ui/views/controls/menu/menu_event_dispatcher.cc

   1 // Copyright 2014 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 "ui/views/controls/menu/menu_event_dispatcher.h"
   6
   7 #include "base/memory/scoped_ptr.h"
   8 #include "ui/aura/window.h"
   9 #include "ui/events/event_utils.h"
  10 #include "ui/events/keycodes/keyboard_code_conversion.h"
  11 #include "ui/events/keycodes/keyboard_codes.h"
  12 #include "ui/views/controls/menu/menu_controller.h"
  13 #include "ui/views/widget/widget.h"
  14
  15 namespace views {
  16 namespace internal {
  17
  18 MenuEventDispatcher::MenuEventDispatcher(MenuController* controller)
  19     : menu_controller_(controller) {}
  20
  21 MenuEventDispatcher::~MenuEventDispatcher() {}
  22
  23 bool MenuEventDispatcher::CanDispatchEvent(const ui::PlatformEvent& event) {
  24   return true;
  25 }
  26
  27 uint32_t MenuEventDispatcher::DispatchEvent(const ui::PlatformEvent& event) {
  28   bool should_quit = false;
  29   bool should_perform_default = true;
  30   bool should_process_event = true;
  31
  32   // Check if the event should be handled.
  33   scoped_ptr<ui::Event> ui_event(ui::EventFromNative(event));
  34   if (ui_event && menu_controller_->owner()) {
  35     aura::Window* menu_window = menu_controller_->owner()->GetNativeWindow();
  36     aura::Window* target_window = static_cast<aura::Window*>(
  37         static_cast<ui::EventTarget*>(menu_window->GetRootWindow())->
  38             GetEventTargeter()->FindTargetForEvent(menu_window,
  39                                                    ui_event.get()));
  40     // TODO(flackr): The event shouldn't be handled if target_window is not
  41     // menu_window, however the event targeter does not properly target the
  42     // open menu. For now, we allow targeters to prevent handling by the menu.
  43     if (!target_window)
  44       should_process_event = false;
  45   }
  46
  47   if (menu_controller_->exit_type() == MenuController::EXIT_ALL ||
  48       menu_controller_->exit_type() == MenuController::EXIT_DESTROYED) {
  49     should_quit = true;
  50   } else if (ui_event && should_process_event) {
  51     switch (ui_event->type()) {
  52       case ui::ET_KEY_PRESSED: {
  53         ui::KeyEvent* key_event = static_cast<ui::KeyEvent*>(ui_event.get());
  54         if (!menu_controller_->OnKeyDown(key_event->key_code())) {
  55           should_quit = true;
  56           should_perform_default = false;
  57           break;
  58         }
  59
  60         // Do not check mnemonics if the Alt or Ctrl modifiers are pressed.
  61         int flags = key_event->flags();
  62         if ((flags & (ui::EF_CONTROL_DOWN | ui::EF_ALT_DOWN)) == 0) {
  63           char c = ui::GetCharacterFromKeyCode(key_event->key_code(), flags);
  64           if (menu_controller_->SelectByChar(c)) {
  65             should_quit = true;
  66             should_perform_default = false;
  67             break;
  68           }
  69         }
  70         should_quit = false;
  71         should_perform_default = false;
  72         break;
  73       }
  74       case ui::ET_KEY_RELEASED:
  75         should_quit = false;
  76         should_perform_default = false;
  77         break;
  78       case ui::ET_TOUCH_RELEASED:
  79       case ui::ET_TOUCH_CANCELLED:
  80         // Don't allow the event copy to clear the native touch id
  81         // mapping, or we'll lose the mapping before the initial event
  82         // has finished being dispatched.
  83         static_cast<ui::TouchEvent*>(ui_event.get())
  84             ->set_should_remove_native_touch_id_mapping(false);
  85         break;
  86       default:
  87         break;
  88     }
  89   }
  90
  91   if (should_quit || menu_controller_->exit_type() != MenuController::EXIT_NONE)
  92     menu_controller_->TerminateNestedMessageLoop();
  93
  94   return should_perform_default ? ui::POST_DISPATCH_PERFORM_DEFAULT
  95                                 : ui::POST_DISPATCH_NONE;
  96 }
  97
  98 }  // namespace internal
  99 }  // namespace views