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3342b6100d
In order to speed up IsDisabled(), instead of querying for the @disabled attribute, we're now using the NS_EVENT_STATE_DISABLED flag to know whether an element is disabled. It is safe to use the NS_EVENT_STATE_DISABLED flag for the following reasons: - For form elements, nsGenericHTMLFormElement::IsDisabled() is only called on form elements that can be disabled; form elements that can't be disabled overrides IsDisabled() to return false directly. And, before this patch, NS_EVENT_STATE_DISABLED flag is set by nsGenericHTMLFormElement::IntrinsicState() if and only if IsDisabled() in all cases when CanBeDisabled() is true, and when CanBeDisabled() is false then IsDisabled() is always false and the flag is not set. - For non form elements, optgroup and option have the flag matching IsDisabled(). Note that option's IsDisabled() should also refer to optgroup's (if it exists) disabled state, which was not done before this patch. For this to work correctly, we need to set NS_EVENT_STATE_DISABLED earlier, that is, in AfterSetAttr(), before any consumer of IsDisabled(). We also need to update the flag whenever the element's parent (e.g. fieldset or optgroup) disabled state changes and when moving into/out of a parent container. Note that NS_EVENT_STATE_DISABLED/ENABLED is now part of the EXTERNALLY_MANAGED_STATES. MozReview-Commit-ID: KSceikeqvvU
86 lines
2.4 KiB
C++
86 lines
2.4 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/**
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* Declaration of HTML <label> elements.
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*/
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#ifndef HTMLLabelElement_h
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#define HTMLLabelElement_h
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#include "mozilla/Attributes.h"
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#include "nsGenericHTMLElement.h"
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#include "nsIDOMHTMLLabelElement.h"
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namespace mozilla {
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class EventChainPostVisitor;
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namespace dom {
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class HTMLLabelElement final : public nsGenericHTMLElement,
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public nsIDOMHTMLLabelElement
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{
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public:
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explicit HTMLLabelElement(already_AddRefed<mozilla::dom::NodeInfo>& aNodeInfo)
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: nsGenericHTMLElement(aNodeInfo),
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mHandlingEvent(false)
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{
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}
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NS_IMPL_FROMCONTENT_HTML_WITH_TAG(HTMLLabelElement, label)
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// nsISupports
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NS_DECL_ISUPPORTS_INHERITED
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// Element
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virtual bool IsInteractiveHTMLContent(bool aIgnoreTabindex) const override
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{
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return true;
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}
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// nsIDOMHTMLLabelElement
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NS_DECL_NSIDOMHTMLLABELELEMENT
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HTMLFormElement* GetForm() const;
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void GetHtmlFor(nsString& aHtmlFor)
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{
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GetHTMLAttr(nsGkAtoms::_for, aHtmlFor);
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}
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void SetHtmlFor(const nsAString& aHtmlFor, ErrorResult& aError)
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{
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SetHTMLAttr(nsGkAtoms::_for, aHtmlFor, aError);
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}
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nsGenericHTMLElement* GetControl() const
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{
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return GetLabeledElement();
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}
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using nsGenericHTMLElement::Focus;
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virtual void Focus(mozilla::ErrorResult& aError) override;
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// nsIContent
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virtual nsresult PostHandleEvent(
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EventChainPostVisitor& aVisitor) override;
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virtual bool PerformAccesskey(bool aKeyCausesActivation,
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bool aIsTrustedEvent) override;
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virtual nsresult Clone(mozilla::dom::NodeInfo *aNodeInfo, nsINode **aResult,
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bool aPreallocateChildren) const override;
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nsGenericHTMLElement* GetLabeledElement() const;
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protected:
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virtual ~HTMLLabelElement();
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virtual JSObject* WrapNode(JSContext *aCx, JS::Handle<JSObject*> aGivenProto) override;
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nsGenericHTMLElement* GetFirstLabelableDescendant() const;
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// XXX It would be nice if we could use an event flag instead.
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bool mHandlingEvent;
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};
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} // namespace dom
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} // namespace mozilla
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#endif /* HTMLLabelElement_h */
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