new file added

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

diff --git a/src/gtk/dnd.cpp b/src/gtk/dnd.cpp
index dac170064ab127cb12195c9669a229273904839d..acb68d6af29be701de0c8b03a93daebf993c5964 100644 (file)
--- a/src/gtk/dnd.cpp
+++ b/src/gtk/dnd.cpp
@@ -1,306 +1,918 @@
 ///////////////////////////////////////////////////////////////////////////////
 ///////////////////////////////////////////////////////////////////////////////

-// Name:        dnd.cpp
+// Name:        src/gtk/dnd.cpp

 // Purpose:     wxDropTarget class
 // Author:      Robert Roebling
 // Purpose:     wxDropTarget class
 // Author:      Robert Roebling

-// Copyright:   Robert Roebling
-// Licence:     wxWindows license
+// Id:          $Id$
+// Copyright:   (c) 1998 Robert Roebling
+// Licence:     wxWindows licence

 ///////////////////////////////////////////////////////////////////////////////
 
 ///////////////////////////////////////////////////////////////////////////////
 

-#ifdef __GNUG__
-#pragma implementation "dnd.h"
-#endif
+// For compilers that support precompilation, includes "wx.h".
+#include "wx/wxprec.h"
+
+#if wxUSE_DRAG_AND_DROP

 
 #include "wx/dnd.h"
 
 #include "wx/dnd.h"

-#include "wx/window.h"
-#include "wx/app.h"
-#include "wx/gdicmn.h"
-#include <wx/intl.h>

 
 

-#include "gdk/gdkprivate.h"
+#ifndef WX_PRECOMP
+    #include "wx/intl.h"
+    #include "wx/log.h"
+    #include "wx/app.h"
+    #include "wx/utils.h"
+    #include "wx/window.h"
+    #include "wx/gdicmn.h"
+#endif

 
 

-#include <X11/Xlib.h>
+#include "wx/scopeguard.h"

 
 

-// ----------------------------------------------------------------------------
-// global
-// ----------------------------------------------------------------------------
+#include <gtk/gtk.h>
+#include "wx/gtk/private/gtk2-compat.h"
+
+//----------------------------------------------------------------------------
+// global data
+//----------------------------------------------------------------------------

 
 extern bool g_blockEventsOnDrag;
 
 
 extern bool g_blockEventsOnDrag;
 

+// the flags used for the last DoDragDrop()
+static long gs_flagsForDrag = 0;
+
+// 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)
+#define TRACE_DND "dnd"
+
+// global variables because GTK+ DnD want to have the
+// mouse event that caused it
+extern GdkEvent *g_lastMouseEvent;
+extern int       g_lastButtonNumber;
+
+//----------------------------------------------------------------------------
+// standard icons
+//----------------------------------------------------------------------------
+
+/* Copyright (c) Julian Smart */
+static const char * page_xpm[] = {
+/* columns rows colors chars-per-pixel */
+"32 32 37 1",
+"5 c #7198D9",
+", c #769CDA",
+"2 c #DCE6F6",
+"i c #FFFFFF",
+"e c #779DDB",
+": c #9AB6E4",
+"9 c #EAF0FA",
+"- c #B1C7EB",
+"$ c #6992D7",
+"y c #F7F9FD",
+"= c #BED0EE",
+"q c #F0F5FC",
+"; c #A8C0E8",
+"@ c #366BC2",
+"  c None",
+"u c #FDFEFF",
+"8 c #5987D3",
+"* c #C4D5F0",
+"7 c #7CA0DC",
+"O c #487BCE",
+"< c #6B94D7",
+"& c #CCDAF2",
+"> c #89A9DF",
+"3 c #5584D1",
+"w c #82A5DE",
+"1 c #3F74CB",
+"+ c #3A70CA",
+". c #3569BF",
+"% c #D2DFF4",
+"# c #3366BB",
+"r c #F5F8FD",
+"0 c #FAFCFE",
+"4 c #DFE8F7",
+"X c #5E8AD4",
+"o c #5282D0",
+"t c #B8CCEC",
+"6 c #E5EDF9",
+/* pixels */
+"                                ",
+"                                ",
+"                                ",
+"                                ",
+"                                ",
+"       .XXXooOO++@#             ",
+"       $%&*=-;::>,<1            ",
+"       $2%&*=-;::><:3           ",
+"       $42%&*=-;::<&:3          ",
+"       56477<<<<8<<9&:X         ",
+"       59642%&*=-;<09&:5        ",
+"       5q9642%&*=-<<<<<#        ",
+"       5qqw777<<<<<88:>+        ",
+"       erqq9642%&*=t;::+        ",
+"       eyrqq9642%&*=t;:O        ",
+"       eyywwww777<<<<t;O        ",
+"       e0yyrqq9642%&*=to        ",
+"       e00yyrqq9642%&*=o        ",
+"       eu0wwwwwww777<&*X        ",
+"       euu00yyrqq9642%&X        ",
+"       eiuu00yyrqq9642%X        ",
+"       eiiwwwwwwwwww742$        ",
+"       eiiiuu00yyrqq964$        ",
+"       eiiiiuu00yyrqq96$        ",
+"       eiiiiiuu00yyrqq95        ",
+"       eiiiiiiuu00yyrqq5        ",
+"       eeeeeeeeeeeeee55e        ",
+"                                ",
+"                                ",
+"                                ",
+"                                ",
+"                                "
+};
+
+
+// ============================================================================
+// private functions
+// ============================================================================
+

 // ----------------------------------------------------------------------------
 // ----------------------------------------------------------------------------

-// wxDropTarget
+// convert between GTK+ and wxWidgets DND constants

 // ----------------------------------------------------------------------------
 
 // ----------------------------------------------------------------------------
 

-wxDropTarget::wxDropTarget()
+static wxDragResult ConvertFromGTK(long action)

 {
 {

-}
+    switch ( action )
+    {
+        case GDK_ACTION_COPY:
+            return wxDragCopy;

 
 

-wxDropTarget::~wxDropTarget()
-{
+        case GDK_ACTION_LINK:
+            return wxDragLink;
+
+        case GDK_ACTION_MOVE:
+            return wxDragMove;
+    }
+
+    return wxDragNone;

 }
 
 }
 

-void wxDropTarget::Drop( GdkEvent *event, int x, int y )
+// ----------------------------------------------------------------------------
+// "drag_leave"
+// ----------------------------------------------------------------------------
+
+extern "C" {
+static void target_drag_leave( GtkWidget *WXUNUSED(widget),
+                               GdkDragContext *context,
+                               guint WXUNUSED(time),
+                               wxDropTarget *drop_target )

 {
 {

-  printf( "Drop data is of type %s.\n", event->dropdataavailable.data_type );
-  
-  OnDrop( x, y, (char *)event->dropdataavailable.data);
+    /* inform the wxDropTarget about the current GdkDragContext.
+       this is only valid for the duration of this call */
+    drop_target->GTKSetDragContext( context );
+
+    /* we don't need return values. this event is just for
+       information */
+    drop_target->OnLeave();
+
+    /* 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->GTKSetDragContext( NULL );

 }
 }

+}
+
+// ----------------------------------------------------------------------------
+// "drag_motion"
+// ----------------------------------------------------------------------------

 
 

-void wxDropTarget::UnregisterWidget( GtkWidget *widget )
+extern "C" {
+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, (gchar **) NULL, 0, FALSE );
+    /* Owen Taylor: "if the coordinates not in a drop zone,
+       return FALSE, otherwise call gtk_drag_status() and
+       return TRUE" */
+
+#if 0
+    wxPrintf( "motion\n" );
+    GList *tmp_list;
+    for (tmp_list = context->targets; tmp_list; tmp_list = tmp_list->next)
+    {
+        wxString atom = wxString::FromAscii( gdk_atom_name (GDK_POINTER_TO_ATOM (tmp_list->data)) );
+        wxPrintf( "Atom: %s\n", atom );
+    }
+#endif
+
+    // Inform the wxDropTarget about the current GdkDragContext.
+    // This is only valid for the duration of this call.
+    drop_target->GTKSetDragContext( context );
+
+    // Does the source actually accept the data type?
+    if (drop_target->GTKGetMatchingPair() == (GdkAtom) 0)
+    {
+        drop_target->GTKSetDragContext( NULL );
+        return FALSE;
+    }
+
+    wxDragResult suggested_action = drop_target->GTKFigureOutSuggestedAction();
+
+    wxDragResult result = wxDragNone;
+
+    if (drop_target->m_firstMotion)
+    {
+        // the first "drag_motion" event substitutes a "drag_enter" event
+        result = drop_target->OnEnter( x, y, suggested_action );
+    }
+    else
+    {
+        // give program a chance to react (i.e. to say no by returning FALSE)
+        result = drop_target->OnDragOver( x, y, suggested_action );
+    }
+
+    GdkDragAction result_action = GDK_ACTION_DEFAULT;
+    if (result == wxDragCopy)
+        result_action = GDK_ACTION_COPY;
+    else if (result == wxDragLink)
+        result_action = GDK_ACTION_LINK;
+    else
+        result_action = GDK_ACTION_MOVE;
+
+    // is result action actually supported
+    bool ret = (result_action != GDK_ACTION_DEFAULT) &&
+               (gdk_drag_context_get_actions(context) & result_action);
+
+    if (ret)
+        gdk_drag_status( context, result_action, time );
+
+    // after this, invalidate the drop_target's GdkDragContext
+    drop_target->GTKSetDragContext( NULL );
+
+    // this has to be done because GDK has no "drag_enter" event
+    drop_target->m_firstMotion = false;
+
+    return ret;
+}

 }
 
 }
 

-void wxDropTarget::RegisterWidget( GtkWidget *widget )
+// ----------------------------------------------------------------------------
+// "drag_drop"
+// ----------------------------------------------------------------------------
+
+extern "C" {
+static gboolean target_drag_drop( GtkWidget *widget,
+                                  GdkDragContext *context,
+                                  gint x,
+                                  gint y,
+                                  guint time,
+                                  wxDropTarget *drop_target )

 {
 {

-  wxString formats;
-  int valid = 0;
-  
-  for ( size_t i = 0; i < GetFormatCount(); i++ )
-  {
-    wxDataFormat df = GetFormat( i );
-    switch (df) 
+    /* 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()" */
+
+    /* inform the wxDropTarget about the current GdkDragContext.
+       this is only valid for the duration of this call */
+    drop_target->GTKSetDragContext( context );
+
+    // Does the source actually accept the data type?
+    if (drop_target->GTKGetMatchingPair() == (GdkAtom) 0)
+    {
+        // cancel the whole thing
+        gtk_drag_finish( context,
+                          FALSE,        // no success
+                          FALSE,        // don't delete data on dropping side
+                          time );
+
+        drop_target->GTKSetDragContext( NULL );
+
+        drop_target->m_firstMotion = true;
+
+        return FALSE;
+    }
+
+    /* inform the wxDropTarget about the current drag widget.
+       this is only valid for the duration of this call */
+    drop_target->GTKSetDragWidget( widget );
+
+    /* inform the wxDropTarget about the current drag time.
+       this is only valid for the duration of this call */
+    drop_target->GTKSetDragTime( time );
+
+    /* 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)
+    {
+        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

     {
     {

-      case wxDF_TEXT:
-       if (i > 0) formats += ";";
-        formats += "text/plain";
-       valid++;
-       break;
-      case wxDF_FILENAME:
-       if (i > 0) formats += ";";
-        formats += "file:ALL";
-       valid++;
-       break;
-      default:
-        break;
+        wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned true") );
+
+        GdkAtom format = drop_target->GTKGetMatchingPair();
+
+        // this does happen somehow, see bug 555111
+        wxCHECK_MSG( format, FALSE, wxT("no matching GdkAtom for format?") );
+
+        /* this should trigger an "drag_data_received" event */
+        gtk_drag_get_data( widget,
+                           context,
+                           format,
+                           time );

     }
     }

-  }
-  
-  char *str = WXSTRINGCAST formats;
-  
-  gtk_widget_dnd_drop_set( widget, TRUE, &str, valid, FALSE );
+
+    /* after this, invalidate the drop_target's GdkDragContext */
+    drop_target->GTKSetDragContext( NULL );
+
+    /* after this, invalidate the drop_target's drag widget */
+    drop_target->GTKSetDragWidget( 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 )
+extern "C" {
+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;
+    /* Owen Taylor: "call gtk_drag_finish() with
+       success == TRUE" */
+
+    if (gtk_selection_data_get_length(data) <= 0 || gtk_selection_data_get_format(data) != 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->GTKSetDragData( data );
+
+    wxDragResult result = ConvertFromGTK(gdk_drag_context_get_selected_action(context));
+
+    if ( wxIsDragResultOk( drop_target->OnData( x, y, result ) ) )
+    {
+        wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned true") );
+
+        /* tell GTK that data transfer was successful */
+        gtk_drag_finish( context, TRUE, FALSE, time );
+    }
+    else
+    {
+        wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned FALSE") );
+
+        /* tell GTK that data transfer was not successful */
+        gtk_drag_finish( context, FALSE, FALSE, time );
+    }
+
+    /* after this, invalidate the drop_target's drag data */
+    drop_target->GTKSetDragData( NULL );
+}

 }
 
 }
 

-bool wxTextDropTarget::OnDropText( long x, long y, const char *psz )
+//----------------------------------------------------------------------------
+// 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 = NULL;
+    m_dragWidget = NULL;
+    m_dragData = NULL;
+    m_dragTime = 0;

 }
 
 }
 

-size_t wxTextDropTarget::GetFormatCount() const
+wxDragResult wxDropTarget::OnDragOver( wxCoord WXUNUSED(x),
+                                       wxCoord WXUNUSED(y),
+                                       wxDragResult def )

 {
 {

-  return 1;
+    return def;

 }
 
 }
 

-wxDataFormat wxTextDropTarget::GetFormat(size_t WXUNUSED(n)) const
+bool wxDropTarget::OnDrop( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y) )

 {
 {

-  return wxDF_TEXT;
+    return true;

 }
 
 }
 

-// ----------------------------------------------------------------------------
-// wxFileDropTarget
-// ----------------------------------------------------------------------------
+wxDragResult wxDropTarget::OnData( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
+                                   wxDragResult def )
+{
+    return GetData() ? def : wxDragNone;
+}

 
 

-bool wxFileDropTarget::OnDropFiles( long x, long y, size_t nFiles, const char * const WXUNUSED(aszFiles)[] )
+wxDragResult wxDropTarget::GTKFigureOutSuggestedAction()

 {
 {

-  printf( "Got %d dropped files.\n", (int)nFiles );
-  printf( "At x: %d, y: %d.\n", (int)x, (int)y );
-  return TRUE;
+    if (!m_dragContext)
+        return wxDragError;
+
+    // GTK+ always supposes that we want to copy the data by default while we
+    // might want to move it, so examine not only suggested_action - which is
+    // only good if we don't have our own preferences - but also the actions
+    // field
+    wxDragResult suggested_action = wxDragNone;
+    const GdkDragAction actions = gdk_drag_context_get_actions(m_dragContext);
+    if (GetDefaultAction() == wxDragNone)
+    {
+        // use default action set by wxDropSource::DoDragDrop()
+        if ( (gs_flagsForDrag & wxDrag_DefaultMove) == wxDrag_DefaultMove &&
+            (actions & GDK_ACTION_MOVE))
+        {
+            // move is requested by the program and allowed by GTK+ - do it, even
+            // though suggested_action may be currently wxDragCopy
+            suggested_action = wxDragMove;
+        }
+        else // use whatever GTK+ says we should
+        {
+            suggested_action = ConvertFromGTK(gdk_drag_context_get_suggested_action(m_dragContext));
+
+#if 0
+            // RR: I don't understand the code below: if the drag comes from
+            //     a different app, the gs_flagsForDrag is invalid; if it
+            //     comes from the same wx app, then GTK+ hopefully won't
+            //     suggest something we didn't allow in the frist place
+            //     in DoDrop()
+            if ( (suggested_action == wxDragMove) && !(gs_flagsForDrag & wxDrag_AllowMove) )
+            {
+                // we're requested to move but we can't
+                suggested_action = wxDragCopy;
+            }
+#endif
+        }
+    }
+    else if (GetDefaultAction() == wxDragMove &&
+            (actions & GDK_ACTION_MOVE))
+    {
+
+        suggested_action = wxDragMove;
+    }
+    else
+    {
+        if (actions & GDK_ACTION_COPY)
+            suggested_action = wxDragCopy;
+        else if (actions & GDK_ACTION_MOVE)
+            suggested_action = wxDragMove;
+        else if (actions & GDK_ACTION_LINK)
+            suggested_action = wxDragLink;
+        else
+            suggested_action = wxDragNone;
+    }
+
+    return suggested_action;

 }
 
 }
 

-bool wxFileDropTarget::OnDrop(long x, long y, const void *WXUNUSED(pData) )
+wxDataFormat wxDropTarget::GetMatchingPair()

 {
 {

-  char *str = "/this/is/a/path.txt";
+    return wxDataFormat( GTKGetMatchingPair() );
+}

 
 

-  return OnDropFiles(x, y, 1, &str ); 
+GdkAtom wxDropTarget::GTKGetMatchingPair(bool quiet)
+{
+    if (!m_dataObject)
+        return (GdkAtom) 0;
+
+    if (!m_dragContext)
+        return (GdkAtom) 0;
+
+    const GList* child = gdk_drag_context_list_targets(m_dragContext);
+    while (child)
+    {
+        GdkAtom formatAtom = (GdkAtom)(child->data);
+        wxDataFormat format( formatAtom );
+
+        if ( !quiet )
+        {
+            wxLogTrace(TRACE_DND, wxT("Drop target: drag has format: %s"),
+                       format.GetId().c_str());
+        }
+
+        if (m_dataObject->IsSupportedFormat( format ))
+            return formatAtom;
+
+        child = child->next;
+    }
+
+    return (GdkAtom) 0;
+}
+
+bool wxDropTarget::GetData()
+{
+    if (!m_dragData)
+        return false;
+
+    if (!m_dataObject)
+        return false;
+
+    wxDataFormat dragFormat(gtk_selection_data_get_target(m_dragData));
+
+    if (!m_dataObject->IsSupportedFormat( dragFormat ))
+        return false;
+
+    m_dataObject->SetData(dragFormat,
+        (size_t)gtk_selection_data_get_length(m_dragData),
+        (const void*)gtk_selection_data_get_data(m_dragData));
+
+    return true;

 }
 
 }
 

-size_t wxFileDropTarget::GetFormatCount() const
+void wxDropTarget::GtkUnregisterWidget( GtkWidget *widget )

 {
 {

-  return 1;
+    wxCHECK_RET( widget != NULL, wxT("unregister widget is NULL") );
+
+    gtk_drag_dest_unset( widget );
+
+    g_signal_handlers_disconnect_by_func (widget,
+                                          (gpointer) target_drag_leave, this);
+    g_signal_handlers_disconnect_by_func (widget,
+                                          (gpointer) target_drag_motion, this);
+    g_signal_handlers_disconnect_by_func (widget,
+                                          (gpointer) target_drag_drop, this);
+    g_signal_handlers_disconnect_by_func (widget,
+                                          (gpointer) target_drag_data_received, this);

 }
 
 }
 

-wxDataFormat wxFileDropTarget::GetFormat(size_t WXUNUSED(n)) const
+void wxDropTarget::GtkRegisterWidget( 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 */
+                       NULL,      /* we don't supply any formats here */
+                       0,                           /* number of targets = 0 */
+                       (GdkDragAction) 0 );         /* we don't supply any actions here */
+
+    g_signal_connect (widget, "drag_leave",
+                      G_CALLBACK (target_drag_leave), this);
+
+    g_signal_connect (widget, "drag_motion",
+                      G_CALLBACK (target_drag_motion), this);
+
+    g_signal_connect (widget, "drag_drop",
+                      G_CALLBACK (target_drag_drop), this);
+
+    g_signal_connect (widget, "drag_data_received",
+                      G_CALLBACK (target_drag_data_received), this);

 }
 
 }
 

-//-------------------------------------------------------------------------
-// wxDropSource
-//-------------------------------------------------------------------------
+//----------------------------------------------------------------------------
+// "drag_data_get"
+//----------------------------------------------------------------------------
+
+extern "C" {
+static void
+source_drag_data_get  (GtkWidget          *WXUNUSED(widget),
+                       GdkDragContext     *context,
+                       GtkSelectionData   *selection_data,
+                       guint               WXUNUSED(info),
+                       guint               WXUNUSED(time),
+                       wxDropSource       *drop_source )
+{
+    wxDataFormat format(gtk_selection_data_get_target(selection_data));

 
 

-//-----------------------------------------------------------------------------
-// drag request
+    wxLogTrace(TRACE_DND, wxT("Drop source: format requested: %s"),
+               format.GetId().c_str());
+
+    drop_source->m_retValue = wxDragError;
+
+    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;
+    }
+
+    drop_source->m_retValue = ConvertFromGTK(gdk_drag_context_get_selected_action(context));
+
+    gtk_selection_data_set( selection_data,
+                            gtk_selection_data_get_target(selection_data),
+                            8,   // 8-bit
+                            d,
+                            size );
+
+    delete[] d;
+}
+}

 
 

-void gtk_drag_callback( GtkWidget *widget, GdkEvent *event, wxDropSource *source )
+//----------------------------------------------------------------------------
+// "drag_end"
+//----------------------------------------------------------------------------
+
+extern "C" {
+static void source_drag_end( GtkWidget          *WXUNUSED(widget),
+                             GdkDragContext     *WXUNUSED(context),
+                             wxDropSource       *drop_source )

 {
 {

-  printf( "Data requested for dropping.\n" );
-  
-  wxDataObject *data = source->m_data;
-  
-  size_t size = data->GetDataSize();
-  char *ptr = new char[size];
-  data->GetDataHere( ptr );
-  
-  gtk_widget_dnd_data_set( widget, event, ptr, size );
-  
-  delete ptr;
-  
-  source->m_retValue = wxDropSource::Copy;
-}
-
-wxDropSource::wxDropSource( wxWindow *win )
+    drop_source->m_waiting = false;
+}
+}
+
+//-----------------------------------------------------------------------------
+// "configure_event" from m_iconWindow
+//-----------------------------------------------------------------------------
+
+extern "C" {
+static gint
+gtk_dnd_window_configure_callback( GtkWidget *WXUNUSED(widget), GdkEventConfigure *WXUNUSED(event), wxDropSource *source )

 {
 {

-  g_blockEventsOnDrag = TRUE;
-  
-  m_window = win;
-  m_widget = win->m_widget;
-  if (win->m_wxwindow) m_widget = win->m_wxwindow;
-  
-  m_data = (wxDataObject *) NULL;
-  m_retValue = Cancel;
+    source->GiveFeedback(ConvertFromGTK(gdk_drag_context_get_selected_action(source->m_dragContext)));

 
 

-  m_defaultCursor = wxCursor( wxCURSOR_NO_ENTRY );
-  m_goaheadCursor = wxCursor( wxCURSOR_HAND );
+    return 0;
+}

 }
 
 }
 

-wxDropSource::wxDropSource( wxDataObject &data, wxWindow *win )
+//---------------------------------------------------------------------------
+// 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_retValue = Cancel;
-  
-  m_data = &data;
+    m_waiting = true;
+
+    m_iconWindow = NULL;

 
 

-  m_defaultCursor = wxCursor( wxCURSOR_NO_ENTRY );
-  m_goaheadCursor = wxCursor( wxCURSOR_HAND );
+    m_window = win;
+    m_widget = win->m_widget;
+    if (win->m_wxwindow) m_widget = win->m_wxwindow;
+
+    m_retValue = wxDragNone;
+
+    SetIcons(iconCopy, iconMove, iconNone);

 }
 
 }
 

-void wxDropSource::SetData( wxDataObject &data )
+wxDropSource::wxDropSource(wxDataObject& data,
+                           wxWindow *win,
+                           const wxIcon &iconCopy,
+                           const wxIcon &iconMove,
+                           const wxIcon &iconNone)

 {
 {

-  m_data = &data;  
+    m_waiting = true;
+
+    SetData( data );
+
+    m_iconWindow = NULL;
+
+    m_window = win;
+    m_widget = win->m_widget;
+    if (win->m_wxwindow) m_widget = win->m_wxwindow;
+
+    m_retValue = wxDragNone;
+
+    SetIcons(iconCopy, iconMove, iconNone);

 }
 
 }
 

-wxDropSource::~wxDropSource(void)
+void wxDropSource::SetIcons(const wxIcon &iconCopy,
+                            const wxIcon &iconMove,
+                            const wxIcon &iconNone)

 {
 {

-//  if (m_data) delete m_data;
+    m_iconCopy = iconCopy;
+    m_iconMove = iconMove;
+    m_iconNone = iconNone;
+
+    if ( !m_iconCopy.IsOk() )
+        m_iconCopy = wxIcon(page_xpm);
+    if ( !m_iconMove.IsOk() )
+        m_iconMove = m_iconCopy;
+    if ( !m_iconNone.IsOk() )
+        m_iconNone = m_iconCopy;
+}

 
 

-  g_blockEventsOnDrag = FALSE;
+wxDropSource::~wxDropSource()
+{

 }
 }

-   
-wxDropSource::DragResult wxDropSource::DoDragDrop( bool WXUNUSED(bAllowMove) )
+
+void wxDropSource::PrepareIcon( int action, GdkDragContext *context )

 {
 {

-  if (gdk_dnd.dnd_grabbed) return (wxDropSource::DragResult) None;
-  if (gdk_dnd.drag_really) return (wxDropSource::DragResult) None;
-  
-  wxASSERT_MSG( m_data, "wxDragSource: no data" );
-  
-  if (!m_data) return (wxDropSource::DragResult) None;
-  if (m_data->GetDataSize() == 0) return (wxDropSource::DragResult) 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 = (GdkWindow **) 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, (GdkModifierType *) NULL );
-  
-  gdk_dnd_display_drag_cursor( x, y, FALSE, TRUE );
-  
-  while (gdk_dnd.drag_really || gdk_dnd.drag_perhaps) wxYield();
-  
-  UnregisterWindow();
-  
-  g_blockEventsOnDrag = FALSE;
-  
-  return m_retValue;
-}
-
-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;
+
+#ifndef __WXGTK3__
+    GdkBitmap *mask;
+    if ( icon->GetMask() )
+        mask = icon->GetMask()->GetBitmap();
+    else
+        mask = NULL;
+
+    GdkPixmap *pixmap = icon->GetPixmap();
+
+    GdkColormap *colormap = gtk_widget_get_colormap( m_widget );
+    gtk_widget_push_colormap (colormap);
+#endif
+
+    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 (m_iconWindow, TRUE);
+
+#ifdef __WXGTK3__
+    gtk_widget_set_visual(m_iconWindow, gtk_widget_get_visual(m_widget));
+#else
+    gtk_widget_pop_colormap ();
+#endif
+
+    gtk_widget_set_size_request (m_iconWindow, icon->GetWidth(), icon->GetHeight());
+    gtk_widget_realize (m_iconWindow);
+
+    g_signal_connect (m_iconWindow, "configure_event",
+                      G_CALLBACK (gtk_dnd_window_configure_callback), this);
+
+#ifdef __WXGTK3__
+    cairo_t* cr = gdk_cairo_create(gtk_widget_get_window(m_iconWindow));
+    icon->SetSourceSurface(cr, 0, 0);
+    cairo_pattern_t* pattern = cairo_get_source(cr);
+    gdk_window_set_background_pattern(gtk_widget_get_window(m_iconWindow), pattern);
+    cairo_destroy(cr);
+    cairo_surface_t* mask = icon->GetMask()->GetBitmap();
+    if (mask)
+    {
+        cairo_region_t* region = gdk_cairo_region_create_from_surface(mask);
+        gtk_widget_shape_combine_region(m_iconWindow, region);
+        cairo_region_destroy(region);
+    }
+#else
+    gdk_window_set_back_pixmap(gtk_widget_get_window(m_iconWindow), pixmap, false);
+
+    if (mask)
+        gtk_widget_shape_combine_mask (m_iconWindow, mask, 0, 0);
+#endif
+
+    gtk_drag_set_icon_widget( context, m_iconWindow, 0, 0 );
+}
+
+wxDragResult wxDropSource::DoDragDrop(int flags)

 {
 {

-  if (!m_data) return;
+    wxCHECK_MSG( m_data && m_data->GetFormatCount(), wxDragNone,
+                 wxT("Drop source: no data") );
+
+    // still in drag
+    if (g_blockEventsOnDrag)
+        return wxDragNone;
+
+    // don't start dragging if no button is down
+    if (g_lastButtonNumber == 0)
+        return wxDragNone;

 
 

-  wxString formats;
-    
-  wxDataFormat df = m_data->GetPreferredFormat();
-  
-    switch (df) 
+    // we can only start a drag after a mouse event
+    if (g_lastMouseEvent == NULL)
+        return wxDragNone;
+
+    GTKConnectDragSignals();
+    wxON_BLOCK_EXIT_OBJ0(*this, wxDropSource::GTKDisconnectDragSignals);
+
+    m_waiting = true;
+
+    GtkTargetList *target_list = gtk_target_list_new( NULL, 0 );
+
+    wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
+    m_data->GetAllFormats( array );
+    size_t count = m_data->GetFormatCount();
+    for (size_t i = 0; i < count; i++)

     {
     {

-      case wxDF_TEXT: 
-        formats += "text/plain";
-       break;
-      case wxDF_FILENAME:
-        formats += "file:ALL";
-       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;
+
+    int allowed_actions = GDK_ACTION_COPY;
+    if ( flags & wxDrag_AllowMove )
+        allowed_actions |= GDK_ACTION_MOVE;
+
+    // VZ: as we already use g_blockEventsOnDrag it shouldn't be that bad
+    //     to use a global to pass the flags to the drop target but I'd
+    //     surely prefer a better way to do it
+    gs_flagsForDrag = flags;
+
+    m_retValue = wxDragCancel;
+
+    GdkDragContext *context = gtk_drag_begin( m_widget,
+                target_list,
+                (GdkDragAction)allowed_actions,
+                g_lastButtonNumber,  // number of mouse button which started drag
+                (GdkEvent*) g_lastMouseEvent );
+
+    if ( !context )
+    {
+        // this can happen e.g. if gdk_pointer_grab() failed
+        return wxDragError;
+    }
+
+    m_dragContext = context;
+
+    PrepareIcon( allowed_actions, context );
+
+    while (m_waiting)
+        gtk_main_iteration();
+
+    g_signal_handlers_disconnect_by_func (m_iconWindow,
+                                          (gpointer) gtk_dnd_window_configure_callback, this);
+
+    return m_retValue;
+}
+
+void wxDropSource::GTKConnectDragSignals()
+{
+    if (!m_widget)
+        return;
+
+    g_blockEventsOnDrag = true;
+
+    g_signal_connect (m_widget, "drag_data_get",
+                      G_CALLBACK (source_drag_data_get), this);
+    g_signal_connect (m_widget, "drag_end",
+                      G_CALLBACK (source_drag_end), this);

 
 

-  gtk_signal_connect( GTK_OBJECT(m_widget), "drag_request_event",
-    GTK_SIGNAL_FUNC(gtk_drag_callback), (gpointer)this );

 }
 
 }
 

-void wxDropSource::UnregisterWindow(void)
+void wxDropSource::GTKDisconnectDragSignals()

 {
 {

-  if (!m_widget) return;
-  
-  gtk_widget_dnd_drag_set( m_widget, FALSE, (gchar **) NULL, 0 );
-  
-  gtk_signal_disconnect_by_data( GTK_OBJECT(m_widget), (gpointer)this );
+    if (!m_widget)
+        return;
+
+    g_blockEventsOnDrag = false;
+
+    g_signal_handlers_disconnect_by_func (m_widget,
+                                          (gpointer) source_drag_data_get,
+                                          this);
+    g_signal_handlers_disconnect_by_func (m_widget,
+                                          (gpointer) source_drag_end,
+                                          this);

 }
 }

+
+#endif
+      // wxUSE_DRAG_AND_DROP