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 wxDataObject::~wxDataObject()
 162 {
 163     // dtor is empty but needed for Darwin and AIX -- otherwise it doesn't link
 164 }
 165
 166 bool wxDataObject::IsSupportedFormat(const wxDataFormat& format, Direction dir) const
 167 {
 168     size_t nFormatCount = GetFormatCount(dir);
 169     if ( nFormatCount == 1 )
 170     {
 171         return format == GetPreferredFormat();
 172     }
 173     else
 174     {
 175         wxDataFormat *formats = new wxDataFormat[nFormatCount];
 176         GetAllFormats(formats,dir);
 177
 178         size_t n;
 179         for ( n = 0; n < nFormatCount; n++ )
 180         {
 181             if ( formats[n] == format )
 182                 break;
 183         }
 184
 185         delete [] formats;
 186
 187         // found?
 188         return n < nFormatCount;
 189     }
 190 }
 191
 192 // ----------------------------------------------------------------------------
 193 // wxFileDataObject
 194 // ----------------------------------------------------------------------------
 195
 196 bool wxFileDataObject::GetDataHere(void *buf) const
 197 {
 198     wxString filenames;
 199
 200     for (size_t i = 0; i < m_filenames.GetCount(); i++)
 201     {
 202         filenames += m_filenames[i];
 203         filenames += (wxChar) 0;
 204     }
 205
 206     memcpy( buf, filenames.mbc_str(), filenames.Len() + 1 );
 207
 208     return TRUE;
 209 }
 210
 211 size_t wxFileDataObject::GetDataSize() const
 212 {
 213     size_t res = 0;
 214
 215     for (size_t i = 0; i < m_filenames.GetCount(); i++)
 216     {
 217         res += m_filenames[i].Len();
 218         res += 1;
 219     }
 220
 221     return res + 1;
 222 }
 223
 224 bool wxFileDataObject::SetData(size_t WXUNUSED(size), const void *buf)
 225 {
 226     // VZ: old format
 227 #if 0
 228     // filenames are stores as a string with #0 as deliminators
 229     const char *filenames = (const char*) buf;
 230     size_t pos = 0;
 231     for(;;)
 232     {
 233         if (filenames[0] == 0)
 234             break;
 235         if (pos >= size)
 236             break;
 237         wxString file( filenames );  // this returns the first file
 238         AddFile( file );
 239         pos += file.Len()+1;
 240         filenames += file.Len()+1;
 241     }
 242 #else // 1
 243     m_filenames.Empty();
 244
 245     // the text/uri-list format is a sequence of URIs (filenames prefixed by
 246     // "file:" as far as I see) delimited by "\r\n" of total length size
 247     // (I wonder what happens if the file has '\n' in its filename??)
 248     wxString filename;
 249     for ( const char *p = (const char *)buf; ; p++ )
 250     {
 251         // some broken programs (testdnd GTK+ sample!) omit the trailing
 252         // "\r\n", so check for '\0' explicitly here instead of doing it in
 253         // the loop statement to account for it
 254         if ( (*p == '\r' && *(p+1) == '\n') || !*p )
 255         {
 256             size_t lenPrefix = 5; // strlen("file:")
 257             if ( filename.Left(lenPrefix).MakeLower() == _T("file:") )
 258             {
 259                 // sometimes the syntax is "file:filename", sometimes it's
 260                 // URL-like: "file://filename" - deal with both
 261                 if ( filename[lenPrefix] == _T('/') &&
 262                      filename[lenPrefix + 1] == _T('/') )
 263                 {
 264                     // skip the slashes
 265                     lenPrefix += 2;
 266                 }
 267
 268                 AddFile(filename.c_str() + lenPrefix);
 269                 filename.Empty();
 270             }
 271             else
 272             {
 273                 wxLogDebug(_T("Unsupported URI '%s' in wxFileDataObject"),
 274                            filename.c_str());
 275             }
 276
 277             if ( !*p )
 278                 break;
 279
 280             // skip '\r'
 281             p++;
 282         }
 283         else
 284         {
 285             filename += *p;
 286         }
 287     }
 288 #endif // 0/1
 289
 290     return TRUE;
 291 }
 292
 293 void wxFileDataObject::AddFile( const wxString &filename )
 294 {
 295    m_filenames.Add( filename );
 296 }
 297
 298 // ----------------------------------------------------------------------------
 299 // wxBitmapDataObject
 300 // ----------------------------------------------------------------------------
 301
 302 wxBitmapDataObject::wxBitmapDataObject()
 303 {
 304     Init();
 305 }
 306
 307 wxBitmapDataObject::wxBitmapDataObject( const wxBitmap& bitmap )
 308                   : wxBitmapDataObjectBase(bitmap)
 309 {
 310     Init();
 311
 312     DoConvertToPng();
 313 }
 314
 315 wxBitmapDataObject::~wxBitmapDataObject()
 316 {
 317     Clear();
 318 }
 319
 320 void wxBitmapDataObject::SetBitmap( const wxBitmap &bitmap )
 321 {
 322     ClearAll();
 323
 324     wxBitmapDataObjectBase::SetBitmap(bitmap);
 325
 326     DoConvertToPng();
 327 }
 328
 329 bool wxBitmapDataObject::GetDataHere(void *buf) const
 330 {
 331     if ( !m_pngSize )
 332     {
 333         wxFAIL_MSG( wxT("attempt to copy empty bitmap failed") );
 334
 335         return FALSE;
 336     }
 337
 338     memcpy(buf, m_pngData, m_pngSize);
 339
 340     return TRUE;
 341 }
 342
 343 bool wxBitmapDataObject::SetData(size_t size, const void *buf)
 344 {
 345     Clear();
 346
 347     wxCHECK_MSG( wxImage::FindHandler(wxBITMAP_TYPE_PNG) != NULL,
 348                  FALSE, wxT("You must call wxImage::AddHandler(new wxPNGHandler); to be able to use clipboard with bitmaps!") );
 349
 350     m_pngSize = size;
 351     m_pngData = malloc(m_pngSize);
 352
 353     memcpy(m_pngData, buf, m_pngSize);
 354
 355     wxMemoryInputStream mstream((char*) m_pngData, m_pngSize);
 356     wxImage image;
 357     if ( !image.LoadFile( mstream, wxBITMAP_TYPE_PNG ) )
 358     {
 359         return FALSE;
 360     }
 361
 362     m_bitmap = wxBitmap(image);
 363
 364     return m_bitmap.Ok();
 365 }
 366
 367 void wxBitmapDataObject::DoConvertToPng()
 368 {
 369     if ( !m_bitmap.Ok() )
 370         return;
 371
 372     wxCHECK_RET( wxImage::FindHandler(wxBITMAP_TYPE_PNG) != NULL,
 373                  wxT("You must call wxImage::AddHandler(new wxPNGHandler); to be able to use clipboard with bitmaps!") );
 374
 375     wxImage image = m_bitmap.ConvertToImage();
 376
 377     wxCountingOutputStream count;
 378     image.SaveFile(count, wxBITMAP_TYPE_PNG);
 379
 380     m_pngSize = count.GetSize() + 100; // sometimes the size seems to vary ???
 381     m_pngData = malloc(m_pngSize);
 382
 383     wxMemoryOutputStream mstream((char*) m_pngData, m_pngSize);
 384     image.SaveFile(mstream, wxBITMAP_TYPE_PNG);
 385 }
 386
 387