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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 VTTRegion_h
#define VTTRegion_h
#include "core/dom/ContextLifecycleObserver.h"
#include "core/html/track/TextTrack.h"
#include "platform/Timer.h"
#include "platform/geometry/FloatPoint.h"
#include "platform/heap/Handle.h"
#include "wtf/PassOwnPtr.h"
#include "wtf/RefCounted.h"
namespace WebCore {
class ExceptionState;
class HTMLDivElement;
class VTTCueBox;
class VTTScanner;
class VTTRegion FINAL : public RefCountedWillBeGarbageCollectedFinalized<VTTRegion> {
public:
static PassRefPtrWillBeRawPtr<VTTRegion> create()
{
return adoptRefWillBeNoop(new VTTRegion());
}
virtual ~VTTRegion();
TextTrack* track() const { return m_track; }
void setTrack(TextTrack*);
const String& id() const { return m_id; }
void setId(const String&);
double width() const { return m_width; }
void setWidth(double, ExceptionState&);
long height() const { return m_heightInLines; }
void setHeight(long, ExceptionState&);
double regionAnchorX() const { return m_regionAnchor.x(); }
void setRegionAnchorX(double, ExceptionState&);
double regionAnchorY() const { return m_regionAnchor.y(); }
void setRegionAnchorY(double, ExceptionState&);
double viewportAnchorX() const { return m_viewportAnchor.x(); }
void setViewportAnchorX(double, ExceptionState&);
double viewportAnchorY() const { return m_viewportAnchor.y(); }
void setViewportAnchorY(double, ExceptionState&);
const AtomicString scroll() const;
void setScroll(const AtomicString&, ExceptionState&);
void updateParametersFromRegion(VTTRegion*);
const String& regionSettings() const { return m_settings; }
void setRegionSettings(const String&);
bool isScrollingRegion() { return m_scroll; }
PassRefPtrWillBeRawPtr<HTMLDivElement> getDisplayTree(Document&);
void appendVTTCueBox(PassRefPtrWillBeRawPtr<VTTCueBox>);
void displayLastVTTCueBox();
void willRemoveVTTCueBox(VTTCueBox*);
void trace(Visitor*);
private:
VTTRegion();
void prepareRegionDisplayTree();
// The timer is needed to continue processing when cue scrolling ended.
void startTimer();
void stopTimer();
void scrollTimerFired(Timer<VTTRegion>*);
enum RegionSetting {
None,
Id,
Width,
Height,
RegionAnchor,
ViewportAnchor,
Scroll
};
RegionSetting scanSettingName(VTTScanner&);
void parseSettingValue(RegionSetting, VTTScanner&);
static const AtomicString& textTrackCueContainerShadowPseudoId();
static const AtomicString& textTrackCueContainerScrollingClass();
static const AtomicString& textTrackRegionShadowPseudoId();
String m_id;
String m_settings;
double m_width;
unsigned m_heightInLines;
FloatPoint m_regionAnchor;
FloatPoint m_viewportAnchor;
bool m_scroll;
// The cue container is the container that is scrolled up to obtain the
// effect of scrolling cues when this is enabled for the regions.
RefPtrWillBeMember<HTMLDivElement> m_cueContainer;
RefPtrWillBeMember<HTMLDivElement> m_regionDisplayTree;
// The member variable track can be a raw pointer as it will never
// reference a destroyed TextTrack, as this member variable
// is cleared in the TextTrack destructor and it is generally
// set/reset within the addRegion and removeRegion methods.
RawPtrWillBeMember<TextTrack> m_track;
// Keep track of the current numeric value of the css "top" property.
double m_currentTop;
// The timer is used to display the next cue line after the current one has
// been displayed. It's main use is for scrolling regions and it triggers as
// soon as the animation for rolling out one line has finished, but
// currently it is used also for non-scrolling regions to use a single
// code path.
Timer<VTTRegion> m_scrollTimer;
};
} // namespace WebCore
#endif
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