ash/wm/drag_window_controller.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_CONTROLLER_H_
   6 #define ASH_WM_DRAG_WINDOW_CONTROLLER_H_
   7
   8 #include "ash/ash_export.h"
   9 #include "base/basictypes.h"
  10 #include "base/gtest_prod_util.h"
  11 #include "base/memory/scoped_ptr.h"
  12 #include "ui/gfx/display.h"
  13 #include "ui/gfx/rect.h"
  14
  15 namespace aura {
  16 class Window;
  17 }
  18
  19 namespace ui {
  20 class Layer;
  21 class LayerTreeOwner;
  22 }
  23
  24 namespace views {
  25 class Widget;
  26 }
  27
  28 namespace ash {
  29
  30 // DragWindowController is responsible for showing a semi-transparent window
  31 // while dragging a window across displays.
  32 class ASH_EXPORT DragWindowController {
  33  public:
  34   explicit DragWindowController(aura::Window* window);
  35   virtual ~DragWindowController();
  36
  37   // Sets the display where the window is placed after the window is dropped.
  38   void SetDestinationDisplay(const gfx::Display& dst_display);
  39
  40   // Shows the drag window at the specified location (coordinates of the
  41   // parent). If |layer| is non-NULL, it is shown on top of the drag window.
  42   // |layer| is owned by the caller.
  43   // This does not immediately show the window.
  44   void Show();
  45
  46   // Hides the drag window.
  47   void Hide();
  48
  49   // This is used to set bounds for the drag window immediately. This should
  50   // be called only when the drag window is already visible.
  51   void SetBounds(const gfx::Rect& bounds);
  52
  53   // Sets the opacity of the drag window.
  54   void SetOpacity(float opacity);
  55
  56  private:
  57   FRIEND_TEST_ALL_PREFIXES(DragWindowResizerTest, DragWindowController);
  58
  59   // Creates and shows the |drag_widget_| at |bounds|.
  60   // |layer| is shown on top of the drag window if it is non-NULL.
  61   // |layer| is not owned by this object.
  62   void CreateDragWidget(const gfx::Rect& bounds);
  63
  64   // Sets bounds of the drag window. The window is shown on |dst_display_|
  65   // if its id() is valid. Otherwise, a display nearest to |bounds| is chosen.
  66   void SetBoundsInternal(const gfx::Rect& bounds);
  67
  68   // Recreates a fresh layer for |window_| and all its child windows.
  69   void RecreateWindowLayers();
  70
  71   // Window the drag window is placed beneath.
  72   aura::Window* window_;
  73
  74   // The display where the drag is placed. When dst_display_.id() is
  75   // kInvalidDisplayID (i.e. the default), a display nearest to the current
  76   // |bounds_| is automatically used.
  77   gfx::Display dst_display_;
  78
  79   // Initially the bounds of |window_|. Each time Show() is invoked
  80   // |start_bounds_| is then reset to the bounds of |drag_widget_| and
  81   // |bounds_| is set to the value passed into Show(). The animation animates
  82   // between these two values.
  83   gfx::Rect bounds_;
  84
  85   views::Widget* drag_widget_;
  86
  87   // The copy of window_->layer() and its descendants.
  88   scoped_ptr<ui::LayerTreeOwner> layer_owner_;
  89
  90   DISALLOW_COPY_AND_ASSIGN(DragWindowController);
  91 };
  92
  93 }  // namespace ash
  94
  95 #endif  // ASH_WM_DRAG_WINDOW_CONTROLLER_H_