Draggable peeking/fullscreen launcher with transparent background.

ash/shelf/shelf.h

 // Copyright 2016 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 ASH_SHELF_SHELF_H_
 #define ASH_SHELF_SHELF_H_
 
 #include <memory>
 
 #include "ash/ash_export.h"
 #include "ash/public/cpp/shelf_types.h"
 #include "ash/shelf/shelf_layout_manager_observer.h"
 #include "ash/shelf/shelf_locking_manager.h"
+#include "ash/shell_observer.h"
 #include "base/observer_list.h"
 
 namespace aura {
 class Window;
 }
 
 namespace gfx {
 class Rect;
 }
 
 namespace ui {
 class GestureEvent;
 }
 
 namespace ash {
 
 enum class AnimationChangeType;
 class ShelfBezelEventHandler;
 class ShelfLayoutManager;
 class ShelfLayoutManagerTest;
 class ShelfLockingManager;
 class ShelfView;
 class ShelfWidget;
 class StatusAreaWidget;
 class ShelfObserver;
 
 // Controller for the shelf state. One per display, because each display might
 // have different shelf alignment, autohide, etc. Exists for the lifetime of the
 // root window controller.
-class ASH_EXPORT Shelf : public ShelfLayoutManagerObserver {
+class ASH_EXPORT Shelf : public ShelfLayoutManagerObserver, ShellObserver {
  public:
   Shelf();
   ~Shelf() override;
 
   // Returns the shelf for the display that |window| is on. Note that the shelf
   // widget may not exist, or the shelf may not be visible.
   static Shelf* ForWindow(aura::Window* window);
 
   // Returns if shelf alignment options are enabled, and the user is able to
   // adjust the alignment (eg. not allowed in guest and supervised user modes).
@@ skipping 77 matching lines @@
   void AddObserver(ShelfObserver* observer);
   void RemoveObserver(ShelfObserver* observer);
 
   void NotifyShelfIconPositionsChanged();
   StatusAreaWidget* GetStatusAreaWidget() const;
 
   void SetVirtualKeyboardBoundsForTesting(const gfx::Rect& bounds);
   ShelfLockingManager* GetShelfLockingManagerForTesting();
   ShelfView* GetShelfViewForTesting();
 
+  // Called when the app list status changes.
+  void OnAppListIsActive();
+
  protected:
   // ShelfLayoutManagerObserver:
   void WillDeleteShelfLayoutManager() override;
   void WillChangeVisibilityState(ShelfVisibilityState new_state) override;
   void OnAutoHideStateChanged(ShelfAutoHideState new_state) override;
   void OnBackgroundUpdated(ShelfBackgroundType background_type,
                            AnimationChangeType change_type) override;
 
  private:
   class AutoHideEventHandler;
   friend class ShelfLayoutManagerTest;
 
+  // ShellObserver overrides:
+  void OnAppListShownOrDismissed(bool shown,
+                                 aura::Window* root_window) override;
+
   // Layout manager for the shelf container window. Instances are constructed by
   // ShelfWidget and lifetimes are managed by the container windows themselves.
   ShelfLayoutManager* shelf_layout_manager_ = nullptr;
 
   std::unique_ptr<ShelfWidget> shelf_widget_;
 
   // These initial values hide the shelf until user preferences are available.
   ShelfAlignment alignment_ = SHELF_ALIGNMENT_BOTTOM_LOCKED;
   ShelfAutoHideBehavior auto_hide_behavior_ = SHELF_AUTO_HIDE_ALWAYS_HIDDEN;
 
   // Sets shelf alignment to bottom during login and screen lock.
   ShelfLockingManager shelf_locking_manager_;
 
   base::ObserverList<ShelfObserver> observers_;
 
   // Forwards mouse and gesture events to ShelfLayoutManager for auto-hide.
   // TODO(mash): Facilitate simliar functionality in mash: crbug.com/631216
   std::unique_ptr<AutoHideEventHandler> auto_hide_event_handler_;
 
   // Forwards touch gestures on a bezel sensor to the shelf.
   // TODO(mash): Facilitate simliar functionality in mash: crbug.com/636647
   std::unique_ptr<ShelfBezelEventHandler> bezel_event_handler_;
 
   DISALLOW_COPY_AND_ASSIGN(Shelf);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELF_SHELF_H_