public bool RaiseEvent(RoutedEventArgs e)
{
if (e.Stage == null)
{
e.Stage = Stage;
}
if (e.OriginalSource == null)
{
e.OriginalSource = this;
e.Source = this;
}
if (e.RoutedEvent.RoutingStrategy == RoutingStrategy.Direct)
{
EventManager.InvokeClassHandlers(this, e);
if (!e.Stopped)
{
InvokeHandler(e);
}
return(e.Cancelled);
}
// Collect ancestors so event propagation is unaffected by hierarchy changes.
List <Group> ancestors = Pools <List <Group> > .Obtain();
Group parent = Parent;
while (parent != null)
{
ancestors.Add(parent);
parent = parent.Parent;
}
try {
if (e.RoutedEvent.RoutingStrategy == RoutingStrategy.Tunnel)
{
// Notify all parent capture listeners, starting at the root. Ancestors may stop an event before children receive it.
for (int i = ancestors.Count - 1; i >= 0; i--)
{
Group currentTarget = ancestors[i];
EventManager.InvokeClassHandlers(currentTarget, e);
if (!e.Stopped)
{
currentTarget.InvokeHandler(e);
}
if (e.Stopped)
{
return(e.Cancelled);
}
}
EventManager.InvokeClassHandlers(this, e);
if (!e.Stopped)
{
InvokeHandler(e);
}
if (e.Stopped)
{
return(e.Cancelled);
}
}
else if (e.RoutedEvent.RoutingStrategy == RoutingStrategy.Bubble)
{
EventManager.InvokeClassHandlers(this, e);
if (!e.Stopped)
{
InvokeHandler(e);
}
if (e.Stopped)
{
return(e.Cancelled);
}
// Notify all parent listeners, starting at the target. Children may stop an event before ancestors receive it.
foreach (Group ancestor in ancestors)
{
EventManager.InvokeClassHandlers(ancestor, e);
if (!e.Stopped)
{
ancestor.InvokeHandler(e);
}
if (e.Stopped)
{
return(e.Cancelled);
}
}
}
return(e.Cancelled);
}
finally {
ancestors.Clear();
Pools <List <Group> > .Release(ancestors);
}
}
