From cad810f21b803229eb11403f9209855525a25d57 Mon Sep 17 00:00:00 2001
From: Steve Block <steveblock@google.com>
Date: Fri, 6 May 2011 11:45:16 +0100
Subject: Merge WebKit at r75315: Initial merge by git.

Change-Id: I570314b346ce101c935ed22a626b48c2af266b84
---
 Source/WebCore/css/MediaQueryMatcher.cpp | 156 +++++++++++++++++++++++++++++++
 1 file changed, 156 insertions(+)
 create mode 100644 Source/WebCore/css/MediaQueryMatcher.cpp

(limited to 'Source/WebCore/css/MediaQueryMatcher.cpp')

diff --git a/Source/WebCore/css/MediaQueryMatcher.cpp b/Source/WebCore/css/MediaQueryMatcher.cpp
new file mode 100644
index 0000000..e076837
--- /dev/null
+++ b/Source/WebCore/css/MediaQueryMatcher.cpp
@@ -0,0 +1,156 @@
+/*
+ * 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.
+ */
+
+#include "config.h"
+#include "MediaQueryMatcher.h"
+
+#include "CSSStyleSelector.h"
+#include "Document.h"
+#include "Element.h"
+#include "FrameView.h"
+#include "MediaList.h"
+#include "MediaQueryEvaluator.h"
+#include "MediaQueryList.h"
+#include "MediaQueryListListener.h"
+
+namespace WebCore {
+
+MediaQueryMatcher::Listener::Listener(PassRefPtr<MediaQueryListListener> listener, PassRefPtr<MediaQueryList> query)
+    : m_listener(listener)
+    , m_query(query)
+{
+}
+
+MediaQueryMatcher::Listener::~Listener()
+{
+}
+
+void MediaQueryMatcher::Listener::evaluate(ScriptState* state, MediaQueryEvaluator* evaluator)
+{
+    bool notify;
+    m_query->evaluate(evaluator, notify);
+    if (notify)
+        m_listener->queryChanged(state, m_query.get());
+}
+
+MediaQueryMatcher::MediaQueryMatcher(Document* document)
+    : m_document(document)
+    , m_evaluationRound(1)
+{
+    ASSERT(m_document);
+}
+
+MediaQueryMatcher::~MediaQueryMatcher()
+{
+}
+
+void MediaQueryMatcher::documentDestroyed()
+{
+    m_listeners.clear();
+    m_document = 0;
+}
+
+String MediaQueryMatcher::mediaType() const
+{
+    if (!m_document || !m_document->frame() || !m_document->frame()->view())
+        return String();
+
+    return m_document->frame()->view()->mediaType();
+}
+
+PassOwnPtr<MediaQueryEvaluator> MediaQueryMatcher::prepareEvaluator() const
+{
+    if (!m_document || !m_document->frame())
+        return 0;
+
+    Element* documentElement = m_document->documentElement();
+    if (!documentElement)
+        return 0;
+
+    CSSStyleSelector* styleSelector = m_document->styleSelector();
+    if (!styleSelector)
+        return 0;
+
+    RefPtr<RenderStyle> rootStyle = styleSelector->styleForElement(documentElement, 0 /*defaultParent*/, false /*allowSharing*/, true /*resolveForRootDefault*/);
+
+    return adoptPtr(new MediaQueryEvaluator(mediaType(), m_document->frame(), rootStyle.get()));
+}
+
+bool MediaQueryMatcher::evaluate(MediaList* media)
+{
+    if (!media)
+        return false;
+
+    OwnPtr<MediaQueryEvaluator> evaluator(prepareEvaluator());
+    return evaluator && evaluator->eval(media);
+}
+
+PassRefPtr<MediaQueryList> MediaQueryMatcher::matchMedia(const String& query)
+{
+    if (!m_document)
+        return 0;
+
+    RefPtr<MediaList> media = MediaList::create(query, false);
+    return MediaQueryList::create(this, media, evaluate(media.get()));
+}
+
+void MediaQueryMatcher::addListener(PassRefPtr<MediaQueryListListener> listener, PassRefPtr<MediaQueryList> query)
+{
+    if (!m_document)
+        return;
+
+    for (size_t i = 0; i < m_listeners.size(); ++i) {
+        if (*m_listeners[i]->listener() == *listener && m_listeners[i]->query() == query)
+            return;
+    }
+
+    m_listeners.append(new Listener(listener, query));
+}
+
+void MediaQueryMatcher::removeListener(MediaQueryListListener* listener, MediaQueryList* query)
+{
+    if (!m_document)
+        return;
+
+    for (size_t i = 0; i < m_listeners.size(); ++i) {
+        if (*m_listeners[i]->listener() == *listener && m_listeners[i]->query() == query) {
+            m_listeners.remove(i);
+            return;
+        }
+    }
+}
+
+void MediaQueryMatcher::styleSelectorChanged()
+{
+    ASSERT(m_document);
+
+    ScriptState* scriptState = mainWorldScriptState(m_document->frame());
+    if (!scriptState)
+        return;
+
+    ++m_evaluationRound;
+    OwnPtr<MediaQueryEvaluator> evaluator = prepareEvaluator();
+    if (!evaluator)
+        return;
+
+    for (size_t i = 0; i < m_listeners.size(); ++i)
+        m_listeners[i]->evaluate(scriptState, evaluator.get());
+}
+
+}
-- 
cgit v1.1