tor-browser

The Tor Browser
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ListMutationObserver.cpp (3086B)

      1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
      2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
      3 /* This Source Code Form is subject to the terms of the Mozilla Public
      4 * License, v. 2.0. If a copy of the MPL was not distributed with this
      5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      6 #include "ListMutationObserver.h"
      7 
      8 #include "mozilla/dom/HTMLInputElement.h"
      9 #include "nsIFrame.h"
     10 
     11 namespace mozilla {
     12 NS_IMPL_ISUPPORTS(ListMutationObserver, nsIMutationObserver)
     13 
     14 ListMutationObserver::~ListMutationObserver() = default;
     15 
     16 void ListMutationObserver::Attach(bool aRepaint) {
     17  nsAutoString id;
     18  if (InputElement().GetAttr(nsGkAtoms::list, id)) {
     19    Unlink();
     20    RefPtr<nsAtom> idAtom = NS_AtomizeMainThread(id);
     21    ResetToID(InputElement(), idAtom);
     22    AddObserverIfNeeded();
     23  }
     24  if (aRepaint) {
     25    mOwningElementFrame->InvalidateFrame();
     26  }
     27 }
     28 
     29 void ListMutationObserver::AddObserverIfNeeded() {
     30  if (auto* list = get()) {
     31    if (list->IsHTMLElement(nsGkAtoms::datalist)) {
     32      list->AddMutationObserver(this);
     33    }
     34  }
     35 }
     36 
     37 void ListMutationObserver::RemoveObserverIfNeeded(dom::Element* aList) {
     38  if (aList && aList->IsHTMLElement(nsGkAtoms::datalist)) {
     39    aList->RemoveMutationObserver(this);
     40  }
     41 }
     42 
     43 void ListMutationObserver::Detach() {
     44  RemoveObserverIfNeeded();
     45  Unlink();
     46 }
     47 
     48 dom::HTMLInputElement& ListMutationObserver::InputElement() const {
     49  MOZ_ASSERT(mOwningElementFrame->GetContent()->IsHTMLElement(nsGkAtoms::input),
     50             "bad cast");
     51  return *static_cast<dom::HTMLInputElement*>(
     52      mOwningElementFrame->GetContent());
     53 }
     54 
     55 void ListMutationObserver::AttributeChanged(dom::Element* aElement,
     56                                            int32_t aNameSpaceID,
     57                                            nsAtom* aAttribute, AttrModType,
     58                                            const nsAttrValue* aOldValue) {
     59  if (aAttribute == nsGkAtoms::value && aNameSpaceID == kNameSpaceID_None &&
     60      aElement->IsHTMLElement(nsGkAtoms::option)) {
     61    mOwningElementFrame->InvalidateFrame();
     62  }
     63 }
     64 
     65 void ListMutationObserver::CharacterDataChanged(
     66    nsIContent* aContent, const CharacterDataChangeInfo& aInfo) {
     67  mOwningElementFrame->InvalidateFrame();
     68 }
     69 
     70 void ListMutationObserver::ContentAppended(nsIContent* aFirstNewContent,
     71                                           const ContentAppendInfo&) {
     72  mOwningElementFrame->InvalidateFrame();
     73 }
     74 
     75 void ListMutationObserver::ContentInserted(nsIContent* aChild,
     76                                           const ContentInsertInfo&) {
     77  mOwningElementFrame->InvalidateFrame();
     78 }
     79 
     80 void ListMutationObserver::ContentWillBeRemoved(nsIContent* aChild,
     81                                                const ContentRemoveInfo&) {
     82  mOwningElementFrame->InvalidateFrame();
     83 }
     84 
     85 void ListMutationObserver::ElementChanged(dom::Element* aFrom,
     86                                          dom::Element* aTo) {
     87  IDTracker::ElementChanged(aFrom, aTo);
     88  RemoveObserverIfNeeded(aFrom);
     89  AddObserverIfNeeded();
     90  mOwningElementFrame->InvalidateFrame();
     91 }
     92 
     93 }  // namespace mozilla