зеркало из https://github.com/mozilla/gecko-dev.git
93 строки
2.9 KiB
C++
93 строки
2.9 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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 ChangeAttributeTransaction_h
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#define ChangeAttributeTransaction_h
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#include "mozilla/Attributes.h" // override
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#include "mozilla/EditTransactionBase.h" // base class
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#include "nsCOMPtr.h" // nsCOMPtr members
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#include "nsCycleCollectionParticipant.h" // NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED
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#include "nsISupportsImpl.h" // NS_DECL_ISUPPORTS_INHERITED
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#include "nsString.h" // nsString members
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class nsAtom;
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namespace mozilla {
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namespace dom {
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class Element;
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} // namespace dom
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/**
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* A transaction that changes an attribute of a content node. This transaction
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* covers add, remove, and change attribute.
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*/
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class ChangeAttributeTransaction final : public EditTransactionBase
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{
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protected:
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ChangeAttributeTransaction(dom::Element& aElement,
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nsAtom& aAttribute,
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const nsAString* aValue);
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public:
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/**
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* Creates a change attribute transaction to set an attribute to something.
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* This method never returns nullptr.
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*
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* @param aElement The element whose attribute will be changed.
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* @param aAttribute The name of the attribute to change.
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* @param aValue The new value for aAttribute.
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*/
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static already_AddRefed<ChangeAttributeTransaction>
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Create(dom::Element& aElement,
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nsAtom& aAttribute,
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const nsAString& aValue);
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/**
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* Creates a change attribute transaction to remove an attribute. This
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* method never returns nullptr.
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*
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* @param aElement The element whose attribute will be changed.
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* @param aAttribute The name of the attribute to remove.
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*/
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static already_AddRefed<ChangeAttributeTransaction>
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CreateToRemove(dom::Element& aElement,
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nsAtom& aAttribute);
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NS_DECL_ISUPPORTS_INHERITED
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NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(ChangeAttributeTransaction,
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EditTransactionBase)
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NS_DECL_EDITTRANSACTIONBASE
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NS_IMETHOD RedoTransaction() override;
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private:
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virtual ~ChangeAttributeTransaction();
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// The element to operate upon
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nsCOMPtr<dom::Element> mElement;
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// The attribute to change
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RefPtr<nsAtom> mAttribute;
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// The value to set the attribute to (ignored if mRemoveAttribute==true)
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nsString mValue;
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// The value to set the attribute to for undo
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nsString mUndoValue;
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// True if the operation is to remove mAttribute from mElement
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bool mRemoveAttribute;
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// True if the mAttribute was set on mElement at the time of execution
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bool mAttributeWasSet;
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};
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} // namespace mozilla
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#endif // #ifndef ChangeAttributeTransaction_h
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