ash/wm/drag_window_resizer.h

   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_DRAG_WINDOW_RESIZER_H_
   6 #define ASH_WM_DRAG_WINDOW_RESIZER_H_
   7
   8 #include "ash/wm/window_resizer.h"
   9 #include "base/compiler_specific.h"
  10 #include "base/gtest_prod_util.h"
  11 #include "base/memory/weak_ptr.h"
  12 #include "ui/gfx/point.h"
  13
  14 namespace ash {
  15
  16 class DragWindowController;
  17
  18 // DragWindowResizer is a decorator of WindowResizer and adds the ability to
  19 // drag windows across displays.
  20 class ASH_EXPORT DragWindowResizer : public WindowResizer {
  21  public:
  22   virtual ~DragWindowResizer();
  23
  24   // Creates a new DragWindowResizer. The caller takes ownership of the
  25   // returned object. The ownership of |next_window_resizer| is taken by the
  26   // returned object. Returns NULL if not resizable.
  27   static DragWindowResizer* Create(WindowResizer* next_window_resizer,
  28                                    wm::WindowState* window_state);
  29
  30   // WindowResizer:
  31   virtual void Drag(const gfx::Point& location, int event_flags) OVERRIDE;
  32   virtual void CompleteDrag() OVERRIDE;
  33   virtual void RevertDrag() OVERRIDE;
  34
  35  private:
  36   FRIEND_TEST_ALL_PREFIXES(DragWindowResizerTest, DragWindowController);
  37
  38   // Creates DragWindowResizer that adds the ability of dragging windows across
  39   // displays to |next_window_resizer|. This object takes the ownership of
  40   // |next_window_resizer|.
  41   explicit DragWindowResizer(WindowResizer* next_window_resizer,
  42                              wm::WindowState* window_state);
  43
  44   // Updates the bounds of the phantom window for window dragging. Set true on
  45   // |in_original_root| if the pointer is still in |window()->GetRootWindow()|.
  46   void UpdateDragWindow(const gfx::Rect& bounds, bool in_original_root);
  47
  48   // Returns true if we should allow the mouse pointer to warp.
  49   bool ShouldAllowMouseWarp();
  50
  51   scoped_ptr<WindowResizer> next_window_resizer_;
  52
  53   // Shows a semi-transparent image of the window being dragged.
  54   scoped_ptr<DragWindowController> drag_window_controller_;
  55
  56   gfx::Point last_mouse_location_;
  57
  58   // Current instance for use by the DragWindowResizerTest.
  59   static DragWindowResizer* instance_;
  60
  61   base::WeakPtrFactory<DragWindowResizer> weak_ptr_factory_;
  62
  63   DISALLOW_COPY_AND_ASSIGN(DragWindowResizer);
  64 };
  65
  66 }  // namespace ash
  67
  68 #endif  // ASH_WM_DRAG_WINDOW_RESIZER_H_