content/events/public/nsPLDOMEvent.h
author Michael Wu <mwu@mozilla.com>
Wed, 28 Sep 2011 23:19:26 -0700
changeset 79445 e7854b4d29ba905ae3994f821b160c989bac4260
parent 69573 e9ded5c5e0b7f0769245617dedb1971293ebba80
child 80486 ec7577dec4fceef0ac2717416d9c48289402d935
child 112094 cad26d2fb5af799dfe030fd2a8948d617eac2f52
permissions -rw-r--r--
Bug 675553 - Switch from PRBool to bool on a CLOSED TREE , r=bsmedberg,khuey,bz,cjones

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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 * Aaron Leventhal (aaronleventhal@moonset.net)
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 * the Initial Developer. All Rights Reserved.
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 *
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#ifndef nsPLDOMEvent_h___
#define nsPLDOMEvent_h___

#include "nsCOMPtr.h"
#include "nsThreadUtils.h"
#include "nsINode.h"
#include "nsIDOMEvent.h"
#include "nsString.h"
#include "nsIDocument.h"

/**
 * Use nsPLDOMEvent to fire a DOM event that requires safe a stable DOM.
 * For example, you may need to fire an event from within layout, but
 * want to ensure that the event handler doesn't mutate the DOM at
 * the wrong time, in order to avoid resulting instability.
 *
 * TODO: This should be renamed nsAsyncDOMEvent or something that does
 *       not include the substring "PL" that refers to the old PLEvent
 *       structure used with the old eventing system.  See bug 334573.
 */
 
class nsPLDOMEvent : public nsRunnable {
public:
  nsPLDOMEvent(nsINode *aEventNode, const nsAString& aEventType,
               bool aBubbles, bool aDispatchChromeOnly)
    : mEventNode(aEventNode), mEventType(aEventType),
      mBubbles(aBubbles),
      mDispatchChromeOnly(aDispatchChromeOnly)
  { }

  nsPLDOMEvent(nsINode *aEventNode, nsIDOMEvent *aEvent)
    : mEventNode(aEventNode), mEvent(aEvent), mDispatchChromeOnly(PR_FALSE)
  { }

  nsPLDOMEvent(nsINode *aEventNode, nsEvent &aEvent);

  NS_IMETHOD Run();
  nsresult PostDOMEvent();
  void RunDOMEventWhenSafe();

  nsCOMPtr<nsINode>     mEventNode;
  nsCOMPtr<nsIDOMEvent> mEvent;
  nsString              mEventType;
  bool                  mBubbles;
  bool                  mDispatchChromeOnly;
};

class nsLoadBlockingPLDOMEvent : public nsPLDOMEvent {
public:
  nsLoadBlockingPLDOMEvent(nsINode *aEventNode, const nsAString& aEventType,
                           bool aBubbles, bool aDispatchChromeOnly)
    : nsPLDOMEvent(aEventNode, aEventType, aBubbles, aDispatchChromeOnly),
      mBlockedDoc(aEventNode->GetOwnerDoc())
  {
    if (mBlockedDoc) {
      mBlockedDoc->BlockOnload();
    }
  }

  nsLoadBlockingPLDOMEvent(nsINode *aEventNode, nsIDOMEvent *aEvent)
    : nsPLDOMEvent(aEventNode, aEvent),
      mBlockedDoc(aEventNode->GetOwnerDoc())
  {
    if (mBlockedDoc) {
      mBlockedDoc->BlockOnload();
    }
  }
  
  ~nsLoadBlockingPLDOMEvent();

  nsCOMPtr<nsIDocument> mBlockedDoc;
};

#endif