/// <summary>
/// Removes the first occurance of the specified handler from the
/// invocation list of the PreprocessMessage event.
/// <summary>
public void RemoveThreadPreprocessMessageHandlerFirst(ThreadMessageEventHandler handler)
{
if (_threadPreprocessMessage != null)
{
ThreadMessageEventHandler newHandler = null;
foreach (ThreadMessageEventHandler testHandler in _threadPreprocessMessage.GetInvocationList())
{
if (testHandler == handler)
{
// This is the handler to remove. We should not check
// for any more occurances.
handler = null;
}
else
{
newHandler += testHandler;
}
}
_threadPreprocessMessage = newHandler;
}
}
internal static void CriticalRemoveThreadPreprocessMessageHandlerFirst(ThreadMessageEventHandler handler)
{
ComponentDispatcher.CurrentThreadData.RemoveThreadPreprocessMessageHandlerFirst(handler);
}
/// <summary>
/// Removes the first occurance of the specified handler from the
/// invocation list of the PreprocessMessage event.
/// <summary>
internal static void CriticalRemoveThreadPreprocessMessageHandlerFirst(ThreadMessageEventHandler handler)
{
ComponentDispatcher.CurrentThreadData.RemoveThreadPreprocessMessageHandlerFirst(handler);
}
public WeakEventPreprocessMessage(HwndSource source, bool addToFront): base(source)
{
_addToFront = addToFront;
_handler = new ThreadMessageEventHandler(this.OnPreprocessMessage);
if(addToFront)
{
ComponentDispatcher.CriticalAddThreadPreprocessMessageHandlerFirst(_handler);
}
else
{
ComponentDispatcher.ThreadPreprocessMessage += _handler;
}
}
public void RemoveThreadPreprocessMessageHandlerFirst(ThreadMessageEventHandler handler)
{
if (_threadPreprocessMessage != null)
{
ThreadMessageEventHandler newHandler = null;
foreach (ThreadMessageEventHandler testHandler in _threadPreprocessMessage.GetInvocationList())
{
if (testHandler == handler)
{
// This is the handler to remove. We should not check
// for any more occurances.
handler = null;
}
else
{
newHandler += testHandler;
}
}
_threadPreprocessMessage = newHandler;
}
}
public void AddThreadPreprocessMessageHandlerFirst(ThreadMessageEventHandler handler)
{
_threadPreprocessMessage = (ThreadMessageEventHandler)Delegate.Combine(handler, _threadPreprocessMessage);
}
/// <summary>
/// Adds the specified handler to the front of the invocation list
/// of the PreprocessMessage event.
/// <summary>
public void AddThreadPreprocessMessageHandlerFirst(ThreadMessageEventHandler handler)
{
_threadPreprocessMessage = (ThreadMessageEventHandler)Delegate.Combine(handler, _threadPreprocessMessage);
}
