X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/99c67c777b7d7a6f0ea74823bff7b9c40379b5fa..8aaef28406647d6aa706c34f57dd151f00b18e5b:/src/gtk/clipbrd.cpp?ds=sidebyside

diff --git a/src/gtk/clipbrd.cpp b/src/gtk/clipbrd.cpp
index d7812a880f..1800ae2685 100644
--- a/src/gtk/clipbrd.cpp
+++ b/src/gtk/clipbrd.cpp
@@ -4,7 +4,7 @@
 // Author:      Robert Roebling
 // Id:          $Id$
 // Copyright:   (c) 1998 Robert Roebling
-// Licence:   	wxWindows licence
+// Licence:           wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
 #ifdef __GNUG__
@@ -13,13 +13,29 @@
 
 #include "wx/clipbrd.h"
 
+#if wxUSE_CLIPBOARD
+
+#include "wx/dataobj.h"
+#include "wx/utils.h"
+#include "wx/log.h"
+
+#include "glib.h"
+#include "gdk/gdk.h"
+#include "gtk/gtk.h"
+
 //-----------------------------------------------------------------------------
-// data
+// thread system
 //-----------------------------------------------------------------------------
 
-wxClipboard *wxTheClipboard = (wxClipboard*) NULL;
+#if wxUSE_THREADS
+extern void wxapp_install_thread_wakeup();
+extern void wxapp_uninstall_thread_wakeup();
+#endif
+
+//-----------------------------------------------------------------------------
+// data
+//-----------------------------------------------------------------------------
 
-GdkAtom  g_textAtom        = 0;
 GdkAtom  g_clipboardAtom   = 0;
 GdkAtom  g_targetsAtom     = 0;
 
@@ -41,9 +57,9 @@ struct _GtkSelectionData
   GdkAtom selection;
   GdkAtom target;
   GdkAtom type;
-  gint	  format;
+  gint          format;
   guchar *data;
-  gint	  length;
+  gint          length;
 };
 
 */
@@ -55,28 +71,56 @@ struct _GtkSelectionData
 static void
 targets_selection_received( GtkWidget *WXUNUSED(widget), 
                             GtkSelectionData *selection_data, 
-		            wxClipboard *clipboard )
+#if (GTK_MINOR_VERSION > 0)
+                            guint32 WXUNUSED(time),
+#endif
+                            wxClipboard *clipboard )
 {
-  if (!wxTheClipboard) return;
-  
-  if (selection_data->length <= 0) return;
+    if (!wxTheClipboard)
+    {
+        clipboard->m_waiting = FALSE;
+        return;
+    }
   
-  // make sure we got the data in the correct form 
-  if (selection_data->type != GDK_SELECTION_TYPE_ATOM) return;
+    if (selection_data->length <= 0)
+    {
+        clipboard->m_waiting = FALSE;
+        return;
+    }
+    
+    /* make sure we got the data in the correct form */
+    if (selection_data->type != GDK_SELECTION_TYPE_ATOM)
+    {
+        clipboard->m_waiting = FALSE;
+        return;
+    }
+    
+/*
+    wxDataFormat clip( selection_data->selection );
+    wxLogDebug( wxT("selection received for targets, clipboard %s"), clip.GetId().c_str() );
+*/
   
-  // the atoms we received, holding a list of targets (= formats) 
-  GdkAtom *atoms = (GdkAtom *)selection_data->data;
-
-  for (unsigned int i=0; i<selection_data->length/sizeof(GdkAtom); i++)
-  {
-     if (atoms[i] == clipboard->m_targetRequested)
-     {
-       clipboard->m_formatSupported = TRUE;
-       return;
-     }
-  }
-
-  return;
+    // the atoms we received, holding a list of targets (= formats) 
+    GdkAtom *atoms = (GdkAtom *)selection_data->data;
+
+    for (unsigned int i=0; i<selection_data->length/sizeof(GdkAtom); i++)
+    {
+        wxDataFormat format( atoms[i] );
+	
+/*
+	wxLogDebug( wxT("selection received for targets, format %s"), format.GetId().c_str() );
+*/
+
+        if (format == clipboard->m_targetRequested)
+        {
+            clipboard->m_waiting = FALSE;
+            clipboard->m_formatSupported = TRUE;
+            return;
+        }
+    }
+
+    clipboard->m_waiting = FALSE;
+    return;
 }
 
 //-----------------------------------------------------------------------------
@@ -86,22 +130,52 @@ targets_selection_received( GtkWidget *WXUNUSED(widget),
 static void 
 selection_received( GtkWidget *WXUNUSED(widget), 
                     GtkSelectionData *selection_data, 
-		    wxClipboard *clipboard )
+#if (GTK_MINOR_VERSION > 0)
+                    guint32 WXUNUSED(time),
+#endif
+                    wxClipboard *clipboard )
 {
-  if (!wxTheClipboard) return;
-  
-  if (selection_data->length <= 0) return;
-  
-  size_t size = (size_t) selection_data->length;
-  
-  // make sure we got the data in the correct form 
-  if (selection_data->type != GDK_SELECTION_TYPE_STRING) return;
-  
-  clipboard->m_receivedSize = size;
+    if (!wxTheClipboard)
+    {
+        clipboard->m_waiting = FALSE;
+        return;
+    }
   
-  clipboard->m_receivedData = new char[size+1];
+    wxDataObject *data_object = clipboard->m_receivedData;
+
+    if (!data_object)
+    {
+        clipboard->m_waiting = FALSE;
+        return;
+    }
+    
+    if (selection_data->length <= 0)
+    {
+        clipboard->m_waiting = FALSE;
+        return;
+    }
+    
+    wxDataFormat format( selection_data->target );
   
-  memcpy( clipboard->m_receivedData, selection_data->data, size);  
+    /* make sure we got the data in the correct format */
+    if (!data_object->IsSupportedFormat( format ) )
+    {
+        clipboard->m_waiting = FALSE;
+        return;
+    }
+
+    /* make sure we got the data in the correct form (selection type).
+       if so, copy data to target object */
+    if (selection_data->type != GDK_SELECTION_TYPE_STRING)
+    {
+        clipboard->m_waiting = FALSE;
+        return;
+    }
+            
+    data_object->SetData( format, (size_t) selection_data->length, (const char*) selection_data->data );
+    
+    wxTheClipboard->m_formatSupported = TRUE;
+    clipboard->m_waiting = FALSE;
 }
 
 //-----------------------------------------------------------------------------
@@ -109,16 +183,40 @@ selection_received( GtkWidget *WXUNUSED(widget),
 //-----------------------------------------------------------------------------
 
 static gint
-selection_clear( GtkWidget *WXUNUSED(widget), GdkEventSelection *WXUNUSED(event) )
+selection_clear_clip( GtkWidget *WXUNUSED(widget), GdkEventSelection *event )
 {
-  if (!wxTheClipboard) return TRUE;
-  
-  /* the clipboard is no longer in our hands. we can delete the
-   * clipboard data. I hope I got that one right... */
+    if (!wxTheClipboard) return TRUE;
     
-  wxTheClipboard->SetData( (wxDataObject*) NULL );
+    if (event->selection == GDK_SELECTION_PRIMARY)
+    {
+        wxTheClipboard->m_ownsPrimarySelection = FALSE;
+    }
+    else
+    if (event->selection == g_clipboardAtom)
+    {
+        wxTheClipboard->m_ownsClipboard = FALSE;
+    }
+    else
+    {
+        wxTheClipboard->m_waiting = FALSE;
+        return FALSE;
+    }
+    
+    if ((!wxTheClipboard->m_ownsPrimarySelection) &&
+        (!wxTheClipboard->m_ownsClipboard))
+    {
+        /* the clipboard is no longer in our hands. we can the delete clipboard data. */
+        if (wxTheClipboard->m_data)
+        {
+	    wxLogDebug( wxT("wxClipboard will get cleared" ) );
+	    
+            delete wxTheClipboard->m_data;
+            wxTheClipboard->m_data = (wxDataObject*) NULL;
+        }
+    }
   
-  return TRUE;
+    wxTheClipboard->m_waiting = FALSE;
+    return TRUE;
 }
 
 //-----------------------------------------------------------------------------
@@ -128,33 +226,53 @@ selection_clear( GtkWidget *WXUNUSED(widget), GdkEventSelection *WXUNUSED(event)
 static void
 selection_handler( GtkWidget *WXUNUSED(widget), GtkSelectionData *selection_data, gpointer WXUNUSED(data) )
 {
-  if (!wxTheClipboard) return;
-  
-  wxDataObject *data_object = wxTheClipboard->m_data;
+    if (!wxTheClipboard) return;
   
-  if (!data_object) return;
+    if (!wxTheClipboard->m_data) return;
   
-  if (data_object->GetDataSize() == 0) return;
+    wxDataObject *data = wxTheClipboard->m_data;
+    
+    wxDataFormat format( selection_data->target );
 
+    if (!data->IsSupportedFormat( format )) return;
   
-  
-  gint len = data_object->GetDataSize();
-  guchar *bin_data = (guchar*) malloc( len );
-  data_object->GetDataHere( (void*)bin_data );
-  
-  if (selection_data->target == GDK_TARGET_STRING)
-  {
-    gtk_selection_data_set( 
-      selection_data, GDK_SELECTION_TYPE_STRING, 8*sizeof(gchar), bin_data, len );
-  }
-/*
-  else if (selection_data->target == g_textAtom)
-  {
+    /* this will fail for composite formats */
+    if (format.GetType() == wxDF_TEXT)
+    {
+        wxTextDataObject *text_object = (wxTextDataObject*) data;
+        wxString text( text_object->GetText() );
+
+#if wxUSE_UNICODE
+        const wxWX2MBbuf s = text.mbc_str();
+        int len = strlen(s);
+#else // more efficient in non-Unicode
+        const char *s = text.c_str();
+        int len = (int) text.Length();
+#endif
+        gtk_selection_data_set( 
+            selection_data, 
+            GDK_SELECTION_TYPE_STRING, 
+            8*sizeof(gchar),
+            (unsigned char*) (const char*) s,
+            len ); 
+                    
+        return;
+    }
+
+    int size = data->GetDataSize( format );
+    
+    if (size == 0) return;
+    
+    char *d = new char[size];
+    
+    data->GetDataHere( selection_data->target, (void*) d );
+
     gtk_selection_data_set( 
-      selection_data, g_textAtom, 8*sizeof(gchar), bin_data, len );
-  }
-*/
-  free( bin_data );
+        selection_data, 
+        GDK_SELECTION_TYPE_STRING, 
+        8*sizeof(gchar), 
+        (unsigned char*) d,
+        size ); 
 }
 
 //-----------------------------------------------------------------------------
@@ -165,202 +283,318 @@ IMPLEMENT_DYNAMIC_CLASS(wxClipboard,wxObject)
 
 wxClipboard::wxClipboard()
 {
-  m_data = (wxDataObject*) NULL;
-  
-  m_clipboardWidget = gtk_window_new( GTK_WINDOW_POPUP );
-  gtk_widget_realize( m_clipboardWidget );
-
-  gtk_signal_connect( GTK_OBJECT(m_clipboardWidget), 
-                      "selection_clear_event",
-		      GTK_SIGNAL_FUNC( selection_clear ), 
-		      (gpointer) NULL );
-		      
-  if (!g_clipboardAtom) g_clipboardAtom = gdk_atom_intern( "CLIPBOARD", FALSE );
-  if (!g_textAtom) g_textAtom = gdk_atom_intern( "TEXT", FALSE );
-  if (!g_targetsAtom) g_targetsAtom = gdk_atom_intern ("TARGETS", FALSE);
-  
-  m_receivedData = (char*)NULL;
-  m_receivedSize = 0;
-  m_formatSupported = FALSE;
-  m_targetRequested = 0;
+    m_open = FALSE;
+
+    m_ownsClipboard = FALSE;
+    m_ownsPrimarySelection = FALSE;
+
+    m_data = (wxDataObject*) NULL;
+    m_receivedData = (wxDataObject*) NULL;
+
+    /* we use m_targetsWidget to query what formats are available */
+    
+    m_targetsWidget = gtk_window_new( GTK_WINDOW_POPUP );
+    gtk_widget_realize( m_targetsWidget );
+
+    gtk_signal_connect( GTK_OBJECT(m_targetsWidget), 
+                        "selection_received",
+                        GTK_SIGNAL_FUNC( targets_selection_received ), 
+                        (gpointer) this );
+                        
+    /* we use m_clipboardWidget to get and to offer data */
+    
+    m_clipboardWidget = gtk_window_new( GTK_WINDOW_POPUP );
+    gtk_widget_realize( m_clipboardWidget );
+
+    gtk_signal_connect( GTK_OBJECT(m_clipboardWidget), 
+                        "selection_received",
+                        GTK_SIGNAL_FUNC( selection_received ), 
+                        (gpointer) this );
+
+    gtk_signal_connect( GTK_OBJECT(m_clipboardWidget), 
+                        "selection_clear_event",
+                        GTK_SIGNAL_FUNC( selection_clear_clip ), 
+                        (gpointer) NULL );
+                      
+    if (!g_clipboardAtom) g_clipboardAtom = gdk_atom_intern( "CLIPBOARD", FALSE );
+    if (!g_targetsAtom) g_targetsAtom = gdk_atom_intern ("TARGETS", FALSE);
+  
+    m_formatSupported = FALSE;
+    m_targetRequested = 0;
+    
+    m_usePrimary = FALSE;
 }
 
 wxClipboard::~wxClipboard()
 {
-  Clear();  
+    Clear();  
   
-  if (m_clipboardWidget) gtk_widget_destroy( m_clipboardWidget );
+    if (m_clipboardWidget) gtk_widget_destroy( m_clipboardWidget );
+    if (m_targetsWidget) gtk_widget_destroy( m_targetsWidget );
 }
 
 void wxClipboard::Clear()
 {
-  /* As we have data we also own the clipboard. Once we no longer own
-     it, clear_selection is called which will set m_data to zero */
-     
-  if (m_data)
-  { 
-    if (gdk_selection_owner_get( g_clipboardAtom) == m_clipboardWidget->window)
+    if (m_data)
     {
-        gtk_selection_owner_set( (GtkWidget*) NULL, g_clipboardAtom, GDK_CURRENT_TIME );
-    }
+#if wxUSE_THREADS
+        /* disable GUI threads */
+        wxapp_uninstall_thread_wakeup();
+#endif
     
-    delete m_data;
-    m_data = (wxDataObject*) NULL;
-  }
-  
-  m_receivedSize = 0;
-  
-  if (m_receivedData)
-  {
-    delete[] m_receivedData;
-    m_receivedData = (char*) NULL;
-  }
-  
-  m_targetRequested = 0;
+        /*  As we have data we also own the clipboard. Once we no longer own
+            it, clear_selection is called which will set m_data to zero */
+        if (gdk_selection_owner_get( g_clipboardAtom ) == m_clipboardWidget->window)
+        {
+            m_waiting = TRUE;
+            
+            gtk_selection_owner_set( (GtkWidget*) NULL, g_clipboardAtom, GDK_CURRENT_TIME );
+            
+            while (m_waiting) gtk_main_iteration();
+        }
+    
+        if (gdk_selection_owner_get( GDK_SELECTION_PRIMARY ) == m_clipboardWidget->window)
+        {
+            m_waiting = TRUE;
+            
+            gtk_selection_owner_set( (GtkWidget*) NULL, GDK_SELECTION_PRIMARY, GDK_CURRENT_TIME );
+            
+            while (m_waiting) gtk_main_iteration();
+        }
+    
+        if (m_data)
+        { 
+            delete m_data;
+            m_data = (wxDataObject*) NULL;
+        }
+        
+#if wxUSE_THREADS
+        /* re-enable GUI threads */
+        wxapp_install_thread_wakeup();
+#endif
+    }
   
-  m_formatSupported = FALSE;
+    m_targetRequested = 0;
+    m_formatSupported = FALSE;
 }
 
-void wxClipboard::SetData( wxDataObject *data )
+bool wxClipboard::Open()
 {
-  Clear();
-  
-/*
-   GTK 1.0.X cannot remove a target from a widget so if a widget
-   at first offers text and then a bitmap (and no longer text) to 
-   the clipboard, we seem too have to delete it.
-*/
-
-  if (m_clipboardWidget) gtk_widget_destroy( m_clipboardWidget );
-  
-  m_clipboardWidget = gtk_window_new( GTK_WINDOW_POPUP );
-  gtk_widget_realize( m_clipboardWidget );
-
-  if (m_data) delete m_data;
-  m_data = data;
-  if (!m_data) return;
- 
-  if (!gtk_selection_owner_set( m_clipboardWidget, 
-                                g_clipboardAtom,
-				GDK_CURRENT_TIME))
-  {
-    delete m_data;
-    m_data = (wxDataObject*) NULL;
-    return;
-  }
+    wxCHECK_MSG( !m_open, FALSE, wxT("clipboard already open") );
   
-  switch (m_data->GetPreferredFormat())
-  {
-    case wxDF_TEXT:
-      gtk_selection_add_handler( m_clipboardWidget, 
-                                 g_clipboardAtom, 
-				// g_textAtom,
-				 GDK_TARGET_STRING,
-				 selection_handler,
-				 NULL );
-      break;
-    default:
-      break;
-  }
+    m_open = TRUE;
+    
+    return TRUE;
 }
 
-bool wxClipboard::IsSupportedFormat( wxDataFormat format )
+bool wxClipboard::SetData( wxDataObject *data )
 {
-  m_targetRequested = 0;
+    wxCHECK_MSG( m_open, FALSE, wxT("clipboard not open") );
   
-  if (format == wxDF_TEXT)
-  {
-//     m_targetRequested = g_textAtom;
-     m_targetRequested = GDK_TARGET_STRING;
-  }
+    wxCHECK_MSG( data, FALSE, wxT("data is invalid") );
   
-  if (m_targetRequested == 0) return FALSE;
+    Clear();
 
-  gtk_signal_connect( GTK_OBJECT(m_clipboardWidget), 
-                      "selection_received",
-		      GTK_SIGNAL_FUNC( targets_selection_received ), 
-		      (gpointer) this );
-  
-  m_formatSupported = FALSE;
-  
-  gtk_selection_convert( m_clipboardWidget,
-			 g_clipboardAtom, 
-			 g_targetsAtom,
-			 GDK_CURRENT_TIME );
-
-  gtk_signal_disconnect_by_func( GTK_OBJECT(m_clipboardWidget), 
-		                 GTK_SIGNAL_FUNC( targets_selection_received ),
-		                 (gpointer) this );
-  
-  if (!m_formatSupported) return FALSE;
-  
-  return TRUE;
+    return AddData( data );
 }
 
-bool wxClipboard::ObtainData( wxDataFormat format )
+bool wxClipboard::AddData( wxDataObject *data )
 {
-  m_receivedSize = 0;
+    wxCHECK_MSG( m_open, FALSE, wxT("clipboard not open") );
   
-  if (m_receivedData)
-  {
-    delete[] m_receivedData;
-    m_receivedData = (char*) NULL;
-  }
-  
-  m_targetRequested = 0;
-  
-  if (format == wxDF_TEXT)
-  {
-//     m_targetRequested = g_textAtom;
-     m_targetRequested = GDK_TARGET_STRING;
-  }
+    wxCHECK_MSG( data, FALSE, wxT("data is invalid") );
+    
+    /* we can only store one wxDataObject */
+    Clear();
   
-  if (m_targetRequested == 0) return FALSE;
+    m_data = data;
 
-  gtk_signal_connect( GTK_OBJECT(m_clipboardWidget), 
-                      "selection_received",
-		      GTK_SIGNAL_FUNC( selection_received ), 
-		      (gpointer) this );
+    /* get formats from wxDataObjects */
+    wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
+    m_data->GetAllFormats( array );
+
+    /* primary selection or clipboard */
+    GdkAtom clipboard = m_usePrimary ? (GdkAtom)GDK_SELECTION_PRIMARY
+                                     : g_clipboardAtom;
 
-  gtk_selection_convert( m_clipboardWidget,
-			 g_clipboardAtom, 
-			 m_targetRequested,
-			 GDK_CURRENT_TIME );
-  
-  gtk_signal_disconnect_by_func( GTK_OBJECT(m_clipboardWidget), 
-		                 GTK_SIGNAL_FUNC( selection_received ),
-		                 (gpointer) this );
     
-  if (m_receivedSize == 0) return FALSE;
-  
-  return TRUE;
+    for (size_t i = 0; i < m_data->GetFormatCount(); i++)
+    {
+        wxLogDebug( wxT("wxClipboard now supports atom %s"), array[i].GetId().c_str() );
+
+        gtk_selection_add_target( GTK_WIDGET(m_clipboardWidget),
+	                          clipboard,
+                                  array[i], 
+                                  0 );  /* what is info ? */
+    }
+
+    delete[] array;
+                             
+    gtk_signal_connect( GTK_OBJECT(m_clipboardWidget), 
+                        "selection_get",
+                        GTK_SIGNAL_FUNC(selection_handler), 
+                        (gpointer) NULL );
+
+#if wxUSE_THREADS
+    /* disable GUI threads */
+    wxapp_uninstall_thread_wakeup();
+#endif
+    
+    /* Tell the world we offer clipboard data */
+    bool res = (gtk_selection_owner_set( m_clipboardWidget,
+                                         clipboard,
+                                         GDK_CURRENT_TIME ));
+    
+    if (m_usePrimary)
+        m_ownsPrimarySelection = res;
+    else
+        m_ownsClipboard = res;
+    
+#if wxUSE_THREADS
+    /* re-enable GUI threads */
+    wxapp_install_thread_wakeup();
+#endif
+        
+    return res;
 }
 
-size_t wxClipboard::GetDataSize() const
+void wxClipboard::Close()
 {
-  return m_receivedSize;
+    wxCHECK_RET( m_open, wxT("clipboard not open") );
+    
+    m_open = FALSE;
 }
 
-void wxClipboard::GetDataHere( void *data ) const
+bool wxClipboard::IsOpened() const
 {
-  memcpy(data, m_receivedData, m_receivedSize );
+    return m_open;
 }
 
-//-----------------------------------------------------------------------------
-// wxClipboardModule
-//-----------------------------------------------------------------------------
+bool wxClipboard::IsSupported( const wxDataFormat& format )
+{
+    /* reentrance problems */
+    if (m_open) return TRUE;
+    
+    /* store requested format to be asked for by callbacks */
+    m_targetRequested = format;
+  
+    wxCHECK_MSG( m_targetRequested, FALSE, wxT("invalid clipboard format") );
+    
+    m_formatSupported = FALSE;
+  
+    /* perform query. this will set m_formatSupported to 
+       TRUE if m_targetRequested is supported.
+       alsom we have to wait for the "answer" from the 
+       clipboard owner which is an asynchronous process.
+       therefore we set m_waiting = TRUE here and wait
+       until the callback "targets_selection_received" 
+       sets it to FALSE */
+
+    m_waiting = TRUE;
 
-IMPLEMENT_DYNAMIC_CLASS(wxClipboardModule,wxModule)
+    gtk_selection_convert( m_targetsWidget,
+                           m_usePrimary ? (GdkAtom)GDK_SELECTION_PRIMARY
+                                        : g_clipboardAtom, 
+                           g_targetsAtom,
+                           GDK_CURRENT_TIME );
 
-bool wxClipboardModule::OnInit()
+    while (m_waiting) gtk_main_iteration();
+    
+    if (!m_formatSupported) return FALSE;
+    
+    return TRUE;
+}    
+    
+bool wxClipboard::GetData( wxDataObject& data )
 {
-  wxTheClipboard = new wxClipboard();
+    wxCHECK_MSG( m_open, FALSE, wxT("clipboard not open") );
+    
+    /* get formats from wxDataObjects */
+    wxDataFormat *array = new wxDataFormat[ data.GetFormatCount() ];
+    data.GetAllFormats( array );
+    
+    for (size_t i = 0; i < data.GetFormatCount(); i++)
+    {
+        wxDataFormat format( array[i] );
+    
+        wxLogDebug( wxT("wxClipboard::GetData: requested format: %s"), format.GetId().c_str() );
+    
+        /* is data supported by clipboard ? */
+	
+        /* store requested format to be asked for by callbacks */
+        m_targetRequested = format;
   
-  return TRUE;
-}
+        wxCHECK_MSG( m_targetRequested, FALSE, wxT("invalid clipboard format") );
+    
+        m_formatSupported = FALSE;
+  
+       /* perform query. this will set m_formatSupported to 
+          TRUE if m_targetRequested is supported.
+          also, we have to wait for the "answer" from the 
+          clipboard owner which is an asynchronous process.
+          therefore we set m_waiting = TRUE here and wait
+          until the callback "targets_selection_received" 
+          sets it to FALSE */
 
-void wxClipboardModule::OnExit()
-{
-  if (wxTheClipboard) delete wxTheClipboard;
-  wxTheClipboard = (wxClipboard*) NULL;
+        m_waiting = TRUE;
+
+        gtk_selection_convert( m_targetsWidget,
+                           m_usePrimary ? (GdkAtom)GDK_SELECTION_PRIMARY
+                                        : g_clipboardAtom, 
+                           g_targetsAtom,
+                           GDK_CURRENT_TIME );
+
+        while (m_waiting) gtk_main_iteration();
+    
+        if (!m_formatSupported) continue;
+    
+        /* store pointer to data object to be filled up by callbacks */
+        m_receivedData = &data;
+    
+        /* store requested format to be asked for by callbacks */
+        m_targetRequested = format;
+  
+        wxCHECK_MSG( m_targetRequested, FALSE, wxT("invalid clipboard format") );
+    
+        /* start query */
+        m_formatSupported = FALSE;
+  
+        /* ask for clipboard contents.  this will set 
+           m_formatSupported to TRUE if m_targetRequested 
+           is supported.
+           also, we have to wait for the "answer" from the 
+           clipboard owner which is an asynchronous process.
+           therefore we set m_waiting = TRUE here and wait
+           until the callback "targets_selection_received" 
+           sets it to FALSE */
+
+        m_waiting = TRUE;
+
+        wxLogDebug( wxT("wxClipboard::GetData: format found, start convert") );
+    
+        gtk_selection_convert( m_clipboardWidget,
+                               m_usePrimary ? (GdkAtom)GDK_SELECTION_PRIMARY
+                                            : g_clipboardAtom, 
+                               m_targetRequested,
+                               GDK_CURRENT_TIME );
+  
+        while (m_waiting) gtk_main_iteration();
+
+        /* this is a true error as we checked for the presence of such data before */
+        wxCHECK_MSG( m_formatSupported, FALSE, wxT("error retrieving data from clipboard") );
+        
+        /* return success */
+        delete[] array;
+        return TRUE;
+    }
+  
+    wxLogDebug( wxT("wxClipboard::GetData: format not found") );
+    
+    /* return failure */
+    delete[] array;
+    return FALSE;
 }
+
+#endif
+  // wxUSE_CLIPBOARD
+