/**/ boolean doSort(boolean ascending) {
final Comparator cmpr = ascending ? _sortAsc : _sortDsc;
if (cmpr == null) return false;
final Listbox box = getListbox();
if (box == null) return false;
// comparator might be zscript
Scopes.beforeInterpret(this);
try {
final ListModel model = box.getModel();
boolean isPagingMold = box.inPagingMold();
int activePg = isPagingMold ? box.getPaginal().getActivePage() : 0;
if (model != null) { // live data
if (model instanceof GroupsSortableModel) {
sortGroupsModel(box, (GroupsSortableModel) model, cmpr, ascending);
} else {
if (!(model instanceof Sortable))
throw new UiException(
GroupsSortableModel.class
+ " or "
+ Sortable.class
+ " must be implemented in "
+ model.getClass().getName());
sortListModel((Sortable) model, cmpr, ascending);
}
} else { // not live data
sort0(box, cmpr);
}
if (isPagingMold) box.getPaginal().setActivePage(activePg);
// Because of maintaining the number of the visible item, we cause
// the wrong active page when dynamically add/remove the item (i.e. sorting).
// Therefore, we have to reset the correct active page.
} finally {
Scopes.afterInterpret();
}
_ignoreSort = true;
// maintain
for (Iterator it = box.getListhead().getChildren().iterator(); it.hasNext(); ) {
final Listheader hd = (Listheader) it.next();
hd.setSortDirection(hd != this ? "natural" : ascending ? "ascending" : "descending");
}
_ignoreSort = false;
// sometimes the items at client side are out of date
box.invalidate();
return true;
}
