dataobj2.h

很牛的GUI源码wxWidgets-2.8.0.zip 可在多种平台下运行.

///////////////////////////////////////////////////////////////////////////////
// Name:        wx/cocoa/dataobj2.h
// Purpose:     declaration of standard wxDataObjectSimple-derived classes
// Author:      David Elliott <[e-mail]>
// Modified by:
// Created:     2003/07/23
// RCS-ID:      $Id: dataobj2.h,v 1.4 2006/09/05 20:45:17 VZ Exp $
// Copyright:   (c) 2003 David Elliott
// Licence:     wxWindows licence
///////////////////////////////////////////////////////////////////////////////

#ifndef __WX_COCOA_DATAOBJ2_H__
#define __WX_COCOA_DATAOBJ2_H__

//=========================================================================
// wxBitmapDataObject is a specialization of wxDataObject for bitmaps
//=========================================================================
class wxBitmapDataObject : public wxBitmapDataObjectBase
{
public:
    // ctors
    wxBitmapDataObject();
    wxBitmapDataObject(const wxBitmap& bitmap);

    // destr
    virtual ~wxBitmapDataObject();

    // override base class virtual to update PNG data too
    virtual void SetBitmap(const wxBitmap& bitmap);

    // implement base class pure virtuals
    // ----------------------------------

    virtual size_t GetDataSize() const { return m_pngSize; }
    virtual bool GetDataHere(void *buf) const;
    virtual bool SetData(size_t len, const void *buf);

protected:
    void Init() { m_pngData = (void *)NULL; m_pngSize = 0; }
    void Clear() { free(m_pngData); }
    void ClearAll() { Clear(); Init(); }

    size_t      m_pngSize;
    void       *m_pngData;

    void DoConvertToPng();

private:
    // virtual function hiding supression
    size_t GetDataSize(const wxDataFormat& format) const
        { return(wxDataObjectSimple::GetDataSize(format)); }
    bool GetDataHere(const wxDataFormat& format, void* pBuf) const
        { return(wxDataObjectSimple::GetDataHere(format, pBuf)); }
    bool SetData(const wxDataFormat& format, size_t nLen, const void* pBuf)
        { return(wxDataObjectSimple::SetData(format, nLen, pBuf)); }
};

//=========================================================================
// wxFileDataObject is a specialization of wxDataObject for file names
//=========================================================================

class wxFileDataObject : public wxFileDataObjectBase
{
public:
    // implement base class pure virtuals
    // ----------------------------------

    void AddFile( const wxString &filename );

    virtual size_t GetDataSize() const;
    virtual bool GetDataHere(void *buf) const;
    virtual bool SetData(size_t len, const void *buf);

private:
    // virtual function hiding supression
    size_t GetDataSize(const wxDataFormat& format) const
        { return(wxDataObjectSimple::GetDataSize(format)); }
    bool GetDataHere(const wxDataFormat& format, void* pBuf) const
        { return(wxDataObjectSimple::GetDataHere(format, pBuf)); }
    bool SetData(const wxDataFormat& format, size_t nLen, const void* pBuf)
        { return(wxDataObjectSimple::SetData(format, nLen, pBuf)); }
};

#endif //__WX_COCOA_DATAOBJ2_H__