droptarget.h

FreeAMP(MP3播放)程序源代码-用来研究MP3解码

/*____________________________________________________________________________

        FreeAmp - The Free MP3 Player

        Portions Copyright (C) 1999 EMusic.com

        This program is free software; you can redistribute it and/or modify
        it under the terms of the GNU General Public License as published by
        the Free Software Foundation; either version 2 of the License, or
        (at your option) any later version.

        This program 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, write to the Free Software
        Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

        $Id: DropTarget.h,v 1.7 2000/09/16 11:47:48 elrod Exp $
____________________________________________________________________________*/

#ifndef INCLUDED_DROPTARGET_H_
#define INCLUDED_DROPTARGET_H_

#include <ole2.h>

#define UWM_DROPURLS    WM_USER + 42 
#define UWM_MOVEITEMS   WM_USER + 43

class FAR DropTarget : public IDropTarget
{
 public:    
    DropTarget(HWND hwnd);
	~DropTarget ();
    void Enable(bool bEnable);
    void TargetIsSource(bool isSrc);
    void ScrollFunction();

    /* IUnknown methods */
    STDMETHOD(QueryInterface)(REFIID riid, void FAR* FAR* ppvObj);
    STDMETHOD_(ULONG, AddRef)(void);
    STDMETHOD_(ULONG, Release)(void);

    /* IDropTarget methods */
    STDMETHOD(DragEnter)(LPDATAOBJECT pDataObj, DWORD dwKeyState, 
                         POINTL pt, LPDWORD pdwEffect);
    STDMETHOD(DragOver)(DWORD dwKeyState, POINTL pt, LPDWORD pdwEffect);
    STDMETHOD(DragLeave)();
    STDMETHOD(Drop)(LPDATAOBJECT pDataObj, DWORD dwKeyState, 
                    POINTL pt, LPDWORD pdwEffect); 
 
    
 private:
    void CheckAutoScroll(POINT pt);
    void AutoScroll(int scrollCode);

    ULONG           m_refs;  
	HWND            m_hwnd;
    bool            m_acceptFormat;
	bool            m_enabled;
    bool            m_allowMove;
    bool            m_targetIsSource;
    HBRUSH          m_insertBrush;
    int             m_oldItem; 
    RECT            m_insertRect;
	RECT            m_scrollRect;
    bool            m_scrolling;
    int             m_scrollCode;
    int             m_timer;
};  

#endif // INCLUDED_DROPTARGET_H_