@Override
public boolean drop(final List<?> list, final Display<?> display) {
if (dragAndDropService == null) return false;
check(list, display);
if (list == null) return true; // trivial case
// dropping an empty list trivially succeeds
if (list.size() == 0) return true;
// use the drag-and-drop service to handle each item separately
boolean success = false;
for (final Object item : list) {
if (dragAndDropService.supports(item, display)) {
final boolean result = dragAndDropService.drop(item, display);
if (result) success = true;
}
}
return success;
}
@Override
public boolean supports(final List<?> list, final Display<?> display) {
if (dragAndDropService == null) return false;
if (!super.supports(list, display)) return false;
// empty lists are trivially compatible
if (list.size() == 0) return true;
// the list is deemed compatible if at least one item is compatible
for (final Object item : list) {
if (dragAndDropService.supports(item, display)) return true;
}
return false;
}
