C++ HTMLOptionElement::disabled方法代码示例

void HTMLSelectElement::updateListBoxSelection(bool deselectOtherOptions)
{
    ASSERT(renderer() && renderer()->isListBox());
    
    unsigned start;
    unsigned end;
    ASSERT(m_activeSelectionAnchorIndex >= 0);
    start = min(m_activeSelectionAnchorIndex, m_activeSelectionEndIndex);
    end = max(m_activeSelectionAnchorIndex, m_activeSelectionEndIndex);

    const Vector<HTMLElement*>& items = listItems();
    for (unsigned i = 0; i < items.size(); i++) {
        if (items[i]->hasLocalName(optionTag)) {
            HTMLOptionElement* option = static_cast<HTMLOptionElement*>(items[i]);
            if (!option->disabled()) {
                if (i >= start && i <= end)
                    option->setSelectedState(m_activeSelectionState);
                else if (deselectOtherOptions || i >= m_cachedStateForActiveSelection.size())
                    option->setSelectedState(false);
                else
                    option->setSelectedState(m_cachedStateForActiveSelection[i]);
            }
        }
    }

    scrollToSelection();
}

JSValue jsHTMLOptionElementDisabled(ExecState* exec, JSValue slotBase, const Identifier&)
{
    JSHTMLOptionElement* castedThis = static_cast<JSHTMLOptionElement*>(asObject(slotBase));
    UNUSED_PARAM(exec);
    HTMLOptionElement* imp = static_cast<HTMLOptionElement*>(castedThis->impl());
    JSValue result = jsBoolean(imp->disabled());
    return result;
}

static inline bool isAcceptableElement(CollectionType type, Element* element)
{
    if (!element->isHTMLElement() && !(type == DocAll || type == NodeChildren))
        return false;

    switch (type) {
    case DocImages:
        return element->hasLocalName(imgTag);
    case DocScripts:
        return element->hasLocalName(scriptTag);
    case DocForms:
        return element->hasLocalName(formTag);
    case TableTBodies:
        return element->hasLocalName(tbodyTag);
    case TRCells:
        return element->hasLocalName(tdTag) || element->hasLocalName(thTag);
    case TSectionRows:
        return element->hasLocalName(trTag);
    case SelectOptions:
        return element->hasLocalName(optionTag);
    case SelectedOptions:
        return element->hasLocalName(optionTag) && toHTMLOptionElement(element)->selected();
    case DataListOptions:
        if (element->hasLocalName(optionTag)) {
            HTMLOptionElement* option = static_cast<HTMLOptionElement*>(element);
            if (!option->disabled() && !option->value().isEmpty())
                return true;
        }
        return false;
    case MapAreas:
        return element->hasLocalName(areaTag);
    case DocApplets:
        return element->hasLocalName(appletTag) || (element->hasLocalName(objectTag) && static_cast<HTMLObjectElement*>(element)->containsJavaApplet());
    case DocEmbeds:
        return element->hasLocalName(embedTag);
    case DocObjects:
        return element->hasLocalName(objectTag);
    case DocLinks:
        return (element->hasLocalName(aTag) || element->hasLocalName(areaTag)) && element->fastHasAttribute(hrefAttr);
    case DocAnchors:
        return element->hasLocalName(aTag) && element->fastHasAttribute(nameAttr);
    case DocAll:
    case NodeChildren:
        return true;
#if ENABLE(MICRODATA)
    case ItemProperties:
        return element->fastHasAttribute(itempropAttr);
#endif
    case FormControls:
    case DocumentNamedItems:
    case TableRows:
    case WindowNamedItems:
    case NodeListCollectionType:
        ASSERT_NOT_REACHED();
    }
    return false;
}

bool HTMLSelectElement::hasPlaceholderLabelOption() const
{
    // The select element has no placeholder label option if it has an attribute "multiple" specified or a display size of non-1.
    // 
    // The condition "size() > 1" is actually not compliant with the HTML5 spec as of Dec 3, 2010. "size() != 1" is correct.
    // Using "size() > 1" here because size() may be 0 in WebKit.
    // See the discussion at https://bugs.webkit.org/show_bug.cgi?id=43887
    //
    // "0 size()" happens when an attribute "size" is absent or an invalid size attribute is specified.
    // In this case, the display size should be assumed as the default.
    // The default display size is 1 for non-multiple select elements, and 4 for multiple select elements.
    //
    // Finally, if size() == 0 and non-multiple, the display size can be assumed as 1.
    if (multiple() || size() > 1)
        return false;

    int listIndex = optionToListIndex(0);
    ASSERT(listIndex >= 0);
    if (listIndex < 0)
        return false;
    HTMLOptionElement* option = static_cast<HTMLOptionElement*>(listItems()[listIndex]);
    return !option->disabled() && !listIndex && option->value().isEmpty();
}

Element* HTMLCollection::itemAfter(Element* previous) const
{
    bool deep = true;

    switch (m_type) {
        case DocAll:
        case DocAnchors:
        case DocApplets:
        case DocEmbeds:
        case DocForms:
        case DocImages:
        case DocLinks:
        case DocObjects:
        case DocScripts:
        case DocumentNamedItems:
        case MapAreas:
        case OtherCollection:
        case SelectOptions:
        case DataListOptions:
        case WindowNamedItems:
            break;
        case NodeChildren:
        case TRCells:
        case TSectionRows:
        case TableTBodies:
            deep = false;
            break;
    }

    Node* current;
    if (!previous)
        current = m_base->firstChild();
    else
        current = nextNodeOrSibling(m_base.get(), previous, deep);

    for (; current; current = nextNodeOrSibling(m_base.get(), current, deep)) {
        if (!current->isElementNode())
            continue;
        Element* e = static_cast<Element*>(current);
        switch (m_type) {
            case DocImages:
                if (e->hasLocalName(imgTag))
                    return e;
                break;
            case DocScripts:
                if (e->hasLocalName(scriptTag))
                    return e;
                break;
            case DocForms:
                if (e->hasLocalName(formTag))
                    return e;
                break;
            case TableTBodies:
                if (e->hasLocalName(tbodyTag))
                    return e;
                break;
            case TRCells:
                if (e->hasLocalName(tdTag) || e->hasLocalName(thTag))
                    return e;
                break;
            case TSectionRows:
                if (e->hasLocalName(trTag))
                    return e;
                break;
            case SelectOptions:
                if (e->hasLocalName(optionTag))
                    return e;
                break;
            case DataListOptions:
                if (e->hasLocalName(optionTag)) {
                    HTMLOptionElement* option = static_cast<HTMLOptionElement*>(e);
                    if (!option->disabled() && !option->value().isEmpty())
                        return e;
                }
                break;
            case MapAreas:
                if (e->hasLocalName(areaTag))
                    return e;
                break;
            case DocApplets: // all <applet> elements and <object> elements that contain Java Applets
                // weolar
                __asm int 3;
//                 if (e->hasLocalName(appletTag))
//                     return e;
//                 if (e->hasLocalName(objectTag) && static_cast<HTMLObjectElement*>(e)->containsJavaApplet())
//                     return e;
                break;
            case DocEmbeds:
                if (e->hasLocalName(embedTag))
                    return e;
                break;
            case DocObjects:
                if (e->hasLocalName(objectTag))
                    return e;
                break;
            case DocLinks: // all <a> and <area> elements with a value for href
                if ((e->hasLocalName(aTag) || e->hasLocalName(areaTag)) && e->fastHasAttribute(hrefAttr))
                    return e;
                break;
            case DocAnchors: // all <a> elements with a value for name
//.........这里部分代码省略.........

static v8::Handle<v8::Value> disabledAttrGetter(v8::Local<v8::String> name, const v8::AccessorInfo& info) {
    INC_STATS("DOM.HTMLOptionElement.disabled._get");
    HTMLOptionElement* imp = V8HTMLOptionElement::toNative(info.Holder());
    return v8Boolean(imp->disabled());
}

void HTMLSelectElement::listBoxDefaultEventHandler(Event* evt)
{
    if (evt->type() == eventNames().mousedownEvent && evt->isMouseEvent() && static_cast<MouseEvent*>(evt)->button() == LeftButton) {
        focus();
        
        MouseEvent* mEvt = static_cast<MouseEvent*>(evt);
        int listIndex = static_cast<RenderListBox*>(renderer())->listIndexAtOffset(mEvt->offsetX(), mEvt->offsetY());
        if (listIndex >= 0) {
            // Save the selection so it can be compared to the new selection when we call onChange during mouseup, or after autoscroll finishes.
            saveLastSelection();

            m_activeSelectionState = true;
            
            bool multiSelectKeyPressed = false;
#if PLATFORM(MAC)
            multiSelectKeyPressed = mEvt->metaKey();
#else
            multiSelectKeyPressed = mEvt->ctrlKey();
#endif

            bool shiftSelect = multiple() && mEvt->shiftKey();
            bool multiSelect = multiple() && multiSelectKeyPressed && !mEvt->shiftKey();
            
            HTMLElement* clickedElement = listItems()[listIndex];            
            HTMLOptionElement* option = 0;
            if (clickedElement->hasLocalName(optionTag)) {
                option = static_cast<HTMLOptionElement*>(clickedElement);
                
                // Keep track of whether an active selection (like during drag selection), should select or deselect
                if (option->selected() && multiSelectKeyPressed)
                    m_activeSelectionState = false;

                if (!m_activeSelectionState)
                    option->setSelectedState(false);
            }
            
            // If we're not in any special multiple selection mode, then deselect all other items, excluding the clicked option.
            // If no option was clicked, then this will deselect all items in the list.
            if (!shiftSelect && !multiSelect)
                deselectItems(option);

            // If the anchor hasn't been set, and we're doing a single selection or a shift selection, then initialize the anchor to the first selected index.
            if (m_activeSelectionAnchorIndex < 0 && !multiSelect)
                setActiveSelectionAnchorIndex(selectedIndex());

            // Set the selection state of the clicked option
            if (option && !option->disabled())
                option->setSelectedState(true);
            
            // If there was no selectedIndex() for the previous initialization, or
            // If we're doing a single selection, or a multiple selection (using cmd or ctrl), then initialize the anchor index to the listIndex that just got clicked.
            if (listIndex >= 0 && (m_activeSelectionAnchorIndex < 0 || !shiftSelect))
                setActiveSelectionAnchorIndex(listIndex);
            
            setActiveSelectionEndIndex(listIndex);
            updateListBoxSelection(!multiSelect);

            if (Frame* frame = document()->frame())
                frame->eventHandler()->setMouseDownMayStartAutoscroll();

            evt->setDefaultHandled();
        }
    } else if (evt->type() == eventNames().mouseupEvent && evt->isMouseEvent() && static_cast<MouseEvent*>(evt)->button() == LeftButton && document()->frame()->eventHandler()->autoscrollRenderer() != renderer())
        // This makes sure we fire onChange for a single click.  For drag selection, onChange will fire when the autoscroll timer stops.
        listBoxOnChange();
    else if (evt->type() == eventNames().keydownEvent) {
        if (!evt->isKeyboardEvent())
            return;
        String keyIdentifier = static_cast<KeyboardEvent*>(evt)->keyIdentifier();

        int endIndex = 0;        
        if (m_activeSelectionEndIndex < 0) {
            // Initialize the end index
            if (keyIdentifier == "Down")
                endIndex = nextSelectableListIndex(lastSelectedListIndex());
            else if (keyIdentifier == "Up")
                endIndex = previousSelectableListIndex(optionToListIndex(selectedIndex()));
        } else {
            // Set the end index based on the current end index
            if (keyIdentifier == "Down")
                endIndex = nextSelectableListIndex(m_activeSelectionEndIndex);
            else if (keyIdentifier == "Up")
                endIndex = previousSelectableListIndex(m_activeSelectionEndIndex);    
        }
        
        if (keyIdentifier == "Down" || keyIdentifier == "Up") {
            // Save the selection so it can be compared to the new selection when we call onChange immediately after making the new selection.
            saveLastSelection();

            ASSERT(endIndex >= 0 && (unsigned)endIndex < listItems().size()); 
            setActiveSelectionEndIndex(endIndex);
            
            // If the anchor is unitialized, or if we're going to deselect all other options, then set the anchor index equal to the end index.
            bool deselectOthers = !multiple() || !static_cast<KeyboardEvent*>(evt)->shiftKey();
            if (m_activeSelectionAnchorIndex < 0 || deselectOthers) {
                m_activeSelectionState = true;
                if (deselectOthers)
                    deselectItems();
                setActiveSelectionAnchorIndex(m_activeSelectionEndIndex);
            }
//.........这里部分代码省略.........