public static UnityAction <int> AddOnValueChangedAction(this Dropdown self, Func <int, bool> onValueChanged)
{
if (onValueChanged != null)
{
var oldSelection = self.value;
UnityAction <int> newListener = (newSection) => {
if (newSection == oldSelection)
{
return;
}
// Ignore event event if it was triggered through code, only fire for actual user input:
if (!self.ChangeInChildWasTriggeredByUserThroughEventSystem())
{
return;
}
if (!onValueChanged(newSection))
{
self.value = oldSelection;
}
else
{
oldSelection = newSection;
EventBus.instance.Publish(EventConsts.catUi + UiEvents.DROPDOWN_CHANGED, self, newSection);
}
};
self.onValueChanged.AddListener(newListener);
return(newListener);
}
return(null);
}
