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, FALSE,
 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, FALSE,
 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, FALSE,
 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     return GetTextLength() * sizeof(wxChar);
 238 }
 239
 240 bool wxTextDataObject::GetDataHere(void *buf) const
 241 {
 242     wxStrcpy((wxChar *)buf, GetText().c_str());
 243
 244     return TRUE;
 245 }
 246
 247 bool wxTextDataObject::SetData(size_t WXUNUSED(len), const void *buf)
 248 {
 249     SetText(wxString((const wxChar *)buf));
 250
 251     return TRUE;
 252 }
 253
 254 // ----------------------------------------------------------------------------
 255 // wxFileDataObjectBase
 256 // ----------------------------------------------------------------------------
 257
 258 // VZ: I don't need this in MSW finally, so if it is needed in wxGTK, it should
 259 //     be moved to gtk/dataobj.cpp
 260 #if 0
 261
 262 wxString wxFileDataObjectBase::GetFilenames() const
 263 {
 264     wxString str;
 265     size_t count = m_filenames.GetCount();
 266     for ( size_t n = 0; n < count; n++ )
 267     {
 268         str << m_filenames[n] << wxT('\0');
 269     }
 270
 271     return str;
 272 }
 273
 274 void wxFileDataObjectBase::SetFilenames(const wxChar* filenames)
 275 {
 276     m_filenames.Empty();
 277
 278     wxString current;
 279     for ( const wxChar *pc = filenames; ; pc++ )
 280     {
 281         if ( *pc )
 282         {
 283             current += *pc;
 284         }
 285         else
 286         {
 287             if ( !current )
 288             {
 289                 // 2 consecutive NULs - this is the end of the string
 290                 break;
 291             }
 292
 293             m_filenames.Add(current);
 294             current.Empty();
 295         }
 296     }
 297 }
 298
 299 #endif // 0
 300
 301 // ----------------------------------------------------------------------------
 302 // wxCustomDataObject
 303 // ----------------------------------------------------------------------------
 304
 305 wxCustomDataObject::wxCustomDataObject(const wxDataFormat& format)
 306     : wxDataObjectSimple(format)
 307 {
 308     m_data = (void *)NULL;
 309 }
 310
 311 wxCustomDataObject::~wxCustomDataObject()
 312 {
 313     Free();
 314 }
 315
 316 void wxCustomDataObject::TakeData(size_t size, void *data)
 317 {
 318     Free();
 319
 320     m_size = size;
 321     m_data = data;
 322 }
 323
 324 void *wxCustomDataObject::Alloc(size_t size)
 325 {
 326     return (void *)new char[size];
 327 }
 328
 329 void wxCustomDataObject::Free()
 330 {
 331     delete [] (char *)m_data;
 332     m_size = 0;
 333     m_data = (void *)NULL;
 334 }
 335
 336 size_t wxCustomDataObject::GetDataSize() const
 337 {
 338     return GetSize();
 339 }
 340
 341 bool wxCustomDataObject::GetDataHere(void *buf) const
 342 {
 343     void *data = GetData();
 344     if ( !data )
 345         return FALSE;
 346
 347     memcpy(buf, data, GetSize());
 348
 349     return TRUE;
 350 }
 351
 352 bool wxCustomDataObject::SetData(size_t size, const void *buf)
 353 {
 354     Free();
 355
 356     m_data = Alloc(size);
 357     if ( !m_data )
 358         return FALSE;
 359
 360     memcpy(m_data, buf, m_size = size);
 361
 362     return TRUE;
 363 }
 364
 365 // ============================================================================
 366 // some common dnd related code
 367 // ============================================================================
 368
 369 #if wxUSE_DRAG_AND_DROP
 370
 371 #include "wx/dnd.h"
 372
 373 // ----------------------------------------------------------------------------
 374 // wxTextDropTarget
 375 // ----------------------------------------------------------------------------
 376
 377 // NB: we can't use "new" in ctor initializer lists because this provokes an
 378 //     internal compiler error with VC++ 5.0 (hey, even gcc compiles this!),
 379 //     so use SetDataObject() instead
 380
 381 wxTextDropTarget::wxTextDropTarget()
 382 {
 383     SetDataObject(new wxTextDataObject);
 384 }
 385
 386 wxDragResult wxTextDropTarget::OnData(wxCoord x, wxCoord y, wxDragResult def)
 387 {
 388     if ( !GetData() )
 389         return wxDragNone;
 390
 391     wxTextDataObject *dobj = (wxTextDataObject *)m_dataObject;
 392     return OnDropText(x, y, dobj->GetText()) ? def : wxDragNone;
 393 }
 394
 395 // ----------------------------------------------------------------------------
 396 // wxFileDropTarget
 397 // ----------------------------------------------------------------------------
 398
 399 wxFileDropTarget::wxFileDropTarget()
 400 {
 401     SetDataObject(new wxFileDataObject);
 402 }
 403
 404 wxDragResult wxFileDropTarget::OnData(wxCoord x, wxCoord y, wxDragResult def)
 405 {
 406     if ( !GetData() )
 407         return wxDragNone;
 408
 409     wxFileDataObject *dobj = (wxFileDataObject *)m_dataObject;
 410     return OnDropFiles(x, y, dobj->GetFilenames()) ? def : wxDragNone;
 411 }
 412
 413 #endif // wxUSE_DRAG_AND_DROP
 414
 415 #endif // wxUSE_DATAOBJ