chrome/browser/ui/gtk/gtk_custom_menu.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/browser/ui/gtk/gtk_custom_menu.h"
   6
   7 #include "chrome/browser/ui/gtk/gtk_custom_menu_item.h"
   8
   9 G_DEFINE_TYPE(GtkCustomMenu, gtk_custom_menu, GTK_TYPE_MENU)
  10
  11 // Stolen directly from gtkmenushell.c. I'd love to call the library version
  12 // instead, but it's static and isn't exported. :(
  13 static gint gtk_menu_shell_is_item(GtkMenuShell* menu_shell,
  14                                    GtkWidget* child) {
  15   GtkWidget *parent;
  16
  17   g_return_val_if_fail(GTK_IS_MENU_SHELL(menu_shell), FALSE);
  18   g_return_val_if_fail(child != NULL, FALSE);
  19
  20   parent = gtk_widget_get_parent(child);
  21   while (GTK_IS_MENU_SHELL(parent)) {
  22     if (parent == reinterpret_cast<GtkWidget*>(menu_shell))
  23       return TRUE;
  24     parent = GTK_MENU_SHELL(parent)->parent_menu_shell;
  25   }
  26
  27   return FALSE;
  28 }
  29
  30 // Stolen directly from gtkmenushell.c. I'd love to call the library version
  31 // instead, but it's static and isn't exported. :(
  32 static GtkWidget* gtk_menu_shell_get_item(GtkMenuShell* menu_shell,
  33                                           GdkEvent* event) {
  34   GtkWidget* menu_item = gtk_get_event_widget(event);
  35
  36   while (menu_item && !GTK_IS_MENU_ITEM(menu_item))
  37     menu_item = gtk_widget_get_parent(menu_item);
  38
  39   if (menu_item && gtk_menu_shell_is_item(menu_shell, menu_item))
  40     return menu_item;
  41   else
  42     return NULL;
  43 }
  44
  45 // When processing a button event, abort processing if the cursor isn't in a
  46 // clickable region.
  47 static gboolean gtk_custom_menu_button_press(GtkWidget* widget,
  48                                              GdkEventButton* event) {
  49   GtkWidget* menu_item = gtk_menu_shell_get_item(
  50       GTK_MENU_SHELL(widget), reinterpret_cast<GdkEvent*>(event));
  51   if (GTK_IS_CUSTOM_MENU_ITEM(menu_item)) {
  52     if (!gtk_custom_menu_item_is_in_clickable_region(
  53             GTK_CUSTOM_MENU_ITEM(menu_item))) {
  54       return TRUE;
  55     }
  56   }
  57
  58   return GTK_WIDGET_CLASS(gtk_custom_menu_parent_class)->
  59       button_press_event(widget, event);
  60 }
  61
  62 // When processing a button event, abort processing if the cursor isn't in a
  63 // clickable region. If it's in a button that doesn't dismiss the menu, fire
  64 // that event and abort having the normal GtkMenu code run.
  65 static gboolean gtk_custom_menu_button_release(GtkWidget* widget,
  66                                                GdkEventButton* event) {
  67   GtkWidget* menu_item = gtk_menu_shell_get_item(
  68       GTK_MENU_SHELL(widget), reinterpret_cast<GdkEvent*>(event));
  69   if (GTK_IS_CUSTOM_MENU_ITEM(menu_item)) {
  70     if (!gtk_custom_menu_item_is_in_clickable_region(
  71             GTK_CUSTOM_MENU_ITEM(menu_item))) {
  72       // Stop processing this event. This isn't a clickable region.
  73       return TRUE;
  74     }
  75
  76     if (gtk_custom_menu_item_try_no_dismiss_command(
  77             GTK_CUSTOM_MENU_ITEM(menu_item))) {
  78       return TRUE;
  79     }
  80   }
  81
  82   return GTK_WIDGET_CLASS(gtk_custom_menu_parent_class)->
  83       button_release_event(widget, event);
  84 }
  85
  86 // Manually forward button press events to the menu item (and then do what we'd
  87 // do normally).
  88 static gboolean gtk_custom_menu_motion_notify(GtkWidget* widget,
  89                                               GdkEventMotion* event) {
  90   GtkWidget* menu_item = gtk_menu_shell_get_item(
  91       GTK_MENU_SHELL(widget), (GdkEvent*)event);
  92   if (GTK_IS_CUSTOM_MENU_ITEM(menu_item)) {
  93     gtk_custom_menu_item_receive_motion_event(GTK_CUSTOM_MENU_ITEM(menu_item),
  94                                               event->x, event->y);
  95   }
  96
  97   return GTK_WIDGET_CLASS(gtk_custom_menu_parent_class)->
  98       motion_notify_event(widget, event);
  99 }
 100
 101 static void gtk_custom_menu_move_current(GtkMenuShell* menu_shell,
 102                                          GtkMenuDirectionType direction) {
 103   // If the currently selected item is custom, we give it first chance to catch
 104   // up/down events.
 105
 106   // TODO(erg): We are breaking a GSEAL by directly accessing this. We'll need
 107   // to fix this by the time gtk3 comes out.
 108   GtkWidget* menu_item = GTK_MENU_SHELL(menu_shell)->active_menu_item;
 109   if (GTK_IS_CUSTOM_MENU_ITEM(menu_item)) {
 110     switch (direction) {
 111       case GTK_MENU_DIR_PREV:
 112       case GTK_MENU_DIR_NEXT:
 113         if (gtk_custom_menu_item_handle_move(GTK_CUSTOM_MENU_ITEM(menu_item),
 114                                              direction))
 115           return;
 116         break;
 117       default:
 118         break;
 119     }
 120   }
 121
 122   GTK_MENU_SHELL_CLASS(gtk_custom_menu_parent_class)->
 123       move_current(menu_shell, direction);
 124
 125   // In the case of hitting PREV and transitioning to a custom menu, we want to
 126   // make sure we're selecting the final item in the list, not the first one.
 127   menu_item = GTK_MENU_SHELL(menu_shell)->active_menu_item;
 128   if (GTK_IS_CUSTOM_MENU_ITEM(menu_item)) {
 129     gtk_custom_menu_item_select_item_by_direction(
 130         GTK_CUSTOM_MENU_ITEM(menu_item), direction);
 131   }
 132 }
 133
 134 static void gtk_custom_menu_init(GtkCustomMenu* menu) {
 135 }
 136
 137 static void gtk_custom_menu_class_init(GtkCustomMenuClass* klass) {
 138   GtkWidgetClass* widget_class = GTK_WIDGET_CLASS(klass);
 139   GtkMenuShellClass* menu_shell_class = GTK_MENU_SHELL_CLASS(klass);
 140
 141   widget_class->button_press_event = gtk_custom_menu_button_press;
 142   widget_class->button_release_event = gtk_custom_menu_button_release;
 143   widget_class->motion_notify_event = gtk_custom_menu_motion_notify;
 144
 145   menu_shell_class->move_current = gtk_custom_menu_move_current;
 146 }
 147
 148 GtkWidget* gtk_custom_menu_new() {
 149   return GTK_WIDGET(g_object_new(GTK_TYPE_CUSTOM_MENU, NULL));
 150 }