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 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                                    wm::WindowState* window_state);
  31
  32   // WindowResizer:
  33   virtual void Drag(const gfx::Point& location, int event_flags) OVERRIDE;
  34   virtual void CompleteDrag() OVERRIDE;
  35   virtual void RevertDrag() OVERRIDE;
  36
  37  private:
  38   FRIEND_TEST_ALL_PREFIXES(DragWindowResizerTest, DragWindowController);
  39
  40   // Creates DragWindowResizer that adds the ability of dragging windows across
  41   // displays to |next_window_resizer|. This object takes the ownership of
  42   // |next_window_resizer|.
  43   explicit DragWindowResizer(WindowResizer* next_window_resizer,
  44                              wm::WindowState* window_state);
  45
  46   // Updates the bounds of the phantom window for window dragging. Set true on
  47   // |in_original_root| if the pointer is still in |window()->GetRootWindow()|.
  48   void UpdateDragWindow(const gfx::Rect& bounds, bool in_original_root);
  49
  50   // Returns true if we should allow the mouse pointer to warp.
  51   bool ShouldAllowMouseWarp();
  52
  53   // Get the user drop target underneath the given |point_in_screen| or NULL.
  54   TrayUser* GetTrayUserItemAtPoint(const gfx::Point& point_in_screen);
  55
  56   // Check if a completed drag might cause the window to change active desktops.
  57   // If the call was causing a "transfer of ownership to another desktop" and it
  58   // will return false indicating that no further processing is needed.
  59   bool TryDraggingToNewUser();
  60
  61   scoped_ptr<WindowResizer> next_window_resizer_;
  62
  63   // Shows a semi-transparent image of the window being dragged.
  64   scoped_ptr<DragWindowController> drag_window_controller_;
  65
  66   gfx::Point last_mouse_location_;
  67
  68   // Current instance for use by the DragWindowResizerTest.
  69   static DragWindowResizer* instance_;
  70
  71   base::WeakPtrFactory<DragWindowResizer> weak_ptr_factory_;
  72
  73   DISALLOW_COPY_AND_ASSIGN(DragWindowResizer);
  74 };
  75
  76 }  // namespace internal
  77 }  // namespace ash
  78
  79 #endif  // ASH_WM_DRAG_WINDOW_RESIZER_H_