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
 209 wxTextDataObject::GetAllFormats(wxDataFormat *formats,
 210                                 wxDataObjectBase::Direction WXUNUSED(dir)) const
 211 {
 212     *formats++ = GetPreferredFormat();
 213     *formats = g_altTextAtom;
 214 }
 215 #endif
 216
 217 // ----------------------------------------------------------------------------
 218 // wxFileDataObject
 219 // ----------------------------------------------------------------------------
 220
 221 bool wxFileDataObject::GetDataHere(void *buf) const
 222 {
 223     wxString filenames;
 224
 225     for (size_t i = 0; i < m_filenames.GetCount(); i++)
 226     {
 227         filenames += wxT("file:");
 228         filenames += m_filenames[i];
 229         filenames += wxT("\r\n");
 230     }
 231
 232     memcpy( buf, filenames.mbc_str(), filenames.length() + 1 );
 233
 234     return true;
 235 }
 236
 237 size_t wxFileDataObject::GetDataSize() const
 238 {
 239     size_t res = 0;
 240
 241     for (size_t i = 0; i < m_filenames.GetCount(); i++)
 242     {
 243         // This is junk in UTF-8
 244         res += m_filenames[i].length();
 245         res += 5 + 2; // "file:" (5) + "\r\n" (2)
 246     }
 247
 248     return res + 1;
 249 }
 250
 251 bool wxFileDataObject::SetData(size_t WXUNUSED(size), const void *buf)
 252 {
 253     // we get data in the text/uri-list format, i.e. as a sequence of URIs
 254     // (filenames prefixed by "file:") delimited by "\r\n". size includes
 255     // the trailing zero (in theory, not for Nautilus in early GNOME
 256     // versions).
 257
 258     m_filenames.Empty();
 259
 260     const gchar *nexttemp = (const gchar*) buf;
 261     for ( ; ; )
 262     {
 263         int len = 0;
 264         const gchar *temp = nexttemp;
 265         for (;;)
 266         {
 267             if (temp[len] == 0)
 268             {
 269                 if (len > 0)
 270                 {
 271                     // if an app omits '\r''\n'
 272                     nexttemp = temp+len;
 273                     break;
 274                 }
 275
 276                 return true;
 277             }
 278             if (temp[len] == '\r')
 279             {
 280                 if (temp[len+1] == '\n')
 281                     nexttemp = temp+len+2;
 282                 else
 283                     nexttemp = temp+len+1;
 284                 break;
 285             }
 286             len++;
 287         }
 288
 289         if (len == 0)
 290             break;
 291
 292         // required to give it a trailing zero
 293         gchar *uri = g_strndup( temp, len );
 294
 295         gchar *fn = g_filename_from_uri( uri, NULL, NULL );
 296
 297         g_free( uri );
 298
 299         if (fn)
 300         {
 301             AddFile( wxConvFileName->cMB2WX( fn ) );
 302             g_free( fn );
 303         }
 304     }
 305
 306     return true;
 307 }
 308
 309 void wxFileDataObject::AddFile( const wxString &filename )
 310 {
 311    m_filenames.Add( filename );
 312 }
 313
 314 // ----------------------------------------------------------------------------
 315 // wxBitmapDataObject
 316 // ----------------------------------------------------------------------------
 317
 318 wxBitmapDataObject::wxBitmapDataObject()
 319 {
 320     Init();
 321 }
 322
 323 wxBitmapDataObject::wxBitmapDataObject( const wxBitmap& bitmap )
 324                   : wxBitmapDataObjectBase(bitmap)
 325 {
 326     Init();
 327
 328     DoConvertToPng();
 329 }
 330
 331 wxBitmapDataObject::~wxBitmapDataObject()
 332 {
 333     Clear();
 334 }
 335
 336 void wxBitmapDataObject::SetBitmap( const wxBitmap &bitmap )
 337 {
 338     ClearAll();
 339
 340     wxBitmapDataObjectBase::SetBitmap(bitmap);
 341
 342     DoConvertToPng();
 343 }
 344
 345 bool wxBitmapDataObject::GetDataHere(void *buf) const
 346 {
 347     if ( !m_pngSize )
 348     {
 349         wxFAIL_MSG( wxT("attempt to copy empty bitmap failed") );
 350
 351         return false;
 352     }
 353
 354     memcpy(buf, m_pngData, m_pngSize);
 355
 356     return true;
 357 }
 358
 359 bool wxBitmapDataObject::SetData(size_t size, const void *buf)
 360 {
 361     Clear();
 362
 363     wxCHECK_MSG( wxImage::FindHandler(wxBITMAP_TYPE_PNG) != NULL,
 364                  false, wxT("You must call wxImage::AddHandler(new wxPNGHandler); to be able to use clipboard with bitmaps!") );
 365
 366     m_pngSize = size;
 367     m_pngData = malloc(m_pngSize);
 368
 369     memcpy(m_pngData, buf, m_pngSize);
 370
 371     wxMemoryInputStream mstream((char*) m_pngData, m_pngSize);
 372     wxImage image;
 373     if ( !image.LoadFile( mstream, wxBITMAP_TYPE_PNG ) )
 374     {
 375         return false;
 376     }
 377
 378     m_bitmap = wxBitmap(image);
 379
 380     return m_bitmap.Ok();
 381 }
 382
 383 void wxBitmapDataObject::DoConvertToPng()
 384 {
 385     if ( !m_bitmap.Ok() )
 386         return;
 387
 388     wxCHECK_RET( wxImage::FindHandler(wxBITMAP_TYPE_PNG) != NULL,
 389                  wxT("You must call wxImage::AddHandler(new wxPNGHandler); to be able to use clipboard with bitmaps!") );
 390
 391     wxImage image = m_bitmap.ConvertToImage();
 392
 393     wxCountingOutputStream count;
 394     image.SaveFile(count, wxBITMAP_TYPE_PNG);
 395
 396     m_pngSize = count.GetSize() + 100; // sometimes the size seems to vary ???
 397     m_pngData = malloc(m_pngSize);
 398
 399     wxMemoryOutputStream mstream((char*) m_pngData, m_pngSize);
 400     image.SaveFile(mstream, wxBITMAP_TYPE_PNG);
 401 }
 402
 403 #endif // wxUSE_DATAOBJ