chromeos: Move files in //ash/common to //ash, part 2

ash/common/drag_drop/drag_image_view.h

-// 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_COMMON_DRAG_DROP_DRAG_IMAGE_VIEW_H_
-#define ASH_COMMON_DRAG_DROP_DRAG_IMAGE_VIEW_H_
-
-#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 gfx {
-class Image;
-}
-
-namespace views {
-class Widget;
-}
-
-namespace ash {
-
-class WmWindow;
-
-// 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 {
- public:
-  // |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(WmWindow* 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;
-
- private:
-  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_;
-
-  DISALLOW_COPY_AND_ASSIGN(DragImageView);
-};
-
-}  // namespace ash
-
-#endif  // ASH_COMMON_DRAG_DROP_DRAG_IMAGE_VIEW_H_