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