src/ui/views/controls/menu/display_change_listener_aura.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 "ui/aura/window.h"
   6 #include "ui/aura/window_observer.h"
   7 #include "ui/views/controls/menu/menu_runner.h"
   8 #include "ui/views/widget/widget.h"
   9
  10 namespace views {
  11 namespace internal {
  12
  13 // DisplayChangeListener implementation for aura. Cancels the menu any time the
  14 // root window bounds change.
  15 class AuraDisplayChangeListener
  16     : public DisplayChangeListener,
  17       public aura::WindowObserver {
  18  public:
  19   AuraDisplayChangeListener(Widget* widget, MenuRunner* menu_runner);
  20   ~AuraDisplayChangeListener() override;
  21
  22   // aura::WindowObserver overrides:
  23   void OnWindowBoundsChanged(aura::Window* window,
  24                              const gfx::Rect& old_bounds,
  25                              const gfx::Rect& new_bounds) override;
  26   void OnWindowDestroying(aura::Window* window) override;
  27
  28  private:
  29   MenuRunner* menu_runner_;
  30   aura::Window* root_window_;
  31
  32   DISALLOW_COPY_AND_ASSIGN(AuraDisplayChangeListener);
  33 };
  34
  35 AuraDisplayChangeListener::AuraDisplayChangeListener(Widget* widget,
  36                                                      MenuRunner* menu_runner)
  37     : menu_runner_(menu_runner),
  38       root_window_(widget->GetNativeView()->GetRootWindow()) {
  39   if (root_window_)
  40     root_window_->AddObserver(this);
  41 }
  42
  43 AuraDisplayChangeListener::~AuraDisplayChangeListener() {
  44   if (root_window_)
  45     root_window_->RemoveObserver(this);
  46 }
  47
  48 void AuraDisplayChangeListener::OnWindowBoundsChanged(
  49     aura::Window* window,
  50     const gfx::Rect& old_bounds,
  51     const gfx::Rect& new_bounds) {
  52   menu_runner_->Cancel();
  53 }
  54
  55 void AuraDisplayChangeListener::OnWindowDestroying(aura::Window* window) {
  56   DCHECK_EQ(window, root_window_);
  57   root_window_->RemoveObserver(this);
  58   root_window_ = NULL;
  59 }
  60
  61 // static
  62 DisplayChangeListener* DisplayChangeListener::Create(Widget* widget,
  63                                                      MenuRunner* runner) {
  64   return new AuraDisplayChangeListener(widget, runner);
  65 }
  66
  67 }  // namespace internal
  68 }  // namespace views