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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.
#include <memory>
#include "ash/ash_export.h"
#include "base/macros.h"
#include "ui/base/dragdrop/drag_drop_types.h"
#include "ui/gfx/geometry/point.h"
#include "ui/gfx/geometry/size.h"
#include "ui/views/controls/image_view.h"
namespace aura {
class Window;
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 ASH_EXPORT DragImageView : public views::ImageView {
// |root_window| is the root window on which to create the drag image widget.
// |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(aura::Window* root_window,
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);
gfx::Size GetMinimumSize() const override;
gfx::Image* DragHint() const;
// Drag hint images are only drawn when the input source is touch.
bool ShouldDrawDragHint() const;
// Overridden from views::ImageView.
void OnPaint(gfx::Canvas* canvas) override;
// Overridden from views::view
void Layout() override;
std::unique_ptr<views::Widget> widget_;
// Save the requested drag image size. We may need to display a drag hint
// image, which potentially expands |widget_|'s size. That drag hint image
// may be disabled (e.g. during the drag cancel animation). In that case,
// we need to know the originally requested size to render the drag image.
gfx::Size drag_image_size_;
ui::DragDropTypes::DragEventSource drag_event_source_;
// Bitmask of ui::DragDropTypes::DragOperation values.
int touch_drag_operation_;
gfx::Point touch_drag_operation_indicator_position_;
} // namespace ash