src/x11/dataobj.cpp

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