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gtk2/gtk/gtkmenu.c
Owen Taylor fbfc305174 Allow %NULL for style to mean "revert to default style" 
Tue Jun 26 19:39:03 2001  Owen Taylor  <otaylor@redhat.com>

	* gtk/gtkwidget.c (gtk_widget_set_style): Allow %NULL
	for style to mean "revert to default style"

	* gtk/gtkwidget.[ch] (gtk_widget_set_rc_style,
	  gtk_widget_restore_default_style): Make this functions
	deprecated aliases for gtk_widget_set_style (widget, NULL).

	* gtk/gtkwidget.[ch]: Remove:
	   gtk_widget_set_default_style ()
	   gtk_widget_push_style ()
	   gtk_widget_pop_style ()
	These functions interact are overriden by RC files, and
	thus virtually useless, and complicated.

Fri Jun 22 18:49:48 2001  Owen Taylor  <otaylor@redhat.com>

        * gtk/gtkrc.c: Add a GtkRcContext structure to hold
	most of the previous global variables in gtkrc.c. This is
	in preparation for multi-head, since each screen can
	have different GtkSettings and RC information.

	* gtk/gtkrc.[ch]:

	* gtk/gtkrc.h (struct _GtkRcStyleClass): Add a
	GtkSettings parameter to GtkRcStyle::parse.

	* gdk/x11/gdkevents-x11.c gtk/gtksettings.c gtk/gtkrc.c:
	Add two new settings gtk-theme-name, gtk-key-theme-name,
	for RC files that are loaded by name after reading
	the default RC files.

	* gtk/gtkrc.c: Allow priorities for styles, as wll as
	bindings.

	* gtk/gtkenums.h gtk/gtkrc.c: Add GTK_PATH_PRIO_THEME,
	and use it by default for RC files loaded via
	gtk-theme-name, gtk-key-theme-name.

	* gtk/gtkiconfactory.c (gtk_icon_source_set_filename)
        gtk/gtkrc.c (gtk_rc_parse_pixmap_path_string)
	tests/testgtkrc: Require pathnames to be absolute.

	* gtk/gtkrc.c gtk/gtkiconfactory.c: Look up the full filename for
	the source when parsing, since the operation of looking up a
	pixmap from an RC file depends on the parsing context.

	* gtk/gtkrc.c (gtk_rc_context_reparse_all): Automatically
	reset RC styles on all widgets when files are reparsed.

	* tests/testgtk.c (create_rc_file)
	  gtk/gtkwindow.c (gtk_window_read_rcfiles):
	Simplify, now that gtk_rc_reparse_all() resets styles on
	all widgets itself.

	* gtk/gtkmain.c (gtk_get_default_language): Fix broken
	return value.

	* gtk/gtksettings.[ch] (gtk_settings_install_property[_ch]): Remove
	GtkSettings argument.

	* gtk/gtksettings.[ch] (gtk_settings_get_default): Rename from
	gtk_settings_get_global().

	* gtk/gtkwidget.[ch]: Add a function gtk_widget_Get_settings()
	to get the appropriate GtkSettings for a widget. (For now,
	just gets the default GtkSetttings.)

	* gtk/gtkcolorsel.c gtk/gtkentry.c gtk/gtkmenu.c gtk/gtkmenubar.c
	  gtk/gtktextview.c gtk/gtktoolbar.c: Fixes for GtkSettings
        changes.

	* gtk/gtkrc.[ch]: Add gtk_rc_get_style_by_paths() to allow
	getting a style for a path without actually having a widget.
	(Allows using a style for a subpart of a widget, for
	example.)

	* gtk/gtkrc.[ch]: Add gtk_rc_reparse_all_for_setting() to allow forcing
	the RC files to be reloaded for just one GtkSettings
	(not sure how useful this really is.)

	* gtk/gtkrc.h: Deprecate
	gtk_rc_add_widget_name/widget_class/class_style
2001-06-30 16:08:25 +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 <ctype.h>
#include <string.h> /* memset */
#include "gdk/gdkkeysyms.h"
#include "gtkbindings.h"
#include "gtklabel.h"
#include "gtkmain.h"
#include "gtkmenu.h"
#include "gtkmenuitem.h"
#include "gtksignal.h"
#include "gtkwindow.h"
#include "gtkhbox.h"
#include "gtkvscrollbar.h"
#include "gtksettings.h"
#define MENU_ITEM_CLASS(w) GTK_MENU_ITEM_GET_CLASS (w)
#define MENU_NEEDS_RESIZE(m) GTK_MENU_SHELL (m)->menu_flag
#define SUBMENU_NAV_REGION_PADDING 2
#define SUBMENU_NAV_HYSTERESIS_TIMEOUT 333
#define MENU_SCROLL_STEP 10
#define MENU_SCROLL_ARROW_HEIGHT 16
#define MENU_SCROLL_FAST_ZONE 4
#define MENU_SCROLL_TIMEOUT1 150
#define MENU_SCROLL_TIMEOUT2 50
typedef struct _GtkMenuAttachData GtkMenuAttachData;
struct _GtkMenuAttachData
{
GtkWidget *attach_widget;
GtkMenuDetachFunc detacher;
};
static void gtk_menu_class_init (GtkMenuClass *klass);
static void gtk_menu_init (GtkMenu *menu);
static void gtk_menu_destroy (GtkObject *object);
static void gtk_menu_realize (GtkWidget *widget);
static void gtk_menu_unrealize (GtkWidget *widget);
static void gtk_menu_size_request (GtkWidget *widget,
GtkRequisition *requisition);
static void gtk_menu_size_allocate (GtkWidget *widget,
GtkAllocation *allocation);
static void gtk_menu_paint (GtkWidget *widget);
static gboolean gtk_menu_expose (GtkWidget *widget,
GdkEventExpose *event);
static gboolean gtk_menu_key_press (GtkWidget *widget,
GdkEventKey *event);
static gboolean gtk_menu_motion_notify (GtkWidget *widget,
GdkEventMotion *event);
static gboolean gtk_menu_enter_notify (GtkWidget *widget,
GdkEventCrossing *event);
static gboolean gtk_menu_leave_notify (GtkWidget *widget,
GdkEventCrossing *event);
static void gtk_menu_scroll_to (GtkMenu *menu,
gint offset);
static void gtk_menu_stop_scrolling (GtkMenu *menu);
static gboolean gtk_menu_scroll_timeout (gpointer data);
static void gtk_menu_select_item (GtkMenuShell *menu_shell,
GtkWidget *menu_item);
static void gtk_menu_insert (GtkMenuShell *menu_shell,
GtkWidget *child,
gint position);
static void gtk_menu_scrollbar_changed (GtkAdjustment *adjustment,
GtkMenu *menu);
static void gtk_menu_handle_scrolling (GtkMenu *menu,
gboolean enter);
static void gtk_menu_set_tearoff_hints (GtkMenu *menu,
gint width);
static void gtk_menu_stop_navigating_submenu (GtkMenu *menu);
static gboolean gtk_menu_stop_navigating_submenu_cb (gpointer user_data);
static gboolean gtk_menu_navigating_submenu (GtkMenu *menu,
gint event_x,
gint event_y);
static void gtk_menu_set_submenu_navigation_region (GtkMenu *menu,
GtkMenuItem *menu_item,
GdkEventCrossing *event);
static void gtk_menu_deactivate (GtkMenuShell *menu_shell);
static void gtk_menu_show_all (GtkWidget *widget);
static void gtk_menu_hide_all (GtkWidget *widget);
static void gtk_menu_position (GtkMenu *menu);
static void gtk_menu_reparent (GtkMenu *menu,
GtkWidget *new_parent,
gboolean unrealize);
static void gtk_menu_remove (GtkContainer *menu,
GtkWidget *widget);
static GtkMenuShellClass *parent_class = NULL;
static const gchar *attach_data_key = "gtk-menu-attach-data";
GtkType
gtk_menu_get_type (void)
{
static GtkType menu_type = 0;
if (!menu_type)
{
static const GtkTypeInfo menu_info =
{
"GtkMenu",
sizeof (GtkMenu),
sizeof (GtkMenuClass),
(GtkClassInitFunc) gtk_menu_class_init,
(GtkObjectInitFunc) gtk_menu_init,
/* reserved_1 */ NULL,
/* reserved_2 */ NULL,
(GtkClassInitFunc) NULL,
};
menu_type = gtk_type_unique (gtk_menu_shell_get_type (), &menu_info);
}
return menu_type;
}
static void
gtk_menu_class_init (GtkMenuClass *class)
{
GtkObjectClass *object_class;
GtkWidgetClass *widget_class;
GtkContainerClass *container_class;
GtkMenuShellClass *menu_shell_class;
GtkBindingSet *binding_set;
object_class = (GtkObjectClass*) class;
widget_class = (GtkWidgetClass*) class;
container_class = (GtkContainerClass*) class;
menu_shell_class = (GtkMenuShellClass*) class;
parent_class = gtk_type_class (gtk_menu_shell_get_type ());
object_class->destroy = gtk_menu_destroy;
widget_class->realize = gtk_menu_realize;
widget_class->unrealize = gtk_menu_unrealize;
widget_class->size_request = gtk_menu_size_request;
widget_class->size_allocate = gtk_menu_size_allocate;
widget_class->expose_event = gtk_menu_expose;
widget_class->key_press_event = gtk_menu_key_press;
widget_class->motion_notify_event = gtk_menu_motion_notify;
widget_class->show_all = gtk_menu_show_all;
widget_class->hide_all = gtk_menu_hide_all;
widget_class->enter_notify_event = gtk_menu_enter_notify;
widget_class->leave_notify_event = gtk_menu_leave_notify;
container_class->remove = gtk_menu_remove;
menu_shell_class->submenu_placement = GTK_LEFT_RIGHT;
menu_shell_class->deactivate = gtk_menu_deactivate;
menu_shell_class->select_item = gtk_menu_select_item;
menu_shell_class->insert = gtk_menu_insert;
binding_set = gtk_binding_set_by_class (class);
gtk_binding_entry_add_signal (binding_set,
GDK_Up, 0,
"move_current", 1,
GTK_TYPE_MENU_DIRECTION_TYPE,
GTK_MENU_DIR_PREV);
gtk_binding_entry_add_signal (binding_set,
GDK_KP_Up, 0,
"move_current", 1,
GTK_TYPE_MENU_DIRECTION_TYPE,
GTK_MENU_DIR_PREV);
gtk_binding_entry_add_signal (binding_set,
GDK_Down, 0,
"move_current", 1,
GTK_TYPE_MENU_DIRECTION_TYPE,
GTK_MENU_DIR_NEXT);
gtk_binding_entry_add_signal (binding_set,
GDK_KP_Down, 0,
"move_current", 1,
GTK_TYPE_MENU_DIRECTION_TYPE,
GTK_MENU_DIR_NEXT);
gtk_binding_entry_add_signal (binding_set,
GDK_Left, 0,
"move_current", 1,
GTK_TYPE_MENU_DIRECTION_TYPE,
GTK_MENU_DIR_PARENT);
gtk_binding_entry_add_signal (binding_set,
GDK_KP_Left, 0,
"move_current", 1,
GTK_TYPE_MENU_DIRECTION_TYPE,
GTK_MENU_DIR_PARENT);
gtk_binding_entry_add_signal (binding_set,
GDK_Right, 0,
"move_current", 1,
GTK_TYPE_MENU_DIRECTION_TYPE,
GTK_MENU_DIR_CHILD);
gtk_binding_entry_add_signal (binding_set,
GDK_KP_Right, 0,
"move_current", 1,
GTK_TYPE_MENU_DIRECTION_TYPE,
GTK_MENU_DIR_CHILD);
}
static gboolean
gtk_menu_window_event (GtkWidget *window,
GdkEvent *event,
GtkWidget *menu)
{
gboolean handled = FALSE;
gtk_widget_ref (window);
gtk_widget_ref (menu);
switch (event->type)
{
case GDK_KEY_PRESS:
case GDK_KEY_RELEASE:
handled = gtk_widget_event (menu, event);
break;
default:
break;
}
gtk_widget_unref (window);
gtk_widget_unref (menu);
return handled;
}
static void
gtk_menu_init (GtkMenu *menu)
{
menu->parent_menu_item = NULL;
menu->old_active_menu_item = NULL;
menu->accel_group = NULL;
menu->position_func = NULL;
menu->position_func_data = NULL;
menu->toggle_size = 0;
menu->toplevel = g_object_connect (gtk_widget_new (GTK_TYPE_WINDOW,
"type", GTK_WINDOW_POPUP,
"child", menu,
NULL),
"signal::event", gtk_menu_window_event, menu,
"signal::destroy", gtk_widget_destroyed, &menu->toplevel,
NULL);
gtk_window_set_policy (GTK_WINDOW (menu->toplevel),
FALSE, FALSE, TRUE);
gtk_window_set_mnemonic_modifier (GTK_WINDOW (menu->toplevel), 0);
/* Refloat the menu, so that reference counting for the menu isn't
* affected by it being a child of the toplevel
*/
GTK_WIDGET_SET_FLAGS (menu, GTK_FLOATING);
menu->needs_destruction_ref_count = TRUE;
menu->view_window = NULL;
menu->bin_window = NULL;
menu->scroll_offset = 0;
menu->scroll_step = 0;
menu->timeout_id = 0;
menu->scroll_fast = FALSE;
menu->tearoff_window = NULL;
menu->tearoff_hbox = NULL;
menu->torn_off = FALSE;
menu->tearoff_active = FALSE;
menu->tearoff_adjustment = NULL;
menu->tearoff_scrollbar = NULL;
menu->upper_arrow_visible = FALSE;
menu->lower_arrow_visible = FALSE;
menu->upper_arrow_prelight = FALSE;
menu->lower_arrow_prelight = FALSE;
MENU_NEEDS_RESIZE (menu) = TRUE;
}
static void
gtk_menu_destroy (GtkObject *object)
{
GtkMenu *menu;
GtkMenuAttachData *data;
g_return_if_fail (GTK_IS_MENU (object));
menu = GTK_MENU (object);
gtk_menu_stop_scrolling (menu);
data = gtk_object_get_data (object, attach_data_key);
if (data)
gtk_menu_detach (menu);
gtk_menu_stop_navigating_submenu (menu);
gtk_menu_set_accel_group (menu, NULL);
if (menu->old_active_menu_item)
{
gtk_widget_unref (menu->old_active_menu_item);
menu->old_active_menu_item = NULL;
}
/* Add back the reference count for being a child */
if (menu->needs_destruction_ref_count)
{
menu->needs_destruction_ref_count = FALSE;
gtk_object_ref (object);
}
if (menu->toplevel)
gtk_widget_destroy (menu->toplevel);
if (menu->tearoff_window)
gtk_widget_destroy (menu->tearoff_window);
GTK_OBJECT_CLASS (parent_class)->destroy (object);
}
void
gtk_menu_attach_to_widget (GtkMenu *menu,
GtkWidget *attach_widget,
GtkMenuDetachFunc detacher)
{
GtkMenuAttachData *data;
g_return_if_fail (menu != NULL);
g_return_if_fail (GTK_IS_MENU (menu));
g_return_if_fail (attach_widget != NULL);
g_return_if_fail (GTK_IS_WIDGET (attach_widget));
g_return_if_fail (detacher != NULL);
/* keep this function in sync with gtk_widget_set_parent()
*/
data = gtk_object_get_data (GTK_OBJECT (menu), attach_data_key);
if (data)
{
g_warning ("gtk_menu_attach_to_widget(): menu already attached to %s",
gtk_type_name (GTK_OBJECT_TYPE (data->attach_widget)));
return;
}
gtk_object_ref (GTK_OBJECT (menu));
gtk_object_sink (GTK_OBJECT (menu));
data = g_new (GtkMenuAttachData, 1);
data->attach_widget = attach_widget;
data->detacher = detacher;
gtk_object_set_data (GTK_OBJECT (menu), attach_data_key, data);
if (GTK_WIDGET_STATE (menu) != GTK_STATE_NORMAL)
gtk_widget_set_state (GTK_WIDGET (menu), GTK_STATE_NORMAL);
/* we don't need to set the style here, since
* we are a toplevel widget.
*/
}
GtkWidget*
gtk_menu_get_attach_widget (GtkMenu *menu)
{
GtkMenuAttachData *data;
g_return_val_if_fail (menu != NULL, NULL);
g_return_val_if_fail (GTK_IS_MENU (menu), NULL);
data = gtk_object_get_data (GTK_OBJECT (menu), attach_data_key);
if (data)
return data->attach_widget;
return NULL;
}
void
gtk_menu_detach (GtkMenu *menu)
{
GtkMenuAttachData *data;
g_return_if_fail (menu != NULL);
g_return_if_fail (GTK_IS_MENU (menu));
/* keep this function in sync with gtk_widget_unparent()
*/
data = gtk_object_get_data (GTK_OBJECT (menu), attach_data_key);
if (!data)
{
g_warning ("gtk_menu_detach(): menu is not attached");
return;
}
gtk_object_remove_data (GTK_OBJECT (menu), attach_data_key);
data->detacher (data->attach_widget, menu);
if (GTK_WIDGET_REALIZED (menu))
gtk_widget_unrealize (GTK_WIDGET (menu));
g_free (data);
gtk_widget_unref (GTK_WIDGET (menu));
}
void
gtk_menu_remove(GtkContainer *container,
GtkWidget *widget)
{
GtkMenu *menu;
g_return_if_fail (GTK_IS_MENU (container));
g_return_if_fail (GTK_IS_MENU_ITEM (widget));
menu = GTK_MENU (container);
/* Clear out old_active_menu_item if it matches the item we are removing
*/
if (menu->old_active_menu_item == widget)
{
gtk_widget_unref (menu->old_active_menu_item);
menu->old_active_menu_item = NULL;
}
GTK_CONTAINER_CLASS (parent_class)->remove (container, widget);
}
GtkWidget*
gtk_menu_new (void)
{
return GTK_WIDGET (gtk_type_new (gtk_menu_get_type ()));
}
static void
gtk_menu_insert (GtkMenuShell *menu_shell,
GtkWidget *child,
gint position)
{
GTK_MENU_SHELL_CLASS (parent_class)->insert (menu_shell, child, position);
gtk_widget_set_parent_window (child, GTK_MENU (menu_shell)->bin_window);
}
static void
gtk_menu_tearoff_bg_copy (GtkMenu *menu)
{
GtkWidget *widget;
gint width, height;
widget = GTK_WIDGET (menu);
if (menu->torn_off)
{
GdkPixmap *pixmap;
GdkGC *gc;
GdkGCValues gc_values;
menu->tearoff_active = FALSE;
menu->saved_scroll_offset = menu->scroll_offset;
gc_values.subwindow_mode = GDK_INCLUDE_INFERIORS;
gc = gdk_gc_new_with_values (widget->window,
&gc_values, GDK_GC_SUBWINDOW);
gdk_window_get_size (menu->tearoff_window->window, &width, &height);
pixmap = gdk_pixmap_new (menu->tearoff_window->window,
width,
height,
-1);
gdk_draw_pixmap (pixmap, gc,
menu->tearoff_window->window,
0, 0, 0, 0, -1, -1);
gdk_gc_unref (gc);
gtk_widget_set_usize (menu->tearoff_window,
width,
height);
gdk_window_set_back_pixmap (menu->tearoff_window->window, pixmap, FALSE);
gdk_pixmap_unref (pixmap);
}
}
void
gtk_menu_popup (GtkMenu *menu,
GtkWidget *parent_menu_shell,
GtkWidget *parent_menu_item,
GtkMenuPositionFunc func,
gpointer data,
guint button,
guint32 activate_time)
{
GtkWidget *widget;
GtkWidget *xgrab_shell;
GtkWidget *parent;
GdkEvent *current_event;
GtkMenuShell *menu_shell;
g_return_if_fail (menu != NULL);
g_return_if_fail (GTK_IS_MENU (menu));
widget = GTK_WIDGET (menu);
menu_shell = GTK_MENU_SHELL (menu);
menu_shell->parent_menu_shell = parent_menu_shell;
menu_shell->active = TRUE;
menu_shell->button = button;
/* If we are popping up the menu from something other than, a button
* press then, as a heuristic, we ignore enter events for the menu
* until we get a MOTION_NOTIFY.
*/
current_event = gtk_get_current_event();
if (current_event)
{
if ((current_event->type != GDK_BUTTON_PRESS) &&
(current_event->type != GDK_ENTER_NOTIFY))
menu_shell->ignore_enter = TRUE;
}
if (menu->torn_off)
{
gtk_menu_tearoff_bg_copy (menu);
gtk_menu_reparent (menu, menu->toplevel, FALSE);
}
menu->parent_menu_item = parent_menu_item;
menu->position_func = func;
menu->position_func_data = data;
menu_shell->activate_time = activate_time;
gtk_menu_position (menu);
/* We need to show the menu _here_ because code expects to be
* able to tell if the menu is onscreen by looking at the
* GTK_WIDGET_VISIBLE (menu)
*/
gtk_widget_show (GTK_WIDGET (menu));
gtk_widget_show (menu->toplevel);
if (current_event)
{
/* Also, if we're popping up from a key event, select the first
* item in the menu. Bad hack, but no better way to do it
* in current menu framework.
*/
if (current_event->type == GDK_KEY_PRESS &&
GTK_MENU_SHELL (menu)->children)
{
gtk_menu_shell_select_item (GTK_MENU_SHELL (menu),
GTK_MENU_SHELL (menu)->children->data);
}
gdk_event_free (current_event);
}
gtk_menu_scroll_to (menu, menu->scroll_offset);
/* Find the last viewable ancestor, and make an X grab on it
*/
parent = GTK_WIDGET (menu);
xgrab_shell = NULL;
while (parent)
{
gboolean viewable = TRUE;
GtkWidget *tmp = parent;
while (tmp)
{
if (!GTK_WIDGET_MAPPED (tmp))
{
viewable = FALSE;
break;
}
tmp = tmp->parent;
}
if (viewable)
xgrab_shell = parent;
parent = GTK_MENU_SHELL (parent)->parent_menu_shell;
}
if (xgrab_shell && (!GTK_MENU_SHELL (xgrab_shell)->have_xgrab))
{
if ((gdk_pointer_grab (xgrab_shell->window, TRUE,
GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK |
GDK_ENTER_NOTIFY_MASK | GDK_LEAVE_NOTIFY_MASK |
GDK_POINTER_MOTION_MASK,
NULL, NULL, activate_time) == 0))
{
if (gdk_keyboard_grab (xgrab_shell->window, TRUE,
activate_time) == 0)
GTK_MENU_SHELL (xgrab_shell)->have_xgrab = TRUE;
else
gdk_pointer_ungrab (activate_time);
}
}
gtk_grab_add (GTK_WIDGET (menu));
}
void
gtk_menu_popdown (GtkMenu *menu)
{
GtkMenuShell *menu_shell;
g_return_if_fail (menu != NULL);
g_return_if_fail (GTK_IS_MENU (menu));
menu_shell = GTK_MENU_SHELL (menu);
menu_shell->parent_menu_shell = NULL;
menu_shell->active = FALSE;
menu_shell->ignore_enter = FALSE;
gtk_menu_stop_scrolling (menu);
gtk_menu_stop_navigating_submenu (menu);
if (menu_shell->active_menu_item)
{
if (menu->old_active_menu_item)
gtk_widget_unref (menu->old_active_menu_item);
menu->old_active_menu_item = menu_shell->active_menu_item;
gtk_widget_ref (menu->old_active_menu_item);
}
gtk_menu_shell_deselect (menu_shell);
/* The X Grab, if present, will automatically be removed when we hide
* the window */
gtk_widget_hide (menu->toplevel);
if (menu->torn_off)
{
gint width, height;
gdk_window_get_size (menu->tearoff_window->window, &width, &height);
gtk_widget_set_usize (menu->tearoff_window,
-1,
height);
if (GTK_BIN (menu->toplevel)->child)
{
gtk_menu_reparent (menu, menu->tearoff_hbox, TRUE);
}
else
{
/* We popped up the menu from the tearoff, so we need to
* release the grab - we aren't actually hiding the menu.
*/
if (menu_shell->have_xgrab)
{
gdk_pointer_ungrab (GDK_CURRENT_TIME);
gdk_keyboard_ungrab (GDK_CURRENT_TIME);
}
}
/* gtk_menu_popdown is called each time a menu item is selected from
* a torn off menu. Only scroll back to the saved position if the
* non-tearoff menu was popped down.
*/
if (!menu->tearoff_active)
gtk_menu_scroll_to (menu, menu->saved_scroll_offset);
menu->tearoff_active = TRUE;
}
else
gtk_widget_hide (GTK_WIDGET (menu));
menu_shell->have_xgrab = FALSE;
gtk_grab_remove (GTK_WIDGET (menu));
}
GtkWidget*
gtk_menu_get_active (GtkMenu *menu)
{
GtkWidget *child;
GList *children;
g_return_val_if_fail (menu != NULL, NULL);
g_return_val_if_fail (GTK_IS_MENU (menu), NULL);
if (!menu->old_active_menu_item)
{
child = NULL;
children = GTK_MENU_SHELL (menu)->children;
while (children)
{
child = children->data;
children = children->next;
if (GTK_BIN (child)->child)
break;
child = NULL;
}
menu->old_active_menu_item = child;
if (menu->old_active_menu_item)
gtk_widget_ref (menu->old_active_menu_item);
}
return menu->old_active_menu_item;
}
void
gtk_menu_set_active (GtkMenu *menu,
guint index)
{
GtkWidget *child;
GList *tmp_list;
g_return_if_fail (menu != NULL);
g_return_if_fail (GTK_IS_MENU (menu));
tmp_list = g_list_nth (GTK_MENU_SHELL (menu)->children, index);
if (tmp_list)
{
child = tmp_list->data;
if (GTK_BIN (child)->child)
{
if (menu->old_active_menu_item)
gtk_widget_unref (menu->old_active_menu_item);
menu->old_active_menu_item = child;
gtk_widget_ref (menu->old_active_menu_item);
}
}
}
void
gtk_menu_set_accel_group (GtkMenu *menu,
GtkAccelGroup *accel_group)
{
g_return_if_fail (GTK_IS_MENU (menu));
if (menu->accel_group != accel_group)
{
if (menu->accel_group)
gtk_accel_group_unref (menu->accel_group);
menu->accel_group = accel_group;
if (menu->accel_group)
gtk_accel_group_ref (menu->accel_group);
}
}
GtkAccelGroup*
gtk_menu_get_accel_group (GtkMenu *menu)
{
g_return_val_if_fail (GTK_IS_MENU (menu), NULL);
return menu->accel_group;
}
void
gtk_menu_reposition (GtkMenu *menu)
{
g_return_if_fail (menu != NULL);
g_return_if_fail (GTK_IS_MENU (menu));
if (GTK_WIDGET_DRAWABLE (menu) && !menu->torn_off)
gtk_menu_position (menu);
}
static void
gtk_menu_scrollbar_changed (GtkAdjustment *adjustment,
GtkMenu *menu)
{
g_return_if_fail (menu != NULL);
g_return_if_fail (GTK_IS_MENU (menu));
if (adjustment->value != menu->scroll_offset)
gtk_menu_scroll_to (menu, adjustment->value);
}
static void
gtk_menu_set_tearoff_hints(GtkMenu *menu,
gint width)
{
GdkGeometry geometry_hints;
if (!menu->tearoff_window)
return;
geometry_hints.min_width = width;
geometry_hints.max_width = width;
geometry_hints.min_height = 0;
geometry_hints.max_height = GTK_WIDGET (menu)->requisition.height;
gtk_window_set_geometry_hints (GTK_WINDOW (menu->tearoff_window),
NULL,
&geometry_hints,
GDK_HINT_MAX_SIZE|GDK_HINT_MIN_SIZE);
}
void
gtk_menu_set_tearoff_state (GtkMenu *menu,
gboolean torn_off)
{
gint width, height;
g_return_if_fail (menu != NULL);
g_return_if_fail (GTK_IS_MENU (menu));
if (menu->torn_off != torn_off)
{
menu->torn_off = torn_off;
menu->tearoff_active = torn_off;
if (menu->torn_off)
{
if (GTK_WIDGET_VISIBLE (menu))
gtk_menu_popdown (menu);
if (!menu->tearoff_window)
{
GtkWidget *attach_widget;
gchar *title;
menu->tearoff_window = g_object_connect (gtk_widget_new (GTK_TYPE_WINDOW,
"type", GTK_WINDOW_TOPLEVEL,
NULL),
"signal::destroy", gtk_widget_destroyed, &menu->tearoff_window,
NULL);
gtk_window_set_type_hint (GTK_WINDOW (menu->tearoff_window),
GDK_WINDOW_TYPE_HINT_MENU);
gtk_window_set_mnemonic_modifier (GTK_WINDOW (menu->tearoff_window), 0);
gtk_widget_set_app_paintable (menu->tearoff_window, TRUE);
gtk_signal_connect (GTK_OBJECT (menu->tearoff_window),
"event",
GTK_SIGNAL_FUNC (gtk_menu_window_event),
GTK_OBJECT (menu));
gtk_widget_realize (menu->tearoff_window);
title = gtk_object_get_data (GTK_OBJECT (menu), "gtk-menu-title");
if (!title)
{
attach_widget = gtk_menu_get_attach_widget (menu);
if (GTK_IS_MENU_ITEM (attach_widget))
{
GtkWidget *child = GTK_BIN (attach_widget)->child;
if (GTK_IS_LABEL (child))
gtk_label_get (GTK_LABEL (child), &title);
}
}
if (title)
gdk_window_set_title (menu->tearoff_window->window, title);
gdk_window_set_decorations (menu->tearoff_window->window,
GDK_DECOR_ALL |
GDK_DECOR_RESIZEH |
GDK_DECOR_MINIMIZE |
GDK_DECOR_MAXIMIZE);
gtk_window_set_policy (GTK_WINDOW (menu->tearoff_window),
FALSE, FALSE, TRUE);
menu->tearoff_hbox = gtk_hbox_new (FALSE, FALSE);
gtk_container_add (GTK_CONTAINER (menu->tearoff_window), menu->tearoff_hbox);
gdk_window_get_size (GTK_WIDGET (menu)->window, &width, &height);
menu->tearoff_adjustment =
GTK_ADJUSTMENT (gtk_adjustment_new (0,
0,
GTK_WIDGET (menu)->requisition.height,
MENU_SCROLL_STEP,
height/2,
height));
g_object_connect (GTK_OBJECT (menu->tearoff_adjustment),
"signal::value_changed", gtk_menu_scrollbar_changed, menu,
NULL);
menu->tearoff_scrollbar = gtk_vscrollbar_new (menu->tearoff_adjustment);
gtk_box_pack_end (GTK_BOX (menu->tearoff_hbox),
menu->tearoff_scrollbar,
FALSE, FALSE, 0);
if (menu->tearoff_adjustment->upper > height)
gtk_widget_show (menu->tearoff_scrollbar);
gtk_widget_show (menu->tearoff_hbox);
}
gtk_menu_reparent (menu, menu->tearoff_hbox, FALSE);
gdk_window_get_size (GTK_WIDGET (menu)->window, &width, &height);
if (GTK_WIDGET_VISIBLE (menu->tearoff_scrollbar))
width += menu->tearoff_scrollbar->requisition.width;
gtk_menu_set_tearoff_hints (menu, width);
gtk_widget_realize (menu->tearoff_window);
gtk_menu_position (menu);
gtk_widget_show (GTK_WIDGET (menu));
gtk_widget_show (menu->tearoff_window);
gtk_menu_scroll_to (menu, 0);
}
else
{
gtk_widget_hide (menu->tearoff_window);
gtk_menu_reparent (menu, menu->toplevel, FALSE);
}
}
}
/**
* gtk_menu_get_tearoff_state:
* @menu: a #GtkMenu
*
* Returns whether the menu is torn off. See
* gtk_menu_set_tearoff_state ().
*
* Return value: %TRUE if the menu is currently torn off.
**/
gboolean
gtk_menu_get_tearoff_state (GtkMenu *menu)
{
g_return_val_if_fail (GTK_IS_MENU (menu), FALSE);
return menu->torn_off;
}
void
gtk_menu_set_title (GtkMenu *menu,
const gchar *title)
{
g_return_if_fail (menu != NULL);
g_return_if_fail (GTK_IS_MENU (menu));
gtk_object_set_data_full (GTK_OBJECT (menu), "gtk-menu-title",
g_strdup (title), (GtkDestroyNotify) g_free);
}
/**
* gtk_menu_get_title:
* @menu: a #GtkMenu
*
* Returns the title of the menu. See gtk_menu_set_title().
*
* Return value: the title of the menu, or %NULL if the menu has no
* title set on it.
**/
G_CONST_RETURN gchar *
gtk_menu_get_title (GtkMenu *menu)
{
g_return_val_if_fail (GTK_IS_MENU (menu), NULL);
return gtk_object_get_data (GTK_OBJECT (menu), "gtk-menu-title");
}
void
gtk_menu_reorder_child (GtkMenu *menu,
GtkWidget *child,
gint position)
{
GtkMenuShell *menu_shell;
g_return_if_fail (GTK_IS_MENU (menu));
g_return_if_fail (GTK_IS_MENU_ITEM (child));
menu_shell = GTK_MENU_SHELL (menu);
if (g_list_find (menu_shell->children, child))
{
menu_shell->children = g_list_remove (menu_shell->children, child);
menu_shell->children = g_list_insert (menu_shell->children, child, position);
if (GTK_WIDGET_VISIBLE (menu_shell))
gtk_widget_queue_resize (GTK_WIDGET (menu_shell));
}
}
static void
gtk_menu_realize (GtkWidget *widget)
{
GdkWindowAttr attributes;
gint attributes_mask;
gint border_width;
GtkMenu *menu;
GtkWidget *child;
GList *children;
g_return_if_fail (widget != NULL);
g_return_if_fail (GTK_IS_MENU (widget));
menu = GTK_MENU (widget);
GTK_WIDGET_SET_FLAGS (widget, 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 = gtk_widget_get_events (widget);
attributes.event_mask |= (GDK_EXPOSURE_MASK | GDK_KEY_PRESS_MASK |
GDK_ENTER_NOTIFY_MASK | GDK_LEAVE_NOTIFY_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);
border_width = GTK_CONTAINER (widget)->border_width;
attributes.x = border_width + widget->style->xthickness;
attributes.y = border_width + widget->style->ythickness;
attributes.width = MAX (1, widget->allocation.width - attributes.x * 2);
attributes.height = MAX (1, widget->allocation.height - attributes.y * 2);
if (menu->upper_arrow_visible)
{
attributes.y += MENU_SCROLL_ARROW_HEIGHT;
attributes.height -= MENU_SCROLL_ARROW_HEIGHT;
}
if (menu->lower_arrow_visible)
attributes.height -= MENU_SCROLL_ARROW_HEIGHT;
menu->view_window = gdk_window_new (widget->window, &attributes, attributes_mask);
gdk_window_set_user_data (menu->view_window, menu);
attributes.x = 0;
attributes.y = 0;
attributes.height = MAX (1, widget->requisition.height - (border_width + widget->style->ythickness) * 2);
menu->bin_window = gdk_window_new (menu->view_window, &attributes, attributes_mask);
gdk_window_set_user_data (menu->bin_window, menu);
children = GTK_MENU_SHELL (menu)->children;
while (children)
{
child = children->data;
children = children->next;
gtk_widget_set_parent_window (child, menu->bin_window);
}
widget->style = gtk_style_attach (widget->style, widget->window);
gtk_style_set_background (widget->style, menu->bin_window, GTK_STATE_NORMAL);
gtk_style_set_background (widget->style, menu->view_window, GTK_STATE_NORMAL);
gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
gtk_menu_paint (widget);
gdk_window_show (menu->bin_window);
gdk_window_show (menu->view_window);
}
static void
gtk_menu_unrealize (GtkWidget *widget)
{
GtkMenu *menu;
g_return_if_fail (widget != NULL);
g_return_if_fail (GTK_IS_MENU (widget));
menu = GTK_MENU (widget);
gdk_window_set_user_data (menu->view_window, NULL);
gdk_window_destroy (menu->view_window);
menu->view_window = NULL;
gdk_window_set_user_data (menu->bin_window, NULL);
gdk_window_destroy (menu->bin_window);
menu->bin_window = NULL;
(* GTK_WIDGET_CLASS (parent_class)->unrealize) (widget);
}
static void
gtk_menu_size_request (GtkWidget *widget,
GtkRequisition *requisition)
{
GtkMenu *menu;
GtkMenuShell *menu_shell;
GtkWidget *child;
GList *children;
guint max_toggle_size;
guint max_accel_width;
GtkRequisition child_requisition;
gint width;
g_return_if_fail (widget != NULL);
g_return_if_fail (GTK_IS_MENU (widget));
g_return_if_fail (requisition != NULL);
menu = GTK_MENU (widget);
menu_shell = GTK_MENU_SHELL (widget);
requisition->width = 0;
requisition->height = 0;
max_toggle_size = 0;
max_accel_width = 0;
children = menu_shell->children;
while (children)
{
child = children->data;
children = children->next;
if (GTK_WIDGET_VISIBLE (child))
{
gint toggle_size;
/* It's important to size_request the child
* before doing the toggle size request, in
* case the toggle size request depends on the size
* request of a child of the child (e.g. for ImageMenuItem)
*/
GTK_MENU_ITEM (child)->show_submenu_indicator = TRUE;
gtk_widget_size_request (child, &child_requisition);
requisition->width = MAX (requisition->width, child_requisition.width);
requisition->height += child_requisition.height;
gtk_menu_item_toggle_size_request (GTK_MENU_ITEM (child), &toggle_size);
max_toggle_size = MAX (max_toggle_size, toggle_size);
max_accel_width = MAX (max_accel_width, GTK_MENU_ITEM (child)->accelerator_width);
}
}
requisition->width += max_toggle_size + max_accel_width;
requisition->width += (GTK_CONTAINER (menu)->border_width +
widget->style->xthickness) * 2;
requisition->height += (GTK_CONTAINER (menu)->border_width +
widget->style->ythickness) * 2;
menu->toggle_size = max_toggle_size;
/* If the requested width was different than the allocated width, we need to change
* the geometry hints for the tear off window so that the window can actually be resized.
* Don't resize the tearoff if it is not active, beacuse it won't redraw (it is only a background pixmap).
*/
if ((requisition->width != GTK_WIDGET (menu)->allocation.width) && menu->tearoff_active)
{
width = requisition->width;
if (menu->tearoff_scrollbar && GTK_WIDGET_VISIBLE (menu->tearoff_scrollbar))
width += menu->tearoff_scrollbar->requisition.width;
gtk_menu_set_tearoff_hints (menu, width);
}
}
static void
gtk_menu_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
GtkMenu *menu;
GtkMenuShell *menu_shell;
GtkWidget *child;
GtkAllocation child_allocation;
GList *children;
gint x, y;
gint width, height;
g_return_if_fail (widget != NULL);
g_return_if_fail (GTK_IS_MENU (widget));
g_return_if_fail (allocation != NULL);
menu = GTK_MENU (widget);
menu_shell = GTK_MENU_SHELL (widget);
widget->allocation = *allocation;
x = GTK_CONTAINER (menu)->border_width + widget->style->xthickness;
y = GTK_CONTAINER (menu)->border_width + widget->style->ythickness;
width = MAX (1, allocation->width - x * 2);
height = MAX (1, allocation->height - y * 2);
if (menu->upper_arrow_visible && !menu->tearoff_active)
{
y += MENU_SCROLL_ARROW_HEIGHT;
height -= MENU_SCROLL_ARROW_HEIGHT;
}
if (menu->lower_arrow_visible && !menu->tearoff_active)
height -= MENU_SCROLL_ARROW_HEIGHT;
if (GTK_WIDGET_REALIZED (widget))
{
gdk_window_move_resize (widget->window,
allocation->x, allocation->y,
allocation->width, allocation->height);
gdk_window_move_resize (menu->view_window,
x,
y,
width,
height);
}
if (menu_shell->children)
{
child_allocation.x = 0;
child_allocation.y = 0;
child_allocation.width = width;
children = menu_shell->children;
while (children)
{
child = children->data;
children = children->next;
if (GTK_WIDGET_VISIBLE (child))
{
GtkRequisition child_requisition;
gtk_widget_get_child_requisition (child, &child_requisition);
child_allocation.height = child_requisition.height;
gtk_menu_item_toggle_size_allocate (GTK_MENU_ITEM (child),
menu->toggle_size);
gtk_widget_size_allocate (child, &child_allocation);
gtk_widget_queue_draw (child);
child_allocation.y += child_allocation.height;
}
}
/* Resize the item window */
if (GTK_WIDGET_REALIZED (widget))
{
gdk_window_resize (menu->bin_window,
child_allocation.width,
child_allocation.y);
}
if (menu->tearoff_active)
{
if (allocation->height >= widget->requisition.height)
{
if (GTK_WIDGET_VISIBLE (menu->tearoff_scrollbar))
{
gtk_widget_hide (menu->tearoff_scrollbar);
gtk_menu_set_tearoff_hints (menu, allocation->width);
gtk_widget_set_usize (menu->tearoff_window, -1, allocation->height);
gtk_menu_scroll_to (menu, 0);
}
}
else
{
menu->tearoff_adjustment->upper = widget->requisition.height;
menu->tearoff_adjustment->page_size = allocation->height;
if (menu->tearoff_adjustment->value + menu->tearoff_adjustment->page_size >
menu->tearoff_adjustment->upper)
{
gint value;
value = menu->tearoff_adjustment->upper - menu->tearoff_adjustment->page_size;
if (value < 0)
value = 0;
gtk_menu_scroll_to (menu, value);
}
gtk_adjustment_changed (menu->tearoff_adjustment);
if (!GTK_WIDGET_VISIBLE (menu->tearoff_scrollbar))
{
gtk_menu_set_tearoff_hints (menu,
allocation->width + menu->tearoff_scrollbar->requisition.width);
gtk_widget_show (menu->tearoff_scrollbar);
gtk_widget_set_usize (menu->tearoff_window, -1, allocation->height);
}
}
}
}
}
static void
gtk_menu_paint (GtkWidget *widget)
{
gint border_x;
gint border_y;
gint width, height;
gint menu_height;
gint top_pos;
GtkMenu *menu;
g_return_if_fail (widget != NULL);
g_return_if_fail (GTK_IS_MENU (widget));
menu = GTK_MENU (widget);
if (GTK_WIDGET_DRAWABLE (widget))
{
gtk_paint_box (widget->style,
widget->window,
GTK_STATE_NORMAL,
GTK_SHADOW_OUT,
NULL, widget, "menu",
0, 0, -1, -1);
border_x = GTK_CONTAINER (widget)->border_width + widget->style->xthickness;
border_y = GTK_CONTAINER (widget)->border_width + widget->style->ythickness;
gdk_window_get_size (widget->window, &width, &height);
if (menu->upper_arrow_visible && !menu->tearoff_active)
{
gtk_paint_box (widget->style,
widget->window,
menu->upper_arrow_prelight ?
GTK_STATE_PRELIGHT : GTK_STATE_NORMAL,
GTK_SHADOW_OUT,
NULL, widget, "menu",
border_x,
border_y,
width - 2*border_x,
MENU_SCROLL_ARROW_HEIGHT);
gtk_paint_arrow (widget->style,
widget->window,
menu->upper_arrow_prelight ?
GTK_STATE_PRELIGHT : GTK_STATE_NORMAL,
GTK_SHADOW_OUT,
NULL, widget, "menu",
GTK_ARROW_UP,
TRUE,
width / 2 - MENU_SCROLL_ARROW_HEIGHT / 2 + 1,
2 * border_y + 1,
MENU_SCROLL_ARROW_HEIGHT - 2 * border_y - 2,
MENU_SCROLL_ARROW_HEIGHT - 2 * border_y - 2);
}
if (menu->lower_arrow_visible && !menu->tearoff_active)
{
gtk_paint_box (widget->style,
widget->window,
menu->lower_arrow_prelight ?
GTK_STATE_PRELIGHT : GTK_STATE_NORMAL,
GTK_SHADOW_OUT,
NULL, widget, "menu",
border_x,
height - border_y - MENU_SCROLL_ARROW_HEIGHT + 1,
width - 2*border_x,
MENU_SCROLL_ARROW_HEIGHT);
gtk_paint_arrow (widget->style,
widget->window,
menu->lower_arrow_prelight ?
GTK_STATE_PRELIGHT : GTK_STATE_NORMAL,
GTK_SHADOW_OUT,
NULL, widget, "menu",
GTK_ARROW_DOWN,
TRUE,
width / 2 - MENU_SCROLL_ARROW_HEIGHT / 2 + 1,
height - MENU_SCROLL_ARROW_HEIGHT + 1,
MENU_SCROLL_ARROW_HEIGHT - 2 * border_y - 2,
MENU_SCROLL_ARROW_HEIGHT - 2 * border_y - 2);
}
if (menu->scroll_offset < 0)
gtk_paint_box (widget->style,
menu->view_window,
GTK_STATE_ACTIVE,
GTK_SHADOW_IN,
NULL, widget, "menu",
0, 0,
-1,
-menu->scroll_offset);
menu_height = widget->requisition.height - 2*border_y;
top_pos = height - 2*border_y - (menu->upper_arrow_visible ? MENU_SCROLL_ARROW_HEIGHT : 0);
if (menu_height - menu->scroll_offset < top_pos)
gtk_paint_box (widget->style,
menu->view_window,
GTK_STATE_ACTIVE,
GTK_SHADOW_IN,
NULL, widget, "menu",
0,
menu_height - menu->scroll_offset,
-1,
top_pos - (menu_height - menu->scroll_offset));
}
}
static gboolean
gtk_menu_expose (GtkWidget *widget,
GdkEventExpose *event)
{
g_return_val_if_fail (widget != NULL, FALSE);
g_return_val_if_fail (GTK_IS_MENU (widget), FALSE);
g_return_val_if_fail (event != NULL, FALSE);
if (GTK_WIDGET_DRAWABLE (widget))
{
gtk_menu_paint (widget);
(* GTK_WIDGET_CLASS (parent_class)->expose_event) (widget, event);
}
return FALSE;
}
static gboolean
gtk_menu_key_press (GtkWidget *widget,
GdkEventKey *event)
{
GtkMenuShell *menu_shell;
GtkMenu *menu;
gboolean delete = FALSE;
gchar *accel = NULL;
g_return_val_if_fail (widget != NULL, FALSE);
g_return_val_if_fail (GTK_IS_MENU (widget), FALSE);
g_return_val_if_fail (event != NULL, FALSE);
menu_shell = GTK_MENU_SHELL (widget);
menu = GTK_MENU (widget);
gtk_menu_stop_navigating_submenu (menu);
if (GTK_WIDGET_CLASS (parent_class)->key_press_event (widget, event))
return TRUE;
g_object_get (G_OBJECT (gtk_settings_get_default ()),
"gtk-menu-bar-accel",
&accel,
NULL);
if (accel)
{
guint keyval = 0;
GdkModifierType mods = 0;
gboolean handled = FALSE;
gtk_accelerator_parse (accel, &keyval, &mods);
if (keyval == 0)
g_warning ("Failed to parse menu bar accelerator '%s'\n", accel);
/* FIXME this is wrong, needs to be in the global accel resolution
* thing, to properly consider i18n etc., but that probably requires
* AccelGroup changes etc.
*/
if (event->keyval == keyval &&
(mods & event->state) == mods)
{
gtk_signal_emit_by_name (GTK_OBJECT (menu), "cancel");
}
g_free (accel);
if (handled)
return TRUE;
}
switch (event->keyval)
{
case GDK_Delete:
case GDK_KP_Delete:
case GDK_BackSpace:
delete = TRUE;
break;
default:
break;
}
/* Modify the accelerators */
if (menu_shell->active_menu_item &&
GTK_BIN (menu_shell->active_menu_item)->child &&
GTK_MENU_ITEM (menu_shell->active_menu_item)->submenu == NULL &&
!gtk_widget_accelerators_locked (menu_shell->active_menu_item) &&
(delete ||
(gtk_accelerator_valid (event->keyval, event->state) &&
(event->state ||
(event->keyval >= GDK_F1 && event->keyval <= GDK_F35)))))
{
GtkMenuItem *menu_item;
GtkAccelGroup *accel_group;
menu_item = GTK_MENU_ITEM (menu_shell->active_menu_item);
if (!GTK_MENU (widget)->accel_group)
accel_group = gtk_accel_group_get_default ();
else
accel_group = GTK_MENU (widget)->accel_group;
gtk_widget_remove_accelerators (GTK_WIDGET (menu_item),
gtk_signal_name (menu_item->accelerator_signal),
TRUE);
if (!delete &&
0 == gtk_widget_accelerator_signal (GTK_WIDGET (menu_item),
accel_group,
event->keyval,
event->state))
{
GSList *slist;
slist = gtk_accel_group_entries_from_object (GTK_OBJECT (menu_item));
while (slist)
{
GtkAccelEntry *ac_entry;
ac_entry = slist->data;
if (ac_entry->signal_id == menu_item->accelerator_signal)
break;
slist = slist->next;
}
if (!slist)
gtk_widget_add_accelerator (GTK_WIDGET (menu_item),
gtk_signal_name (menu_item->accelerator_signal),
accel_group,
event->keyval,
event->state,
GTK_ACCEL_VISIBLE);
}
}
return TRUE;
}
static gboolean
gtk_menu_motion_notify (GtkWidget *widget,
GdkEventMotion *event)
{
GtkWidget *menu_item;
GtkMenu *menu;
GtkMenuShell *menu_shell;
gboolean need_enter;
if (GTK_IS_MENU (widget))
gtk_menu_handle_scrolling (GTK_MENU (widget), TRUE);
/* We received the event for one of two reasons:
*
* a) We are the active menu, and did gtk_grab_add()
* b) The widget is a child of ours, and the event was propagated
*
* Since for computation of navigation regions, we want the menu which
* is the parent of the menu item, for a), we need to find that menu,
* which may be different from 'widget'.
*/
menu_item = gtk_get_event_widget ((GdkEvent*) event);
if (!menu_item || !GTK_IS_MENU_ITEM (menu_item) || !GTK_WIDGET_IS_SENSITIVE (menu_item) ||
!GTK_IS_MENU (menu_item->parent))
return FALSE;
menu_shell = GTK_MENU_SHELL (menu_item->parent);
menu = GTK_MENU (menu_shell);
need_enter = (menu->navigation_region != NULL || menu_shell->ignore_enter);
/* Check to see if we are within an active submenu's navigation region
*/
if (gtk_menu_navigating_submenu (menu, event->x_root, event->y_root))
return TRUE;
if (need_enter)
{
/* The menu is now sensitive to enter events on its items, but
* was previously sensitive. So we fake an enter event.
*/
gint width, height;
menu_shell->ignore_enter = FALSE;
gdk_window_get_size (event->window, &width, &height);
if (event->x >= 0 && event->x < width &&
event->y >= 0 && event->y < height)
{
GdkEvent send_event;
memset (&send_event, 0, sizeof (send_event));
send_event.crossing.type = GDK_ENTER_NOTIFY;
send_event.crossing.window = event->window;
send_event.crossing.time = event->time;
send_event.crossing.send_event = TRUE;
send_event.crossing.x_root = event->x_root;
send_event.crossing.y_root = event->y_root;
send_event.crossing.x = event->x;
send_event.crossing.y = event->y;
/* We send the event to 'widget', the currently active menu,
* instead of 'menu', the menu that the pointer is in. This
* will ensure that the event will be ignored unless the
* menuitem is a child of the active menu or some parent
* menu of the active menu.
*/
return gtk_widget_event (widget, &send_event);
}
}
return FALSE;
}
static gboolean
gtk_menu_scroll_timeout (gpointer data)
{
GtkMenu *menu;
GtkWidget *widget;
gint offset;
gint view_width, view_height;
menu = GTK_MENU (data);
widget = GTK_WIDGET (menu);
offset = menu->scroll_offset + menu->scroll_step;
/* If we scroll upward and the non-visible top part
* is smaller than the scroll arrow it would be
* pretty stupid to show the arrow and taking more
* screen space than just scrolling to the top.
*/
if ((menu->scroll_step < 0) && (offset < MENU_SCROLL_ARROW_HEIGHT))
offset = 0;
/* Don't scroll over the top if we weren't before: */
if ((menu->scroll_offset >= 0) && (offset < 0))
offset = 0;
gdk_window_get_size (widget->window, &view_width, &view_height);
/* Don't scroll past the bottom if we weren't before: */
if (menu->scroll_offset > 0)
view_height -= MENU_SCROLL_ARROW_HEIGHT;
if ((menu->scroll_offset + view_height <= widget->requisition.height) &&
(offset + view_height > widget->requisition.height))
offset = widget->requisition.height - view_height;
gtk_menu_scroll_to (menu, offset);
return TRUE;
}
static void
gtk_menu_handle_scrolling (GtkMenu *menu, gboolean enter)
{
GtkMenuShell *menu_shell;
gint width, height;
gint x, y;
gint border;
GdkRectangle rect;
gboolean in_arrow;
gboolean scroll_fast = FALSE;
menu_shell = GTK_MENU_SHELL (menu);
gdk_window_get_pointer (GTK_WIDGET (menu)->window, &x, &y, NULL);
gdk_window_get_size (GTK_WIDGET (menu)->window, &width, &height);
border = GTK_CONTAINER (menu)->border_width + GTK_WIDGET (menu)->style->ythickness;
if (menu->upper_arrow_visible && !menu->tearoff_active)
{
rect.x = 0;
rect.y = 0;
rect.width = width;
rect.height = MENU_SCROLL_ARROW_HEIGHT + border;
in_arrow = FALSE;
if ((x >= rect.x) && (x < rect.x + rect.width) &&
(y >= rect.y) && (y < rect.y + rect.height))
{
in_arrow = TRUE;
scroll_fast = (y < rect.y + MENU_SCROLL_FAST_ZONE);
}
if (enter && in_arrow &&
(!menu->upper_arrow_prelight || menu->scroll_fast != scroll_fast))
{
menu->upper_arrow_prelight = TRUE;
menu->scroll_fast = scroll_fast;
gdk_window_invalidate_rect (GTK_WIDGET (menu)->window, &rect, FALSE);
/* Deselect the active item so that any submenus are poped down */
gtk_menu_shell_deselect (menu_shell);
gtk_menu_stop_scrolling (menu);
menu->scroll_step = -MENU_SCROLL_STEP;
menu->timeout_id = g_timeout_add ((scroll_fast) ? MENU_SCROLL_TIMEOUT2 : MENU_SCROLL_TIMEOUT1,
gtk_menu_scroll_timeout,
menu);
}
else if (!enter && !in_arrow && menu->upper_arrow_prelight)
{
menu->upper_arrow_prelight = FALSE;
gdk_window_invalidate_rect (GTK_WIDGET (menu)->window, &rect, FALSE);
gtk_menu_stop_scrolling (menu);
}
}
if (menu->lower_arrow_visible && !menu->tearoff_active)
{
rect.x = 0;
rect.y = height - border - MENU_SCROLL_ARROW_HEIGHT;
rect.width = width;
rect.height = MENU_SCROLL_ARROW_HEIGHT + border;
in_arrow = FALSE;
if ((x >= rect.x) && (x < rect.x + rect.width) &&
(y >= rect.y) && (y < rect.y + rect.height))
{
in_arrow = TRUE;
scroll_fast = (y > rect.y + rect.height - MENU_SCROLL_FAST_ZONE);
}
if (enter && in_arrow &&
(!menu->lower_arrow_prelight || menu->scroll_fast != scroll_fast))
{
menu->lower_arrow_prelight = TRUE;
menu->scroll_fast = scroll_fast;
gdk_window_invalidate_rect (GTK_WIDGET (menu)->window, &rect, FALSE);
/* Deselect the active item so that any submenus are poped down */
gtk_menu_shell_deselect (menu_shell);
gtk_menu_stop_scrolling (menu);
menu->scroll_step = MENU_SCROLL_STEP;
menu->timeout_id = g_timeout_add ((scroll_fast) ? MENU_SCROLL_TIMEOUT2 : MENU_SCROLL_TIMEOUT1,
gtk_menu_scroll_timeout,
menu);
}
else if (!enter && !in_arrow && menu->lower_arrow_prelight)
{
menu->lower_arrow_prelight = FALSE;
gdk_window_invalidate_rect (GTK_WIDGET (menu)->window, &rect, FALSE);
gtk_menu_stop_scrolling (menu);
}
}
}
static gboolean
gtk_menu_enter_notify (GtkWidget *widget,
GdkEventCrossing *event)
{
GtkWidget *menu_item;
if (widget && GTK_IS_MENU (widget))
gtk_menu_handle_scrolling (GTK_MENU (widget), TRUE);
/* If this is a faked enter (see gtk_menu_motion_notify), 'widget'
* will not correspond to the event widget's parent. Check to see
* if we are in the parent's navigation region.
*/
menu_item = gtk_get_event_widget ((GdkEvent*) event);
if (menu_item && GTK_IS_MENU_ITEM (menu_item) && GTK_IS_MENU (menu_item->parent) &&
gtk_menu_navigating_submenu (GTK_MENU (menu_item->parent), event->x_root, event->y_root))
return TRUE;
return GTK_WIDGET_CLASS (parent_class)->enter_notify_event (widget, event);
}
static gboolean
gtk_menu_leave_notify (GtkWidget *widget,
GdkEventCrossing *event)
{
GtkMenuShell *menu_shell;
GtkMenu *menu;
GtkMenuItem *menu_item;
GtkWidget *event_widget;
menu = GTK_MENU (widget);
menu_shell = GTK_MENU_SHELL (widget);
if (gtk_menu_navigating_submenu (menu, event->x_root, event->y_root))
return TRUE;
gtk_menu_handle_scrolling (menu, FALSE);
event_widget = gtk_get_event_widget ((GdkEvent*) event);
if (!event_widget || !GTK_IS_MENU_ITEM (event_widget))
return TRUE;
menu_item = GTK_MENU_ITEM (event_widget);
/* Here we check to see if we're leaving an active menu item with a submenu,
* in which case we enter submenu navigation mode.
*/
if (menu_shell->active_menu_item != NULL
&& menu_item->submenu != NULL
&& menu_item->submenu_placement == GTK_LEFT_RIGHT)
{
if (menu_item->submenu->window != NULL)
{
gtk_menu_set_submenu_navigation_region (menu, menu_item, event);
return TRUE;
}
}
return GTK_WIDGET_CLASS (parent_class)->leave_notify_event (widget, event);
}
static void
gtk_menu_stop_navigating_submenu (GtkMenu *menu)
{
if (menu->navigation_region)
{
gdk_region_destroy (menu->navigation_region);
menu->navigation_region = NULL;
}
if (menu->navigation_timeout)
{
gtk_timeout_remove (menu->navigation_timeout);
menu->navigation_timeout = 0;
}
}
/* When the timeout is elapsed, the navigation region is destroyed
* and the menuitem under the pointer (if any) is selected.
*/
static gboolean
gtk_menu_stop_navigating_submenu_cb (gpointer user_data)
{
GtkMenu *menu = user_data;
GdkWindow *child_window;
gtk_menu_stop_navigating_submenu (menu);
if (GTK_WIDGET_REALIZED (menu))
{
child_window = gdk_window_get_pointer (GTK_WIDGET (menu)->window, NULL, NULL, NULL);
if (child_window)
{
GdkEventCrossing send_event;
memset (&send_event, 0, sizeof (send_event));
send_event.window = child_window;
send_event.type = GDK_ENTER_NOTIFY;
send_event.time = GDK_CURRENT_TIME; /* Bogus */
send_event.send_event = TRUE;
GTK_WIDGET_CLASS (parent_class)->enter_notify_event (GTK_WIDGET (menu), &send_event);
}
}
return FALSE;
}
static gboolean
gtk_menu_navigating_submenu (GtkMenu *menu,
gint event_x,
gint event_y)
{
if (menu->navigation_region)
{
if (gdk_region_point_in (menu->navigation_region, event_x, event_y))
return TRUE;
else
{
gtk_menu_stop_navigating_submenu (menu);
return FALSE;
}
}
return FALSE;
}
static void
gtk_menu_set_submenu_navigation_region (GtkMenu *menu,
GtkMenuItem *menu_item,
GdkEventCrossing *event)
{
gint submenu_left = 0;
gint submenu_right = 0;
gint submenu_top = 0;
gint submenu_bottom = 0;
gint width = 0;
gint height = 0;
GdkPoint point[3];
GtkWidget *event_widget;
g_return_if_fail (menu_item->submenu != NULL);
g_return_if_fail (event != NULL);
event_widget = gtk_get_event_widget ((GdkEvent*) event);
gdk_window_get_origin (menu_item->submenu->window, &submenu_left, &submenu_top);
gdk_window_get_size (menu_item->submenu->window, &width, &height);
submenu_right = submenu_left + width;
submenu_bottom = submenu_top + height;
gdk_window_get_size (event_widget->window, &width, &height);
if (event->x >= 0 && event->x < width)
{
/* Set navigation region */
/* We fudge/give a little padding in case the user
* ``misses the vertex'' of the triangle/is off by a pixel or two.
*/
if (menu_item->submenu_direction == GTK_DIRECTION_RIGHT)
point[0].x = event->x_root - SUBMENU_NAV_REGION_PADDING;
else
point[0].x = event->x_root + SUBMENU_NAV_REGION_PADDING;
/* Exiting the top or bottom? */
if (event->y < 0)
{ /* top */
point[0].y = event->y_root + SUBMENU_NAV_REGION_PADDING;
point[1].y = submenu_top;
if (point[0].y <= point[1].y)
return;
}
else
{ /* bottom */
point[0].y = event->y_root - SUBMENU_NAV_REGION_PADDING;
point[1].y = submenu_bottom;
if (point[0].y >= point[1].y)
return;
}
/* Submenu is to the left or right? */
if (menu_item->submenu_direction == GTK_DIRECTION_RIGHT)
point[1].x = submenu_left; /* right */
else
point[1].x = submenu_right; /* left */
point[2].x = point[1].x;
point[2].y = point[0].y;
gtk_menu_stop_navigating_submenu (menu);
menu->navigation_region = gdk_region_polygon (point, 3, GDK_WINDING_RULE);
menu->navigation_timeout = gtk_timeout_add (SUBMENU_NAV_HYSTERESIS_TIMEOUT,
gtk_menu_stop_navigating_submenu_cb, menu);
}
}
static void
gtk_menu_deactivate (GtkMenuShell *menu_shell)
{
GtkWidget *parent;
g_return_if_fail (menu_shell != NULL);
g_return_if_fail (GTK_IS_MENU (menu_shell));
parent = menu_shell->parent_menu_shell;
menu_shell->activate_time = 0;
gtk_menu_popdown (GTK_MENU (menu_shell));
if (parent)
gtk_menu_shell_deactivate (GTK_MENU_SHELL (parent));
}
static void
gtk_menu_position (GtkMenu *menu)
{
GtkWidget *widget;
GtkRequisition requisition;
gint x, y;
gint screen_width;
gint screen_height;
gint scroll_offset;
gint menu_height;
gboolean push_in;
g_return_if_fail (menu != NULL);
g_return_if_fail (GTK_IS_MENU (menu));
widget = GTK_WIDGET (menu);
screen_width = gdk_screen_width ();
screen_height = gdk_screen_height ();
gdk_window_get_pointer (NULL, &x, &y, NULL);
/* We need the requisition to figure out the right place to
* popup the menu. In fact, we always need to ask here, since
* if a size_request was queued while we weren't popped up,
* the requisition won't have been recomputed yet.
*/
gtk_widget_size_request (widget, &requisition);
push_in = FALSE;
if (menu->position_func)
(* menu->position_func) (menu, &x, &y, &push_in, menu->position_func_data);
else
{
x = CLAMP (x - 2, 0, MAX (0, screen_width - requisition.width));
y = CLAMP (y - 2, 0, MAX (0, screen_height - requisition.height));
}
scroll_offset = 0;
if (push_in)
{
menu_height = GTK_WIDGET (menu)->requisition.height;
if (y + menu_height > screen_height)
{
scroll_offset -= y + menu_height - screen_height;
y = screen_height - menu_height;
}
if (y < 0)
{
scroll_offset -= y;
y = 0;
}
}
if (y + requisition.height > screen_height)
requisition.height = screen_height - y;
if (y < 0)
{
scroll_offset -= y;
requisition.height -= -y;
y = 0;
}
if (scroll_offset > 0)
scroll_offset += MENU_SCROLL_ARROW_HEIGHT;
/* FIXME: The MAX() here is because gtk_widget_set_uposition
* is broken. Once we provide an alternate interface that
* allows negative values, then we can remove them.
*/
x = MAX (x, 0);
gtk_widget_set_uposition (GTK_MENU_SHELL (menu)->active ?
menu->toplevel : menu->tearoff_window,
x, y);
gtk_widget_set_usize (GTK_MENU_SHELL (menu)->active ?
menu->toplevel : menu->tearoff_hbox,
-1, requisition.height);
menu->scroll_offset = scroll_offset;
}
static void
gtk_menu_stop_scrolling (GtkMenu *menu)
{
if (menu->timeout_id)
{
g_source_remove (menu->timeout_id);
menu->timeout_id = 0;
}
}
static void
gtk_menu_scroll_to (GtkMenu *menu,
gint offset)
{
GtkWidget *widget;
gint x, y;
gint view_width, view_height;
gint border_width;
gboolean last_visible;
gint menu_height;
widget = GTK_WIDGET (menu);
if (menu->tearoff_active &&
menu->tearoff_adjustment &&
(menu->tearoff_adjustment->value != offset))
{
menu->tearoff_adjustment->value = offset;
gtk_adjustment_value_changed (menu->tearoff_adjustment);
}
/* Scroll the menu: */
gdk_window_move (menu->bin_window, 0, -offset);
/* Move/resize the viewport according to arrows: */
gdk_window_get_size (widget->window, &view_width, &view_height);
border_width = GTK_CONTAINER (menu)->border_width;
view_width -= (border_width + widget->style->xthickness) * 2;
view_height -= (border_width + widget->style->ythickness) * 2;
menu_height = widget->requisition.height - (border_width + widget->style->ythickness) * 2;
x = border_width + widget->style->xthickness;
y = border_width + widget->style->ythickness;
if (!menu->tearoff_active)
{
last_visible = menu->upper_arrow_visible;
menu->upper_arrow_visible = (offset > 0);
if (menu->upper_arrow_visible)
view_height -= MENU_SCROLL_ARROW_HEIGHT;
if ( (last_visible != menu->upper_arrow_visible) &&
!menu->upper_arrow_visible)
{
menu->upper_arrow_prelight = FALSE;
/* If we hid the upper arrow, possibly remove timeout */
if (menu->scroll_step < 0)
gtk_menu_stop_scrolling (menu);
}
last_visible = menu->lower_arrow_visible;
menu->lower_arrow_visible = (view_height + offset < menu_height);
if (menu->lower_arrow_visible)
view_height -= MENU_SCROLL_ARROW_HEIGHT;
if ( (last_visible != menu->lower_arrow_visible) &&
!menu->lower_arrow_visible)
{
menu->lower_arrow_prelight = FALSE;
/* If we hid the lower arrow, possibly remove timeout */
if (menu->scroll_step > 0)
gtk_menu_stop_scrolling (menu);
}
if (menu->upper_arrow_visible)
y += MENU_SCROLL_ARROW_HEIGHT;
}
gdk_window_move_resize (menu->view_window,
x,
y,
view_width,
view_height);
menu->scroll_offset = offset;
}
static void
gtk_menu_select_item (GtkMenuShell *menu_shell,
GtkWidget *menu_item)
{
GtkMenu *menu;
GtkWidget *child;
GList *children;
GtkRequisition child_requisition;
gint child_offset, child_height;
gint width, height;
gint y;
gint arrow_height;
gboolean last_child = 0;
g_return_if_fail (menu_shell != NULL);
g_return_if_fail (GTK_IS_MENU (menu_shell));
menu = GTK_MENU (menu_shell);
/* We need to check if the selected item fully visible.
* If not we need to scroll the menu so that it becomes fully
* visible.
*/
child = NULL;
child_offset = 0;
child_height = 0;
children = menu_shell->children;
while (children)
{
child = children->data;
children = children->next;
if (GTK_WIDGET_VISIBLE (child))
{
gtk_widget_size_request (child, &child_requisition);
child_offset += child_height;
child_height = child_requisition.height;
}
if (child == menu_item)
{
last_child = (children == NULL);
break;
}
}
if (child == menu_item)
{
y = menu->scroll_offset;
gdk_window_get_size (GTK_WIDGET (menu)->window, &width, &height);
height -= 2*GTK_CONTAINER (menu)->border_width + 2*GTK_WIDGET (menu)->style->ythickness;
if (child_offset + child_height <= y)
{
/* Ignore the enter event we might get if the pointer is on the menu
*/
menu_shell->ignore_enter = TRUE;
gtk_menu_scroll_to (menu, child_offset);
}
else
{
arrow_height = 0;
if (menu->upper_arrow_visible && !menu->tearoff_active)
arrow_height += MENU_SCROLL_ARROW_HEIGHT;
if (menu->lower_arrow_visible && !menu->tearoff_active)
arrow_height += MENU_SCROLL_ARROW_HEIGHT;
if (child_offset >= y + height - arrow_height)
{
arrow_height = 0;
if (!last_child && !menu->tearoff_active)
arrow_height += MENU_SCROLL_ARROW_HEIGHT;
y = child_offset + child_height - height + arrow_height;
if ((y > 0) && !menu->tearoff_active)
{
/* Need upper arrow */
arrow_height += MENU_SCROLL_ARROW_HEIGHT;
y = child_offset + child_height - height + arrow_height;
}
/* Ignore the enter event we might get if the pointer is on the menu
*/
menu_shell->ignore_enter = TRUE;
gtk_menu_scroll_to (menu, y);
}
}
}
GTK_MENU_SHELL_CLASS (parent_class)->select_item (menu_shell, menu_item);
}
/* Reparent the menu, taking care of the refcounting
*
* If unrealize is true we force a unrealize while reparenting the parent.
* This can help eliminate flicker in some cases.
*
* What happens is that when the menu is unrealized and then re-realized,
* the allocations are as follows:
*
* parent - 1x1 at (0,0)
* child1 - 100x20 at (0,0)
* child2 - 100x20 at (0,20)
* child3 - 100x20 at (0,40)
*
* That is, the parent is small but the children are full sized. Then,
* when the queued_resize gets processed, the parent gets resized to
* full size.
*
* But in order to eliminate flicker when scrolling, gdkgeometry-x11.c
* contains the following logic:
*
* - if a move or resize operation on a window would change the clip
* region on the children, then before the window is resized
* the background for children is temporarily set to None, the
* move/resize done, and the background for the children restored.
*
* So, at the point where the parent is resized to final size, the
* background for the children is temporarily None, and thus they
* are not cleared to the background color and the previous background
* (the image of the menu) is left in place.
*/
static void
gtk_menu_reparent (GtkMenu *menu,
GtkWidget *new_parent,
gboolean unrealize)
{
GtkObject *object = GTK_OBJECT (menu);
GtkWidget *widget = GTK_WIDGET (menu);
gboolean was_floating = GTK_OBJECT_FLOATING (object);
gtk_object_ref (object);
gtk_object_sink (object);
if (unrealize)
{
gtk_object_ref (object);
gtk_container_remove (GTK_CONTAINER (widget->parent), widget);
gtk_container_add (GTK_CONTAINER (new_parent), widget);
gtk_object_unref (object);
}
else
gtk_widget_reparent (GTK_WIDGET (menu), new_parent);
if (was_floating)
GTK_OBJECT_SET_FLAGS (object, GTK_FLOATING);
else
gtk_object_unref (object);
}
static void
gtk_menu_show_all (GtkWidget *widget)
{
g_return_if_fail (widget != NULL);
g_return_if_fail (GTK_IS_MENU (widget));
/* Show children, but not self. */
gtk_container_foreach (GTK_CONTAINER (widget), (GtkCallback) gtk_widget_show_all, NULL);
}
static void
gtk_menu_hide_all (GtkWidget *widget)
{
g_return_if_fail (widget != NULL);
g_return_if_fail (GTK_IS_MENU (widget));
/* Hide children, but not self. */
gtk_container_foreach (GTK_CONTAINER (widget), (GtkCallback) gtk_widget_hide_all, NULL);
}
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