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