From 26a029d407be480d791972afb5975cf62c9360a6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Fri, 19 Apr 2024 02:47:55 +0200 Subject: Adding upstream version 124.0.1. Signed-off-by: Daniel Baumann --- layout/forms/ListMutationObserver.h | 67 +++++++++++++++++++++++++++++++++++++ 1 file changed, 67 insertions(+) create mode 100644 layout/forms/ListMutationObserver.h (limited to 'layout/forms/ListMutationObserver.h') diff --git a/layout/forms/ListMutationObserver.h b/layout/forms/ListMutationObserver.h new file mode 100644 index 0000000000..8c81077fb6 --- /dev/null +++ b/layout/forms/ListMutationObserver.h @@ -0,0 +1,67 @@ +/* -*- 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 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#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 -- cgit v1.2.3