src/x11/dataobj.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/x11/dataobj.cpp
   3 // Purpose:     wxDataObject class
   4 // Author:      Julian Smart
   5 // Id:          $Id$
   6 // Copyright:   (c) 1998 Julian Smart
   7 // Licence:     wxWindows licence
   8 ///////////////////////////////////////////////////////////////////////////////
   9
  10 // for compilers that support precompilation, includes "wx.h".
  11 #include "wx/wxprec.h"
  12
  13 #if wxUSE_DATAOBJ
  14
  15 #include "wx/dataobj.h"
  16
  17 #ifndef WX_PRECOMP
  18     #include "wx/log.h"
  19     #include "wx/app.h"
  20     #include "wx/utils.h"
  21     #include "wx/image.h"
  22 #endif
  23
  24 #include "wx/mstream.h"
  25
  26 #include "wx/x11/private.h"
  27
  28 //-------------------------------------------------------------------------
  29 // global data
  30 //-------------------------------------------------------------------------
  31
  32 Atom  g_textAtom        = 0;
  33 Atom  g_pngAtom         = 0;
  34 Atom  g_fileAtom        = 0;
  35
  36 //-------------------------------------------------------------------------
  37 // wxDataFormat
  38 //-------------------------------------------------------------------------
  39
  40 wxDataFormat::wxDataFormat()
  41 {
  42     // do *not* call PrepareFormats() from here for 2 reasons:
  43     //
  44     // 1. we will have time to do it later because some other Set function
  45     //    must be called before we really need them
  46     //
  47     // 2. doing so prevents us from declaring global wxDataFormats because
  48     //    calling PrepareFormats (and thus gdk_atom_intern) before GDK is
  49     //    initialised will result in a crash
  50     m_type = wxDF_INVALID;
  51     m_format = (Atom) 0;
  52 }
  53
  54 wxDataFormat::wxDataFormat( wxDataFormatId type )
  55 {
  56     PrepareFormats();
  57     SetType( type );
  58 }
  59
  60 wxDataFormat::wxDataFormat( const wxChar *id )
  61 {
  62     PrepareFormats();
  63     SetId( id );
  64 }
  65
  66 wxDataFormat::wxDataFormat( const wxString &id )
  67 {
  68     PrepareFormats();
  69     SetId( id );
  70 }
  71
  72 wxDataFormat::wxDataFormat( NativeFormat format )
  73 {
  74     PrepareFormats();
  75     SetId( format );
  76 }
  77
  78 void wxDataFormat::SetType( wxDataFormatId type )
  79 {
  80     PrepareFormats();
  81     m_type = type;
  82
  83     if (m_type == wxDF_TEXT || m_type == wxDF_UNICODETEXT)
  84         m_format = g_textAtom;
  85     else
  86     if (m_type == wxDF_BITMAP)
  87         m_format = g_pngAtom;
  88     else
  89     if (m_type == wxDF_FILENAME)
  90         m_format = g_fileAtom;
  91     else
  92     {
  93        wxFAIL_MSG( wxT("invalid dataformat") );
  94     }
  95 }
  96
  97 wxDataFormatId wxDataFormat::GetType() const
  98 {
  99     return m_type;
 100 }
 101
 102 wxString wxDataFormat::GetId() const
 103 {
 104 #if wxUSE_NANOX
 105     return wxEmptyString;
 106 #else
 107     char *t = XGetAtomName ((Display*) wxGetDisplay(), m_format);
 108     wxString ret = wxString::FromAscii( t );
 109     if (t)
 110         XFree( t );
 111     return ret;
 112 #endif
 113 }
 114
 115 void wxDataFormat::SetId( NativeFormat format )
 116 {
 117     PrepareFormats();
 118     m_format = format;
 119
 120     if (m_format == g_textAtom)
 121         m_type = wxDF_TEXT;
 122     else
 123     if (m_format == g_pngAtom)
 124         m_type = wxDF_BITMAP;
 125     else
 126     if (m_format == g_fileAtom)
 127         m_type = wxDF_FILENAME;
 128     else
 129         m_type = wxDF_PRIVATE;
 130 }
 131
 132 void wxDataFormat::SetId( const wxChar *id )
 133 {
 134 #if !wxUSE_NANOX
 135     PrepareFormats();
 136     m_type = wxDF_PRIVATE;
 137     wxString tmp( id );
 138     m_format = XInternAtom( (Display*) wxGetDisplay(), tmp.ToAscii(), FALSE );
 139 #endif
 140 }
 141
 142 void wxDataFormat::PrepareFormats()
 143 {
 144 #if !wxUSE_NANOX
 145     if (!g_textAtom)
 146         g_textAtom = XInternAtom( (Display*) wxGetDisplay(), "STRING", FALSE );
 147     if (!g_pngAtom)
 148         g_pngAtom = XInternAtom( (Display*) wxGetDisplay(), "image/png", FALSE );
 149     if (!g_fileAtom)
 150         g_fileAtom = XInternAtom( (Display*) wxGetDisplay(), "text/uri-list", FALSE );
 151 #endif
 152 }
 153
 154 //-------------------------------------------------------------------------
 155 // wxDataObject
 156 //-------------------------------------------------------------------------
 157
 158 wxDataObject::wxDataObject()
 159 {
 160 }
 161
 162 bool wxDataObject::IsSupportedFormat(const wxDataFormat& format, Direction dir) const
 163 {
 164     size_t nFormatCount = GetFormatCount(dir);
 165     if ( nFormatCount == 1 )
 166     {
 167         return format == GetPreferredFormat();
 168     }
 169     else
 170     {
 171         wxDataFormat *formats = new wxDataFormat[nFormatCount];
 172         GetAllFormats(formats,dir);
 173
 174         size_t n;
 175         for ( n = 0; n < nFormatCount; n++ )
 176         {
 177             if ( formats[n] == format )
 178                 break;
 179         }
 180
 181         delete [] formats;
 182
 183         // found?
 184         return n < nFormatCount;
 185     }
 186 }
 187
 188 // ----------------------------------------------------------------------------
 189 // wxFileDataObject
 190 // ----------------------------------------------------------------------------
 191
 192 bool wxFileDataObject::GetDataHere(void *buf) const
 193 {
 194     wxString filenames;
 195
 196     for (size_t i = 0; i < m_filenames.GetCount(); i++)
 197     {
 198         filenames += m_filenames[i];
 199         filenames += (wxChar) 0;
 200     }
 201
 202     memcpy( buf, filenames.mbc_str(), filenames.length() + 1 );
 203
 204     return true;
 205 }
 206
 207 size_t wxFileDataObject::GetDataSize() const
 208 {
 209     size_t res = 0;
 210
 211     for (size_t i = 0; i < m_filenames.GetCount(); i++)
 212     {
 213         res += m_filenames[i].length();
 214         res += 1;
 215     }
 216
 217     return res + 1;
 218 }
 219
 220 bool wxFileDataObject::SetData(size_t WXUNUSED(size), const void *buf)
 221 {
 222     // VZ: old format
 223 #if 0
 224     // filenames are stores as a string with #0 as deliminators
 225     const char *filenames = (const char*) buf;
 226     size_t pos = 0;
 227     for(;;)
 228     {
 229         if (filenames[0] == 0)
 230             break;
 231         if (pos >= size)
 232             break;
 233         wxString file( filenames );  // this returns the first file
 234         AddFile( file );
 235         pos += file.length()+1;
 236         filenames += file.length()+1;
 237     }
 238 #else // 1
 239     m_filenames.Empty();
 240
 241     // the text/uri-list format is a sequence of URIs (filenames prefixed by
 242     // "file:" as far as I see) delimited by "\r\n" of total length size
 243     // (I wonder what happens if the file has '\n' in its filename??)
 244     wxString filename;
 245     for ( const char *p = (const char *)buf; ; p++ )
 246     {
 247         // some broken programs (testdnd GTK+ sample!) omit the trailing
 248         // "\r\n", so check for '\0' explicitly here instead of doing it in
 249         // the loop statement to account for it
 250         if ( (*p == '\r' && *(p+1) == '\n') || !*p )
 251         {
 252             size_t lenPrefix = 5; // strlen("file:")
 253             if ( filename.Left(lenPrefix).MakeLower() == _T("file:") )
 254             {
 255                 // sometimes the syntax is "file:filename", sometimes it's
 256                 // URL-like: "file://filename" - deal with both
 257                 if ( filename[lenPrefix] == _T('/') &&
 258                      filename[lenPrefix + 1] == _T('/') )
 259                 {
 260                     // skip the slashes
 261                     lenPrefix += 2;
 262                 }
 263
 264                 AddFile(filename.c_str() + lenPrefix);
 265                 filename.Empty();
 266             }
 267             else
 268             {
 269                 wxLogDebug(_T("Unsupported URI '%s' in wxFileDataObject"),
 270                            filename.c_str());
 271             }
 272
 273             if ( !*p )
 274                 break;
 275
 276             // skip '\r'
 277             p++;
 278         }
 279         else
 280         {
 281             filename += *p;
 282         }
 283     }
 284 #endif // 0/1
 285
 286     return true;
 287 }
 288
 289 void wxFileDataObject::AddFile( const wxString &filename )
 290 {
 291    m_filenames.Add( filename );
 292 }
 293
 294 // ----------------------------------------------------------------------------
 295 // wxBitmapDataObject
 296 // ----------------------------------------------------------------------------
 297
 298 wxBitmapDataObject::wxBitmapDataObject()
 299 {
 300     Init();
 301 }
 302
 303 wxBitmapDataObject::wxBitmapDataObject( const wxBitmap& bitmap )
 304                   : wxBitmapDataObjectBase(bitmap)
 305 {
 306     Init();
 307
 308     DoConvertToPng();
 309 }
 310
 311 wxBitmapDataObject::~wxBitmapDataObject()
 312 {
 313     Clear();
 314 }
 315
 316 void wxBitmapDataObject::SetBitmap( const wxBitmap &bitmap )
 317 {
 318     ClearAll();
 319
 320     wxBitmapDataObjectBase::SetBitmap(bitmap);
 321
 322     DoConvertToPng();
 323 }
 324
 325 bool wxBitmapDataObject::GetDataHere(void *buf) const
 326 {
 327     if ( !m_pngSize )
 328     {
 329         wxFAIL_MSG( wxT("attempt to copy empty bitmap failed") );
 330
 331         return false;
 332     }
 333
 334     memcpy(buf, m_pngData, m_pngSize);
 335
 336     return true;
 337 }
 338
 339 bool wxBitmapDataObject::SetData(size_t size, const void *buf)
 340 {
 341     Clear();
 342
 343 #if wxUSE_LIBPNG
 344     m_pngSize = size;
 345     m_pngData = malloc(m_pngSize);
 346
 347     memcpy( m_pngData, buf, m_pngSize );
 348
 349     wxMemoryInputStream mstream( (char*) m_pngData, m_pngSize );
 350     wxImage image;
 351     wxPNGHandler handler;
 352     if ( !handler.LoadFile( &image, mstream ) )
 353     {
 354         return false;
 355     }
 356
 357     m_bitmap = image;
 358
 359     return m_bitmap.Ok();
 360 #else
 361     return false;
 362 #endif
 363 }
 364
 365 void wxBitmapDataObject::DoConvertToPng()
 366 {
 367 #if wxUSE_LIBPNG
 368     if (!m_bitmap.Ok())
 369         return;
 370
 371     wxImage image = m_bitmap.ConvertToImage();
 372     wxPNGHandler handler;
 373
 374     wxCountingOutputStream count;
 375     handler.SaveFile( &image, count );
 376
 377     m_pngSize = count.GetSize() + 100; // sometimes the size seems to vary ???
 378     m_pngData = malloc(m_pngSize);
 379
 380     wxMemoryOutputStream mstream( (char*) m_pngData, m_pngSize );
 381     handler.SaveFile( &image, mstream );
 382 #endif
 383 }
 384
 385 #endif // wxUSE_DATAOBJ