policy == GTK_POLICY_ALWAYS)
extra_height = SCROLLBAR_SPACING (scrolled_window) + hscrollbar_requisition.height;
}
if (scrolled_window->vscrollbar_policy == GTK_POLICY_AUTOMATIC ||
scrolled_window->vscrollbar_policy == GTK_POLICY_ALWAYS)
{
requisition->height = MAX (requisition->height, vscrollbar_requisition.height);
if (!extra_height || scrolled_window->vscrollbar_policy == GTK_POLICY_ALWAYS)
extra_width = SCROLLBAR_SPACING (scrolled_window) + vscrollbar_requisition.width;
}
requisition->width += GTK_CONTAINER (widget)->border_width * 2 + MAX (0, extra_width);
requisition->height += GTK_CONTAINER (widget)->border_width * 2 + MAX (0, extra_height);
if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
{
requisition->width += 2 * widget->style->xthickness;
requisition->height += 2 * widget->style->ythickness;
}
}
static void
gtk_scrolled_window_relative_allocation (GtkWidget *widget,
GtkAllocation *allocation)
{
GtkScrolledWindow *scrolled_window;
g_return_if_fail (widget != NULL);
g_return_if_fail (allocation != NULL);
scrolled_window = GTK_SCROLLED_WINDOW (widget);
allocation->x = GTK_CONTAINER (widget)->border_width;
allocation->y = GTK_CONTAINER (widget)->border_width;
if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
{
allocation->x += widget->style->xthickness;
allocation->y += widget->style->ythickness;
}
allocation->width = MAX (1, (gint)widget->allocation.width - allocation->x * 2);
allocation->height = MAX (1, (gint)widget->allocation.height - allocation->y * 2);
if (scrolled_window->vscrollbar_visible)
{
GtkRequisition vscrollbar_requisition;
gtk_widget_get_child_requisition (scrolled_window->vscrollbar,
&vscrollbar_requisition);
if (scrolled_window->window_placement == GTK_CORNER_TOP_RIGHT ||
scrolled_window->window_placement == GTK_CORNER_BOTTOM_RIGHT)
allocation->x += (vscrollbar_requisition.width +
SCROLLBAR_SPACING (scrolled_window));
allocation->width = MAX (1, (gint)allocation->width -
((gint)vscrollbar_requisition.width +
(gint)SCROLLBAR_SPACING (scrolled_window)));
}
if (scrolled_window->hscrollbar_visible)
{
GtkRequisition hscrollbar_requisition;
gtk_widget_get_child_requisition (scrolled_window->hscrollbar,
&hscrollbar_requisition);
if (scrolled_window->window_placement == GTK_CORNER_BOTTOM_LEFT ||
scrolled_window->window_placement == GTK_CORNER_BOTTOM_RIGHT)
allocation->y += (hscrollbar_requisition.height +
SCROLLBAR_SPACING (scrolled_window));
allocation->height = MAX (1, (gint)allocation->height -
((gint)hscrollbar_requisition.height +
(gint)SCROLLBAR_SPACING (scrolled_window)));
}
}
static void
gtk_scrolled_window_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
GtkScrolledWindow *scrolled_window;
GtkBin *bin;
GtkAllocation relative_allocation;
GtkAllocation child_allocation;
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (widget));
g_return_if_fail (allocation != NULL);
scrolled_window = GTK_SCROLLED_WINDOW (widget);
bin = GTK_BIN (scrolled_window);
widget->allocation = *allocation;
if (scrolled_window->hscrollbar_policy == GTK_POLICY_ALWAYS)
scrolled_window->hscrollbar_visible = TRUE;
else if (scrolled_window->hscrollbar_policy == GTK_POLICY_NEVER)
scrolled_window->hscrollbar_visible = FALSE;
if (scrolled_window->vscrollbar_policy == GTK_POLICY_ALWAYS)
scrolled_window->vscrollbar_visible = TRUE;
else if (scrolled_window->vscrollbar_policy == GTK_POLICY_NEVER)
scrolled_window->vscrollbar_visible = FALSE;
if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
{
gboolean previous_hvis;
gboolean previous_vvis;
guint count = 0;
do
{
gtk_scrolled_window_relative_allocation (widget, &relative_allocation);
child_allocation.x = relative_allocation.x + allocation->x;
child_allocation.y = relative_allocation.y + allocation->y;
child_allocation.width = relative_allocation.width;
child_allocation.height = relative_allocation.height;
previous_hvis = scrolled_window->hscrollbar_visible;
previous_vvis = scrolled_window->vscrollbar_visible;
gtk_widget_size_allocate (bin->child, &child_allocation);
/* If, after the first iteration, the hscrollbar and the
* vscrollbar flip visiblity, then we need both.
*/
if (count &&
previous_hvis != scrolled_window->hscrollbar_visible &&
previous_vvis != scrolled_window->vscrollbar_visible)
{
scrolled_window->hscrollbar_visible = TRUE;
scrolled_window->vscrollbar_visible = TRUE;
/* a new resize is already queued at this point,
* so we will immediatedly get reinvoked
*/
return;
}
count++;
}
while (previous_hvis != scrolled_window->hscrollbar_visible ||
previous_vvis != scrolled_window->vscrollbar_visible);
}
else
gtk_scrolled_window_relative_allocation (widget, &relative_allocation);
if (scrolled_window->hscrollbar_visible)
{
GtkRequisition hscrollbar_requisition;
gtk_widget_get_child_requisition (scrolled_window->hscrollbar,
&hscrollbar_requisition);
if (!GTK_WIDGET_VISIBLE (scrolled_window->hscrollbar))
gtk_widget_show (scrolled_window->hscrollbar);
child_allocation.x = relative_allocation.x;
if (scrolled_window->window_placement == GTK_CORNER_TOP_LEFT ||
scrolled_window->window_placement == GTK_CORNER_TOP_RIGHT)
child_allocation.y = (relative_allocation.y +
relative_allocation.height +
SCROLLBAR_SPACING (scrolled_window) +
(scrolled_window->shadow_type == GTK_SHADOW_NONE ?
0 : widget->style->ythickness));
else
child_allocation.y = GTK_CONTAINER (scrolled_window)->border_width;
child_allocation.width = relative_allocation.width;
child_allocation.height = hscrollbar_requisition.height;
child_allocation.x += allocation->x;
child_allocation.y += allocation->y;
if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
{
child_allocation.x -= widget->style->xthickness;
child_allocation.width += 2 * widget->style->xthickness;
}
gtk_widget_size_allocate (scrolled_window->hscrollbar, &child_allocation);
}
else if (GTK_WIDGET_VISIBLE (scrolled_window->hscrollbar))
gtk_widget_hide (scrolled_window->hscrollbar);
if (scrolled_window->vscrollbar_visible)
{
GtkRequisition vscrollbar_requisition;
if (!GTK_WIDGET_VISIBLE (scrolled_window->vscrollbar))
gtk_widget_show (scrolled_window->vscrollbar);
gtk_widget_get_child_requisition (scrolled_window->vscrollbar,
&vscrollbar_requisition);
if (scrolled_window->window_placement == GTK_CORNER_TOP_LEFT ||
scrolled_window->window_placement == GTK_CORNER_BOTTOM_LEFT)
child_allocation.x = (relative_allocation.x +
relative_allocation.width +
SCROLLBAR_SPACING (scrolled_window) +
(scrolled_window->shadow_type == GTK_SHADOW_NONE ?
0 : widget->style->xthickness));
else
child_allocation.x = GTK_CONTAINER (scrolled_window)->border_width;
child_allocation.y = relative_allocation.y;
child_allocation.width = vscrollbar_requisition.width;
child_allocation.height = relative_allocation.height;
child_allocation.x += allocation->x;
child_allocation.y += allocation->y;
if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
{
child_allocation.y -= widget->style->ythickness;
child_allocation.height += 2 * widget->style->ythickness;
}
gtk_widget_size_allocate (scrolled_window->vscrollbar, &child_allocation);
}
else if (GTK_WIDGET_VISIBLE (scrolled_window->vscrollbar))
gtk_widget_hide (scrolled_window->vscrollbar);
}
static gint
gtk_scrolled_window_scroll_event (GtkWidget *widget,
GdkEventScroll *event)
{
GtkWidget *range;
g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (widget), FALSE);
g_return_val_if_fail (event != NULL, FALSE);
if (event->direction == GDK_SCROLL_UP || event->direction == GDK_SCROLL_DOWN)
range = GTK_SCROLLED_WINDOW (widget)->vscrollbar;
else
range = GTK_SCROLLED_WINDOW (widget)->hscrollbar;
if (range && GTK_WIDGET_VISIBLE (range))
{
GtkAdjustment *adj = GTK_RANGE (range)->adjustment;
gdouble new_value;
if (event->direction == GDK_SCROLL_UP || event->direction == GDK_SCROLL_LEFT)
new_value = adj->value - adj->page_increment / 2;
else
new_value = adj->value + adj->page_increment / 2;
new_value = CLAMP (new_value, adj->lower, adj->upper - adj->page_size);
gtk_adjustment_set_value (adj, new_value);
return TRUE;
}
return FALSE;
}
static gint
gtk_scrolled_window_focus (GtkWidget *widget,
GtkDirectionType direction)
{
GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
gboolean had_focus_child = GTK_CONTAINER (widget)->focus_child != NULL;
if (scrolled_window->focus_out)
{
scrolled_window->focus_out = FALSE; /* Clear this to catch the wrap-around case */
return FALSE;
}
if (gtk_widget_is_focus (widget))
return FALSE;
/* We only put the scrolled window itself in the focus chain if it
* isn't possible to focus any children.
*/
if (GTK_BIN (widget)->child)
{
if (gtk_widget_child_focus (GTK_BIN (widget)->child, direction))
return TRUE;
}
if (!had_focus_child)
{
gtk_widget_grab_focus (widget);
return TRUE;
}
else
return FALSE;
}
static void
gtk_scrolled_window_adjustment_changed (GtkAdjustment *adjustment,
gpointer data)
{
GtkScrolledWindow *scrolled_win;
g_return_if_fail (adjustment != NULL);
g_return_if_fail (data != NULL);
scrolled_win = GTK_SCROLLED_WINDOW (data);
if (scrolled_win->hscrollbar &&
adjustment == gtk_range_get_adjustment (GTK_RANGE (scrolled_win->hscrollbar)))
{
if (scrolled_win->hscrollbar_policy == GTK_POLICY_AUTOMATIC)
{
gboolean visible;
visible = scrolled_win->hscrollbar_visible;
scrolled_win->hscrollbar_visible = (adjustment->upper - adjustment->lower >
adjustment->page_size);
if (scrolled_win->hscrollbar_visible != visible)
gtk_widget_queue_resize (GTK_WIDGET (scrolled_win));
}
}
else if (scrolled_win->vscrollbar &&
adjustment == gtk_range_get_adjustment (GTK_RANGE (scrolled_win->vscrollbar)))
{
if (scrolled_win->vscrollbar_policy == GTK_POLICY_AUTOMATIC)
{
gboolean visible;
visible = scrolled_win->vscrollbar_visible;
scrolled_win->vscrollbar_visible = (adjustment->upper - adjustment->lower >
adjustment->page_size);
if (scrolled_win->vscrollbar_visible != visible)
gtk_widget_queue_resize (GTK_WIDGET (scrolled_win));
}
}
}
static void
gtk_scrolled_window_add (GtkContainer *container,
GtkWidget *child)
{
GtkScrolledWindow *scrolled_window;
GtkBin *bin;
bin = GTK_BIN (container);
g_return_if_fail (bin->child == NULL);
scrolled_window = GTK_SCROLLED_WINDOW (container);
bin->child = child;
gtk_widget_set_parent (child, GTK_WIDGET (bin));
/* this is a temporary message */
if (!gtk_widget_set_scroll_adjustments (child,
gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)),
gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar))))
g_warning ("gtk_scrolled_window_add(): cannot add non scrollable widget "
"use gtk_scrolled_window_add_with_viewport() instead");
}
static void
gtk_scrolled_window_remove (GtkContainer *container,
GtkWidget *child)
{
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (container));
g_return_if_fail (child != NULL);
g_return_if_fail (GTK_BIN (container)->child == child);
gtk_widget_set_scroll_adjustments (child, NULL, NULL);
/* chain parent class handler to remove child */
GTK_CONTAINER_CLASS (parent_class)->remove (container, child);
}
void
gtk_scrolled_window_add_with_viewport (GtkScrolledWindow *scrolled_window,
GtkWidget *child)
{
GtkBin *bin;
GtkWidget *viewport;
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
g_return_if_fail (GTK_IS_WIDGET (child));
g_return_if_fail (child->parent == NULL);
bin = GTK_BIN (scrolled_window);
if (bin->child != NULL)
{
g_return_if_fail (GTK_IS_VIEWPORT (bin->child));
g_return_if_fail (GTK_BIN (bin->child)->child == NULL);
viewport = bin->child;
}
else
{
viewport =
gtk_viewport_new (gtk_scrolled_window_get_hadjustment (scrolled_window),
gtk_scrolled_window_get_vadjustment (scrolled_window));
gtk_container_add (GTK_CONTAINER (scrolled_window), viewport);
}
gtk_widget_show (viewport);
gtk_container_add (GTK_CONTAINER (viewport), child);
}
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