*** DO NOT LAND *** Attempt to understand Regions complexity

Source/core/dom/Element.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc. All rights reserved.
  *           (C) 2007 Eric Seidel (eric@webkit.org)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 71 matching lines @@
 #include "core/html/HTMLFrameOwnerElement.h"
 #include "core/html/HTMLLabelElement.h"
 #include "core/html/HTMLOptionsCollection.h"
 #include "core/html/HTMLTableRowsCollection.h"
 #include "core/html/HTMLTemplateElement.h"
 #include "core/html/parser/HTMLParserIdioms.h"
 #include "core/inspector/InspectorInstrumentation.h"
 #include "core/page/FocusController.h"
 #include "core/page/Page.h"
 #include "core/page/PointerLockController.h"
-#include "core/rendering/FlowThreadController.h"
-#include "core/rendering/RenderNamedFlowFragment.h"
 #include "core/rendering/RenderView.h"
 #include "core/rendering/RenderWidget.h"
 #include "core/svg/SVGDocumentExtensions.h"
 #include "core/svg/SVGElement.h"
 #include "wtf/BitVector.h"
 #include "wtf/HashFunctions.h"
 #include "wtf/text/CString.h"
 #include "wtf/text/StringBuilder.h"
 #include "wtf/text/TextPosition.h"
 
@@ skipping 83 matching lines @@
     return 0;
 }
 
 PassRefPtr<Element> Element::create(const QualifiedName& tagName, Document* document)
 {
     return adoptRef(new Element(tagName, document, CreateElement));
 }
 
 Element::~Element()
 {
-    // When the document is not destroyed, an element that was part of a named flow
-    // content nodes should have been removed from the content nodes collection
-    // and the inNamedFlow flag reset.
-    ASSERT(!document().renderView() || !inNamedFlow());
     ASSERT(needsAttach());
 
     if (hasRareData())
         elementRareData()->clearShadow();
 
     if (isCustomElement())
         CustomElement::wasDestroyed(this);
 
     if (hasSyntheticAttrChildNodes())
         detachAllAttrNodesFromElement();
@@ skipping 1237 matching lines @@
             if (ActiveAnimations* activeAnimations = data->activeAnimations()) {
                 activeAnimations->cssAnimations().cancel();
                 activeAnimations->setAnimationStyleChange(false);
             }
         }
     }
 
     InspectorInstrumentation::didRecalculateStyleForElement(this);
 }
 
-void Element::unregisterNamedFlowContentNode()
-{
-    if (RuntimeEnabledFeatures::cssRegionsEnabled() && inNamedFlow() && document().renderView())
-        document().renderView()->flowThreadController()->unregisterNamedFlowContentNode(this);
-}
-
 void Element::detach(const AttachContext& context)
 {
     RenderWidget::UpdateSuspendScope suspendWidgetHierarchyUpdates;
-    unregisterNamedFlowContentNode();
     cancelFocusAppearanceUpdate();
     removeCallbackSelectors();
     if (hasRareData()) {
         ElementRareData* data = elementRareData();
         data->clearPseudoElements();
-        data->setIsInsideRegion(false);
 
         // attach() will perform the below steps for us when inside recalcStyle.
         if (!document().inStyleRecalc()) {
             data->resetStyleState();
             data->clearComputedStyle();
             data->resetDynamicRestyleObservations();
         }
 
         if (RuntimeEnabledFeatures::webAnimationsCSSEnabled()) {
             if (ActiveAnimations* activeAnimations = data->activeAnimations()) {
@@ skipping 1201 matching lines @@
 void Element::setIsInCanvasSubtree(bool isInCanvasSubtree)
 {
     ensureElementRareData().setIsInCanvasSubtree(isInCanvasSubtree);
 }
 
 bool Element::isInCanvasSubtree() const
 {
     return hasRareData() && elementRareData()->isInCanvasSubtree();
 }
 
-void Element::setIsInsideRegion(bool value)
-{
-    if (value == isInsideRegion())
-        return;
-
-    ensureElementRareData().setIsInsideRegion(value);
-}
-
-bool Element::isInsideRegion() const
-{
-    return hasRareData() ? elementRareData()->isInsideRegion() : false;
-}
-
-void Element::setRegionOversetState(RegionOversetState state)
-{
-    ensureElementRareData().setRegionOversetState(state);
-}
-
-RegionOversetState Element::regionOversetState() const
-{
-    return hasRareData() ? elementRareData()->regionOversetState() : RegionUndefined;
-}
-
 AtomicString Element::computeInheritedLanguage() const
 {
     const Node* n = this;
     AtomicString value;
     // The language property is inherited, so we iterate over the parents to find the first language.
     do {
         if (n->isElementNode()) {
             if (const ElementData* elementData = toElement(n)->elementData()) {
                 // Spec: xml:lang takes precedence -- http://www.w3.org/TR/xhtml1/#C_7
                 if (const Attribute* attribute = elementData->getAttributeItem(XMLNames::langAttr))
@@ skipping 263 matching lines @@
         case SpellcheckAttributeFalse:
             return false;
         case SpellcheckAttributeDefault:
             break;
         }
     }
 
     return true;
 }
 
-RenderRegion* Element::renderRegion() const
-{
-    if (renderer() && renderer()->isRenderNamedFlowFragmentContainer())
-        return toRenderBlockFlow(renderer())->renderNamedFlowFragment();
-
-    return 0;
-}
-
-const AtomicString& Element::webkitRegionOverset() const
-{
-    DEFINE_STATIC_LOCAL(AtomicString, undefinedState, ("undefined", AtomicString::ConstructFromLiteral));
-    if (!RuntimeEnabledFeatures::cssRegionsEnabled())
-        return undefinedState;
-
-    document().updateLayoutIgnorePendingStylesheets();
-
-    if (!renderRegion())
-        return undefinedState;
-
-    switch (renderRegion()->regionOversetState()) {
-    case RegionFit: {
-        DEFINE_STATIC_LOCAL(AtomicString, fitState, ("fit", AtomicString::ConstructFromLiteral));
-        return fitState;
-    }
-    case RegionEmpty: {
-        DEFINE_STATIC_LOCAL(AtomicString, emptyState, ("empty", AtomicString::ConstructFromLiteral));
-        return emptyState;
-    }
-    case RegionOverset: {
-        DEFINE_STATIC_LOCAL(AtomicString, overflowState, ("overset", AtomicString::ConstructFromLiteral));
-        return overflowState;
-    }
-    case RegionUndefined:
-        return undefinedState;
-    }
-
-    ASSERT_NOT_REACHED();
-    return undefinedState;
-}
-
-Vector<RefPtr<Range> > Element::webkitGetRegionFlowRanges() const
-{
-    Vector<RefPtr<Range> > rangeObjects;
-    if (!RuntimeEnabledFeatures::cssRegionsEnabled())
-        return rangeObjects;
-
-    document().updateLayoutIgnorePendingStylesheets();
-
-    if (renderer() && renderer()->isRenderNamedFlowFragmentContainer()) {
-        RenderNamedFlowFragment* region = toRenderBlockFlow(renderer())->renderNamedFlowFragment();
-        if (region->isValid())
-            region->getRanges(rangeObjects);
-    }
-
-    return rangeObjects;
-}
-
 #ifndef NDEBUG
 bool Element::fastAttributeLookupAllowed(const QualifiedName& name) const
 {
     if (name == HTMLNames::styleAttr)
         return false;
 
     if (isSVGElement())
         return !toSVGElement(this)->isAnimatableAttribute(name);
 
     return true;
@@ skipping 570 matching lines @@
     // Before doing so, we need to resolve issues in HTMLSelectElement::recalcListItems
     // and RenderMenuList::setText. See also https://bugs.webkit.org/show_bug.cgi?id=88405
     if (hasTagName(optionTag) || hasTagName(optgroupTag))
         return false;
     if (FullscreenElementStack::isActiveFullScreenElement(this))
         return false;
     return true;
 }
 
 } // namespace WebCore