static gint
gtk_dnd_window_configure_callback( GtkWidget *WXUNUSED(widget), GdkEventConfigure *WXUNUSED(event), wxDropSource *source )
{
source->GiveFeedback( ConvertFromGTK(source->m_dragContext->action) );
return 0;
}
wxDragResult wxDropTarget::GTKFigureOutSuggestedAction()
{
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;
}
static gint
gtk_dnd_window_configure_callback( GtkWidget *WXUNUSED(widget), GdkEventConfigure *WXUNUSED(event), wxDropSource *source )
{
// don't need to install idle handler, its done from "event" signal
source->GiveFeedback( ConvertFromGTK(source->m_dragContext->action) );
return 0;
}
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( selection_data->target );
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( context->action );
gtk_selection_data_set( selection_data,
selection_data->target,
8, // 8-bit
d,
size );
delete[] d;
}
static gint
gtk_dnd_window_configure_callback( GtkWidget *WXUNUSED(widget), GdkEventConfigure *WXUNUSED(event), wxDropSource *source )
{
if (g_isIdle)
wxapp_install_idle_handler();
source->GiveFeedback( ConvertFromGTK(source->m_dragContext->action) );
return 0;
}
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 )
{
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;
}
#ifdef __WXDEBUG__
wxLogTrace(TRACE_DND, wxT( "Drop target: data received event") );
#endif
/* inform the wxDropTarget about the current GtkSelectionData.
this is only valid for the duration of this call */
drop_target->SetDragData( data );
wxDragResult result = ConvertFromGTK(context->action);
if ( wxIsDragResultOk( drop_target->OnData( x, y, result ) ) )
{
#ifdef __WXDEBUG__
wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned true") );
#endif
/* tell GTK that data transfer was successful */
gtk_drag_finish( context, TRUE, FALSE, time );
}
else
{
#ifdef __WXDEBUG__
wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned FALSE") );
#endif
/* 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->SetDragData( (GtkSelectionData*) NULL );
}
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 )
{
/* 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 );
}
wxDragResult wxDropSource::DoDragDrop(int flags)
{
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;
// we can only start a drag after a mouse event
if (g_lastMouseEvent == NULL)
return 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 );
size_t count = m_data->GetFormatCount();
for (size_t i = 0; i < count; i++)
{
GdkAtom atom = array[i];
#ifdef __WXDEBUG__
wxLogTrace(TRACE_DND, wxT("Drop source: Supported atom %s"), gdk_atom_name( atom ));
#endif
gtk_target_list_add( target_list, atom, 0, 0 );
}
delete[] array;
int action = GDK_ACTION_COPY;
if ( flags & wxDrag_AllowMove )
action |= 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;
GdkDragContext *context = gtk_drag_begin( m_widget,
target_list,
(GdkDragAction)action,
g_lastButtonNumber, // number of mouse button which started drag
(GdkEvent*) g_lastMouseEvent );
m_dragContext = context;
PrepareIcon( action, context );
while (m_waiting)
gtk_main_iteration();
m_retValue = ConvertFromGTK(context->action);
if ( m_retValue == wxDragNone )
m_retValue = wxDragCancel;
g_blockEventsOnDrag = false;
UnregisterWindow();
return m_retValue;
}
static gboolean target_drag_motion( GtkWidget *WXUNUSED(widget),
GdkDragContext *context,
gint x,
gint y,
guint time,
wxDropTarget *drop_target )
{
if (g_isIdle) wxapp_install_idle_handler();
/* 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 );
// 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 result;
if (drop_target->GetDefaultAction() == wxDragNone)
{
// use default action set by wxDropSource::DoDragDrop()
if ( (gs_flagsForDrag & wxDrag_DefaultMove) == wxDrag_DefaultMove &&
(context->actions & GDK_ACTION_MOVE ) )
{
// move is requested by the program and allowed by GTK+ - do it, even
// though suggested_action may be currently wxDragCopy
result = wxDragMove;
}
else // use whatever GTK+ says we should
{
result = ConvertFromGTK(context->suggested_action);
if ( (result == wxDragMove) && !(gs_flagsForDrag & wxDrag_AllowMove) )
{
// we're requested to move but we can't
result = wxDragCopy;
}
}
}
else if (drop_target->GetDefaultAction() == wxDragMove &&
(context->actions & GDK_ACTION_MOVE))
{
result = wxDragMove;
}
else
{
if (context->actions & GDK_ACTION_COPY)
result = wxDragCopy;
else if (context->actions & GDK_ACTION_MOVE)
result = wxDragMove;
else
result = wxDragNone;
}
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 if (result == wxDragLink)
action = GDK_ACTION_LINK;
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;
}
