src/gtk/dataobj.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        dataobj.cpp
   3 // Purpose:     wxDataObject class
   4 // Author:      Robert Roebling
   5 // Id:          $Id$
   6 // Copyright:   (c) 1998 Robert Roebling
   7 // Licence:     wxWindows licence
   8 ///////////////////////////////////////////////////////////////////////////////
   9
  10 #ifdef __GNUG__
  11     #pragma implementation "dataobj.h"
  12 #endif
  13
  14 #include "wx/dataobj.h"
  15 #include "wx/app.h"
  16 #include "wx/debug.h"
  17 #include "wx/mstream.h"
  18 #include "wx/image.h"
  19 #include "wx/log.h"
  20
  21 #include <gdk/gdk.h>
  22
  23 //-------------------------------------------------------------------------
  24 // global data
  25 //-------------------------------------------------------------------------
  26
  27 GdkAtom  g_textAtom        = 0;
  28 GdkAtom  g_pngAtom         = 0;
  29 GdkAtom  g_fileAtom        = 0;
  30
  31 //-------------------------------------------------------------------------
  32 // wxDataFormat
  33 //-------------------------------------------------------------------------
  34
  35 wxDataFormat::wxDataFormat()
  36 {
  37     // do *not* call PrepareFormats() from here for 2 reasons:
  38     //
  39     // 1. we will have time to do it later because some other Set function
  40     //    must be called before we really need them
  41     //
  42     // 2. doing so prevents us from declaring global wxDataFormats because
  43     //    calling PrepareFormats (and thus gdk_atom_intern) before GDK is
  44     //    initialised will result in a crash
  45     m_type = wxDF_INVALID;
  46     m_format = (GdkAtom) 0;
  47 }
  48
  49 wxDataFormat::wxDataFormat( wxDataFormatId type )
  50 {
  51     PrepareFormats();
  52     SetType( type );
  53 }
  54
  55 wxDataFormat::wxDataFormat( const wxChar *id )
  56 {
  57     PrepareFormats();
  58     SetId( id );
  59 }
  60
  61 wxDataFormat::wxDataFormat( const wxString &id )
  62 {
  63     PrepareFormats();
  64     SetId( id );
  65 }
  66
  67 wxDataFormat::wxDataFormat( NativeFormat format )
  68 {
  69     PrepareFormats();
  70     SetId( format );
  71 }
  72
  73 void wxDataFormat::SetType( wxDataFormatId type )
  74 {
  75     PrepareFormats();
  76
  77     if (type == wxDF_UNICODETEXT)
  78        type = wxDF_TEXT;
  79
  80     m_type = type;
  81
  82     if (m_type == wxDF_TEXT)
  83         m_format = g_textAtom;
  84     else
  85     if (m_type == wxDF_BITMAP)
  86         m_format = g_pngAtom;
  87     else
  88     if (m_type == wxDF_FILENAME)
  89         m_format = g_fileAtom;
  90     else
  91     {
  92        wxFAIL_MSG( wxT("invalid dataformat") );
  93     }
  94 }
  95
  96 wxDataFormatId wxDataFormat::GetType() const
  97 {
  98     return m_type;
  99 }
 100
 101 wxString wxDataFormat::GetId() const
 102 {
 103     wxString ret = wxString::FromAscii( gdk_atom_name( m_format ) );
 104     return ret;
 105 }
 106
 107 void wxDataFormat::SetId( NativeFormat format )
 108 {
 109     PrepareFormats();
 110     m_format = format;
 111
 112     if (m_format == g_textAtom)
 113         m_type = wxDF_TEXT;
 114     else
 115     if (m_format == g_pngAtom)
 116         m_type = wxDF_BITMAP;
 117     else
 118     if (m_format == g_fileAtom)
 119         m_type = wxDF_FILENAME;
 120     else
 121         m_type = wxDF_PRIVATE;
 122 }
 123
 124 void wxDataFormat::SetId( const wxChar *id )
 125 {
 126     PrepareFormats();
 127     m_type = wxDF_PRIVATE;
 128     wxString tmp( id );
 129     m_format = gdk_atom_intern( (const char*) tmp.ToAscii(), FALSE );
 130 }
 131
 132 void wxDataFormat::PrepareFormats()
 133 {
 134     // VZ: GNOME included in RedHat 6.1 uses the MIME types below and not the
 135     //     atoms STRING and file:ALL as the old code was, but normal X apps
 136     //     use STRING for text selection when transfering the data via
 137     //     clipboard, for example, so do use STRING for now (GNOME apps will
 138     //     probably support STRING as well for compatibility anyhow), but use
 139     //     text/uri-list for file dnd because compatibility is not important
 140     //     here (with whom?)
 141     if (!g_textAtom)
 142 #if wxUSE_UNICODE
 143         g_textAtom = gdk_atom_intern( "UTF8_STRING", FALSE );
 144 #else
 145         g_textAtom = gdk_atom_intern( "STRING" /* "text/plain" */, FALSE );
 146 #endif
 147     if (!g_pngAtom)
 148         g_pngAtom = gdk_atom_intern( "image/png", FALSE );
 149     if (!g_fileAtom)
 150         g_fileAtom = gdk_atom_intern( "text/uri-list", FALSE );
 151 }
 152
 153 //-------------------------------------------------------------------------
 154 // wxDataObject
 155 //-------------------------------------------------------------------------
 156
 157 wxDataObject::wxDataObject()
 158 {
 159 }
 160
 161 bool wxDataObject::IsSupportedFormat(const wxDataFormat& format, Direction dir) const
 162 {
 163     size_t nFormatCount = GetFormatCount(dir);
 164     if ( nFormatCount == 1 )
 165     {
 166         return format == GetPreferredFormat();
 167     }
 168     else
 169     {
 170         wxDataFormat *formats = new wxDataFormat[nFormatCount];
 171         GetAllFormats(formats,dir);
 172
 173         size_t n;
 174         for ( n = 0; n < nFormatCount; n++ )
 175         {
 176             if ( formats[n] == format )
 177                 break;
 178         }
 179
 180         delete [] formats;
 181
 182         // found?
 183         return n < nFormatCount;
 184     }
 185 }
 186
 187 // ----------------------------------------------------------------------------
 188 // wxFileDataObject
 189 // ----------------------------------------------------------------------------
 190
 191 bool wxFileDataObject::GetDataHere(void *buf) const
 192 {
 193     wxString filenames;
 194
 195     for (size_t i = 0; i < m_filenames.GetCount(); i++)
 196     {
 197         filenames += m_filenames[i];
 198         filenames += (wxChar) 0;
 199     }
 200
 201     memcpy( buf, filenames.mbc_str(), filenames.Len() + 1 );
 202
 203     return TRUE;
 204 }
 205
 206 size_t wxFileDataObject::GetDataSize() const
 207 {
 208     size_t res = 0;
 209
 210     for (size_t i = 0; i < m_filenames.GetCount(); i++)
 211     {
 212         res += m_filenames[i].Len();
 213         res += 1;
 214     }
 215
 216     return res + 1;
 217 }
 218
 219 bool wxFileDataObject::SetData(size_t WXUNUSED(size), const void *buf)
 220 {
 221     // VZ: old format
 222 #if 0
 223     // filenames are stores as a string with #0 as deliminators
 224     const char *filenames = (const char*) buf;
 225     size_t pos = 0;
 226     for(;;)
 227     {
 228         if (filenames[0] == 0)
 229             break;
 230         if (pos >= size)
 231             break;
 232         wxString file( filenames );  // this returns the first file
 233         AddFile( file );
 234         pos += file.Len()+1;
 235         filenames += file.Len()+1;
 236     }
 237 #else // 1
 238     m_filenames.Empty();
 239
 240     // the text/uri-list format is a sequence of URIs (filenames prefixed by
 241     // "file:" as far as I see) delimited by "\r\n" of total length size
 242     // (I wonder what happens if the file has '\n' in its filename??)
 243     wxString filename;
 244     for ( const char *p = (const char *)buf; ; p++ )
 245     {
 246         // some broken programs (testdnd GTK+ sample!) omit the trailing
 247         // "\r\n", so check for '\0' explicitly here instead of doing it in
 248         // the loop statement to account for it
 249         if ( (*p == '\r' && *(p+1) == '\n') || !*p )
 250         {
 251             size_t lenPrefix = 5; // strlen("file:")
 252             if ( filename.Left(lenPrefix).MakeLower() == _T("file:") )
 253             {
 254                 // sometimes the syntax is "file:filename", sometimes it's
 255                 // URL-like: "file://filename" - deal with both
 256                 if ( filename[lenPrefix] == _T('/') &&
 257                      filename[lenPrefix + 1] == _T('/') )
 258                 {
 259                     // skip the slashes
 260                     lenPrefix += 2;
 261                 }
 262
 263                 AddFile(filename.c_str() + lenPrefix);
 264                 filename.Empty();
 265             }
 266             else
 267             {
 268                 wxLogDebug(_T("Unsupported URI '%s' in wxFileDataObject"),
 269                            filename.c_str());
 270             }
 271
 272             if ( !*p )
 273                 break;
 274
 275             // skip '\r'
 276             p++;
 277         }
 278         else
 279         {
 280             filename += *p;
 281         }
 282     }
 283 #endif // 0/1
 284
 285     return TRUE;
 286 }
 287
 288 void wxFileDataObject::AddFile( const wxString &filename )
 289 {
 290    m_filenames.Add( filename );
 291 }
 292
 293 // ----------------------------------------------------------------------------
 294 // wxBitmapDataObject
 295 // ----------------------------------------------------------------------------
 296
 297 wxBitmapDataObject::wxBitmapDataObject()
 298 {
 299     Init();
 300 }
 301
 302 wxBitmapDataObject::wxBitmapDataObject( const wxBitmap& bitmap )
 303                   : wxBitmapDataObjectBase(bitmap)
 304 {
 305     Init();
 306
 307     DoConvertToPng();
 308 }
 309
 310 wxBitmapDataObject::~wxBitmapDataObject()
 311 {
 312     Clear();
 313 }
 314
 315 void wxBitmapDataObject::SetBitmap( const wxBitmap &bitmap )
 316 {
 317     ClearAll();
 318
 319     wxBitmapDataObjectBase::SetBitmap(bitmap);
 320
 321     DoConvertToPng();
 322 }
 323
 324 bool wxBitmapDataObject::GetDataHere(void *buf) const
 325 {
 326     if ( !m_pngSize )
 327     {
 328         wxFAIL_MSG( wxT("attempt to copy empty bitmap failed") );
 329
 330         return FALSE;
 331     }
 332
 333     memcpy(buf, m_pngData, m_pngSize);
 334
 335     return TRUE;
 336 }
 337
 338 bool wxBitmapDataObject::SetData(size_t size, const void *buf)
 339 {
 340     Clear();
 341
 342     wxCHECK_MSG( wxImage::FindHandler(wxBITMAP_TYPE_PNG) != NULL,
 343                  FALSE, wxT("You must call wxImage::AddHandler(new wxPNGHandler); to be able to use clipboard with bitmaps!") );
 344
 345     m_pngSize = size;
 346     m_pngData = malloc(m_pngSize);
 347
 348     memcpy(m_pngData, buf, m_pngSize);
 349
 350     wxMemoryInputStream mstream((char*) m_pngData, m_pngSize);
 351     wxImage image;
 352     if ( !image.LoadFile( mstream, wxBITMAP_TYPE_PNG ) )
 353     {
 354         return FALSE;
 355     }
 356
 357     m_bitmap = wxBitmap(image);
 358
 359     return m_bitmap.Ok();
 360 }
 361
 362 void wxBitmapDataObject::DoConvertToPng()
 363 {
 364     if ( !m_bitmap.Ok() )
 365         return;
 366
 367     wxCHECK_RET( wxImage::FindHandler(wxBITMAP_TYPE_PNG) != NULL,
 368                  wxT("You must call wxImage::AddHandler(new wxPNGHandler); to be able to use clipboard with bitmaps!") );
 369
 370     wxImage image = m_bitmap.ConvertToImage();
 371
 372     wxCountingOutputStream count;
 373     image.SaveFile(count, wxBITMAP_TYPE_PNG);
 374
 375     m_pngSize = count.GetSize() + 100; // sometimes the size seems to vary ???
 376     m_pngData = malloc(m_pngSize);
 377
 378     wxMemoryOutputStream mstream((char*) m_pngData, m_pngSize);
 379     image.SaveFile(mstream, wxBITMAP_TYPE_PNG);
 380 }
 381
 382