Implement select listbox using shadow DOM

Source/core/html/HTMLOptGroupElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2010 Apple Inc. All rights reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  *
  */
 
 #include "config.h"
 #include "core/html/HTMLOptGroupElement.h"
 
 #include "core/HTMLNames.h"
 #include "core/dom/NodeRenderStyle.h"
+#include "core/dom/Text.h"
+#include "core/editing/htmlediting.h"
+#include "core/html/HTMLContentElement.h"
+#include "core/html/HTMLDivElement.h"
 #include "core/html/HTMLSelectElement.h"
+#include "core/html/shadow/ShadowElementNames.h"
 #include "wtf/StdLibExtras.h"
+#include "wtf/unicode/CharacterNames.h"
 
 namespace WebCore {
 
 using namespace HTMLNames;
 
+PassRefPtrWillBeRawPtr<HTMLOptGroupElement> HTMLOptGroupElement::create(Document& document)
+{
+    RefPtrWillBeRawPtr<HTMLOptGroupElement> optGroupElement = adoptRefWillBeNoop(new HTMLOptGroupElement(document));
+    optGroupElement->ensureUserAgentShadowRoot();
+    return optGroupElement.release();
+}
+
 inline HTMLOptGroupElement::HTMLOptGroupElement(Document& document)
     : HTMLElement(optgroupTag, document)
 {
-    setHasCustomStyleCallbacks();
     ScriptWrappable::init(this);
 }
 
-DEFINE_NODE_FACTORY(HTMLOptGroupElement)
-
 bool HTMLOptGroupElement::isDisabledFormControl() const
 {
     return fastHasAttribute(disabledAttr);
 }
 
-bool HTMLOptGroupElement::rendererIsFocusable() const
-{
-    // Optgroup elements do not have a renderer so we check the renderStyle instead.
-    return renderStyle() && renderStyle()->display() != NONE;
-}
-
 void HTMLOptGroupElement::childrenChanged(bool changedByParser, Node* beforeChange, Node* afterChange, int childCountDelta)
 {
     recalcSelectOptions();
     HTMLElement::childrenChanged(changedByParser, beforeChange, afterChange, childCountDelta);
 }
 
 void HTMLOptGroupElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
 {
     HTMLElement::parseAttribute(name, value);
     recalcSelectOptions();
 
     if (name == disabledAttr)
         didAffectSelector(AffectedSelectorDisabled | AffectedSelectorEnabled);
+    else if (name == labelAttr)
+        updateGroupLabel();
 }
 
 void HTMLOptGroupElement::recalcSelectOptions()
 {
     if (HTMLSelectElement* select = Traversal<HTMLSelectElement>::firstAncestor(*this))
         select->setRecalcListItems();
 }
 
-void HTMLOptGroupElement::attach(const AttachContext& context)
-{
-    if (context.resolvedStyle) {
-        ASSERT(!m_style || m_style == context.resolvedStyle);
-        m_style = context.resolvedStyle;
-    }
-    HTMLElement::attach(context);
-}
-
-void HTMLOptGroupElement::detach(const AttachContext& context)
-{
-    m_style.clear();
-    HTMLElement::detach(context);
-}
-
-void HTMLOptGroupElement::updateNonRenderStyle()
-{
-    bool oldDisplayNoneStatus = isDisplayNone();
-    m_style = originalStyleForRenderer();
-    if (oldDisplayNoneStatus != isDisplayNone()) {
-        if (HTMLSelectElement* select = ownerSelectElement())
-            select->updateListOnRenderer();
-    }
-}
-
-RenderStyle* HTMLOptGroupElement::nonRendererStyle() const
-{
-    return m_style.get();
-}
-
-PassRefPtr<RenderStyle> HTMLOptGroupElement::customStyleForRenderer()
-{
-    updateNonRenderStyle();
-    return m_style;
-}
-
 String HTMLOptGroupElement::groupLabelText() const
 {
     String itemText = getAttribute(labelAttr);
 
     // In WinIE, leading and trailing whitespace is ignored in options and optgroups. We match this behavior.
     itemText = itemText.stripWhiteSpace();
     // We want to collapse our whitespace too.  This will match other browsers.
     itemText = itemText.simplifyWhiteSpace();
 
     return itemText;
 }
 
 HTMLSelectElement* HTMLOptGroupElement::ownerSelectElement() const
 {
     return Traversal<HTMLSelectElement>::firstAncestor(*this);
 }
 
 void HTMLOptGroupElement::accessKeyAction(bool)
 {
     HTMLSelectElement* select = ownerSelectElement();
     // send to the parent to bring focus to the list box
     if (select && !select->focused())
         select->accessKeyAction(false);
 }
 
-bool HTMLOptGroupElement::isDisplayNone() const
+void HTMLOptGroupElement::didAddUserAgentShadowRoot(ShadowRoot& root)
 {
-    RenderStyle* style = nonRendererStyle();
-    return style && style->display() == NONE;
+    RefPtrWillBeRawPtr<HTMLDivElement> label = HTMLDivElement::create(document());
+    label->setShadowPseudoId(AtomicString("-webkit-optgroup-label", AtomicString::ConstructFromLiteral));

[tkent, 2014/07/01 06:45:41]

We can't add non-standard pseudo ID.  Can we make this available only in UA
stylesheets?

[keishi, 2014/07/02 04:27:22]

I think it is hard to add pseudo ids that are only available for UA stylsheets
because UASheetMode is part of CSSParserContext and is only accessible while
parsing, not when we match selectors. I've used an inline style attribute to fix
this.

+    label->setIdAttribute(ShadowElementNames::optGroupLabel());
+    label->setTextContent(nonBreakingSpaceString());
+    root.appendChild(label);
+
+    RefPtrWillBeRawPtr<HTMLContentElement> content = HTMLContentElement::create(document());
+    content->setAttribute(selectAttr, "option,optgroup");
+    root.appendChild(content);
+}
+
+void HTMLOptGroupElement::updateGroupLabel()
+{
+    const String& labelText = groupLabelText();
+    optGroupLabelElement()->setTextContent(labelText.isEmpty() ? nonBreakingSpaceString() : labelText);
+}
+
+HTMLDivElement* HTMLOptGroupElement::optGroupLabelElement() const
+{
+    return toHTMLDivElement(userAgentShadowRoot()->getElementById(ShadowElementNames::optGroupLabel()));
 }
 
 } // namespace