src/gtk/dataobj.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/gtk/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 // 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/image.h"
  21 #endif
  22
  23 #include "wx/mstream.h"
  24 #include "wx/uri.h"
  25
  26 #include "wx/gtk/private.h"
  27
  28 //-------------------------------------------------------------------------
  29 // global data
  30 //-------------------------------------------------------------------------
  31
  32 GdkAtom  g_textAtom        = 0;
  33 GdkAtom  g_altTextAtom     = 0;
  34 GdkAtom  g_pngAtom         = 0;
  35 GdkAtom  g_fileAtom        = 0;
  36
  37 //-------------------------------------------------------------------------
  38 // wxDataFormat
  39 //-------------------------------------------------------------------------
  40
  41 wxDataFormat::wxDataFormat()
  42 {
  43     // do *not* call PrepareFormats() from here for 2 reasons:
  44     //
  45     // 1. we will have time to do it later because some other Set function
  46     //    must be called before we really need them
  47     //
  48     // 2. doing so prevents us from declaring global wxDataFormats because
  49     //    calling PrepareFormats (and thus gdk_atom_intern) before GDK is
  50     //    initialised will result in a crash
  51     m_type = wxDF_INVALID;
  52     m_format = (GdkAtom) 0;
  53 }
  54
  55 wxDataFormat::wxDataFormat( wxDataFormatId type )
  56 {
  57     PrepareFormats();
  58     SetType( type );
  59 }
  60
  61 void wxDataFormat::InitFromString( 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     m_type = type;
  78
  79 #if wxUSE_UNICODE
  80     if (m_type == wxDF_UNICODETEXT)
  81         m_format = g_textAtom;
  82     else if (m_type == wxDF_TEXT)
  83         m_format = g_altTextAtom;
  84 #else
  85     if (m_type == wxDF_TEXT || m_type == wxDF_UNICODETEXT)
  86         m_format = g_textAtom;
  87 #endif
  88     else
  89     if (m_type == wxDF_BITMAP)
  90         m_format = g_pngAtom;
  91     else
  92     if (m_type == wxDF_FILENAME)
  93         m_format = g_fileAtom;
  94     else
  95     {
  96        wxFAIL_MSG( wxT("invalid dataformat") );
  97     }
  98 }
  99
 100 wxDataFormatId wxDataFormat::GetType() const
 101 {
 102     return m_type;
 103 }
 104
 105 wxString wxDataFormat::GetId() const
 106 {
 107     wxGtkString atom_name(gdk_atom_name(m_format));
 108     return wxString::FromAscii(atom_name);
 109 }
 110
 111 void wxDataFormat::SetId( NativeFormat format )
 112 {
 113     PrepareFormats();
 114     m_format = format;
 115
 116     if (m_format == g_textAtom)
 117 #if wxUSE_UNICODE
 118         m_type = wxDF_UNICODETEXT;
 119 #else
 120         m_type = wxDF_TEXT;
 121 #endif
 122     else
 123     if (m_format == g_altTextAtom)
 124         m_type = wxDF_TEXT;
 125     else
 126     if (m_format == g_pngAtom)
 127         m_type = wxDF_BITMAP;
 128     else
 129     if (m_format == g_fileAtom)
 130         m_type = wxDF_FILENAME;
 131     else
 132         m_type = wxDF_PRIVATE;
 133 }
 134
 135 void wxDataFormat::SetId( const wxString& id )
 136 {
 137     PrepareFormats();
 138     m_type = wxDF_PRIVATE;
 139     m_format = gdk_atom_intern( id.ToAscii(), FALSE );
 140 }
 141
 142 void wxDataFormat::PrepareFormats()
 143 {
 144     // VZ: GNOME included in RedHat 6.1 uses the MIME types below and not the
 145     //     atoms STRING and file:ALL as the old code was, but normal X apps
 146     //     use STRING for text selection when transfering the data via
 147     //     clipboard, for example, so do use STRING for now (GNOME apps will
 148     //     probably support STRING as well for compatibility anyhow), but use
 149     //     text/uri-list for file dnd because compatibility is not important
 150     //     here (with whom?)
 151     if (!g_textAtom)
 152 #if wxUSE_UNICODE
 153         g_textAtom = gdk_atom_intern( "UTF8_STRING", FALSE );
 154         g_altTextAtom = gdk_atom_intern( "STRING", FALSE );
 155 #else
 156         g_textAtom = gdk_atom_intern( "STRING" /* "text/plain" */, FALSE );
 157 #endif
 158     if (!g_pngAtom)
 159         g_pngAtom = gdk_atom_intern( "image/png", FALSE );
 160     if (!g_fileAtom)
 161         g_fileAtom = gdk_atom_intern( "text/uri-list", FALSE );
 162 }
 163
 164 //-------------------------------------------------------------------------
 165 // wxDataObject
 166 //-------------------------------------------------------------------------
 167
 168 wxDataObject::wxDataObject()
 169 {
 170 }
 171
 172 wxDataObject::~wxDataObject()
 173 {
 174     // dtor is empty but needed for Darwin and AIX -- otherwise it doesn't link
 175 }
 176
 177 bool wxDataObject::IsSupportedFormat(const wxDataFormat& format, Direction dir) const
 178 {
 179     size_t nFormatCount = GetFormatCount(dir);
 180     if ( nFormatCount == 1 )
 181     {
 182         return format == GetPreferredFormat();
 183     }
 184     else
 185     {
 186         wxDataFormat *formats = new wxDataFormat[nFormatCount];
 187         GetAllFormats(formats,dir);
 188
 189         size_t n;
 190         for ( n = 0; n < nFormatCount; n++ )
 191         {
 192             if ( formats[n] == format )
 193                 break;
 194         }
 195
 196         delete [] formats;
 197
 198         // found?
 199         return n < nFormatCount;
 200     }
 201 }
 202
 203 // ----------------------------------------------------------------------------
 204 // wxTextDataObject
 205 // ----------------------------------------------------------------------------
 206
 207 #if defined(__WXGTK20__) && wxUSE_UNICODE
 208 void wxTextDataObject::GetAllFormats(wxDataFormat *formats, wxDataObjectBase::Direction dir) const
 209 {
 210     *formats++ = GetPreferredFormat();
 211     *formats = g_altTextAtom;
 212 }
 213 #endif
 214
 215 // ----------------------------------------------------------------------------
 216 // wxFileDataObject
 217 // ----------------------------------------------------------------------------
 218
 219 bool wxFileDataObject::GetDataHere(void *buf) const
 220 {
 221     wxString filenames;
 222
 223     for (size_t i = 0; i < m_filenames.GetCount(); i++)
 224     {
 225         filenames += wxT("file:");
 226         filenames += m_filenames[i];
 227         filenames += wxT("\r\n");
 228     }
 229
 230     memcpy( buf, filenames.mbc_str(), filenames.length() + 1 );
 231
 232     return true;
 233 }
 234
 235 size_t wxFileDataObject::GetDataSize() const
 236 {
 237     size_t res = 0;
 238
 239     for (size_t i = 0; i < m_filenames.GetCount(); i++)
 240     {
 241         // This is junk in UTF-8
 242         res += m_filenames[i].length();
 243         res += 5 + 2; // "file:" (5) + "\r\n" (2)
 244     }
 245
 246     return res + 1;
 247 }
 248
 249 bool wxFileDataObject::SetData(size_t WXUNUSED(size), const void *buf)
 250 {
 251     // we get data in the text/uri-list format, i.e. as a sequence of URIs
 252     // (filenames prefixed by "file:") delimited by "\r\n". size includes
 253     // the trailing zero (in theory, not for Nautilus in early GNOME
 254     // versions).
 255
 256     m_filenames.Empty();
 257
 258     const gchar *nexttemp = (const gchar*) buf;
 259     for ( ; ; )
 260     {
 261         int len = 0;
 262         const gchar *temp = nexttemp;
 263         for (;;)
 264         {
 265             if (temp[len] == 0)
 266             {
 267                 if (len > 0)
 268                 {
 269                     // if an app omits '\r''\n'
 270                     nexttemp = temp+len;
 271                     break;
 272                 }
 273
 274                 return true;
 275             }
 276             if (temp[len] == '\r')
 277             {
 278                 if (temp[len+1] == '\n')
 279                     nexttemp = temp+len+2;
 280                 else
 281                     nexttemp = temp+len+1;
 282                 break;
 283             }
 284             len++;
 285         }
 286
 287         if (len == 0)
 288             break;
 289
 290         // required to give it a trailing zero
 291         gchar *uri = g_strndup( temp, len );
 292
 293         gchar *fn = g_filename_from_uri( uri, NULL, NULL );
 294
 295         g_free( uri );
 296
 297         if (fn)
 298         {
 299             AddFile( wxConvFileName->cMB2WX( fn ) );
 300             g_free( fn );
 301         }
 302     }
 303
 304     return true;
 305 }
 306
 307 void wxFileDataObject::AddFile( const wxString &filename )
 308 {
 309    m_filenames.Add( filename );
 310 }
 311
 312 // ----------------------------------------------------------------------------
 313 // wxBitmapDataObject
 314 // ----------------------------------------------------------------------------
 315
 316 wxBitmapDataObject::wxBitmapDataObject()
 317 {
 318     Init();
 319 }
 320
 321 wxBitmapDataObject::wxBitmapDataObject( const wxBitmap& bitmap )
 322                   : wxBitmapDataObjectBase(bitmap)
 323 {
 324     Init();
 325
 326     DoConvertToPng();
 327 }
 328
 329 wxBitmapDataObject::~wxBitmapDataObject()
 330 {
 331     Clear();
 332 }
 333
 334 void wxBitmapDataObject::SetBitmap( const wxBitmap &bitmap )
 335 {
 336     ClearAll();
 337
 338     wxBitmapDataObjectBase::SetBitmap(bitmap);
 339
 340     DoConvertToPng();
 341 }
 342
 343 bool wxBitmapDataObject::GetDataHere(void *buf) const
 344 {
 345     if ( !m_pngSize )
 346     {
 347         wxFAIL_MSG( wxT("attempt to copy empty bitmap failed") );
 348
 349         return false;
 350     }
 351
 352     memcpy(buf, m_pngData, m_pngSize);
 353
 354     return true;
 355 }
 356
 357 bool wxBitmapDataObject::SetData(size_t size, const void *buf)
 358 {
 359     Clear();
 360
 361     wxCHECK_MSG( wxImage::FindHandler(wxBITMAP_TYPE_PNG) != NULL,
 362                  false, wxT("You must call wxImage::AddHandler(new wxPNGHandler); to be able to use clipboard with bitmaps!") );
 363
 364     m_pngSize = size;
 365     m_pngData = malloc(m_pngSize);
 366
 367     memcpy(m_pngData, buf, m_pngSize);
 368
 369     wxMemoryInputStream mstream((char*) m_pngData, m_pngSize);
 370     wxImage image;
 371     if ( !image.LoadFile( mstream, wxBITMAP_TYPE_PNG ) )
 372     {
 373         return false;
 374     }
 375
 376     m_bitmap = wxBitmap(image);
 377
 378     return m_bitmap.Ok();
 379 }
 380
 381 void wxBitmapDataObject::DoConvertToPng()
 382 {
 383     if ( !m_bitmap.Ok() )
 384         return;
 385
 386     wxCHECK_RET( wxImage::FindHandler(wxBITMAP_TYPE_PNG) != NULL,
 387                  wxT("You must call wxImage::AddHandler(new wxPNGHandler); to be able to use clipboard with bitmaps!") );
 388
 389     wxImage image = m_bitmap.ConvertToImage();
 390
 391     wxCountingOutputStream count;
 392     image.SaveFile(count, wxBITMAP_TYPE_PNG);
 393
 394     m_pngSize = count.GetSize() + 100; // sometimes the size seems to vary ???
 395     m_pngData = malloc(m_pngSize);
 396
 397     wxMemoryOutputStream mstream((char*) m_pngData, m_pngSize);
 398     image.SaveFile(mstream, wxBITMAP_TYPE_PNG);
 399 }
 400
 401 #endif // wxUSE_DATAOBJ