barrier/src/lib/platform/MSWindowsDropTarget.h

/*
 * synergy -- mouse and keyboard sharing utility
 * Copyright (C) 2014 Synergy Si Ltd.
 * 
 * This package is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * found in the file LICENSE that should have accompanied this file.
 * 
 * This package is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#pragma once

#include <string>
#define WIN32_LEAN_AND_MEAN
#include <Windows.h>
#include <oleidl.h>

class MSWindowsScreen;

class MSWindowsDropTarget : public IDropTarget {
public:
	MSWindowsDropTarget();
	~MSWindowsDropTarget();

	// IUnknown implementation
	HRESULT __stdcall	QueryInterface(REFIID iid, void** object);
	ULONG __stdcall		AddRef(void);
	ULONG __stdcall		Release(void);

	// IDropTarget implementation
	HRESULT __stdcall	DragEnter(IDataObject* dataObject, DWORD keyState, POINTL point, DWORD* effect);
	HRESULT __stdcall	DragOver(DWORD keyState, POINTL point, DWORD* effect);
	HRESULT __stdcall	DragLeave(void);
	HRESULT __stdcall	Drop(IDataObject* dataObject, DWORD keyState, POINTL point, DWORD* effect);

	void				setDraggingFilename(char* const);
	std::string			getDraggingFilename();
	void				clearDraggingFilename();

	static MSWindowsDropTarget& 
						instance();

private:
	bool				queryDataObject(IDataObject* dataObject);

	long				m_refCount;
	bool				m_allowDrop;
	std::string			m_dragFilename;
	
	static MSWindowsDropTarget*
						s_instance;
};