[Aura] Implement views-based applist.

ui/aura_shell/app_list.h

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef UI_AURA_SHELL_APP_LIST_H_
-#define UI_AURA_SHELL_APP_LIST_H_
-#pragma once
-
-#include "base/basictypes.h"
-#include "base/compiler_specific.h"
-#include "base/memory/weak_ptr.h"
-#include "ui/aura/event_filter.h"
-#include "ui/gfx/compositor/layer_animation_observer.h"
-#include "ui/views/widget/widget.h"
-
-namespace aura_shell {
-namespace internal {
-
-// AppList is a controller that manages app list UI for shell. To show the UI,
-// it requests app list widget from ShellDelegate and shows it when ready.
-// While the UI is visible, it monitors things such as app list widget's
-// activation state and desktop mouse click to auto dismiss the UI.
-class AppList : public aura::EventFilter,
-                public ui::LayerAnimationObserver,
-                public views::Widget::Observer {
- public:
-  AppList();
-  virtual ~AppList();
-
-  // Show/hide app list window.
-  void SetVisible(bool visible);
-
-  // Whether app list window is visible (shown or being shown).
-  bool IsVisible();
-
- private:
-  // Sets app list widget. If we are in visible mode, start showing animation.
-  // Otherwise, we just close the widget.
-  void SetWidget(views::Widget* widget);
-
-  // Forgets the widget.
-  void ResetWidget();
-
-  // Starts show/hide animation.
-  void ScheduleAnimation();
-
-  // aura::EventFilter overrides:
-  virtual bool PreHandleKeyEvent(aura::Window* target,
-                                 aura::KeyEvent* event) OVERRIDE;
-  virtual bool PreHandleMouseEvent(aura::Window* target,
-                                   aura::MouseEvent* event) OVERRIDE;
-  virtual ui::TouchStatus PreHandleTouchEvent(aura::Window* target,
-                                              aura::TouchEvent* event) OVERRIDE;
-
-  // ui::LayerAnimationObserver overrides:
-  virtual void OnLayerAnimationEnded(
-      const ui::LayerAnimationSequence* sequence) OVERRIDE;
-  virtual void OnLayerAnimationAborted(
-      const ui::LayerAnimationSequence* sequence) OVERRIDE;
-  virtual void OnLayerAnimationScheduled(
-      const ui::LayerAnimationSequence* sequence) OVERRIDE;
-
-  // views::Widget::Observer overrides:
-  virtual void OnWidgetClosing(views::Widget* widget) OVERRIDE;
-  virtual void OnWidgetActivationChanged(views::Widget* widget,
-      bool active) OVERRIDE;
-
-  // Whether we should show or hide app list widget.
-  bool is_visible_;
-
-  // App list widget we get from ShellDelegate.
-  views::Widget* widget_;
-
-  // A weak ptr factory for callbacks that ShellDelegate used to set widget.
-  base::WeakPtrFactory<AppList> set_widget_factory_;
-
-  DISALLOW_COPY_AND_ASSIGN(AppList);
-};
-
-}  // namespace internal
-}  // namespace aura_shell
-
-#endif  //  UI_AURA_SHELL_APP_LIST_H_