layout/forms/ListMutationObserver.cpp

   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     ResetWithID(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,
  58                                             int32_t aModType,
  59                                             const nsAttrValue* aOldValue) {
  60   if (aAttribute == nsGkAtoms::value && aNameSpaceID == kNameSpaceID_None &&
  61       aElement->IsHTMLElement(nsGkAtoms::option)) {
  62     mOwningElementFrame->InvalidateFrame();
  63   }
  64 }
  65
  66 void ListMutationObserver::CharacterDataChanged(
  67     nsIContent* aContent, const CharacterDataChangeInfo& aInfo) {
  68   mOwningElementFrame->InvalidateFrame();
  69 }
  70
  71 void ListMutationObserver::ContentAppended(nsIContent* aFirstNewContent) {
  72   mOwningElementFrame->InvalidateFrame();
  73 }
  74
  75 void ListMutationObserver::ContentInserted(nsIContent* aChild) {
  76   mOwningElementFrame->InvalidateFrame();
  77 }
  78
  79 void ListMutationObserver::ContentRemoved(nsIContent* aChild,
  80                                           nsIContent* aPreviousSibling) {
  81   mOwningElementFrame->InvalidateFrame();
  82 }
  83
  84 void ListMutationObserver::ElementChanged(dom::Element* aFrom,
  85                                           dom::Element* aTo) {
  86   IDTracker::ElementChanged(aFrom, aTo);
  87   RemoveObserverIfNeeded(aFrom);
  88   AddObserverIfNeeded();
  89   mOwningElementFrame->InvalidateFrame();
  90 }
  91
  92 }  // namespace mozilla