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/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 1999 Antti Koivisto (koivisto@kde.org)
* (C) 2001 Dirk Mueller (mueller@kde.org)
* Copyright (C) 2004-2019 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 "ElementIterator.h"
#include "Event.h"
#include "EventNames.h"
#include "FormAssociatedElement.h"
#include "HTMLFormControlElement.h"
#include "HTMLNames.h"
#include <wtf/IsoMallocInlines.h>
namespace WebCore {
WTF_MAKE_ISO_ALLOCATED_IMPL(HTMLLabelElement);
using namespace HTMLNames;
static LabelableElement* firstElementWithIdIfLabelable(TreeScope& treeScope, const AtomString& id)
{
auto element = makeRefPtr(treeScope.getElementById(id));
if (!is<LabelableElement>(element))
return nullptr;
auto& labelableElement = downcast<LabelableElement>(*element);
return labelableElement.supportLabels() ? &labelableElement : nullptr;
}
inline HTMLLabelElement::HTMLLabelElement(const QualifiedName& tagName, Document& document)
: HTMLElement(tagName, document)
{
ASSERT(hasTagName(labelTag));
}
Ref<HTMLLabelElement> HTMLLabelElement::create(const QualifiedName& tagName, Document& document)
{
return adoptRef(*new HTMLLabelElement(tagName, document));
}
RefPtr<LabelableElement> HTMLLabelElement::control() const
{
auto& controlId = attributeWithoutSynchronization(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".
for (auto& labelableElement : descendantsOfType<LabelableElement>(*this)) {
if (labelableElement.supportLabels())
return const_cast<LabelableElement*>(&labelableElement);
}
return nullptr;
}
return isConnected() ? firstElementWithIdIfLabelable(treeScope(), controlId) : nullptr;
}
HTMLFormElement* HTMLLabelElement::form() const
{
auto control = this->control();
if (!is<HTMLFormControlElement>(control))
return nullptr;
return downcast<HTMLFormControlElement>(control.get())->form();
}
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 (auto 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 (auto element = control())
element->setHovered(over);
}
bool HTMLLabelElement::isEventTargetedAtInteractiveDescendants(Event& event) const
{
if (!is<Node>(event.target()))
return false;
auto& node = downcast<Node>(*event.target());
if (!containsIncludingShadowDOM(&node))
return false;
for (const auto* it = &node; it && it != this; it = it->parentElementInComposedTree()) {
if (is<HTMLElement>(it) && downcast<HTMLElement>(*it).isInteractiveContent())
return true;
}
return false;
}
void HTMLLabelElement::defaultEventHandler(Event& event)
{
static bool processingClick = false;
if (event.type() == eventNames().clickEvent && !processingClick) {
auto control = this->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 (!control || (is<Node>(event.target()) && control->containsIncludingShadowDOM(&downcast<Node>(*event.target())))) {
HTMLElement::defaultEventHandler(event);
return;
}
// The activation behavior of a label element for events targeted at interactive
// content descendants of a label element, and any descendants of those interactive
// content descendants, must be to do nothing.
// https://html.spec.whatwg.org/#the-label-element
if (isEventTargetedAtInteractiveDescendants(event)) {
HTMLElement::defaultEventHandler(event);
return;
}
processingClick = true;
control->dispatchSimulatedClick(&event);
document().updateLayoutIgnorePendingStylesheets();
if (control->isMouseFocusable())
control->focus();
processingClick = false;
event.setDefaultHandled();
}
HTMLElement::defaultEventHandler(event);
}
bool HTMLLabelElement::willRespondToMouseClickEvents()
{
auto element = control();
return (element && element->willRespondToMouseClickEvents()) || HTMLElement::willRespondToMouseClickEvents();
}
void HTMLLabelElement::focus(bool restorePreviousSelection, FocusDirection direction)
{
Ref<HTMLLabelElement> protectedThis(*this);
if (document().haveStylesheetsLoaded()) {
document().updateLayout();
if (isFocusable()) {
// The value of restorePreviousSelection is not used for label elements as it doesn't override updateFocusAppearance.
Element::focus(restorePreviousSelection, direction);
return;
}
}
// To match other browsers, always restore previous selection.
if (auto element = control())
element->focus(true, direction);
}
bool HTMLLabelElement::accessKeyAction(bool sendMouseEvents)
{
if (auto element = control())
return element->accessKeyAction(sendMouseEvents);
return HTMLElement::accessKeyAction(sendMouseEvents);
}
} // namespace