src/x11/clipbrd.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/x11/clipbrd.cpp
   3 // Purpose:     Clipboard functionality
   4 // Author:      Robert Roebling
   5 // Created:
   6 // RCS-ID:      $Id$
   7 // Copyright:   (c) Robert Roebling
   8 // Licence:     wxWindows licence
   9 /////////////////////////////////////////////////////////////////////////////
  10
  11 // for compilers that support precompilation, includes "wx.h".
  12 #include "wx/wxprec.h"
  13
  14 #if wxUSE_CLIPBOARD
  15
  16 #include "wx/clipbrd.h"
  17
  18 #ifndef WX_PRECOMP
  19     #include "wx/log.h"
  20     #include "wx/utils.h"
  21     #include "wx/dataobj.h"
  22 #endif
  23
  24 #include "wx/x11/private.h"
  25
  26 //-----------------------------------------------------------------------------
  27 // data
  28 //-----------------------------------------------------------------------------
  29
  30 #if !wxUSE_NANOX
  31 Atom  g_clipboardAtom   = 0;
  32 Atom  g_targetsAtom     = 0;
  33 #endif
  34
  35 // avoid warnings about unused static variable (notice that we still use it
  36 // even in release build if the compiler doesn't support variadic macros)
  37 #if defined(__WXDEBUG__) || !defined(HAVE_VARIADIC_MACROS)
  38
  39 // the trace mask we use with wxLogTrace() - call
  40 // wxLog::AddTraceMask(TRACE_CLIPBOARD) to enable the trace messages from here
  41 // (there will be a *lot* of them!)
  42 static const wxChar *TRACE_CLIPBOARD = _T("clipboard");
  43
  44 #endif // __WXDEBUG__
  45
  46 //-----------------------------------------------------------------------------
  47 // reminder
  48 //-----------------------------------------------------------------------------
  49
  50 /* The contents of a selection are returned in a GtkSelectionData
  51    structure. selection/target identify the request.
  52    type specifies the type of the return; if length < 0, and
  53    the data should be ignored. This structure has object semantics -
  54    no fields should be modified directly, they should not be created
  55    directly, and pointers to them should not be stored beyond the duration of
  56    a callback. (If the last is changed, we'll need to add reference
  57    counting)
  58
  59 struct _GtkSelectionData
  60 {
  61   GdkAtom selection;
  62   GdkAtom target;
  63   GdkAtom type;
  64   gint    format;
  65   guchar *data;
  66   gint    length;
  67 };
  68
  69 */
  70
  71 //-----------------------------------------------------------------------------
  72 // "selection_received" for targets
  73 //-----------------------------------------------------------------------------
  74
  75 #if 0
  76
  77 static void
  78 targets_selection_received( GtkWidget *WXUNUSED(widget),
  79                             GtkSelectionData *selection_data,
  80 #if (GTK_MINOR_VERSION > 0)
  81                             guint32 WXUNUSED(time),
  82 #endif
  83                             wxClipboard *clipboard )
  84 {
  85     if ( wxTheClipboard && selection_data->length > 0 )
  86     {
  87         /* make sure we got the data in the correct form */
  88         GdkAtom type = selection_data->type;
  89         if ( type != GDK_SELECTION_TYPE_ATOM )
  90         {
  91             if ( strcmp(gdk_atom_name(type), "TARGETS") )
  92             {
  93                 wxLogTrace( TRACE_CLIPBOARD,
  94                             _T("got unsupported clipboard target") );
  95
  96                 clipboard->m_waiting = false;
  97                 return;
  98             }
  99         }
 100
 101 #ifdef __WXDEBUG__
 102         wxDataFormat clip( selection_data->selection );
 103         wxLogTrace( TRACE_CLIPBOARD,
 104                     wxT("selection received for targets, clipboard %s"),
 105                     clip.GetId().c_str() );
 106 #endif // __WXDEBUG__
 107
 108         // the atoms we received, holding a list of targets (= formats)
 109         GdkAtom *atoms = (GdkAtom *)selection_data->data;
 110
 111         for (unsigned int i=0; i<selection_data->length/sizeof(GdkAtom); i++)
 112         {
 113             wxDataFormat format( atoms[i] );
 114
 115             wxLogTrace( TRACE_CLIPBOARD,
 116                         wxT("selection received for targets, format %s"),
 117                         format.GetId().c_str() );
 118
 119             if (format == clipboard->m_targetRequested)
 120             {
 121                 clipboard->m_waiting = false;
 122                 clipboard->m_formatSupported = true;
 123                 return;
 124             }
 125         }
 126     }
 127
 128     clipboard->m_waiting = false;
 129 }
 130
 131 //-----------------------------------------------------------------------------
 132 // "selection_received" for the actual data
 133 //-----------------------------------------------------------------------------
 134
 135 static void
 136 selection_received( GtkWidget *WXUNUSED(widget),
 137                     GtkSelectionData *selection_data,
 138 #if (GTK_MINOR_VERSION > 0)
 139                     guint32 WXUNUSED(time),
 140 #endif
 141                     wxClipboard *clipboard )
 142 {
 143     if (!wxTheClipboard)
 144     {
 145         clipboard->m_waiting = false;
 146         return;
 147     }
 148
 149     wxDataObject *data_object = clipboard->m_receivedData;
 150
 151     if (!data_object)
 152     {
 153         clipboard->m_waiting = false;
 154         return;
 155     }
 156
 157     if (selection_data->length <= 0)
 158     {
 159         clipboard->m_waiting = false;
 160         return;
 161     }
 162
 163     wxDataFormat format( selection_data->target );
 164
 165     /* make sure we got the data in the correct format */
 166     if (!data_object->IsSupportedFormat( format ) )
 167     {
 168         clipboard->m_waiting = false;
 169         return;
 170     }
 171
 172     /* make sure we got the data in the correct form (selection type).
 173        if so, copy data to target object */
 174     if (selection_data->type != GDK_SELECTION_TYPE_STRING)
 175     {
 176         clipboard->m_waiting = false;
 177         return;
 178     }
 179
 180     data_object->SetData( format, (size_t) selection_data->length, (const char*) selection_data->data );
 181
 182     wxTheClipboard->m_formatSupported = true;
 183     clipboard->m_waiting = false;
 184 }
 185
 186 //-----------------------------------------------------------------------------
 187 // "selection_clear"
 188 //-----------------------------------------------------------------------------
 189
 190 static gint
 191 selection_clear_clip( GtkWidget *WXUNUSED(widget), GdkEventSelection *event )
 192 {
 193     if (!wxTheClipboard) return TRUE;
 194
 195     if (event->selection == GDK_SELECTION_PRIMARY)
 196     {
 197         wxTheClipboard->m_ownsPrimarySelection = false;
 198     }
 199     else
 200     if (event->selection == g_clipboardAtom)
 201     {
 202         wxTheClipboard->m_ownsClipboard = false;
 203     }
 204     else
 205     {
 206         wxTheClipboard->m_waiting = false;
 207         return FALSE;
 208     }
 209
 210     if ((!wxTheClipboard->m_ownsPrimarySelection) &&
 211         (!wxTheClipboard->m_ownsClipboard))
 212     {
 213         /* the clipboard is no longer in our hands. we can the delete clipboard data. */
 214         if (wxTheClipboard->m_data)
 215         {
 216             wxLogTrace(TRACE_CLIPBOARD, wxT("wxClipboard will get cleared" ));
 217
 218             delete wxTheClipboard->m_data;
 219             wxTheClipboard->m_data = NULL;
 220         }
 221     }
 222
 223     wxTheClipboard->m_waiting = false;
 224     return TRUE;
 225 }
 226
 227 //-----------------------------------------------------------------------------
 228 // selection handler for supplying data
 229 //-----------------------------------------------------------------------------
 230
 231 static void
 232 selection_handler( GtkWidget *WXUNUSED(widget),
 233                    GtkSelectionData *selection_data,
 234                    guint WXUNUSED(info),
 235                    guint WXUNUSED(time),
 236                    gpointer WXUNUSED(data) )
 237 {
 238     if (!wxTheClipboard) return;
 239
 240     if (!wxTheClipboard->m_data) return;
 241
 242     wxDataObject *data = wxTheClipboard->m_data;
 243
 244     wxDataFormat format( selection_data->target );
 245
 246     if (!data->IsSupportedFormat( format )) return;
 247
 248     int size = data->GetDataSize( format );
 249
 250     if (size == 0) return;
 251
 252     void *d = malloc(size);
 253
 254     data->GetDataHere( selection_data->target, d );
 255
 256     // transform Unicode text into multibyte before putting it on clipboard
 257 #if wxUSE_UNICODE
 258     if ( format.GetType() == wxDF_TEXT || format.GetType() == wxDF_UNICODETEXT)
 259     {
 260         const wchar_t *wstr = (const wchar_t *)d;
 261         size_t len = wxConvCurrent->WC2MB(NULL, wstr, 0);
 262         char *str = malloc(len + 1);
 263         wxConvCurrent->WC2MB(str, wstr, len);
 264         str[len] = '\0';
 265
 266         free(d);
 267         d = str;
 268     }
 269 #endif // wxUSE_UNICODE
 270
 271     gtk_selection_data_set(
 272         selection_data,
 273         GDK_SELECTION_TYPE_STRING,
 274         8*sizeof(gchar),
 275         (unsigned char*) d,
 276         size );
 277
 278     free(d);
 279 }
 280
 281 #endif
 282
 283 //-----------------------------------------------------------------------------
 284 // wxClipboard
 285 //-----------------------------------------------------------------------------
 286
 287 IMPLEMENT_DYNAMIC_CLASS(wxClipboard,wxObject)
 288
 289 wxClipboard::wxClipboard()
 290 {
 291     m_open = false;
 292
 293     m_ownsClipboard = false;
 294     m_ownsPrimarySelection = false;
 295
 296     m_data = NULL;
 297     m_receivedData = NULL;
 298
 299     /* we use m_targetsWidget to query what formats are available */
 300
 301     /* we use m_clipboardWidget to get and to offer data */
 302 #if !wxUSE_NANOX
 303     if (!g_clipboardAtom) g_clipboardAtom = XInternAtom( (Display*) wxGetDisplay(), "CLIPBOARD", False );
 304     if (!g_targetsAtom) g_targetsAtom = XInternAtom( (Display*) wxGetDisplay(), "TARGETS", False );
 305 #endif
 306
 307     m_formatSupported = false;
 308     m_targetRequested = 0;
 309 }
 310
 311 wxClipboard::~wxClipboard()
 312 {
 313     Clear();
 314
 315 //    if (m_clipboardWidget) gtk_widget_destroy( m_clipboardWidget );
 316 //    if (m_targetsWidget) gtk_widget_destroy( m_targetsWidget );
 317 }
 318
 319 void wxClipboard::Clear()
 320 {
 321     if (m_data)
 322     {
 323 #if wxUSE_THREADS
 324         /* disable GUI threads */
 325 #endif
 326
 327         /*  As we have data we also own the clipboard. Once we no longer own
 328             it, clear_selection is called which will set m_data to zero */
 329 #if 0
 330         if (gdk_selection_owner_get( g_clipboardAtom ) == m_clipboardWidget->window)
 331         {
 332             m_waiting = true;
 333
 334             gtk_selection_owner_set( NULL, g_clipboardAtom,
 335                                      (guint32) GDK_CURRENT_TIME );
 336
 337             while (m_waiting) gtk_main_iteration();
 338         }
 339
 340         if (gdk_selection_owner_get( GDK_SELECTION_PRIMARY ) == m_clipboardWidget->window)
 341         {
 342             m_waiting = true;
 343
 344             gtk_selection_owner_set( NULL, GDK_SELECTION_PRIMARY,
 345                                      (guint32) GDK_CURRENT_TIME );
 346
 347             while (m_waiting) gtk_main_iteration();
 348         }
 349 #endif
 350
 351         if (m_data)
 352         {
 353             delete m_data;
 354             m_data = NULL;
 355         }
 356
 357 #if wxUSE_THREADS
 358         /* re-enable GUI threads */
 359 #endif
 360     }
 361
 362     m_targetRequested = 0;
 363     m_formatSupported = false;
 364 }
 365
 366 bool wxClipboard::Open()
 367 {
 368     wxCHECK_MSG( !m_open, false, wxT("clipboard already open") );
 369
 370     m_open = true;
 371
 372     return true;
 373 }
 374
 375 bool wxClipboard::SetData( wxDataObject *data )
 376 {
 377     wxCHECK_MSG( m_open, false, wxT("clipboard not open") );
 378
 379     wxCHECK_MSG( data, false, wxT("data is invalid") );
 380
 381     Clear();
 382
 383     return AddData( data );
 384 }
 385
 386 bool wxClipboard::AddData( wxDataObject *data )
 387 {
 388 #if wxUSE_NANOX
 389     return false;
 390 #else
 391     wxCHECK_MSG( m_open, false, wxT("clipboard not open") );
 392
 393     wxCHECK_MSG( data, false, wxT("data is invalid") );
 394
 395     /* we can only store one wxDataObject */
 396     Clear();
 397
 398     m_data = data;
 399
 400     /* get formats from wxDataObjects */
 401     wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
 402     m_data->GetAllFormats( array );
 403
 404 #if 0
 405     /* primary selection or clipboard */
 406     Atom clipboard = m_usePrimary ? (Atom) 1  // 1 = primary selection
 407                                   : g_clipboardAtom;
 408 #endif // 0
 409
 410
 411     for (size_t i = 0; i < m_data->GetFormatCount(); i++)
 412     {
 413         wxLogTrace( TRACE_CLIPBOARD,
 414                     wxT("wxClipboard now supports atom %s"),
 415                     array[i].GetId().c_str() );
 416
 417 #if 0
 418         gtk_selection_add_target( GTK_WIDGET(m_clipboardWidget),
 419                                   clipboard,
 420                                   array[i],
 421                                   0 );  /* what is info ? */
 422 #endif
 423     }
 424
 425     delete[] array;
 426
 427 #if 0
 428     gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
 429                         "selection_get",
 430                         GTK_SIGNAL_FUNC(selection_handler),
 431                         (gpointer) NULL );
 432 #endif
 433
 434 #if wxUSE_THREADS
 435     /* disable GUI threads */
 436 #endif
 437
 438     bool res = false;
 439 #if 0
 440     /* Tell the world we offer clipboard data */
 441     res = (gtk_selection_owner_set( m_clipboardWidget,
 442                                          clipboard,
 443                                          (guint32) GDK_CURRENT_TIME ));
 444 #endif
 445
 446     if (m_usePrimary)
 447         m_ownsPrimarySelection = res;
 448     else
 449         m_ownsClipboard = res;
 450
 451 #if wxUSE_THREADS
 452     /* re-enable GUI threads */
 453 #endif
 454
 455     return res;
 456 #endif
 457 }
 458
 459 void wxClipboard::Close()
 460 {
 461     wxCHECK_RET( m_open, wxT("clipboard not open") );
 462
 463     m_open = false;
 464 }
 465
 466 bool wxClipboard::IsOpened() const
 467 {
 468     return m_open;
 469 }
 470
 471 bool wxClipboard::IsSupported( const wxDataFormat& format )
 472 {
 473     /* reentrance problems */
 474     if (m_waiting) return false;
 475
 476     /* store requested format to be asked for by callbacks */
 477     m_targetRequested = format;
 478
 479 #if 0
 480     wxLogTrace( TRACE_CLIPBOARD,
 481                 wxT("wxClipboard:IsSupported: requested format: %s"),
 482                 format.GetId().c_str() );
 483 #endif
 484
 485     wxCHECK_MSG( m_targetRequested, false, wxT("invalid clipboard format") );
 486
 487     m_formatSupported = false;
 488
 489     /* perform query. this will set m_formatSupported to
 490        true if m_targetRequested is supported.
 491        also, we have to wait for the "answer" from the
 492        clipboard owner which is an asynchronous process.
 493        therefore we set m_waiting = true here and wait
 494        until the callback "targets_selection_received"
 495        sets it to false */
 496
 497     m_waiting = true;
 498
 499 #if 0
 500     gtk_selection_convert( m_targetsWidget,
 501                            m_usePrimary ? (GdkAtom)GDK_SELECTION_PRIMARY
 502                                         : g_clipboardAtom,
 503                            g_targetsAtom,
 504                            (guint32) GDK_CURRENT_TIME );
 505
 506     while (m_waiting) gtk_main_iteration();
 507 #endif
 508
 509     if (!m_formatSupported) return false;
 510
 511     return true;
 512 }
 513
 514 bool wxClipboard::GetData( wxDataObject& data )
 515 {
 516     wxCHECK_MSG( m_open, false, wxT("clipboard not open") );
 517
 518     /* get formats from wxDataObjects */
 519     wxDataFormat *array = new wxDataFormat[ data.GetFormatCount() ];
 520     data.GetAllFormats( array );
 521
 522     for (size_t i = 0; i < data.GetFormatCount(); i++)
 523     {
 524         wxDataFormat format( array[i] );
 525
 526         wxLogTrace( TRACE_CLIPBOARD,
 527                     wxT("wxClipboard::GetData: requested format: %s"),
 528                     format.GetId().c_str() );
 529
 530         /* is data supported by clipboard ? */
 531
 532         /* store requested format to be asked for by callbacks */
 533         m_targetRequested = format;
 534
 535         wxCHECK_MSG( m_targetRequested, false, wxT("invalid clipboard format") );
 536
 537         m_formatSupported = false;
 538
 539        /* perform query. this will set m_formatSupported to
 540           true if m_targetRequested is supported.
 541           also, we have to wait for the "answer" from the
 542           clipboard owner which is an asynchronous process.
 543           therefore we set m_waiting = true here and wait
 544           until the callback "targets_selection_received"
 545           sets it to false */
 546
 547         m_waiting = true;
 548
 549 #if 0
 550         gtk_selection_convert( m_targetsWidget,
 551                            m_usePrimary ? (GdkAtom)GDK_SELECTION_PRIMARY
 552                                         : g_clipboardAtom,
 553                            g_targetsAtom,
 554                            (guint32) GDK_CURRENT_TIME );
 555
 556         while (m_waiting) gtk_main_iteration();
 557 #endif
 558
 559         if (!m_formatSupported) continue;
 560
 561         /* store pointer to data object to be filled up by callbacks */
 562         m_receivedData = &data;
 563
 564         /* store requested format to be asked for by callbacks */
 565         m_targetRequested = format;
 566
 567         wxCHECK_MSG( m_targetRequested, false, wxT("invalid clipboard format") );
 568
 569         /* start query */
 570         m_formatSupported = false;
 571
 572         /* ask for clipboard contents.  this will set
 573            m_formatSupported to true if m_targetRequested
 574            is supported.
 575            also, we have to wait for the "answer" from the
 576            clipboard owner which is an asynchronous process.
 577            therefore we set m_waiting = true here and wait
 578            until the callback "targets_selection_received"
 579            sets it to false */
 580
 581         m_waiting = true;
 582
 583         wxLogTrace( TRACE_CLIPBOARD,
 584                     wxT("wxClipboard::GetData: format found, start convert") );
 585
 586 #if 0
 587         gtk_selection_convert( m_clipboardWidget,
 588                                m_usePrimary ? (GdkAtom)GDK_SELECTION_PRIMARY
 589                                             : g_clipboardAtom,
 590                                m_targetRequested,
 591                                (guint32) GDK_CURRENT_TIME );
 592
 593         while (m_waiting) gtk_main_iteration();
 594 #endif
 595
 596         /* this is a true error as we checked for the presence of such data before */
 597         wxCHECK_MSG( m_formatSupported, false, wxT("error retrieving data from clipboard") );
 598
 599         /* return success */
 600         delete[] array;
 601         return true;
 602     }
 603
 604     wxLogTrace( TRACE_CLIPBOARD,
 605                 wxT("wxClipboard::GetData: format not found") );
 606
 607     /* return failure */
 608     delete[] array;
 609     return false;
 610 }
 611
 612 #endif
 613   // wxUSE_CLIPBOARD