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 #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 // wxTextDataObject
 215 // ----------------------------------------------------------------------------
 216
 217 #if defined(__WXGTK20__) && wxUSE_UNICODE
 218 void wxTextDataObject::GetAllFormats(wxDataFormat *formats, wxDataObjectBase::Direction dir) const
 219 {
 220     *formats++ = GetPreferredFormat();
 221     *formats = g_altTextAtom;
 222 }
 223 #endif
 224
 225 // ----------------------------------------------------------------------------
 226 // wxFileDataObject
 227 // ----------------------------------------------------------------------------
 228
 229 bool wxFileDataObject::GetDataHere(void *buf) const
 230 {
 231     wxString filenames;
 232
 233     for (size_t i = 0; i < m_filenames.GetCount(); i++)
 234     {
 235         filenames += wxT("file:");
 236         filenames += m_filenames[i];
 237         filenames += wxT("\r\n");
 238     }
 239
 240     memcpy( buf, filenames.mbc_str(), filenames.Len() + 1 );
 241
 242     return true;
 243 }
 244
 245 size_t wxFileDataObject::GetDataSize() const
 246 {
 247     size_t res = 0;
 248
 249     for (size_t i = 0; i < m_filenames.GetCount(); i++)
 250     {
 251         // This is junk in UTF-8
 252         res += m_filenames[i].Len();
 253         res += 5 + 2; // "file:" (5) + "\r\n" (2)
 254     }
 255
 256     return res + 1;
 257 }
 258
 259 bool wxFileDataObject::SetData(size_t WXUNUSED(size), const void *buf)
 260 {
 261     m_filenames.Empty();
 262
 263     // we get data in the text/uri-list format, i.e. as a sequence of URIs
 264     // (filenames prefixed by "file:") delimited by "\r\n"
 265     wxString filename;
 266     for ( const char *p = (const char *)buf; ; p++ )
 267     {
 268         // some broken programs (testdnd GTK+ sample!) omit the trailing
 269         // "\r\n", so check for '\0' explicitly here instead of doing it in
 270         // the loop statement to account for it
 271         if ( (*p == '\r' && *(p+1) == '\n') || !*p )
 272         {
 273             size_t lenPrefix = 5; // strlen("file:")
 274             if ( filename.Left(lenPrefix).MakeLower() == _T("file:") )
 275             {
 276                 // sometimes the syntax is "file:filename", sometimes it's
 277                 // URL-like: "file://filename" - deal with both
 278                 if ( filename[lenPrefix] == _T('/') &&
 279                      filename[lenPrefix + 1] == _T('/') )
 280                 {
 281                     // skip the slashes
 282                     lenPrefix += 2;
 283                 }
 284
 285                 AddFile(wxURI::Unescape(filename.c_str() + lenPrefix));
 286                 filename.Empty();
 287             }
 288             else if ( !filename.empty() )
 289             {
 290                 wxLogDebug(_T("Unsupported URI \"%s\" in wxFileDataObject"),
 291                            filename.c_str());
 292             }
 293
 294             if ( !*p )
 295                 break;
 296
 297             // skip '\r'
 298             p++;
 299         }
 300         else
 301         {
 302             filename += *p;
 303         }
 304     }
 305
 306     return true;
 307 }
 308
 309 void wxFileDataObject::AddFile( const wxString &filename )
 310 {
 311    m_filenames.Add( filename );
 312 }
 313
 314 // ----------------------------------------------------------------------------
 315 // wxBitmapDataObject
 316 // ----------------------------------------------------------------------------
 317
 318 wxBitmapDataObject::wxBitmapDataObject()
 319 {
 320     Init();
 321 }
 322
 323 wxBitmapDataObject::wxBitmapDataObject( const wxBitmap& bitmap )
 324                   : wxBitmapDataObjectBase(bitmap)
 325 {
 326     Init();
 327
 328     DoConvertToPng();
 329 }
 330
 331 wxBitmapDataObject::~wxBitmapDataObject()
 332 {
 333     Clear();
 334 }
 335
 336 void wxBitmapDataObject::SetBitmap( const wxBitmap &bitmap )
 337 {
 338     ClearAll();
 339
 340     wxBitmapDataObjectBase::SetBitmap(bitmap);
 341
 342     DoConvertToPng();
 343 }
 344
 345 bool wxBitmapDataObject::GetDataHere(void *buf) const
 346 {
 347     if ( !m_pngSize )
 348     {
 349         wxFAIL_MSG( wxT("attempt to copy empty bitmap failed") );
 350
 351         return false;
 352     }
 353
 354     memcpy(buf, m_pngData, m_pngSize);
 355
 356     return true;
 357 }
 358
 359 bool wxBitmapDataObject::SetData(size_t size, const void *buf)
 360 {
 361     Clear();
 362
 363     wxCHECK_MSG( wxImage::FindHandler(wxBITMAP_TYPE_PNG) != NULL,
 364                  false, wxT("You must call wxImage::AddHandler(new wxPNGHandler); to be able to use clipboard with bitmaps!") );
 365
 366     m_pngSize = size;
 367     m_pngData = malloc(m_pngSize);
 368
 369     memcpy(m_pngData, buf, m_pngSize);
 370
 371     wxMemoryInputStream mstream((char*) m_pngData, m_pngSize);
 372     wxImage image;
 373     if ( !image.LoadFile( mstream, wxBITMAP_TYPE_PNG ) )
 374     {
 375         return false;
 376     }
 377
 378     m_bitmap = wxBitmap(image);
 379
 380     return m_bitmap.Ok();
 381 }
 382
 383 void wxBitmapDataObject::DoConvertToPng()
 384 {
 385     if ( !m_bitmap.Ok() )
 386         return;
 387
 388     wxCHECK_RET( wxImage::FindHandler(wxBITMAP_TYPE_PNG) != NULL,
 389                  wxT("You must call wxImage::AddHandler(new wxPNGHandler); to be able to use clipboard with bitmaps!") );
 390
 391     wxImage image = m_bitmap.ConvertToImage();
 392
 393     wxCountingOutputStream count;
 394     image.SaveFile(count, wxBITMAP_TYPE_PNG);
 395
 396     m_pngSize = count.GetSize() + 100; // sometimes the size seems to vary ???
 397     m_pngData = malloc(m_pngSize);
 398
 399     wxMemoryOutputStream mstream((char*) m_pngData, m_pngSize);
 400     image.SaveFile(mstream, wxBITMAP_TYPE_PNG);
 401 }
 402
 403 #endif // wxUSE_DATAOBJ