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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
#ifndef mozilla_ListMutationObserver_h
#define mozilla_ListMutationObserver_h
#include "IDTracker.h"
#include "nsStubMutationObserver.h"
class nsIFrame;
namespace mozilla {
namespace dom {
class HTMLInputElement;
} // namespace dom
/**
* ListMutationObserver
* This class invalidates paint for the input element's frame when the content
* of its @list changes, or when the @list ID identifies a different element. It
* does *not* invalidate paint when the @list attribute itself changes.
*/
class ListMutationObserver final : public nsStubMutationObserver,
public dom::IDTracker {
public:
explicit ListMutationObserver(nsIFrame& aOwningElementFrame,
bool aRepaint = false)
: mOwningElementFrame(&aOwningElementFrame) {
// We can skip invalidating paint if the frame is still being initialized.
Attach(aRepaint);
}
NS_DECL_ISUPPORTS
// We need to invalidate paint when the list or its options change.
NS_DECL_NSIMUTATIONOBSERVER_ATTRIBUTECHANGED
NS_DECL_NSIMUTATIONOBSERVER_CHARACTERDATACHANGED
NS_DECL_NSIMUTATIONOBSERVER_CONTENTAPPENDED
NS_DECL_NSIMUTATIONOBSERVER_CONTENTINSERTED
NS_DECL_NSIMUTATIONOBSERVER_CONTENTREMOVED
/**
* Triggered when the same @list ID identifies a different element than
* before.
*/
void ElementChanged(dom::Element* aFrom, dom::Element* aTo) override;
void Attach(bool aRepaint = true);
void Detach();
void AddObserverIfNeeded();
void RemoveObserverIfNeeded(dom::Element* aList);
void RemoveObserverIfNeeded() { RemoveObserverIfNeeded(get()); }
dom::HTMLInputElement& InputElement() const;
private:
~ListMutationObserver();
nsIFrame* mOwningElementFrame;
};
} // namespace mozilla
#endif // mozilla_ListMutationObserver_h