athena/wm/title_drag_controller.h

   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   ~TitleDragController() override;
  45
  46  private:
  47   void EndTransition(aura::Window* window, bool complete);
  48   void OnTransitionEnd(aura::Window* window, bool complete);
  49
  50   // ui::EventHandler:
  51   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_