dom_nodeimpl.cpp

khtml在gtk上的移植版本

    return count;
}

void NodeImpl::addEventListener(int id, EventListener *listener, const bool useCapture)
{
    switch (id) {
	case EventImpl::DOMSUBTREEMODIFIED_EVENT:
	    getDocument()->addListenerType(DocumentImpl::DOMSUBTREEMODIFIED_LISTENER);
	    break;
	case EventImpl::DOMNODEINSERTED_EVENT:
	    getDocument()->addListenerType(DocumentImpl::DOMNODEINSERTED_LISTENER);
	    break;
	case EventImpl::DOMNODEREMOVED_EVENT:
	    getDocument()->addListenerType(DocumentImpl::DOMNODEREMOVED_LISTENER);
	    break;
        case EventImpl::DOMNODEREMOVEDFROMDOCUMENT_EVENT:
	    getDocument()->addListenerType(DocumentImpl::DOMNODEREMOVEDFROMDOCUMENT_LISTENER);
	    break;
        case EventImpl::DOMNODEINSERTEDINTODOCUMENT_EVENT:
	    getDocument()->addListenerType(DocumentImpl::DOMNODEINSERTEDINTODOCUMENT_LISTENER);
	    break;
        case EventImpl::DOMATTRMODIFIED_EVENT:
	    getDocument()->addListenerType(DocumentImpl::DOMATTRMODIFIED_LISTENER);
	    break;
        case EventImpl::DOMCHARACTERDATAMODIFIED_EVENT:
	    getDocument()->addListenerType(DocumentImpl::DOMCHARACTERDATAMODIFIED_LISTENER);
	    break;
	default:
	    break;
    }

    RegisteredEventListener *rl = new RegisteredEventListener(static_cast<EventImpl::EventId>(id),listener,useCapture);
    if (!m_regdListeners) {
        m_regdListeners = new QPtrList<RegisteredEventListener>;
	m_regdListeners->setAutoDelete(true);
    }

    listener->ref();

    // remove existing identical listener set with identical arguments - the DOM2
    // spec says that "duplicate instances are discarded" in this case.
    removeEventListener(id,listener,useCapture);

    m_regdListeners->append(rl);
    listener->deref();
}

void NodeImpl::removeEventListener(int id, EventListener *listener, bool useCapture)
{
    if (!m_regdListeners) // nothing to remove
        return;

    RegisteredEventListener rl(static_cast<EventImpl::EventId>(id),listener,useCapture);

    QPtrListIterator<RegisteredEventListener> it(*m_regdListeners);
    for (; it.current(); ++it)
        if (*(it.current()) == rl) {
            m_regdListeners->removeRef(it.current());
            return;
        }
}

void NodeImpl::removeHTMLEventListener(int id)
{
    if (!m_regdListeners) // nothing to remove
        return;

    QPtrListIterator<RegisteredEventListener> it(*m_regdListeners);
    for (; it.current(); ++it)
        if (it.current()->id == id &&
            it.current()->listener->eventListenerType() == "_khtml_HTMLEventListener") {
            m_regdListeners->removeRef(it.current());
            return;
        }
}

void NodeImpl::setHTMLEventListener(int id, EventListener *listener)
{
    // in case we already have it, we don't want removeHTMLEventListener to destroy it
    if (listener)
        listener->ref();
    removeHTMLEventListener(id);
    if (listener)
    {
        addEventListener(id,listener,false);
        listener->deref();
    }
}

EventListener *NodeImpl::getHTMLEventListener(int id)
{
    if (!m_regdListeners)
        return 0;

    QPtrListIterator<RegisteredEventListener> it(*m_regdListeners);
    for (; it.current(); ++it)
        if (it.current()->id == id &&
            it.current()->listener->eventListenerType() == "_khtml_HTMLEventListener") {
            return it.current()->listener;
        }
    return 0;
}


bool NodeImpl::dispatchEvent(EventImpl *evt, int &exceptioncode, bool tempEvent)
{
    evt->setTarget(this);

    KHTMLPart *part = document->document()->part();

    // Since event handling code could cause this object to be deleted, grab a reference to the view now
    KHTMLView *view = document->document()->view();
    if (view)
        view->ref();

    bool ret = dispatchGenericEvent( evt, exceptioncode );

    // If tempEvent is true, this means that the DOM implementation will not be storing a reference to the event, i.e.
    // there is no way to retrieve it from javascript if a script does not already have a reference to it in a variable.
    // So there is no need for the interpreter to keep the event in it's cache
    if (tempEvent && part && part->jScript())
        part->jScript()->finishedWithEvent(evt);

    if (view)
        view->deref();

    return ret;
}

bool NodeImpl::dispatchGenericEvent( EventImpl *evt, int &/*exceptioncode */)
{
    // ### check that type specified

    // work out what nodes to send event to
    QPtrList<NodeImpl> nodeChain;
    NodeImpl *n;
    for (n = this; n; n = n->parentNode()) {
        n->ref();
        nodeChain.prepend(n);
    }

    // trigger any capturing event handlers on our way down
    evt->setEventPhase(Event::CAPTURING_PHASE);
    QPtrListIterator<NodeImpl> it(nodeChain);
    for (; it.current() && it.current() != this && !evt->propagationStopped(); ++it) {
        evt->setCurrentTarget(it.current());
        it.current()->handleLocalEvents(evt,true);
    }

    // dispatch to the actual target node
    it.toLast();
    if (!evt->propagationStopped()) {
        evt->setEventPhase(Event::AT_TARGET);
        evt->setCurrentTarget(it.current());

	// Capturing first. -dwh
        it.current()->handleLocalEvents(evt,true);

	// Bubbling second. -dwh
	if (!evt->propagationStopped())
	  it.current()->handleLocalEvents(evt,false);
    }
    --it;

    // ok, now bubble up again (only non-capturing event handlers will be called)
    // ### recalculate the node chain here? (e.g. if target node moved in document by previous event handlers)
    // no. the DOM specs says:
    // The chain of EventTargets from the event target to the top of the tree
    // is determined before the initial dispatch of the event.
    // If modifications occur to the tree during event processing,
    // event flow will proceed based on the initial state of the tree.
    //
    // since the initial dispatch is before the capturing phase,
    // there's no need to recalculate the node chain.
    // (tobias)

    if (evt->bubbles()) {
        evt->setEventPhase(Event::BUBBLING_PHASE);
        for (; it.current() && !evt->propagationStopped() && !evt->getCancelBubble(); --it) {
            evt->setCurrentTarget(it.current());
            it.current()->handleLocalEvents(evt,false);
        }
    }

    evt->setCurrentTarget(0);
    evt->setEventPhase(0); // I guess this is correct, the spec does not seem to say
                           // anything about the default event handler phase.


    if (evt->bubbles()) {
	// now we call all default event handlers (this is not part of DOM - it is internal to khtml)

	it.toLast();
	for (; it.current() && !evt->propagationStopped() && !evt->defaultPrevented() && !evt->defaultHandled(); --it)
	    it.current()->defaultEventHandler(evt);
    }
    
    // In the case of a mouse click, also send a DOMActivate event, which causes things like form submissions
    // to occur. Note that this only happens for _real_ mouse clicks (for which we get a KHTML_CLICK_EVENT or
    // KHTML_DBLCLICK_EVENT), not the standard DOM "click" event that could be sent from js code.
    if (!evt->defaultPrevented() && !disabled())
        if (evt->id() == EventImpl::KHTML_CLICK_EVENT)
            dispatchUIEvent(EventImpl::DOMACTIVATE_EVENT, 1);
        else if (evt->id() == EventImpl::KHTML_DBLCLICK_EVENT)
            dispatchUIEvent(EventImpl::DOMACTIVATE_EVENT, 2);

    // deref all nodes in chain
    it.toFirst();
    for (; it.current(); ++it)
        it.current()->deref(); // this may delete us

    DocumentImpl::updateDocumentsRendering();

    return !evt->defaultPrevented(); // ### what if defaultPrevented was called before dispatchEvent?
}

bool NodeImpl::dispatchHTMLEvent(int _id, bool canBubbleArg, bool cancelableArg)
{
    int exceptioncode = 0;
    EventImpl *evt = new EventImpl(static_cast<EventImpl::EventId>(_id),canBubbleArg,cancelableArg);
    evt->ref();
    bool r = dispatchEvent(evt,exceptioncode,true);
    evt->deref();
    return r;
}

bool NodeImpl::dispatchWindowEvent(int _id, bool canBubbleArg, bool cancelableArg)
{
    int exceptioncode = 0;
    EventImpl *evt = new EventImpl(static_cast<EventImpl::EventId>(_id),canBubbleArg,cancelableArg);
    evt->setTarget( 0 );
    evt->ref();
    DocumentPtr *doc = document;
    doc->ref();
    bool r = dispatchGenericEvent( evt, exceptioncode );
    if (!evt->defaultPrevented() && doc->document())
	doc->document()->defaultEventHandler(evt);
    
    if (_id == EventImpl::LOAD_EVENT && !evt->propagationStopped() && doc->document()) {
        // For onload events, send them to the enclosing frame only.
        // This is a DOM extension and is independent of bubbling/capturing rules of
        // the DOM.  You send the event only to the enclosing frame.  It does not
        // bubble through the parent document.
        DOM::ElementImpl* elt = doc->document()->ownerElement();
        if (elt && (elt->getDocument()->domain().isNull() ||
                    elt->getDocument()->domain() == doc->document()->domain())) {
            // We also do a security check, since we don't want to allow the enclosing
            // iframe to see loads of child documents in other domains.
            evt->setCurrentTarget(elt);

            // Capturing first.
            elt->handleLocalEvents(evt,true);

            // Bubbling second.
            if (!evt->propagationStopped())
                elt->handleLocalEvents(evt,false);
            r = !evt->defaultPrevented();
        }
    }

    doc->deref();
    evt->deref();

    return r;
}

bool NodeImpl::dispatchMouseEvent(QMouseEvent *_mouse, int overrideId, int overrideDetail)
{
    bool cancelable = true;
    int detail = overrideDetail; // defaults to 0
    EventImpl::EventId evtId = EventImpl::UNKNOWN_EVENT;
    if (overrideId) {
        evtId = static_cast<EventImpl::EventId>(overrideId);
    }
    else {
        switch (_mouse->type()) {
            case QEvent::MouseButtonPress:
                evtId = EventImpl::MOUSEDOWN_EVENT;
                break;
            case QEvent::MouseButtonRelease:
                evtId = EventImpl::MOUSEUP_EVENT;
                break;
            case QEvent::MouseButtonDblClick:
                evtId = EventImpl::CLICK_EVENT;
                detail = 1; // ### support for multiple double clicks
                break;
            case QEvent::MouseMove:
                evtId = EventImpl::MOUSEMOVE_EVENT;
                cancelable = false;
                break;
            default:
                break;
        }
    }
    if (evtId == EventImpl::UNKNOWN_EVENT)
        return false; // shouldn't happen


    int exceptioncode = 0;

//    int clientX, clientY;
//    viewportToContents(_mouse->x(), _mouse->y(), clientX, clientY);
    int clientX = _mouse->x(); // ### adjust to be relative to view
    int clientY = _mouse->y(); // ### adjust to be relative to view

    int screenX = _mouse->globalX();
    int screenY = _mouse->globalY();

    int button = -1;
    switch (_mouse->button()) {
        case Qt::LeftButton:
            button = 0;
            break;
        case Qt::MidButton:
            button = 1;
            break;
        case Qt::RightButton:
            button = 2;
            break;
        default:
            break;
    }
    bool ctrlKey = (_mouse->state() & Qt::ControlButton);
    bool altKey = (_mouse->state() & Qt::AltButton);
    bool shiftKey = (_mouse->state() & Qt::ShiftButton);
    bool metaKey = false; // ### qt support?

    EventImpl *evt = new MouseEventImpl(evtId,true,cancelable,getDocument()->defaultView(),
                   detail,screenX,screenY,clientX,clientY,ctrlKey,altKey,shiftKey,metaKey,
                   button,0);
    evt->ref();
    bool r = dispatchEvent(evt,exceptioncode,true);
    evt->deref();
    return r;

}

bool NodeImpl::dispatchUIEvent(int _id, int detail)
{
    assert (!( (_id != EventImpl::DOMFOCUSIN_EVENT &&
        _id != EventImpl::DOMFOCUSOUT_EVENT &&
                _id != EventImpl::DOMACTIVATE_EVENT)));

    bool cancelable = false;
    if (_id == EventImpl::DOMACTIVATE_EVENT)
        cancelable = true;

    int exceptioncode = 0;
    UIEventImpl *evt = new UIEventImpl(static_cast<EventImpl::EventId>(_id),true,
                                       cancelable,getDocument()->defaultView(),detail);
    evt->ref();
    bool r = dispatchEvent(evt,exceptioncode,true);
    evt->deref();
    return r;
}

bool NodeImpl::dispatchSubtreeModifiedEvent()
{
    childrenChanged();
    if (!getDocument()->hasListenerType(DocumentImpl::DOMSUBTREEMODIFIED_LISTENER))
	return false;
    int exceptioncode = 0;
    return dispatchEvent(new MutationEventImpl(EventImpl::DOMSUBTREEMODIFIED_EVENT,
			 true,false,0,DOMString(),DOMString(),DOMString(),0),exceptioncode,true);
}

bool NodeImpl::dispatchKeyEvent(QKeyEvent *key)
{
    int exceptioncode = 0;
    //kdDebug(6010) << "DOM::NodeImpl: dispatching keyboard event" << endl;
    KeyboardEventImpl *keyboardEventImpl = new KeyboardEventImpl(key, getDocument()->defaultView());
    keyboardEventImpl->ref();
    bool r = dispatchEvent(keyboardEventImpl,exceptioncode,true);

#if APPLE_CHANGES
    // we want to return false if default is prevented (already taken care of)
    // or if the element is default-handled by the DOM. Otherwise we let it just
    // let it get handled by AppKit 
    if (keyboardEventImpl->defaultHandled())
#else
    // the default event handler should accept() the internal QKeyEvent
    // to prevent the view from further evaluating it.
    if (!keyboardEventImpl->defaultPrevented() && !keyboardEventImpl->qKeyEvent->isAccepted())
#endif
      r = false;

    keyboardEventImpl->deref();
    return r;
}

void NodeImpl::handleLocalEvents(EventImpl *evt, bool useCapture)
{
    if (!m_regdListeners)
        return;

    if (disabled() && evt->isMouseEvent())
        return;

    QPtrList<RegisteredEventListener> listenersCopy = *m_regdListeners;
    QPtrListIterator<RegisteredEventListener> it(listenersCopy);
    Event ev = evt;
    for (; it.current(); ++it) {
        if (it.current()->id == evt->id() && it.current()->useCapture == useCapture)
            it.current()->listener->handleEvent(ev, false);
    }

}

void NodeImpl::defaultEventHandler(EventImpl *evt)
{
}

unsigned long NodeImpl::childNodeCount()
{
    return 0;
}

NodeImpl *NodeImpl::childNode(unsigned long /*index*/)
{
    return 0;
}

NodeImpl *NodeImpl::traverseNextNode(NodeImpl *stayWithin) const
{
    if (firstChild())
	return firstChild();
    if (nextSibling())
	return nextSibling();
    const NodeImpl *n = this;
    while (n && !n->nextSibling() && (!stayWithin || n->parentNode() != stayWithin))
        n = n->parentNode();
    if (n && (!stayWithin || n->parentNode() != stayWithin))
        return n->nextSibling();
    return 0;
}

NodeImpl *NodeImpl::traverseNextSibling(NodeImpl *stayWithin) const
{
    if (nextSibling())
	return nextSibling();
    const NodeImpl *n = this;
    while (n && !n->nextSibling() && (!stayWithin || n->parentNode() != stayWithin))
        n = n->parentNode();
    if (n && (!stayWithin || n->parentNode() != stayWithin))
        return n->nextSibling();
    return 0;
}

NodeImpl *NodeImpl::traversePreviousNode() const
{
    if (previousSibling()) {
        NodeImpl *n = previousSibling();
        while (n->lastChild())
            n = n->lastChild();
        return n;
    }
    else if (parentNode()) {
        return parentNode();
    }
    else {
        return 0;
    }
}