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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 "base/memory/weak_ptr.h"
     12 #include "ui/gfx/point.h"
     13 
     14 namespace ash {
     15 namespace internal {
     16 
     17 class DragWindowController;
     18 class TrayUser;
     19 
     20 // DragWindowResizer is a decorator of WindowResizer and adds the ability to
     21 // drag windows across displays.
     22 class ASH_EXPORT DragWindowResizer : public WindowResizer {
     23  public:
     24   virtual ~DragWindowResizer();
     25 
     26   // Creates a new DragWindowResizer. The caller takes ownership of the
     27   // returned object. The ownership of |next_window_resizer| is taken by the
     28   // returned object. Returns NULL if not resizable.
     29   static DragWindowResizer* Create(WindowResizer* next_window_resizer,
     30                                    aura::Window* window,
     31                                    const gfx::Point& location,
     32                                    int window_component,
     33                                    aura::client::WindowMoveSource source);
     34 
     35   // WindowResizer:
     36   virtual void Drag(const gfx::Point& location, int event_flags) OVERRIDE;
     37   virtual void CompleteDrag(int event_flags) OVERRIDE;
     38   virtual void RevertDrag() OVERRIDE;
     39   virtual aura::Window* GetTarget() OVERRIDE;
     40   virtual const gfx::Point& GetInitialLocation() const OVERRIDE;
     41 
     42  private:
     43   FRIEND_TEST_ALL_PREFIXES(DragWindowResizerTest, DragWindowController);
     44 
     45   // Creates DragWindowResizer that adds the ability of dragging windows across
     46   // displays to |next_window_resizer|. This object takes the ownership of
     47   // |next_window_resizer|.
     48   explicit DragWindowResizer(WindowResizer* next_window_resizer,
     49                              const Details& details);
     50 
     51   // Updates the bounds of the phantom window for window dragging. Set true on
     52   // |in_original_root| if the pointer is still in |window()->GetRootWindow()|.
     53   void UpdateDragWindow(const gfx::Rect& bounds, bool in_original_root);
     54 
     55   // Returns true if we should allow the mouse pointer to warp.
     56   bool ShouldAllowMouseWarp();
     57 
     58   // Get the user drop target underneath the given |point_in_screen| or NULL.
     59   TrayUser* GetTrayUserItemAtPoint(const gfx::Point& point_in_screen);
     60 
     61   // Check if a completed drag might cause the window to change active desktops.
     62   // If the call was causing a "transfer of ownership to another desktop" and it
     63   // will return false indicating that no further processing is needed.
     64   bool TryDraggingToNewUser();
     65 
     66   scoped_ptr<WindowResizer> next_window_resizer_;
     67 
     68   // Shows a semi-transparent image of the window being dragged.
     69   scoped_ptr<DragWindowController> drag_window_controller_;
     70 
     71   const Details details_;
     72 
     73   gfx::Point last_mouse_location_;
     74 
     75   // Current instance for use by the DragWindowResizerTest.
     76   static DragWindowResizer* instance_;
     77 
     78   base::WeakPtrFactory<DragWindowResizer> weak_ptr_factory_;
     79 
     80   DISALLOW_COPY_AND_ASSIGN(DragWindowResizer);
     81 };
     82 
     83 }  // namespace internal
     84 }  // namespace ash
     85 
     86 #endif  // ASH_WM_DRAG_WINDOW_RESIZER_H_
     87