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_DRAG_DROP_DRAG_IMAGE_VIEW_H_ 6 #define ASH_DRAG_DROP_DRAG_IMAGE_VIEW_H_ 7 8 #include "ui/base/dragdrop/drag_drop_types.h" 9 #include "ui/views/controls/image_view.h" 10 11 namespace views { 12 class Widget; 13 } 14 15 namespace ash { 16 namespace internal { 17 18 // This class allows to show a (native) view always on top of everything. It 19 // does this by creating a widget and setting the content as the given view. The 20 // caller can then use this object to freely move / drag it around on the 21 // desktop in screen coordinates. 22 class DragImageView : public views::ImageView { 23 public: 24 // |context is the native view context used to create the widget holding the 25 // drag image. 26 // |source| is the event source that started this drag drop operation (touch 27 // or mouse). It is used to determine attributes of the drag image such as 28 // whether to show drag operation hint on top of the image. 29 DragImageView(gfx::NativeView context, 30 ui::DragDropTypes::DragEventSource source); 31 virtual ~DragImageView(); 32 33 // Sets the bounds of the native widget in screen 34 // coordinates. 35 // TODO(oshima): Looks like this is root window's 36 // coordinate. Change this to screen's coordinate. 37 void SetBoundsInScreen(const gfx::Rect& bounds); 38 39 // Sets the position of the native widget. 40 void SetScreenPosition(const gfx::Point& position); 41 42 // Gets the image position in screen coordinates. 43 gfx::Rect GetBoundsInScreen() const; 44 45 // Sets the visibility of the native widget. 46 void SetWidgetVisible(bool visible); 47 48 // For touch drag drop, we show a hint corresponding to the drag operation 49 // (since no mouse cursor is visible). These functions set the hint 50 // parameters. 51 void SetTouchDragOperationHintOff(); 52 53 // |operation| is a bit field indicating allowable drag operations from 54 // ui::DragDropTypes::DragOperation. 55 void SetTouchDragOperation(int operation); 56 void SetTouchDragOperationHintPosition(const gfx::Point& position); 57 58 // Sets the |opacity| of the image view between 0.0 and 1.0. 59 void SetOpacity(float opacity); 60 61 private: 62 // Overridden from views::ImageView. 63 virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE; 64 65 scoped_ptr<views::Widget> widget_; 66 gfx::Size widget_size_; 67 68 ui::DragDropTypes::DragEventSource drag_event_source_; 69 int touch_drag_operation_; 70 gfx::Point touch_drag_operation_indicator_position_; 71 72 DISALLOW_COPY_AND_ASSIGN(DragImageView); 73 }; 74 75 } // namespace internal 76 } // namespace ash 77 78 #endif // ASH_DRAG_DROP_DRAG_IMAGE_VIEW_H_ 79