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#ifndef nsLoadListenerProxy_h
#define nsLoadListenerProxy_h

#include "nsIDOMLoadListener.h"
#include "nsWeakReference.h"

/////////////////////////////////////////////
//
// This class exists to prevent a circular reference between
// the loaded document and the actual loader instance request. The
// request owns the document. While the document is loading, 
// the request is a load listener, held onto by the document.
// The proxy class breaks the circularity by filling in as the
// load listener and holding a weak reference to the request
// object.
//
/////////////////////////////////////////////

class nsLoadListenerProxy : public nsIDOMLoadListener {
public:
  nsLoadListenerProxy(nsWeakPtr aParent);
  virtual ~nsLoadListenerProxy();

  NS_DECL_ISUPPORTS

  // nsIDOMEventListener
  NS_IMETHOD HandleEvent(nsIDOMEvent* aEvent);

  // nsIDOMLoadListener
  NS_IMETHOD Load(nsIDOMEvent* aEvent);
  NS_IMETHOD Unload(nsIDOMEvent* aEvent);
  NS_IMETHOD Abort(nsIDOMEvent* aEvent);
  NS_IMETHOD Error(nsIDOMEvent* aEvent);

protected:
  nsWeakPtr  mParent;
};

#endif
