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      1 /*
      2  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
      3  *
      4  *  This library is free software; you can redistribute it and/or
      5  *  modify it under the terms of the GNU Library General Public
      6  *  License as published by the Free Software Foundation; either
      7  *  version 2 of the License, or (at your option) any later version.
      8  *
      9  *  This library is distributed in the hope that it will be useful,
     10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
     11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     12  *  Library General Public License for more details.
     13  *
     14  *  You should have received a copy of the GNU Library General Public License
     15  *  along with this library; see the file COPYING.LIB.  If not, write to
     16  *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     17  *  Boston, MA 02110-1301, USA.
     18  */
     19 
     20 #include "config.h"
     21 #include "core/css/MediaQueryMatcher.h"
     22 
     23 #include "core/css/MediaList.h"
     24 #include "core/css/MediaQueryEvaluator.h"
     25 #include "core/css/MediaQueryList.h"
     26 #include "core/css/MediaQueryListEvent.h"
     27 #include "core/css/MediaQueryListListener.h"
     28 #include "core/css/resolver/StyleResolver.h"
     29 #include "core/dom/Document.h"
     30 #include "core/frame/FrameView.h"
     31 #include "core/frame/LocalFrame.h"
     32 #include "wtf/Vector.h"
     33 
     34 namespace blink {
     35 
     36 PassRefPtrWillBeRawPtr<MediaQueryMatcher> MediaQueryMatcher::create(Document& document)
     37 {
     38     return adoptRefWillBeNoop(new MediaQueryMatcher(document));
     39 }
     40 
     41 MediaQueryMatcher::MediaQueryMatcher(Document& document)
     42     : m_document(&document)
     43 {
     44     ASSERT(m_document);
     45 }
     46 
     47 DEFINE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(MediaQueryMatcher)
     48 
     49 void MediaQueryMatcher::documentDetached()
     50 {
     51     m_document = nullptr;
     52     m_evaluator = nullptr;
     53 }
     54 
     55 PassOwnPtr<MediaQueryEvaluator> MediaQueryMatcher::createEvaluator() const
     56 {
     57     if (!m_document || !m_document->frame())
     58         return nullptr;
     59 
     60     return adoptPtr(new MediaQueryEvaluator(m_document->frame()));
     61 }
     62 
     63 bool MediaQueryMatcher::evaluate(const MediaQuerySet* media)
     64 {
     65     ASSERT(!m_document || m_document->frame() || !m_evaluator);
     66 
     67     if (!media)
     68         return false;
     69 
     70     // Cache the evaluator to avoid allocating one per evaluation.
     71     if (!m_evaluator)
     72         m_evaluator = createEvaluator();
     73 
     74     if (m_evaluator)
     75         return m_evaluator->eval(media);
     76 
     77     return false;
     78 }
     79 
     80 PassRefPtrWillBeRawPtr<MediaQueryList> MediaQueryMatcher::matchMedia(const String& query)
     81 {
     82     if (!m_document)
     83         return nullptr;
     84 
     85     RefPtrWillBeRawPtr<MediaQuerySet> media = MediaQuerySet::create(query);
     86     // Add warning message to inspector whenever dpi/dpcm values are used for "screen" media.
     87     reportMediaQueryWarningIfNeeded(m_document, media.get());
     88     return MediaQueryList::create(m_document, this, media);
     89 }
     90 
     91 void MediaQueryMatcher::addMediaQueryList(MediaQueryList* query)
     92 {
     93     if (!m_document)
     94         return;
     95     m_mediaLists.add(query);
     96 }
     97 
     98 void MediaQueryMatcher::removeMediaQueryList(MediaQueryList* query)
     99 {
    100     if (!m_document)
    101         return;
    102     m_mediaLists.remove(query);
    103 }
    104 
    105 void MediaQueryMatcher::addViewportListener(PassRefPtrWillBeRawPtr<MediaQueryListListener> listener)
    106 {
    107     if (!m_document)
    108         return;
    109     m_viewportListeners.add(listener);
    110 }
    111 
    112 void MediaQueryMatcher::removeViewportListener(PassRefPtrWillBeRawPtr<MediaQueryListListener> listener)
    113 {
    114     if (!m_document)
    115         return;
    116     m_viewportListeners.remove(listener);
    117 }
    118 
    119 void MediaQueryMatcher::mediaFeaturesChanged()
    120 {
    121     if (!m_document)
    122         return;
    123 
    124     WillBeHeapVector<RefPtrWillBeMember<MediaQueryListListener> > listenersToNotify;
    125     for (MediaQueryListSet::iterator it = m_mediaLists.begin(); it != m_mediaLists.end(); ++it) {
    126         if ((*it)->mediaFeaturesChanged(&listenersToNotify)) {
    127             RefPtrWillBeRawPtr<Event> event(MediaQueryListEvent::create(*it));
    128             event->setTarget(*it);
    129             m_document->enqueueUniqueAnimationFrameEvent(event);
    130         }
    131     }
    132     m_document->enqueueMediaQueryChangeListeners(listenersToNotify);
    133 }
    134 
    135 void MediaQueryMatcher::viewportChanged()
    136 {
    137     if (!m_document)
    138         return;
    139 
    140     WillBeHeapVector<RefPtrWillBeMember<MediaQueryListListener> > listenersToNotify;
    141     for (ViewportListenerSet::iterator it = m_viewportListeners.begin(); it != m_viewportListeners.end(); ++it)
    142         listenersToNotify.append(*it);
    143 
    144     m_document->enqueueMediaQueryChangeListeners(listenersToNotify);
    145 }
    146 
    147 void MediaQueryMatcher::trace(Visitor* visitor)
    148 {
    149 #if ENABLE(OILPAN)
    150     visitor->trace(m_document);
    151     visitor->trace(m_mediaLists);
    152     visitor->trace(m_viewportListeners);
    153 #endif
    154 }
    155 
    156 }
    157