Made widgets sample take up less space

[wxWidgets.git] / src / gtk / clipbrd.cpp

diff --git a/src/gtk/clipbrd.cpp b/src/gtk/clipbrd.cpp
index 1ab6f2c545c4628422f54dc531bd10cda0be7435..c6edc527b1d980eff1b786ecec9ab9c15fb36e7a 100644 (file)
--- a/src/gtk/clipbrd.cpp
+++ b/src/gtk/clipbrd.cpp
@@ -1,10 +1,10 @@
 /////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////

-// Name:        clipbrd.cpp
+// Name:        gtk/clipbrd.cpp

 // Purpose:
 // Author:      Robert Roebling
 // Id:          $Id$
 // Copyright:   (c) 1998 Robert Roebling
 // Purpose:
 // Author:      Robert Roebling
 // Id:          $Id$
 // Copyright:   (c) 1998 Robert Roebling

-// Licence:    wxWindows licence
+// Licence:     wxWindows licence

 /////////////////////////////////////////////////////////////////////////////
 
 #ifdef __GNUG__
 /////////////////////////////////////////////////////////////////////////////
 
 #ifdef __GNUG__


@@ -13,22 +13,41 @@
 
 #include "wx/clipbrd.h"
 
 
 #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
+#endif
+
+//-----------------------------------------------------------------------------
+// data
+//-----------------------------------------------------------------------------

 
 

-GdkAtom  g_textAtom        = 0;

 GdkAtom  g_clipboardAtom   = 0;
 GdkAtom  g_targetsAtom     = 0;
 
 GdkAtom  g_clipboardAtom   = 0;
 GdkAtom  g_targetsAtom     = 0;
 

+// the trace mask we use with wxLogTrace() - call
+// wxLog::AddTraceMask(TRACE_CLIPBOARD) to enable the trace messages from here
+// (there will be a *lot* of them!)
+static const wxChar *TRACE_CLIPBOARD = _T("clipboard");
+

 //-----------------------------------------------------------------------------
 // reminder
 //-----------------------------------------------------------------------------
 
 /* The contents of a selection are returned in a GtkSelectionData
 //-----------------------------------------------------------------------------
 // reminder
 //-----------------------------------------------------------------------------
 
 /* The contents of a selection are returned in a GtkSelectionData

-   structure. selection/target identify the request. 
+   structure. selection/target identify the request.

    type specifies the type of the return; if length < 0, and
    the data should be ignored. This structure has object semantics -
    no fields should be modified directly, they should not be created
    type specifies the type of the return; if length < 0, and
    the data should be ignored. This structure has object semantics -
    no fields should be modified directly, they should not be created


@@ -41,9 +60,9 @@ struct _GtkSelectionData
   GdkAtom selection;
   GdkAtom target;
   GdkAtom type;
   GdkAtom selection;
   GdkAtom target;
   GdkAtom type;

-  gint   format;
+  gint    format;

   guchar *data;
   guchar *data;

-  gint   length;
+  gint    length;

 };
 
 */
 };
 
 */


@@ -53,55 +72,112 @@ struct _GtkSelectionData
 //-----------------------------------------------------------------------------
 
 static void
 //-----------------------------------------------------------------------------
 
 static void

-targets_selection_received( GtkWidget *WXUNUSED(widget), 
-                            GtkSelectionData *selection_data, 
-                           wxClipboard *clipboard )
+targets_selection_received( GtkWidget *WXUNUSED(widget),
+                            GtkSelectionData *selection_data,
+#if (GTK_MINOR_VERSION > 0)
+                            guint32 WXUNUSED(time),
+#endif
+                            wxClipboard *clipboard )

 {
 {

-  if (!wxTheClipboard) return;
-  
-  if (selection_data->length <= 0) return;
-  
-  // make sure we got the data in the correct form 
-  if (selection_data->type != GDK_SELECTION_TYPE_ATOM) 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++)
-  {
-     if (atoms[i] == clipboard->m_targetRequested)
-     {
-       clipboard->m_formatSupported = TRUE;
-       return;
-     }
-  }
-
-  return;
+    if ( wxTheClipboard && selection_data->length > 0 )
+    {
+        /* make sure we got the data in the correct form */
+        GdkAtom type = selection_data->type;
+        if ( type != GDK_SELECTION_TYPE_ATOM )
+        {
+            if ( strcmp(gdk_atom_name(type), "TARGETS") )
+            {
+                wxLogTrace( TRACE_CLIPBOARD,
+                            _T("got unsupported clipboard target") );
+
+                clipboard->m_waiting = FALSE;
+                return;
+            }
+        }
+
+#ifdef __WXDEBUG__
+        wxDataFormat clip( selection_data->selection );
+        wxLogTrace( TRACE_CLIPBOARD,
+                    wxT("selection received for targets, clipboard %s"),
+                    clip.GetId().c_str() );
+#endif // __WXDEBUG__
+
+        // 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] );
+
+            wxLogTrace( TRACE_CLIPBOARD,
+                        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;

 }
 
 //-----------------------------------------------------------------------------
 // "selection_received" for the actual data
 //-----------------------------------------------------------------------------
 
 }
 
 //-----------------------------------------------------------------------------
 // "selection_received" for the actual data
 //-----------------------------------------------------------------------------
 

-static void 
-selection_received( GtkWidget *WXUNUSED(widget), 
-                    GtkSelectionData *selection_data, 
-                   wxClipboard *clipboard )
+static void
+selection_received( GtkWidget *WXUNUSED(widget),
+                    GtkSelectionData *selection_data,
+#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;
-  
-  clipboard->m_receivedData = new char[size+1];
-  
-  memcpy( clipboard->m_receivedData, selection_data->data, size);  
+    if (!wxTheClipboard)
+    {
+        clipboard->m_waiting = FALSE;
+        return;
+    }
+
+    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 );
+
+    /* 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 +185,40 @@ selection_received( GtkWidget *WXUNUSED(widget),
 //-----------------------------------------------------------------------------
 
 static gint
 //-----------------------------------------------------------------------------
 
 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... */
-    
-  wxTheClipboard->SetData( (wxDataObject*) NULL );
-  
-  return TRUE;
+    if (!wxTheClipboard) return TRUE;
+
+    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)
+        {
+            wxLogTrace(TRACE_CLIPBOARD, wxT("wxClipboard will get cleared" ));
+
+            delete wxTheClipboard->m_data;
+            wxTheClipboard->m_data = (wxDataObject*) NULL;
+        }
+    }
+
+    wxTheClipboard->m_waiting = FALSE;
+    return TRUE;

 }
 
 //-----------------------------------------------------------------------------
 }
 
 //-----------------------------------------------------------------------------


@@ -126,31 +226,53 @@ selection_clear( GtkWidget *WXUNUSED(widget), GdkEventSelection *WXUNUSED(event)
 //-----------------------------------------------------------------------------
 
 static void
 //-----------------------------------------------------------------------------
 
 static void

-selection_handler( GtkWidget *WXUNUSED(widget), GtkSelectionData *selection_data, gpointer WXUNUSED(data) )
+selection_handler( GtkWidget *WXUNUSED(widget),
+                   GtkSelectionData *selection_data,
+                   guint WXUNUSED(info),
+                   guint WXUNUSED(time),
+                   gpointer WXUNUSED(data) )

 {
 {

-  if (!wxTheClipboard) return;
-  
-  wxDataObject *data_object = wxTheClipboard->m_data;
-  
-  if (!data_object) return;
-  
-  if (data_object->GetDataSize() == 0) return;  
-  
-  gint len = data_object->GetDataSize();
-  guchar *bin_data = (guchar*) malloc( len );
-  data_object->GetDataHere( (void*)bin_data );
-  
-  if (selection_data->target == GDK_SELECTION_TYPE_STRING)
-  {
-    gtk_selection_data_set( 
-      selection_data, GDK_SELECTION_TYPE_STRING, 8*sizeof(gchar), bin_data, len );
-  }
-  else if (selection_data->target == g_textAtom)
-  {
-    gtk_selection_data_set( 
-      selection_data, g_textAtom, 8*sizeof(gchar), bin_data, len );
-  }
-  free( bin_data );
+    if (!wxTheClipboard) return;
+
+    if (!wxTheClipboard->m_data) return;
+
+    wxDataObject *data = wxTheClipboard->m_data;
+
+    wxDataFormat format( selection_data->target );
+
+    if (!data->IsSupportedFormat( format )) return;
+
+    int size = data->GetDataSize( format );
+
+    if (size == 0) return;
+
+    void *d = malloc(size);
+
+    data->GetDataHere( selection_data->target, d );
+
+    // transform Unicode text into multibyte before putting it on clipboard
+#if wxUSE_UNICODE
+    if ( format.GetType() == wxDF_TEXT )
+    {
+        const wchar_t *wstr = (const wchar_t *)d;
+        size_t len = wxConvCurrent->WC2MB(NULL, wstr, 0);
+        char *str = malloc(len + 1);
+        wxConvCurrent->WC2MB(str, wstr, len);
+        str[len] = '\0';
+
+        free(d);
+        d = str;
+    }
+#endif // wxUSE_UNICODE
+
+    gtk_selection_data_set(
+        selection_data,
+        GDK_SELECTION_TYPE_STRING,
+        8*sizeof(gchar),
+        (unsigned char*) d,
+        size );
+
+    free(d);

 }
 
 //-----------------------------------------------------------------------------
 }
 
 //-----------------------------------------------------------------------------


@@ -161,182 +283,328 @@ IMPLEMENT_DYNAMIC_CLASS(wxClipboard,wxObject)
 
 wxClipboard::wxClipboard()
 {
 
 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()
 {
 }
 
 wxClipboard::~wxClipboard()
 {

-  Clear();  
-  
-  if (m_clipboardWidget) gtk_widget_destroy( m_clipboardWidget );
+    Clear();
+
+    if (m_clipboardWidget) gtk_widget_destroy( m_clipboardWidget );
+    if (m_targetsWidget) gtk_widget_destroy( m_targetsWidget );

 }
 
 void wxClipboard::Clear()
 {
 }
 
 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)
-  { 
-    delete m_data;
-    gtk_selection_owner_set( (GtkWidget*) NULL, GDK_SELECTION_PRIMARY, GDK_CURRENT_TIME );
-  }
-  
-  m_receivedSize = 0;
-  
-  if (m_receivedData)
-  {
-    delete[] m_receivedData;
-    m_receivedData = (char*) NULL;
-  }
-  
-  m_targetRequested = 0;
-  
-  m_formatSupported = FALSE;
+    if (m_data)
+    {
+#if wxUSE_THREADS
+        /* disable GUI threads */
+#endif
+
+        /*  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,
+                                     (guint32) 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,
+                                     (guint32) 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 */
+#endif
+    }
+
+    m_targetRequested = 0;
+    m_formatSupported = FALSE;

 }
 
 }
 

-void wxClipboard::SetData( wxDataObject *data )
+bool wxClipboard::Open()

 {
 {

-  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;
-  }
-  
-  switch (m_data->GetPreferredFormat())
-  {
-    case wxDF_TEXT:
-      gtk_selection_add_handler( m_clipboardWidget, 
-                                 g_clipboardAtom, 
-                                g_textAtom,
-                                selection_handler,
-                                NULL );
-      break;
-    default:
-      break;
-  }
+    wxCHECK_MSG( !m_open, FALSE, wxT("clipboard already open") );
+
+    m_open = TRUE;
+
+    return TRUE;

 }
 
 }
 

-bool wxClipboard::IsSupportedFormat( wxDataFormat format )
+bool wxClipboard::SetData( wxDataObject *data )

 {
 {

-  m_targetRequested = 0;
-  
-  if (format == wxDF_TEXT)
-  {
-//     m_targetRequested = g_textAtom;
-     m_targetRequested = GDK_TARGET_STRING;
-  }
-  
-  if (m_targetRequested == 0) return FALSE;
-
-  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;
+    wxCHECK_MSG( m_open, FALSE, wxT("clipboard not open") );
+
+    wxCHECK_MSG( data, FALSE, wxT("data is invalid") );
+
+    Clear();
+
+    return AddData( data );

 }
 
 }
 

-bool wxClipboard::ObtainData( wxDataFormat format )
+bool wxClipboard::AddData( wxDataObject *data )

 {
 {

-  m_receivedSize = 0;
-  
-  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;
-  }
-  
-  if (m_targetRequested == 0) return FALSE;
-
-  gtk_signal_connect( GTK_OBJECT(m_clipboardWidget), 
-                      "selection_received",
-                     GTK_SIGNAL_FUNC( selection_received ), 
-                     (gpointer) this );
-
-  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;
+    wxCHECK_MSG( m_open, FALSE, wxT("clipboard not open") );
+
+    wxCHECK_MSG( data, FALSE, wxT("data is invalid") );
+
+    /* we can only store one wxDataObject */
+    Clear();
+
+    m_data = data;
+
+    /* 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;
+
+
+    for (size_t i = 0; i < m_data->GetFormatCount(); i++)
+    {
+        wxLogTrace( TRACE_CLIPBOARD,
+                    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 */
+#endif
+
+    /* Tell the world we offer clipboard data */
+    bool res = (gtk_selection_owner_set( m_clipboardWidget,
+                                         clipboard,
+                                         (guint32) GDK_CURRENT_TIME ));
+
+    if (m_usePrimary)
+        m_ownsPrimarySelection = res;
+    else
+        m_ownsClipboard = res;
+
+#if wxUSE_THREADS
+    /* re-enable GUI threads */
+#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_waiting) return FALSE;

 
 

-IMPLEMENT_DYNAMIC_CLASS(wxClipboardModule,wxModule)
+    /* store requested format to be asked for by callbacks */
+    m_targetRequested = format;

 
 

-bool wxClipboardModule::OnInit()
-{
-  wxTheClipboard = new wxClipboard();
-  
-  return TRUE;
+#if 0
+    wxLogTrace( TRACE_CLIPBOARD,
+                wxT("wxClipboard:IsSupported: requested format: %s"),
+                format.GetId().c_str() );
+#endif
+
+    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 */
+
+    m_waiting = TRUE;
+
+    gtk_selection_convert( m_targetsWidget,
+                           m_usePrimary ? (GdkAtom)GDK_SELECTION_PRIMARY
+                                        : g_clipboardAtom,
+                           g_targetsAtom,
+                           (guint32) GDK_CURRENT_TIME );
+
+    while (m_waiting) gtk_main_iteration();
+
+    if (!m_formatSupported) return FALSE;
+
+    return TRUE;

 }
 
 }
 

-void wxClipboardModule::OnExit()
+bool wxClipboard::GetData( wxDataObject& data )

 {
 {

-  if (wxTheClipboard) delete wxTheClipboard;
-  wxTheClipboard = (wxClipboard*) NULL;
+    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] );
+
+        wxLogTrace( TRACE_CLIPBOARD,
+                    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;
+
+        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 */
+
+        m_waiting = TRUE;
+
+        gtk_selection_convert( m_targetsWidget,
+                           m_usePrimary ? (GdkAtom)GDK_SELECTION_PRIMARY
+                                        : g_clipboardAtom,
+                           g_targetsAtom,
+                           (guint32) 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;
+
+        wxLogTrace( TRACE_CLIPBOARD,
+                    wxT("wxClipboard::GetData: format found, start convert") );
+
+        gtk_selection_convert( m_clipboardWidget,
+                               m_usePrimary ? (GdkAtom)GDK_SELECTION_PRIMARY
+                                            : g_clipboardAtom,
+                               m_targetRequested,
+                               (guint32) 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;
+    }
+
+    wxLogTrace( TRACE_CLIPBOARD,
+                wxT("wxClipboard::GetData: format not found") );
+
+    /* return failure */
+    delete[] array;
+    return FALSE;

 }
 }

+
+#endif
+  // wxUSE_CLIPBOARD
+