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      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 #ifndef ASH_WM_APP_LIST_CONTROLLER_H_
      6 #define ASH_WM_APP_LIST_CONTROLLER_H_
      7 
      8 #include "ash/launcher/launcher_icon_observer.h"
      9 #include "ash/shell_observer.h"
     10 #include "base/basictypes.h"
     11 #include "base/compiler_specific.h"
     12 #include "base/timer/timer.h"
     13 #include "ui/app_list/pagination_model_observer.h"
     14 #include "ui/aura/client/focus_change_observer.h"
     15 #include "ui/aura/window_observer.h"
     16 #include "ui/base/events/event_handler.h"
     17 #include "ui/compositor/layer_animation_observer.h"
     18 #include "ui/gfx/rect.h"
     19 #include "ui/views/widget/widget_observer.h"
     20 
     21 namespace app_list {
     22 class ApplicationDragAndDropHost;
     23 class AppListView;
     24 class PaginationModel;
     25 }
     26 
     27 namespace ui {
     28 class LocatedEvent;
     29 }
     30 
     31 namespace ash {
     32 namespace internal {
     33 
     34 // AppListController is a controller that manages app list UI for shell.
     35 // It creates AppListView and schedules showing/hiding animation.
     36 // While the UI is visible, it monitors things such as app list widget's
     37 // activation state and desktop mouse click to auto dismiss the UI.
     38 class AppListController : public ui::EventHandler,
     39                           public aura::client::FocusChangeObserver,
     40                           public aura::WindowObserver,
     41                           public ui::ImplicitAnimationObserver,
     42                           public views::WidgetObserver,
     43                           public ShellObserver,
     44                           public LauncherIconObserver,
     45                           public app_list::PaginationModelObserver {
     46  public:
     47   AppListController();
     48   virtual ~AppListController();
     49 
     50   // Show/hide app list window. The |window| is used to deterime in
     51   // which display (in which the |window| exists) the app list should
     52   // be shown.
     53   void SetVisible(bool visible, aura::Window* window);
     54 
     55   // Whether app list window is visible (shown or being shown).
     56   bool IsVisible() const;
     57 
     58   // Returns target visibility. This differs from IsVisible() if an animation
     59   // is ongoing.
     60   bool GetTargetVisibility() const { return is_visible_; }
     61 
     62   // Returns app list window or NULL if it is not visible.
     63   aura::Window* GetWindow();
     64 
     65  private:
     66   // If |drag_and_drop_host| is not NULL it will be called upon drag and drop
     67   // operations outside the application list.
     68   void SetDragAndDropHostOfCurrentAppList(
     69       app_list::ApplicationDragAndDropHost* drag_and_drop_host);
     70 
     71   // Sets the app list view and attempts to show it.
     72   void SetView(app_list::AppListView* view);
     73 
     74   // Forgets the view.
     75   void ResetView();
     76 
     77   // Starts show/hide animation.
     78   void ScheduleAnimation();
     79 
     80   void ProcessLocatedEvent(ui::LocatedEvent* event);
     81 
     82   // Makes app list bubble update its bounds.
     83   void UpdateBounds();
     84 
     85   // ui::EventHandler overrides:
     86   virtual void OnMouseEvent(ui::MouseEvent* event) OVERRIDE;
     87   virtual void OnGestureEvent(ui::GestureEvent* event) OVERRIDE;
     88 
     89   // aura::client::FocusChangeObserver overrides:
     90   virtual void OnWindowFocused(aura::Window* gained_focus,
     91                                aura::Window* lost_focus) OVERRIDE;
     92 
     93   // aura::WindowObserver overrides:
     94   virtual void OnWindowBoundsChanged(aura::Window* root,
     95                                      const gfx::Rect& old_bounds,
     96                                      const gfx::Rect& new_bounds) OVERRIDE;
     97 
     98   // ui::ImplicitAnimationObserver overrides:
     99   virtual void OnImplicitAnimationsCompleted() OVERRIDE;
    100 
    101   // views::WidgetObserver overrides:
    102   virtual void OnWidgetDestroying(views::Widget* widget) OVERRIDE;
    103 
    104   // ShellObserver overrides:
    105   virtual void OnShelfAlignmentChanged(aura::RootWindow* root_window) OVERRIDE;
    106 
    107   // LauncherIconObserver overrides:
    108   virtual void OnLauncherIconPositionsChanged() OVERRIDE;
    109 
    110   // app_list::PaginationModelObserver overrides:
    111   virtual void TotalPagesChanged() OVERRIDE;
    112   virtual void SelectedPageChanged(int old_selected, int new_selected) OVERRIDE;
    113   virtual void TransitionStarted() OVERRIDE;
    114   virtual void TransitionChanged() OVERRIDE;
    115 
    116   scoped_ptr<app_list::PaginationModel> pagination_model_;
    117 
    118   // Whether we should show or hide app list widget.
    119   bool is_visible_;
    120 
    121   // The AppListView this class manages, owned by its widget.
    122   app_list::AppListView* view_;
    123 
    124   // Cached bounds of |view_| for snapping back animation after over-scroll.
    125   gfx::Rect view_bounds_;
    126 
    127   // Whether should schedule snap back animation.
    128   bool should_snap_back_;
    129 
    130   DISALLOW_COPY_AND_ASSIGN(AppListController);
    131 };
    132 
    133 }  // namespace internal
    134 }  // namespace ash
    135 
    136 #endif  // ASH_WM_APP_LIST_CONTROLLER_H_
    137