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/*
* Copyright (C) 2013 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef CSSSelectorWatch_h
#define CSSSelectorWatch_h
#include "core/CoreExport.h"
#include "core/css/StyleRule.h"
#include "core/dom/Document.h"
#include "platform/Timer.h"
#include "wtf/HashCountedSet.h"
#include "wtf/HashSet.h"
#include "wtf/Vector.h"
#include "wtf/text/WTFString.h"
namespace blink {
class CORE_EXPORT CSSSelectorWatch final
: public GarbageCollectedFinalized<CSSSelectorWatch>,
public Supplement<Document> {
USING_GARBAGE_COLLECTED_MIXIN(CSSSelectorWatch);
public:
virtual ~CSSSelectorWatch() {}
static CSSSelectorWatch& from(Document&);
static CSSSelectorWatch* fromIfExists(Document&);
void watchCSSSelectors(const Vector<String>& selectors);
const HeapVector<Member<StyleRule>>& watchedCallbackSelectors() const {
return m_watchedCallbackSelectors;
}
void updateSelectorMatches(const Vector<String>& removedSelectors,
const Vector<String>& addedSelectors);
DECLARE_VIRTUAL_TRACE();
private:
explicit CSSSelectorWatch(Document&);
void callbackSelectorChangeTimerFired(TimerBase*);
HeapVector<Member<StyleRule>> m_watchedCallbackSelectors;
// Maps a CSS selector string with a -webkit-callback property to the number
// of matching ComputedStyle objects in this document.
HashCountedSet<String> m_matchingCallbackSelectors;
// Selectors are relative to m_matchingCallbackSelectors's contents at
// the previous call to selectorMatchChanged.
HashSet<String> m_addedSelectors;
HashSet<String> m_removedSelectors;
TaskRunnerTimer<CSSSelectorWatch> m_callbackSelectorChangeTimer;
// When an element is reparented, the new location's style is evaluated after
// the expriation of the relayout timer. We don't want to send redundant
// callbacks to the embedder, so this counter lets us wait another time around
// the event loop.
int m_timerExpirations;
friend class CSSSelectorWatchTest;
};
} // namespace blink
#endif // CSSSelectorWatch_h
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