src/gtk/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 // wxTextDataObject
 212 // ----------------------------------------------------------------------------
 213
 214 #if defined(__WXGTK20__) && wxUSE_UNICODE
 215 void wxTextDataObject::GetAllFormats(wxDataFormat *formats, wxDataObjectBase::Direction dir) const
 216 {
 217     *formats++ = GetPreferredFormat();
 218     *formats = g_altTextAtom;
 219 }
 220 #endif
 221
 222 // ----------------------------------------------------------------------------
 223 // wxFileDataObject
 224 // ----------------------------------------------------------------------------
 225
 226 bool wxFileDataObject::GetDataHere(void *buf) const
 227 {
 228     wxString filenames;
 229
 230     for (size_t i = 0; i < m_filenames.GetCount(); i++)
 231     {
 232         filenames += wxT("file:");
 233         filenames += m_filenames[i];
 234         filenames += wxT("\r\n");
 235     }
 236
 237     memcpy( buf, filenames.mbc_str(), filenames.Len() + 1 );
 238
 239     return TRUE;
 240 }
 241
 242 size_t wxFileDataObject::GetDataSize() const
 243 {
 244     size_t res = 0;
 245
 246     for (size_t i = 0; i < m_filenames.GetCount(); i++)
 247     {
 248         // This is junk in UTF-8
 249         res += m_filenames[i].Len();
 250         res += 5 + 2; // "file:" (5) + "\r\n" (2)
 251     }
 252
 253     return res + 1;
 254 }
 255
 256 bool wxFileDataObject::SetData(size_t WXUNUSED(size), const void *buf)
 257 {
 258     m_filenames.Empty();
 259
 260     // we get data in the text/uri-list format, i.e. as a sequence of URIs
 261     // (filenames prefixed by "file:") delimited by "\r\n"
 262     wxString filename;
 263     for ( const char *p = (const char *)buf; ; p++ )
 264     {
 265         // some broken programs (testdnd GTK+ sample!) omit the trailing
 266         // "\r\n", so check for '\0' explicitly here instead of doing it in
 267         // the loop statement to account for it
 268         if ( (*p == '\r' && *(p+1) == '\n') || !*p )
 269         {
 270             size_t lenPrefix = 5; // strlen("file:")
 271             if ( filename.Left(lenPrefix).MakeLower() == _T("file:") )
 272             {
 273                 // sometimes the syntax is "file:filename", sometimes it's
 274                 // URL-like: "file://filename" - deal with both
 275                 if ( filename[lenPrefix] == _T('/') &&
 276                      filename[lenPrefix + 1] == _T('/') )
 277                 {
 278                     // skip the slashes
 279                     lenPrefix += 2;
 280                 }
 281
 282                 AddFile(wxURI::Unescape(filename.c_str() + lenPrefix));
 283                 filename.Empty();
 284             }
 285             else if ( !filename.empty() )
 286             {
 287                 wxLogDebug(_T("Unsupported URI \"%s\" in wxFileDataObject"),
 288                            filename.c_str());
 289             }
 290
 291             if ( !*p )
 292                 break;
 293
 294             // skip '\r'
 295             p++;
 296         }
 297         else
 298         {
 299             filename += *p;
 300         }
 301     }
 302
 303     return TRUE;
 304 }
 305
 306 void wxFileDataObject::AddFile( const wxString &filename )
 307 {
 308    m_filenames.Add( filename );
 309 }
 310
 311 // ----------------------------------------------------------------------------
 312 // wxBitmapDataObject
 313 // ----------------------------------------------------------------------------
 314
 315 wxBitmapDataObject::wxBitmapDataObject()
 316 {
 317     Init();
 318 }
 319
 320 wxBitmapDataObject::wxBitmapDataObject( const wxBitmap& bitmap )
 321                   : wxBitmapDataObjectBase(bitmap)
 322 {
 323     Init();
 324
 325     DoConvertToPng();
 326 }
 327
 328 wxBitmapDataObject::~wxBitmapDataObject()
 329 {
 330     Clear();
 331 }
 332
 333 void wxBitmapDataObject::SetBitmap( const wxBitmap &bitmap )
 334 {
 335     ClearAll();
 336
 337     wxBitmapDataObjectBase::SetBitmap(bitmap);
 338
 339     DoConvertToPng();
 340 }
 341
 342 bool wxBitmapDataObject::GetDataHere(void *buf) const
 343 {
 344     if ( !m_pngSize )
 345     {
 346         wxFAIL_MSG( wxT("attempt to copy empty bitmap failed") );
 347
 348         return FALSE;
 349     }
 350
 351     memcpy(buf, m_pngData, m_pngSize);
 352
 353     return TRUE;
 354 }
 355
 356 bool wxBitmapDataObject::SetData(size_t size, const void *buf)
 357 {
 358     Clear();
 359
 360     wxCHECK_MSG( wxImage::FindHandler(wxBITMAP_TYPE_PNG) != NULL,
 361                  FALSE, wxT("You must call wxImage::AddHandler(new wxPNGHandler); to be able to use clipboard with bitmaps!") );
 362
 363     m_pngSize = size;
 364     m_pngData = malloc(m_pngSize);
 365
 366     memcpy(m_pngData, buf, m_pngSize);
 367
 368     wxMemoryInputStream mstream((char*) m_pngData, m_pngSize);
 369     wxImage image;
 370     if ( !image.LoadFile( mstream, wxBITMAP_TYPE_PNG ) )
 371     {
 372         return FALSE;
 373     }
 374
 375     m_bitmap = wxBitmap(image);
 376
 377     return m_bitmap.Ok();
 378 }
 379
 380 void wxBitmapDataObject::DoConvertToPng()
 381 {
 382     if ( !m_bitmap.Ok() )
 383         return;
 384
 385     wxCHECK_RET( wxImage::FindHandler(wxBITMAP_TYPE_PNG) != NULL,
 386                  wxT("You must call wxImage::AddHandler(new wxPNGHandler); to be able to use clipboard with bitmaps!") );
 387
 388     wxImage image = m_bitmap.ConvertToImage();
 389
 390     wxCountingOutputStream count;
 391     image.SaveFile(count, wxBITMAP_TYPE_PNG);
 392
 393     m_pngSize = count.GetSize() + 100; // sometimes the size seems to vary ???
 394     m_pngData = malloc(m_pngSize);
 395
 396     wxMemoryOutputStream mstream((char*) m_pngData, m_pngSize);
 397     image.SaveFile(mstream, wxBITMAP_TYPE_PNG);
 398 }
 399
 400 #endif // wxUSE_DATAOBJ