static public void AddListener(EEventID eventType, Callback handler)
{
// Obtain a lock on the event table to keep this thread-safe.
lock (eventTable)
{
// Create an entry for this event type if it doesn't already exist.
if (!eventTable.ContainsKey(eventType))
{
eventTable.Add(eventType, null);
}
// Add the handler to the event.
eventTable[eventType] = (Callback)eventTable[eventType] + handler;
}
}
static public void TriggerEvent(EEventID eventType, System.Object arg)
{
Delegate d;
// Invoke the delegate only if the event type is in the dictionary.
if (eventTable.TryGetValue(eventType, out d))
{
// Take a local copy to prevent a race condition if another thread
// were to unsubscribe from this event.
Callback callback = (Callback)d;
// Invoke the delegate if it's not null.
if (callback != null)
{
callback(arg);
}
}
}
static public void RemoveListener(EEventID eventType, Callback handler)
{
// Obtain a lock on the event table to keep this thread-safe.
lock (eventTable)
{
// Only take action if this event type exists.
if (eventTable.ContainsKey(eventType))
{
// Remove the event handler from this event.
eventTable[eventType] = (Callback)eventTable[eventType] - handler;
// If there's nothing left then remove the event type from the event table.
if (eventTable[eventType] == null)
{
eventTable.Remove(eventType);
}
}
}
}
