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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
164 lines
4.9 KiB
C++
164 lines
4.9 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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#ifndef mozilla_dom_HTMLOptionElement_h__
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#define mozilla_dom_HTMLOptionElement_h__
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#include "mozilla/Attributes.h"
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#include "nsGenericHTMLElement.h"
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#include "nsIDOMHTMLOptionElement.h"
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#include "mozilla/dom/HTMLFormElement.h"
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namespace mozilla {
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namespace dom {
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class HTMLSelectElement;
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class HTMLOptionElement final : public nsGenericHTMLElement,
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public nsIDOMHTMLOptionElement
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{
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public:
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explicit HTMLOptionElement(already_AddRefed<mozilla::dom::NodeInfo>& aNodeInfo);
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static already_AddRefed<HTMLOptionElement>
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Option(const GlobalObject& aGlobal,
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const nsAString& aText,
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const Optional<nsAString>& aValue,
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bool aDefaultSelected,
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bool aSelected,
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ErrorResult& aError);
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NS_IMPL_FROMCONTENT_HTML_WITH_TAG(HTMLOptionElement, option)
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// nsISupports
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NS_DECL_ISUPPORTS_INHERITED
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// nsIDOMHTMLOptionElement
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using mozilla::dom::Element::SetText;
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using mozilla::dom::Element::GetText;
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NS_DECL_NSIDOMHTMLOPTIONELEMENT
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bool Selected() const;
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bool DefaultSelected() const;
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void SetSelectedChanged(bool aValue)
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{
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mSelectedChanged = aValue;
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}
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virtual nsChangeHint GetAttributeChangeHint(const nsIAtom* aAttribute,
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int32_t aModType) const override;
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virtual nsresult BeforeSetAttr(int32_t aNamespaceID, nsIAtom* aName,
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const nsAttrValueOrString* aValue,
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bool aNotify) override;
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virtual nsresult AfterSetAttr(int32_t aNameSpaceID, nsIAtom* aName,
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const nsAttrValue* aValue,
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const nsAttrValue* aOldValue,
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bool aNotify) override;
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void SetSelectedInternal(bool aValue, bool aNotify);
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/**
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* This callback is called by an optgroup on all its option elements whenever
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* its disabled state is changed so that option elements can know their
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* disabled state might have changed.
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*/
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void OptGroupDisabledChanged(bool aNotify);
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/**
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* Check our disabled content attribute and optgroup's (if it exists) disabled
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* state to decide whether our disabled flag should be toggled.
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*/
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void UpdateDisabledState(bool aNotify);
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virtual nsresult BindToTree(nsIDocument* aDocument, nsIContent* aParent,
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nsIContent* aBindingParent,
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bool aCompileEventHandlers) override;
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virtual void UnbindFromTree(bool aDeep = true,
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bool aNullParent = true) override;
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// nsIContent
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virtual EventStates IntrinsicState() const 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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nsresult CopyInnerTo(mozilla::dom::Element* aDest, bool aPreallocateChildren);
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virtual bool IsDisabled() const override {
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return State().HasState(NS_EVENT_STATE_DISABLED);
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}
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bool Disabled() const
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{
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return GetBoolAttr(nsGkAtoms::disabled);
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}
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void SetDisabled(bool aValue, ErrorResult& aRv)
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{
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SetHTMLBoolAttr(nsGkAtoms::disabled, aValue, aRv);
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}
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HTMLFormElement* GetForm();
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// The XPCOM GetLabel is OK for us
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void SetLabel(const nsAString& aLabel, ErrorResult& aError)
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{
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SetHTMLAttr(nsGkAtoms::label, aLabel, aError);
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}
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// The XPCOM DefaultSelected is OK for us
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void SetDefaultSelected(bool aValue, ErrorResult& aRv)
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{
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SetHTMLBoolAttr(nsGkAtoms::selected, aValue, aRv);
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}
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// The XPCOM Selected is OK for us
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void SetSelected(bool aValue, ErrorResult& aRv)
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{
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aRv = SetSelected(aValue);
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}
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// The XPCOM GetValue is OK for us
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void SetValue(const nsAString& aValue, ErrorResult& aRv)
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{
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SetHTMLAttr(nsGkAtoms::value, aValue, aRv);
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}
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// The XPCOM GetText is OK for us
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void SetText(const nsAString& aValue, ErrorResult& aRv)
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{
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aRv = SetText(aValue);
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}
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int32_t Index();
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protected:
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virtual ~HTMLOptionElement();
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virtual JSObject* WrapNode(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;
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/**
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* Get the select content element that contains this option, this
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* intentionally does not return nsresult, all we care about is if
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* there's a select associated with this option or not.
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*/
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HTMLSelectElement* GetSelect();
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bool mSelectedChanged;
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bool mIsSelected;
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// True only while we're under the SetOptionsSelectedByIndex call when our
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// "selected" attribute is changing and mSelectedChanged is false.
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bool mIsInSetDefaultSelected;
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};
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} // namespace dom
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} // namespace mozilla
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#endif // mozilla_dom_HTMLOptionElement_h__
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