C++ RenderElement::document方法代码示例

FloatSize CSSCrossfadeValue::fixedSize(const RenderElement& renderer)
{
    float percentage = m_percentageValue->floatValue();
    float inversePercentage = 1 - percentage;

    // FIXME: Skip Content Security Policy check when cross fade is applied to an element in a user agent shadow tree.
    // See <https://bugs.webkit.org/show_bug.cgi?id=146663>.
    auto options = CachedResourceLoader::defaultCachedResourceOptions();

    auto& cachedResourceLoader = renderer.document().cachedResourceLoader();
    auto* cachedFromImage = cachedImageForCSSValue(m_fromValue, cachedResourceLoader, options);
    auto* cachedToImage = cachedImageForCSSValue(m_toValue, cachedResourceLoader, options);

    if (!cachedFromImage || !cachedToImage)
        return FloatSize();

    FloatSize fromImageSize = cachedFromImage->imageForRenderer(&renderer)->size();
    FloatSize toImageSize = cachedToImage->imageForRenderer(&renderer)->size();

    // Rounding issues can cause transitions between images of equal size to return
    // a different fixed size; avoid performing the interpolation if the images are the same size.
    if (fromImageSize == toImageSize)
        return fromImageSize;

    return fromImageSize * inversePercentage + toImageSize * percentage;
}

static inline void removeFromCacheAndInvalidateDependencies(RenderElement& renderer, bool needsLayout)
{
    if (auto* resources = SVGResourcesCache::cachedResourcesForRenderer(renderer)) {
        if (RenderSVGResourceFilter* filter = resources->filter())
            filter->removeClientFromCache(renderer);

        if (RenderSVGResourceMasker* masker = resources->masker())
            masker->removeClientFromCache(renderer);

        if (RenderSVGResourceClipper* clipper = resources->clipper())
            clipper->removeClientFromCache(renderer);
    }

    if (!renderer.element() || !renderer.element()->isSVGElement())
        return;
    HashSet<SVGElement*>* dependencies = renderer.document().accessSVGExtensions().setOfElementsReferencingTarget(downcast<SVGElement>(renderer.element()));
    if (!dependencies)
        return;

    // We allow cycles in SVGDocumentExtensions reference sets in order to avoid expensive
    // reference graph adjustments on changes, so we need to break possible cycles here.
    static NeverDestroyed<HashSet<SVGElement*>> invalidatingDependencies;

    for (auto* element : *dependencies) {
        if (auto* renderer = element->renderer()) {
            if (UNLIKELY(!invalidatingDependencies.get().add(element).isNewEntry)) {
                // Reference cycle: we are in process of invalidating this dependant.
                continue;
            }
            RenderSVGResource::markForLayoutAndParentResourceInvalidation(*renderer, needsLayout);
            invalidatingDependencies.get().remove(element);
        }
    }
}

bool AnimationController::updateAnimations(RenderElement& renderer, const RenderStyle& newStyle, std::unique_ptr<RenderStyle>& animatedStyle)
{
    auto* oldStyle = renderer.hasInitializedStyle() ? &renderer.style() : nullptr;
    if ((!oldStyle || (!oldStyle->animations() && !oldStyle->transitions())) && (!newStyle.animations() && !newStyle.transitions()))
        return false;

    if (renderer.document().pageCacheState() != Document::NotInPageCache)
        return false;

    // Don't run transitions when printing.
    if (renderer.view().printing())
        return false;

    // Fetch our current set of implicit animations from a hashtable.  We then compare them
    // against the animations in the style and make sure we're in sync.  If destination values
    // have changed, we reset the animation.  We then do a blend to get new values and we return
    // a new style.

    // We don't support anonymous pseudo elements like :first-line or :first-letter.
    ASSERT(renderer.element());

    CompositeAnimation& rendererAnimations = m_data->ensureCompositeAnimation(renderer);
    bool animationStateChanged = rendererAnimations.animate(renderer, oldStyle, newStyle, animatedStyle);

    if (renderer.parent() || newStyle.animations() || (oldStyle && oldStyle->animations())) {
        m_data->updateAnimationTimerForRenderer(renderer);
#if ENABLE(REQUEST_ANIMATION_FRAME)
        renderer.view().frameView().scheduleAnimation();
#endif
    }

    return animationStateChanged;
}

PassRef<RenderStyle> AnimationController::updateAnimations(RenderElement& renderer, PassRef<RenderStyle> newStyle)
{
    // Don't do anything if we're in the cache
    if (renderer.document().inPageCache())
        return newStyle;

    RenderStyle* oldStyle = renderer.hasInitializedStyle() ? &renderer.style() : nullptr;

    if ((!oldStyle || (!oldStyle->animations() && !oldStyle->transitions())) && (!newStyle.get().animations() && !newStyle.get().transitions()))
        return newStyle;

    // Don't run transitions when printing.
    if (renderer.view().printing())
        return newStyle;

    // Fetch our current set of implicit animations from a hashtable.  We then compare them
    // against the animations in the style and make sure we're in sync.  If destination values
    // have changed, we reset the animation.  We then do a blend to get new values and we return
    // a new style.

    // We don't support anonymous pseudo elements like :first-line or :first-letter.
    ASSERT(renderer.element());

    Ref<RenderStyle> newStyleBeforeAnimation(std::move(newStyle));

    CompositeAnimation& rendererAnimations = m_data->ensureCompositeAnimation(&renderer);
    auto blendedStyle = rendererAnimations.animate(renderer, oldStyle, newStyleBeforeAnimation.get());

    if (renderer.parent() || newStyleBeforeAnimation->animations() || (oldStyle && oldStyle->animations())) {
        m_data->updateAnimationTimerForRenderer(&renderer);
#if ENABLE(REQUEST_ANIMATION_FRAME)
        renderer.view().frameView().scheduleAnimation();
#endif
    }

    if (&blendedStyle.get() != &newStyleBeforeAnimation.get()) {
        // If the animations/transitions change opacity or transform, we need to update
        // the style to impose the stacking rules. Note that this is also
        // done in StyleResolver::adjustRenderStyle().
        if (blendedStyle.get().hasAutoZIndex() && (blendedStyle.get().opacity() < 1.0f || blendedStyle.get().hasTransform()))
            blendedStyle.get().setZIndex(0);
    }
    return blendedStyle;
}

LayoutRect AccessibilityListBoxOption::elementRect() const
{
    LayoutRect rect;
    if (!m_optionElement)
        return rect;
    
    HTMLSelectElement* listBoxParentNode = listBoxOptionParentNode();
    if (!listBoxParentNode)
        return rect;
    
    RenderElement* listBoxRenderer = listBoxParentNode->renderer();
    if (!listBoxRenderer)
        return rect;
    
    LayoutRect parentRect = listBoxRenderer->document().axObjectCache()->getOrCreate(listBoxRenderer)->boundingBoxRect();
    int index = listBoxOptionIndex();
    if (index != -1)
        rect = downcast<RenderListBox>(*listBoxRenderer).itemBoundingBoxRect(parentRect.location(), index);
    
    return rect;
}