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      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 "ui/gfx/point.h"
     12 
     13 namespace ash {
     14 namespace internal {
     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                                    aura::Window* window,
     29                                    const gfx::Point& location,
     30                                    int window_component,
     31                                    aura::client::WindowMoveSource source);
     32 
     33   // WindowResizer:
     34   virtual void Drag(const gfx::Point& location, int event_flags) OVERRIDE;
     35   virtual void CompleteDrag(int event_flags) OVERRIDE;
     36   virtual void RevertDrag() OVERRIDE;
     37   virtual aura::Window* GetTarget() OVERRIDE;
     38   virtual const gfx::Point& GetInitialLocation() const OVERRIDE;
     39 
     40  private:
     41   FRIEND_TEST_ALL_PREFIXES(DragWindowResizerTest, DragWindowController);
     42 
     43   // Creates DragWindowResizer that adds the ability of dragging windows across
     44   // displays to |next_window_resizer|. This object takes the ownership of
     45   // |next_window_resizer|.
     46   explicit DragWindowResizer(WindowResizer* next_window_resizer,
     47                              const Details& details);
     48 
     49   // Updates the bounds of the phantom window for window dragging. Set true on
     50   // |in_original_root| if the pointer is still in |window()->GetRootWindow()|.
     51   void UpdateDragWindow(const gfx::Rect& bounds, bool in_original_root);
     52 
     53   // Returns true if we should allow the mouse pointer to warp.
     54   bool ShouldAllowMouseWarp();
     55 
     56   scoped_ptr<WindowResizer> next_window_resizer_;
     57 
     58   // Shows a semi-transparent image of the window being dragged.
     59   scoped_ptr<DragWindowController> drag_window_controller_;
     60 
     61   const Details details_;
     62 
     63   gfx::Point last_mouse_location_;
     64 
     65   // If non-NULL the destructor sets this to true. Used to determine if this has
     66   // been deleted.
     67   bool* destroyed_;
     68 
     69   // Current instance for use by the DragWindowResizerTest.
     70   static DragWindowResizer* instance_;
     71 
     72   DISALLOW_COPY_AND_ASSIGN(DragWindowResizer);
     73 };
     74 
     75 }  // namespace internal
     76 }  // namespace aura
     77 
     78 #endif  // ASH_WM_DRAG_WINDOW_RESIZER_H_
     79