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[wxWidgets.git] / src / gtk / dnd.cpp
diff --git a/src/gtk/dnd.cpp b/src/gtk/dnd.cpp
index 9a3b2b08eae4ed6bba9b8b8a4eacd1ab17610129..fdfeb4fade71e69a732008e29b9ec544ea9f1c9a 100644 (file)
--- a/src/gtk/dnd.cpp
+++ b/src/gtk/dnd.cpp
@@ -2,295 +2,864 @@
 // Name:        dnd.cpp
 // Purpose:     wxDropTarget class
 // Author:      Robert Roebling
 // Name:        dnd.cpp
 // Purpose:     wxDropTarget class
 // Author:      Robert Roebling
-// Copyright:   Robert Roebling
-// Licence:     wxWindows license
+// Id:          $Id$
+// Copyright:   (c) 1998 Robert Roebling
+// Licence:     wxWindows licence
 ///////////////////////////////////////////////////////////////////////////////
 
 #ifdef __GNUG__
 ///////////////////////////////////////////////////////////////////////////////
 
 #ifdef __GNUG__
-#pragma implementation "dnd.h"
+    #pragma implementation "dnd.h"
 #endif
 
 #include "wx/dnd.h"
 #endif
 
 #include "wx/dnd.h"
+
+#if wxUSE_DRAG_AND_DROP
+
 #include "wx/window.h"
 #include "wx/app.h"
 #include "wx/gdicmn.h"
 #include "wx/window.h"
 #include "wx/app.h"
 #include "wx/gdicmn.h"
-#include <wx/intl.h>
+#include "wx/intl.h"
+#include "wx/utils.h"
 
 
-#include "gdk/gdkprivate.h"
+#include <gdk/gdk.h>
+#include <gtk/gtk.h>
+#include <gdk/gdkprivate.h>
 
 
-#include <X11/Xlib.h>
+#include <gtk/gtkdnd.h>
+#include <gtk/gtkselection.h>
 
 
-// ----------------------------------------------------------------------------
-// global
-// ----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+// idle system
+//-----------------------------------------------------------------------------
+
+extern void wxapp_install_idle_handler();
+extern bool g_isIdle;
+
+//-----------------------------------------------------------------------------
+// thread system
+//-----------------------------------------------------------------------------
+
+#if wxUSE_THREADS
+extern void wxapp_install_thread_wakeup();
+extern void wxapp_uninstall_thread_wakeup();
+#endif
+
+//----------------------------------------------------------------------------
+// global data
+//----------------------------------------------------------------------------
 
 extern bool g_blockEventsOnDrag;
 
 
 extern bool g_blockEventsOnDrag;
 
+// the trace mask we use with wxLogTrace() - call
+// wxLog::AddTraceMask(TRACE_DND) to enable the trace messages from here
+// (there are quite a few of them, so don't enable this by default)
+static const wxChar *TRACE_DND = _T("dnd");
+
+//----------------------------------------------------------------------------
+// standard icons
+//----------------------------------------------------------------------------
+
+/* XPM */
+static char * page_xpm[] = {
+/* width height ncolors chars_per_pixel */
+"32 32 5 1",
+/* colors */
+"         s None        c None",
+".        c black",
+"X        c wheat",
+"o        c tan",
+"O        c #6699FF",
+/* pixels */
+"    ...................         ",
+"    .XXXXXXXXXXXXXXXXX..        ",
+"    .XXXXXXXXXXXXXXXXX.o.       ",
+"    .XXXXXXXXXXXXXXXXX.oo.      ",
+"    .XXXXXXXXXXXXXXXXX.ooo.     ",
+"    .XXXXXXXXXXXXXXXXX.oooo.    ",
+"    .XXXXXXXXXXXXXXXXX.......   ",
+"    .XXXXXOOOOOOOOOOXXXooooo.   ",
+"    .XXXXXXXXXXXXXXXXXXooooo.   ",
+"    .XXXXXOOOOOOOOOOXXXXXXXX.   ",
+"    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
+"    .XXXXXXXOOOOOOOOOXXXXXXX.   ",
+"    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
+"    .XXXXXXOOOOOOOOOOXXXXXXX.   ",
+"    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
+"    .XXXXXOOOOOOOOOOXXXXXXXX.   ",
+"    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
+"    .XXXXXXXOOOOOOOOOXXXXXXX.   ",
+"    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
+"    .XXXXXXOOOOOOOOOOXXXXXXX.   ",
+"    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
+"    .XXXXXOOOOOOOOOOXXXXXXXX.   ",
+"    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
+"    .XXXXXXOOOOOOOOOOXXXXXXX.   ",
+"    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
+"    .XXXXXOOOOOOOXXXXXXXXXXX.   ",
+"    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
+"    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
+"    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
+"    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
+"    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
+"    .........................   "};
+
+
+
 // ----------------------------------------------------------------------------
 // ----------------------------------------------------------------------------
-// wxDropTarget
+// "drag_leave"
 // ----------------------------------------------------------------------------
 
 // ----------------------------------------------------------------------------
 
-wxDropTarget::wxDropTarget()
+static void target_drag_leave( GtkWidget *WXUNUSED(widget),
+                               GdkDragContext *context,
+                               guint WXUNUSED(time),
+                               wxDropTarget *drop_target )
 {
 {
-};
+    if (g_isIdle) wxapp_install_idle_handler();
 
 
-wxDropTarget::~wxDropTarget()
-{
-};
+    /* inform the wxDropTarget about the current GdkDragContext.
+       this is only valid for the duration of this call */
+    drop_target->SetDragContext( context );
 
 
-void wxDropTarget::Drop( GdkEvent *event, int x, int y )
-{
-  printf( "Drop data is of type %s.\n", event->dropdataavailable.data_type );
-  
-  OnDrop( x, y, (char *)event->dropdataavailable.data);
-};
+    /* we don't need return values. this event is just for
+       information */
+    drop_target->OnLeave();
 
 
-void wxDropTarget::UnregisterWidget( GtkWidget *widget )
+    /* this has to be done because GDK has no "drag_enter" event */
+    drop_target->m_firstMotion = TRUE;
+
+    /* after this, invalidate the drop_target's GdkDragContext */
+    drop_target->SetDragContext( (GdkDragContext*) NULL );
+}
+
+// ----------------------------------------------------------------------------
+// "drag_motion"
+// ----------------------------------------------------------------------------
+
+static gboolean target_drag_motion( GtkWidget *WXUNUSED(widget),
+                                    GdkDragContext *context,
+                                    gint x,
+                                    gint y,
+                                    guint time,
+                                    wxDropTarget *drop_target )
 {
 {
-  if (!widget) return;
-  
-  gtk_widget_dnd_drop_set( widget, FALSE, NULL, 0, FALSE );
-};
+    if (g_isIdle) wxapp_install_idle_handler();
 
 
-void wxDropTarget::RegisterWidget( GtkWidget *widget )
+    /* Owen Taylor: "if the coordinates not in a drop zone,
+       return FALSE, otherwise call gtk_drag_status() and
+       return TRUE" */
+
+    /* inform the wxDropTarget about the current GdkDragContext.
+       this is only valid for the duration of this call */
+    drop_target->SetDragContext( context );
+
+    wxDragResult result;
+    if ( context->suggested_action == GDK_ACTION_COPY )
+        result = wxDragCopy;
+    else
+        result = wxDragMove;
+
+    if (drop_target->m_firstMotion)
+    {
+        /* the first "drag_motion" event substitutes a "drag_enter" event */
+        result = drop_target->OnEnter( x, y, result );
+    }
+    else
+    {
+        /* give program a chance to react (i.e. to say no by returning FALSE) */
+        result = drop_target->OnDragOver( x, y, result );
+    }
+
+    bool ret = wxIsDragResultOk( result );
+    if (ret)
+    {
+        GdkDragAction action;
+        if (result == wxDragCopy)
+            action = GDK_ACTION_COPY;
+        else
+            action = GDK_ACTION_MOVE;
+
+        gdk_drag_status( context, action, time );
+    }
+
+    /* after this, invalidate the drop_target's GdkDragContext */
+    drop_target->SetDragContext( (GdkDragContext*) NULL );
+
+    /* this has to be done because GDK has no "drag_enter" event */
+    drop_target->m_firstMotion = FALSE;
+
+    return ret;
+}
+
+// ----------------------------------------------------------------------------
+// "drag_drop"
+// ----------------------------------------------------------------------------
+
+static gboolean target_drag_drop( GtkWidget *widget,
+                                  GdkDragContext *context,
+                                  gint x,
+                                  gint y,
+                                  guint time,
+                                  wxDropTarget *drop_target )
 {
 {
-  wxString formats;
-  int valid = 0;
-  
-  for ( uint i = 0; i < GetFormatCount(); i++ )
-  {
-    wxDataFormat df = GetFormat( i );
-    switch (df) 
+    if (g_isIdle) wxapp_install_idle_handler();
+
+    /* Owen Taylor: "if the drop is not in a drop zone,
+       return FALSE, otherwise, if you aren't accepting
+       the drop, call gtk_drag_finish() with success == FALSE
+       otherwise call gtk_drag_data_get()" */
+
+//    printf( "drop.\n" );
+
+    /* this seems to make a difference between not accepting
+       due to wrong target area and due to wrong format. let
+       us hope that this is not required.. */
+
+    /* inform the wxDropTarget about the current GdkDragContext.
+       this is only valid for the duration of this call */
+    drop_target->SetDragContext( context );
+
+    /* inform the wxDropTarget about the current drag widget.
+       this is only valid for the duration of this call */
+    drop_target->SetDragWidget( widget );
+
+    /* inform the wxDropTarget about the current drag time.
+       this is only valid for the duration of this call */
+    drop_target->SetDragTime( time );
+
+/*
+    wxDragResult result = wxDragMove;
+    if (context->suggested_action == GDK_ACTION_COPY) result = wxDragCopy;
+*/
+
+    /* reset the block here as someone might very well
+       show a dialog as a reaction to a drop and this
+       wouldn't work without events */
+    g_blockEventsOnDrag = FALSE;
+
+    bool ret = drop_target->OnDrop( x, y );
+
+    if (!ret)
     {
     {
-      case wxDF_TEXT:
-       if (i > 0) formats += ";";
-        formats += "text/plain";
-       valid++;
-       break;
-      case wxDF_FILENAME:
-       if (i > 0) formats += ";";
-        formats += "url:any";
-       valid++;
-       break;
-      default:
-        break;
-    };
-  }
-  
-  char *str = WXSTRINGCAST formats;
-  
-  gtk_widget_dnd_drop_set( widget, TRUE, &str, valid, FALSE );
-};
+        wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned FALSE") );
+
+        /* cancel the whole thing */
+        gtk_drag_finish( context,
+                          FALSE,        /* no success */
+                          FALSE,        /* don't delete data on dropping side */
+                          time );
+    }
+    else
+    {
+        wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned TRUE") );
+
+#if wxUSE_THREADS
+        /* disable GUI threads */
+        wxapp_uninstall_thread_wakeup();
+#endif
+
+        GdkAtom format = drop_target->GetMatchingPair();
+        wxASSERT( format );
+
+/*
+        GdkDragAction action = GDK_ACTION_MOVE;
+        if (result == wxDragCopy) action == GDK_ACTION_COPY;
+        context->action = action;
+*/
+        /* this should trigger an "drag_data_received" event */
+        gtk_drag_get_data( widget,
+                           context,
+                           format,
+                           time );
+
+#if wxUSE_THREADS
+        /* re-enable GUI threads */
+        wxapp_install_thread_wakeup();
+#endif
+    }
+
+    /* after this, invalidate the drop_target's GdkDragContext */
+    drop_target->SetDragContext( (GdkDragContext*) NULL );
+
+    /* after this, invalidate the drop_target's drag widget */
+    drop_target->SetDragWidget( (GtkWidget*) NULL );
+
+    /* this has to be done because GDK has no "drag_enter" event */
+    drop_target->m_firstMotion = TRUE;
+
+    return ret;
+}
 
 // ----------------------------------------------------------------------------
 
 // ----------------------------------------------------------------------------
-// wxTextDropTarget
+// "drag_data_received"
 // ----------------------------------------------------------------------------
 
 // ----------------------------------------------------------------------------
 
-bool wxTextDropTarget::OnDrop( long x, long y, const void *pData )
+static void target_drag_data_received( GtkWidget *WXUNUSED(widget),
+                                       GdkDragContext *context,
+                                       gint x,
+                                       gint y,
+                                       GtkSelectionData *data,
+                                       guint WXUNUSED(info),
+                                       guint time,
+                                       wxDropTarget *drop_target )
 {
 {
-  OnDropText( x, y, (const char*)pData );
-  return TRUE;
-};
+    if (g_isIdle) wxapp_install_idle_handler();
+
+    /* Owen Taylor: "call gtk_drag_finish() with
+       success == TRUE" */
+
+    if ((data->length <= 0) || (data->format != 8))
+    {
+        /* negative data length and non 8-bit data format
+           qualifies for junk */
+        gtk_drag_finish (context, FALSE, FALSE, time);
+
+        return;
+    }
+
+    wxLogTrace(TRACE_DND, wxT( "Drop target: data received event") );
+
+    /* inform the wxDropTarget about the current GtkSelectionData.
+       this is only valid for the duration of this call */
+    drop_target->SetDragData( data );
+
+    wxDragResult result;
+    if ( context->suggested_action == GDK_ACTION_COPY )
+        result = wxDragCopy;
+    else
+        result = wxDragMove;
+
+    if ( wxIsDragResultOk( drop_target->OnData( x, y, result ) ) )
+    {
+        wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned TRUE") );
+
+        /* tell GTK that data transfer was successfull */
+        gtk_drag_finish( context, TRUE, FALSE, time );
+    }
+    else
+    {
+        wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned FALSE") );
+
+        /* tell GTK that data transfer was not successfull */
+        gtk_drag_finish( context, FALSE, FALSE, time );
+    }
 
 
-bool wxTextDropTarget::OnDropText( long x, long y, const char *psz )
+    /* after this, invalidate the drop_target's drag data */
+    drop_target->SetDragData( (GtkSelectionData*) NULL );
+}
+
+//----------------------------------------------------------------------------
+// wxDropTarget
+//----------------------------------------------------------------------------
+
+wxDropTarget::wxDropTarget( wxDataObject *data )
+            : wxDropTargetBase( data )
 {
 {
-  printf( "Got dropped text: %s.\n", psz );
-  printf( "At x: %d, y: %d.\n", (int)x, (int)y );
-  return TRUE;
-};
+    m_firstMotion = TRUE;
+    m_dragContext = (GdkDragContext*) NULL;
+    m_dragWidget = (GtkWidget*) NULL;
+    m_dragData = (GtkSelectionData*) NULL;
+    m_dragTime = 0;
+}
 
 
-size_t wxTextDropTarget::GetFormatCount() const
+wxDragResult wxDropTarget::OnDragOver( wxCoord WXUNUSED(x),
+                                       wxCoord WXUNUSED(y),
+                                       wxDragResult def )
 {
 {
-  return 1;
+    // GetMatchingPair() checks for m_dataObject too, no need to do it here
+
+    // disable the debug message from GetMatchingPair() - there are too many
+    // of them otherwise
+#ifdef __WXDEBUG__
+    wxLogNull noLog;
+#endif // Debug
+
+    return (GetMatchingPair() != (GdkAtom) 0) ? def : wxDragNone;
 }
 
 }
 
-wxDataFormat wxTextDropTarget::GetFormat(size_t WXUNUSED(n)) const
+bool wxDropTarget::OnDrop( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y) )
 {
 {
-  return wxDF_TEXT;
+    if (!m_dataObject)
+        return FALSE;
+
+    return (GetMatchingPair() != (GdkAtom) 0);
 }
 
 }
 
-// ----------------------------------------------------------------------------
-// wxFileDropTarget
-// ----------------------------------------------------------------------------
+wxDragResult wxDropTarget::OnData( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
+                                   wxDragResult def )
+{
+    if (!m_dataObject)
+        return wxDragNone;
+
+    if (GetMatchingPair() == (GdkAtom) 0)
+        return wxDragNone;
+
+    return GetData() ? def : wxDragNone;
+}
 
 
-bool wxFileDropTarget::OnDropFiles( long x, long y, size_t nFiles, const char * const WXUNUSED(aszFiles)[] )
+GdkAtom wxDropTarget::GetMatchingPair()
 {
 {
-  printf( "Got %d dropped files.\n", (int)nFiles );
-  printf( "At x: %d, y: %d.\n", (int)x, (int)y );
-  return TRUE;
+    if (!m_dataObject)
+        return (GdkAtom) 0;
+
+    if (!m_dragContext)
+        return (GdkAtom) 0;
+
+    GList *child = m_dragContext->targets;
+    while (child)
+    {
+        GdkAtom formatAtom = (GdkAtom) GPOINTER_TO_INT(child->data);
+        wxDataFormat format( formatAtom );
+
+#ifdef __WXDEBUG__
+        wxLogTrace(TRACE_DND, wxT("Drop target: drag has format: %s"),
+                   format.GetId().c_str());
+#endif // Debug
+
+        if (m_dataObject->IsSupportedFormat( format ))
+            return formatAtom;
+
+        child = child->next;
+    }
+
+    return (GdkAtom) 0;
 }
 
 }
 
-bool wxFileDropTarget::OnDrop(long x, long y, const void *WXUNUSED(pData) )
+bool wxDropTarget::GetData()
 {
 {
-  char *str = "/this/is/a/path.txt";
+    if (!m_dragData)
+        return FALSE;
+
+    if (!m_dataObject)
+        return FALSE;
+
+    wxDataFormat dragFormat( m_dragData->target );
+
+    if (!m_dataObject->IsSupportedFormat( dragFormat ))
+        return FALSE;
 
 
-  return OnDropFiles(x, y, 1, &str ); 
+    m_dataObject->SetData( dragFormat, (size_t)m_dragData->length, (const void*)m_dragData->data );
+
+    return TRUE;
 }
 
 }
 
-size_t wxFileDropTarget::GetFormatCount() const
+void wxDropTarget::UnregisterWidget( GtkWidget *widget )
 {
 {
-  return 1;
+    wxCHECK_RET( widget != NULL, wxT("unregister widget is NULL") );
+
+    gtk_drag_dest_unset( widget );
+
+    gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
+                      GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
+
+    gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
+                      GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
+
+    gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
+                      GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
+
+    gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
+                      GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
 }
 
 }
 
-wxDataFormat wxFileDropTarget::GetFormat(size_t WXUNUSED(n)) const
+void wxDropTarget::RegisterWidget( GtkWidget *widget )
 {
 {
-  return wxDF_FILENAME;
+    wxCHECK_RET( widget != NULL, wxT("register widget is NULL") );
+
+    /* gtk_drag_dest_set() determines what default behaviour we'd like
+       GTK to supply. we don't want to specify out targets (=formats)
+       or actions in advance (i.e. not GTK_DEST_DEFAULT_MOTION and
+       not GTK_DEST_DEFAULT_DROP). instead we react individually to
+       "drag_motion" and "drag_drop" events. this makes it possible
+       to allow dropping on only a small area. we should set
+       GTK_DEST_DEFAULT_HIGHLIGHT as this will switch on the nice
+       highlighting if dragging over standard controls, but this
+       seems to be broken without the other two. */
+
+    gtk_drag_dest_set( widget,
+                       (GtkDestDefaults) 0,         /* no default behaviour */
+                       (GtkTargetEntry*) NULL,      /* we don't supply any formats here */
+                       0,                           /* number of targets = 0 */
+                       (GdkDragAction) 0 );         /* we don't supply any actions here */
+
+    gtk_signal_connect( GTK_OBJECT(widget), "drag_leave",
+                      GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
+
+    gtk_signal_connect( GTK_OBJECT(widget), "drag_motion",
+                      GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
+
+    gtk_signal_connect( GTK_OBJECT(widget), "drag_drop",
+                      GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
+
+    gtk_signal_connect( GTK_OBJECT(widget), "drag_data_received",
+                      GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
 }
 
 }
 
-//-------------------------------------------------------------------------
-// wxDropSource
-//-------------------------------------------------------------------------
+//----------------------------------------------------------------------------
+// "drag_data_get"
+//----------------------------------------------------------------------------
+
+static void
+source_drag_data_get  (GtkWidget          *WXUNUSED(widget),
+                       GdkDragContext     *WXUNUSED(context),
+                       GtkSelectionData   *selection_data,
+                       guint               WXUNUSED(info),
+                       guint               WXUNUSED(time),
+                       wxDropSource       *drop_source )
+{
+    if (g_isIdle) wxapp_install_idle_handler();
+
+    wxDataFormat format( selection_data->target );
+
+    wxLogTrace(TRACE_DND, wxT("Drop source: format requested: %s"),
+               format.GetId().c_str());
+
+    drop_source->m_retValue = wxDragCancel;
+
+    wxDataObject *data = drop_source->GetDataObject();
+
+    if (!data)
+    {
+        wxLogTrace(TRACE_DND, wxT("Drop source: no data object") );
+        return;
+    }
+
+    if (!data->IsSupportedFormat(format))
+    {
+        wxLogTrace(TRACE_DND, wxT("Drop source: unsupported format") );
+        return;
+    }
+
+    if (data->GetDataSize(format) == 0)
+    {
+        wxLogTrace(TRACE_DND, wxT("Drop source: empty data") );
+        return;
+    }
+
+    size_t size = data->GetDataSize(format);
+
+//  printf( "data size: %d.\n", (int)data_size );
+
+    guchar *d = new guchar[size];
+
+    if (!data->GetDataHere( format, (void*)d ))
+    {
+        delete[] d;
+        return;
+    }
+
+#if wxUSE_THREADS
+    /* disable GUI threads */
+    wxapp_uninstall_thread_wakeup();
+#endif
+
+                gtk_selection_data_set( selection_data,
+                                        selection_data->target,
+                                        8,   // 8-bit
+                                        d,
+                                        size );
+
+#if wxUSE_THREADS
+    /* enable GUI threads */
+    wxapp_install_thread_wakeup();
+#endif
+
+    delete[] d;
+}
+
+//----------------------------------------------------------------------------
+// "drag_data_delete"
+//----------------------------------------------------------------------------
+
+static void source_drag_data_delete( GtkWidget          *WXUNUSED(widget),
+                                     GdkDragContext     *WXUNUSED(context),
+                                     wxDropSource       *WXUNUSED(drop_source) )
+{
+    if (g_isIdle)
+        wxapp_install_idle_handler();
+
+    // printf( "Drag source: drag_data_delete\n" );
+}
+
+//----------------------------------------------------------------------------
+// "drag_begin"
+//----------------------------------------------------------------------------
+
+static void source_drag_begin( GtkWidget          *WXUNUSED(widget),
+                               GdkDragContext     *WXUNUSED(context),
+                               wxDropSource       *WXUNUSED(drop_source) )
+{
+    if (g_isIdle)
+        wxapp_install_idle_handler();
+
+    // printf( "Drag source: drag_begin.\n" );
+}
+
+//----------------------------------------------------------------------------
+// "drag_end"
+//----------------------------------------------------------------------------
+
+static void source_drag_end( GtkWidget          *WXUNUSED(widget),
+                             GdkDragContext     *WXUNUSED(context),
+                             wxDropSource       *drop_source )
+{
+    if (g_isIdle) wxapp_install_idle_handler();
+
+    // printf( "Drag source: drag_end.\n" );
+
+    drop_source->m_waiting = FALSE;
+}
 
 //-----------------------------------------------------------------------------
 
 //-----------------------------------------------------------------------------
-// drag request
+// "configure_event" from m_iconWindow
+//-----------------------------------------------------------------------------
 
 
-void gtk_drag_callback( GtkWidget *widget, GdkEvent *event, wxDataObject *data )
+static gint
+gtk_dnd_window_configure_callback( GtkWidget *WXUNUSED(widget), GdkEventConfigure *WXUNUSED(event), wxDropSource *source )
 {
 {
-  printf( "Data requested for dropping.\n" );
-  
-  uint size = data->GetDataSize();
-  char *ptr = new char[size];
-  data->GetDataHere( ptr );
-  
-  gtk_widget_dnd_data_set( widget, event, ptr, size );
-  
-  delete ptr;
-};
-
-wxDropSource::wxDropSource( wxWindow *win )
+    if (g_isIdle)
+        wxapp_install_idle_handler();
+
+    wxDragResult action = wxDragNone;
+    if (source->m_dragContext->action == GDK_ACTION_COPY) action = wxDragCopy;
+    if (source->m_dragContext->action == GDK_ACTION_MOVE) action = wxDragMove;
+
+    source->GiveFeedback( action );
+
+    return 0;
+}
+
+//---------------------------------------------------------------------------
+// wxDropSource
+//---------------------------------------------------------------------------
+
+wxDropSource::wxDropSource(wxWindow *win,
+                           const wxIcon &iconCopy,
+                           const wxIcon &iconMove,
+                           const wxIcon &iconNone)
 {
 {
-  g_blockEventsOnDrag = TRUE;
-  
-  m_window = win;
-  m_widget = win->m_widget;
-  if (win->m_wxwindow) m_widget = win->m_wxwindow;
-  
-  m_data = NULL;  
-
-  m_defaultCursor = wxCursor( wxCURSOR_NO_ENTRY );
-  m_goaheadCursor = wxCursor( wxCURSOR_HAND );
-};
-
-wxDropSource::wxDropSource( wxDataObject &data, wxWindow *win )
+    m_waiting = TRUE;
+
+    m_iconWindow = (GtkWidget*) NULL;
+
+    m_window = win;
+    m_widget = win->m_widget;
+    if (win->m_wxwindow) m_widget = win->m_wxwindow;
+
+    m_retValue = wxDragCancel;
+
+    SetIcons(iconCopy, iconMove, iconNone);
+}
+
+wxDropSource::wxDropSource(wxDataObject& data,
+                           wxWindow *win,
+                           const wxIcon &iconCopy,
+                           const wxIcon &iconMove,
+                           const wxIcon &iconNone)
 {
 {
-  g_blockEventsOnDrag = TRUE;
-  
-  m_window = win;
-  m_widget = win->m_widget;
-  if (win->m_wxwindow) m_widget = win->m_wxwindow;
-  
-  m_data = &data;
-
-  m_defaultCursor = wxCursor( wxCURSOR_NO_ENTRY );
-  m_goaheadCursor = wxCursor( wxCURSOR_HAND );
-};
-
-void wxDropSource::SetData( wxDataObject &data )
+    m_waiting = TRUE;
+
+    SetData( data );
+
+    m_iconWindow = (GtkWidget*) NULL;
+
+    m_window = win;
+    m_widget = win->m_widget;
+    if (win->m_wxwindow) m_widget = win->m_wxwindow;
+
+    m_retValue = wxDragCancel;
+
+    SetIcons(iconCopy, iconMove, iconNone);
+}
+
+void wxDropSource::SetIcons(const wxIcon &iconCopy,
+                            const wxIcon &iconMove,
+                            const wxIcon &iconNone)
 {
 {
-  m_data = &data;  
-};
+    m_iconCopy = iconCopy;
+    m_iconMove = iconMove;
+    m_iconNone = iconNone;
+
+    if ( !m_iconCopy.Ok() )
+        m_iconCopy = wxIcon(page_xpm);
+    if ( !m_iconMove.Ok() )
+        m_iconMove = m_iconCopy;
+    if ( !m_iconNone.Ok() )
+        m_iconNone = m_iconCopy;
+}
 
 
-wxDropSource::~wxDropSource(void)
+wxDropSource::~wxDropSource()
 {
 {
-//  if (m_data) delete m_data;
+}
 
 
-  g_blockEventsOnDrag = FALSE;
-};
-   
-wxDropSource::DragResult wxDropSource::DoDragDrop( bool WXUNUSED(bAllowMove) )
+void wxDropSource::PrepareIcon( int action, GdkDragContext *context )
 {
 {
-  if (gdk_dnd.dnd_grabbed) return None;
-  if (gdk_dnd.drag_really) return None;
-  
-  if (!m_data) return None;
-  if (m_data->GetDataSize() == 0) return None;
-  
-  GdkWindowPrivate *wp = (GdkWindowPrivate*) m_widget->window;
-  
-  RegisterWindow();
-  
-  gdk_dnd.drag_perhaps = TRUE;
-
-  gdk_dnd.dnd_drag_start.x = 5;
-  gdk_dnd.dnd_drag_start.y = 5;
-  gdk_dnd.real_sw = wp;
-         
-  if (gdk_dnd.drag_startwindows)
-  {
-    g_free( gdk_dnd.drag_startwindows );
-    gdk_dnd.drag_startwindows = NULL;
-  };
-  gdk_dnd.drag_numwindows = gdk_dnd.drag_really = 0;
-  
-  XWindowAttributes dnd_winattr;
-  XGetWindowAttributes( gdk_display, wp->xwindow, &dnd_winattr );
-  wp->dnd_drag_savedeventmask = dnd_winattr.your_event_mask;
-  
-  gdk_dnd_drag_addwindow( m_widget->window );
-  
-  GdkEventDragBegin ev;
-  ev.type = GDK_DRAG_BEGIN;
-  ev.window = m_widget->window;
-  ev.u.allflags = 0;
-  ev.u.flags.protocol_version = DND_PROTOCOL_VERSION;
-  
-  gdk_event_put( (GdkEvent*)&ev );
-  
-  XGrabPointer( gdk_display, wp->xwindow, False, 
-                ButtonMotionMask | ButtonPressMask | ButtonReleaseMask | PointerMotionMask,
-               GrabModeAsync, GrabModeAsync, gdk_root_window, None, CurrentTime );
-               
-  gdk_dnd_set_drag_cursors( m_defaultCursor.GetCursor(), m_goaheadCursor.GetCursor() );
-  
-  gdk_dnd.dnd_grabbed = TRUE;
-  gdk_dnd.drag_really = 1;
-  
-  int x = 0;
-  int y = 0;
-  gdk_window_get_pointer( m_widget->window, &x, &y, NULL );
-  
-  gdk_dnd_display_drag_cursor( x, y, FALSE, TRUE );
-  
-  while (gdk_dnd.drag_really || gdk_dnd.drag_perhaps) wxYield();
-  
-  UnregisterWindow();
-  
-  return Copy;
-};
-
-void wxDropSource::RegisterWindow(void)
+    // get the right icon to display
+    wxIcon *icon = NULL;
+    if ( action & GDK_ACTION_MOVE )
+        icon = &m_iconMove;
+    else if ( action & GDK_ACTION_COPY )
+        icon = &m_iconCopy;
+    else
+        icon = &m_iconNone;
+
+    GdkBitmap *mask;
+    if ( icon->GetMask() )
+        mask = icon->GetMask()->GetBitmap();
+    else
+        mask = (GdkBitmap *)NULL;
+
+    GdkPixmap *pixmap = icon->GetPixmap();
+
+    gint width,height;
+    gdk_window_get_size (pixmap, &width, &height);
+
+    GdkColormap *colormap = gtk_widget_get_colormap( m_widget );
+#ifndef __WXGTK20__
+    gtk_widget_push_visual (gdk_colormap_get_visual (colormap));
+#endif
+    gtk_widget_push_colormap (colormap);
+
+    m_iconWindow = gtk_window_new (GTK_WINDOW_POPUP);
+    gtk_widget_set_events (m_iconWindow, GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK);
+    gtk_widget_set_app_paintable (GTK_WIDGET (m_iconWindow), TRUE);
+
+#ifndef __WXGTK20__
+    gtk_widget_pop_visual ();
+#endif
+    gtk_widget_pop_colormap ();
+
+    gtk_widget_set_usize (m_iconWindow, width, height);
+    gtk_widget_realize (m_iconWindow);
+
+    gtk_signal_connect( GTK_OBJECT(m_iconWindow), "configure_event",
+        GTK_SIGNAL_FUNC(gtk_dnd_window_configure_callback), (gpointer)this );
+
+    gdk_window_set_back_pixmap (m_iconWindow->window, pixmap, FALSE);
+
+    if (mask)
+        gtk_widget_shape_combine_mask (m_iconWindow, mask, 0, 0);
+
+    gtk_drag_set_icon_widget( context, m_iconWindow, 0, 0 );
+}
+
+wxDragResult wxDropSource::DoDragDrop( bool allowMove )
 {
 {
-  if (!m_data) return;
+    wxASSERT_MSG( m_data, wxT("Drop source: no data") );
+
+    if (!m_data)
+        return (wxDragResult) wxDragNone;
 
 
-  wxString formats;
-    
-  wxDataFormat df = m_data->GetPreferredFormat();
-  
-    switch (df) 
+    if (m_data->GetFormatCount() == 0)
+        return (wxDragResult) wxDragNone;
+
+    // still in drag
+    if (g_blockEventsOnDrag)
+        return (wxDragResult) wxDragNone;
+
+    // disabled for now
+    g_blockEventsOnDrag = TRUE;
+
+    RegisterWindow();
+
+    m_waiting = TRUE;
+
+    GtkTargetList *target_list = gtk_target_list_new( (GtkTargetEntry*) NULL, 0 );
+
+    wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
+    m_data->GetAllFormats( array );
+    for (size_t i = 0; i < m_data->GetFormatCount(); i++)
     {
     {
-      case wxDF_TEXT: 
-        formats += "text/plain";
-       break;
-      case wxDF_FILENAME:
-        formats += "url:any";
-       break;
-      default:
-        break;
+        GdkAtom atom = array[i];
+        wxLogTrace(TRACE_DND, wxT("Drop source: Supported atom %s"), gdk_atom_name( atom ));
+        gtk_target_list_add( target_list, atom, 0, 0 );
     }
     }
-  
-  char *str = WXSTRINGCAST formats;
-  
-  gtk_widget_dnd_drag_set( m_widget, TRUE, &str, 1 );
+    delete[] array;
+
+    GdkEventMotion event;
+    event.window = m_widget->window;
+    int x = 0;
+    int y = 0;
+    GdkModifierType state;
+    gdk_window_get_pointer( event.window, &x, &y, &state );
+    event.x = x;
+    event.y = y;
+    event.state = state;
+    event.time = (guint32)GDK_CURRENT_TIME;
+
+    /* GTK wants to know which button was pressed which caused the dragging */
+    int button_number = 0;
+    if (event.state & GDK_BUTTON1_MASK) button_number = 1;
+    else if (event.state & GDK_BUTTON2_MASK) button_number = 2;
+    else if (event.state & GDK_BUTTON3_MASK) button_number = 3;
+
+#if wxUSE_THREADS
+    /* disable GUI threads */
+    wxapp_uninstall_thread_wakeup();
+#endif
 
 
-  gtk_signal_connect( GTK_OBJECT(m_widget), "drag_request_event",
-    GTK_SIGNAL_FUNC(gtk_drag_callback), (gpointer)m_data );
-};
+    /* don't start dragging if no button is down */
+    if (button_number)
+    {
+        GdkDragAction action = GDK_ACTION_COPY;
+        if (allowMove) action = (GdkDragAction)(GDK_ACTION_MOVE|GDK_ACTION_COPY);
+        GdkDragContext *context = gtk_drag_begin( m_widget,
+                target_list,
+                action,
+                button_number,  /* number of mouse button which started drag */
+                (GdkEvent*) &event );
+
+        m_dragContext = context;
+
+        PrepareIcon( action, context );
+
+        while (m_waiting) gtk_main_iteration();
 
 
-void wxDropSource::UnregisterWindow(void)
+        if (context->action == GDK_ACTION_COPY)
+            m_retValue = wxDragCopy;
+        if (context->action == GDK_ACTION_MOVE)
+            m_retValue = wxDragMove;
+    }
+
+#if wxUSE_THREADS
+    /* re-enable GUI threads */
+    wxapp_install_thread_wakeup();
+#endif
+
+    g_blockEventsOnDrag = FALSE;
+
+    UnregisterWindow();
+
+    return m_retValue;
+}
+
+void wxDropSource::RegisterWindow()
 {
 {
-  if (!m_widget) return;
-  
-  gtk_widget_dnd_drag_set( m_widget, FALSE, NULL, 0 );
-  
-  gtk_signal_disconnect_by_data( GTK_OBJECT(m_widget), (gpointer)m_data );
-};
+    if (!m_widget) return;
+
+    gtk_signal_connect( GTK_OBJECT(m_widget), "drag_data_get",
+                      GTK_SIGNAL_FUNC (source_drag_data_get), (gpointer) this);
+    gtk_signal_connect (GTK_OBJECT(m_widget), "drag_data_delete",
+                      GTK_SIGNAL_FUNC (source_drag_data_delete),  (gpointer) this );
+    gtk_signal_connect (GTK_OBJECT(m_widget), "drag_begin",
+                      GTK_SIGNAL_FUNC (source_drag_begin),  (gpointer) this );
+    gtk_signal_connect (GTK_OBJECT(m_widget), "drag_end",
+                      GTK_SIGNAL_FUNC (source_drag_end),  (gpointer) this );
+
+}
+
+void wxDropSource::UnregisterWindow()
+{
+    if (!m_widget) return;
+
+    gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
+                      GTK_SIGNAL_FUNC(source_drag_data_get), (gpointer) this );
+    gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
+                      GTK_SIGNAL_FUNC(source_drag_data_delete), (gpointer) this );
+    gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
+                      GTK_SIGNAL_FUNC(source_drag_begin), (gpointer) this );
+    gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
+                      GTK_SIGNAL_FUNC(source_drag_end), (gpointer) this );
+}
+
+#endif
+      // wxUSE_DRAG_AND_DROP
wxWidgets (Impactor)