third_party/WebKit/Source/core/css/ActiveStyleSheets.h

// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef ActiveStyleSheets_h
#define ActiveStyleSheets_h

#include "core/CoreExport.h"
#include "platform/heap/HeapAllocator.h"

namespace blink {

class CSSStyleSheet;
class RuleSet;

using ActiveStyleSheetVector = HeapVector<std::pair<Member<CSSStyleSheet>, Member<RuleSet>>>;

enum ActiveSheetsChange {
    NoActiveSheetsChanged, // Nothing changed.
    ActiveSheetsChanged, // Sheets were added and/or inserted.
    ActiveSheetsAppended // Only additions, and all appended.
};

CORE_EXPORT ActiveSheetsChange compareActiveStyleSheets(
    const ActiveStyleSheetVector& oldStyleSheets,
    const ActiveStyleSheetVector& newStyleSheets,
    HeapVector<Member<RuleSet>>& changedRuleSets);

} // namespace blink

#endif // ActiveStyleSheets_h