forked from mirrors/gecko-dev
67 lines
2.1 KiB
C++
67 lines
2.1 KiB
C++
/* -*- 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
|