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67 lines
2.1 KiB
C++
67 lines
2.1 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_ListMutationObserver_h
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#define mozilla_ListMutationObserver_h
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#include "IDTracker.h"
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#include "nsStubMutationObserver.h"
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class nsIFrame;
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namespace mozilla {
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namespace dom {
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class HTMLInputElement;
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} // namespace dom
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/**
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* ListMutationObserver
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* This class invalidates paint for the input element's frame when the content
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* of its @list changes, or when the @list ID identifies a different element. It
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* does *not* invalidate paint when the @list attribute itself changes.
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*/
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class ListMutationObserver final : public nsStubMutationObserver,
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public dom::IDTracker {
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public:
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explicit ListMutationObserver(nsIFrame& aOwningElementFrame,
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bool aRepaint = false)
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: mOwningElementFrame(&aOwningElementFrame) {
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// We can skip invalidating paint if the frame is still being initialized.
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Attach(aRepaint);
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}
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NS_DECL_ISUPPORTS
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// We need to invalidate paint when the list or its options change.
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NS_DECL_NSIMUTATIONOBSERVER_ATTRIBUTECHANGED
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NS_DECL_NSIMUTATIONOBSERVER_CHARACTERDATACHANGED
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NS_DECL_NSIMUTATIONOBSERVER_CONTENTAPPENDED
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NS_DECL_NSIMUTATIONOBSERVER_CONTENTINSERTED
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NS_DECL_NSIMUTATIONOBSERVER_CONTENTREMOVED
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/**
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* Triggered when the same @list ID identifies a different element than
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* before.
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*/
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void ElementChanged(dom::Element* aFrom, dom::Element* aTo) override;
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void Attach(bool aRepaint = true);
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void Detach();
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void AddObserverIfNeeded();
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void RemoveObserverIfNeeded(dom::Element* aList);
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void RemoveObserverIfNeeded() { RemoveObserverIfNeeded(get()); }
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dom::HTMLInputElement& InputElement() const;
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private:
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~ListMutationObserver();
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nsIFrame* mOwningElementFrame;
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};
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} // namespace mozilla
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#endif // mozilla_ListMutationObserver_h
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