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 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  11     #pragma implementation "dataobj.h"
  12 #endif
  13
  14 // For compilers that support precompilation, includes "wx.h".
  15 #include "wx/wxprec.h"
  16
  17 #include "wx/dataobj.h"
  18 #include "wx/app.h"
  19 #include "wx/debug.h"
  20 #include "wx/mstream.h"
  21 #include "wx/image.h"
  22 #include "wx/log.h"
  23
  24 #include <gdk/gdk.h>
  25
  26 //-------------------------------------------------------------------------
  27 // global data
  28 //-------------------------------------------------------------------------
  29
  30 GdkAtom  g_textAtom        = 0;
  31 GdkAtom  g_pngAtom         = 0;
  32 GdkAtom  g_fileAtom        = 0;
  33
  34 //-------------------------------------------------------------------------
  35 // wxDataFormat
  36 //-------------------------------------------------------------------------
  37
  38 wxDataFormat::wxDataFormat()
  39 {
  40     // do *not* call PrepareFormats() from here for 2 reasons:
  41     //
  42     // 1. we will have time to do it later because some other Set function
  43     //    must be called before we really need them
  44     //
  45     // 2. doing so prevents us from declaring global wxDataFormats because
  46     //    calling PrepareFormats (and thus gdk_atom_intern) before GDK is
  47     //    initialised will result in a crash
  48     m_type = wxDF_INVALID;
  49     m_format = (GdkAtom) 0;
  50 }
  51
  52 wxDataFormat::wxDataFormat( wxDataFormatId type )
  53 {
  54     PrepareFormats();
  55     SetType( type );
  56 }
  57
  58 wxDataFormat::wxDataFormat( const wxChar *id )
  59 {
  60     PrepareFormats();
  61     SetId( id );
  62 }
  63
  64 wxDataFormat::wxDataFormat( const wxString &id )
  65 {
  66     PrepareFormats();
  67     SetId( id );
  68 }
  69
  70 wxDataFormat::wxDataFormat( NativeFormat format )
  71 {
  72     PrepareFormats();
  73     SetId( format );
  74 }
  75
  76 void wxDataFormat::SetType( wxDataFormatId type )
  77 {
  78     PrepareFormats();
  79
  80     if (type == wxDF_UNICODETEXT)
  81        type = wxDF_TEXT;
  82
  83     m_type = type;
  84
  85     if (m_type == wxDF_TEXT)
  86         m_format = g_textAtom;
  87     else
  88     if (m_type == wxDF_BITMAP)
  89         m_format = g_pngAtom;
  90     else
  91     if (m_type == wxDF_FILENAME)
  92         m_format = g_fileAtom;
  93     else
  94     {
  95        wxFAIL_MSG( wxT("invalid dataformat") );
  96     }
  97 }
  98
  99 wxDataFormatId wxDataFormat::GetType() const
 100 {
 101     return m_type;
 102 }
 103
 104 wxString wxDataFormat::GetId() const
 105 {
 106     wxString ret = wxString::FromAscii( gdk_atom_name( m_format ) );
 107     return ret;
 108 }
 109
 110 void wxDataFormat::SetId( NativeFormat format )
 111 {
 112     PrepareFormats();
 113     m_format = format;
 114
 115     if (m_format == g_textAtom)
 116         m_type = wxDF_TEXT;
 117     else
 118     if (m_format == g_pngAtom)
 119         m_type = wxDF_BITMAP;
 120     else
 121     if (m_format == g_fileAtom)
 122         m_type = wxDF_FILENAME;
 123     else
 124         m_type = wxDF_PRIVATE;
 125 }
 126
 127 void wxDataFormat::SetId( const wxChar *id )
 128 {
 129     PrepareFormats();
 130     m_type = wxDF_PRIVATE;
 131     wxString tmp( id );
 132     m_format = gdk_atom_intern( (const char*) tmp.ToAscii(), FALSE );
 133 }
 134
 135 void wxDataFormat::PrepareFormats()
 136 {
 137     // VZ: GNOME included in RedHat 6.1 uses the MIME types below and not the
 138     //     atoms STRING and file:ALL as the old code was, but normal X apps
 139     //     use STRING for text selection when transfering the data via
 140     //     clipboard, for example, so do use STRING for now (GNOME apps will
 141     //     probably support STRING as well for compatibility anyhow), but use
 142     //     text/uri-list for file dnd because compatibility is not important
 143     //     here (with whom?)
 144     if (!g_textAtom)
 145 #if wxUSE_UNICODE
 146         g_textAtom = gdk_atom_intern( "UTF8_STRING", FALSE );
 147 #else
 148         g_textAtom = gdk_atom_intern( "STRING" /* "text/plain" */, FALSE );
 149 #endif
 150     if (!g_pngAtom)
 151         g_pngAtom = gdk_atom_intern( "image/png", FALSE );
 152     if (!g_fileAtom)
 153         g_fileAtom = gdk_atom_intern( "text/uri-list", FALSE );
 154 }
 155
 156 //-------------------------------------------------------------------------
 157 // wxDataObject
 158 //-------------------------------------------------------------------------
 159
 160 wxDataObject::wxDataObject()
 161 {
 162 }
 163
 164 wxDataObject::~wxDataObject()
 165 {
 166     // dtor is empty but needed for Darwin and AIX -- otherwise it doesn't link
 167 }
 168
 169 bool wxDataObject::IsSupportedFormat(const wxDataFormat& format, Direction dir) const
 170 {
 171     size_t nFormatCount = GetFormatCount(dir);
 172     if ( nFormatCount == 1 )
 173     {
 174         return format == GetPreferredFormat();
 175     }
 176     else
 177     {
 178         wxDataFormat *formats = new wxDataFormat[nFormatCount];
 179         GetAllFormats(formats,dir);
 180
 181         size_t n;
 182         for ( n = 0; n < nFormatCount; n++ )
 183         {
 184             if ( formats[n] == format )
 185                 break;
 186         }
 187
 188         delete [] formats;
 189
 190         // found?
 191         return n < nFormatCount;
 192     }
 193 }
 194
 195 // ----------------------------------------------------------------------------
 196 // wxFileDataObject
 197 // ----------------------------------------------------------------------------
 198
 199 bool wxFileDataObject::GetDataHere(void *buf) const
 200 {
 201     wxString filenames;
 202
 203     for (size_t i = 0; i < m_filenames.GetCount(); i++)
 204     {
 205         filenames += wxT("file:");
 206         filenames += m_filenames[i];
 207         filenames += wxT("\r\n");
 208     }
 209
 210     memcpy( buf, filenames.mbc_str(), filenames.Len() + 1 );
 211
 212     return TRUE;
 213 }
 214
 215 size_t wxFileDataObject::GetDataSize() const
 216 {
 217     size_t res = 0;
 218
 219     for (size_t i = 0; i < m_filenames.GetCount(); i++)
 220     {
 221         // This is junk in UTF-8
 222         res += m_filenames[i].Len();
 223         res += 5 + 2; // "file:" (5) + "\r\n" (2)
 224     }
 225
 226     return res + 1;
 227 }
 228
 229 bool wxFileDataObject::SetData(size_t WXUNUSED(size), const void *buf)
 230 {
 231     // VZ: old format
 232 #if 0
 233     // filenames are stores as a string with #0 as deliminators
 234     const char *filenames = (const char*) buf;
 235     size_t pos = 0;
 236     for(;;)
 237     {
 238         if (filenames[0] == 0)
 239             break;
 240         if (pos >= size)
 241             break;
 242         wxString file( filenames );  // this returns the first file
 243         AddFile( file );
 244         pos += file.Len()+1;
 245         filenames += file.Len()+1;
 246     }
 247 #else // 1
 248     m_filenames.Empty();
 249
 250     // the text/uri-list format is a sequence of URIs (filenames prefixed by
 251     // "file:" as far as I see) delimited by "\r\n" of total length size
 252     // (I wonder what happens if the file has '\n' in its filename??)
 253     wxString filename;
 254     for ( const char *p = (const char *)buf; ; p++ )
 255     {
 256         // some broken programs (testdnd GTK+ sample!) omit the trailing
 257         // "\r\n", so check for '\0' explicitly here instead of doing it in
 258         // the loop statement to account for it
 259         if ( (*p == '\r' && *(p+1) == '\n') || !*p )
 260         {
 261             size_t lenPrefix = 5; // strlen("file:")
 262             if ( filename.Left(lenPrefix).MakeLower() == _T("file:") )
 263             {
 264                 // sometimes the syntax is "file:filename", sometimes it's
 265                 // URL-like: "file://filename" - deal with both
 266                 if ( filename[lenPrefix] == _T('/') &&
 267                      filename[lenPrefix + 1] == _T('/') )
 268                 {
 269                     // skip the slashes
 270                     lenPrefix += 2;
 271                 }
 272
 273                 AddFile(filename.c_str() + lenPrefix);
 274                 filename.Empty();
 275             }
 276             else
 277             {
 278                 wxLogDebug(_T("Unsupported URI '%s' in wxFileDataObject"),
 279                            filename.c_str());
 280             }
 281
 282             if ( !*p )
 283                 break;
 284
 285             // skip '\r'
 286             p++;
 287         }
 288         else
 289         {
 290             filename += *p;
 291         }
 292     }
 293 #endif // 0/1
 294
 295     return TRUE;
 296 }
 297
 298 void wxFileDataObject::AddFile( const wxString &filename )
 299 {
 300    m_filenames.Add( filename );
 301 }
 302
 303 // ----------------------------------------------------------------------------
 304 // wxBitmapDataObject
 305 // ----------------------------------------------------------------------------
 306
 307 wxBitmapDataObject::wxBitmapDataObject()
 308 {
 309     Init();
 310 }
 311
 312 wxBitmapDataObject::wxBitmapDataObject( const wxBitmap& bitmap )
 313                   : wxBitmapDataObjectBase(bitmap)
 314 {
 315     Init();
 316
 317     DoConvertToPng();
 318 }
 319
 320 wxBitmapDataObject::~wxBitmapDataObject()
 321 {
 322     Clear();
 323 }
 324
 325 void wxBitmapDataObject::SetBitmap( const wxBitmap &bitmap )
 326 {
 327     ClearAll();
 328
 329     wxBitmapDataObjectBase::SetBitmap(bitmap);
 330
 331     DoConvertToPng();
 332 }
 333
 334 bool wxBitmapDataObject::GetDataHere(void *buf) const
 335 {
 336     if ( !m_pngSize )
 337     {
 338         wxFAIL_MSG( wxT("attempt to copy empty bitmap failed") );
 339
 340         return FALSE;
 341     }
 342
 343     memcpy(buf, m_pngData, m_pngSize);
 344
 345     return TRUE;
 346 }
 347
 348 bool wxBitmapDataObject::SetData(size_t size, const void *buf)
 349 {
 350     Clear();
 351
 352     wxCHECK_MSG( wxImage::FindHandler(wxBITMAP_TYPE_PNG) != NULL,
 353                  FALSE, wxT("You must call wxImage::AddHandler(new wxPNGHandler); to be able to use clipboard with bitmaps!") );
 354
 355     m_pngSize = size;
 356     m_pngData = malloc(m_pngSize);
 357
 358     memcpy(m_pngData, buf, m_pngSize);
 359
 360     wxMemoryInputStream mstream((char*) m_pngData, m_pngSize);
 361     wxImage image;
 362     if ( !image.LoadFile( mstream, wxBITMAP_TYPE_PNG ) )
 363     {
 364         return FALSE;
 365     }
 366
 367     m_bitmap = wxBitmap(image);
 368
 369     return m_bitmap.Ok();
 370 }
 371
 372 void wxBitmapDataObject::DoConvertToPng()
 373 {
 374     if ( !m_bitmap.Ok() )
 375         return;
 376
 377     wxCHECK_RET( wxImage::FindHandler(wxBITMAP_TYPE_PNG) != NULL,
 378                  wxT("You must call wxImage::AddHandler(new wxPNGHandler); to be able to use clipboard with bitmaps!") );
 379
 380     wxImage image = m_bitmap.ConvertToImage();
 381
 382     wxCountingOutputStream count;
 383     image.SaveFile(count, wxBITMAP_TYPE_PNG);
 384
 385     m_pngSize = count.GetSize() + 100; // sometimes the size seems to vary ???
 386     m_pngData = malloc(m_pngSize);
 387
 388     wxMemoryOutputStream mstream((char*) m_pngData, m_pngSize);
 389     image.SaveFile(mstream, wxBITMAP_TYPE_PNG);
 390 }
 391
 392