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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 CONTENT_BROWSER_WEB_CONTENTS_WEB_DRAG_SOURCE_WIN_H_
#define CONTENT_BROWSER_WEB_CONTENTS_WEB_DRAG_SOURCE_WIN_H_
#include "base/basictypes.h"
#include "content/public/browser/notification_observer.h"
#include "content/public/browser/notification_registrar.h"
#include "ui/base/dragdrop/drag_source_win.h"
#include "ui/gfx/native_widget_types.h"
#include "ui/gfx/point.h"
namespace ui {
class OSExchangeData;
} // namespace ui
namespace content {
class RenderViewHost;
class WebContents;
class WebContentsImpl;
// An IDropSource implementation for a WebContentsImpl. Handles notifications
// sent by an active drag-drop operation as the user mouses over other drop
// targets on their system. This object tells Windows whether or not the drag
// should continue, and supplies the appropriate cursors.
class WebDragSource : public ui::DragSourceWin,
public NotificationObserver {
public:
// Create a new DragSource for a given HWND and WebContents.
WebDragSource(gfx::NativeWindow source_wnd, WebContents* web_contents);
virtual ~WebDragSource();
// NotificationObserver implementation.
virtual void Observe(int type,
const NotificationSource& source,
const NotificationDetails& details);
void set_effect(DWORD effect) { effect_ = effect; }
// Used to set the active data object for the current drag operation. The
// caller must ensure that |data| is not destroyed before the nested drag loop
// terminates.
void set_data(ui::OSExchangeData* data) { data_ = data; }
protected:
// ui::DragSourceWin
virtual void OnDragSourceCancel();
virtual void OnDragSourceDrop();
virtual void OnDragSourceMove();
private:
// Cannot construct thusly.
WebDragSource();
// OnDragSourceDrop schedules its main work to be done after IDropTarget::Drop
// by posting a task to this function.
void DelayedOnDragSourceDrop();
// Keep a reference to the window so we can translate the cursor position.
gfx::NativeWindow source_wnd_;
// We use this as a channel to the renderer to tell it about various drag
// drop events that it needs to know about (such as when a drag operation it
// initiated terminates).
WebContentsImpl* web_contents_;
NotificationRegistrar registrar_;
DWORD effect_;
ui::OSExchangeData* data_;
DISALLOW_COPY_AND_ASSIGN(WebDragSource);
};
} // namespace content
#endif // CONTENT_BROWSER_WEB_CONTENTS_WEB_DRAG_SOURCE_WIN_H_
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