Merge WebKit at r75315: Initial merge by git.

Change-Id: I570314b346ce101c935ed22a626b48c2af266b84

1 files changed, 87 insertions, 0 deletions

diff --git a/Source/WebCore/css/MediaQueryMatcher.h b/Source/WebCore/css/MediaQueryMatcher.h
new file mode 100644
index 0000000..96bbf83
--- /dev/null
+++ b/Source/WebCore/css/MediaQueryMatcher.h
@@ -0,0 +1,87 @@
+/*
+ * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Library General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Library General Public License
+ *  along with this library; see the file COPYING.LIB.  If not, write to
+ *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ *  Boston, MA 02110-1301, USA.
+ */
+
+#ifndef MediaQueryMatcher_h
+#define MediaQueryMatcher_h
+
+#include "ScriptState.h"
+#include <wtf/Forward.h>
+#include <wtf/RefCounted.h>
+#include <wtf/Vector.h>
+
+namespace WebCore {
+
+class Document;
+class MediaList;
+class MediaQueryList;
+class MediaQueryListListener;
+class MediaQueryEvaluator;
+
+// MediaQueryMatcher class is responsible for keeping a vector of pairs
+// MediaQueryList x MediaQueryListListener. It is responsible for evaluating the queries
+// whenever it is needed and to call the listeners if the corresponding query has changed.
+// The listeners must be called in the very same order in which they have been added.
+
+class MediaQueryMatcher : public RefCounted<MediaQueryMatcher> {
+public:
+    static PassRefPtr<MediaQueryMatcher> create(Document* document) { return adoptRef(new MediaQueryMatcher(document)); }
+    ~MediaQueryMatcher();
+    void documentDestroyed();
+
+    void addListener(PassRefPtr<MediaQueryListListener>, PassRefPtr<MediaQueryList>);
+    void removeListener(MediaQueryListListener*, MediaQueryList*);
+
+    PassRefPtr<MediaQueryList> matchMedia(const String&);
+
+    unsigned evaluationRound() const { return m_evaluationRound; }
+    void styleSelectorChanged();
+    bool evaluate(MediaList*);
+
+private:
+    class Listener {
+    public:
+        Listener(PassRefPtr<MediaQueryListListener>, PassRefPtr<MediaQueryList>);
+        ~Listener();
+
+        void evaluate(ScriptState*, MediaQueryEvaluator*);
+
+        MediaQueryListListener* listener() { return m_listener.get(); }
+        MediaQueryList* query() { return m_query.get(); }
+
+    private:
+        RefPtr<MediaQueryListListener> m_listener;
+        RefPtr<MediaQueryList> m_query;
+    };
+
+    MediaQueryMatcher(Document*);
+    PassOwnPtr<MediaQueryEvaluator> prepareEvaluator() const;
+    String mediaType() const;
+
+    Document* m_document;
+    Vector<OwnPtr<Listener> > m_listeners;
+
+    // This value is incremented at style selector changes.
+    // It is used to avoid evaluating queries more then once and to make sure
+    // that a media query result change is notified exactly once.
+    unsigned m_evaluationRound;
+};
+
+}
+
+#endif // MediaQueryMatcher_h