src/gtk1/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 "wx/dataobj.h"
  19 #include "wx/utils.h"
  20 #include "wx/log.h"
  21
  22 #include "glib.h"
  23 #include "gdk/gdk.h"
  24 #include "gtk/gtk.h"
  25
  26 //-----------------------------------------------------------------------------
  27 // thread system
  28 //-----------------------------------------------------------------------------
  29
  30 #if wxUSE_THREADS
  31 extern void wxapp_install_thread_wakeup();
  32 extern void wxapp_uninstall_thread_wakeup();
  33 #endif
  34
  35 //-----------------------------------------------------------------------------
  36 // data
  37 //-----------------------------------------------------------------------------
  38
  39 wxClipboard *wxTheClipboard = (wxClipboard*) NULL;
  40
  41 GdkAtom  g_clipboardAtom   = 0;
  42 GdkAtom  g_targetsAtom     = 0;
  43
  44 //-----------------------------------------------------------------------------
  45 // reminder
  46 //-----------------------------------------------------------------------------
  47
  48 /* The contents of a selection are returned in a GtkSelectionData
  49    structure. selection/target identify the request.
  50    type specifies the type of the return; if length < 0, and
  51    the data should be ignored. This structure has object semantics -
  52    no fields should be modified directly, they should not be created
  53    directly, and pointers to them should not be stored beyond the duration of
  54    a callback. (If the last is changed, we'll need to add reference
  55    counting)
  56
  57 struct _GtkSelectionData
  58 {
  59   GdkAtom selection;
  60   GdkAtom target;
  61   GdkAtom type;
  62   gint    format;
  63   guchar *data;
  64   gint    length;
  65 };
  66
  67 */
  68
  69 //-----------------------------------------------------------------------------
  70 // "selection_received" for targets
  71 //-----------------------------------------------------------------------------
  72
  73 static void
  74 targets_selection_received( GtkWidget *WXUNUSED(widget),
  75                             GtkSelectionData *selection_data,
  76 #if (GTK_MINOR_VERSION > 0)
  77                             guint32 WXUNUSED(time),
  78 #endif
  79                             wxClipboard *clipboard )
  80 {
  81     if (!wxTheClipboard)
  82     {
  83         clipboard->m_waiting = FALSE;
  84         return;
  85     }
  86
  87     if (selection_data->length <= 0)
  88     {
  89         clipboard->m_waiting = FALSE;
  90         return;
  91     }
  92
  93     /* make sure we got the data in the correct form */
  94     if (selection_data->type != GDK_SELECTION_TYPE_ATOM)
  95     {
  96         clipboard->m_waiting = FALSE;
  97         return;
  98     }
  99
 100     // the atoms we received, holding a list of targets (= formats)
 101     GdkAtom *atoms = (GdkAtom *)selection_data->data;
 102
 103     for (unsigned int i=0; i<selection_data->length/sizeof(GdkAtom); i++)
 104     {
 105 /*
 106         char *name = gdk_atom_name (atoms[i]);
 107         if (name) printf( "Format available: %s.\n", name ); */
 108
 109         if (atoms[i] == clipboard->m_targetRequested)
 110         {
 111             clipboard->m_waiting = FALSE;
 112             clipboard->m_formatSupported = TRUE;
 113             return;
 114         }
 115     }
 116
 117     clipboard->m_waiting = FALSE;
 118     return;
 119 }
 120
 121 //-----------------------------------------------------------------------------
 122 // "selection_received" for the actual data
 123 //-----------------------------------------------------------------------------
 124
 125 static void
 126 selection_received( GtkWidget *WXUNUSED(widget),
 127                     GtkSelectionData *selection_data,
 128 #if (GTK_MINOR_VERSION > 0)
 129                     guint32 WXUNUSED(time),
 130 #endif
 131                     wxClipboard *clipboard )
 132 {
 133     if (!wxTheClipboard)
 134     {
 135         clipboard->m_waiting = FALSE;
 136         return;
 137     }
 138
 139     wxDataObject *data_object = clipboard->m_receivedData;
 140
 141     if (!data_object)
 142     {
 143         clipboard->m_waiting = FALSE;
 144         return;
 145     }
 146
 147     if (selection_data->length <= 0)
 148     {
 149         clipboard->m_waiting = FALSE;
 150         return;
 151     }
 152
 153     wxDataFormat format( selection_data->target );
 154
 155     /* make sure we got the data in the correct format */
 156     if (!data_object->IsSupportedFormat( format ) )
 157     {
 158         clipboard->m_waiting = FALSE;
 159         return;
 160     }
 161
 162     /* make sure we got the data in the correct form (selection type).
 163        if so, copy data to target object */
 164
 165     switch (format.GetType())
 166     {
 167         case wxDF_TEXT:
 168         {
 169             if (selection_data->type != GDK_SELECTION_TYPE_STRING)
 170             {
 171                 clipboard->m_waiting = FALSE;
 172                 return;
 173             }
 174
 175             wxTextDataObject *text_object = (wxTextDataObject *) data_object;
 176
 177             wxString text = (const char*) selection_data->data;
 178
 179             text_object->SetText( text );
 180
 181             break;
 182         }
 183
 184         case wxDF_BITMAP:
 185         {
 186             if (selection_data->type != GDK_SELECTION_TYPE_STRING)
 187             {
 188                 clipboard->m_waiting = FALSE;
 189                 return;
 190             }
 191
 192             wxBitmapDataObject *bitmap_object = (wxBitmapDataObject *) data_object;
 193
 194             bitmap_object->SetData( (size_t) selection_data->length, (const void*) selection_data->data );
 195
 196             break;
 197         }
 198
 199         case wxDF_PRIVATE:
 200         {
 201             if (selection_data->type != GDK_SELECTION_TYPE_STRING)
 202             {
 203                 clipboard->m_waiting = FALSE;
 204                 return;
 205             }
 206
 207             data_object->SetData( format, (size_t) selection_data->length, (const char*) selection_data->data );
 208
 209             break;
 210         }
 211
 212         default:
 213         {
 214             clipboard->m_waiting = FALSE;
 215             return;
 216         }
 217     }
 218
 219     wxTheClipboard->m_formatSupported = TRUE;
 220     clipboard->m_waiting = FALSE;
 221 }
 222
 223 //-----------------------------------------------------------------------------
 224 // "selection_clear"
 225 //-----------------------------------------------------------------------------
 226
 227 static gint
 228 selection_clear_clip( GtkWidget *WXUNUSED(widget), GdkEventSelection *event )
 229 {
 230     if (!wxTheClipboard) return TRUE;
 231
 232     if (event->selection == GDK_SELECTION_PRIMARY)
 233     {
 234         wxTheClipboard->m_ownsPrimarySelection = FALSE;
 235     }
 236     else
 237     if (event->selection == g_clipboardAtom)
 238     {
 239         wxTheClipboard->m_ownsClipboard = FALSE;
 240     }
 241     else
 242     {
 243         wxTheClipboard->m_waiting = FALSE;
 244         return FALSE;
 245     }
 246
 247     if ((!wxTheClipboard->m_ownsPrimarySelection) &&
 248         (!wxTheClipboard->m_ownsClipboard))
 249     {
 250         /* the clipboard is no longer in our hands. we can the delete clipboard data. */
 251         if (wxTheClipboard->m_data)
 252         {
 253             delete wxTheClipboard->m_data;
 254             wxTheClipboard->m_data = (wxDataObject*) NULL;
 255         }
 256     }
 257
 258     wxTheClipboard->m_waiting = FALSE;
 259     return TRUE;
 260 }
 261
 262 //-----------------------------------------------------------------------------
 263 // selection handler for supplying data
 264 //-----------------------------------------------------------------------------
 265
 266 static void
 267 selection_handler( GtkWidget *WXUNUSED(widget), GtkSelectionData *selection_data, gpointer WXUNUSED(data) )
 268 {
 269     if (!wxTheClipboard) return;
 270
 271     if (!wxTheClipboard->m_data) return;
 272
 273     wxDataObject *data = wxTheClipboard->m_data;
 274
 275     wxDataFormat format( selection_data->target );
 276
 277     if (!data->IsSupportedFormat( format )) return;
 278
 279     if (format.GetType() == wxDF_TEXT)
 280     {
 281         wxTextDataObject *text_object = (wxTextDataObject*) data;
 282         wxString text( text_object->GetText() );
 283
 284 #if wxUSE_UNICODE
 285         const wxWX2MBbuf s = text.mbc_str();
 286         int len = strlen(s);
 287 #else // more efficient in non-Unicode
 288         const char *s = text.c_str();
 289         int len = (int) text.Length();
 290 #endif
 291         gtk_selection_data_set(
 292             selection_data,
 293             GDK_SELECTION_TYPE_STRING,
 294             8*sizeof(gchar),
 295             (unsigned char*) (const char*) s,
 296             len );
 297
 298         return;
 299     }
 300
 301     if (format.GetType() == wxDF_BITMAP)
 302     {
 303         wxBitmapDataObject *bitmap_object = (wxBitmapDataObject*) data;
 304
 305         if (bitmap_object->GetDataSize() == 0) return;
 306
 307         gtk_selection_data_set(
 308             selection_data,
 309             GDK_SELECTION_TYPE_STRING,
 310             8*sizeof(gchar),
 311             (unsigned char*) bitmap_object->GetPngData(),
 312             (int) bitmap_object->GetDataSize() );
 313
 314         return;
 315     }
 316
 317     int size = data->GetDataSize( format );
 318
 319     if (size == 0) return;
 320
 321     char *d = new char[size];
 322
 323     data->GetDataHere( selection_data->target, (void*) d );
 324
 325     gtk_selection_data_set(
 326         selection_data,
 327         GDK_SELECTION_TYPE_STRING,
 328         8*sizeof(gchar),
 329         (unsigned char*) d,
 330         size );
 331 }
 332
 333 //-----------------------------------------------------------------------------
 334 // wxClipboard
 335 //-----------------------------------------------------------------------------
 336
 337 IMPLEMENT_DYNAMIC_CLASS(wxClipboard,wxObject)
 338
 339 wxClipboard::wxClipboard()
 340 {
 341     m_open = FALSE;
 342
 343     m_ownsClipboard = FALSE;
 344     m_ownsPrimarySelection = FALSE;
 345
 346     m_data = (wxDataObject*) NULL;
 347     m_receivedData = (wxDataObject*) NULL;
 348
 349     /* we use m_targetsWidget to query what formats are available */
 350
 351     m_targetsWidget = gtk_window_new( GTK_WINDOW_POPUP );
 352     gtk_widget_realize( m_targetsWidget );
 353
 354     gtk_signal_connect( GTK_OBJECT(m_targetsWidget),
 355                         "selection_received",
 356                         GTK_SIGNAL_FUNC( targets_selection_received ),
 357                         (gpointer) this );
 358
 359     /* we use m_clipboardWidget to get and to offer data */
 360
 361     m_clipboardWidget = gtk_window_new( GTK_WINDOW_POPUP );
 362     gtk_widget_realize( m_clipboardWidget );
 363
 364     gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
 365                         "selection_received",
 366                         GTK_SIGNAL_FUNC( selection_received ),
 367                         (gpointer) this );
 368
 369     gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
 370                         "selection_clear_event",
 371                         GTK_SIGNAL_FUNC( selection_clear_clip ),
 372                         (gpointer) NULL );
 373
 374     if (!g_clipboardAtom) g_clipboardAtom = gdk_atom_intern( "CLIPBOARD", FALSE );
 375     if (!g_targetsAtom) g_targetsAtom = gdk_atom_intern ("TARGETS", FALSE);
 376
 377     m_formatSupported = FALSE;
 378     m_targetRequested = 0;
 379
 380     m_usePrimary = FALSE;
 381 }
 382
 383 wxClipboard::~wxClipboard()
 384 {
 385     Clear();
 386
 387     if (m_clipboardWidget) gtk_widget_destroy( m_clipboardWidget );
 388     if (m_targetsWidget) gtk_widget_destroy( m_targetsWidget );
 389 }
 390
 391 void wxClipboard::Clear()
 392 {
 393     if (m_data)
 394     {
 395 #if wxUSE_THREADS
 396         /* disable GUI threads */
 397         wxapp_uninstall_thread_wakeup();
 398 #endif
 399
 400         /*  As we have data we also own the clipboard. Once we no longer own
 401             it, clear_selection is called which will set m_data to zero */
 402         if (gdk_selection_owner_get( g_clipboardAtom ) == m_clipboardWidget->window)
 403         {
 404             m_waiting = TRUE;
 405
 406             gtk_selection_owner_set( (GtkWidget*) NULL, g_clipboardAtom, GDK_CURRENT_TIME );
 407
 408             while (m_waiting) gtk_main_iteration();
 409         }
 410
 411         if (gdk_selection_owner_get( GDK_SELECTION_PRIMARY ) == m_clipboardWidget->window)
 412         {
 413             m_waiting = TRUE;
 414
 415             gtk_selection_owner_set( (GtkWidget*) NULL, GDK_SELECTION_PRIMARY, GDK_CURRENT_TIME );
 416
 417             while (m_waiting) gtk_main_iteration();
 418         }
 419
 420         if (m_data)
 421         {
 422             delete m_data;
 423             m_data = (wxDataObject*) NULL;
 424         }
 425
 426 #if wxUSE_THREADS
 427         /* re-enable GUI threads */
 428         wxapp_install_thread_wakeup();
 429 #endif
 430     }
 431
 432     m_targetRequested = 0;
 433     m_formatSupported = FALSE;
 434 }
 435
 436 bool wxClipboard::Open()
 437 {
 438     wxCHECK_MSG( !m_open, FALSE, wxT("clipboard already open") );
 439
 440     m_open = TRUE;
 441
 442     return TRUE;
 443 }
 444
 445 bool wxClipboard::SetData( wxDataObject *data )
 446 {
 447     wxCHECK_MSG( m_open, FALSE, wxT("clipboard not open") );
 448
 449     wxCHECK_MSG( data, FALSE, wxT("data is invalid") );
 450
 451     Clear();
 452
 453     return AddData( data );
 454 }
 455
 456 bool wxClipboard::AddData( wxDataObject *data )
 457 {
 458     wxCHECK_MSG( m_open, FALSE, wxT("clipboard not open") );
 459
 460     wxCHECK_MSG( data, FALSE, wxT("data is invalid") );
 461
 462     /* we can only store one wxDataObject */
 463     Clear();
 464
 465     m_data = data;
 466
 467     /* This should happen automatically, but to be on the safe side */
 468     m_ownsClipboard = FALSE;
 469     m_ownsPrimarySelection = FALSE;
 470
 471     /* get formats from wxDataObjects */
 472     wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
 473     m_data->GetAllFormats( array );
 474
 475     for (size_t i = 0; i < m_data->GetFormatCount(); i++)
 476     {
 477         GdkAtom atom = array[i];
 478         wxLogDebug( wxT("Clipboard Supported atom %s"), gdk_atom_name( atom ) );
 479
 480         /* Add handlers if someone requests data. We currently always
 481            offer data to the clipboard and the primary selection. Maybe
 482            we should make that depend on the usePrimary flag */
 483
 484         gtk_selection_add_target( GTK_WIDGET(m_clipboardWidget),
 485                               GDK_SELECTION_PRIMARY,
 486                               atom,
 487                               0 );  /* what is info ? */
 488
 489         gtk_selection_add_target( GTK_WIDGET(m_clipboardWidget),
 490                               g_clipboardAtom,
 491                               atom,
 492                               0 );  /* what is info ? */
 493     }
 494
 495     delete[] array;
 496
 497     gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
 498                         "selection_get",
 499                         GTK_SIGNAL_FUNC(selection_handler),
 500                         (gpointer) NULL );
 501
 502 #if wxUSE_THREADS
 503         /* disable GUI threads */
 504         wxapp_uninstall_thread_wakeup();
 505 #endif
 506
 507     /* Tell the world we offer clipboard data */
 508     if (!gtk_selection_owner_set( m_clipboardWidget,
 509                                   g_clipboardAtom,
 510                                   GDK_CURRENT_TIME ))
 511     {
 512 #if wxUSE_THREADS
 513         /* re-enable GUI threads */
 514         wxapp_install_thread_wakeup();
 515 #endif
 516         return FALSE;
 517     }
 518     m_ownsClipboard = TRUE;
 519
 520     if (!gtk_selection_owner_set( m_clipboardWidget,
 521                                   GDK_SELECTION_PRIMARY,
 522                                   GDK_CURRENT_TIME ))
 523     {
 524 #if wxUSE_THREADS
 525         /* re-enable GUI threads */
 526         wxapp_install_thread_wakeup();
 527 #endif
 528         return FALSE;
 529     }
 530     m_ownsPrimarySelection = TRUE;
 531
 532 #if wxUSE_THREADS
 533     /* re-enable GUI threads */
 534     wxapp_install_thread_wakeup();
 535 #endif
 536
 537     return TRUE;
 538 }
 539
 540 void wxClipboard::Close()
 541 {
 542     wxCHECK_RET( m_open, wxT("clipboard not open") );
 543
 544     m_open = FALSE;
 545 }
 546
 547 bool wxClipboard::IsSupported( const wxDataFormat& format )
 548 {
 549     /* store requested format to be asked for by callbacks */
 550
 551     m_targetRequested = format;
 552
 553     wxCHECK_MSG( m_targetRequested, FALSE, wxT("invalid clipboard format") );
 554
 555     m_formatSupported = FALSE;
 556
 557     /* perform query. this will set m_formatSupported to
 558        TRUE if m_targetRequested is supported.
 559        alsom we have to wait for the "answer" from the
 560        clipboard owner which is an asynchronous process.
 561        therefore we set m_waiting = TRUE here and wait
 562        until the callback "targets_selection_received"
 563        sets it to FALSE */
 564
 565     m_waiting = TRUE;
 566
 567     gtk_selection_convert( m_targetsWidget,
 568                            m_usePrimary ? GDK_SELECTION_PRIMARY : g_clipboardAtom,
 569                            g_targetsAtom,
 570                            GDK_CURRENT_TIME );
 571
 572     while (m_waiting) gtk_main_iteration();
 573
 574     if (!m_formatSupported) return FALSE;
 575
 576     return TRUE;
 577 }
 578
 579 bool wxClipboard::GetData( wxDataObject& data )
 580 {
 581     wxCHECK_MSG( m_open, FALSE, wxT("clipboard not open") );
 582
 583     /* get formats from wxDataObjects */
 584     wxDataFormat *array = new wxDataFormat[ data.GetFormatCount() ];
 585     data.GetAllFormats( array );
 586
 587     for (size_t i = 0; i < data.GetFormatCount(); i++)
 588     {
 589         /* is data supported by clipboard ? */
 590         if (!IsSupported( array[i] ))
 591            continue;
 592
 593         /* store pointer to data object to be filled up by callbacks */
 594         m_receivedData = &data;
 595
 596         /* store requested format to be asked for by callbacks */
 597         m_targetRequested = array[i];
 598
 599         wxCHECK_MSG( m_targetRequested, FALSE, wxT("invalid clipboard format") );
 600
 601         /* start query */
 602         m_formatSupported = FALSE;
 603
 604         /* ask for clipboard contents.  this will set
 605            m_formatSupported to TRUE if m_targetRequested
 606            is supported.
 607            also, we have to wait for the "answer" from the
 608            clipboard owner which is an asynchronous process.
 609            therefore we set m_waiting = TRUE here and wait
 610            until the callback "targets_selection_received"
 611            sets it to FALSE */
 612
 613         m_waiting = TRUE;
 614
 615         gtk_selection_convert( m_clipboardWidget,
 616                            m_usePrimary ? GDK_SELECTION_PRIMARY : g_clipboardAtom,
 617                            m_targetRequested,
 618                            GDK_CURRENT_TIME );
 619
 620         while (m_waiting) gtk_main_iteration();
 621
 622         /* this is a true error as we checked for the presence of such data before */
 623         wxCHECK_MSG( m_formatSupported, FALSE, wxT("error retrieving data from clipboard") );
 624
 625         /* return success */
 626         delete[] array;
 627         return TRUE;
 628     }
 629
 630     /* return failure */
 631     delete[] array;
 632     return FALSE;
 633 }
 634
 635 #endif
 636   // wxUSE_CLIPBOARD
 637