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) wxWidgets Team
   9 // Licence:     wxWindows licence
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 #include "wx/wxprec.h"
  21
  22 #ifdef __BORLANDC__
  23     #pragma hdrstop
  24 #endif
  25
  26 #if wxUSE_DATAOBJ
  27
  28 #ifndef WX_PRECOMP
  29     #include "wx/app.h"
  30     #include "wx/debug.h"
  31 #endif // WX_PRECOMP
  32
  33 #include "wx/dataobj.h"
  34
  35 // ----------------------------------------------------------------------------
  36 // lists
  37 // ----------------------------------------------------------------------------
  38
  39 #include "wx/listimpl.cpp"
  40
  41 WX_DEFINE_LIST(wxSimpleDataObjectList);
  42
  43 // ----------------------------------------------------------------------------
  44 // globals
  45 // ----------------------------------------------------------------------------
  46
  47 static wxDataFormat dataFormatInvalid;
  48 WXDLLEXPORT const wxDataFormat& wxFormatInvalid = dataFormatInvalid;
  49
  50 // ============================================================================
  51 // implementation
  52 // ============================================================================
  53
  54 // ----------------------------------------------------------------------------
  55 // wxDataObjectBase
  56 // ----------------------------------------------------------------------------
  57
  58 wxDataObjectBase::~wxDataObjectBase()
  59 {
  60 }
  61
  62 bool wxDataObjectBase::IsSupported(const wxDataFormat& format,
  63                                    Direction dir) const
  64 {
  65     size_t nFormatCount = GetFormatCount(dir);
  66     if ( nFormatCount == 1 )
  67     {
  68         return format == GetPreferredFormat(dir);
  69     }
  70     else
  71     {
  72         wxDataFormat *formats = new wxDataFormat[nFormatCount];
  73         GetAllFormats(formats, dir);
  74
  75         size_t n;
  76         for ( n = 0; n < nFormatCount; n++ )
  77         {
  78             if ( formats[n] == format )
  79                 break;
  80         }
  81
  82         delete [] formats;
  83
  84         // found?
  85         return n < nFormatCount;
  86     }
  87 }
  88
  89 // ----------------------------------------------------------------------------
  90 // wxDataObjectComposite
  91 // ----------------------------------------------------------------------------
  92
  93 wxDataObjectComposite::wxDataObjectComposite()
  94 {
  95     m_preferred = 0;
  96 }
  97
  98 wxDataObjectComposite::~wxDataObjectComposite()
  99 {
 100     WX_CLEAR_LIST(wxSimpleDataObjectList, m_dataObjects);
 101 }
 102
 103 wxDataObjectSimple *
 104 wxDataObjectComposite::GetObject(const wxDataFormat& format) const
 105 {
 106     wxSimpleDataObjectList::compatibility_iterator node = m_dataObjects.GetFirst();
 107     while ( node )
 108     {
 109         wxDataObjectSimple *dataObj = node->GetData();
 110
 111         if ( dataObj->GetFormat() == format )
 112         {
 113             return dataObj;
 114         }
 115
 116         node = node->GetNext();
 117     }
 118
 119     return (wxDataObjectSimple *)NULL;
 120 }
 121
 122 void wxDataObjectComposite::Add(wxDataObjectSimple *dataObject, bool preferred)
 123 {
 124     if ( preferred )
 125         m_preferred = m_dataObjects.GetCount();
 126
 127     m_dataObjects.Append( dataObject );
 128 }
 129
 130 wxDataFormat
 131 wxDataObjectComposite::GetPreferredFormat(Direction WXUNUSED(dir)) const
 132 {
 133     wxSimpleDataObjectList::compatibility_iterator node = m_dataObjects.Item( m_preferred );
 134
 135     wxCHECK_MSG( node, wxFormatInvalid, wxT("no preferred format") );
 136
 137     wxDataObjectSimple* dataObj = node->GetData();
 138
 139     return dataObj->GetFormat();
 140 }
 141
 142 #if defined(__WXMSW__)
 143
 144 size_t wxDataObjectComposite::GetBufferOffset( const wxDataFormat& format )
 145 {
 146     wxDataObjectSimple *dataObj = GetObject(format);
 147
 148     wxCHECK_MSG( dataObj, 0,
 149                  wxT("unsupported format in wxDataObjectComposite"));
 150
 151     return dataObj->GetBufferOffset( format );
 152 }
 153
 154
 155 const void* wxDataObjectComposite::GetSizeFromBuffer( const void* buffer,
 156                                                       size_t* size,
 157                                                       const wxDataFormat& format )
 158 {
 159     wxDataObjectSimple *dataObj = GetObject(format);
 160
 161     wxCHECK_MSG( dataObj, NULL,
 162                  wxT("unsupported format in wxDataObjectComposite"));
 163
 164     return dataObj->GetSizeFromBuffer( buffer, size, format );
 165 }
 166
 167
 168 void* wxDataObjectComposite::SetSizeInBuffer( void* buffer, size_t size,
 169                                               const wxDataFormat& format )
 170 {
 171     wxDataObjectSimple *dataObj = GetObject(format);
 172
 173     wxCHECK_MSG( dataObj, NULL,
 174                  wxT("unsupported format in wxDataObjectComposite"));
 175
 176     return dataObj->SetSizeInBuffer( buffer, size, format );
 177 }
 178
 179 #endif
 180
 181 size_t wxDataObjectComposite::GetFormatCount(Direction WXUNUSED(dir)) const
 182 {
 183     // TODO what about the Get/Set only formats?
 184     return m_dataObjects.GetCount();
 185 }
 186
 187 void wxDataObjectComposite::GetAllFormats(wxDataFormat *formats,
 188                                           Direction WXUNUSED(dir)) const
 189 {
 190     size_t n = 0;
 191     wxSimpleDataObjectList::compatibility_iterator node;
 192     for ( node = m_dataObjects.GetFirst(); node; node = node->GetNext() )
 193     {
 194         // TODO if ( !outputOnlyToo ) && this one counts ...
 195         formats[n++] = node->GetData()->GetFormat();
 196     }
 197 }
 198
 199 size_t wxDataObjectComposite::GetDataSize(const wxDataFormat& format) const
 200 {
 201     wxDataObjectSimple *dataObj = GetObject(format);
 202
 203     wxCHECK_MSG( dataObj, 0,
 204                  wxT("unsupported format in wxDataObjectComposite"));
 205
 206     return dataObj->GetDataSize();
 207 }
 208
 209 bool wxDataObjectComposite::GetDataHere(const wxDataFormat& format,
 210                                         void *buf) const
 211 {
 212     wxDataObjectSimple *dataObj = GetObject(format);
 213
 214     wxCHECK_MSG( dataObj, false,
 215                  wxT("unsupported format in wxDataObjectComposite"));
 216
 217     return dataObj->GetDataHere(buf);
 218 }
 219
 220 bool wxDataObjectComposite::SetData(const wxDataFormat& format,
 221                                     size_t len,
 222                                     const void *buf)
 223 {
 224     wxDataObjectSimple *dataObj = GetObject(format);
 225
 226     wxCHECK_MSG( dataObj, false,
 227                  wxT("unsupported format in wxDataObjectComposite"));
 228
 229     return dataObj->SetData(len, buf);
 230 }
 231
 232 // ----------------------------------------------------------------------------
 233 // wxTextDataObject
 234 // ----------------------------------------------------------------------------
 235
 236 #if defined(__WXGTK20__) && wxUSE_UNICODE
 237
 238 static inline wxMBConv& GetConv(const wxDataFormat& format)
 239 {
 240     // use UTF8 for wxDF_UNICODETEXT and UCS4 for wxDF_TEXT
 241     return format == wxDF_UNICODETEXT ? wxConvUTF8 : wxConvLibc;
 242 }
 243
 244 size_t wxTextDataObject::GetDataSize(const wxDataFormat& format) const
 245 {
 246     wxCharBuffer buffer = GetConv(format).cWX2MB( GetText().c_str() );
 247     return buffer ? strlen(buffer) + 1 : 0;
 248 }
 249
 250 bool wxTextDataObject::GetDataHere(const wxDataFormat& format, void *buf) const
 251 {
 252     wxCharBuffer buffer = GetConv(format).cWX2MB( GetText().c_str() );
 253     if ( !buffer )
 254         return false;
 255
 256     strcpy( (char*) buf, buffer );
 257
 258     return true;
 259 }
 260
 261 bool wxTextDataObject::SetData(const wxDataFormat& format,
 262                                size_t WXUNUSED(len), const void *buf)
 263 {
 264     wxWCharBuffer buffer = GetConv(format).cMB2WX((const char *)buf);
 265     if ( !buffer )
 266         return false;
 267
 268     SetText(buffer);
 269
 270     return true;
 271 }
 272
 273 #elif wxUSE_UNICODE && defined(__WXMAC__)
 274
 275 static wxMBConvUTF16 sUTF16Converter ;
 276
 277 static inline wxMBConv& GetConv(const wxDataFormat& format)
 278 {
 279     return format == wxDF_UNICODETEXT ? sUTF16Converter : (wxMBConv&) wxConvLocal;
 280 }
 281
 282 size_t wxTextDataObject::GetDataSize(const wxDataFormat& format) const
 283 {
 284     size_t len = GetConv(format).WC2MB( NULL , GetText().c_str() , 0 )
 285         + ( format == wxDF_UNICODETEXT ? 2 : 1 ) ;
 286     return len ;
 287 }
 288
 289 bool wxTextDataObject::GetDataHere(const wxDataFormat& format, void *buf) const
 290 {
 291     wxCharBuffer buffer = GetConv(format).cWX2MB( GetText().c_str() );
 292     if ( !buffer )
 293         return false;
 294
 295     size_t len = GetConv(format).WC2MB( NULL , GetText().c_str() , 0 )
 296         + ( format == wxDF_UNICODETEXT ? 2 : 1 ) ;
 297
 298     memcpy( (char*) buf, (const char*) buffer , len ); // trailing (uni)char 0
 299
 300     return true;
 301 }
 302
 303 bool wxTextDataObject::SetData(const wxDataFormat& format,
 304                                size_t WXUNUSED(len), const void *buf)
 305 {
 306     wxWCharBuffer buffer = GetConv(format).cMB2WX((const char *)buf);
 307     if ( !buffer )
 308         return false;
 309
 310     SetText(buffer);
 311
 312     return true;
 313 }
 314
 315 #else
 316
 317 size_t wxTextDataObject::GetDataSize() const
 318 {
 319     return GetTextLength() * sizeof(wxChar);
 320 }
 321
 322 bool wxTextDataObject::GetDataHere(void *buf) const
 323 {
 324     wxStrcpy((wxChar *)buf, GetText().c_str());
 325
 326     return true;
 327 }
 328
 329 bool wxTextDataObject::SetData(size_t WXUNUSED(len), const void *buf)
 330 {
 331     SetText(wxString((const wxChar *)buf));
 332
 333     return true;
 334 }
 335
 336 #endif
 337
 338 // ----------------------------------------------------------------------------
 339 // wxFileDataObjectBase
 340 // ----------------------------------------------------------------------------
 341
 342 // VZ: I don't need this in MSW finally, so if it is needed in wxGTK, it should
 343 //     be moved to gtk/dataobj.cpp
 344 #if 0
 345
 346 wxString wxFileDataObjectBase::GetFilenames() const
 347 {
 348     wxString str;
 349     size_t count = m_filenames.GetCount();
 350     for ( size_t n = 0; n < count; n++ )
 351     {
 352         str << m_filenames[n] << wxT('\0');
 353     }
 354
 355     return str;
 356 }
 357
 358 void wxFileDataObjectBase::SetFilenames(const wxChar* filenames)
 359 {
 360     m_filenames.Empty();
 361
 362     wxString current;
 363     for ( const wxChar *pc = filenames; ; pc++ )
 364     {
 365         if ( *pc )
 366         {
 367             current += *pc;
 368         }
 369         else
 370         {
 371             if ( !current )
 372             {
 373                 // 2 consecutive NULs - this is the end of the string
 374                 break;
 375             }
 376
 377             m_filenames.Add(current);
 378             current.Empty();
 379         }
 380     }
 381 }
 382
 383 #endif // 0
 384
 385 // ----------------------------------------------------------------------------
 386 // wxCustomDataObject
 387 // ----------------------------------------------------------------------------
 388
 389 wxCustomDataObject::wxCustomDataObject(const wxDataFormat& format)
 390     : wxDataObjectSimple(format)
 391 {
 392     m_data = (void *)NULL;
 393 }
 394
 395 wxCustomDataObject::~wxCustomDataObject()
 396 {
 397     Free();
 398 }
 399
 400 void wxCustomDataObject::TakeData(size_t size, void *data)
 401 {
 402     Free();
 403
 404     m_size = size;
 405     m_data = data;
 406 }
 407
 408 void *wxCustomDataObject::Alloc(size_t size)
 409 {
 410     return (void *)new char[size];
 411 }
 412
 413 void wxCustomDataObject::Free()
 414 {
 415     delete [] (char *)m_data;
 416     m_size = 0;
 417     m_data = (void *)NULL;
 418 }
 419
 420 size_t wxCustomDataObject::GetDataSize() const
 421 {
 422     return GetSize();
 423 }
 424
 425 bool wxCustomDataObject::GetDataHere(void *buf) const
 426 {
 427     void *data = GetData();
 428     if ( !data )
 429         return false;
 430
 431     memcpy(buf, data, GetSize());
 432
 433     return true;
 434 }
 435
 436 bool wxCustomDataObject::SetData(size_t size, const void *buf)
 437 {
 438     Free();
 439
 440     m_data = Alloc(size);
 441     if ( !m_data )
 442         return false;
 443
 444     memcpy(m_data, buf, m_size = size);
 445
 446     return true;
 447 }
 448
 449 // ============================================================================
 450 // some common dnd related code
 451 // ============================================================================
 452
 453 #if wxUSE_DRAG_AND_DROP
 454
 455 #include "wx/dnd.h"
 456
 457 // ----------------------------------------------------------------------------
 458 // wxTextDropTarget
 459 // ----------------------------------------------------------------------------
 460
 461 // NB: we can't use "new" in ctor initializer lists because this provokes an
 462 //     internal compiler error with VC++ 5.0 (hey, even gcc compiles this!),
 463 //     so use SetDataObject() instead
 464
 465 wxTextDropTarget::wxTextDropTarget()
 466 {
 467     SetDataObject(new wxTextDataObject);
 468 }
 469
 470 wxDragResult wxTextDropTarget::OnData(wxCoord x, wxCoord y, wxDragResult def)
 471 {
 472     if ( !GetData() )
 473         return wxDragNone;
 474
 475     wxTextDataObject *dobj = (wxTextDataObject *)m_dataObject;
 476     return OnDropText(x, y, dobj->GetText()) ? def : wxDragNone;
 477 }
 478
 479 // ----------------------------------------------------------------------------
 480 // wxFileDropTarget
 481 // ----------------------------------------------------------------------------
 482
 483 wxFileDropTarget::wxFileDropTarget()
 484 {
 485     SetDataObject(new wxFileDataObject);
 486 }
 487
 488 wxDragResult wxFileDropTarget::OnData(wxCoord x, wxCoord y, wxDragResult def)
 489 {
 490     if ( !GetData() )
 491         return wxDragNone;
 492
 493     wxFileDataObject *dobj = (wxFileDataObject *)m_dataObject;
 494     return OnDropFiles(x, y, dobj->GetFilenames()) ? def : wxDragNone;
 495 }
 496
 497 #endif // wxUSE_DRAG_AND_DROP
 498
 499 #endif // wxUSE_DATAOBJ