src/gtk1/dataobj.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/gtk1/dataobj.cpp
   3 // Purpose:     wxDataObject class
   4 // Author:      Robert Roebling
   5 // Copyright:   (c) 1998 Robert Roebling
   6 // Licence:     wxWindows licence
   7 ///////////////////////////////////////////////////////////////////////////////
   8
   9 // For compilers that support precompilation, includes "wx.h".
  10 #include "wx/wxprec.h"
  11
  12 #if wxUSE_DATAOBJ
  13
  14 #include "wx/dataobj.h"
  15
  16 #ifndef WX_PRECOMP
  17     #include "wx/log.h"
  18     #include "wx/app.h"
  19     #include "wx/image.h"
  20 #endif
  21
  22 #include "wx/mstream.h"
  23 #include "wx/uri.h"
  24
  25 #include <gdk/gdk.h>
  26
  27 //-------------------------------------------------------------------------
  28 // global data
  29 //-------------------------------------------------------------------------
  30
  31 GdkAtom  g_textAtom        = 0;
  32 GdkAtom  g_altTextAtom     = 0;
  33 GdkAtom  g_pngAtom         = 0;
  34 GdkAtom  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 = (GdkAtom) 0;
  52 }
  53
  54 wxDataFormat::wxDataFormat( wxDataFormatId type )
  55 {
  56     PrepareFormats();
  57     SetType( type );
  58 }
  59
  60 void wxDataFormat::InitFromString( 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
  76     m_type = type;
  77
  78 #if wxUSE_UNICODE
  79     if (m_type == wxDF_UNICODETEXT)
  80         m_format = g_textAtom;
  81     else if (m_type == wxDF_TEXT)
  82         m_format = g_altTextAtom;
  83 #else
  84     if (m_type == wxDF_TEXT || m_type == wxDF_UNICODETEXT)
  85         m_format = g_textAtom;
  86 #endif
  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     gchar* atom_name = gdk_atom_name( m_format );
 107     wxString ret = wxString::FromAscii( atom_name );
 108     g_free(atom_name);
 109     return ret;
 110 }
 111
 112 void wxDataFormat::SetId( NativeFormat format )
 113 {
 114     PrepareFormats();
 115     m_format = format;
 116
 117     if (m_format == g_textAtom)
 118 #if wxUSE_UNICODE
 119         m_type = wxDF_UNICODETEXT;
 120 #else
 121         m_type = wxDF_TEXT;
 122 #endif
 123     else
 124     if (m_format == g_altTextAtom)
 125         m_type = wxDF_TEXT;
 126     else
 127     if (m_format == g_pngAtom)
 128         m_type = wxDF_BITMAP;
 129     else
 130     if (m_format == g_fileAtom)
 131         m_type = wxDF_FILENAME;
 132     else
 133         m_type = wxDF_PRIVATE;
 134 }
 135
 136 void wxDataFormat::SetId( const wxString& id )
 137 {
 138     PrepareFormats();
 139     m_type = wxDF_PRIVATE;
 140     m_format = gdk_atom_intern( id.ToAscii(), FALSE );
 141 }
 142
 143 void wxDataFormat::PrepareFormats()
 144 {
 145     // VZ: GNOME included in RedHat 6.1 uses the MIME types below and not the
 146     //     atoms STRING and file:ALL as the old code was, but normal X apps
 147     //     use STRING for text selection when transfering the data via
 148     //     clipboard, for example, so do use STRING for now (GNOME apps will
 149     //     probably support STRING as well for compatibility anyhow), but use
 150     //     text/uri-list for file dnd because compatibility is not important
 151     //     here (with whom?)
 152     if (!g_textAtom)
 153 #if wxUSE_UNICODE
 154         g_textAtom = gdk_atom_intern( "UTF8_STRING", FALSE );
 155         g_altTextAtom = gdk_atom_intern( "STRING", FALSE );
 156 #else
 157         g_textAtom = gdk_atom_intern( "STRING" /* "text/plain" */, FALSE );
 158 #endif
 159     if (!g_pngAtom)
 160         g_pngAtom = gdk_atom_intern( "image/png", FALSE );
 161     if (!g_fileAtom)
 162         g_fileAtom = gdk_atom_intern( "text/uri-list", FALSE );
 163 }
 164
 165 //-------------------------------------------------------------------------
 166 // wxDataObject
 167 //-------------------------------------------------------------------------
 168
 169 wxDataObject::wxDataObject()
 170 {
 171 }
 172
 173 wxDataObject::~wxDataObject()
 174 {
 175     // dtor is empty but needed for Darwin and AIX -- otherwise it doesn't link
 176 }
 177
 178 bool wxDataObject::IsSupportedFormat(const wxDataFormat& format, Direction dir) const
 179 {
 180     size_t nFormatCount = GetFormatCount(dir);
 181     if ( nFormatCount == 1 )
 182     {
 183         return format == GetPreferredFormat();
 184     }
 185     else
 186     {
 187         wxDataFormat *formats = new wxDataFormat[nFormatCount];
 188         GetAllFormats(formats,dir);
 189
 190         size_t n;
 191         for ( n = 0; n < nFormatCount; n++ )
 192         {
 193             if ( formats[n] == format )
 194                 break;
 195         }
 196
 197         delete [] formats;
 198
 199         // found?
 200         return n < nFormatCount;
 201     }
 202 }
 203
 204 // ----------------------------------------------------------------------------
 205 // wxFileDataObject
 206 // ----------------------------------------------------------------------------
 207
 208 bool wxFileDataObject::GetDataHere(void *buf) const
 209 {
 210     wxString filenames;
 211
 212     for (size_t i = 0; i < m_filenames.GetCount(); i++)
 213     {
 214         filenames += wxT("file:");
 215         filenames += m_filenames[i];
 216         filenames += wxT("\r\n");
 217     }
 218
 219     memcpy( buf, filenames.mbc_str(), filenames.length() + 1 );
 220
 221     return true;
 222 }
 223
 224 size_t wxFileDataObject::GetDataSize() const
 225 {
 226     size_t res = 0;
 227
 228     for (size_t i = 0; i < m_filenames.GetCount(); i++)
 229     {
 230         // This is junk in UTF-8
 231         res += m_filenames[i].length();
 232         res += 5 + 2; // "file:" (5) + "\r\n" (2)
 233     }
 234
 235     return res + 1;
 236 }
 237
 238 bool wxFileDataObject::SetData(size_t WXUNUSED(size), const void *buf)
 239 {
 240     m_filenames.Empty();
 241
 242     // we get data in the text/uri-list format, i.e. as a sequence of URIs
 243     // (filenames prefixed by "file:") delimited by "\r\n"
 244     wxString filename;
 245     for ( const char *p = (const char *)buf; ; p++ )
 246     {
 247         // some broken programs (testdnd GTK+ sample!) omit the trailing
 248         // "\r\n", so check for '\0' explicitly here instead of doing it in
 249         // the loop statement to account for it
 250         if ( (*p == '\r' && *(p+1) == '\n') || !*p )
 251         {
 252             size_t lenPrefix = 5; // strlen("file:")
 253             if ( filename.Left(lenPrefix).MakeLower() == wxT("file:") )
 254             {
 255                 // sometimes the syntax is "file:filename", sometimes it's
 256                 // URL-like: "file://filename" - deal with both
 257                 if ( filename[lenPrefix] == wxT('/') &&
 258                      filename[lenPrefix + 1] == wxT('/') )
 259                 {
 260                     // skip the slashes
 261                     lenPrefix += 2;
 262                 }
 263
 264                 AddFile(wxURI::Unescape(filename.c_str() + lenPrefix));
 265                 filename.Empty();
 266             }
 267             else
 268             {
 269                 wxLogDebug(wxT("Unsupported URI '%s' in wxFileDataObject"),
 270                            filename.c_str());
 271             }
 272
 273             if ( !*p )
 274                 break;
 275
 276             // skip '\r'
 277             p++;
 278         }
 279         else
 280         {
 281             filename += *p;
 282         }
 283     }
 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.IsOk();
 360 }
 361
 362 void wxBitmapDataObject::DoConvertToPng()
 363 {
 364     if ( !m_bitmap.IsOk() )
 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 #endif // wxUSE_DATAOBJ