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 } 22 23 namespace views { 24 class Widget; 25 } 26 27 namespace ash { 28 namespace internal { 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 children. This object is the owner of 88 // the layer. 89 ui::Layer* layer_; 90 91 DISALLOW_COPY_AND_ASSIGN(DragWindowController); 92 }; 93 94 } // namespace internal 95 } // namespace ash 96 97 #endif // ASH_WM_DRAG_WINDOW_CONTROLLER_H_ 98