src/gtk1/dataobj.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/gtk1/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 <gdk/gdk.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     gchar* atom_name = gdk_atom_name( m_format );
 108     wxString ret = wxString::FromAscii( atom_name );
 109     g_free(atom_name);
 110     return ret;
 111 }
 112
 113 void wxDataFormat::SetId( NativeFormat format )
 114 {
 115     PrepareFormats();
 116     m_format = format;
 117
 118     if (m_format == g_textAtom)
 119 #if wxUSE_UNICODE
 120         m_type = wxDF_UNICODETEXT;
 121 #else
 122         m_type = wxDF_TEXT;
 123 #endif
 124     else
 125     if (m_format == g_altTextAtom)
 126         m_type = wxDF_TEXT;
 127     else
 128     if (m_format == g_pngAtom)
 129         m_type = wxDF_BITMAP;
 130     else
 131     if (m_format == g_fileAtom)
 132         m_type = wxDF_FILENAME;
 133     else
 134         m_type = wxDF_PRIVATE;
 135 }
 136
 137 void wxDataFormat::SetId( const wxString& id )
 138 {
 139     PrepareFormats();
 140     m_type = wxDF_PRIVATE;
 141     m_format = gdk_atom_intern( id.ToAscii(), FALSE );
 142 }
 143
 144 void wxDataFormat::PrepareFormats()
 145 {
 146     // VZ: GNOME included in RedHat 6.1 uses the MIME types below and not the
 147     //     atoms STRING and file:ALL as the old code was, but normal X apps
 148     //     use STRING for text selection when transfering the data via
 149     //     clipboard, for example, so do use STRING for now (GNOME apps will
 150     //     probably support STRING as well for compatibility anyhow), but use
 151     //     text/uri-list for file dnd because compatibility is not important
 152     //     here (with whom?)
 153     if (!g_textAtom)
 154 #if wxUSE_UNICODE
 155         g_textAtom = gdk_atom_intern( "UTF8_STRING", FALSE );
 156         g_altTextAtom = gdk_atom_intern( "STRING", FALSE );
 157 #else
 158         g_textAtom = gdk_atom_intern( "STRING" /* "text/plain" */, FALSE );
 159 #endif
 160     if (!g_pngAtom)
 161         g_pngAtom = gdk_atom_intern( "image/png", FALSE );
 162     if (!g_fileAtom)
 163         g_fileAtom = gdk_atom_intern( "text/uri-list", FALSE );
 164 }
 165
 166 //-------------------------------------------------------------------------
 167 // wxDataObject
 168 //-------------------------------------------------------------------------
 169
 170 wxDataObject::wxDataObject()
 171 {
 172 }
 173
 174 wxDataObject::~wxDataObject()
 175 {
 176     // dtor is empty but needed for Darwin and AIX -- otherwise it doesn't link
 177 }
 178
 179 bool wxDataObject::IsSupportedFormat(const wxDataFormat& format, Direction dir) const
 180 {
 181     size_t nFormatCount = GetFormatCount(dir);
 182     if ( nFormatCount == 1 )
 183     {
 184         return format == GetPreferredFormat();
 185     }
 186     else
 187     {
 188         wxDataFormat *formats = new wxDataFormat[nFormatCount];
 189         GetAllFormats(formats,dir);
 190
 191         size_t n;
 192         for ( n = 0; n < nFormatCount; n++ )
 193         {
 194             if ( formats[n] == format )
 195                 break;
 196         }
 197
 198         delete [] formats;
 199
 200         // found?
 201         return n < nFormatCount;
 202     }
 203 }
 204
 205 // ----------------------------------------------------------------------------
 206 // wxFileDataObject
 207 // ----------------------------------------------------------------------------
 208
 209 bool wxFileDataObject::GetDataHere(void *buf) const
 210 {
 211     wxString filenames;
 212
 213     for (size_t i = 0; i < m_filenames.GetCount(); i++)
 214     {
 215         filenames += wxT("file:");
 216         filenames += m_filenames[i];
 217         filenames += wxT("\r\n");
 218     }
 219
 220     memcpy( buf, filenames.mbc_str(), filenames.length() + 1 );
 221
 222     return true;
 223 }
 224
 225 size_t wxFileDataObject::GetDataSize() const
 226 {
 227     size_t res = 0;
 228
 229     for (size_t i = 0; i < m_filenames.GetCount(); i++)
 230     {
 231         // This is junk in UTF-8
 232         res += m_filenames[i].length();
 233         res += 5 + 2; // "file:" (5) + "\r\n" (2)
 234     }
 235
 236     return res + 1;
 237 }
 238
 239 bool wxFileDataObject::SetData(size_t WXUNUSED(size), const void *buf)
 240 {
 241     m_filenames.Empty();
 242
 243     // we get data in the text/uri-list format, i.e. as a sequence of URIs
 244     // (filenames prefixed by "file:") delimited by "\r\n"
 245     wxString filename;
 246     for ( const char *p = (const char *)buf; ; p++ )
 247     {
 248         // some broken programs (testdnd GTK+ sample!) omit the trailing
 249         // "\r\n", so check for '\0' explicitly here instead of doing it in
 250         // the loop statement to account for it
 251         if ( (*p == '\r' && *(p+1) == '\n') || !*p )
 252         {
 253             size_t lenPrefix = 5; // strlen("file:")
 254             if ( filename.Left(lenPrefix).MakeLower() == wxT("file:") )
 255             {
 256                 // sometimes the syntax is "file:filename", sometimes it's
 257                 // URL-like: "file://filename" - deal with both
 258                 if ( filename[lenPrefix] == wxT('/') &&
 259                      filename[lenPrefix + 1] == wxT('/') )
 260                 {
 261                     // skip the slashes
 262                     lenPrefix += 2;
 263                 }
 264
 265                 AddFile(wxURI::Unescape(filename.c_str() + lenPrefix));
 266                 filename.Empty();
 267             }
 268             else
 269             {
 270                 wxLogDebug(wxT("Unsupported URI '%s' in wxFileDataObject"),
 271                            filename.c_str());
 272             }
 273
 274             if ( !*p )
 275                 break;
 276
 277             // skip '\r'
 278             p++;
 279         }
 280         else
 281         {
 282             filename += *p;
 283         }
 284     }
 285
 286     return true;
 287 }
 288
 289 void wxFileDataObject::AddFile( const wxString &filename )
 290 {
 291    m_filenames.Add( filename );
 292 }
 293
 294 // ----------------------------------------------------------------------------
 295 // wxBitmapDataObject
 296 // ----------------------------------------------------------------------------
 297
 298 wxBitmapDataObject::wxBitmapDataObject()
 299 {
 300     Init();
 301 }
 302
 303 wxBitmapDataObject::wxBitmapDataObject( const wxBitmap& bitmap )
 304                   : wxBitmapDataObjectBase(bitmap)
 305 {
 306     Init();
 307
 308     DoConvertToPng();
 309 }
 310
 311 wxBitmapDataObject::~wxBitmapDataObject()
 312 {
 313     Clear();
 314 }
 315
 316 void wxBitmapDataObject::SetBitmap( const wxBitmap &bitmap )
 317 {
 318     ClearAll();
 319
 320     wxBitmapDataObjectBase::SetBitmap(bitmap);
 321
 322     DoConvertToPng();
 323 }
 324
 325 bool wxBitmapDataObject::GetDataHere(void *buf) const
 326 {
 327     if ( !m_pngSize )
 328     {
 329         wxFAIL_MSG( wxT("attempt to copy empty bitmap failed") );
 330
 331         return false;
 332     }
 333
 334     memcpy(buf, m_pngData, m_pngSize);
 335
 336     return true;
 337 }
 338
 339 bool wxBitmapDataObject::SetData(size_t size, const void *buf)
 340 {
 341     Clear();
 342
 343     wxCHECK_MSG( wxImage::FindHandler(wxBITMAP_TYPE_PNG) != NULL,
 344                  false, wxT("You must call wxImage::AddHandler(new wxPNGHandler); to be able to use clipboard with bitmaps!") );
 345
 346     m_pngSize = size;
 347     m_pngData = malloc(m_pngSize);
 348
 349     memcpy(m_pngData, buf, m_pngSize);
 350
 351     wxMemoryInputStream mstream((char*) m_pngData, m_pngSize);
 352     wxImage image;
 353     if ( !image.LoadFile( mstream, wxBITMAP_TYPE_PNG ) )
 354     {
 355         return false;
 356     }
 357
 358     m_bitmap = wxBitmap(image);
 359
 360     return m_bitmap.IsOk();
 361 }
 362
 363 void wxBitmapDataObject::DoConvertToPng()
 364 {
 365     if ( !m_bitmap.IsOk() )
 366         return;
 367
 368     wxCHECK_RET( wxImage::FindHandler(wxBITMAP_TYPE_PNG) != NULL,
 369                  wxT("You must call wxImage::AddHandler(new wxPNGHandler); to be able to use clipboard with bitmaps!") );
 370
 371     wxImage image = m_bitmap.ConvertToImage();
 372
 373     wxCountingOutputStream count;
 374     image.SaveFile(count, wxBITMAP_TYPE_PNG);
 375
 376     m_pngSize = count.GetSize() + 100; // sometimes the size seems to vary ???
 377     m_pngData = malloc(m_pngSize);
 378
 379     wxMemoryOutputStream mstream((char*) m_pngData, m_pngSize);
 380     image.SaveFile(mstream, wxBITMAP_TYPE_PNG);
 381 }
 382
 383 #endif // wxUSE_DATAOBJ