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 #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 static inline wxMBConv& GetConv(const wxDataFormat& format)
 243 {
 244     // use UTF8 for wxDF_UNICODETEXT and UCS4 for wxDF_TEXT
 245     return format == wxDF_UNICODETEXT ? wxConvUTF8 : wxConvLibc;
 246 }
 247
 248 size_t wxTextDataObject::GetDataSize(const wxDataFormat& format) const
 249 {
 250     wxCharBuffer buffer = GetConv(format).cWX2MB( GetText().c_str() );
 251     return buffer ? strlen(buffer) + 1 : 0;
 252 }
 253
 254 bool wxTextDataObject::GetDataHere(const wxDataFormat& format, void *buf) const
 255 {
 256     wxCharBuffer buffer = GetConv(format).cWX2MB( GetText().c_str() );
 257     if ( !buffer )
 258         return false;
 259
 260     strcpy( (char*) buf, buffer );
 261
 262     return true;
 263 }
 264
 265 bool wxTextDataObject::SetData(const wxDataFormat& format,
 266                                size_t WXUNUSED(len), const void *buf)
 267 {
 268     wxWCharBuffer buffer = GetConv(format).cMB2WX((const char *)buf);
 269     if ( !buffer )
 270         return false;
 271
 272     SetText(buffer);
 273
 274     return true;
 275 }
 276
 277 #elif wxUSE_UNICODE && defined(__WXMAC__)
 278
 279 static wxMBConvUTF16 sUTF16Converter ;
 280
 281 static inline wxMBConv& GetConv(const wxDataFormat& format)
 282 {
 283     return format == wxDF_UNICODETEXT ? sUTF16Converter : (wxMBConv&) wxConvLocal;
 284 }
 285
 286 size_t wxTextDataObject::GetDataSize(const wxDataFormat& format) const
 287 {
 288     size_t len = GetConv(format).WC2MB( NULL , GetText().c_str() , 0 )
 289         + ( format == wxDF_UNICODETEXT ? 2 : 1 ) ;
 290     return len ;
 291 }
 292
 293 bool wxTextDataObject::GetDataHere(const wxDataFormat& format, void *buf) const
 294 {
 295     wxCharBuffer buffer = GetConv(format).cWX2MB( GetText().c_str() );
 296     if ( !buffer )
 297         return false;
 298
 299     size_t len = GetConv(format).WC2MB( NULL , GetText().c_str() , 0 )
 300         + ( format == wxDF_UNICODETEXT ? 2 : 1 ) ;
 301
 302     memcpy( (char*) buf, (const char*) buffer , len ); // trailing (uni)char 0
 303
 304     return true;
 305 }
 306
 307 bool wxTextDataObject::SetData(const wxDataFormat& format,
 308                                size_t WXUNUSED(len), const void *buf)
 309 {
 310     wxWCharBuffer buffer = GetConv(format).cMB2WX((const char *)buf);
 311     if ( !buffer )
 312         return false;
 313
 314     SetText(buffer);
 315
 316     return true;
 317 }
 318
 319 #else
 320
 321 size_t wxTextDataObject::GetDataSize() const
 322 {
 323     return GetTextLength() * sizeof(wxChar);
 324 }
 325
 326 bool wxTextDataObject::GetDataHere(void *buf) const
 327 {
 328     wxStrcpy((wxChar *)buf, GetText().c_str());
 329
 330     return true;
 331 }
 332
 333 bool wxTextDataObject::SetData(size_t WXUNUSED(len), const void *buf)
 334 {
 335     SetText(wxString((const wxChar *)buf));
 336
 337     return true;
 338 }
 339
 340 #endif
 341
 342 // ----------------------------------------------------------------------------
 343 // wxFileDataObjectBase
 344 // ----------------------------------------------------------------------------
 345
 346 // VZ: I don't need this in MSW finally, so if it is needed in wxGTK, it should
 347 //     be moved to gtk/dataobj.cpp
 348 #if 0
 349
 350 wxString wxFileDataObjectBase::GetFilenames() const
 351 {
 352     wxString str;
 353     size_t count = m_filenames.GetCount();
 354     for ( size_t n = 0; n < count; n++ )
 355     {
 356         str << m_filenames[n] << wxT('\0');
 357     }
 358
 359     return str;
 360 }
 361
 362 void wxFileDataObjectBase::SetFilenames(const wxChar* filenames)
 363 {
 364     m_filenames.Empty();
 365
 366     wxString current;
 367     for ( const wxChar *pc = filenames; ; pc++ )
 368     {
 369         if ( *pc )
 370         {
 371             current += *pc;
 372         }
 373         else
 374         {
 375             if ( !current )
 376             {
 377                 // 2 consecutive NULs - this is the end of the string
 378                 break;
 379             }
 380
 381             m_filenames.Add(current);
 382             current.Empty();
 383         }
 384     }
 385 }
 386
 387 #endif // 0
 388
 389 // ----------------------------------------------------------------------------
 390 // wxCustomDataObject
 391 // ----------------------------------------------------------------------------
 392
 393 wxCustomDataObject::wxCustomDataObject(const wxDataFormat& format)
 394     : wxDataObjectSimple(format)
 395 {
 396     m_data = (void *)NULL;
 397 }
 398
 399 wxCustomDataObject::~wxCustomDataObject()
 400 {
 401     Free();
 402 }
 403
 404 void wxCustomDataObject::TakeData(size_t size, void *data)
 405 {
 406     Free();
 407
 408     m_size = size;
 409     m_data = data;
 410 }
 411
 412 void *wxCustomDataObject::Alloc(size_t size)
 413 {
 414     return (void *)new char[size];
 415 }
 416
 417 void wxCustomDataObject::Free()
 418 {
 419     delete [] (char *)m_data;
 420     m_size = 0;
 421     m_data = (void *)NULL;
 422 }
 423
 424 size_t wxCustomDataObject::GetDataSize() const
 425 {
 426     return GetSize();
 427 }
 428
 429 bool wxCustomDataObject::GetDataHere(void *buf) const
 430 {
 431     void *data = GetData();
 432     if ( !data )
 433         return false;
 434
 435     memcpy(buf, data, GetSize());
 436
 437     return true;
 438 }
 439
 440 bool wxCustomDataObject::SetData(size_t size, const void *buf)
 441 {
 442     Free();
 443
 444     m_data = Alloc(size);
 445     if ( !m_data )
 446         return false;
 447
 448     memcpy(m_data, buf, m_size = size);
 449
 450     return true;
 451 }
 452
 453 // ============================================================================
 454 // some common dnd related code
 455 // ============================================================================
 456
 457 #if wxUSE_DRAG_AND_DROP
 458
 459 #include "wx/dnd.h"
 460
 461 // ----------------------------------------------------------------------------
 462 // wxTextDropTarget
 463 // ----------------------------------------------------------------------------
 464
 465 // NB: we can't use "new" in ctor initializer lists because this provokes an
 466 //     internal compiler error with VC++ 5.0 (hey, even gcc compiles this!),
 467 //     so use SetDataObject() instead
 468
 469 wxTextDropTarget::wxTextDropTarget()
 470 {
 471     SetDataObject(new wxTextDataObject);
 472 }
 473
 474 wxDragResult wxTextDropTarget::OnData(wxCoord x, wxCoord y, wxDragResult def)
 475 {
 476     if ( !GetData() )
 477         return wxDragNone;
 478
 479     wxTextDataObject *dobj = (wxTextDataObject *)m_dataObject;
 480     return OnDropText(x, y, dobj->GetText()) ? def : wxDragNone;
 481 }
 482
 483 // ----------------------------------------------------------------------------
 484 // wxFileDropTarget
 485 // ----------------------------------------------------------------------------
 486
 487 wxFileDropTarget::wxFileDropTarget()
 488 {
 489     SetDataObject(new wxFileDataObject);
 490 }
 491
 492 wxDragResult wxFileDropTarget::OnData(wxCoord x, wxCoord y, wxDragResult def)
 493 {
 494     if ( !GetData() )
 495         return wxDragNone;
 496
 497     wxFileDataObject *dobj = (wxFileDataObject *)m_dataObject;
 498     return OnDropFiles(x, y, dobj->GetFilenames()) ? def : wxDragNone;
 499 }
 500
 501 #endif // wxUSE_DRAG_AND_DROP
 502
 503 #endif // wxUSE_DATAOBJ