1// Copyright (c) 2011 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
9G_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. :(
13static 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 = child->parent;
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. :(
32static 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 = menu_item->parent;
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.
47static 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.
65static 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).
88static 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
101static 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
134static void gtk_custom_menu_init(GtkCustomMenu* menu) {
135}
136
137static 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
148GtkWidget* gtk_custom_menu_new() {
149  return GTK_WIDGET(g_object_new(GTK_TYPE_CUSTOM_MENU, NULL));
150}
151