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.
5 #ifndef ASH_DRAG_DROP_DRAG_IMAGE_VIEW_H_
6 #define ASH_DRAG_DROP_DRAG_IMAGE_VIEW_H_
8 #include "ui/base/dragdrop/drag_drop_types.h"
9 #include "ui/views/controls/image_view.h"
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 {
24 // |context is the native view context used to create the widget holding the
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();
33 // Sets the bounds of the native widget in screen
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);
39 // Sets the position of the native widget.
40 void SetScreenPosition(const gfx::Point& position);
42 // Gets the image position in screen coordinates.
43 gfx::Rect GetBoundsInScreen() const;
45 // Sets the visibility of the native widget.
46 void SetWidgetVisible(bool visible);
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
51 void SetTouchDragOperationHintOff();
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);
58 // Sets the |opacity| of the image view between 0.0 and 1.0.
59 void SetOpacity(float opacity);
62 // Overridden from views::ImageView.
63 virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
65 scoped_ptr<views::Widget> widget_;
66 gfx::Size widget_size_;
68 ui::DragDropTypes::DragEventSource drag_event_source_;
69 int touch_drag_operation_;
70 gfx::Point touch_drag_operation_indicator_position_;
72 DISALLOW_COPY_AND_ASSIGN(DragImageView);
75 } // namespace internal
78 #endif // ASH_DRAG_DROP_DRAG_IMAGE_VIEW_H_