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 #if wxUSE_CLIPBOARD
  17
  18 #include "glib.h"
  19 #include "gdk/gdk.h"
  20 #include "gtk/gtk.h"
  21
  22 //-----------------------------------------------------------------------------
  23 // data
  24 //-----------------------------------------------------------------------------
  25
  26 wxClipboard *wxTheClipboard = (wxClipboard*) NULL;
  27
  28 GdkAtom  g_textAtom        = 0;
  29 GdkAtom  g_clipboardAtom   = 0;
  30 GdkAtom  g_targetsAtom     = 0;
  31
  32 //-----------------------------------------------------------------------------
  33 // reminder
  34 //-----------------------------------------------------------------------------
  35
  36 /* The contents of a selection are returned in a GtkSelectionData
  37    structure. selection/target identify the request.
  38    type specifies the type of the return; if length < 0, and
  39    the data should be ignored. This structure has object semantics -
  40    no fields should be modified directly, they should not be created
  41    directly, and pointers to them should not be stored beyond the duration of
  42    a callback. (If the last is changed, we'll need to add reference
  43    counting)
  44
  45 struct _GtkSelectionData
  46 {
  47   GdkAtom selection;
  48   GdkAtom target;
  49   GdkAtom type;
  50   gint    format;
  51   guchar *data;
  52   gint    length;
  53 };
  54
  55 */
  56
  57 //-----------------------------------------------------------------------------
  58 // "selection_received" for targets
  59 //-----------------------------------------------------------------------------
  60
  61 static void
  62 targets_selection_received( GtkWidget *WXUNUSED(widget),
  63                             GtkSelectionData *selection_data,
  64                             wxClipboard *clipboard )
  65 {
  66     if (!wxTheClipboard) return;
  67
  68     if (selection_data->length <= 0) return;
  69
  70     // make sure we got the data in the correct form
  71     if (selection_data->type != GDK_SELECTION_TYPE_ATOM) return;
  72
  73     // the atoms we received, holding a list of targets (= formats)
  74     GdkAtom *atoms = (GdkAtom *)selection_data->data;
  75
  76     for (unsigned int i=0; i<selection_data->length/sizeof(GdkAtom); i++)
  77     {
  78         if (atoms[i] == clipboard->m_targetRequested)
  79         {
  80             clipboard->m_formatSupported = TRUE;
  81             return;
  82         }
  83     }
  84
  85     return;
  86 }
  87
  88 //-----------------------------------------------------------------------------
  89 // "selection_received" for the actual data
  90 //-----------------------------------------------------------------------------
  91
  92 static void
  93 selection_received( GtkWidget *WXUNUSED(widget),
  94                     GtkSelectionData *selection_data,
  95                     wxClipboard *clipboard )
  96 {
  97     if (!wxTheClipboard) return;
  98
  99     wxDataObject *data_object = clipboard->m_receivedData;
 100
 101     if (!data_object) return;
 102
 103     if (selection_data->length <= 0) return;
 104
 105     // make sure we got the data in the correct format
 106
 107     if (data_object->GetFormat().GetAtom() != selection_data->target) return;
 108
 109     // make sure we got the data in the correct form (selection type).
 110     // if so, copy data to target object
 111
 112     switch (data_object->GetFormat().GetType())
 113     {
 114         case wxDF_TEXT:
 115         {
 116             if (selection_data->type != GDK_SELECTION_TYPE_STRING) return;
 117
 118             wxTextDataObject *text_object = (wxTextDataObject *) data_object;
 119
 120             wxString text = (const char*) selection_data->data;
 121
 122             text_object->SetText( text );
 123
 124             break;
 125         }
 126
 127         case wxDF_BITMAP:
 128         {
 129             if (selection_data->type != GDK_SELECTION_TYPE_BITMAP) return;
 130
 131             return;
 132
 133             break;
 134         }
 135
 136         case wxDF_PRIVATE:
 137         {
 138             if (selection_data->type != GDK_SELECTION_TYPE_STRING) return;
 139
 140             wxPrivateDataObject *private_object = (wxPrivateDataObject *) data_object;
 141
 142             private_object->SetData( (const char*) selection_data->data, (size_t) selection_data->length );
 143
 144             break;
 145         }
 146
 147         default:
 148         {
 149             return;
 150         }
 151     }
 152
 153     wxTheClipboard->m_formatSupported = TRUE;
 154 }
 155
 156 //-----------------------------------------------------------------------------
 157 // "selection_clear"
 158 //-----------------------------------------------------------------------------
 159
 160 static gint
 161 selection_clear_clip( GtkWidget *WXUNUSED(widget), GdkEventSelection *event )
 162 {
 163     if (!wxTheClipboard) return TRUE;
 164
 165     if (event->selection == GDK_SELECTION_PRIMARY)
 166     {
 167         wxTheClipboard->m_ownsPrimarySelection = FALSE;
 168     }
 169     else
 170     if (event->selection == g_clipboardAtom)
 171     {
 172         wxTheClipboard->m_ownsClipboard = FALSE;
 173     }
 174     else
 175     {
 176         return FALSE;
 177     }
 178
 179     if ((!wxTheClipboard->m_ownsPrimarySelection) &&
 180         (!wxTheClipboard->m_ownsClipboard))
 181     {
 182         /* the clipboard is no longer in our hands. we can the  clipboard data. */
 183
 184         if (wxTheClipboard->m_dataBroker)
 185         {
 186             delete wxTheClipboard->m_dataBroker;
 187             wxTheClipboard->m_dataBroker = (wxDataBroker*) NULL;
 188         }
 189     }
 190
 191     return TRUE;
 192 }
 193
 194 //-----------------------------------------------------------------------------
 195 // selection handler for supplying data
 196 //-----------------------------------------------------------------------------
 197
 198 static void
 199 selection_handler( GtkWidget *WXUNUSED(widget), GtkSelectionData *selection_data, gpointer WXUNUSED(data) )
 200 {
 201     if (!wxTheClipboard) return;
 202
 203     if (!wxTheClipboard->m_dataBroker) return;
 204
 205     wxNode *node = wxTheClipboard->m_dataBroker->m_dataObjects.First();
 206
 207     while (node)
 208     {
 209         wxDataObject *data_object = (wxDataObject *)node->Data();
 210
 211         if (data_object->GetFormat().GetAtom() != selection_data->target)
 212         {
 213             node = node->Next();
 214             break;
 215         }
 216
 217         switch (data_object->GetFormat().GetType())
 218         {
 219             case wxDF_TEXT:
 220             {
 221                 wxTextDataObject *text_object = (wxTextDataObject*) data_object;
 222
 223                 wxString text = text_object->GetText();
 224
 225                 char *s = WXSTRINGCAST text;
 226                 int len = (int) text.Length();
 227
 228                 gtk_selection_data_set(
 229                     selection_data,
 230                     GDK_SELECTION_TYPE_STRING,
 231                     8*sizeof(gchar),
 232                     (unsigned char*) s,
 233                     len );
 234
 235                 break;
 236             }
 237
 238             case wxDF_BITMAP:
 239             {
 240                 // wxBitmapDataObject *private_object = (wxBitmapDataObject*) data_object;
 241
 242                 // how do we do that ?
 243
 244                 break;
 245             }
 246
 247             case wxDF_PRIVATE:
 248             {
 249                 wxPrivateDataObject *private_object = (wxPrivateDataObject*) data_object;
 250
 251                 if (private_object->GetSize() == 0) return;
 252
 253                 gtk_selection_data_set(
 254                     selection_data,
 255                     GDK_SELECTION_TYPE_STRING,
 256                     8*sizeof(gchar),
 257                     (unsigned char*) private_object->GetData(),
 258                     (int) private_object->GetSize() );
 259             }
 260
 261             default:
 262               break;
 263         }
 264
 265         node = node->Next();
 266     }
 267 }
 268
 269 //-----------------------------------------------------------------------------
 270 // wxClipboard
 271 //-----------------------------------------------------------------------------
 272
 273 IMPLEMENT_DYNAMIC_CLASS(wxClipboard,wxObject)
 274
 275 wxClipboard::wxClipboard()
 276 {
 277     m_open = FALSE;
 278
 279     m_ownsClipboard = FALSE;
 280     m_ownsPrimarySelection = FALSE;
 281
 282     m_dataBroker = (wxDataBroker*) NULL;
 283
 284     m_receivedData = (wxDataObject*) NULL;
 285
 286     m_clipboardWidget = gtk_window_new( GTK_WINDOW_POPUP );
 287     gtk_widget_realize( m_clipboardWidget );
 288
 289     gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
 290                         "selection_clear_event",
 291                         GTK_SIGNAL_FUNC( selection_clear_clip ),
 292                         (gpointer) NULL );
 293
 294     if (!g_clipboardAtom) g_clipboardAtom = gdk_atom_intern( "CLIPBOARD", FALSE );
 295     if (!g_textAtom) g_textAtom = gdk_atom_intern( "TEXT", FALSE );
 296     if (!g_targetsAtom) g_targetsAtom = gdk_atom_intern ("TARGETS", FALSE);
 297
 298     m_formatSupported = FALSE;
 299     m_targetRequested = 0;
 300 }
 301
 302 wxClipboard::~wxClipboard()
 303 {
 304     Clear();
 305
 306     if (m_clipboardWidget) gtk_widget_destroy( m_clipboardWidget );
 307 }
 308
 309 void wxClipboard::Clear()
 310 {
 311     if (m_dataBroker)
 312     {
 313         /*  As we have data we also own the clipboard. Once we no longer own
 314             it, clear_selection is called which will set m_data to zero */
 315
 316         if (gdk_selection_owner_get( g_clipboardAtom ) == m_clipboardWidget->window)
 317         {
 318             gtk_selection_owner_set( (GtkWidget*) NULL, g_clipboardAtom, GDK_CURRENT_TIME );
 319         }
 320
 321         if (gdk_selection_owner_get( GDK_SELECTION_PRIMARY ) == m_clipboardWidget->window)
 322         {
 323             gtk_selection_owner_set( (GtkWidget*) NULL, GDK_SELECTION_PRIMARY, GDK_CURRENT_TIME );
 324         }
 325
 326         if (m_dataBroker)
 327         {
 328             delete m_dataBroker;
 329             m_dataBroker = (wxDataBroker*) NULL;
 330         }
 331     }
 332
 333     m_targetRequested = 0;
 334
 335     m_formatSupported = FALSE;
 336 }
 337
 338 bool wxClipboard::Open()
 339 {
 340     wxCHECK_MSG( !m_open, FALSE, "clipboard already open" );
 341
 342     m_open = TRUE;
 343
 344     return TRUE;
 345 }
 346
 347 bool wxClipboard::SetData( wxDataObject *data )
 348 {
 349     wxCHECK_MSG( m_open, FALSE, "clipboard not open" );
 350
 351     wxCHECK_MSG( data, FALSE, "data is invalid" );
 352
 353     Clear();
 354
 355     return AddData( data );
 356 }
 357
 358 bool wxClipboard::AddData( wxDataObject *data )
 359 {
 360     wxCHECK_MSG( m_open, FALSE, "clipboard not open" );
 361
 362     wxCHECK_MSG( data, FALSE, "data is invalid" );
 363
 364     /* if clipboard has been cleared before, create new data broker */
 365
 366     if (!m_dataBroker) m_dataBroker = new wxDataBroker();
 367
 368     /* add new data to list of offered data objects */
 369
 370     m_dataBroker->Add( data );
 371
 372     /* get native format id of new data object */
 373
 374     GdkAtom format = data->GetFormat().GetAtom();
 375
 376     wxCHECK_MSG( format, FALSE, "data has invalid format" );
 377
 378     /* This should happen automatically, but to be on the safe side */
 379
 380     m_ownsClipboard = FALSE;
 381     m_ownsPrimarySelection = FALSE;
 382
 383     /* Add handlers if someone requests data */
 384
 385     gtk_selection_add_handler( m_clipboardWidget,
 386                                g_clipboardAtom,
 387                                format,
 388                                selection_handler,
 389                                (gpointer) NULL );
 390
 391     gtk_selection_add_handler( m_clipboardWidget,
 392                                GDK_SELECTION_PRIMARY,
 393                                format,
 394                                selection_handler,
 395                                (gpointer) NULL );
 396
 397     /* Tell the world we offer clipboard data */
 398
 399     if (!gtk_selection_owner_set( m_clipboardWidget,
 400                                   g_clipboardAtom,
 401                                   GDK_CURRENT_TIME ))
 402     {
 403         return FALSE;
 404     }
 405     m_ownsClipboard = TRUE;
 406
 407     if (!gtk_selection_owner_set( m_clipboardWidget,
 408                                   GDK_SELECTION_PRIMARY,
 409                                   GDK_CURRENT_TIME ))
 410     {
 411         return FALSE;
 412     }
 413     m_ownsPrimarySelection = TRUE;
 414
 415     return TRUE;
 416 }
 417
 418 void wxClipboard::Close()
 419 {
 420     wxCHECK_RET( m_open, "clipboard not open" );
 421
 422     m_open = FALSE;
 423 }
 424
 425 bool wxClipboard::IsSupported( wxDataObject &data )
 426 {
 427     wxCHECK_MSG( m_open, FALSE, "clipboard not open" );
 428
 429     /* store requested format to be asked for by callbacks */
 430
 431     m_targetRequested = data.GetFormat().GetAtom();
 432
 433     wxCHECK_MSG( m_targetRequested, FALSE, "invalid clipboard format" );
 434
 435     /* add handler for target (= format) query */
 436
 437     gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
 438                         "selection_received",
 439                         GTK_SIGNAL_FUNC( targets_selection_received ),
 440                         (gpointer) this );
 441
 442     m_formatSupported = FALSE;
 443
 444     /* perform query. this will set m_formatSupported to
 445      * TRUE if m_targetRequested is supported */
 446
 447     gtk_selection_convert( m_clipboardWidget,
 448                            g_clipboardAtom,
 449                            g_targetsAtom,
 450                            GDK_CURRENT_TIME );
 451
 452     gtk_signal_disconnect_by_func( GTK_OBJECT(m_clipboardWidget),
 453                                    GTK_SIGNAL_FUNC( targets_selection_received ),
 454                                    (gpointer) this );
 455
 456     if (!m_formatSupported) return FALSE;
 457
 458     return TRUE;
 459 }
 460
 461 bool wxClipboard::GetData( wxDataObject &data )
 462 {
 463     wxCHECK_MSG( m_open, FALSE, "clipboard not open" );
 464
 465     /* is data supported by clipboard ? */
 466
 467     if (!IsSupported( data )) return FALSE;
 468
 469     /* store pointer to data object to be filled up by callbacks */
 470
 471     m_receivedData = &data;
 472
 473     /* store requested format to be asked for by callbacks */
 474
 475     m_targetRequested = data.GetFormat().GetAtom();
 476
 477     wxCHECK_MSG( m_targetRequested, FALSE, "invalid clipboard format" );
 478
 479     /* start query */
 480
 481     m_formatSupported = FALSE;
 482
 483     gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
 484                         "selection_received",
 485                         GTK_SIGNAL_FUNC( selection_received ),
 486                         (gpointer) this );
 487
 488     /* ask for clipboard contents */
 489
 490     gtk_selection_convert( m_clipboardWidget,
 491                            g_clipboardAtom,
 492                            m_targetRequested,
 493                            GDK_CURRENT_TIME );
 494
 495     gtk_signal_disconnect_by_func( GTK_OBJECT(m_clipboardWidget),
 496                                    GTK_SIGNAL_FUNC( selection_received ),
 497                                    (gpointer) this );
 498
 499     /* this is a true error as we checked for the presence of such data before */
 500
 501     wxCHECK_MSG( m_formatSupported, FALSE, "error retrieving data from clipboard" );
 502
 503     return TRUE;
 504 }
 505
 506 //-----------------------------------------------------------------------------
 507 // wxClipboardModule
 508 //-----------------------------------------------------------------------------
 509
 510 IMPLEMENT_DYNAMIC_CLASS(wxClipboardModule,wxModule)
 511
 512 bool wxClipboardModule::OnInit()
 513 {
 514     wxTheClipboard = new wxClipboard();
 515
 516     return TRUE;
 517 }
 518
 519 void wxClipboardModule::OnExit()
 520 {
 521     if (wxTheClipboard) delete wxTheClipboard;
 522     wxTheClipboard = (wxClipboard*) NULL;
 523 }
 524
 525 #endif
 526
 527   // wxUSE_CLIPBOARD
 528