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      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 #ifndef ATHENA_WM_TITLE_DRAG_CONTROLLER_H_
      6 #define ATHENA_WM_TITLE_DRAG_CONTROLLER_H_
      7 
      8 #include "base/macros.h"
      9 #include "base/memory/scoped_ptr.h"
     10 #include "base/memory/weak_ptr.h"
     11 #include "ui/aura/window_tracker.h"
     12 #include "ui/events/event_handler.h"
     13 #include "ui/gfx/geometry/point.h"
     14 
     15 namespace aura {
     16 class Window;
     17 }
     18 
     19 namespace wm {
     20 class Shadow;
     21 }
     22 
     23 namespace athena {
     24 
     25 class TitleDragControllerDelegate {
     26  public:
     27   virtual ~TitleDragControllerDelegate() {}
     28 
     29   // Returns the window behind |window|. The returned window is the one that
     30   // would be revealed while |window|'s title is dragged.
     31   virtual aura::Window* GetWindowBehind(aura::Window* window) = 0;
     32 
     33   // Notifies the delegate during various stages of the drag.
     34   virtual void OnTitleDragStarted(aura::Window* window) = 0;
     35   virtual void OnTitleDragCompleted(aura::Window* window) = 0;
     36   virtual void OnTitleDragCanceled(aura::Window* window) = 0;
     37 };
     38 
     39 // Responsible for allowing dragging a window by its title bar.
     40 class TitleDragController : public ui::EventHandler {
     41  public:
     42   TitleDragController(aura::Window* container,
     43                       TitleDragControllerDelegate* delegate);
     44   virtual ~TitleDragController();
     45 
     46  private:
     47   void EndTransition(aura::Window* window, bool complete);
     48   void OnTransitionEnd(aura::Window* window, bool complete);
     49 
     50   // ui::EventHandler:
     51   virtual void OnGestureEvent(ui::GestureEvent* gesture) OVERRIDE;
     52 
     53   aura::Window* container_;
     54   TitleDragControllerDelegate* delegate_;
     55   gfx::Point drag_start_location_;
     56   scoped_ptr<wm::Shadow> shadow_;
     57   aura::WindowTracker tracker_;
     58 
     59   base::WeakPtrFactory<TitleDragController> weak_ptr_;
     60 
     61   DISALLOW_COPY_AND_ASSIGN(TitleDragController);
     62 };
     63 
     64 }  // namespace athena
     65 
     66 #endif  // ATHENA_WM_TITLE_DRAG_CONTROLLER_H_
     67