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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef ASH_DRAG_DROP_DRAG_IMAGE_VIEW_H_
#define ASH_DRAG_DROP_DRAG_IMAGE_VIEW_H_
#include "base/macros.h"
#include "ui/base/dragdrop/drag_drop_types.h"
#include "ui/views/controls/image_view.h"
namespace gfx {
class Image;
}
namespace views {
class Widget;
}
namespace ash {
// This class allows to show a (native) view always on top of everything. It
// does this by creating a widget and setting the content as the given view. The
// caller can then use this object to freely move / drag it around on the
// desktop in screen coordinates.
class DragImageView : public views::ImageView {
public:
// |context is the native view context used to create the widget holding the
// drag image.
// |source| is the event source that started this drag drop operation (touch
// or mouse). It is used to determine attributes of the drag image such as
// whether to show drag operation hint on top of the image.
DragImageView(gfx::NativeView context,
ui::DragDropTypes::DragEventSource source);
~DragImageView() override;
// Sets the bounds of the native widget in screen
// coordinates.
// TODO(oshima): Looks like this is root window's
// coordinate. Change this to screen's coordinate.
void SetBoundsInScreen(const gfx::Rect& bounds);
// Sets the position of the native widget.
void SetScreenPosition(const gfx::Point& position);
// Gets the image position in screen coordinates.
gfx::Rect GetBoundsInScreen() const;
// Sets the visibility of the native widget.
void SetWidgetVisible(bool visible);
// For touch drag drop, we show a hint corresponding to the drag operation
// (since no mouse cursor is visible). These functions set the hint
// parameters.
void SetTouchDragOperationHintOff();
// |operation| is a bit field indicating allowable drag operations from
// ui::DragDropTypes::DragOperation.
void SetTouchDragOperation(int operation);
void SetTouchDragOperationHintPosition(const gfx::Point& position);
// Sets the |opacity| of the image view between 0.0 and 1.0.
void SetOpacity(float opacity);
private:
gfx::Image* DragHint() const;
// Overridden from views::ImageView.
void OnPaint(gfx::Canvas* canvas) override;
// Overridden from views::view
void Layout() override;
scoped_ptr<views::Widget> widget_;
gfx::Size widget_size_;
ui::DragDropTypes::DragEventSource drag_event_source_;
int touch_drag_operation_;
gfx::Point touch_drag_operation_indicator_position_;
DISALLOW_COPY_AND_ASSIGN(DragImageView);
};
} // namespace ash
#endif // ASH_DRAG_DROP_DRAG_IMAGE_VIEW_H_
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