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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 <QtCore/QObject>
#include <QtCore/QRectF>
#include <QtCore/QVariant>
#include <QtCore/QVariantAnimation>
#include <WebCore/ViewportArguments.h>
#include <wtf/OwnPtr.h>
QT_BEGIN_NAMESPACE
class QPointF;
class QQuickWebPage;
class QQuickWebView;
class QWheelEvent;
QT_END_NAMESPACE
class QWebKitTest;
namespace WebKit {
class ViewportUpdateDeferrer;
class QtViewportInteractionEngine : public QObject {
Q_OBJECT
public:
QtViewportInteractionEngine(QQuickWebView*, QQuickWebPage*);
~QtViewportInteractionEngine();
void reset();
bool hadUserInteraction() const { return m_hadUserInteraction; }
void setCSSScaleBounds(qreal minimum, qreal maximum);
void setCSSScale(qreal);
qreal currentCSSScale() const;
void setAllowsUserScaling(bool allow) { m_allowsUserScaling = allow; }
void setDevicePixelRatio(qreal ratio) { m_devicePixelRatio = ratio; }
void setPageItemRectVisible(const QRectF&);
void animatePageItemRectVisible(const QRectF&);
QRectF nearestValidBounds() const;
void pageContentPositionRequest(const QPoint& pos);
void touchBegin();
void touchEnd();
bool scrollAnimationActive() const;
void cancelScrollAnimation();
bool panGestureActive() const;
void panGestureStarted(const QPointF& position, qint64 eventTimestampMillis);
void panGestureRequestUpdate(const QPointF& position, qint64 eventTimestampMillis);
void panGestureEnded(const QPointF& position, qint64 eventTimestampMillis);
void panGestureCancelled();
bool scaleAnimationActive() const;
void interruptScaleAnimation();
bool pinchGestureActive() const;
void pinchGestureStarted(const QPointF& pinchCenterInViewportCoordinates);
void pinchGestureRequestUpdate(const QPointF& pinchCenterInViewportCoordinates, qreal totalScaleFactor);
void pinchGestureEnded();
void pinchGestureCancelled();
void zoomToAreaGestureEnded(const QPointF& touchPoint, const QRectF& targetArea);
void focusEditableArea(const QRectF& caretArea, const QRectF& targetArea);
void viewportAttributesChanged(const WebCore::ViewportAttributes&);
void pageContentsSizeChanged(const QSize& newSize, const QSize& viewportSize);
Q_SIGNALS:
void contentSuspendRequested();
void contentResumeRequested();
void informVisibleContentChange(const QPointF& trajectory = QPointF());
private Q_SLOTS:
// Respond to changes of content that are not driven by us, like the page resizing itself.
void pageItemSizeChanged();
void pageItemPositionChanged();
void scaleAnimationStateChanged(QAbstractAnimation::State, QAbstractAnimation::State);
void scaleAnimationValueChanged(QVariant value);
void flickMoveStarted(); // Called when panning starts.
void flickMoveEnded(); // Called when panning (+ kinetic animation) ends.
private:
friend class ViewportUpdateDeferrer;
friend class ::QWebKitTest;
QQuickWebView* const m_viewportItem;
QQuickWebPage* const m_pageItem;
qreal cssScaleFromItem(qreal) const;
qreal itemScaleFromCSS(qreal) const;
qreal itemCoordFromCSS(qreal) const;
QRectF itemRectFromCSS(const QRectF&) const;
qreal innerBoundedCSSScale(qreal) const;
qreal outerBoundedCSSScale(qreal) const;
QRectF computePosRangeForPageItemAtScale(qreal itemScale) const;
void scaleContent(const QPointF& centerInCSSCoordinates, qreal cssScale);
WebCore::ViewportAttributes m_rawAttributes;
bool m_allowsUserScaling;
qreal m_minimumScale;
qreal m_maximumScale;
qreal m_devicePixelRatio;
QSize m_layoutSize;
int m_suspendCount;
bool m_hasSuspendedContent;
OwnPtr<ViewportUpdateDeferrer> m_scaleUpdateDeferrer;
OwnPtr<ViewportUpdateDeferrer> m_scrollUpdateDeferrer;
OwnPtr<ViewportUpdateDeferrer> m_touchUpdateDeferrer;
OwnPtr<ViewportUpdateDeferrer> m_animationUpdateDeferrer;
bool m_hadUserInteraction;
class ScaleAnimation : public QVariantAnimation {
public:
ScaleAnimation(QObject* parent = 0)
: QVariantAnimation(parent)
{ }
virtual void updateCurrentValue(const QVariant&) { }
};
struct ScaleStackItem {
ScaleStackItem(qreal scale, qreal xPosition)
: scale(scale)
, xPosition(xPosition)
{ }
qreal scale;
qreal xPosition;
};
ScaleAnimation* m_scaleAnimation;
QPointF m_lastPinchCenterInViewportCoordinates;
QPointF m_lastScrollPosition;
qreal m_pinchStartScale;
qreal m_zoomOutScale;
QList<ScaleStackItem> m_scaleStack;
};
} // namespace WebKit
#endif // QtViewportInteractionEngine_h
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