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 #ifdef __GNUG__
  11     #pragma implementation "dataobj.h"
  12 #endif
  13
  14 #include "wx/dataobj.h"
  15 #include "wx/app.h"
  16 #include "wx/debug.h"
  17 #include "wx/mstream.h"
  18 #include "wx/image.h"
  19
  20 #include "gdk/gdk.h"
  21
  22 //-------------------------------------------------------------------------
  23 // global data
  24 //-------------------------------------------------------------------------
  25
  26 GdkAtom  g_textAtom        = 0;
  27 GdkAtom  g_pngAtom         = 0;
  28 GdkAtom  g_fileAtom        = 0;
  29
  30 //-------------------------------------------------------------------------
  31 // wxDataFormat
  32 //-------------------------------------------------------------------------
  33
  34 wxDataFormat::wxDataFormat()
  35 {
  36     PrepareFormats();
  37     m_type = wxDF_INVALID;
  38     m_format = (GdkAtom) 0;
  39 }
  40
  41 wxDataFormat::wxDataFormat( wxDataFormatId type )
  42 {
  43     PrepareFormats();
  44     SetType( type );
  45 }
  46
  47 wxDataFormat::wxDataFormat( const wxChar *id )
  48 {
  49     PrepareFormats();
  50     SetId( id );
  51 }
  52
  53 wxDataFormat::wxDataFormat( const wxString &id )
  54 {
  55     PrepareFormats();
  56     SetId( id );
  57 }
  58
  59 wxDataFormat::wxDataFormat( NativeFormat format )
  60 {
  61     PrepareFormats();
  62     SetId( format );
  63 }
  64
  65 void wxDataFormat::SetType( wxDataFormatId type )
  66 {
  67     m_type = type;
  68
  69     if (m_type == wxDF_TEXT)
  70         m_format = g_textAtom;
  71     else
  72     if (m_type == wxDF_BITMAP)
  73         m_format = g_pngAtom;
  74     else
  75     if (m_type == wxDF_FILENAME)
  76         m_format = g_fileAtom;
  77     else
  78     {
  79        wxFAIL_MSG( wxT("invalid dataformat") );
  80     }
  81 }
  82
  83 wxDataFormatId wxDataFormat::GetType() const
  84 {
  85     return m_type;
  86 }
  87
  88 wxString wxDataFormat::GetId() const
  89 {
  90     wxString ret( gdk_atom_name( m_format ) );  // this will convert from ascii to Unicode
  91     return ret;
  92 }
  93
  94 void wxDataFormat::SetId( NativeFormat format )
  95 {
  96     m_format = format;
  97
  98     if (m_format == g_textAtom)
  99         m_type = wxDF_TEXT;
 100     else
 101     if (m_format == g_pngAtom)
 102         m_type = wxDF_BITMAP;
 103     else
 104     if (m_format == g_fileAtom)
 105         m_type = wxDF_FILENAME;
 106     else
 107         m_type = wxDF_PRIVATE;
 108 }
 109
 110 void wxDataFormat::SetId( const wxChar *id )
 111 {
 112     m_type = wxDF_PRIVATE;
 113     wxString tmp( id );
 114     m_format = gdk_atom_intern( wxMBSTRINGCAST tmp.mbc_str(), FALSE );  // what is the string cast for?
 115 }
 116
 117 void wxDataFormat::PrepareFormats()
 118 {
 119     if (!g_textAtom)
 120         g_textAtom = gdk_atom_intern( "STRING", FALSE );
 121     if (!g_pngAtom)
 122         g_pngAtom = gdk_atom_intern( "image/png", FALSE );
 123     if (!g_fileAtom)
 124         g_fileAtom = gdk_atom_intern( "file:ALL", FALSE );
 125 }
 126
 127 //-------------------------------------------------------------------------
 128 // wxDataObject
 129 //-------------------------------------------------------------------------
 130
 131 IMPLEMENT_ABSTRACT_CLASS( wxDataObject, wxObject )
 132
 133 wxDataObject::wxDataObject()
 134 {
 135 }
 136
 137 wxDataObject::~wxDataObject()
 138 {
 139 }
 140
 141 bool wxDataObject::IsSupportedFormat(const wxDataFormat& format) const
 142 {
 143     size_t nFormatCount = GetFormatCount();
 144     if ( nFormatCount == 1 ) {
 145         return format == GetPreferredFormat();
 146     }
 147     else {
 148         wxDataFormat *formats = new wxDataFormat[nFormatCount];
 149         GetAllFormats(formats);
 150
 151         size_t n;
 152         for ( n = 0; n < nFormatCount; n++ ) {
 153             if ( formats[n] == format )
 154                 break;
 155         }
 156
 157         delete [] formats;
 158
 159         // found?
 160         return n < nFormatCount;
 161     }
 162 }
 163
 164 // ----------------------------------------------------------------------------
 165 // wxFileDataObject
 166 // ----------------------------------------------------------------------------
 167
 168 bool wxFileDataObject::GetDataHere(void *buf) const
 169 {
 170     const wxString& filenames = GetFilenames();
 171     memcpy( buf, filenames.mbc_str(), filenames.Len() + 1 );
 172
 173     return TRUE;
 174 }
 175
 176 size_t wxFileDataObject::GetDataSize() const
 177 {
 178     return GetFilenames().Len() + 1;
 179 }
 180
 181 bool wxFileDataObject::SetData(const void *buf)
 182 {
 183     SetFilenames((const wxChar *)buf);
 184
 185     return TRUE;
 186 }
 187
 188 // ----------------------------------------------------------------------------
 189 // wxBitmapDataObject
 190 // ----------------------------------------------------------------------------
 191
 192 wxBitmapDataObject::wxBitmapDataObject()
 193 {
 194     Init();
 195 }
 196
 197 wxBitmapDataObject::wxBitmapDataObject( const wxBitmap& bitmap )
 198                   : wxBitmapDataObjectBase(bitmap)
 199 {
 200     Init();
 201
 202     DoConvertToPng();
 203 }
 204
 205 wxBitmapDataObject::~wxBitmapDataObject()
 206 {
 207     Clear();
 208 }
 209
 210 void wxBitmapDataObject::SetBitmap( const wxBitmap &bitmap )
 211 {
 212     ClearAll();
 213
 214     wxBitmapDataObjectBase::SetBitmap(bitmap);
 215
 216     DoConvertToPng();
 217 }
 218
 219 bool wxBitmapDataObject::GetDataHere(void *buf) const
 220 {
 221     if ( !m_pngSize )
 222     {
 223         wxFAIL_MSG( wxT("attempt to copy empty bitmap failed") );
 224
 225         return FALSE;
 226     }
 227
 228     memcpy(buf, m_pngData, m_pngSize);
 229
 230     return TRUE;
 231 }
 232
 233 bool wxBitmapDataObject::SetData(size_t size, const void *buf)
 234 {
 235     Clear();
 236
 237     m_pngSize = size;
 238     m_pngData = malloc(m_pngSize);
 239
 240     memcpy( m_pngData, buf, m_pngSize );
 241
 242     wxMemoryInputStream mstream( (char*) m_pngData, m_pngSize );
 243     wxImage image;
 244     wxPNGHandler handler;
 245     if ( !handler.LoadFile( &image, mstream ) )
 246     {
 247         return FALSE;
 248     }
 249
 250     m_bitmap = image.ConvertToBitmap();
 251 }
 252
 253 void wxBitmapDataObject::DoConvertToPng()
 254 {
 255     if (!m_bitmap.Ok())
 256         return;
 257
 258     wxImage image( m_bitmap );
 259     wxPNGHandler handler;
 260
 261     wxCountingOutputStream count;
 262     handler.SaveFile( &image, count );
 263
 264     m_pngSize = count.GetSize() + 100; // sometimes the size seems to vary ???
 265     m_pngData = malloc(m_pngSize);
 266
 267     wxMemoryOutputStream mstream( (char*) m_pngData, m_pngSize );
 268     handler.SaveFile( &image, mstream );
 269 }
 270
 271 // ----------------------------------------------------------------------------
 272 // wxPrivateDataObject
 273 // ----------------------------------------------------------------------------
 274
 275 IMPLEMENT_CLASS( wxPrivateDataObject, wxDataObject )
 276
 277 void wxPrivateDataObject::Free()
 278 {
 279     if ( m_data )
 280         free(m_data);
 281 }
 282
 283 wxPrivateDataObject::wxPrivateDataObject()
 284 {
 285     wxString id = wxT("application/");
 286     id += wxTheApp->GetAppName();
 287
 288     m_format.SetId( id );
 289
 290     m_size = 0;
 291     m_data = (void *)NULL;
 292 }
 293
 294 void wxPrivateDataObject::SetData( const void *data, size_t size )
 295 {
 296     Free();
 297
 298     m_size = size;
 299     m_data = malloc(size);
 300
 301     memcpy( m_data, data, size );
 302 }
 303
 304 void wxPrivateDataObject::WriteData( void *dest ) const
 305 {
 306     WriteData( m_data, dest );
 307 }
 308
 309 size_t wxPrivateDataObject::GetSize() const
 310 {
 311     return m_size;
 312 }
 313
 314 void wxPrivateDataObject::WriteData( const void *data, void *dest ) const
 315 {
 316     memcpy( dest, data, GetSize() );
 317 }
 318