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