blob: c7012d8c99aa1d123d284a2eb5f918aa1598d0af [file] [log] [blame]
// Copyright (c) 2011 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 VIEWS_EVENTS_DRAG_CONTROLLER_H_
#define VIEWS_EVENTS_DRAG_CONTROLLER_H_
#pragma once
namespace gfx {
class Point;
}
namespace ui {
class OSExchangeData;
}
namespace views {
class View;
// DragController is responsible for writing drag data for a view, as well as
// supplying the supported drag operations. Use DragController if you don't
// want to subclass.
class DragController {
public:
// Writes the data for the drag.
virtual void WriteDragDataForView(View* sender,
const gfx::Point& press_pt,
OSExchangeData* data) = 0;
// Returns the supported drag operations (see DragDropTypes for possible
// values). A drag is only started if this returns a non-zero value.
virtual int GetDragOperationsForView(View* sender,
const gfx::Point& p) = 0;
// Returns true if a drag operation can be started.
// |press_pt| represents the coordinates where the mouse was initially
// pressed down. |p| is the current mouse coordinates.
virtual bool CanStartDragForView(View* sender,
const gfx::Point& press_pt,
const gfx::Point& p) = 0;
protected:
virtual ~DragController() {}
};
} // namespace views
#endif // VIEWS_EVENTS_DRAG_CONTROLLER_H_