private void AddHandlerToMap(Type handlerType, IEventSystemHandler handler)
{
bool isParentObjectRegistered = false;
var componentHandler = handler as Component;
if (componentHandler != null && EventListeners.Contains(componentHandler.gameObject))
{
isParentObjectRegistered = true;
WarnAboutConflictingApis(componentHandler.gameObject.name);
}
List <EventHandlerEntry> handlers;
if (!EventHandlersByType.TryGetValue(handlerType, out handlers))
{
handlers = new List <EventHandlerEntry> {
new EventHandlerEntry(handler, isParentObjectRegistered)
};
EventHandlersByType.Add(handlerType, handlers);
return;
}
bool handlerExists = false;
for (int i = handlers.Count - 1; i >= 0; i--)
{
if (handlers[i].handler == handler)
{
handlerExists = true;
break;
}
}
if (!handlerExists)
{
handlers.Add(new EventHandlerEntry(handler, isParentObjectRegistered));
}
}
/// <inheritdoc />
private void RemoveHandlerFromMap(Type handlerType, IEventSystemHandler handler)
{
List <EventHandlerEntry> handlers;
if (!EventHandlersByType.TryGetValue(handlerType, out handlers))
{
return;
}
for (int i = handlers.Count - 1; i >= 0; i--)
{
if (handlers[i].handler == handler)
{
handlers.RemoveAt(i);
}
}
if (handlers.Count == 0)
{
EventHandlersByType.Remove(handlerType);
}
}
/// <inheritdoc />
public virtual void HandleEvent <T>(BaseEventData eventData, ExecuteEvents.EventFunction <T> eventHandler) where T : IEventSystemHandler
{
Debug.Assert(!eventData.used);
eventExecutionDepth++;
// This sends the event to every component that implements the corresponding event handling interface,
// regardless of whether it was the one registering the object as global listener or not.
// This behavior is kept for backwards compatibility. Will be removed together with the IMixedRealityEventSystem.Register(GameObject listener) interface.
for (int i = EventListeners.Count - 1; i >= 0; i--)
{
ExecuteEvents.Execute(EventListeners[i], eventData, eventHandler);
}
// Send events to all handlers registered via RegisterHandler API.
List <EventHandlerEntry> handlers;
if (EventHandlersByType.TryGetValue(typeof(T), out handlers))
{
for (int i = handlers.Count - 1; i >= 0; i--)
{
var handlerEntry = handlers[i];
// If handler's parent is in object collection (traversed above), it has already received an event.
if (handlerEntry.parentObjectIsInObjectCollection)
{
continue;
}
eventHandler.Invoke((T)handlerEntry.handler, eventData);
}
}
eventExecutionDepth--;
if (eventExecutionDepth == 0 && (postponedActions.Count > 0 || postponedObjectActions.Count > 0))
{
foreach (var handler in postponedActions)
{
if (handler.Item1 == Action.Add)
{
AddHandlerToMap(handler.Item2, handler.Item3);
}
else if (handler.Item1 == Action.Remove)
{
RemoveHandlerFromMap(handler.Item2, handler.Item3);
}
}
foreach (var obj in postponedObjectActions)
{
if (obj.Item1 == Action.Add)
{
// Can call it here, because guaranteed that eventExecutionDepth is 0
Register(obj.Item2);
}
else if (obj.Item1 == Action.Remove)
{
Unregister(obj.Item2);
}
}
postponedActions.Clear();
postponedObjectActions.Clear();
}
}
/// <inheritdoc />
public virtual void HandleEvent <T>(BaseEventData eventData, ExecuteEvents.EventFunction <T> eventHandler) where T : IEventSystemHandler
{
Debug.Assert(!eventData.used);
eventExecutionDepth++;
// This sends the event to every component that implements the corresponding event handling interface,
// regardless of whether it was the one registering the object as global listener or not.
// This behavior is kept for backwards compatibility. Will be removed together with the IMixedRealityEventSystem.Register(GameObject listener) interface.
for (int i = EventListeners.Count - 1; i >= 0; i--)
{
// Ensure client code does not put the event dispatch system into a bad state.
// Note that ExecuteEvents.Execute internally safeguards against exceptions, but
// this is another layer to ensure that nothing below this layer can affect the state
// of our eventExecutionDepth tracker.
try
{
ExecuteEvents.Execute(EventListeners[i], eventData, eventHandler);
}
catch (Exception ex)
{
Debug.LogException(ex);
}
}
// Send events to all handlers registered via RegisterHandler API.
if (EventHandlersByType.TryGetValue(typeof(T), out List <EventHandlerEntry> handlers))
{
for (int i = handlers.Count - 1; i >= 0; i--)
{
var handlerEntry = handlers[i];
// If handler's parent is in object collection (traversed above), it has already received an event.
if (handlerEntry.parentObjectIsInObjectCollection)
{
continue;
}
// Ensure client code does not put the event dispatch system into a bad state.
try
{
eventHandler.Invoke((T)handlerEntry.handler, eventData);
}
catch (Exception ex)
{
Debug.LogException(ex);
}
}
}
eventExecutionDepth--;
if (eventExecutionDepth == 0)
{
int postponedActionsCount = postponedActions.Count;
int postponedObjectActionsCount = postponedObjectActions.Count;
if (postponedActionsCount <= 0 && postponedObjectActionsCount <= 0)
{
return;
}
for (int i = 0; i < postponedActionsCount; i++)
{
Tuple <Action, Type, IEventSystemHandler> handler = postponedActions[i];
if (handler.Item1 == Action.Add)
{
AddHandlerToMap(handler.Item2, handler.Item3);
}
else if (handler.Item1 == Action.Remove)
{
RemoveHandlerFromMap(handler.Item2, handler.Item3);
}
}
for (int i = 0; i < postponedObjectActionsCount; i++)
{
Tuple <Action, GameObject> obj = postponedObjectActions[i];
if (obj.Item1 == Action.Add)
{
// Can call it here, because guaranteed that eventExecutionDepth is 0
Register(obj.Item2);
}
else if (obj.Item1 == Action.Remove)
{
Unregister(obj.Item2);
}
}
postponedActions.Clear();
postponedObjectActions.Clear();
}
}
