зеркало из https://github.com/mozilla/gecko-dev.git
432 строки
13 KiB
C++
432 строки
13 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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#include "mozilla/dom/HTMLMenuItemElement.h"
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#include "mozilla/BasicEvents.h"
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#include "mozilla/EventDispatcher.h"
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#include "mozilla/dom/HTMLMenuItemElementBinding.h"
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#include "nsAttrValueInlines.h"
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#include "nsContentUtils.h"
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NS_IMPL_NS_NEW_HTML_ELEMENT_CHECK_PARSER(MenuItem)
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namespace mozilla::dom {
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// First bits are needed for the menuitem type.
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#define NS_CHECKED_IS_TOGGLED (1 << 2)
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#define NS_ORIGINAL_CHECKED_VALUE (1 << 3)
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#define NS_MENUITEM_TYPE(bits) \
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((bits) & ~(NS_CHECKED_IS_TOGGLED | NS_ORIGINAL_CHECKED_VALUE))
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enum CmdType : uint8_t {
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CMD_TYPE_MENUITEM = 1,
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CMD_TYPE_CHECKBOX,
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CMD_TYPE_RADIO
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};
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static const nsAttrValue::EnumTable kMenuItemTypeTable[] = {
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{"menuitem", CMD_TYPE_MENUITEM},
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{"checkbox", CMD_TYPE_CHECKBOX},
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{"radio", CMD_TYPE_RADIO},
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{nullptr, 0}};
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static const nsAttrValue::EnumTable* kMenuItemDefaultType =
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&kMenuItemTypeTable[0];
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// A base class inherited by all radio visitors.
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class Visitor {
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public:
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Visitor() = default;
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virtual ~Visitor() = default;
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/**
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* Visit a node in the tree. This is meant to be called on all radios in a
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* group, sequentially. If the method returns false then the iteration is
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* stopped.
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*/
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virtual bool Visit(HTMLMenuItemElement* aMenuItem) = 0;
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};
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// Find the selected radio, see GetSelectedRadio().
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class GetCheckedVisitor : public Visitor {
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public:
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explicit GetCheckedVisitor(HTMLMenuItemElement** aResult)
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: mResult(aResult) {}
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virtual bool Visit(HTMLMenuItemElement* aMenuItem) override {
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if (aMenuItem->IsChecked()) {
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*mResult = aMenuItem;
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return false;
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}
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return true;
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}
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protected:
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HTMLMenuItemElement** mResult;
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};
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// Deselect all radios except the one passed to the constructor.
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class ClearCheckedVisitor : public Visitor {
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public:
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explicit ClearCheckedVisitor(HTMLMenuItemElement* aExcludeMenuItem)
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: mExcludeMenuItem(aExcludeMenuItem) {}
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virtual bool Visit(HTMLMenuItemElement* aMenuItem) override {
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if (aMenuItem != mExcludeMenuItem && aMenuItem->IsChecked()) {
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aMenuItem->ClearChecked();
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}
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return true;
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}
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protected:
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HTMLMenuItemElement* mExcludeMenuItem;
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};
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// Get current value of the checked dirty flag. The same value is stored on all
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// radios in the group, so we need to check only the first one.
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class GetCheckedDirtyVisitor : public Visitor {
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public:
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GetCheckedDirtyVisitor(bool* aCheckedDirty,
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HTMLMenuItemElement* aExcludeMenuItem)
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: mCheckedDirty(aCheckedDirty), mExcludeMenuItem(aExcludeMenuItem) {}
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virtual bool Visit(HTMLMenuItemElement* aMenuItem) override {
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if (aMenuItem == mExcludeMenuItem) {
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return true;
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}
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*mCheckedDirty = aMenuItem->IsCheckedDirty();
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return false;
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}
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protected:
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bool* mCheckedDirty;
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HTMLMenuItemElement* mExcludeMenuItem;
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};
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// Set checked dirty to true on all radios in the group.
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class SetCheckedDirtyVisitor : public Visitor {
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public:
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SetCheckedDirtyVisitor() = default;
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virtual bool Visit(HTMLMenuItemElement* aMenuItem) override {
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aMenuItem->SetCheckedDirty();
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return true;
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}
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};
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// A helper visitor that is used to combine two operations (visitors) to avoid
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// iterating over radios twice.
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class CombinedVisitor : public Visitor {
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public:
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CombinedVisitor(Visitor* aVisitor1, Visitor* aVisitor2)
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: mVisitor1(aVisitor1),
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mVisitor2(aVisitor2),
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mContinue1(true),
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mContinue2(true) {}
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virtual bool Visit(HTMLMenuItemElement* aMenuItem) override {
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if (mContinue1) {
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mContinue1 = mVisitor1->Visit(aMenuItem);
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}
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if (mContinue2) {
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mContinue2 = mVisitor2->Visit(aMenuItem);
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}
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return mContinue1 || mContinue2;
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}
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protected:
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Visitor* mVisitor1;
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Visitor* mVisitor2;
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bool mContinue1;
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bool mContinue2;
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};
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HTMLMenuItemElement::HTMLMenuItemElement(
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already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo,
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FromParser aFromParser)
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: nsGenericHTMLElement(std::move(aNodeInfo)),
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mType(kMenuItemDefaultType->value),
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mParserCreating(false),
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mShouldInitChecked(false),
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mCheckedDirty(false),
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mChecked(false) {
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mParserCreating = aFromParser;
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}
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HTMLMenuItemElement::~HTMLMenuItemElement() = default;
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// NS_IMPL_ELEMENT_CLONE(HTMLMenuItemElement)
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nsresult HTMLMenuItemElement::Clone(dom::NodeInfo* aNodeInfo,
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nsINode** aResult) const {
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*aResult = nullptr;
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RefPtr<HTMLMenuItemElement> it = new (aNodeInfo->NodeInfoManager())
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HTMLMenuItemElement(do_AddRef(aNodeInfo), NOT_FROM_PARSER);
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nsresult rv = const_cast<HTMLMenuItemElement*>(this)->CopyInnerTo(it);
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if (NS_SUCCEEDED(rv)) {
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switch (mType) {
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case CMD_TYPE_CHECKBOX:
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case CMD_TYPE_RADIO:
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if (mCheckedDirty) {
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// We no longer have our original checked state. Set our
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// checked state on the clone.
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it->mCheckedDirty = true;
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it->mChecked = mChecked;
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}
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break;
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}
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it.forget(aResult);
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}
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return rv;
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}
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void HTMLMenuItemElement::GetType(DOMString& aValue) {
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GetEnumAttr(nsGkAtoms::type, kMenuItemDefaultType->tag, aValue);
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}
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void HTMLMenuItemElement::SetChecked(bool aChecked) {
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bool checkedChanged = mChecked != aChecked;
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mChecked = aChecked;
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if (mType == CMD_TYPE_RADIO) {
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if (checkedChanged) {
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if (mCheckedDirty) {
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ClearCheckedVisitor visitor(this);
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WalkRadioGroup(&visitor);
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} else {
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ClearCheckedVisitor visitor1(this);
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SetCheckedDirtyVisitor visitor2;
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CombinedVisitor visitor(&visitor1, &visitor2);
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WalkRadioGroup(&visitor);
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}
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} else if (!mCheckedDirty) {
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SetCheckedDirtyVisitor visitor;
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WalkRadioGroup(&visitor);
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}
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} else {
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mCheckedDirty = true;
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}
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}
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void HTMLMenuItemElement::GetEventTargetParent(EventChainPreVisitor& aVisitor) {
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if (aVisitor.mEvent->mMessage == eMouseClick) {
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bool originalCheckedValue = false;
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switch (mType) {
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case CMD_TYPE_CHECKBOX:
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originalCheckedValue = mChecked;
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SetChecked(!originalCheckedValue);
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aVisitor.mItemFlags |= NS_CHECKED_IS_TOGGLED;
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break;
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case CMD_TYPE_RADIO:
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// casting back to Element* here to resolve nsISupports ambiguity.
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Element* supports = GetSelectedRadio();
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aVisitor.mItemData = supports;
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originalCheckedValue = mChecked;
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if (!originalCheckedValue) {
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SetChecked(true);
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aVisitor.mItemFlags |= NS_CHECKED_IS_TOGGLED;
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}
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break;
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}
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if (originalCheckedValue) {
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aVisitor.mItemFlags |= NS_ORIGINAL_CHECKED_VALUE;
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}
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// We must cache type because mType may change during JS event.
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aVisitor.mItemFlags |= mType;
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}
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nsGenericHTMLElement::GetEventTargetParent(aVisitor);
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}
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nsresult HTMLMenuItemElement::PostHandleEvent(EventChainPostVisitor& aVisitor) {
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// Check to see if the event was cancelled.
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if (aVisitor.mEvent->mMessage == eMouseClick &&
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aVisitor.mItemFlags & NS_CHECKED_IS_TOGGLED &&
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aVisitor.mEventStatus == nsEventStatus_eConsumeNoDefault) {
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bool originalCheckedValue =
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!!(aVisitor.mItemFlags & NS_ORIGINAL_CHECKED_VALUE);
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uint8_t oldType = NS_MENUITEM_TYPE(aVisitor.mItemFlags);
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nsCOMPtr<nsIContent> content(do_QueryInterface(aVisitor.mItemData));
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RefPtr<HTMLMenuItemElement> selectedRadio =
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HTMLMenuItemElement::FromNodeOrNull(content);
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if (selectedRadio) {
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selectedRadio->SetChecked(true);
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if (mType != CMD_TYPE_RADIO) {
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SetChecked(false);
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}
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} else if (oldType == CMD_TYPE_CHECKBOX) {
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SetChecked(originalCheckedValue);
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}
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}
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return NS_OK;
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}
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nsresult HTMLMenuItemElement::BindToTree(BindContext& aContext,
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nsINode& aParent) {
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nsresult rv = nsGenericHTMLElement::BindToTree(aContext, aParent);
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NS_ENSURE_SUCCESS(rv, rv);
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if (IsInUncomposedDoc() && mType == CMD_TYPE_RADIO) {
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AddedToRadioGroup();
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}
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return rv;
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}
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bool HTMLMenuItemElement::ParseAttribute(int32_t aNamespaceID,
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nsAtom* aAttribute,
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const nsAString& aValue,
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nsIPrincipal* aMaybeScriptedPrincipal,
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nsAttrValue& aResult) {
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if (aNamespaceID == kNameSpaceID_None) {
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if (aAttribute == nsGkAtoms::type) {
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return aResult.ParseEnumValue(aValue, kMenuItemTypeTable, false,
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kMenuItemDefaultType);
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}
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if (aAttribute == nsGkAtoms::radiogroup) {
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aResult.ParseAtom(aValue);
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return true;
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}
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}
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return nsGenericHTMLElement::ParseAttribute(aNamespaceID, aAttribute, aValue,
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aMaybeScriptedPrincipal, aResult);
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}
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void HTMLMenuItemElement::DoneCreatingElement() {
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mParserCreating = false;
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if (mShouldInitChecked) {
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InitChecked();
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mShouldInitChecked = false;
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}
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}
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void HTMLMenuItemElement::GetText(nsAString& aText) {
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nsAutoString text;
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nsContentUtils::GetNodeTextContent(this, false, text);
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text.CompressWhitespace(true, true);
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aText = text;
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}
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nsresult HTMLMenuItemElement::AfterSetAttr(int32_t aNameSpaceID, nsAtom* aName,
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const nsAttrValue* aValue,
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const nsAttrValue* aOldValue,
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nsIPrincipal* aSubjectPrincipal,
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bool aNotify) {
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if (aNameSpaceID == kNameSpaceID_None) {
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// Handle type changes first, since some of the later conditions in this
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// method look at mType and want to see the new value.
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if (aName == nsGkAtoms::type) {
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if (aValue) {
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mType = aValue->GetEnumValue();
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} else {
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mType = kMenuItemDefaultType->value;
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}
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}
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if ((aName == nsGkAtoms::radiogroup || aName == nsGkAtoms::type) &&
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mType == CMD_TYPE_RADIO && !mParserCreating) {
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if (IsInUncomposedDoc() && GetParent()) {
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AddedToRadioGroup();
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}
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}
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// Checked must be set no matter what type of menuitem it is, since
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// GetChecked() must reflect the new value
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if (aName == nsGkAtoms::checked && !mCheckedDirty) {
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if (mParserCreating) {
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mShouldInitChecked = true;
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} else {
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InitChecked();
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}
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}
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}
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return nsGenericHTMLElement::AfterSetAttr(
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aNameSpaceID, aName, aValue, aOldValue, aSubjectPrincipal, aNotify);
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}
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void HTMLMenuItemElement::WalkRadioGroup(Visitor* aVisitor) {
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nsIContent* parent = GetParent();
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if (!parent) {
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aVisitor->Visit(this);
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return;
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}
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BorrowedAttrInfo info1(GetAttrInfo(kNameSpaceID_None, nsGkAtoms::radiogroup));
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bool info1Empty = !info1.mValue || info1.mValue->IsEmptyString();
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for (nsIContent* cur = parent->GetFirstChild(); cur;
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cur = cur->GetNextSibling()) {
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HTMLMenuItemElement* menuitem = HTMLMenuItemElement::FromNode(cur);
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if (!menuitem || menuitem->GetType() != CMD_TYPE_RADIO) {
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continue;
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}
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BorrowedAttrInfo info2(
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menuitem->GetAttrInfo(kNameSpaceID_None, nsGkAtoms::radiogroup));
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bool info2Empty = !info2.mValue || info2.mValue->IsEmptyString();
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if (info1Empty != info2Empty || (info1.mValue && info2.mValue &&
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!info1.mValue->Equals(*info2.mValue))) {
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continue;
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}
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if (!aVisitor->Visit(menuitem)) {
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break;
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}
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}
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}
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HTMLMenuItemElement* HTMLMenuItemElement::GetSelectedRadio() {
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HTMLMenuItemElement* result = nullptr;
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GetCheckedVisitor visitor(&result);
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WalkRadioGroup(&visitor);
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return result;
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}
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void HTMLMenuItemElement::AddedToRadioGroup() {
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bool checkedDirty = mCheckedDirty;
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if (mChecked) {
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ClearCheckedVisitor visitor1(this);
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GetCheckedDirtyVisitor visitor2(&checkedDirty, this);
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CombinedVisitor visitor(&visitor1, &visitor2);
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WalkRadioGroup(&visitor);
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} else {
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GetCheckedDirtyVisitor visitor(&checkedDirty, this);
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WalkRadioGroup(&visitor);
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}
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mCheckedDirty = checkedDirty;
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}
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void HTMLMenuItemElement::InitChecked() {
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bool defaultChecked = DefaultChecked();
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mChecked = defaultChecked;
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if (mType == CMD_TYPE_RADIO) {
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ClearCheckedVisitor visitor(this);
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WalkRadioGroup(&visitor);
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}
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}
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JSObject* HTMLMenuItemElement::WrapNode(JSContext* aCx,
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JS::Handle<JSObject*> aGivenProto) {
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return HTMLMenuItemElement_Binding::Wrap(aCx, this, aGivenProto);
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}
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} // namespace mozilla::dom
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#undef NS_ORIGINAL_CHECKED_VALUE
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