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/* -*- 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 */
#ifndef ContainStyleScopeManager_h_
#define ContainStyleScopeManager_h_
#include "nsClassHashtable.h"
#include "nsTHashSet.h"
#include "nsQuoteList.h"
#include "nsCounterManager.h"
#include <memory>
class nsIContent;
class nsAtom;
namespace mozilla {
namespace dom {
class Element;
class ContainStyleScopeManager;
/* Implementation of a self-contained `contain: style` scope which manages its
* own counters and quotes. Since the `counters()` function has read access to
* other `contain: style` scopes, USE counter nodes may link across `contain:
* style` scopes. */
class ContainStyleScope final {
ContainStyleScope(ContainStyleScopeManager* aManager,
ContainStyleScope* aParent, nsIContent* aContent)
: mQuoteList(this),
mContent(aContent) {
if (mParent) {
~ContainStyleScope() {
if (mParent) {
nsQuoteList& GetQuoteList() { return mQuoteList; }
nsCounterManager& GetCounterManager() { return mCounterManager; }
ContainStyleScopeManager& GetScopeManager() { return *mScopeManager; }
ContainStyleScope* GetParent() { return mParent; }
nsIContent* GetContent() { return mContent; }
void AddChild(ContainStyleScope* aScope) { mChildren.AppendElement(aScope); }
void RemoveChild(ContainStyleScope* aScope) {
const nsTArray<ContainStyleScope*>& GetChildren() const { return mChildren; }
void RecalcAllCounters();
void RecalcAllQuotes();
// Find the element in the given nsGenConList that directly precedes
// the mContent node of this ContainStyleScope in the flat tree. Can
// return null if no element in the list precedes the content.
nsGenConNode* GetPrecedingElementInGenConList(nsGenConList*);
nsQuoteList mQuoteList;
nsCounterManager mCounterManager;
// We are owned by the |mScopeManager|, so this is guaranteed to be a live
// pointer as long as we are alive as well.
ContainStyleScopeManager* mScopeManager;
// Although parent and child relationships are represented as raw pointers
// here, |mScopeManager| is responsible for managing creation and deletion of
// all these data structures and also that it happens in the correct order.
ContainStyleScope* mParent;
nsTArray<ContainStyleScope*> mChildren;
// |mContent| is guaranteed to outlive this scope because mScopeManager will
// delete the scope when the corresponding frame for |mContent| is destroyed.
nsIContent* mContent;
/* Management of the tree `contain: style` scopes. This class ensures that
* recalculation is done top-down, so that nodes that rely on other nodes in
* ancestor `contain: style` scopes are calculated properly. */
class ContainStyleScopeManager {
ContainStyleScopeManager() : mRootScope(this, nullptr, nullptr) {}
ContainStyleScope& GetRootScope() { return mRootScope; }
ContainStyleScope& GetOrCreateScopeForContent(nsIContent*);
ContainStyleScope& GetScopeForContent(nsIContent*);
void Clear();
// If this frame creates a `contain: style` scope, destroy that scope and
// all of its child scopes.
void DestroyScopesFor(nsIFrame*);
// Destroy this scope and all its children starting from the leaf nodes.
void DestroyScope(ContainStyleScope*);
bool DestroyCounterNodesFor(nsIFrame*);
bool AddCounterChanges(nsIFrame* aNewFrame);
nsCounterList* GetOrCreateCounterList(dom::Element&, nsAtom* aCounterName);
bool CounterDirty(nsAtom* aCounterName);
void SetCounterDirty(nsAtom* aCounterName);
void RecalcAllCounters();
void SetAllCountersDirty();
bool DestroyQuoteNodesFor(nsIFrame*);
nsQuoteList* QuoteListFor(dom::Element&);
void RecalcAllQuotes();
#if defined(DEBUG) || defined(MOZ_LAYOUT_DEBUGGER)
void DumpCounters();
void GetSpokenCounterText(nsIFrame* aFrame, nsAString& aText);
ContainStyleScope mRootScope;
nsClassHashtable<nsPtrHashKey<nsIContent>, ContainStyleScope> mScopes;
nsTHashSet<RefPtr<nsAtom>> mDirtyCounters;
} // namespace mozilla
#endif /* ContainStyleScopeManager_h_ */