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 wxDataFormat::wxDataFormat( const wxChar *id )
  62 {
  63     PrepareFormats();
  64     SetId( id );
  65 }
  66
  67 wxDataFormat::wxDataFormat( const wxString &id )
  68 {
  69     PrepareFormats();
  70     SetId( id );
  71 }
  72
  73 wxDataFormat::wxDataFormat( NativeFormat format )
  74 {
  75     PrepareFormats();
  76     SetId( format );
  77 }
  78
  79 void wxDataFormat::SetType( wxDataFormatId type )
  80 {
  81     PrepareFormats();
  82
  83     m_type = type;
  84
  85 #if wxUSE_UNICODE
  86     if (m_type == wxDF_UNICODETEXT)
  87         m_format = g_textAtom;
  88     else if (m_type == wxDF_TEXT)
  89         m_format = g_altTextAtom;
  90 #else
  91     if (m_type == wxDF_TEXT || m_type == wxDF_UNICODETEXT)
  92         m_format = g_textAtom;
  93 #endif
  94     else
  95     if (m_type == wxDF_BITMAP)
  96         m_format = g_pngAtom;
  97     else
  98     if (m_type == wxDF_FILENAME)
  99         m_format = g_fileAtom;
 100     else
 101     {
 102        wxFAIL_MSG( wxT("invalid dataformat") );
 103     }
 104 }
 105
 106 wxDataFormatId wxDataFormat::GetType() const
 107 {
 108     return m_type;
 109 }
 110
 111 wxString wxDataFormat::GetId() const
 112 {
 113     gchar* atom_name = gdk_atom_name( m_format );
 114     wxString ret = wxString::FromAscii( atom_name );
 115     g_free(atom_name);
 116     return ret;
 117 }
 118
 119 void wxDataFormat::SetId( NativeFormat format )
 120 {
 121     PrepareFormats();
 122     m_format = format;
 123
 124     if (m_format == g_textAtom)
 125 #if wxUSE_UNICODE
 126         m_type = wxDF_UNICODETEXT;
 127 #else
 128         m_type = wxDF_TEXT;
 129 #endif
 130     else
 131     if (m_format == g_altTextAtom)
 132         m_type = wxDF_TEXT;
 133     else
 134     if (m_format == g_pngAtom)
 135         m_type = wxDF_BITMAP;
 136     else
 137     if (m_format == g_fileAtom)
 138         m_type = wxDF_FILENAME;
 139     else
 140         m_type = wxDF_PRIVATE;
 141 }
 142
 143 void wxDataFormat::SetId( const wxChar *id )
 144 {
 145     PrepareFormats();
 146     m_type = wxDF_PRIVATE;
 147     wxString tmp( id );
 148     m_format = gdk_atom_intern( (const char*) tmp.ToAscii(), FALSE );
 149 }
 150
 151 void wxDataFormat::PrepareFormats()
 152 {
 153     // VZ: GNOME included in RedHat 6.1 uses the MIME types below and not the
 154     //     atoms STRING and file:ALL as the old code was, but normal X apps
 155     //     use STRING for text selection when transfering the data via
 156     //     clipboard, for example, so do use STRING for now (GNOME apps will
 157     //     probably support STRING as well for compatibility anyhow), but use
 158     //     text/uri-list for file dnd because compatibility is not important
 159     //     here (with whom?)
 160     if (!g_textAtom)
 161 #if wxUSE_UNICODE
 162         g_textAtom = gdk_atom_intern( "UTF8_STRING", FALSE );
 163         g_altTextAtom = gdk_atom_intern( "STRING", FALSE );
 164 #else
 165         g_textAtom = gdk_atom_intern( "STRING" /* "text/plain" */, FALSE );
 166 #endif
 167     if (!g_pngAtom)
 168         g_pngAtom = gdk_atom_intern( "image/png", FALSE );
 169     if (!g_fileAtom)
 170         g_fileAtom = gdk_atom_intern( "text/uri-list", FALSE );
 171 }
 172
 173 //-------------------------------------------------------------------------
 174 // wxDataObject
 175 //-------------------------------------------------------------------------
 176
 177 wxDataObject::wxDataObject()
 178 {
 179 }
 180
 181 wxDataObject::~wxDataObject()
 182 {
 183     // dtor is empty but needed for Darwin and AIX -- otherwise it doesn't link
 184 }
 185
 186 bool wxDataObject::IsSupportedFormat(const wxDataFormat& format, Direction dir) const
 187 {
 188     size_t nFormatCount = GetFormatCount(dir);
 189     if ( nFormatCount == 1 )
 190     {
 191         return format == GetPreferredFormat();
 192     }
 193     else
 194     {
 195         wxDataFormat *formats = new wxDataFormat[nFormatCount];
 196         GetAllFormats(formats,dir);
 197
 198         size_t n;
 199         for ( n = 0; n < nFormatCount; n++ )
 200         {
 201             if ( formats[n] == format )
 202                 break;
 203         }
 204
 205         delete [] formats;
 206
 207         // found?
 208         return n < nFormatCount;
 209     }
 210 }
 211
 212 // ----------------------------------------------------------------------------
 213 // wxFileDataObject
 214 // ----------------------------------------------------------------------------
 215
 216 bool wxFileDataObject::GetDataHere(void *buf) const
 217 {
 218     wxString filenames;
 219
 220     for (size_t i = 0; i < m_filenames.GetCount(); i++)
 221     {
 222         filenames += wxT("file:");
 223         filenames += m_filenames[i];
 224         filenames += wxT("\r\n");
 225     }
 226
 227     memcpy( buf, filenames.mbc_str(), filenames.length() + 1 );
 228
 229     return true;
 230 }
 231
 232 size_t wxFileDataObject::GetDataSize() const
 233 {
 234     size_t res = 0;
 235
 236     for (size_t i = 0; i < m_filenames.GetCount(); i++)
 237     {
 238         // This is junk in UTF-8
 239         res += m_filenames[i].length();
 240         res += 5 + 2; // "file:" (5) + "\r\n" (2)
 241     }
 242
 243     return res + 1;
 244 }
 245
 246 bool wxFileDataObject::SetData(size_t WXUNUSED(size), const void *buf)
 247 {
 248     m_filenames.Empty();
 249
 250     // we get data in the text/uri-list format, i.e. as a sequence of URIs
 251     // (filenames prefixed by "file:") delimited by "\r\n"
 252     wxString filename;
 253     for ( const char *p = (const char *)buf; ; p++ )
 254     {
 255         // some broken programs (testdnd GTK+ sample!) omit the trailing
 256         // "\r\n", so check for '\0' explicitly here instead of doing it in
 257         // the loop statement to account for it
 258         if ( (*p == '\r' && *(p+1) == '\n') || !*p )
 259         {
 260             size_t lenPrefix = 5; // strlen("file:")
 261             if ( filename.Left(lenPrefix).MakeLower() == _T("file:") )
 262             {
 263                 // sometimes the syntax is "file:filename", sometimes it's
 264                 // URL-like: "file://filename" - deal with both
 265                 if ( filename[lenPrefix] == _T('/') &&
 266                      filename[lenPrefix + 1] == _T('/') )
 267                 {
 268                     // skip the slashes
 269                     lenPrefix += 2;
 270                 }
 271
 272                 AddFile(wxURI::Unescape(filename.c_str() + lenPrefix));
 273                 filename.Empty();
 274             }
 275             else
 276             {
 277                 wxLogDebug(_T("Unsupported URI '%s' in wxFileDataObject"),
 278                            filename.c_str());
 279             }
 280
 281             if ( !*p )
 282                 break;
 283
 284             // skip '\r'
 285             p++;
 286         }
 287         else
 288         {
 289             filename += *p;
 290         }
 291     }
 292
 293     return true;
 294 }
 295
 296 void wxFileDataObject::AddFile( const wxString &filename )
 297 {
 298    m_filenames.Add( filename );
 299 }
 300
 301 // ----------------------------------------------------------------------------
 302 // wxBitmapDataObject
 303 // ----------------------------------------------------------------------------
 304
 305 wxBitmapDataObject::wxBitmapDataObject()
 306 {
 307     Init();
 308 }
 309
 310 wxBitmapDataObject::wxBitmapDataObject( const wxBitmap& bitmap )
 311                   : wxBitmapDataObjectBase(bitmap)
 312 {
 313     Init();
 314
 315     DoConvertToPng();
 316 }
 317
 318 wxBitmapDataObject::~wxBitmapDataObject()
 319 {
 320     Clear();
 321 }
 322
 323 void wxBitmapDataObject::SetBitmap( const wxBitmap &bitmap )
 324 {
 325     ClearAll();
 326
 327     wxBitmapDataObjectBase::SetBitmap(bitmap);
 328
 329     DoConvertToPng();
 330 }
 331
 332 bool wxBitmapDataObject::GetDataHere(void *buf) const
 333 {
 334     if ( !m_pngSize )
 335     {
 336         wxFAIL_MSG( wxT("attempt to copy empty bitmap failed") );
 337
 338         return false;
 339     }
 340
 341     memcpy(buf, m_pngData, m_pngSize);
 342
 343     return true;
 344 }
 345
 346 bool wxBitmapDataObject::SetData(size_t size, const void *buf)
 347 {
 348     Clear();
 349
 350     wxCHECK_MSG( wxImage::FindHandler(wxBITMAP_TYPE_PNG) != NULL,
 351                  false, wxT("You must call wxImage::AddHandler(new wxPNGHandler); to be able to use clipboard with bitmaps!") );
 352
 353     m_pngSize = size;
 354     m_pngData = malloc(m_pngSize);
 355
 356     memcpy(m_pngData, buf, m_pngSize);
 357
 358     wxMemoryInputStream mstream((char*) m_pngData, m_pngSize);
 359     wxImage image;
 360     if ( !image.LoadFile( mstream, wxBITMAP_TYPE_PNG ) )
 361     {
 362         return false;
 363     }
 364
 365     m_bitmap = wxBitmap(image);
 366
 367     return m_bitmap.Ok();
 368 }
 369
 370 void wxBitmapDataObject::DoConvertToPng()
 371 {
 372     if ( !m_bitmap.Ok() )
 373         return;
 374
 375     wxCHECK_RET( wxImage::FindHandler(wxBITMAP_TYPE_PNG) != NULL,
 376                  wxT("You must call wxImage::AddHandler(new wxPNGHandler); to be able to use clipboard with bitmaps!") );
 377
 378     wxImage image = m_bitmap.ConvertToImage();
 379
 380     wxCountingOutputStream count;
 381     image.SaveFile(count, wxBITMAP_TYPE_PNG);
 382
 383     m_pngSize = count.GetSize() + 100; // sometimes the size seems to vary ???
 384     m_pngData = malloc(m_pngSize);
 385
 386     wxMemoryOutputStream mstream((char*) m_pngData, m_pngSize);
 387     image.SaveFile(mstream, wxBITMAP_TYPE_PNG);
 388 }
 389
 390 #endif // wxUSE_DATAOBJ