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-rw-r--r--layout/forms/ListMutationObserver.cpp92
1 files changed, 92 insertions, 0 deletions
diff --git a/layout/forms/ListMutationObserver.cpp b/layout/forms/ListMutationObserver.cpp
new file mode 100644
index 0000000000..13f9e367a0
--- /dev/null
+++ b/layout/forms/ListMutationObserver.cpp
@@ -0,0 +1,92 @@
+/* -*- 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/. */
+#include "ListMutationObserver.h"
+
+#include "mozilla/dom/HTMLInputElement.h"
+#include "nsIFrame.h"
+
+namespace mozilla {
+NS_IMPL_ISUPPORTS(ListMutationObserver, nsIMutationObserver)
+
+ListMutationObserver::~ListMutationObserver() = default;
+
+void ListMutationObserver::Attach(bool aRepaint) {
+ nsAutoString id;
+ if (InputElement().GetAttr(nsGkAtoms::list_, id)) {
+ Unlink();
+ RefPtr<nsAtom> idAtom = NS_AtomizeMainThread(id);
+ ResetWithID(InputElement(), idAtom);
+ AddObserverIfNeeded();
+ }
+ if (aRepaint) {
+ mOwningElementFrame->InvalidateFrame();
+ }
+}
+
+void ListMutationObserver::AddObserverIfNeeded() {
+ if (auto* list = get()) {
+ if (list->IsHTMLElement(nsGkAtoms::datalist)) {
+ list->AddMutationObserver(this);
+ }
+ }
+}
+
+void ListMutationObserver::RemoveObserverIfNeeded(dom::Element* aList) {
+ if (aList && aList->IsHTMLElement(nsGkAtoms::datalist)) {
+ aList->RemoveMutationObserver(this);
+ }
+}
+
+void ListMutationObserver::Detach() {
+ RemoveObserverIfNeeded();
+ Unlink();
+}
+
+dom::HTMLInputElement& ListMutationObserver::InputElement() const {
+ MOZ_ASSERT(mOwningElementFrame->GetContent()->IsHTMLElement(nsGkAtoms::input),
+ "bad cast");
+ return *static_cast<dom::HTMLInputElement*>(
+ mOwningElementFrame->GetContent());
+}
+
+void ListMutationObserver::AttributeChanged(dom::Element* aElement,
+ int32_t aNameSpaceID,
+ nsAtom* aAttribute,
+ int32_t aModType,
+ const nsAttrValue* aOldValue) {
+ if (aAttribute == nsGkAtoms::value && aNameSpaceID == kNameSpaceID_None &&
+ aElement->IsHTMLElement(nsGkAtoms::option)) {
+ mOwningElementFrame->InvalidateFrame();
+ }
+}
+
+void ListMutationObserver::CharacterDataChanged(
+ nsIContent* aContent, const CharacterDataChangeInfo& aInfo) {
+ mOwningElementFrame->InvalidateFrame();
+}
+
+void ListMutationObserver::ContentAppended(nsIContent* aFirstNewContent) {
+ mOwningElementFrame->InvalidateFrame();
+}
+
+void ListMutationObserver::ContentInserted(nsIContent* aChild) {
+ mOwningElementFrame->InvalidateFrame();
+}
+
+void ListMutationObserver::ContentRemoved(nsIContent* aChild,
+ nsIContent* aPreviousSibling) {
+ mOwningElementFrame->InvalidateFrame();
+}
+
+void ListMutationObserver::ElementChanged(dom::Element* aFrom,
+ dom::Element* aTo) {
+ IDTracker::ElementChanged(aFrom, aTo);
+ RemoveObserverIfNeeded(aFrom);
+ AddObserverIfNeeded();
+ mOwningElementFrame->InvalidateFrame();
+}
+
+} // namespace mozilla