/// <summary>Called when a player is trying to log out, to raise the player log out request.</summary>
/// <param name="player">The player.</param>
/// <param name="e">The event arguments.</param>
public static void OnPlayerLogOutRequest(Thing player, CancellableGameEvent e)
{
var eventHandler = GlobalPlayerLogOutRequest;
if (eventHandler != null)
{
eventHandler(player.Parent, e);
}
}
/// <summary>Event handler for denying the changing of the parent of a Thing which has a WorldBehavior since World should be highest.</summary>
/// <param name="sender">The sender of the event.</param>
/// <param name="e">The event arguments.</param>
private void DenyWorldParentChanges(Thing sender, CancellableGameEvent e)
{
if (e.ActiveThing == this.Parent)
{
var addChildRequest = e as AddChildEvent;
if (addChildRequest != null)
{
addChildRequest.Cancel("World cannot become a child of anything.");
}
}
}
/// <summary>Handle any movement requests.</summary>
/// <param name="root">The root Thing where this event broadcast started.</param>
/// <param name="e">The cancellable event/request arguments.</param>
private void MovementRequestHandler(Thing root, CancellableGameEvent e)
{
// Only cancel movement requests through our parent if it is currently closed.
if (!this.IsOpen)
{
var parent = this.Parent;
if (parent != null)
{
// If this is a standard movement request, find out if we need to cancel it.
var movementEvent = e as MovementEvent;
if (movementEvent != null && movementEvent.GoingVia == this.Parent)
{
// @@@ TODO: If the actor also cannot perceive our parent properly, perhaps broadcast
// a sensory event like "Dude blindly ran into a door."
string message = string.Format("You cannot move through {0} since it is closed!", this.Parent.Name);
movementEvent.Cancel(message);
}
}
}
}
/// <summary>Called when a player is trying to log out, to raise the player log out request.</summary>
/// <param name="player">The player.</param>
/// <param name="e">The event arguments.</param>
public static void OnPlayerLogOutRequest(Thing player, CancellableGameEvent e)
{
GlobalPlayerLogOutRequest?.Invoke(player.Parent, e);
}
/// <summary>Called when a player is trying to log in, to raise the player log in request.</summary>
/// <param name="player">The player.</param>
/// <param name="e">The event arguments.</param>
public void OnPlayerLogInRequest(Thing player, CancellableGameEvent e)
{
this.GlobalPlayerLogInRequest?.Invoke(player.Parent, e);
}
/// <summary>Raises the <see cref="MiscellaneousRequest"/> event.</summary>
/// <param name="e">The <see cref="WheelMUD.Core.Events.CancellableGameEvent"/> instance containing the event data.</param>
/// <param name="eventScope">The base target(s) to broadcast to, including their children.</param>
public void OnMiscellaneousRequest(CancellableGameEvent e, EventScope eventScope)
{
OnRequest(t => t.MiscellaneousRequest, e, eventScope);
}
/// <summary>Raises the <see cref="CommunicationRequest"/> event.</summary>
/// <param name="e">The <see cref="WheelMUD.Core.Events.CancellableGameEvent"/> instance containing the event data.</param>
/// <param name="eventScope">The base target(s) to broadcast to, including their children.</param>
public void OnCommunicationRequest(CancellableGameEvent e, EventScope eventScope)
{
OnRequest(t => t.CommunicationRequest, e, eventScope);
}
/// <summary>Raises the <see cref="MovementRequest"/> event.</summary>
/// <param name="e">The <see cref="WheelMUD.Core.Events.CancellableGameEvent"/> instance containing the event data.</param>
/// <param name="eventScope">The base target(s) to broadcast to, including their children.</param>
public void OnMovementRequest(CancellableGameEvent e, EventScope eventScope)
{
OnRequest(t => t.MovementRequest, e, eventScope);
}
/// <summary>Shared code for request handling.</summary>
/// <param name="handlerSelector">A function which returns the appropriate Handler for a given Thing.</param>
/// <param name="e">The game event args to pass through.</param>
/// <param name="cascadeEventToChildren">If true, the event should be cascaded to child things as well.</param>
private void OnRequest(Func <ThingEventing, CancellableGameEventHandler> handlerSelector, CancellableGameEvent e, bool cascadeEventToChildren)
{
// Build a request target queue which starts with our owner Thing and visits all it's Children.
// (This is a queue instead of recursion to help avoid stack overflows and such with very large object trees.)
Queue <Thing> requestTargetQueue = new Queue <Thing>();
requestTargetQueue.Enqueue(owner);
while (requestTargetQueue.Count > 0)
{
// If anything (like one of the thing's Behaviors) is subscribed to this request, send it there.
Thing currentRequestTarget = requestTargetQueue.Dequeue();
var handler = handlerSelector(currentRequestTarget.Eventing);
if (handler != null)
{
handler(currentRequestTarget, e);
// If the event has been cancelled by the handler, we no longer need to look for further permission.
if (e.IsCancelled)
{
break;
}
}
if (cascadeEventToChildren)
{
// Enqueue all the current target's children for processing.
foreach (Thing child in currentRequestTarget.Children)
{
requestTargetQueue.Enqueue(child);
}
}
}
}
private void OnRequest(Func <ThingEventing, CancellableGameEventHandler> handlerSelector, CancellableGameEvent e, EventScope eventScope)
{
// Determine what layer(s) we're broadcasting to; beyond the first layer, these should all be to Children.
switch (eventScope)
{
case EventScope.ParentsDown:
// Send the request to each parent, until cancellation is noticed or we've finished.
Queue <Thing> requestQueue = new Queue <Thing>(owner.Parents);
while (requestQueue.Count > 0 && !e.IsCancelled)
{
Thing currentParent = requestQueue.Dequeue();
currentParent.Eventing.OnRequest(handlerSelector, e, true);
}
break;
case EventScope.SelfDown:
OnRequest(handlerSelector, e, true);
break;
case EventScope.SelfOnly:
OnRequest(handlerSelector, e, false);
break;
default:
throw new NotImplementedException();
}
}