src/gtk1/dataobj.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        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 #include "wx/dataobj.h"
  14
  15 #if wxUSE_DATAOBJ
  16
  17 #include "wx/app.h"
  18 #include "wx/debug.h"
  19 #include "wx/mstream.h"
  20 #include "wx/image.h"
  21 #include "wx/log.h"
  22 #include "wx/uri.h"
  23
  24 #include <gdk/gdk.h>
  25
  26 //-------------------------------------------------------------------------
  27 // global data
  28 //-------------------------------------------------------------------------
  29
  30 GdkAtom  g_textAtom        = 0;
  31 GdkAtom  g_altTextAtom     = 0;
  32 GdkAtom  g_pngAtom         = 0;
  33 GdkAtom  g_fileAtom        = 0;
  34
  35 //-------------------------------------------------------------------------
  36 // wxDataFormat
  37 //-------------------------------------------------------------------------
  38
  39 wxDataFormat::wxDataFormat()
  40 {
  41     // do *not* call PrepareFormats() from here for 2 reasons:
  42     //
  43     // 1. we will have time to do it later because some other Set function
  44     //    must be called before we really need them
  45     //
  46     // 2. doing so prevents us from declaring global wxDataFormats because
  47     //    calling PrepareFormats (and thus gdk_atom_intern) before GDK is
  48     //    initialised will result in a crash
  49     m_type = wxDF_INVALID;
  50     m_format = (GdkAtom) 0;
  51 }
  52
  53 wxDataFormat::wxDataFormat( wxDataFormatId type )
  54 {
  55     PrepareFormats();
  56     SetType( type );
  57 }
  58
  59 wxDataFormat::wxDataFormat( const wxChar *id )
  60 {
  61     PrepareFormats();
  62     SetId( id );
  63 }
  64
  65 wxDataFormat::wxDataFormat( const wxString &id )
  66 {
  67     PrepareFormats();
  68     SetId( id );
  69 }
  70
  71 wxDataFormat::wxDataFormat( NativeFormat format )
  72 {
  73     PrepareFormats();
  74     SetId( format );
  75 }
  76
  77 void wxDataFormat::SetType( wxDataFormatId type )
  78 {
  79     PrepareFormats();
  80
  81     m_type = type;
  82
  83 #if wxUSE_UNICODE
  84     if (m_type == wxDF_UNICODETEXT)
  85         m_format = g_textAtom;
  86     else if (m_type == wxDF_TEXT)
  87         m_format = g_altTextAtom;
  88 #else
  89     if (m_type == wxDF_TEXT || m_type == wxDF_UNICODETEXT)
  90         m_format = g_textAtom;
  91 #endif
  92     else
  93     if (m_type == wxDF_BITMAP)
  94         m_format = g_pngAtom;
  95     else
  96     if (m_type == wxDF_FILENAME)
  97         m_format = g_fileAtom;
  98     else
  99     {
 100        wxFAIL_MSG( wxT("invalid dataformat") );
 101     }
 102 }
 103
 104 wxDataFormatId wxDataFormat::GetType() const
 105 {
 106     return m_type;
 107 }
 108
 109 wxString wxDataFormat::GetId() const
 110 {
 111     gchar* atom_name = gdk_atom_name( m_format );
 112     wxString ret = wxString::FromAscii( atom_name );
 113     g_free(atom_name);
 114     return ret;
 115 }
 116
 117 void wxDataFormat::SetId( NativeFormat format )
 118 {
 119     PrepareFormats();
 120     m_format = format;
 121
 122     if (m_format == g_textAtom)
 123 #if wxUSE_UNICODE
 124         m_type = wxDF_UNICODETEXT;
 125 #else
 126         m_type = wxDF_TEXT;
 127 #endif
 128     else
 129     if (m_format == g_altTextAtom)
 130         m_type = wxDF_TEXT;
 131     else
 132     if (m_format == g_pngAtom)
 133         m_type = wxDF_BITMAP;
 134     else
 135     if (m_format == g_fileAtom)
 136         m_type = wxDF_FILENAME;
 137     else
 138         m_type = wxDF_PRIVATE;
 139 }
 140
 141 void wxDataFormat::SetId( const wxChar *id )
 142 {
 143     PrepareFormats();
 144     m_type = wxDF_PRIVATE;
 145     wxString tmp( id );
 146     m_format = gdk_atom_intern( (const char*) tmp.ToAscii(), FALSE );
 147 }
 148
 149 void wxDataFormat::PrepareFormats()
 150 {
 151     // VZ: GNOME included in RedHat 6.1 uses the MIME types below and not the
 152     //     atoms STRING and file:ALL as the old code was, but normal X apps
 153     //     use STRING for text selection when transfering the data via
 154     //     clipboard, for example, so do use STRING for now (GNOME apps will
 155     //     probably support STRING as well for compatibility anyhow), but use
 156     //     text/uri-list for file dnd because compatibility is not important
 157     //     here (with whom?)
 158     if (!g_textAtom)
 159 #if wxUSE_UNICODE
 160         g_textAtom = gdk_atom_intern( "UTF8_STRING", FALSE );
 161         g_altTextAtom = gdk_atom_intern( "STRING", FALSE );
 162 #else
 163         g_textAtom = gdk_atom_intern( "STRING" /* "text/plain" */, FALSE );
 164 #endif
 165     if (!g_pngAtom)
 166         g_pngAtom = gdk_atom_intern( "image/png", FALSE );
 167     if (!g_fileAtom)
 168         g_fileAtom = gdk_atom_intern( "text/uri-list", FALSE );
 169 }
 170
 171 //-------------------------------------------------------------------------
 172 // wxDataObject
 173 //-------------------------------------------------------------------------
 174
 175 wxDataObject::wxDataObject()
 176 {
 177 }
 178
 179 wxDataObject::~wxDataObject()
 180 {
 181     // dtor is empty but needed for Darwin and AIX -- otherwise it doesn't link
 182 }
 183
 184 bool wxDataObject::IsSupportedFormat(const wxDataFormat& format, Direction dir) const
 185 {
 186     size_t nFormatCount = GetFormatCount(dir);
 187     if ( nFormatCount == 1 )
 188     {
 189         return format == GetPreferredFormat();
 190     }
 191     else
 192     {
 193         wxDataFormat *formats = new wxDataFormat[nFormatCount];
 194         GetAllFormats(formats,dir);
 195
 196         size_t n;
 197         for ( n = 0; n < nFormatCount; n++ )
 198         {
 199             if ( formats[n] == format )
 200                 break;
 201         }
 202
 203         delete [] formats;
 204
 205         // found?
 206         return n < nFormatCount;
 207     }
 208 }
 209
 210 // ----------------------------------------------------------------------------
 211 // wxFileDataObject
 212 // ----------------------------------------------------------------------------
 213
 214 bool wxFileDataObject::GetDataHere(void *buf) const
 215 {
 216     wxString filenames;
 217
 218     for (size_t i = 0; i < m_filenames.GetCount(); i++)
 219     {
 220         filenames += wxT("file:");
 221         filenames += m_filenames[i];
 222         filenames += wxT("\r\n");
 223     }
 224
 225     memcpy( buf, filenames.mbc_str(), filenames.Len() + 1 );
 226
 227     return TRUE;
 228 }
 229
 230 size_t wxFileDataObject::GetDataSize() const
 231 {
 232     size_t res = 0;
 233
 234     for (size_t i = 0; i < m_filenames.GetCount(); i++)
 235     {
 236         // This is junk in UTF-8
 237         res += m_filenames[i].Len();
 238         res += 5 + 2; // "file:" (5) + "\r\n" (2)
 239     }
 240
 241     return res + 1;
 242 }
 243
 244 bool wxFileDataObject::SetData(size_t WXUNUSED(size), const void *buf)
 245 {
 246     m_filenames.Empty();
 247
 248     // we get data in the text/uri-list format, i.e. as a sequence of URIs
 249     // (filenames prefixed by "file:") delimited by "\r\n"
 250     wxString filename;
 251     for ( const char *p = (const char *)buf; ; p++ )
 252     {
 253         // some broken programs (testdnd GTK+ sample!) omit the trailing
 254         // "\r\n", so check for '\0' explicitly here instead of doing it in
 255         // the loop statement to account for it
 256         if ( (*p == '\r' && *(p+1) == '\n') || !*p )
 257         {
 258             size_t lenPrefix = 5; // strlen("file:")
 259             if ( filename.Left(lenPrefix).MakeLower() == _T("file:") )
 260             {
 261                 // sometimes the syntax is "file:filename", sometimes it's
 262                 // URL-like: "file://filename" - deal with both
 263                 if ( filename[lenPrefix] == _T('/') &&
 264                      filename[lenPrefix + 1] == _T('/') )
 265                 {
 266                     // skip the slashes
 267                     lenPrefix += 2;
 268                 }
 269
 270                 AddFile(wxURI::Unescape(filename.c_str() + lenPrefix));
 271                 filename.Empty();
 272             }
 273             else
 274             {
 275                 wxLogDebug(_T("Unsupported URI '%s' in wxFileDataObject"),
 276                            filename.c_str());
 277             }
 278
 279             if ( !*p )
 280                 break;
 281
 282             // skip '\r'
 283             p++;
 284         }
 285         else
 286         {
 287             filename += *p;
 288         }
 289     }
 290
 291     return TRUE;
 292 }
 293
 294 void wxFileDataObject::AddFile( const wxString &filename )
 295 {
 296    m_filenames.Add( filename );
 297 }
 298
 299 // ----------------------------------------------------------------------------
 300 // wxBitmapDataObject
 301 // ----------------------------------------------------------------------------
 302
 303 wxBitmapDataObject::wxBitmapDataObject()
 304 {
 305     Init();
 306 }
 307
 308 wxBitmapDataObject::wxBitmapDataObject( const wxBitmap& bitmap )
 309                   : wxBitmapDataObjectBase(bitmap)
 310 {
 311     Init();
 312
 313     DoConvertToPng();
 314 }
 315
 316 wxBitmapDataObject::~wxBitmapDataObject()
 317 {
 318     Clear();
 319 }
 320
 321 void wxBitmapDataObject::SetBitmap( const wxBitmap &bitmap )
 322 {
 323     ClearAll();
 324
 325     wxBitmapDataObjectBase::SetBitmap(bitmap);
 326
 327     DoConvertToPng();
 328 }
 329
 330 bool wxBitmapDataObject::GetDataHere(void *buf) const
 331 {
 332     if ( !m_pngSize )
 333     {
 334         wxFAIL_MSG( wxT("attempt to copy empty bitmap failed") );
 335
 336         return FALSE;
 337     }
 338
 339     memcpy(buf, m_pngData, m_pngSize);
 340
 341     return TRUE;
 342 }
 343
 344 bool wxBitmapDataObject::SetData(size_t size, const void *buf)
 345 {
 346     Clear();
 347
 348     wxCHECK_MSG( wxImage::FindHandler(wxBITMAP_TYPE_PNG) != NULL,
 349                  FALSE, wxT("You must call wxImage::AddHandler(new wxPNGHandler); to be able to use clipboard with bitmaps!") );
 350
 351     m_pngSize = size;
 352     m_pngData = malloc(m_pngSize);
 353
 354     memcpy(m_pngData, buf, m_pngSize);
 355
 356     wxMemoryInputStream mstream((char*) m_pngData, m_pngSize);
 357     wxImage image;
 358     if ( !image.LoadFile( mstream, wxBITMAP_TYPE_PNG ) )
 359     {
 360         return FALSE;
 361     }
 362
 363     m_bitmap = wxBitmap(image);
 364
 365     return m_bitmap.Ok();
 366 }
 367
 368 void wxBitmapDataObject::DoConvertToPng()
 369 {
 370     if ( !m_bitmap.Ok() )
 371         return;
 372
 373     wxCHECK_RET( wxImage::FindHandler(wxBITMAP_TYPE_PNG) != NULL,
 374                  wxT("You must call wxImage::AddHandler(new wxPNGHandler); to be able to use clipboard with bitmaps!") );
 375
 376     wxImage image = m_bitmap.ConvertToImage();
 377
 378     wxCountingOutputStream count;
 379     image.SaveFile(count, wxBITMAP_TYPE_PNG);
 380
 381     m_pngSize = count.GetSize() + 100; // sometimes the size seems to vary ???
 382     m_pngData = malloc(m_pngSize);
 383
 384     wxMemoryOutputStream mstream((char*) m_pngData, m_pngSize);
 385     image.SaveFile(mstream, wxBITMAP_TYPE_PNG);
 386 }
 387
 388 #endif // wxUSE_DATAOBJ