/// <summary>
/// Add or remove the provided handler
/// </summary>
/// <typeparam name="TEventArgs">The type of the handler</typeparam>
/// <param name="addHandler">true to add an event listener, false to remove one</param>
/// <param name="key">The key to the current handler</param>
/// <param name="handler">The event to add or remove</param>
/// <returns>Returns non-null if the wrapper needs to be added or removed</returns>
private Delegate AddOrRemove <TEventArgs>(TypeAndDomainObjectKey key, EventHandler <TEventArgs> handler, bool addHandler) where TEventArgs : ModelingEventArgs
{
Delegate retVal = null;
EventHandlerWrapper currentWrapper = null;
if (myDictionary.TryGetValue(key, out currentWrapper))
{
if (addHandler)
{
currentWrapper.InnerHandler = MulticastDelegate.Combine(currentWrapper.InnerHandler, handler);
}
else
{
Delegate newDelegate = MulticastDelegate.Remove(currentWrapper.InnerHandler, handler);
currentWrapper.InnerHandler = newDelegate;
if (newDelegate == null)
{
myDictionary.Remove(key);
retVal = new EventHandler <TEventArgs>(((EventHandlerWrapper <TEventArgs>)currentWrapper).Handler);
}
}
}
else
{
EventHandlerWrapper <TEventArgs> wrappedHandler = new EventHandlerWrapper <TEventArgs>(handler, this);
myDictionary.Add(key, wrappedHandler);
retVal = new EventHandler <TEventArgs>(wrappedHandler.Handler);
}
return(retVal);
}
public Button CreateButton(string text)
{
EventHandlerWrapper e = new EventHandlerWrapper();
Button btn = new Button();
btn.Text = text;
btn.Click += e.button_Click;
}
internal void HookupControlEvent(Control control, string eventName, string handlerName, int line)
{
EventInfo eventInfo = control.GetType().GetEvent(eventName);
if (eventInfo == null)
{
throw new Exception("Control '" + control.ID + "' doesn't have an event named '" +
eventName + "'");
}
object o = null;
if (_scopeDictionary == null || !_scopeDictionary.TryGetValue(handlerName, out o))
{
Misc.ThrowException("The page doesn't have an event handler named '" + handlerName + "'",
null, _templateControl.AppRelativeVirtualPath, line);
}
DynamicFunction handlerFunction = new DynamicFunction(o);
Delegate handler = EventHandlerWrapper.GetWrapper(this, handlerFunction, _scriptVirtualPath, eventInfo.EventHandlerType);
eventInfo.AddEventHandler(control, handler);
}
