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     {
 153 #if wxUSE_UNICODE
 154         g_textAtom = gdk_atom_intern( "UTF8_STRING", FALSE );
 155         g_altTextAtom = gdk_atom_intern( "STRING", FALSE );
 156 #else
 157         g_textAtom = gdk_atom_intern( "STRING" /* "text/plain" */, FALSE );
 158 #endif
 159     }
 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 // wxTextDataObject
 207 // ----------------------------------------------------------------------------
 208
 209 #if wxUSE_UNICODE
 210
 211 void
 212 wxTextDataObject::GetAllFormats(wxDataFormat *formats,
 213                                 wxDataObjectBase::Direction WXUNUSED(dir)) const
 214 {
 215     *formats++ = GetPreferredFormat();
 216     *formats = g_altTextAtom;
 217 }
 218
 219 #endif // wxUSE_UNICODE
 220
 221 // ----------------------------------------------------------------------------
 222 // wxFileDataObject
 223 // ----------------------------------------------------------------------------
 224
 225 bool wxFileDataObject::GetDataHere(void *buf) const
 226 {
 227     wxString filenames;
 228
 229     for (size_t i = 0; i < m_filenames.GetCount(); i++)
 230     {
 231         filenames += wxT("file:");
 232         filenames += m_filenames[i];
 233         filenames += wxT("\r\n");
 234     }
 235
 236     memcpy( buf, filenames.mbc_str(), filenames.length() + 1 );
 237
 238     return true;
 239 }
 240
 241 size_t wxFileDataObject::GetDataSize() const
 242 {
 243     size_t res = 0;
 244
 245     for (size_t i = 0; i < m_filenames.GetCount(); i++)
 246     {
 247         // This is junk in UTF-8
 248         res += m_filenames[i].length();
 249         res += 5 + 2; // "file:" (5) + "\r\n" (2)
 250     }
 251
 252     return res + 1;
 253 }
 254
 255 bool wxFileDataObject::SetData(size_t WXUNUSED(size), const void *buf)
 256 {
 257     // we get data in the text/uri-list format, i.e. as a sequence of URIs
 258     // (filenames prefixed by "file:") delimited by "\r\n". size includes
 259     // the trailing zero (in theory, not for Nautilus in early GNOME
 260     // versions).
 261
 262     m_filenames.Empty();
 263
 264     const gchar *nexttemp = (const gchar*) buf;
 265     for ( ; ; )
 266     {
 267         int len = 0;
 268         const gchar *temp = nexttemp;
 269         for (;;)
 270         {
 271             if (temp[len] == 0)
 272             {
 273                 if (len > 0)
 274                 {
 275                     // if an app omits '\r''\n'
 276                     nexttemp = temp+len;
 277                     break;
 278                 }
 279
 280                 return true;
 281             }
 282             if (temp[len] == '\r')
 283             {
 284                 if (temp[len+1] == '\n')
 285                     nexttemp = temp+len+2;
 286                 else
 287                     nexttemp = temp+len+1;
 288                 break;
 289             }
 290             len++;
 291         }
 292
 293         if (len == 0)
 294             break;
 295
 296         // required to give it a trailing zero
 297         gchar *uri = g_strndup( temp, len );
 298
 299         gchar *fn = g_filename_from_uri( uri, NULL, NULL );
 300
 301         g_free( uri );
 302
 303         if (fn)
 304         {
 305             AddFile( wxConvFileName->cMB2WX( fn ) );
 306             g_free( fn );
 307         }
 308     }
 309
 310     return true;
 311 }
 312
 313 void wxFileDataObject::AddFile( const wxString &filename )
 314 {
 315    m_filenames.Add( filename );
 316 }
 317
 318 // ----------------------------------------------------------------------------
 319 // wxBitmapDataObject
 320 // ----------------------------------------------------------------------------
 321
 322 wxBitmapDataObject::wxBitmapDataObject()
 323 {
 324     Init();
 325 }
 326
 327 wxBitmapDataObject::wxBitmapDataObject( const wxBitmap& bitmap )
 328                   : wxBitmapDataObjectBase(bitmap)
 329 {
 330     Init();
 331
 332     DoConvertToPng();
 333 }
 334
 335 wxBitmapDataObject::~wxBitmapDataObject()
 336 {
 337     Clear();
 338 }
 339
 340 void wxBitmapDataObject::SetBitmap( const wxBitmap &bitmap )
 341 {
 342     ClearAll();
 343
 344     wxBitmapDataObjectBase::SetBitmap(bitmap);
 345
 346     DoConvertToPng();
 347 }
 348
 349 bool wxBitmapDataObject::GetDataHere(void *buf) const
 350 {
 351     if ( !m_pngSize )
 352     {
 353         wxFAIL_MSG( wxT("attempt to copy empty bitmap failed") );
 354
 355         return false;
 356     }
 357
 358     memcpy(buf, m_pngData, m_pngSize);
 359
 360     return true;
 361 }
 362
 363 bool wxBitmapDataObject::SetData(size_t size, const void *buf)
 364 {
 365     Clear();
 366
 367     wxCHECK_MSG( wxImage::FindHandler(wxBITMAP_TYPE_PNG) != NULL,
 368                  false, wxT("You must call wxImage::AddHandler(new wxPNGHandler); to be able to use clipboard with bitmaps!") );
 369
 370     m_pngSize = size;
 371     m_pngData = malloc(m_pngSize);
 372
 373     memcpy(m_pngData, buf, m_pngSize);
 374
 375     wxMemoryInputStream mstream((char*) m_pngData, m_pngSize);
 376     wxImage image;
 377     if ( !image.LoadFile( mstream, wxBITMAP_TYPE_PNG ) )
 378     {
 379         return false;
 380     }
 381
 382     m_bitmap = wxBitmap(image);
 383
 384     return m_bitmap.Ok();
 385 }
 386
 387 void wxBitmapDataObject::DoConvertToPng()
 388 {
 389     if ( !m_bitmap.Ok() )
 390         return;
 391
 392     wxCHECK_RET( wxImage::FindHandler(wxBITMAP_TYPE_PNG) != NULL,
 393                  wxT("You must call wxImage::AddHandler(new wxPNGHandler); to be able to use clipboard with bitmaps!") );
 394
 395     wxImage image = m_bitmap.ConvertToImage();
 396
 397     wxCountingOutputStream count;
 398     image.SaveFile(count, wxBITMAP_TYPE_PNG);
 399
 400     m_pngSize = count.GetSize() + 100; // sometimes the size seems to vary ???
 401     m_pngData = malloc(m_pngSize);
 402
 403     wxMemoryOutputStream mstream((char*) m_pngData, m_pngSize);
 404     image.SaveFile(mstream, wxBITMAP_TYPE_PNG);
 405 }
 406
 407 // ----------------------------------------------------------------------------
 408 // wxURLDataObject
 409 // ----------------------------------------------------------------------------
 410
 411 wxURLDataObject::wxURLDataObject(const wxString& url) :
 412    wxDataObjectSimple( wxDataFormat( gdk_atom_intern("text/x-moz-url",FALSE) ) )
 413 {
 414    m_url = url;
 415 }
 416
 417 size_t wxURLDataObject::GetDataSize() const
 418 {
 419     if (m_url.empty())
 420         return 0;
 421
 422     return 2*m_url.Len()+2;
 423 }
 424
 425 bool wxURLDataObject::GetDataHere(void *buf) const
 426 {
 427     if (m_url.empty())
 428         return false;
 429
 430     wxCSConv conv( "UCS2" );
 431     conv.FromWChar( (char*) buf, 2*m_url.Len()+2, m_url.wc_str() );
 432
 433     return true;
 434 }
 435
 436     // copy data from buffer to our data
 437 bool wxURLDataObject::SetData(size_t len, const void *buf)
 438 {
 439     if (len == 0)
 440     {
 441         m_url = wxEmptyString;
 442         return false;
 443     }
 444
 445     wxCSConv conv( "UCS2" );
 446     wxWCharBuffer res = conv.cMB2WC( (const char*) buf );
 447     m_url = res;
 448     int pos = m_url.Find( '\n' );
 449     if (pos != wxNOT_FOUND)
 450         m_url.Remove( pos, m_url.Len() - pos );
 451
 452     return true;
 453 }
 454
 455
 456 #endif // wxUSE_DATAOBJ