src/gtk/clipbrd.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        clipbrd.cpp
   3 // Purpose:
   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 "clipbrd.h"
  12 #endif
  13
  14 #include "wx/clipbrd.h"
  15
  16 //-----------------------------------------------------------------------------
  17 // data
  18 //-----------------------------------------------------------------------------
  19
  20 wxClipboard *wxTheClipboard = (wxClipboard*) NULL;
  21
  22 GdkAtom  g_textAtom        = 0;
  23 GdkAtom  g_clipboardAtom   = 0;
  24 GdkAtom  g_targetsAtom     = 0;
  25
  26 //-----------------------------------------------------------------------------
  27 // reminder
  28 //-----------------------------------------------------------------------------
  29
  30 /* The contents of a selection are returned in a GtkSelectionData
  31    structure. selection/target identify the request.
  32    type specifies the type of the return; if length < 0, and
  33    the data should be ignored. This structure has object semantics -
  34    no fields should be modified directly, they should not be created
  35    directly, and pointers to them should not be stored beyond the duration of
  36    a callback. (If the last is changed, we'll need to add reference
  37    counting)
  38
  39 struct _GtkSelectionData
  40 {
  41   GdkAtom selection;
  42   GdkAtom target;
  43   GdkAtom type;
  44   gint    format;
  45   guchar *data;
  46   gint    length;
  47 };
  48
  49 */
  50
  51 //-----------------------------------------------------------------------------
  52 // "selection_received" for targets
  53 //-----------------------------------------------------------------------------
  54
  55 static void
  56 targets_selection_received( GtkWidget *WXUNUSED(widget),
  57                             GtkSelectionData *selection_data,
  58                             wxClipboard *clipboard )
  59 {
  60   if (!wxTheClipboard) return;
  61
  62   if (selection_data->length <= 0) return;
  63
  64   // make sure we got the data in the correct form
  65   if (selection_data->type != GDK_SELECTION_TYPE_ATOM) return;
  66
  67   // the atoms we received, holding a list of targets (= formats)
  68   GdkAtom *atoms = (GdkAtom *)selection_data->data;
  69
  70   for (unsigned int i=0; i<selection_data->length/sizeof(GdkAtom); i++)
  71   {
  72      if (atoms[i] == clipboard->m_targetRequested)
  73      {
  74        clipboard->m_formatSupported = TRUE;
  75        return;
  76      }
  77   }
  78
  79   return;
  80 }
  81
  82 //-----------------------------------------------------------------------------
  83 // "selection_received" for the actual data
  84 //-----------------------------------------------------------------------------
  85
  86 static void
  87 selection_received( GtkWidget *WXUNUSED(widget),
  88                     GtkSelectionData *selection_data,
  89                     wxClipboard *clipboard )
  90 {
  91   if (!wxTheClipboard) return;
  92
  93   if (selection_data->length <= 0) return;
  94
  95   size_t size = (size_t) selection_data->length;
  96
  97   // make sure we got the data in the correct form
  98   if (selection_data->type != GDK_SELECTION_TYPE_STRING) return;
  99
 100   clipboard->m_receivedSize = size;
 101
 102   clipboard->m_receivedData = new char[size+1];
 103
 104   memcpy( clipboard->m_receivedData, selection_data->data, size);
 105 }
 106
 107 //-----------------------------------------------------------------------------
 108 // "selection_clear"
 109 //-----------------------------------------------------------------------------
 110
 111 static gint
 112 selection_clear( GtkWidget *WXUNUSED(widget), GdkEventSelection *WXUNUSED(event) )
 113 {
 114   if (!wxTheClipboard) return TRUE;
 115
 116   /* the clipboard is no longer in our hands. we can delete the
 117    * clipboard data. I hope I got that one right... */
 118
 119   wxTheClipboard->SetData( (wxDataObject*) NULL );
 120
 121   return TRUE;
 122 }
 123
 124 //-----------------------------------------------------------------------------
 125 // selection handler for supplying data
 126 //-----------------------------------------------------------------------------
 127
 128 static void
 129 selection_handler( GtkWidget *WXUNUSED(widget), GtkSelectionData *selection_data, gpointer WXUNUSED(data) )
 130 {
 131   if (!wxTheClipboard) return;
 132
 133   wxDataObject *data_object = wxTheClipboard->m_data;
 134
 135   if (!data_object) return;
 136
 137   if (data_object->GetDataSize() == 0) return;
 138
 139   gint len = data_object->GetDataSize();
 140   guchar *bin_data = (guchar*) malloc( len );
 141   data_object->GetDataHere( (void*)bin_data );
 142
 143   if (selection_data->target == GDK_SELECTION_TYPE_STRING)
 144   {
 145     gtk_selection_data_set(
 146       selection_data, GDK_SELECTION_TYPE_STRING, 8*sizeof(gchar), bin_data, len );
 147   }
 148   else if (selection_data->target == g_textAtom)
 149   {
 150     gtk_selection_data_set(
 151       selection_data, g_textAtom, 8*sizeof(gchar), bin_data, len );
 152   }
 153   free( bin_data );
 154 }
 155
 156 //-----------------------------------------------------------------------------
 157 // wxClipboard
 158 //-----------------------------------------------------------------------------
 159
 160 IMPLEMENT_DYNAMIC_CLASS(wxClipboard,wxObject)
 161
 162 wxClipboard::wxClipboard()
 163 {
 164   m_data = (wxDataObject*) NULL;
 165   m_clipboardWidget = gtk_window_new( GTK_WINDOW_POPUP );
 166   gtk_widget_realize( m_clipboardWidget );
 167
 168   gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
 169                       "selection_clear_event",
 170                       GTK_SIGNAL_FUNC( selection_clear ),
 171                       (gpointer) NULL );
 172
 173   if (!g_clipboardAtom) g_clipboardAtom = gdk_atom_intern( "CLIPBOARD", FALSE );
 174   if (!g_textAtom) g_textAtom = gdk_atom_intern( "TEXT", FALSE );
 175   if (!g_targetsAtom) g_targetsAtom = gdk_atom_intern ("TARGETS", FALSE);
 176
 177   m_receivedData = (char*)NULL;
 178   m_receivedSize = 0;
 179   m_formatSupported = FALSE;
 180   m_targetRequested = 0;
 181 }
 182
 183 wxClipboard::~wxClipboard()
 184 {
 185   Clear();
 186
 187   if (m_clipboardWidget) gtk_widget_destroy( m_clipboardWidget );
 188 }
 189
 190 void wxClipboard::Clear()
 191 {
 192   /* As we have data we also own the clipboard. Once we no longer own
 193      it, clear_selection is called which will set m_data to zero */
 194
 195   if (m_data)
 196   {
 197     delete m_data;
 198     gtk_selection_owner_set( (GtkWidget*) NULL, GDK_SELECTION_PRIMARY, GDK_CURRENT_TIME );
 199   }
 200
 201   m_receivedSize = 0;
 202
 203   if (m_receivedData)
 204   {
 205     delete[] m_receivedData;
 206     m_receivedData = (char*) NULL;
 207   }
 208
 209   m_targetRequested = 0;
 210
 211   m_formatSupported = FALSE;
 212 }
 213
 214 void wxClipboard::SetData( wxDataObject *data )
 215 {
 216   if (m_data) delete m_data;
 217   m_data = data;
 218   if (!m_data) return;
 219
 220   if (!gtk_selection_owner_set( m_clipboardWidget,
 221                                 g_clipboardAtom,
 222                                 GDK_CURRENT_TIME))
 223   {
 224     delete m_data;
 225     m_data = (wxDataObject*) NULL;
 226     return;
 227   }
 228
 229   switch (m_data->GetPreferredFormat())
 230   {
 231     case wxDF_TEXT:
 232       gtk_selection_add_handler( m_clipboardWidget,
 233                                  g_clipboardAtom,
 234                                  g_textAtom,
 235                                  selection_handler,
 236                                  NULL );
 237       break;
 238     default:
 239       break;
 240   }
 241 }
 242
 243 bool wxClipboard::IsSupportedFormat( wxDataFormat format )
 244 {
 245   m_targetRequested = 0;
 246
 247   if (format == wxDF_TEXT)
 248   {
 249 //     m_targetRequested = g_textAtom;
 250      m_targetRequested = GDK_TARGET_STRING;
 251   }
 252
 253   if (m_targetRequested == 0) return FALSE;
 254
 255   gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
 256                       "selection_received",
 257                       GTK_SIGNAL_FUNC( targets_selection_received ),
 258                       (gpointer) this );
 259
 260   m_formatSupported = FALSE;
 261
 262   gtk_selection_convert( m_clipboardWidget,
 263                          g_clipboardAtom,
 264                          g_targetsAtom,
 265                          GDK_CURRENT_TIME );
 266
 267   gtk_signal_disconnect_by_func( GTK_OBJECT(m_clipboardWidget),
 268                                  GTK_SIGNAL_FUNC( targets_selection_received ),
 269                                  (gpointer) this );
 270
 271   if (!m_formatSupported) return FALSE;
 272
 273   return TRUE;
 274 }
 275
 276 bool wxClipboard::ObtainData( wxDataFormat format )
 277 {
 278   m_receivedSize = 0;
 279
 280   if (m_receivedData)
 281   {
 282     delete[] m_receivedData;
 283     m_receivedData = (char*) NULL;
 284   }
 285
 286   m_targetRequested = 0;
 287
 288   if (format == wxDF_TEXT)
 289   {
 290 //     m_targetRequested = g_textAtom;
 291      m_targetRequested = GDK_TARGET_STRING;
 292   }
 293
 294   if (m_targetRequested == 0) return FALSE;
 295
 296   gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
 297                       "selection_received",
 298                       GTK_SIGNAL_FUNC( selection_received ),
 299                       (gpointer) this );
 300
 301   gtk_selection_convert( m_clipboardWidget,
 302                          g_clipboardAtom,
 303                          m_targetRequested,
 304                          GDK_CURRENT_TIME );
 305
 306   gtk_signal_disconnect_by_func( GTK_OBJECT(m_clipboardWidget),
 307                                  GTK_SIGNAL_FUNC( selection_received ),
 308                                  (gpointer) this );
 309
 310   if (m_receivedSize == 0) return FALSE;
 311
 312   return TRUE;
 313 }
 314
 315 size_t wxClipboard::GetDataSize() const
 316 {
 317   return m_receivedSize;
 318 }
 319
 320 void wxClipboard::GetDataHere( void *data ) const
 321 {
 322   memcpy(data, m_receivedData, m_receivedSize );
 323 }
 324
 325 //-----------------------------------------------------------------------------
 326 // wxClipboardModule
 327 //-----------------------------------------------------------------------------
 328
 329 IMPLEMENT_DYNAMIC_CLASS(wxClipboardModule,wxModule)
 330
 331 bool wxClipboardModule::OnInit()
 332 {
 333   wxTheClipboard = new wxClipboard();
 334
 335   return TRUE;
 336 }
 337
 338 void wxClipboardModule::OnExit()
 339 {
 340   if (wxTheClipboard) delete wxTheClipboard;
 341   wxTheClipboard = (wxClipboard*) NULL;
 342 }