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/*
* Copyright (C) 2012 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "core/html/HTMLDialogElement.h"
#include "bindings/core/v8/ExceptionState.h"
#include "core/dom/AXObjectCache.h"
#include "core/dom/ExceptionCode.h"
#include "core/dom/NodeTraversal.h"
#include "core/events/Event.h"
#include "core/frame/FrameView.h"
#include "core/frame/UseCounter.h"
#include "core/html/HTMLFormControlElement.h"
#include "core/style/ComputedStyle.h"
namespace blink {
using namespace HTMLNames;
// This function chooses the focused element when show() or showModal() is
// invoked, as described in their spec.
static void setFocusForDialog(HTMLDialogElement* dialog) {
Element* focusableDescendant = 0;
Node* next = 0;
for (Node* node = dialog->firstChild(); node; node = next) {
if (isHTMLDialogElement(*node))
next = NodeTraversal::nextSkippingChildren(*node, dialog);
else
next = NodeTraversal::next(*node, dialog);
if (!node->isElementNode())
continue;
Element* element = toElement(node);
if (element->isFormControlElement()) {
HTMLFormControlElement* control = toHTMLFormControlElement(node);
if (control->isAutofocusable() && control->isFocusable()) {
control->focus();
return;
}
}
if (!focusableDescendant && element->isFocusable())
focusableDescendant = element;
}
if (focusableDescendant) {
focusableDescendant->focus();
return;
}
if (dialog->isFocusable()) {
dialog->focus();
return;
}
dialog->document().clearFocusedElement();
}
static void inertSubtreesChanged(Document& document) {
// When a modal dialog opens or closes, nodes all over the accessibility
// tree can change inertness which means they must be added or removed from
// the tree. The most foolproof way is to clear the entire tree and rebuild
// it, though a more clever way is probably possible.
document.clearAXObjectCache();
if (AXObjectCache* cache = document.axObjectCache())
cache->childrenChanged(&document);
}
inline HTMLDialogElement::HTMLDialogElement(Document& document)
: HTMLElement(dialogTag, document),
m_centeringMode(NotCentered),
m_centeredPosition(0),
m_returnValue("") {
UseCounter::count(document, UseCounter::DialogElement);
}
DEFINE_NODE_FACTORY(HTMLDialogElement)
void HTMLDialogElement::close(const String& returnValue,
ExceptionState& exceptionState) {
if (!fastHasAttribute(openAttr)) {
exceptionState.throwDOMException(InvalidStateError,
"The element does not have an 'open' "
"attribute, and therefore cannot be "
"closed.");
return;
}
closeDialog(returnValue);
}
void HTMLDialogElement::closeDialog(const String& returnValue) {
if (!fastHasAttribute(openAttr))
return;
setBooleanAttribute(openAttr, false);
HTMLDialogElement* activeModalDialog = document().activeModalDialog();
document().removeFromTopLayer(this);
if (activeModalDialog == this)
inertSubtreesChanged(document());
if (!returnValue.isNull())
m_returnValue = returnValue;
scheduleCloseEvent();
}
void HTMLDialogElement::forceLayoutForCentering() {
m_centeringMode = NeedsCentering;
document().updateStyleAndLayoutIgnorePendingStylesheets();
if (m_centeringMode == NeedsCentering)
setNotCentered();
}
void HTMLDialogElement::scheduleCloseEvent() {
Event* event = Event::create(EventTypeNames::close);
event->setTarget(this);
document().enqueueAnimationFrameEvent(event);
}
void HTMLDialogElement::show() {
if (fastHasAttribute(openAttr))
return;
setBooleanAttribute(openAttr, true);
// The layout must be updated here because setFocusForDialog calls
// Element::isFocusable, which requires an up-to-date layout.
document().updateStyleAndLayoutIgnorePendingStylesheets();
setFocusForDialog(this);
}
void HTMLDialogElement::showModal(ExceptionState& exceptionState) {
if (fastHasAttribute(openAttr)) {
exceptionState.throwDOMException(InvalidStateError,
"The element already has an 'open' "
"attribute, and therefore cannot be "
"opened modally.");
return;
}
if (!isConnected()) {
exceptionState.throwDOMException(InvalidStateError,
"The element is not in a Document.");
return;
}
document().addToTopLayer(this);
setBooleanAttribute(openAttr, true);
// Throw away the AX cache first, so the subsequent steps don't have a chance
// of queuing up AX events on objects that would be invalidated when the cache
// is thrown away.
inertSubtreesChanged(document());
forceLayoutForCentering();
setFocusForDialog(this);
}
void HTMLDialogElement::removedFrom(ContainerNode* insertionPoint) {
HTMLElement::removedFrom(insertionPoint);
setNotCentered();
// FIXME: We should call inertSubtreesChanged() here.
}
void HTMLDialogElement::setCentered(LayoutUnit centeredPosition) {
DCHECK_EQ(m_centeringMode, NeedsCentering);
m_centeredPosition = centeredPosition;
m_centeringMode = Centered;
}
void HTMLDialogElement::setNotCentered() {
m_centeringMode = NotCentered;
}
bool HTMLDialogElement::isPresentationAttribute(
const QualifiedName& name) const {
// FIXME: Workaround for <https://bugs.webkit.org/show_bug.cgi?id=91058>:
// modifying an attribute for which there is an attribute selector in html.css
// sometimes does not trigger a style recalc.
if (name == openAttr)
return true;
return HTMLElement::isPresentationAttribute(name);
}
void HTMLDialogElement::defaultEventHandler(Event* event) {
if (event->type() == EventTypeNames::cancel) {
closeDialog();
event->setDefaultHandled();
return;
}
HTMLElement::defaultEventHandler(event);
}
} // namespace blink
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