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 wxDataObjectSimple *
  98 wxDataObjectComposite::GetObject(const wxDataFormat& format) const
  99 {
 100     wxSimpleDataObjectList::Node *node = m_dataObjects.GetFirst();
 101     while ( node )
 102     {
 103         wxDataObjectSimple *dataObj = node->GetData();
 104
 105         if ( dataObj->GetFormat() == format )
 106         {
 107             return dataObj;
 108         }
 109
 110         node = node->GetNext();
 111     }
 112
 113     return (wxDataObjectSimple *)NULL;
 114 }
 115
 116 void wxDataObjectComposite::Add(wxDataObjectSimple *dataObject, bool preferred)
 117 {
 118     if ( preferred )
 119         m_preferred = m_dataObjects.GetCount();
 120
 121     m_dataObjects.Append( dataObject );
 122 }
 123
 124 wxDataFormat
 125 wxDataObjectComposite::GetPreferredFormat(Direction WXUNUSED(dir)) const
 126 {
 127     wxSimpleDataObjectList::Node *node = m_dataObjects.Item( m_preferred );
 128
 129     wxCHECK_MSG( node, wxFormatInvalid, wxT("no preferred format") );
 130
 131     wxDataObjectSimple* dataObj = node->GetData();
 132
 133     return dataObj->GetFormat();
 134 }
 135
 136 size_t wxDataObjectComposite::GetFormatCount(Direction WXUNUSED(dir)) const
 137 {
 138     // TODO what about the Get/Set only formats?
 139     return m_dataObjects.GetCount();
 140 }
 141
 142 void wxDataObjectComposite::GetAllFormats(wxDataFormat *formats,
 143                                           Direction WXUNUSED(dir)) const
 144 {
 145     size_t n = 0;
 146     wxSimpleDataObjectList::Node *node;
 147     for ( node = m_dataObjects.GetFirst(); node; node = node->GetNext() )
 148     {
 149         // TODO if ( !outputOnlyToo ) && this one counts ...
 150         formats[n++] = node->GetData()->GetFormat();
 151     }
 152 }
 153
 154 size_t wxDataObjectComposite::GetDataSize(const wxDataFormat& format) const
 155 {
 156     wxDataObjectSimple *dataObj = GetObject(format);
 157
 158     wxCHECK_MSG( dataObj, 0,
 159                  wxT("unsupported format in wxDataObjectComposite"));
 160
 161     return dataObj->GetDataSize();
 162 }
 163
 164 bool wxDataObjectComposite::GetDataHere(const wxDataFormat& format,
 165                                         void *buf) const
 166 {
 167     wxDataObjectSimple *dataObj = GetObject(format);
 168
 169     wxCHECK_MSG( dataObj, FALSE,
 170                  wxT("unsupported format in wxDataObjectComposite"));
 171
 172     return dataObj->GetDataHere(buf);
 173 }
 174
 175 bool wxDataObjectComposite::SetData(const wxDataFormat& format,
 176                                     size_t len,
 177                                     const void *buf)
 178 {
 179     wxDataObjectSimple *dataObj = GetObject(format);
 180
 181     wxCHECK_MSG( dataObj, FALSE,
 182                  wxT("unsupported format in wxDataObjectComposite"));
 183
 184     return dataObj->SetData(len, buf);
 185 }
 186
 187 // ----------------------------------------------------------------------------
 188 // wxTextDataObject
 189 // ----------------------------------------------------------------------------
 190
 191 size_t wxTextDataObject::GetDataSize() const
 192 {
 193     return GetTextLength();
 194 }
 195
 196 bool wxTextDataObject::GetDataHere(void *buf) const
 197 {
 198     strcpy((char *)buf, GetText().mb_str());
 199
 200     return TRUE;
 201 }
 202
 203 bool wxTextDataObject::SetData(size_t WXUNUSED(len), const void *buf)
 204 {
 205     SetText(wxString((const char *)buf));
 206
 207     return TRUE;
 208 }
 209
 210 // ----------------------------------------------------------------------------
 211 // wxFileDataObjectBase
 212 // ----------------------------------------------------------------------------
 213
 214 // VZ: I don't need this in MSW finally, so if it is needed in wxGTK, it should
 215 //     be moved to gtk/dataobj.cpp
 216 #if 0
 217
 218 wxString wxFileDataObjectBase::GetFilenames() const
 219 {
 220     wxString str;
 221     size_t count = m_filenames.GetCount();
 222     for ( size_t n = 0; n < count; n++ )
 223     {
 224         str << m_filenames[n] << wxT('\0');
 225     }
 226
 227     return str;
 228 }
 229
 230 void wxFileDataObjectBase::SetFilenames(const wxChar* filenames)
 231 {
 232     m_filenames.Empty();
 233
 234     wxString current;
 235     for ( const wxChar *pc = filenames; ; pc++ )
 236     {
 237         if ( *pc )
 238         {
 239             current += *pc;
 240         }
 241         else
 242         {
 243             if ( !current )
 244             {
 245                 // 2 consecutive NULs - this is the end of the string
 246                 break;
 247             }
 248
 249             m_filenames.Add(current);
 250             current.Empty();
 251         }
 252     }
 253 }
 254
 255 #endif // 0
 256
 257 // ----------------------------------------------------------------------------
 258 // wxCustomDataObject
 259 // ----------------------------------------------------------------------------
 260
 261 wxCustomDataObject::wxCustomDataObject(const wxDataFormat& format)
 262     : wxDataObjectSimple(format)
 263 {
 264     m_data = (void *)NULL;
 265 }
 266
 267 wxCustomDataObject::~wxCustomDataObject()
 268 {
 269     Free();
 270 }
 271
 272 void wxCustomDataObject::TakeData(size_t size, void *data)
 273 {
 274     Free();
 275
 276     m_size = size;
 277     m_data = data;
 278 }
 279
 280 void *wxCustomDataObject::Alloc(size_t size)
 281 {
 282     return (void *)new char[size];
 283 }
 284
 285 void wxCustomDataObject::Free()
 286 {
 287     delete [] (char *)m_data;
 288     m_size = 0;
 289     m_data = (void *)NULL;
 290 }
 291
 292 size_t wxCustomDataObject::GetDataSize() const
 293 {
 294     return GetSize();
 295 }
 296
 297 bool wxCustomDataObject::GetDataHere(void *buf) const
 298 {
 299     void *data = GetData();
 300     if ( !data )
 301         return FALSE;
 302
 303     memcpy(buf, data, GetSize());
 304
 305     return TRUE;
 306 }
 307
 308 bool wxCustomDataObject::SetData(size_t size, const void *buf)
 309 {
 310     Free();
 311
 312     m_data = Alloc(size);
 313     if ( !m_data )
 314         return FALSE;
 315
 316     memcpy(m_data, buf, m_size = size);
 317
 318     return TRUE;
 319 }
 320
 321 // ============================================================================
 322 // some common dnd related code
 323 // ============================================================================
 324
 325 #if wxUSE_DRAG_AND_DROP
 326
 327 #include "wx/dnd.h"
 328
 329 // ----------------------------------------------------------------------------
 330 // wxTextDropTarget
 331 // ----------------------------------------------------------------------------
 332
 333 // NB: we can't use "new" in ctor initializer lists because this provokes an
 334 //     internal compiler error with VC++ 5.0 (hey, even gcc compiles this!),
 335 //     so use SetDataObject() instead
 336
 337 wxTextDropTarget::wxTextDropTarget()
 338 {
 339     SetDataObject(new wxTextDataObject);
 340 }
 341
 342 wxDragResult wxTextDropTarget::OnData(wxCoord x, wxCoord y, wxDragResult def)
 343 {
 344     if ( !GetData() )
 345         return wxDragNone;
 346
 347     wxTextDataObject *dobj = (wxTextDataObject *)m_dataObject;
 348     return OnDropText(x, y, dobj->GetText()) ? def : wxDragNone;
 349 }
 350
 351 // ----------------------------------------------------------------------------
 352 // wxFileDropTarget
 353 // ----------------------------------------------------------------------------
 354
 355 wxFileDropTarget::wxFileDropTarget()
 356 {
 357     SetDataObject(new wxFileDataObject);
 358 }
 359
 360 wxDragResult wxFileDropTarget::OnData(wxCoord x, wxCoord y, wxDragResult def)
 361 {
 362     if ( !GetData() )
 363         return wxDragNone;
 364
 365     wxFileDataObject *dobj = (wxFileDataObject *)m_dataObject;
 366     return OnDropFiles(x, y, dobj->GetFilenames()) ? def : wxDragNone;
 367 }
 368
 369 #endif // wxUSE_DRAG_AND_DROP
 370
 371 #endif // wxUSE_DATAOBJ