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dobjcmn.cpp
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C/C++ Source or Header
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2002-08-16
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433 lines
///////////////////////////////////////////////////////////////////////////////
// Name: common/dobjcmn.cpp
// Purpose: implementation of data object methods common to all platforms
// Author: Vadim Zeitlin, Robert Roebling
// Modified by:
// Created: 19.10.99
// RCS-ID: $Id: dobjcmn.cpp,v 1.20 2002/08/15 20:47:04 RR Exp $
// Copyright: (c) wxWindows Team
// Licence: wxWindows license
///////////////////////////////////////////////////////////////////////////////
// ============================================================================
// declarations
// ============================================================================
// ----------------------------------------------------------------------------
// headers
// ----------------------------------------------------------------------------
#ifdef __GNUG__
#pragma implementation "dataobjbase.h"
#endif
#include "wx/wxprec.h"
#ifdef __BORLANDC__
#pragma hdrstop
#endif
#if wxUSE_DATAOBJ
#ifndef WX_PRECOMP
#include "wx/app.h"
#include "wx/debug.h"
#endif // WX_PRECOMP
#include "wx/dataobj.h"
// ----------------------------------------------------------------------------
// lists
// ----------------------------------------------------------------------------
#include "wx/listimpl.cpp"
WX_DEFINE_LIST(wxSimpleDataObjectList);
// ----------------------------------------------------------------------------
// globals
// ----------------------------------------------------------------------------
static wxDataFormat dataFormatInvalid;
WXDLLEXPORT const wxDataFormat& wxFormatInvalid = dataFormatInvalid;
// ============================================================================
// implementation
// ============================================================================
// ----------------------------------------------------------------------------
// wxDataObjectBase
// ----------------------------------------------------------------------------
wxDataObjectBase::~wxDataObjectBase()
{
}
bool wxDataObjectBase::IsSupported(const wxDataFormat& format,
Direction dir) const
{
size_t nFormatCount = GetFormatCount(dir);
if ( nFormatCount == 1 )
{
return format == GetPreferredFormat(dir);
}
else
{
wxDataFormat *formats = new wxDataFormat[nFormatCount];
GetAllFormats(formats, dir);
size_t n;
for ( n = 0; n < nFormatCount; n++ )
{
if ( formats[n] == format )
break;
}
delete [] formats;
// found?
return n < nFormatCount;
}
}
// ----------------------------------------------------------------------------
// wxDataObjectComposite
// ----------------------------------------------------------------------------
wxDataObjectComposite::wxDataObjectComposite()
{
m_preferred = 0;
m_dataObjects.DeleteContents(TRUE);
}
wxDataObjectSimple *
wxDataObjectComposite::GetObject(const wxDataFormat& format) const
{
wxSimpleDataObjectList::Node *node = m_dataObjects.GetFirst();
while ( node )
{
wxDataObjectSimple *dataObj = node->GetData();
if ( dataObj->GetFormat() == format )
{
return dataObj;
}
node = node->GetNext();
}
return (wxDataObjectSimple *)NULL;
}
void wxDataObjectComposite::Add(wxDataObjectSimple *dataObject, bool preferred)
{
if ( preferred )
m_preferred = m_dataObjects.GetCount();
m_dataObjects.Append( dataObject );
}
wxDataFormat
wxDataObjectComposite::GetPreferredFormat(Direction WXUNUSED(dir)) const
{
wxSimpleDataObjectList::Node *node = m_dataObjects.Item( m_preferred );
wxCHECK_MSG( node, wxFormatInvalid, wxT("no preferred format") );
wxDataObjectSimple* dataObj = node->GetData();
return dataObj->GetFormat();
}
#if defined(__WXMSW__)
size_t wxDataObjectComposite::GetBufferOffset( const wxDataFormat& format )
{
wxDataObjectSimple *dataObj = GetObject(format);
wxCHECK_MSG( dataObj, 0,
wxT("unsupported format in wxDataObjectComposite"));
return dataObj->GetBufferOffset( format );
}
const void* wxDataObjectComposite::GetSizeFromBuffer( const void* buffer,
size_t* size,
const wxDataFormat& format )
{
wxDataObjectSimple *dataObj = GetObject(format);
wxCHECK_MSG( dataObj, NULL,
wxT("unsupported format in wxDataObjectComposite"));
return dataObj->GetSizeFromBuffer( buffer, size, format );
}
void* wxDataObjectComposite::SetSizeInBuffer( void* buffer, size_t size,
const wxDataFormat& format )
{
wxDataObjectSimple *dataObj = GetObject(format);
wxCHECK_MSG( dataObj, NULL,
wxT("unsupported format in wxDataObjectComposite"));
return dataObj->SetSizeInBuffer( buffer, size, format );
}
#endif
size_t wxDataObjectComposite::GetFormatCount(Direction WXUNUSED(dir)) const
{
// TODO what about the Get/Set only formats?
return m_dataObjects.GetCount();
}
void wxDataObjectComposite::GetAllFormats(wxDataFormat *formats,
Direction WXUNUSED(dir)) const
{
size_t n = 0;
wxSimpleDataObjectList::Node *node;
for ( node = m_dataObjects.GetFirst(); node; node = node->GetNext() )
{
// TODO if ( !outputOnlyToo ) && this one counts ...
formats[n++] = node->GetData()->GetFormat();
}
}
size_t wxDataObjectComposite::GetDataSize(const wxDataFormat& format) const
{
wxDataObjectSimple *dataObj = GetObject(format);
wxCHECK_MSG( dataObj, 0,
wxT("unsupported format in wxDataObjectComposite"));
return dataObj->GetDataSize();
}
bool wxDataObjectComposite::GetDataHere(const wxDataFormat& format,
void *buf) const
{
wxDataObjectSimple *dataObj = GetObject(format);
wxCHECK_MSG( dataObj, FALSE,
wxT("unsupported format in wxDataObjectComposite"));
return dataObj->GetDataHere(buf);
}
bool wxDataObjectComposite::SetData(const wxDataFormat& format,
size_t len,
const void *buf)
{
wxDataObjectSimple *dataObj = GetObject(format);
wxCHECK_MSG( dataObj, FALSE,
wxT("unsupported format in wxDataObjectComposite"));
return dataObj->SetData(len, buf);
}
// ----------------------------------------------------------------------------
// wxTextDataObject
// ----------------------------------------------------------------------------
size_t wxTextDataObject::GetDataSize() const
{
#if defined(__WXGTK20__) && wxUSE_UNICODE
// Use UTF8 not UCS4
wxCharBuffer buffer = wxConvUTF8.cWX2MB( GetText().c_str() );
return strlen( (const char*) buffer ) + 1;
#else
return GetTextLength() * sizeof(wxChar);
#endif
}
bool wxTextDataObject::GetDataHere(void *buf) const
{
#if defined(__WXGTK20__) && wxUSE_UNICODE
// Use UTF8 not UCS4
wxCharBuffer buffer = wxConvUTF8.cWX2MB( GetText().c_str() );
strcpy( (char*) buf, (const char*) buffer );
#else
wxStrcpy((wxChar *)buf, GetText().c_str());
#endif
return TRUE;
}
bool wxTextDataObject::SetData(size_t WXUNUSED(len), const void *buf)
{
#if defined(__WXGTK20__) && wxUSE_UNICODE
// Use UTF8 not UCS4
SetText( wxConvUTF8.cMB2WX( (const char*) buf ) );
#else
SetText(wxString((const wxChar *)buf));
#endif
return TRUE;
}
// ----------------------------------------------------------------------------
// wxFileDataObjectBase
// ----------------------------------------------------------------------------
// VZ: I don't need this in MSW finally, so if it is needed in wxGTK, it should
// be moved to gtk/dataobj.cpp
#if 0
wxString wxFileDataObjectBase::GetFilenames() const
{
wxString str;
size_t count = m_filenames.GetCount();
for ( size_t n = 0; n < count; n++ )
{
str << m_filenames[n] << wxT('\0');
}
return str;
}
void wxFileDataObjectBase::SetFilenames(const wxChar* filenames)
{
m_filenames.Empty();
wxString current;
for ( const wxChar *pc = filenames; ; pc++ )
{
if ( *pc )
{
current += *pc;
}
else
{
if ( !current )
{
// 2 consecutive NULs - this is the end of the string
break;
}
m_filenames.Add(current);
current.Empty();
}
}
}
#endif // 0
// ----------------------------------------------------------------------------
// wxCustomDataObject
// ----------------------------------------------------------------------------
wxCustomDataObject::wxCustomDataObject(const wxDataFormat& format)
: wxDataObjectSimple(format)
{
m_data = (void *)NULL;
}
wxCustomDataObject::~wxCustomDataObject()
{
Free();
}
void wxCustomDataObject::TakeData(size_t size, void *data)
{
Free();
m_size = size;
m_data = data;
}
void *wxCustomDataObject::Alloc(size_t size)
{
return (void *)new char[size];
}
void wxCustomDataObject::Free()
{
delete [] (char *)m_data;
m_size = 0;
m_data = (void *)NULL;
}
size_t wxCustomDataObject::GetDataSize() const
{
return GetSize();
}
bool wxCustomDataObject::GetDataHere(void *buf) const
{
void *data = GetData();
if ( !data )
return FALSE;
memcpy(buf, data, GetSize());
return TRUE;
}
bool wxCustomDataObject::SetData(size_t size, const void *buf)
{
Free();
m_data = Alloc(size);
if ( !m_data )
return FALSE;
memcpy(m_data, buf, m_size = size);
return TRUE;
}
// ============================================================================
// some common dnd related code
// ============================================================================
#if wxUSE_DRAG_AND_DROP
#include "wx/dnd.h"
// ----------------------------------------------------------------------------
// wxTextDropTarget
// ----------------------------------------------------------------------------
// NB: we can't use "new" in ctor initializer lists because this provokes an
// internal compiler error with VC++ 5.0 (hey, even gcc compiles this!),
// so use SetDataObject() instead
wxTextDropTarget::wxTextDropTarget()
{
SetDataObject(new wxTextDataObject);
}
wxDragResult wxTextDropTarget::OnData(wxCoord x, wxCoord y, wxDragResult def)
{
if ( !GetData() )
return wxDragNone;
wxTextDataObject *dobj = (wxTextDataObject *)m_dataObject;
return OnDropText(x, y, dobj->GetText()) ? def : wxDragNone;
}
// ----------------------------------------------------------------------------
// wxFileDropTarget
// ----------------------------------------------------------------------------
wxFileDropTarget::wxFileDropTarget()
{
SetDataObject(new wxFileDataObject);
}
wxDragResult wxFileDropTarget::OnData(wxCoord x, wxCoord y, wxDragResult def)
{
if ( !GetData() )
return wxDragNone;
wxFileDataObject *dobj = (wxFileDataObject *)m_dataObject;
return OnDropFiles(x, y, dobj->GetFilenames()) ? def : wxDragNone;
}
#endif // wxUSE_DRAG_AND_DROP
#endif // wxUSE_DATAOBJ