private bool ReadEventHandlersFromHandlerList(FieldAccesor eventKeyAccesor)
{
if ( !eventKeyAccesor.IsValid )
return false;
if (eventListeners == null)
{
eventListeners = new ArrayList();
}
eventKeyAccesor.Save();
object eventKey = eventKeyAccesor.Value;
if (eventKey == null)
{ // no data
return true;
}
eventHandlerList = eventDescriptor.EventHandlerList;
if (eventHandlerList != null)
{
object entry = GetHead();
if (entry != null)
{
do
{
// first read the target
if (keyAccesor == null)
{
keyAccesor = new FieldAccesor(entry, "key");
}
keyAccesor.Target = entry;
keyAccesor.Save();
if (keyAccesor.Value == eventKey)
{
if (handlerAccesor == null)
{
handlerAccesor = new FieldAccesor(entry, "handler");
}
handlerAccesor.Target = entry;
handlerAccesor.Save();
if (handlerAccesor.Value != null)
{
eventListeners.Add(new EventListenerPropertyDescriptor(eventDescriptor, handlerAccesor.Value as Delegate));
}
}
entry = GetListEntry(entry);
} while (entry != null);
}
}
return true;
}
internal void ReadListeners()
{
// for examples we use event with name "Load"
// first try to read key representing the static eventKey (EventLoad as key object static)
FieldAccesor eventKeyAccesor = new FieldAccesor(eventDescriptor.Component, "Event" + eventDescriptor.Name);
if (ReadEventHandlersFromHandlerList(eventKeyAccesor))
{ // there is a key like "Event" + event name ("eg: EventLoad") representing the key in the eventHandlerList
return;
}
if( eventDescriptor.Name.EndsWith("Changed") )
{ // try "EventBackColor" for "BackColorChanged" event
string shortName = eventDescriptor.Name.Substring(0, eventDescriptor.Name.IndexOf("Changed") );
eventKeyAccesor = new FieldAccesor(eventDescriptor.Component, "Event" + shortName);
if (ReadEventHandlersFromHandlerList(eventKeyAccesor))
{ // there is a key like "Event" + event name ("eg: EventLoad") representing the key in the eventHandlerList
return;
}
}
eventKeyAccesor = new FieldAccesor(eventDescriptor.Component, "EVENT_" + eventDescriptor.Name);
if (ReadEventHandlersFromHandlerList(eventKeyAccesor))
{ // there is a key like "Event" + event name ("eg: EventLoad") representing the key in the eventHandlerList
return;
}
// try to read the delegate on the object directly!
// try "Load"
FieldAccesor delegateDirectAccesor = new FieldAccesor(eventDescriptor.Component, eventDescriptor.Name);
if (!delegateDirectAccesor.IsValid)
{ // try "onLoadDelegate"
delegateDirectAccesor = new FieldAccesor(eventDescriptor.Component, "on" + eventDescriptor.Name + "Delegate");
}
if (!delegateDirectAccesor.IsValid)
{ // try "onLoad"
delegateDirectAccesor = new FieldAccesor(eventDescriptor.Component, "on" + eventDescriptor.Name);
}
if (delegateDirectAccesor.IsValid)
{
delegateDirectAccesor.Save();
Delegate eventHandlers = delegateDirectAccesor.Value as Delegate;
if (eventHandlers != null)
{
eventListeners = new ArrayList();
Delegate[] invocationList = eventHandlers.GetInvocationList();
foreach (Delegate del in invocationList)
{
eventListeners.Add(new EventListenerPropertyDescriptor(eventDescriptor, del));
}
}
}
else
{ // sorry - give up - don't know how to read the implementation of this event :(
}
}