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authorJavier <dev.git@javispedro.com>2014-01-28 16:50:47 +0100
committerJavier <dev.git@javispedro.com>2014-01-28 16:50:47 +0100
commitc2d6d46b9ca89cb1c0729ee599c3566d3d1e7cf7 (patch)
tree7e1e2285437816c06ac884d68284d854413cf41e /module/main.c
downloadtopmenu-gtk-c2d6d46b9ca89cb1c0729ee599c3566d3d1e7cf7.tar.gz
topmenu-gtk-c2d6d46b9ca89cb1c0729ee599c3566d3d1e7cf7.zip
initial import
Diffstat (limited to 'module/main.c')
-rw-r--r--module/main.c724
1 files changed, 724 insertions, 0 deletions
diff --git a/module/main.c b/module/main.c
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index 0000000..42ea332
--- /dev/null
+++ b/module/main.c
@@ -0,0 +1,724 @@
+/*
+ * Copyright 2012 Canonical Ltd.
+ *
+ * This program 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, version 3 of the License.
+ *
+ * This program 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 program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors: Ryan Lortie <desrt@desrt.ca>
+ * William Hua <william.hua@canonical.com>
+ */
+
+#include <gtk/gtk.h>
+#include <gdk/gdkx.h>
+
+#include "../global.h"
+#include "../libtopmenu-client/topmenu-client.h"
+#include "../libtopmenu-client/topmenu-monitor.h"
+
+#include "menuitem-proxy.h"
+#include "appmenu.h"
+#include "data.h"
+
+static gboolean already_initialized = FALSE;
+
+static void (* pre_hijacked_window_realize) (GtkWidget *widget);
+
+static void (* pre_hijacked_window_unrealize) (GtkWidget *widget);
+
+#if GTK_MAJOR_VERSION == 3
+static void (* pre_hijacked_application_window_realize) (GtkWidget *widget);
+#endif
+
+static void (* pre_hijacked_menu_bar_realize) (GtkWidget *widget);
+
+static void (* pre_hijacked_menu_bar_unrealize) (GtkWidget *widget);
+
+static void (* pre_hijacked_widget_size_allocate) (GtkWidget *widget,
+ GtkAllocation *allocation);
+
+static void (* pre_hijacked_menu_bar_size_allocate) (GtkWidget *widget,
+ GtkAllocation *allocation);
+
+#if GTK_MAJOR_VERSION == 2
+static void (* pre_hijacked_menu_bar_size_request) (GtkWidget *widget,
+ GtkRequisition *requisition);
+#elif GTK_MAJOR_VERSION == 3
+static void (* pre_hijacked_menu_bar_get_preferred_width) (GtkWidget *widget,
+ gint *minimum_width,
+ gint *natural_width);
+
+static void (* pre_hijacked_menu_bar_get_preferred_height) (GtkWidget *widget,
+ gint *minimum_height,
+ gint *natural_height);
+
+static void (* pre_hijacked_menu_bar_get_preferred_width_for_height) (GtkWidget *widget,
+ gint height,
+ gint *minimum_width,
+ gint *natural_width);
+
+static void (* pre_hijacked_menu_bar_get_preferred_height_for_width) (GtkWidget *widget,
+ gint width,
+ gint *minimum_height,
+ gint *natural_height);
+#endif
+
+static void
+handle_should_hide_menubar_updated (GObject *object,
+ GParamSpec *pspec,
+ gpointer user_data);
+
+static void
+count_container_items_helper (GtkWidget *widget, gpointer data)
+{
+ gint *count = data;
+ (*count)++;
+}
+
+static gint
+count_container_items (GtkContainer *container)
+{
+ gint count = 0;
+ gtk_container_foreach (container, count_container_items_helper, &count);
+ return count;
+}
+
+
+
+
+static gboolean
+topmenu_should_hide_menubar_on_window (GtkWindow *window)
+{
+ TopMenuMonitor *monitor = topmenu_monitor_get_instance ();
+
+ if (topmenu_is_window_blacklisted (window))
+ return FALSE;
+
+ return monitor->available;
+}
+
+static gboolean
+topmenu_should_hide_menubar (GtkWidget *widget)
+{
+ GtkWindow *window = GTK_WINDOW (gtk_widget_get_toplevel (widget));
+
+ g_return_val_if_fail (GTK_IS_MENU_SHELL (widget), FALSE);
+
+ return topmenu_should_hide_menubar_on_window (window);
+}
+
+static void
+topmenu_prepare_window (GtkWindow *window)
+{
+ WindowData *window_data;
+
+ g_return_if_fail (GTK_IS_WINDOW (window));
+ g_return_if_fail (gtk_widget_get_realized (GTK_WIDGET (window)));
+
+ window_data = topmenu_get_window_data (window);
+
+ if (window_data == NULL)
+ return; // Window is ignored
+
+ if (window_data->appmenubar != 0)
+ return; // Already prepared
+
+ window_data->appmenubar = TOPMENU_APP_MENU_BAR (topmenu_app_menu_bar_new ());
+ gtk_widget_show(GTK_WIDGET(window_data->appmenubar));
+
+ topmenu_app_menu_bar_set_app_menu (window_data->appmenubar,
+ topmenu_appmenu_build(&window_data->appmenu));
+}
+
+static void
+topmenu_connect_window (GtkWindow *window)
+{
+ WindowData *window_data;
+
+ g_return_if_fail (GTK_IS_WINDOW (window));
+ g_return_if_fail (gtk_widget_get_realized (GTK_WIDGET (window)));
+
+ window_data = topmenu_get_window_data (window);
+
+ if (window_data == NULL)
+ return; // Window is ignored
+
+ if (window_data->monitor_connection_id != 0)
+ return; // Already connected
+
+ g_return_if_fail (window_data->menus != NULL); // Must contain one menu at least.
+ g_return_if_fail (window_data->appmenubar != NULL); // Must be prepared
+
+ TopMenuMonitor *monitor = topmenu_monitor_get_instance();
+ window_data->monitor_connection_id = g_signal_connect(monitor, "notify::available",
+ G_CALLBACK (handle_should_hide_menubar_updated), window);
+
+ topmenu_client_connect_window_widget (gtk_widget_get_window (GTK_WIDGET (window)),
+ GTK_WIDGET (window_data->appmenubar));
+}
+
+static void
+topmenu_disconnect_window (GtkWindow *window)
+{
+ WindowData *window_data;
+
+ g_return_if_fail (GTK_IS_WINDOW (window));
+
+ window_data = topmenu_get_window_data (window);
+
+ if (window_data == NULL)
+ return; // Already disconnected or ignored
+
+ if (window_data->monitor_connection_id == 0)
+ return; // Already disconnected
+
+ TopMenuMonitor *monitor = topmenu_monitor_get_instance();
+ g_signal_handler_disconnect(monitor, window_data->monitor_connection_id);
+ window_data->monitor_connection_id = 0;
+
+ if (window_data->appmenu.menu)
+ topmenu_appmenu_destroy(&window_data->appmenu);
+
+ if (window_data->appmenubar)
+ {
+ gtk_widget_destroy (GTK_WIDGET (window_data->appmenubar));
+ window_data->appmenubar = NULL;
+ }
+
+ if (gtk_widget_get_realized (GTK_WIDGET(window)))
+ {
+ topmenu_client_disconnect_window (gtk_widget_get_window (GTK_WIDGET (window)));
+ }
+}
+
+static gint
+compute_shell_position_in_appmenu (WindowData *window_data, GtkMenuShell *menu_shell)
+{
+ GSList *iter;
+ gint position = 1; // Skip app_menu_item
+
+ for (iter = window_data->menus; iter; iter = g_slist_next (iter))
+ {
+ if (iter->data == menu_shell) {
+ return position;
+ }
+
+ position += count_container_items (GTK_CONTAINER (iter->data));
+ }
+
+ return -1;
+}
+
+static void
+add_menu_item_to_appmenu (WindowData *window_data, GtkMenuItem *item, gint position)
+{
+ MenuItemData *item_data = topmenu_get_menu_item_data (item);
+ item_data->proxy = topmenu_create_proxy_menu_item (item);
+
+ gtk_menu_shell_insert (GTK_MENU_SHELL (window_data->appmenubar),
+ GTK_WIDGET (item_data->proxy), position);
+}
+
+static void
+remove_menu_item_from_appmenu (WindowData *window_data, GtkMenuItem *item)
+{
+ MenuItemData *item_data = topmenu_get_menu_item_data (item);
+
+ if (item_data->proxy) {
+ gtk_widget_destroy (GTK_WIDGET (item_data->proxy));
+ item_data->proxy = NULL;
+ }
+}
+
+static void
+handle_shell_insert (GtkMenuShell *menu_shell, GtkWidget *child, gint position, WindowData *window_data)
+{
+ GtkMenuItem *item = GTK_MENU_ITEM (child);
+ gint offset = compute_shell_position_in_appmenu (window_data, menu_shell);
+ g_return_if_fail (offset >= 0);
+
+ add_menu_item_to_appmenu (window_data, item, offset + position);
+}
+
+static void
+handle_shell_remove (GtkMenuShell *menu_shell, GtkWidget *widget, WindowData *window_data)
+{
+ GtkMenuItem *item = GTK_MENU_ITEM (widget);
+ remove_menu_item_from_appmenu (window_data, item);
+}
+
+typedef struct _AddShellCbData
+{
+ WindowData *window_data;
+ gint position;
+} AddShellCbData;
+
+static void
+add_shell_cb (GtkWidget *widget, gpointer user_data)
+{
+ AddShellCbData *data = user_data;
+ GtkMenuItem *item = GTK_MENU_ITEM (widget);
+ add_menu_item_to_appmenu (data->window_data, item, data->position);
+
+ data->position++;
+}
+
+static void
+add_shell_to_appmenu (WindowData *window_data, GtkMenuShell *menu_shell)
+{
+ AddShellCbData data;
+ data.window_data = window_data;
+ data.position = compute_shell_position_in_appmenu (window_data, menu_shell);
+
+ g_warn_if_fail (data.position >= 0);
+
+ gtk_container_foreach (GTK_CONTAINER (menu_shell),
+ add_shell_cb, &data);
+
+ topmenu_appmenu_scan_for_items (&window_data->appmenu, menu_shell);
+
+ g_signal_connect (menu_shell, "insert",
+ G_CALLBACK (handle_shell_insert), window_data);
+ g_signal_connect (menu_shell, "remove",
+ G_CALLBACK (handle_shell_remove), window_data);
+}
+
+static void
+remove_shell_cb (GtkWidget *widget, gpointer user_data)
+{
+ WindowData *window_data = user_data;
+ GtkMenuItem *item = GTK_MENU_ITEM (widget);
+ remove_menu_item_from_appmenu (window_data, item);
+}
+
+static void
+remove_shell_from_appmenu (WindowData *window_data, GtkMenuShell *menu_shell)
+{
+ gtk_container_foreach (GTK_CONTAINER (menu_shell),
+ remove_shell_cb, window_data);
+
+ g_signal_handlers_disconnect_by_data (menu_shell, window_data);
+}
+
+static void
+topmenu_disconnect_menu_shell (GtkWindow *window,
+ GtkMenuShell *menu_shell)
+{
+ WindowData *window_data;
+ MenuShellData *menu_shell_data;
+
+ g_return_if_fail (GTK_IS_WINDOW (window));
+ g_return_if_fail (GTK_IS_MENU_SHELL (menu_shell));
+
+ menu_shell_data = topmenu_get_menu_shell_data (menu_shell);
+
+ g_warn_if_fail (window == menu_shell_data->window);
+
+ window_data = topmenu_get_window_data (menu_shell_data->window);
+
+ if (window_data != NULL)
+ {
+ GSList *iter;
+
+ for (iter = window_data->menus; iter != NULL; iter = g_slist_next (iter))
+ if (GTK_MENU_SHELL(iter->data) == menu_shell)
+ break;
+
+ if (iter != NULL)
+ {
+ GtkMenuShell *menu_shell = GTK_MENU_SHELL(iter->data);
+
+ remove_shell_from_appmenu (window_data, menu_shell);
+
+ window_data->menus = g_slist_delete_link (window_data->menus, iter);
+ }
+ }
+
+ menu_shell_data->window = NULL;
+}
+
+static void
+topmenu_connect_menu_shell (GtkWindow *window,
+ GtkMenuShell *menu_shell)
+{
+ MenuShellData *menu_shell_data;
+
+ g_return_if_fail (GTK_IS_WINDOW (window));
+ g_return_if_fail (GTK_IS_MENU_SHELL (menu_shell));
+
+ menu_shell_data = topmenu_get_menu_shell_data (menu_shell);
+
+ if (window != menu_shell_data->window)
+ {
+ WindowData *window_data;
+
+ if (menu_shell_data->window != NULL)
+ topmenu_disconnect_menu_shell (menu_shell_data->window, menu_shell);
+
+ window_data = topmenu_get_window_data (window);
+
+ if (window_data != NULL)
+ {
+ GSList *iter;
+
+ for (iter = window_data->menus; iter != NULL; iter = g_slist_next (iter))
+ if (GTK_MENU_SHELL(iter->data) == menu_shell)
+ break;
+
+ if (iter == NULL)
+ {
+ topmenu_prepare_window (window);
+
+ window_data->menus = g_slist_append (window_data->menus, menu_shell);
+
+ add_shell_to_appmenu (window_data, menu_shell);
+
+ topmenu_connect_window (window); // Does nothing if already connected
+ }
+ }
+
+ menu_shell_data->window = window;
+ }
+}
+
+static void
+handle_should_hide_menubar_updated (GObject *object,
+ GParamSpec *pspec,
+ gpointer user_data)
+{
+ g_return_if_fail (GTK_IS_WINDOW (user_data));
+
+ GtkWindow *window = GTK_WINDOW (user_data);
+ WindowData *window_data = topmenu_get_window_data (window);
+ GSList *iter;
+
+ for (iter = window_data->menus; iter != NULL; iter = g_slist_next (iter))
+ {
+ gtk_widget_queue_resize (GTK_WIDGET (iter->data));
+ }
+}
+
+static void
+hijacked_window_realize (GtkWidget *widget)
+{
+ g_return_if_fail (GTK_IS_WINDOW (widget));
+
+ if (pre_hijacked_window_realize != NULL)
+ (* pre_hijacked_window_realize) (widget);
+
+#if GTK_MAJOR_VERSION == 3
+ if (!GTK_IS_APPLICATION_WINDOW (widget))
+#endif
+ topmenu_get_window_data (GTK_WINDOW (widget));
+}
+
+static void
+hijacked_window_unrealize (GtkWidget *widget)
+{
+ g_return_if_fail (GTK_IS_WINDOW (widget));
+
+ if (pre_hijacked_window_unrealize != NULL)
+ (* pre_hijacked_window_unrealize) (widget);
+
+ topmenu_disconnect_window (GTK_WINDOW (widget));
+ topmenu_remove_window_data (GTK_WINDOW (widget));
+}
+
+#if GTK_MAJOR_VERSION == 3
+static void
+hijacked_application_window_realize (GtkWidget *widget)
+{
+ g_return_if_fail (GTK_IS_APPLICATION_WINDOW (widget));
+
+ if (pre_hijacked_application_window_realize != NULL)
+ (* pre_hijacked_application_window_realize) (widget);
+
+ gtk_window_get_window_data (GTK_WINDOW (widget));
+}
+#endif
+
+static void
+hijacked_menu_bar_realize (GtkWidget *widget)
+{
+ GtkWidget *window;
+
+ g_return_if_fail (GTK_IS_MENU_BAR (widget));
+
+ if (pre_hijacked_menu_bar_realize != NULL)
+ (* pre_hijacked_menu_bar_realize) (widget);
+
+ window = gtk_widget_get_toplevel (widget);
+
+ if (GTK_IS_WINDOW (window))
+ topmenu_connect_menu_shell (GTK_WINDOW (window), GTK_MENU_SHELL (widget));
+}
+
+static void
+hijacked_menu_bar_unrealize (GtkWidget *widget)
+{
+ MenuShellData *menu_shell_data;
+
+ g_return_if_fail (GTK_IS_MENU_BAR (widget));
+
+ if (pre_hijacked_menu_bar_unrealize != NULL)
+ (* pre_hijacked_menu_bar_unrealize) (widget);
+
+ menu_shell_data = topmenu_get_menu_shell_data (GTK_MENU_SHELL (widget));
+
+ if (menu_shell_data->window != NULL)
+ topmenu_disconnect_menu_shell (menu_shell_data->window, GTK_MENU_SHELL (widget));
+}
+
+static void
+hijacked_menu_bar_size_allocate (GtkWidget *widget,
+ GtkAllocation *allocation)
+{
+ GtkAllocation zero = { 0, 0, 0, 0 };
+ GdkWindow *window;
+
+ g_return_if_fail (GTK_IS_MENU_BAR (widget));
+
+ if (topmenu_should_hide_menubar (widget))
+ {
+ /*
+ * We manually assign an empty allocation to the menu bar to
+ * prevent the container from attempting to draw it at all.
+ */
+ if (pre_hijacked_widget_size_allocate != NULL)
+ (* pre_hijacked_widget_size_allocate) (widget, &zero);
+
+ /*
+ * Then we move the GdkWindow belonging to the menu bar outside of
+ * the clipping rectangle of the parent window so that we can't
+ * see it.
+ */
+ window = gtk_widget_get_window (widget);
+
+ if (window != NULL)
+ gdk_window_move_resize (window, -1, -1, 1, 1);
+ }
+ else if (pre_hijacked_menu_bar_size_allocate != NULL)
+ (* pre_hijacked_menu_bar_size_allocate) (widget, allocation);
+}
+
+#if GTK_MAJOR_VERSION == 2
+static void
+hijacked_menu_bar_size_request (GtkWidget *widget,
+ GtkRequisition *requisition)
+{
+ g_return_if_fail (GTK_IS_MENU_BAR (widget));
+
+ if (pre_hijacked_menu_bar_size_request != NULL)
+ (* pre_hijacked_menu_bar_size_request) (widget, requisition);
+
+ if (topmenu_should_hide_menubar(widget))
+ {
+ requisition->width = 0;
+ requisition->height = 0;
+ }
+}
+#elif GTK_MAJOR_VERSION == 3
+static void
+hijacked_menu_bar_get_preferred_width (GtkWidget *widget,
+ gint *minimum_width,
+ gint *natural_width)
+{
+ g_return_if_fail (GTK_IS_MENU_BAR (widget));
+
+ if (pre_hijacked_menu_bar_get_preferred_width != NULL)
+ (* pre_hijacked_menu_bar_get_preferred_width) (widget, minimum_width, natural_width);
+
+ if (gtk_widget_shell_shows_menubar (widget))
+ {
+ *minimum_width = 0;
+ *natural_width = 0;
+ }
+}
+
+static void
+hijacked_menu_bar_get_preferred_height (GtkWidget *widget,
+ gint *minimum_height,
+ gint *natural_height)
+{
+ g_return_if_fail (GTK_IS_MENU_BAR (widget));
+
+ if (pre_hijacked_menu_bar_get_preferred_height != NULL)
+ (* pre_hijacked_menu_bar_get_preferred_height) (widget, minimum_height, natural_height);
+
+ if (gtk_widget_shell_shows_menubar (widget))
+ {
+ *minimum_height = 0;
+ *natural_height = 0;
+ }
+}
+
+static void
+hijacked_menu_bar_get_preferred_width_for_height (GtkWidget *widget,
+ gint height,
+ gint *minimum_width,
+ gint *natural_width)
+{
+ g_return_if_fail (GTK_IS_MENU_BAR (widget));
+
+ if (pre_hijacked_menu_bar_get_preferred_width_for_height != NULL)
+ (* pre_hijacked_menu_bar_get_preferred_width_for_height) (widget, height, minimum_width, natural_width);
+
+ if (gtk_widget_shell_shows_menubar (widget))
+ {
+ *minimum_width = 0;
+ *natural_width = 0;
+ }
+}
+
+static void
+hijacked_menu_bar_get_preferred_height_for_width (GtkWidget *widget,
+ gint width,
+ gint *minimum_height,
+ gint *natural_height)
+{
+ g_return_if_fail (GTK_IS_MENU_BAR (widget));
+
+ if (pre_hijacked_menu_bar_get_preferred_height_for_width != NULL)
+ (* pre_hijacked_menu_bar_get_preferred_height_for_width) (widget, width, minimum_height, natural_height);
+
+ if (gtk_widget_shell_shows_menubar (widget))
+ {
+ *minimum_height = 0;
+ *natural_height = 0;
+ }
+}
+#endif
+
+static void
+hijack_window_class_vtable (GType type)
+{
+ GtkWidgetClass *widget_class = g_type_class_ref (type);
+ GType *children;
+ guint n;
+ guint i;
+
+ if (widget_class->realize == pre_hijacked_window_realize)
+ widget_class->realize = hijacked_window_realize;
+
+#if GTK_MAJOR_VERSION == 3
+ if (widget_class->realize == pre_hijacked_application_window_realize)
+ widget_class->realize = hijacked_application_window_realize;
+#endif
+
+ if (widget_class->unrealize == pre_hijacked_window_unrealize)
+ widget_class->unrealize = hijacked_window_unrealize;
+
+ children = g_type_children (type, &n);
+
+ for (i = 0; i < n; i++)
+ hijack_window_class_vtable (children[i]);
+
+ g_free (children);
+}
+
+static void
+hijack_menu_bar_class_vtable (GType type)
+{
+ GtkWidgetClass *widget_class = g_type_class_ref (type);
+ GType *children;
+ guint n;
+ guint i;
+
+ /* This fixes lp:1113008. */
+ widget_class->hierarchy_changed = NULL;
+
+ if (widget_class->realize == pre_hijacked_menu_bar_realize)
+ widget_class->realize = hijacked_menu_bar_realize;
+
+ if (widget_class->unrealize == pre_hijacked_menu_bar_unrealize)
+ widget_class->unrealize = hijacked_menu_bar_unrealize;
+
+ if (widget_class->size_allocate == pre_hijacked_menu_bar_size_allocate)
+ widget_class->size_allocate = hijacked_menu_bar_size_allocate;
+
+#if GTK_MAJOR_VERSION == 2
+ if (widget_class->size_request == pre_hijacked_menu_bar_size_request)
+ widget_class->size_request = hijacked_menu_bar_size_request;
+#elif GTK_MAJOR_VERSION == 3
+ if (widget_class->get_preferred_width == pre_hijacked_menu_bar_get_preferred_width)
+ widget_class->get_preferred_width = hijacked_menu_bar_get_preferred_width;
+
+ if (widget_class->get_preferred_height == pre_hijacked_menu_bar_get_preferred_height)
+ widget_class->get_preferred_height = hijacked_menu_bar_get_preferred_height;
+
+ if (widget_class->get_preferred_width_for_height == pre_hijacked_menu_bar_get_preferred_width_for_height)
+ widget_class->get_preferred_width_for_height = hijacked_menu_bar_get_preferred_width_for_height;
+
+ if (widget_class->get_preferred_height_for_width == pre_hijacked_menu_bar_get_preferred_height_for_width)
+ widget_class->get_preferred_height_for_width = hijacked_menu_bar_get_preferred_height_for_width;
+#endif
+
+ children = g_type_children (type, &n);
+
+ for (i = 0; i < n; i++)
+ hijack_menu_bar_class_vtable (children[i]);
+
+ g_free (children);
+}
+
+G_MODULE_EXPORT
+void gtk_module_init(void)
+{
+ if (!topmenu_is_blacklisted())
+ {
+ GtkWidgetClass *widget_class;
+
+ /* gtk_module_init may be called more than once in a resident module */
+ g_return_if_fail(!already_initialized);
+ already_initialized = TRUE;
+
+ /* store the base GtkWidget size_allocate vfunc */
+ widget_class = g_type_class_ref (GTK_TYPE_WIDGET);
+ pre_hijacked_widget_size_allocate = widget_class->size_allocate;
+
+#if GTK_MAJOR_VERSION == 3
+ /* store the base GtkApplicationWindow realize vfunc */
+ widget_class = g_type_class_ref (GTK_TYPE_APPLICATION_WINDOW);
+ pre_hijacked_application_window_realize = widget_class->realize;
+#endif
+
+ /* intercept window realize vcalls on GtkWindow */
+ widget_class = g_type_class_ref (GTK_TYPE_WINDOW);
+ pre_hijacked_window_realize = widget_class->realize;
+ pre_hijacked_window_unrealize = widget_class->unrealize;
+ hijack_window_class_vtable (GTK_TYPE_WINDOW);
+
+ /* intercept size request and allocate vcalls on GtkMenuBar (for hiding) */
+ widget_class = g_type_class_ref (GTK_TYPE_MENU_BAR);
+ pre_hijacked_menu_bar_realize = widget_class->realize;
+ pre_hijacked_menu_bar_unrealize = widget_class->unrealize;
+ pre_hijacked_menu_bar_size_allocate = widget_class->size_allocate;
+#if GTK_MAJOR_VERSION == 2
+ pre_hijacked_menu_bar_size_request = widget_class->size_request;
+#elif GTK_MAJOR_VERSION == 3
+ pre_hijacked_menu_bar_get_preferred_width = widget_class->get_preferred_width;
+ pre_hijacked_menu_bar_get_preferred_height = widget_class->get_preferred_height;
+ pre_hijacked_menu_bar_get_preferred_width_for_height = widget_class->get_preferred_width_for_height;
+ pre_hijacked_menu_bar_get_preferred_height_for_width = widget_class->get_preferred_height_for_width;
+#endif
+ hijack_menu_bar_class_vtable (GTK_TYPE_MENU_BAR);
+ }
+}
+
+G_MODULE_EXPORT
+const gchar * g_module_check_init(GModule *module)
+{
+ /* It is hard to unhijack Gtk's vtables, specially if some other module
+ * has decided to also hijack them.
+ * Thus, we just prevent unloading of this module. */
+ g_module_make_resident(module);
+ return NULL;
+}