--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/html/HTMLLabelElement.cpp	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,168 @@
+/*
+ * 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, 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 "HTMLLabelElement.h"
+
+#include "Document.h"
+#include "Event.h"
+#include "EventNames.h"
+#include "HTMLFormControlElement.h"
+#include "HTMLFormElement.h"
+#include "HTMLNames.h"
+
+namespace WebCore {
+
+using namespace HTMLNames;
+
+static HTMLFormControlElement* nodeAsLabelableFormControl(Node* node)
+{
+    if (!node || !node->isElementNode() || !static_cast<Element*>(node)->isFormControlElement())
+        return 0;
+    
+    HTMLFormControlElement* formControlElement = static_cast<HTMLFormControlElement*>(node);
+    if (!formControlElement->isLabelable())
+        return 0;
+
+    return formControlElement;
+}
+
+inline HTMLLabelElement::HTMLLabelElement(const QualifiedName& tagName, Document* document)
+    : HTMLElement(tagName, document)
+{
+    ASSERT(hasTagName(labelTag));
+}
+
+PassRefPtr<HTMLLabelElement> HTMLLabelElement::create(const QualifiedName& tagName, Document* document)
+{
+    return adoptRef(new HTMLLabelElement(tagName, document));
+}
+
+bool HTMLLabelElement::isFocusable() const
+{
+    return false;
+}
+
+HTMLFormControlElement* HTMLLabelElement::control()
+{
+    const AtomicString& controlId = getAttribute(forAttr);
+    if (controlId.isNull()) {
+        // Search the children and descendants of the label element for a form element.
+        // per http://dev.w3.org/html5/spec/Overview.html#the-label-element
+        // the form element must be "labelable form-associated element".
+        Node* node = this;
+        while ((node = node->traverseNextNode(this))) {
+            if (HTMLFormControlElement* formControlElement = nodeAsLabelableFormControl(node))
+                return formControlElement;
+        }
+        return 0;
+    }
+    
+    // Find the first element whose id is controlId. If it is found and it is a labelable form control,
+    // return it, otherwise return 0.
+    return nodeAsLabelableFormControl(document()->getElementById(controlId));
+}
+
+void HTMLLabelElement::setActive(bool down, bool pause)
+{
+    if (down == active())
+        return;
+
+    // Update our status first.
+    HTMLElement::setActive(down, pause);
+
+    // Also update our corresponding control.
+    if (HTMLElement* element = control())
+        element->setActive(down, pause);
+}
+
+void HTMLLabelElement::setHovered(bool over)
+{
+    if (over == hovered())
+        return;
+        
+    // Update our status first.
+    HTMLElement::setHovered(over);
+
+    // Also update our corresponding control.
+    if (HTMLElement* element = control())
+        element->setHovered(over);
+}
+
+void HTMLLabelElement::defaultEventHandler(Event* evt)
+{
+    static bool processingClick = false;
+
+    if (evt->type() == eventNames().clickEvent && !processingClick) {
+        RefPtr<HTMLElement> element = control();
+
+        // If we can't find a control or if the control received the click
+        // event, then there's no need for us to do anything.
+        if (!element || (evt->target() && element->contains(evt->target()->toNode())))
+            return;
+
+        processingClick = true;
+
+        // Click the corresponding control.
+        element->dispatchSimulatedClick(evt);
+
+        // If the control can be focused via the mouse, then do that too.
+        if (element->isMouseFocusable())
+            element->focus();
+
+        processingClick = false;
+        
+        evt->setDefaultHandled();
+    }
+    
+    HTMLElement::defaultEventHandler(evt);
+}
+
+void HTMLLabelElement::focus(bool)
+{
+    // to match other browsers, always restore previous selection
+    if (HTMLElement* element = control())
+        element->focus();
+}
+
+void HTMLLabelElement::accessKeyAction(bool sendToAnyElement)
+{
+    if (HTMLElement* element = control())
+        element->accessKeyAction(sendToAnyElement);
+    else
+        HTMLElement::accessKeyAction(sendToAnyElement);
+}
+
+void HTMLLabelElement::parseMappedAttribute(Attribute* attribute)
+{
+    if (attribute->name() == forAttr) {
+        // htmlFor attribute change affects other nodes than this.
+        // Clear the caches to ensure that the labels caches are cleared.
+        if (document())
+            document()->notifyLocalNodeListsLabelChanged();
+    } else
+        HTMLElement::parseMappedAttribute(attribute);
+}
+                
+} // namespace