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/*
* Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies)
* Copyright (C) 2011 Benjamin Poulain <benjamin@webkit.org>
*
* 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 program 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 program; 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 QtViewportInteractionEngine_h
#define QtViewportInteractionEngine_h
#include "OwnPtr.h"
#include <QScroller>
#include "qwebkitglobal.h"
#include <QtCore/QObject>
#include <QtCore/QRectF>
#include <QtCore/QVariant>
#include <QtCore/QVariantAnimation>
QT_BEGIN_NAMESPACE
class QPointF;
class QQuickItem;
class QQuickWebPage;
class QQuickWebView;
class QWheelEvent;
QT_END_NAMESPACE
namespace WebKit {
class ViewportUpdateDeferrer;
class QtViewportInteractionEngine : public QObject {
Q_OBJECT
public:
QtViewportInteractionEngine(const QQuickWebView*, QQuickWebPage*);
~QtViewportInteractionEngine();
struct Constraints {
Constraints()
: initialScale(1.0)
, minimumScale(0.25)
, maximumScale(1.8)
, devicePixelRatio(1.0)
, isUserScalable(true)
, layoutSize(QSize())
{ }
qreal initialScale;
qreal minimumScale;
qreal maximumScale;
qreal devicePixelRatio;
bool isUserScalable;
QSize layoutSize;
};
bool event(QEvent*);
void reset();
void applyConstraints(const Constraints&);
void setItemRectVisible(const QRectF&);
bool animateItemRectVisible(const QRectF&);
void wheelEvent(QWheelEvent*);
void pagePositionRequest(const QPoint& pos);
bool scrollAnimationActive() const;
void interruptScrollAnimation();
bool panGestureActive() const;
void panGestureStarted(const QPointF& viewportTouchPoint, qint64 eventTimestampMillis);
void panGestureRequestUpdate(const QPointF& viewportTouchPoint, qint64 eventTimestampMillis);
void panGestureCancelled();
void panGestureEnded(const QPointF& viewportTouchPoint, qint64 eventTimestampMillis);
bool scaleAnimationActive() const;
void interruptScaleAnimation();
bool pinchGestureActive() const;
void pinchGestureStarted(const QPointF& pinchCenterInViewportCoordinates);
void pinchGestureRequestUpdate(const QPointF& pinchCenterInViewportCoordinates, qreal totalScaleFactor);
void pinchGestureEnded();
void zoomToAreaGestureEnded(const QPointF& touchPoint, const QRectF& targetArea);
void focusEditableArea(const QRectF& caretArea, const QRectF& targetArea);
const Constraints& constraints() const { return m_constraints; }
qreal currentCSSScale();
Q_SIGNALS:
void contentSuspendRequested();
void contentResumeRequested();
void viewportTrajectoryVectorChanged(const QPointF&);
void visibleContentRectAndScaleChanged();
private Q_SLOTS:
// Respond to changes of content that are not driven by us, like the page resizing itself.
void itemSizeChanged();
void scrollStateChanged(QScroller::State);
void scaleAnimationStateChanged(QAbstractAnimation::State, QAbstractAnimation::State);
void scaleAnimationValueChanged(QVariant value) { setItemRectVisible(value.toRectF()); }
private:
friend class ViewportUpdateDeferrer;
qreal cssScaleFromItem(qreal);
qreal itemScaleFromCSS(qreal);
qreal itemCoordFromCSS(qreal);
QRectF itemRectFromCSS(const QRectF&);
qreal innerBoundedCSSScale(qreal);
qreal outerBoundedCSSScale(qreal);
QRectF computePosRangeForItemAtScale(qreal itemScale) const;
bool ensureContentWithinViewportBoundary(bool immediate = false);
void scaleContent(const QPointF& centerInCSSCoordinates, qreal cssScale);
// As long as the object exists this function will always return the same QScroller instance.
QScroller* scroller() { return QScroller::scroller(this); }
const QQuickWebView* const m_viewport;
QQuickWebPage* const m_content;
Constraints m_constraints;
int m_suspendCount;
OwnPtr<ViewportUpdateDeferrer> m_scaleUpdateDeferrer;
OwnPtr<ViewportUpdateDeferrer> m_scrollUpdateDeferrer;
bool m_hadUserInteraction;
class ScaleAnimation : public QVariantAnimation {
public:
ScaleAnimation(QObject* parent = 0)
: QVariantAnimation(parent)
{ }
virtual void updateCurrentValue(const QVariant&) { }
};
ScaleAnimation* m_scaleAnimation;
QPointF m_lastPinchCenterInViewportCoordinates;
qreal m_pinchStartScale;
};
inline bool operator==(const QtViewportInteractionEngine::Constraints& a, const QtViewportInteractionEngine::Constraints& b)
{
return a.initialScale == b.initialScale
&& a.minimumScale == b.minimumScale
&& a.maximumScale == b.maximumScale
&& a.isUserScalable == b.isUserScalable;
}
}
#endif // QtViewportInteractionEngine_h
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