clipbrd.cpp

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

/////////////////////////////////////////////////////////////////////////////
// Name:        src/mac/carbon/clipbrd.cpp
// Purpose:     Clipboard functionality
// Author:      Stefan Csomor;
//              Generalized clipboard implementation by Matthew Flatt
// Modified by:
// Created:     1998-01-01
// RCS-ID:      $Id: clipbrd.cpp,v 1.50 2006/06/14 10:01:58 ABX Exp $
// Copyright:   (c) Stefan Csomor
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#include "wx/wxprec.h"

#if wxUSE_CLIPBOARD

#include "wx/clipbrd.h"

#ifndef WX_PRECOMP
    #include "wx/intl.h"
    #include "wx/log.h"
    #include "wx/app.h"
    #include "wx/utils.h"
    #include "wx/frame.h"
    #include "wx/bitmap.h"
#endif

#include "wx/metafile.h"

#ifndef __DARWIN__
#include <Scrap.h>
#endif

#include "wx/mac/uma.h"

#define wxUSE_DATAOBJ 1

#include <string.h>


// the trace mask we use with wxLogTrace() - call
// wxLog::AddTraceMask(TRACE_CLIPBOARD) to enable the trace messages from here
// (there will be a *lot* of them!)
static const wxChar *TRACE_CLIPBOARD = wxT("clipboard");


void * wxGetClipboardData( wxDataFormat dataFormat, long *len )
{
    OSStatus err = noErr;
    void * data = NULL;
    Size byteCount;

    switch (dataFormat.GetType())
    {
    case wxDF_OEMTEXT:
        dataFormat = wxDF_TEXT;
        break;

    case wxDF_TEXT:
    case wxDF_UNICODETEXT:
        break;

    case wxDF_BITMAP:
    case wxDF_METAFILE:
        break;

    default:
        // custom datatype
        break;
    }

#if TARGET_CARBON
    ScrapRef scrapRef;

    err = GetCurrentScrap( &scrapRef );
    if ( err != noTypeErr && err != memFullErr )
    {
        ScrapFlavorFlags    flavorFlags;

        err = GetScrapFlavorFlags( scrapRef, dataFormat.GetFormatId(), &flavorFlags );
        if (err == noErr)
        {
            err = GetScrapFlavorSize( scrapRef, dataFormat.GetFormatId(), &byteCount );
            if (err == noErr)
            {
                Size allocSize = byteCount;
                if ( dataFormat.GetType() == wxDF_TEXT )
                    allocSize += 1;
                else if ( dataFormat.GetType() == wxDF_UNICODETEXT )
                    allocSize += 2;

                data = new char[ allocSize ];

                if (( err = GetScrapFlavorData( scrapRef, dataFormat.GetFormatId(), &byteCount , data )) == noErr )
                {
                    *len = allocSize;
                    if ( dataFormat.GetType() == wxDF_TEXT )
                        ((char*)data)[ byteCount ] = 0;
                    if ( dataFormat.GetType() == wxDF_UNICODETEXT )
                    {
                        // "data" format is UTF16, so 2 bytes = one character
                        // wxChar size depends on platform, so just clear last 2 bytes
                        ((char*)data)[ byteCount + 0 ] =
                        ((char*)data)[ byteCount + 1 ] = 0;
                    }
                }
                else
                {
                    delete [] (char*)data;
                    data = NULL;
                }
            }
        }
    }

#else
    long offset;
    Handle datahandle = NewHandle( 0 );
    HLock( datahandle );
    err = (OSStatus)GetScrap( datahandle, dataFormat.GetFormatId(), &offset );
    HUnlock( datahandle );
    if ( GetHandleSize( datahandle ) > 0 )
    {
        byteCount = GetHandleSize( datahandle );
        Size allocSize = byteCount;
        if ( dataFormat.GetType() == wxDF_TEXT )
            allocSize += 1;
        else if ( dataFormat.GetType() == wxDF_UNICODETEXT )
            allocSize += 2;

        data = new char[ allocSize ];

        memcpy( (char*) data, (char*) *datahandle, byteCount );
        if ( dataFormat.GetType() == wxDF_TEXT )
            ((char*)data)[ byteCount ] = 0;
        else if ( dataFormat.GetType() == wxDF_UNICODETEXT )
            ((wxChar*)data)[ byteCount / 2 ] = 0;
        *len = byteCount;
    }

    DisposeHandle( datahandle );
#endif

    if (err != noErr)
    {
        wxLogSysError(wxT("Failed to get clipboard data."));

        return NULL;
    }

    if (dataFormat.GetType() == wxDF_TEXT)
        wxMacConvertNewlines10To13( (char*)data );

    return data;
}

IMPLEMENT_DYNAMIC_CLASS(wxClipboard, wxObject)

wxClipboard::wxClipboard()
{
    m_open = false;
    m_data = NULL;
}

wxClipboard::~wxClipboard()
{
    if (m_data != NULL)
    {
        delete m_data;
        m_data = NULL;
    }
}

void wxClipboard::Clear()
{
    if (m_data != NULL)
    {
        delete m_data;
        m_data = NULL;
    }

#if TARGET_CARBON
    OSStatus err;
    err = ClearCurrentScrap();
#else
    OSErr err;
    err = ZeroScrap();
#endif

    if (err != noErr)
    {
        wxLogSysError( wxT("Failed to empty the clipboard.") );
    }
}

bool wxClipboard::Flush()
{
    return false;
}

bool wxClipboard::Open()
{
    wxCHECK_MSG( !m_open, false, wxT("clipboard already open") );

    m_open = true;

    return true;
}

bool wxClipboard::IsOpened() const
{
    return m_open;
}

bool wxClipboard::SetData( wxDataObject *data )
{
    wxCHECK_MSG( m_open, false, wxT("clipboard not open") );
    wxCHECK_MSG( data, false, wxT("data is invalid") );

    Clear();

    // as we can only store one wxDataObject,
    // this is the same in this implementation
    return AddData( data );
}

bool wxClipboard::AddData( wxDataObject *data )
{
    wxCHECK_MSG( m_open, false, wxT("clipboard not open") );
    wxCHECK_MSG( data, false, wxT("data is invalid") );

    // we can only store one wxDataObject
    Clear();

    m_data = data;

    // get formats from wxDataObjects
    wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
    m_data->GetAllFormats( array );

    for (size_t i = 0; i < m_data->GetFormatCount(); i++)
    {
        if (array[i].IsStandard())
        {
            wxLogTrace( TRACE_CLIPBOARD,
                        wxT("wxClipboard now supports standard atom type %d"),
                        array[i].GetType() );
        }
        else
        {
            wxLogTrace( TRACE_CLIPBOARD,
                        wxT("wxClipboard now supports atom %s"),
                        array[i].GetId().c_str() );
        }

        size_t sz = data->GetDataSize( array[ i ] );
        void* buf = malloc( sz + 1 );
        if ( buf != NULL )
        {
            // empty the buffer because in some case GetDataHere does not fill buf
            memset( buf, 0, sz + 1 );
            data->GetDataHere( array[ i ], buf );
            OSType mactype = 0;
            switch ( array[i].GetType() )
            {
            case wxDF_TEXT:
            case wxDF_OEMTEXT:
                mactype = kScrapFlavorTypeText;
                sz -= 1;
                break;

#if wxUSE_UNICODE
            case wxDF_UNICODETEXT:
                mactype = kScrapFlavorTypeUnicode;
                sz -= 2;
                break;
#endif

#if wxUSE_DRAG_AND_DROP
            case wxDF_METAFILE:
                mactype = kScrapFlavorTypePicture;
                break;
#endif

            case wxDF_BITMAP:
            case wxDF_DIB:
                mactype = kScrapFlavorTypePicture;
                break;

            default:
                mactype = (OSType)(array[ i ].GetFormatId());
                break;
            }

            UMAPutScrap( sz , mactype , buf );
            free( buf );
        }
    }

    delete [] array;

    return true;
}

void wxClipboard::Close()
{
    wxCHECK_RET( m_open, wxT("clipboard not open") );

    m_open = false;

    // Get rid of cached object.
    // If this is not done, copying data from
    // another application will only work once
    if (m_data)
    {
        delete m_data;
        m_data = (wxDataObject*) NULL;
    }
}

bool wxClipboard::IsSupported( const wxDataFormat &dataFormat )
{
    if ( m_data )
        return m_data->IsSupported( dataFormat );

    bool hasData = false;

#if TARGET_CARBON
    OSStatus err = noErr;
    ScrapRef scrapRef;

    err = GetCurrentScrap( &scrapRef );
    if ( err != noTypeErr && err != memFullErr )
    {
        ScrapFlavorFlags flavorFlags;
        Size byteCount;

        err = GetScrapFlavorFlags( scrapRef, dataFormat.GetFormatId(), &flavorFlags );
        if (err == noErr)
        {
            err = GetScrapFlavorSize( scrapRef, dataFormat.GetFormatId(), &byteCount );
            if (err == noErr)
                hasData = true;
        }
        else if ( dataFormat.GetType() == wxDF_UNICODETEXT )
        {
            err = GetScrapFlavorFlags( scrapRef, 'TEXT', &flavorFlags );
            if (err == noErr)
            {
                err = GetScrapFlavorSize( scrapRef, 'TEXT', &byteCount );
                if (err == noErr)
                    hasData = true;
            }
        }
    }

#else

    long offset = 0;
    Handle datahandle = NewHandle( 0 );
    HLock( datahandle );
    GetScrap( datahandle, dataFormat.GetFormatId(), &offset );
    HUnlock( datahandle );
    hasData = GetHandleSize( datahandle ) > 0;
    DisposeHandle( datahandle );
#endif

    return hasData;
}

bool wxClipboard::GetData( wxDataObject& data )
{
    wxCHECK_MSG( m_open, false, wxT("clipboard not open") );

    size_t formatcount = data.GetFormatCount() + 1;
    wxDataFormat *array = new wxDataFormat[ formatcount ];
    array[0] = data.GetPreferredFormat();
    data.GetAllFormats( &array[1] );

    bool transferred = false;

    if ( m_data )
    {
        for (size_t i = 0; !transferred && i < formatcount; i++)
        {
            wxDataFormat format = array[ i ];
            if ( m_data->IsSupported( format ) )
            {
                int dataSize = m_data->GetDataSize( format );
                transferred = true;

                if (dataSize == 0)
                {
                    data.SetData( format, 0, 0 );
                }
                else
                {
                    char *d = new char[ dataSize ];
                    m_data->GetDataHere( format, (void*)d );
                    data.SetData( format, dataSize, d );
                    delete [] d;
                }
            }
        }
    }

    // get formats from wxDataObjects
    if ( !transferred )
    {
        for (size_t i = 0; !transferred && i < formatcount; i++)
        {
            wxDataFormat format = array[ i ];

            switch ( format.GetType() )
            {
                // NOTE: this is usable for all data types
                case wxDF_TEXT:
                case wxDF_UNICODETEXT:
                case wxDF_OEMTEXT:
                case wxDF_BITMAP:
                case wxDF_METAFILE:
                default:
                {
                    long len;
                    char* s = (char*)wxGetClipboardData( format, &len );
                    if (s != NULL)
                    {
                        data.SetData( format, len, s );
                        delete [] s;

                        transferred = true;
                    }
                }
                break;
            }
        }
    }

    delete [] array;

    return transferred;
}

#endif