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 license
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 #ifdef __GNUG__
  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     m_dataObjects.DeleteContents(TRUE);
 102 }
 103
 104 wxDataObjectSimple *
 105 wxDataObjectComposite::GetObject(const wxDataFormat& format) const
 106 {
 107     wxSimpleDataObjectList::Node *node = m_dataObjects.GetFirst();
 108     while ( node )
 109     {
 110         wxDataObjectSimple *dataObj = node->GetData();
 111
 112         if ( dataObj->GetFormat() == format )
 113         {
 114             return dataObj;
 115         }
 116
 117         node = node->GetNext();
 118     }
 119
 120     return (wxDataObjectSimple *)NULL;
 121 }
 122
 123 void wxDataObjectComposite::Add(wxDataObjectSimple *dataObject, bool preferred)
 124 {
 125     if ( preferred )
 126         m_preferred = m_dataObjects.GetCount();
 127
 128     m_dataObjects.Append( dataObject );
 129 }
 130
 131 wxDataFormat
 132 wxDataObjectComposite::GetPreferredFormat(Direction WXUNUSED(dir)) const
 133 {
 134     wxSimpleDataObjectList::Node *node = m_dataObjects.Item( m_preferred );
 135
 136     wxCHECK_MSG( node, wxFormatInvalid, wxT("no preferred format") );
 137
 138     wxDataObjectSimple* dataObj = node->GetData();
 139
 140     return dataObj->GetFormat();
 141 }
 142
 143 #if defined(__WXMSW__)
 144
 145 size_t wxDataObjectComposite::GetBufferOffset( const wxDataFormat& format )
 146 {
 147     wxDataObjectSimple *dataObj = GetObject(format);
 148
 149     wxCHECK_MSG( dataObj, 0,
 150                  wxT("unsupported format in wxDataObjectComposite"));
 151
 152     return dataObj->GetBufferOffset( format );
 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 void* wxDataObjectComposite::SetSizeInBuffer( void* buffer, size_t size,
 168                                               const wxDataFormat& format )
 169 {
 170     wxDataObjectSimple *dataObj = GetObject(format);
 171
 172     wxCHECK_MSG( dataObj, NULL,
 173                  wxT("unsupported format in wxDataObjectComposite"));
 174
 175     return dataObj->SetSizeInBuffer( buffer, size, format );
 176 }
 177
 178 #endif
 179
 180 size_t wxDataObjectComposite::GetFormatCount(Direction WXUNUSED(dir)) const
 181 {
 182     // TODO what about the Get/Set only formats?
 183     return m_dataObjects.GetCount();
 184 }
 185
 186 void wxDataObjectComposite::GetAllFormats(wxDataFormat *formats,
 187                                           Direction WXUNUSED(dir)) const
 188 {
 189     size_t n = 0;
 190     wxSimpleDataObjectList::Node *node;
 191     for ( node = m_dataObjects.GetFirst(); node; node = node->GetNext() )
 192     {
 193         // TODO if ( !outputOnlyToo ) && this one counts ...
 194         formats[n++] = node->GetData()->GetFormat();
 195     }
 196 }
 197
 198 size_t wxDataObjectComposite::GetDataSize(const wxDataFormat& format) const
 199 {
 200     wxDataObjectSimple *dataObj = GetObject(format);
 201
 202     wxCHECK_MSG( dataObj, 0,
 203                  wxT("unsupported format in wxDataObjectComposite"));
 204
 205     return dataObj->GetDataSize();
 206 }
 207
 208 bool wxDataObjectComposite::GetDataHere(const wxDataFormat& format,
 209                                         void *buf) const
 210 {
 211     wxDataObjectSimple *dataObj = GetObject(format);
 212
 213     wxCHECK_MSG( dataObj, FALSE,
 214                  wxT("unsupported format in wxDataObjectComposite"));
 215
 216     return dataObj->GetDataHere(buf);
 217 }
 218
 219 bool wxDataObjectComposite::SetData(const wxDataFormat& format,
 220                                     size_t len,
 221                                     const void *buf)
 222 {
 223     wxDataObjectSimple *dataObj = GetObject(format);
 224
 225     wxCHECK_MSG( dataObj, FALSE,
 226                  wxT("unsupported format in wxDataObjectComposite"));
 227
 228     return dataObj->SetData(len, buf);
 229 }
 230
 231 // ----------------------------------------------------------------------------
 232 // wxTextDataObject
 233 // ----------------------------------------------------------------------------
 234
 235 size_t wxTextDataObject::GetDataSize() const
 236 {
 237 #if defined(__WXGTK20__) && wxUSE_UNICODE
 238     // Use UTF8 not UCS4
 239     wxCharBuffer buffer = wxConvUTF8.cWX2MB( GetText().c_str() );
 240     return strlen( (const char*) buffer ) + 1;
 241 #else
 242     return GetTextLength() * sizeof(wxChar);
 243 #endif
 244 }
 245
 246 bool wxTextDataObject::GetDataHere(void *buf) const
 247 {
 248 #if defined(__WXGTK20__) && wxUSE_UNICODE
 249     // Use UTF8 not UCS4
 250     wxCharBuffer buffer = wxConvUTF8.cWX2MB( GetText().c_str() );
 251     strcpy( (char*) buf, (const char*) buffer );
 252 #else
 253     wxStrcpy((wxChar *)buf, GetText().c_str());
 254 #endif
 255
 256     return TRUE;
 257 }
 258
 259 bool wxTextDataObject::SetData(size_t WXUNUSED(len), const void *buf)
 260 {
 261 #if defined(__WXGTK20__) && wxUSE_UNICODE
 262     // Use UTF8 not UCS4
 263     SetText( wxConvUTF8.cMB2WX( (const char*) buf ) );
 264 #else
 265     SetText(wxString((const wxChar *)buf));
 266 #endif
 267
 268     return TRUE;
 269 }
 270
 271 // ----------------------------------------------------------------------------
 272 // wxFileDataObjectBase
 273 // ----------------------------------------------------------------------------
 274
 275 // VZ: I don't need this in MSW finally, so if it is needed in wxGTK, it should
 276 //     be moved to gtk/dataobj.cpp
 277 #if 0
 278
 279 wxString wxFileDataObjectBase::GetFilenames() const
 280 {
 281     wxString str;
 282     size_t count = m_filenames.GetCount();
 283     for ( size_t n = 0; n < count; n++ )
 284     {
 285         str << m_filenames[n] << wxT('\0');
 286     }
 287
 288     return str;
 289 }
 290
 291 void wxFileDataObjectBase::SetFilenames(const wxChar* filenames)
 292 {
 293     m_filenames.Empty();
 294
 295     wxString current;
 296     for ( const wxChar *pc = filenames; ; pc++ )
 297     {
 298         if ( *pc )
 299         {
 300             current += *pc;
 301         }
 302         else
 303         {
 304             if ( !current )
 305             {
 306                 // 2 consecutive NULs - this is the end of the string
 307                 break;
 308             }
 309
 310             m_filenames.Add(current);
 311             current.Empty();
 312         }
 313     }
 314 }
 315
 316 #endif // 0
 317
 318 // ----------------------------------------------------------------------------
 319 // wxCustomDataObject
 320 // ----------------------------------------------------------------------------
 321
 322 wxCustomDataObject::wxCustomDataObject(const wxDataFormat& format)
 323     : wxDataObjectSimple(format)
 324 {
 325     m_data = (void *)NULL;
 326 }
 327
 328 wxCustomDataObject::~wxCustomDataObject()
 329 {
 330     Free();
 331 }
 332
 333 void wxCustomDataObject::TakeData(size_t size, void *data)
 334 {
 335     Free();
 336
 337     m_size = size;
 338     m_data = data;
 339 }
 340
 341 void *wxCustomDataObject::Alloc(size_t size)
 342 {
 343     return (void *)new char[size];
 344 }
 345
 346 void wxCustomDataObject::Free()
 347 {
 348     delete [] (char *)m_data;
 349     m_size = 0;
 350     m_data = (void *)NULL;
 351 }
 352
 353 size_t wxCustomDataObject::GetDataSize() const
 354 {
 355     return GetSize();
 356 }
 357
 358 bool wxCustomDataObject::GetDataHere(void *buf) const
 359 {
 360     void *data = GetData();
 361     if ( !data )
 362         return FALSE;
 363
 364     memcpy(buf, data, GetSize());
 365
 366     return TRUE;
 367 }
 368
 369 bool wxCustomDataObject::SetData(size_t size, const void *buf)
 370 {
 371     Free();
 372
 373     m_data = Alloc(size);
 374     if ( !m_data )
 375         return FALSE;
 376
 377     memcpy(m_data, buf, m_size = size);
 378
 379     return TRUE;
 380 }
 381
 382 // ============================================================================
 383 // some common dnd related code
 384 // ============================================================================
 385
 386 #if wxUSE_DRAG_AND_DROP
 387
 388 #include "wx/dnd.h"
 389
 390 // ----------------------------------------------------------------------------
 391 // wxTextDropTarget
 392 // ----------------------------------------------------------------------------
 393
 394 // NB: we can't use "new" in ctor initializer lists because this provokes an
 395 //     internal compiler error with VC++ 5.0 (hey, even gcc compiles this!),
 396 //     so use SetDataObject() instead
 397
 398 wxTextDropTarget::wxTextDropTarget()
 399 {
 400     SetDataObject(new wxTextDataObject);
 401 }
 402
 403 wxDragResult wxTextDropTarget::OnData(wxCoord x, wxCoord y, wxDragResult def)
 404 {
 405     if ( !GetData() )
 406         return wxDragNone;
 407
 408     wxTextDataObject *dobj = (wxTextDataObject *)m_dataObject;
 409     return OnDropText(x, y, dobj->GetText()) ? def : wxDragNone;
 410 }
 411
 412 // ----------------------------------------------------------------------------
 413 // wxFileDropTarget
 414 // ----------------------------------------------------------------------------
 415
 416 wxFileDropTarget::wxFileDropTarget()
 417 {
 418     SetDataObject(new wxFileDataObject);
 419 }
 420
 421 wxDragResult wxFileDropTarget::OnData(wxCoord x, wxCoord y, wxDragResult def)
 422 {
 423     if ( !GetData() )
 424         return wxDragNone;
 425
 426     wxFileDataObject *dobj = (wxFileDataObject *)m_dataObject;
 427     return OnDropFiles(x, y, dobj->GetFilenames()) ? def : wxDragNone;
 428 }
 429
 430 #endif // wxUSE_DRAG_AND_DROP
 431
 432 #endif // wxUSE_DATAOBJ