/* Call virtual function "set_selection" */
gboolean xfdashboard_focusable_set_selection(XfdashboardFocusable *self, ClutterActor *inSelection)
{
XfdashboardFocusableInterface *iface;
ClutterActor *oldSelection;
gboolean success;
g_return_val_if_fail(XFDASHBOARD_IS_FOCUSABLE(self), FALSE);
g_return_val_if_fail(!inSelection || CLUTTER_IS_ACTOR(inSelection), FALSE);
iface=XFDASHBOARD_FOCUSABLE_GET_IFACE(self);
/* If this focusable actor does not support selection we should ask for
* the current selection and avoid the warning being printed if this
* virtual function was not overridden.
*/
if(!xfdashboard_focusable_supports_selection(self)) return(FALSE);
/* First get current selection */
oldSelection=xfdashboard_focusable_get_selection(self);
/* Do nothing if new selection is the same as the current one */
if(inSelection==oldSelection) return(TRUE);
/* Call virtual function */
if(iface->set_selection)
{
/* Call virtual function to set selection */
success=iface->set_selection(self, inSelection);
/* If new selection could be set successfully, remove signal handlers
* from old selection and set up signal handlers for new selection.
*/
if(success)
{
/* Remove signal handlers and styles from old selection */
if(oldSelection)
{
/* Remove signal handlers at old selection*/
g_signal_handlers_disconnect_by_func(oldSelection,
G_CALLBACK(_xfdashboard_focusable_on_selection_unavailable),
self);
/* Remove style from old selection */
if(XFDASHBOARD_IS_STYLABLE(oldSelection))
{
xfdashboard_stylable_remove_pseudo_class(XFDASHBOARD_STYLABLE(oldSelection), "selected");
}
}
/* Set up signal handlers and styles at new selection */
if(inSelection)
{
/* Set up signal handlers to get notified if new selection
* is going to be unavailable (e.g. hidden or destroyed)
*/
g_signal_connect_swapped(inSelection,
"destroy",
G_CALLBACK(_xfdashboard_focusable_on_selection_unavailable),
self);
g_signal_connect_swapped(inSelection,
"hide",
G_CALLBACK(_xfdashboard_focusable_on_selection_unavailable),
self);
/* Style new selection if this focusable actor has the focus */
if(_xfdashboard_focusable_has_focus(self) &&
XFDASHBOARD_IS_STYLABLE(inSelection))
{
xfdashboard_stylable_add_pseudo_class(XFDASHBOARD_STYLABLE(inSelection), "selected");
}
}
/* Emit signal */
g_signal_emit(self, XfdashboardFocusableSignals[SIGNAL_SELECTION_CHANGED], 0, oldSelection, inSelection);
}
/* Return result of calling virtual function */
return(success);
}
/* If we get here the virtual function was not overridden */
XFDASHBOARD_FOCUSABLE_WARN_NOT_IMPLEMENTED(self, "set_selection");
return(FALSE);
}
/* The current selection of a focusable actor (if focussed or not) is not available anymore
* (e.g. hidden or destroyed). So move selection at focusable actor to next available and
* selectable item.
*/
static void _xfdashboard_focusable_on_selection_unavailable(XfdashboardFocusable *self,
gpointer inUserData)
{
XfdashboardFocusableInterface *iface;
ClutterActor *oldSelection;
ClutterActor *newSelection;
gboolean success;
XfdashboardApplication *application;
g_return_if_fail(XFDASHBOARD_IS_FOCUSABLE(self));
g_return_if_fail(CLUTTER_IS_ACTOR(inUserData));
iface=XFDASHBOARD_FOCUSABLE_GET_IFACE(self);
oldSelection=CLUTTER_ACTOR(inUserData);
newSelection=NULL;
success=FALSE;
/* If application is not quitting then call virtual function to set selection
* which have to be available because this signal handler was set in
* xfdashboard_focusable_set_selection() when this virtual function was available
* and successfully called.
* If setting new selection was unsuccessful we set selection to nothing (NULL);
*/
application=xfdashboard_application_get_default();
if(!xfdashboard_application_is_quitting(application))
{
/* Get next selection */
newSelection=xfdashboard_focusable_find_selection(self, oldSelection, XFDASHBOARD_SELECTION_TARGET_NEXT);
/* Set new selection */
success=iface->set_selection(self, newSelection);
if(!success)
{
success=iface->set_selection(self, newSelection);
if(!success)
{
g_critical(_("Old selection %s at %s is unavailable but setting new selection either to %s or nothing failed!"),
G_OBJECT_TYPE_NAME(oldSelection),
G_OBJECT_TYPE_NAME(self),
newSelection ? G_OBJECT_TYPE_NAME(newSelection) : "<nil>");
}
/* Now reset new selection to NULL regardless if setting selection at
* focusable actor was successful or not. A critical warning was displayed
* if is was unsuccessful because setting nothing (NULL) must succeed usually.
*/
newSelection=NULL;
}
}
/* Regardless if setting selection was successful, remove signal handlers
* and styles from old selection.
*/
if(oldSelection)
{
/* Remove signal handlers at old selection*/
g_signal_handlers_disconnect_by_func(oldSelection,
G_CALLBACK(_xfdashboard_focusable_on_selection_unavailable),
self);
/* Remove style from old selection */
if(XFDASHBOARD_IS_STYLABLE(oldSelection))
{
xfdashboard_stylable_remove_pseudo_class(XFDASHBOARD_STYLABLE(oldSelection), "selected");
}
}
/* If setting selection was successful, set up signal handlers and styles at new selection */
if(success && newSelection)
{
/* Set up signal handlers to get notified if new selection
* is going to be unavailable (e.g. hidden or destroyed)
*/
g_signal_connect_swapped(newSelection,
"destroy",
G_CALLBACK(_xfdashboard_focusable_on_selection_unavailable),
self);
g_signal_connect_swapped(newSelection,
"hide",
G_CALLBACK(_xfdashboard_focusable_on_selection_unavailable),
self);
/* Check if this focusable actor has the focus because if it has
* the have to style new selection.
*/
if(_xfdashboard_focusable_has_focus(self) &&
XFDASHBOARD_IS_STYLABLE(newSelection))
{
xfdashboard_stylable_add_pseudo_class(XFDASHBOARD_STYLABLE(newSelection), "selected");
}
}
/* Emit signal because at least old selection has changed */
g_signal_emit(self, XfdashboardFocusableSignals[SIGNAL_SELECTION_CHANGED], 0, oldSelection, newSelection);
}