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
 140
 141   gint len = data_object->GetDataSize();
 142   guchar *bin_data = (guchar*) malloc( len );
 143   data_object->GetDataHere( (void*)bin_data );
 144
 145   if (selection_data->target == GDK_TARGET_STRING)
 146   {
 147     gtk_selection_data_set(
 148       selection_data, GDK_SELECTION_TYPE_STRING, 8*sizeof(gchar), bin_data, len );
 149   }
 150 /*
 151   else if (selection_data->target == g_textAtom)
 152   {
 153     gtk_selection_data_set(
 154       selection_data, g_textAtom, 8*sizeof(gchar), bin_data, len );
 155   }
 156 */
 157   free( bin_data );
 158 }
 159
 160 //-----------------------------------------------------------------------------
 161 // wxClipboard
 162 //-----------------------------------------------------------------------------
 163
 164 IMPLEMENT_DYNAMIC_CLASS(wxClipboard,wxObject)
 165
 166 wxClipboard::wxClipboard()
 167 {
 168   m_data = (wxDataObject*) NULL;
 169
 170   m_clipboardWidget = gtk_window_new( GTK_WINDOW_POPUP );
 171   gtk_widget_realize( m_clipboardWidget );
 172
 173   gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
 174                       "selection_clear_event",
 175                       GTK_SIGNAL_FUNC( selection_clear ),
 176                       (gpointer) NULL );
 177
 178   if (!g_clipboardAtom) g_clipboardAtom = gdk_atom_intern( "CLIPBOARD", FALSE );
 179   if (!g_textAtom) g_textAtom = gdk_atom_intern( "TEXT", FALSE );
 180   if (!g_targetsAtom) g_targetsAtom = gdk_atom_intern ("TARGETS", FALSE);
 181
 182   m_receivedData = (char*)NULL;
 183   m_receivedSize = 0;
 184   m_formatSupported = FALSE;
 185   m_targetRequested = 0;
 186 }
 187
 188 wxClipboard::~wxClipboard()
 189 {
 190   Clear();
 191
 192   if (m_clipboardWidget) gtk_widget_destroy( m_clipboardWidget );
 193 }
 194
 195 void wxClipboard::Clear()
 196 {
 197   /* As we have data we also own the clipboard. Once we no longer own
 198      it, clear_selection is called which will set m_data to zero */
 199
 200   if (m_data)
 201   {
 202     if (gdk_selection_owner_get( g_clipboardAtom) == m_clipboardWidget->window)
 203     {
 204         gtk_selection_owner_set( (GtkWidget*) NULL, g_clipboardAtom, GDK_CURRENT_TIME );
 205     }
 206
 207     delete m_data;
 208     m_data = (wxDataObject*) NULL;
 209   }
 210
 211   m_receivedSize = 0;
 212
 213   if (m_receivedData)
 214   {
 215     delete[] m_receivedData;
 216     m_receivedData = (char*) NULL;
 217   }
 218
 219   m_targetRequested = 0;
 220
 221   m_formatSupported = FALSE;
 222 }
 223
 224 void wxClipboard::SetData( wxDataObject *data )
 225 {
 226   Clear();
 227
 228 /*
 229    GTK 1.0.X cannot remove a target from a widget so if a widget
 230    at first offers text and then a bitmap (and no longer text) to
 231    the clipboard, we seem too have to delete it.
 232 */
 233
 234   if (m_clipboardWidget) gtk_widget_destroy( m_clipboardWidget );
 235
 236   m_clipboardWidget = gtk_window_new( GTK_WINDOW_POPUP );
 237   gtk_widget_realize( m_clipboardWidget );
 238
 239   if (m_data) delete m_data;
 240   m_data = data;
 241   if (!m_data) return;
 242
 243   if (!gtk_selection_owner_set( m_clipboardWidget,
 244                                 g_clipboardAtom,
 245                                 GDK_CURRENT_TIME))
 246   {
 247     delete m_data;
 248     m_data = (wxDataObject*) NULL;
 249     return;
 250   }
 251
 252   switch (m_data->GetPreferredFormat())
 253   {
 254     case wxDF_TEXT:
 255       gtk_selection_add_handler( m_clipboardWidget,
 256                                  g_clipboardAtom,
 257                                 // g_textAtom,
 258                                  GDK_TARGET_STRING,
 259                                  selection_handler,
 260                                  NULL );
 261       break;
 262     default:
 263       break;
 264   }
 265 }
 266
 267 bool wxClipboard::IsSupportedFormat( wxDataFormat format )
 268 {
 269   m_targetRequested = 0;
 270
 271   if (format == wxDF_TEXT)
 272   {
 273 //     m_targetRequested = g_textAtom;
 274      m_targetRequested = GDK_TARGET_STRING;
 275   }
 276
 277   if (m_targetRequested == 0) return FALSE;
 278
 279   gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
 280                       "selection_received",
 281                       GTK_SIGNAL_FUNC( targets_selection_received ),
 282                       (gpointer) this );
 283
 284   m_formatSupported = FALSE;
 285
 286   gtk_selection_convert( m_clipboardWidget,
 287                          g_clipboardAtom,
 288                          g_targetsAtom,
 289                          GDK_CURRENT_TIME );
 290
 291   gtk_signal_disconnect_by_func( GTK_OBJECT(m_clipboardWidget),
 292                                  GTK_SIGNAL_FUNC( targets_selection_received ),
 293                                  (gpointer) this );
 294
 295   if (!m_formatSupported) return FALSE;
 296
 297   return TRUE;
 298 }
 299
 300 bool wxClipboard::ObtainData( wxDataFormat format )
 301 {
 302   m_receivedSize = 0;
 303
 304   if (m_receivedData)
 305   {
 306     delete[] m_receivedData;
 307     m_receivedData = (char*) NULL;
 308   }
 309
 310   m_targetRequested = 0;
 311
 312   if (format == wxDF_TEXT)
 313   {
 314 //     m_targetRequested = g_textAtom;
 315      m_targetRequested = GDK_TARGET_STRING;
 316   }
 317
 318   if (m_targetRequested == 0) return FALSE;
 319
 320   gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
 321                       "selection_received",
 322                       GTK_SIGNAL_FUNC( selection_received ),
 323                       (gpointer) this );
 324
 325   gtk_selection_convert( m_clipboardWidget,
 326                          g_clipboardAtom,
 327                          m_targetRequested,
 328                          GDK_CURRENT_TIME );
 329
 330   gtk_signal_disconnect_by_func( GTK_OBJECT(m_clipboardWidget),
 331                                  GTK_SIGNAL_FUNC( selection_received ),
 332                                  (gpointer) this );
 333
 334   if (m_receivedSize == 0) return FALSE;
 335
 336   return TRUE;
 337 }
 338
 339 size_t wxClipboard::GetDataSize() const
 340 {
 341   return m_receivedSize;
 342 }
 343
 344 void wxClipboard::GetDataHere( void *data ) const
 345 {
 346   memcpy(data, m_receivedData, m_receivedSize );
 347 }
 348
 349 //-----------------------------------------------------------------------------
 350 // wxClipboardModule
 351 //-----------------------------------------------------------------------------
 352
 353 IMPLEMENT_DYNAMIC_CLASS(wxClipboardModule,wxModule)
 354
 355 bool wxClipboardModule::OnInit()
 356 {
 357   wxTheClipboard = new wxClipboard();
 358
 359   return TRUE;
 360 }
 361
 362 void wxClipboardModule::OnExit()
 363 {
 364   if (wxTheClipboard) delete wxTheClipboard;
 365   wxTheClipboard = (wxClipboard*) NULL;
 366 }