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