Implement ShadowRoot.delegatesFocus 1/4 (focus navigation)

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 1796 matching lines @@
     ASSERT(RuntimeEnabledFeatures::createShadowRootWithParameterEnabled());
     UseCounter::count(document(), UseCounter::ElementCreateShadowRootWithParameter);
 
     OriginsUsingFeatures::count(scriptState, document(), OriginsUsingFeatures::Feature::ElementCreateShadowRoot);
     // TODO(kochi): Add support for closed shadow root. crbug.com/459136
     if (shadowRootInitDict.hasMode() && shadowRootInitDict.mode() == "closed") {
         exceptionState.throwDOMException(NotSupportedError, "Closed shadow root is not implemented yet.");
         return nullptr;
     }
 
-    return createShadowRoot(exceptionState);
+    RefPtrWillBeRawPtr<ShadowRoot> shadowRoot = createShadowRoot(exceptionState);
+
+    if (shadowRootInitDict.hasDelegatesFocus())
+        shadowRoot->setDelegatesFocus(shadowRootInitDict.delegatesFocus());
+
+    return shadowRoot.release();
 }
 
 PassRefPtrWillBeRawPtr<ShadowRoot> Element::createShadowRoot(ExceptionState& exceptionState)
 {
     if (alwaysCreateUserAgentShadowRoot())
         ensureUserAgentShadowRoot();
 
     // Some elements make assumptions about what kind of layoutObjects they allow
     // as children so we can't allow author shadows on them for now. An override
     // flag is provided for testing how author shadows interact on these elements.
@@ skipping 417 matching lines @@
 }
 
 bool Element::supportsFocus() const
 {
     // FIXME: supportsFocus() can be called when layout is not up to date.
     // Logic that deals with the layoutObject should be moved to layoutObjectIsFocusable().
     // But supportsFocus must return true when the element is editable, or else
     // it won't be focusable. Furthermore, supportsFocus cannot just return true
     // always or else tabIndex() will change for all HTML elements.
     return hasElementFlag(TabIndexWasSetExplicitly) || (hasEditableStyle() && parentNode() && !parentNode()->hasEditableStyle())
+        || (isShadowHost(this) && shadowRoot() && shadowRoot()->delegatesFocus())
         || supportsSpatialNavigationFocus();
 }
 
 bool Element::supportsSpatialNavigationFocus() const
 {
     // This function checks whether the element satisfies the extended criteria
     // for the element to be focusable, introduced by spatial navigation feature,
     // i.e. checks if click or keyboard event handler is specified.
     // This is the way to make it possible to navigate to (focus) elements
     // which web designer meant for being active (made them respond to click events).
@@ skipping 1123 matching lines @@
 {
 #if ENABLE(OILPAN)
     if (hasRareData())
         visitor->trace(elementRareData());
     visitor->trace(m_elementData);
 #endif
     ContainerNode::trace(visitor);
 }
 
 } // namespace blink