src/common/dobjcmn.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        common/dobjcmn.cpp
   3 // Purpose:     implementation of data object methods common to all platforms
   4 // Author:      Vadim Zeitlin, Robert Roebling
   5 // Modified by:
   6 // Created:     19.10.99
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) wxWindows Team
   9 // Licence:     wxWindows licence
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  21     #pragma implementation "dataobjbase.h"
  22 #endif
  23
  24 #include "wx/wxprec.h"
  25
  26 #ifdef __BORLANDC__
  27     #pragma hdrstop
  28 #endif
  29
  30 #if wxUSE_DATAOBJ
  31
  32 #ifndef WX_PRECOMP
  33     #include "wx/app.h"
  34     #include "wx/debug.h"
  35 #endif // WX_PRECOMP
  36
  37 #include "wx/dataobj.h"
  38
  39 // ----------------------------------------------------------------------------
  40 // lists
  41 // ----------------------------------------------------------------------------
  42
  43 #include "wx/listimpl.cpp"
  44
  45 WX_DEFINE_LIST(wxSimpleDataObjectList);
  46
  47 // ----------------------------------------------------------------------------
  48 // globals
  49 // ----------------------------------------------------------------------------
  50
  51 static wxDataFormat dataFormatInvalid;
  52 WXDLLEXPORT const wxDataFormat& wxFormatInvalid = dataFormatInvalid;
  53
  54 // ============================================================================
  55 // implementation
  56 // ============================================================================
  57
  58 // ----------------------------------------------------------------------------
  59 // wxDataObjectBase
  60 // ----------------------------------------------------------------------------
  61
  62 wxDataObjectBase::~wxDataObjectBase()
  63 {
  64 }
  65
  66 bool wxDataObjectBase::IsSupported(const wxDataFormat& format,
  67                                    Direction dir) const
  68 {
  69     size_t nFormatCount = GetFormatCount(dir);
  70     if ( nFormatCount == 1 )
  71     {
  72         return format == GetPreferredFormat(dir);
  73     }
  74     else
  75     {
  76         wxDataFormat *formats = new wxDataFormat[nFormatCount];
  77         GetAllFormats(formats, dir);
  78
  79         size_t n;
  80         for ( n = 0; n < nFormatCount; n++ )
  81         {
  82             if ( formats[n] == format )
  83                 break;
  84         }
  85
  86         delete [] formats;
  87
  88         // found?
  89         return n < nFormatCount;
  90     }
  91 }
  92
  93 // ----------------------------------------------------------------------------
  94 // wxDataObjectComposite
  95 // ----------------------------------------------------------------------------
  96
  97 wxDataObjectComposite::wxDataObjectComposite()
  98 {
  99     m_preferred = 0;
 100 }
 101
 102 wxDataObjectComposite::~wxDataObjectComposite()
 103 {
 104     WX_CLEAR_LIST(wxSimpleDataObjectList, m_dataObjects);
 105 }
 106
 107 wxDataObjectSimple *
 108 wxDataObjectComposite::GetObject(const wxDataFormat& format) const
 109 {
 110     wxSimpleDataObjectList::compatibility_iterator node = m_dataObjects.GetFirst();
 111     while ( node )
 112     {
 113         wxDataObjectSimple *dataObj = node->GetData();
 114
 115         if ( dataObj->GetFormat() == format )
 116         {
 117             return dataObj;
 118         }
 119
 120         node = node->GetNext();
 121     }
 122
 123     return (wxDataObjectSimple *)NULL;
 124 }
 125
 126 void wxDataObjectComposite::Add(wxDataObjectSimple *dataObject, bool preferred)
 127 {
 128     if ( preferred )
 129         m_preferred = m_dataObjects.GetCount();
 130
 131     m_dataObjects.Append( dataObject );
 132 }
 133
 134 wxDataFormat
 135 wxDataObjectComposite::GetPreferredFormat(Direction WXUNUSED(dir)) const
 136 {
 137     wxSimpleDataObjectList::compatibility_iterator node = m_dataObjects.Item( m_preferred );
 138
 139     wxCHECK_MSG( node, wxFormatInvalid, wxT("no preferred format") );
 140
 141     wxDataObjectSimple* dataObj = node->GetData();
 142
 143     return dataObj->GetFormat();
 144 }
 145
 146 #if defined(__WXMSW__)
 147
 148 size_t wxDataObjectComposite::GetBufferOffset( const wxDataFormat& format )
 149 {
 150     wxDataObjectSimple *dataObj = GetObject(format);
 151
 152     wxCHECK_MSG( dataObj, 0,
 153                  wxT("unsupported format in wxDataObjectComposite"));
 154
 155     return dataObj->GetBufferOffset( format );
 156 }
 157
 158
 159 const void* wxDataObjectComposite::GetSizeFromBuffer( const void* buffer,
 160                                                       size_t* size,
 161                                                       const wxDataFormat& format )
 162 {
 163     wxDataObjectSimple *dataObj = GetObject(format);
 164
 165     wxCHECK_MSG( dataObj, NULL,
 166                  wxT("unsupported format in wxDataObjectComposite"));
 167
 168     return dataObj->GetSizeFromBuffer( buffer, size, format );
 169 }
 170
 171
 172 void* wxDataObjectComposite::SetSizeInBuffer( void* buffer, size_t size,
 173                                               const wxDataFormat& format )
 174 {
 175     wxDataObjectSimple *dataObj = GetObject(format);
 176
 177     wxCHECK_MSG( dataObj, NULL,
 178                  wxT("unsupported format in wxDataObjectComposite"));
 179
 180     return dataObj->SetSizeInBuffer( buffer, size, format );
 181 }
 182
 183 #endif
 184
 185 size_t wxDataObjectComposite::GetFormatCount(Direction WXUNUSED(dir)) const
 186 {
 187     // TODO what about the Get/Set only formats?
 188     return m_dataObjects.GetCount();
 189 }
 190
 191 void wxDataObjectComposite::GetAllFormats(wxDataFormat *formats,
 192                                           Direction WXUNUSED(dir)) const
 193 {
 194     size_t n = 0;
 195     wxSimpleDataObjectList::compatibility_iterator node;
 196     for ( node = m_dataObjects.GetFirst(); node; node = node->GetNext() )
 197     {
 198         // TODO if ( !outputOnlyToo ) && this one counts ...
 199         formats[n++] = node->GetData()->GetFormat();
 200     }
 201 }
 202
 203 size_t wxDataObjectComposite::GetDataSize(const wxDataFormat& format) const
 204 {
 205     wxDataObjectSimple *dataObj = GetObject(format);
 206
 207     wxCHECK_MSG( dataObj, 0,
 208                  wxT("unsupported format in wxDataObjectComposite"));
 209
 210     return dataObj->GetDataSize();
 211 }
 212
 213 bool wxDataObjectComposite::GetDataHere(const wxDataFormat& format,
 214                                         void *buf) const
 215 {
 216     wxDataObjectSimple *dataObj = GetObject(format);
 217
 218     wxCHECK_MSG( dataObj, FALSE,
 219                  wxT("unsupported format in wxDataObjectComposite"));
 220
 221     return dataObj->GetDataHere(buf);
 222 }
 223
 224 bool wxDataObjectComposite::SetData(const wxDataFormat& format,
 225                                     size_t len,
 226                                     const void *buf)
 227 {
 228     wxDataObjectSimple *dataObj = GetObject(format);
 229
 230     wxCHECK_MSG( dataObj, FALSE,
 231                  wxT("unsupported format in wxDataObjectComposite"));
 232
 233     return dataObj->SetData(len, buf);
 234 }
 235
 236 // ----------------------------------------------------------------------------
 237 // wxTextDataObject
 238 // ----------------------------------------------------------------------------
 239
 240 #if defined(__WXGTK20__) && wxUSE_UNICODE
 241
 242 size_t wxTextDataObject::GetDataSize(const wxDataFormat& format) const
 243 {
 244     if (format == wxDF_UNICODETEXT)
 245     {
 246         // Use UTF8 not UCS4
 247         wxCharBuffer buffer = wxConvUTF8.cWX2MB( GetText().c_str() );
 248         return strlen( (const char*) buffer ) + 1;
 249     }
 250     else  // == wxDF_TEXT
 251     {
 252         wxCharBuffer buffer = wxConvLibc.cWX2MB( GetText().c_str() );
 253         return strlen( (const char*) buffer ) + 1;
 254     }
 255 }
 256
 257 bool wxTextDataObject::GetDataHere(const wxDataFormat& format, void *buf) const
 258 {
 259     if (format == wxDF_UNICODETEXT)
 260     {
 261         // Use UTF8 not UCS4
 262         wxCharBuffer buffer = wxConvUTF8.cWX2MB( GetText().c_str() );
 263         strcpy( (char*) buf, (const char*) buffer );
 264     }
 265     else
 266     {
 267         wxCharBuffer buffer = wxConvLibc.cWX2MB( GetText().c_str() );
 268         strcpy( (char*) buf, (const char*) buffer );
 269     }
 270
 271     return TRUE;
 272 }
 273
 274 bool wxTextDataObject::SetData(const wxDataFormat& format,
 275                                size_t WXUNUSED(len), const void *buf)
 276 {
 277     if (format == wxDF_UNICODETEXT)
 278         SetText( wxConvUTF8.cMB2WX( (const char*) buf ) );
 279     else
 280         SetText( wxConvLibc.cMB2WX( (const char*) buf ) );
 281
 282     return TRUE;
 283 }
 284
 285 #else
 286
 287 size_t wxTextDataObject::GetDataSize() const
 288 {
 289     return GetTextLength() * sizeof(wxChar);
 290 }
 291
 292 bool wxTextDataObject::GetDataHere(void *buf) const
 293 {
 294     wxStrcpy((wxChar *)buf, GetText().c_str());
 295
 296     return TRUE;
 297 }
 298
 299 bool wxTextDataObject::SetData(size_t WXUNUSED(len), const void *buf)
 300 {
 301     SetText(wxString((const wxChar *)buf));
 302
 303     return TRUE;
 304 }
 305
 306 #endif
 307
 308 // ----------------------------------------------------------------------------
 309 // wxFileDataObjectBase
 310 // ----------------------------------------------------------------------------
 311
 312 // VZ: I don't need this in MSW finally, so if it is needed in wxGTK, it should
 313 //     be moved to gtk/dataobj.cpp
 314 #if 0
 315
 316 wxString wxFileDataObjectBase::GetFilenames() const
 317 {
 318     wxString str;
 319     size_t count = m_filenames.GetCount();
 320     for ( size_t n = 0; n < count; n++ )
 321     {
 322         str << m_filenames[n] << wxT('\0');
 323     }
 324
 325     return str;
 326 }
 327
 328 void wxFileDataObjectBase::SetFilenames(const wxChar* filenames)
 329 {
 330     m_filenames.Empty();
 331
 332     wxString current;
 333     for ( const wxChar *pc = filenames; ; pc++ )
 334     {
 335         if ( *pc )
 336         {
 337             current += *pc;
 338         }
 339         else
 340         {
 341             if ( !current )
 342             {
 343                 // 2 consecutive NULs - this is the end of the string
 344                 break;
 345             }
 346
 347             m_filenames.Add(current);
 348             current.Empty();
 349         }
 350     }
 351 }
 352
 353 #endif // 0
 354
 355 // ----------------------------------------------------------------------------
 356 // wxCustomDataObject
 357 // ----------------------------------------------------------------------------
 358
 359 wxCustomDataObject::wxCustomDataObject(const wxDataFormat& format)
 360     : wxDataObjectSimple(format)
 361 {
 362     m_data = (void *)NULL;
 363 }
 364
 365 wxCustomDataObject::~wxCustomDataObject()
 366 {
 367     Free();
 368 }
 369
 370 void wxCustomDataObject::TakeData(size_t size, void *data)
 371 {
 372     Free();
 373
 374     m_size = size;
 375     m_data = data;
 376 }
 377
 378 void *wxCustomDataObject::Alloc(size_t size)
 379 {
 380     return (void *)new char[size];
 381 }
 382
 383 void wxCustomDataObject::Free()
 384 {
 385     delete [] (char *)m_data;
 386     m_size = 0;
 387     m_data = (void *)NULL;
 388 }
 389
 390 size_t wxCustomDataObject::GetDataSize() const
 391 {
 392     return GetSize();
 393 }
 394
 395 bool wxCustomDataObject::GetDataHere(void *buf) const
 396 {
 397     void *data = GetData();
 398     if ( !data )
 399         return FALSE;
 400
 401     memcpy(buf, data, GetSize());
 402
 403     return TRUE;
 404 }
 405
 406 bool wxCustomDataObject::SetData(size_t size, const void *buf)
 407 {
 408     Free();
 409
 410     m_data = Alloc(size);
 411     if ( !m_data )
 412         return FALSE;
 413
 414     memcpy(m_data, buf, m_size = size);
 415
 416     return TRUE;
 417 }
 418
 419 // ============================================================================
 420 // some common dnd related code
 421 // ============================================================================
 422
 423 #if wxUSE_DRAG_AND_DROP
 424
 425 #include "wx/dnd.h"
 426
 427 // ----------------------------------------------------------------------------
 428 // wxTextDropTarget
 429 // ----------------------------------------------------------------------------
 430
 431 // NB: we can't use "new" in ctor initializer lists because this provokes an
 432 //     internal compiler error with VC++ 5.0 (hey, even gcc compiles this!),
 433 //     so use SetDataObject() instead
 434
 435 wxTextDropTarget::wxTextDropTarget()
 436 {
 437     SetDataObject(new wxTextDataObject);
 438 }
 439
 440 wxDragResult wxTextDropTarget::OnData(wxCoord x, wxCoord y, wxDragResult def)
 441 {
 442     if ( !GetData() )
 443         return wxDragNone;
 444
 445     wxTextDataObject *dobj = (wxTextDataObject *)m_dataObject;
 446     return OnDropText(x, y, dobj->GetText()) ? def : wxDragNone;
 447 }
 448
 449 // ----------------------------------------------------------------------------
 450 // wxFileDropTarget
 451 // ----------------------------------------------------------------------------
 452
 453 wxFileDropTarget::wxFileDropTarget()
 454 {
 455     SetDataObject(new wxFileDataObject);
 456 }
 457
 458 wxDragResult wxFileDropTarget::OnData(wxCoord x, wxCoord y, wxDragResult def)
 459 {
 460     if ( !GetData() )
 461         return wxDragNone;
 462
 463     wxFileDataObject *dobj = (wxFileDataObject *)m_dataObject;
 464     return OnDropFiles(x, y, dobj->GetFilenames()) ? def : wxDragNone;
 465 }
 466
 467 #endif // wxUSE_DRAG_AND_DROP
 468
 469 #endif // wxUSE_DATAOBJ