qquickstateoperations.cpp

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#include "qquickstateoperations_p.h"
#include "qquickitem_p.h"
 
#include <private/qquickstate_p_p.h>
 
#include <QtQml/qqmlinfo.h>
 
#include <QtCore/qmath.h>
#include <QtCore/qpointer.h>
 
#include <memory>
 
QT_BEGIN_NAMESPACE
 
class QQuickParentChangePrivate : public QQuickStateOperationPrivate
{
    Q_DECLARE_PUBLIC(QQuickParentChange)
public:
    QQuickItem *target = nullptr;
    QPointer<QQuickItem> parent;
 
    struct StateSnapshot {
        QPointer<QQuickItem> parent;
        QPointer<QQuickItem> stackBefore;
        qreal x = 0, y = 0, width = 0, height = 0, scale = 0, rotation = 0;
    };
 
    std::unique_ptr<StateSnapshot> orig;
    std::unique_ptr<StateSnapshot> rewind;
 
    QQmlNullableValue<QQmlScriptString> xString;
    QQmlNullableValue<QQmlScriptString> yString;
    QQmlNullableValue<QQmlScriptString> widthString;
    QQmlNullableValue<QQmlScriptString> heightString;
    QQmlNullableValue<QQmlScriptString> scaleString;
    QQmlNullableValue<QQmlScriptString> rotationString;
 
    void doChange(QQuickItem *targetParent);
    void reverseRewindHelper(const std::unique_ptr<StateSnapshot> &snapshot);
};
 
void QQuickParentChangePrivate::doChange(QQuickItem *targetParent)
{
    if (targetParent && target && target->parentItem()) {
        Q_Q(QQuickParentChange);
        bool ok;
        const QTransform &transform = target->parentItem()->itemTransform(targetParent, &ok);
        if (transform.type() >= QTransform::TxShear || !ok) {
            qmlWarning(q) << QQuickParentChange::tr("Unable to preserve appearance under complex transform");
            ok = false;
        }
 
        qreal scale = 1;
        qreal rotation = 0;
        bool isRotate = (transform.type() == QTransform::TxRotate) || (transform.m11() < 0);
        if (ok && !isRotate) {
            if (transform.m11() == transform.m22())
                scale = transform.m11();
            else {
                qmlWarning(q) << QQuickParentChange::tr("Unable to preserve appearance under non-uniform scale");
                ok = false;
            }
        } else if (ok && isRotate) {
            if (transform.m11() == transform.m22())
                scale = qSqrt(transform.m11()*transform.m11() + transform.m12()*transform.m12());
            else {
                qmlWarning(q) << QQuickParentChange::tr("Unable to preserve appearance under non-uniform scale");
                ok = false;
            }
 
            if (scale != 0)
                rotation = qRadiansToDegrees(qAtan2(transform.m12() / scale, transform.m11() / scale));
            else {
                qmlWarning(q) << QQuickParentChange::tr("Unable to preserve appearance under scale of 0");
                ok = false;
            }
        }
 
        const QPointF &point = transform.map(QPointF(target->x(),target->y()));
        qreal x = point.x();
        qreal y = point.y();
 
        // setParentItem will update the transformOriginPoint if needed
        target->setParentItem(targetParent);
 
        if (ok && target->transformOrigin() != QQuickItem::TopLeft) {
            qreal tempxt = target->transformOriginPoint().x();
            qreal tempyt = target->transformOriginPoint().y();
            QTransform t;
            t.translate(-tempxt, -tempyt);
            t.rotate(rotation);
            t.scale(scale, scale);
            t.translate(tempxt, tempyt);
            const QPointF &offset = t.map(QPointF(0,0));
            x += offset.x();
            y += offset.y();
        }
 
        if (ok) {
            //qDebug() << x << y << rotation << scale;
            target->setPosition(QPointF(x, y));
            target->setRotation(target->rotation() + rotation);
            target->setScale(target->scale() * scale);
        }
    } else if (target) {
        target->setParentItem(targetParent);
    }
}
 
QQuickParentChange::QQuickParentChange(QObject *parent)
    : QQuickStateOperation(*(new QQuickParentChangePrivate), parent)
{
}
 
QQmlScriptString QQuickParentChange::x() const
{
    Q_D(const QQuickParentChange);
    return d->xString.value();
}
 
void QQuickParentChange::setX(const QQmlScriptString &x)
{
    Q_D(QQuickParentChange);
    d->xString = x;
}
 
bool QQuickParentChange::xIsSet() const
{
    Q_D(const QQuickParentChange);
    return d->xString.isValid();
}
 
QQmlScriptString QQuickParentChange::y() const
{
    Q_D(const QQuickParentChange);
    return d->yString.value();
}
 
void QQuickParentChange::setY(const QQmlScriptString &y)
{
    Q_D(QQuickParentChange);
    d->yString = y;
}
 
bool QQuickParentChange::yIsSet() const
{
    Q_D(const QQuickParentChange);
    return d->yString.isValid();
}
 
QQmlScriptString QQuickParentChange::width() const
{
    Q_D(const QQuickParentChange);
    return d->widthString.value();
}
 
void QQuickParentChange::setWidth(const QQmlScriptString &width)
{
    Q_D(QQuickParentChange);
    d->widthString = width;
}
 
bool QQuickParentChange::widthIsSet() const
{
    Q_D(const QQuickParentChange);
    return d->widthString.isValid();
}
 
QQmlScriptString QQuickParentChange::height() const
{
    Q_D(const QQuickParentChange);
    return d->heightString.value();
}
 
void QQuickParentChange::setHeight(const QQmlScriptString &height)
{
    Q_D(QQuickParentChange);
    d->heightString = height;
}
 
bool QQuickParentChange::heightIsSet() const
{
    Q_D(const QQuickParentChange);
    return d->heightString.isValid();
}
 
QQmlScriptString QQuickParentChange::scale() const
{
    Q_D(const QQuickParentChange);
    return d->scaleString.value();
}
 
void QQuickParentChange::setScale(const QQmlScriptString &scale)
{
    Q_D(QQuickParentChange);
    d->scaleString = scale;
}
 
bool QQuickParentChange::scaleIsSet() const
{
    Q_D(const QQuickParentChange);
    return d->scaleString.isValid();
}
 
QQmlScriptString QQuickParentChange::rotation() const
{
    Q_D(const QQuickParentChange);
    return d->rotationString.value();
}
 
void QQuickParentChange::setRotation(const QQmlScriptString &rotation)
{
    Q_D(QQuickParentChange);
    d->rotationString = rotation;
}
 
bool QQuickParentChange::rotationIsSet() const
{
    Q_D(const QQuickParentChange);
    return d->rotationString.isValid();
}
 
QQuickItem *QQuickParentChange::originalParent() const
{
    Q_D(const QQuickParentChange);
    return d->orig ? d->orig->parent : nullptr;
}
 
QQuickItem *QQuickParentChange::object() const
{
    Q_D(const QQuickParentChange);
    return d->target;
}
 
void QQuickParentChange::setObject(QQuickItem *target)
{
    Q_D(QQuickParentChange);
    d->target = target;
}
 
QQuickItem *QQuickParentChange::parent() const
{
    Q_D(const QQuickParentChange);
    return d->parent;
}
 
void QQuickParentChange::setParent(QQuickItem *parent)
{
    Q_D(QQuickParentChange);
    d->parent = parent;
}
 
QQuickStateOperation::ActionList QQuickParentChange::actions()
{
    Q_D(QQuickParentChange);
    if (!d->target || !d->parent)
        return ActionList();
 
    ActionList actions;
 
    QQuickStateAction a;
    a.event = this;
    actions << a;
 
    if (d->xString.isValid()) {
        bool ok = false;
        qreal x = d->xString.value().numberLiteral(&ok);
        if (ok) {
            QQuickStateAction xa(d->target, QLatin1String("x"), x);
            actions << xa;
        } else {
            QQmlProperty property(d->target, QLatin1String("x"));
            auto newBinding = QQmlAnyBinding::createFromScriptString(
                    property, d->xString.value(), d->target, qmlContext(this));
            QQuickStateAction xa;
            xa.property = property;
            xa.toBinding = newBinding;
            xa.fromValue = xa.property.read();
            xa.deletableToBinding = true;
            actions << xa;
        }
    }
 
    if (d->yString.isValid()) {
        bool ok = false;
        qreal y = d->yString.value().numberLiteral(&ok);
        if (ok) {
            QQuickStateAction ya(d->target, QLatin1String("y"), y);
            actions << ya;
        } else {
            QQmlProperty property(d->target, QLatin1String("y"));
            auto newBinding = QQmlAnyBinding::createFromScriptString(
                    property, d->yString.value(), d->target, qmlContext(this));
            QQuickStateAction ya;
            ya.property = property;
            ya.toBinding = newBinding;
            ya.fromValue = ya.property.read();
            ya.deletableToBinding = true;
            actions << ya;
        }
    }
 
    if (d->scaleString.isValid()) {
        bool ok = false;
        qreal scale = d->scaleString.value().numberLiteral(&ok);
        if (ok) {
            QQuickStateAction sa(d->target, QLatin1String("scale"), scale);
            actions << sa;
        } else {
            QQmlProperty property(d->target, QLatin1String("scale"));
            auto newBinding = QQmlAnyBinding::createFromScriptString(
                    property, d->scaleString.value(), d->target, qmlContext(this));
            QQuickStateAction sa;
            sa.property = property;
            sa.toBinding = newBinding;
            sa.fromValue = sa.property.read();
            sa.deletableToBinding = true;
            actions << sa;
        }
    }
 
    if (d->rotationString.isValid()) {
        bool ok = false;
        qreal rotation = d->rotationString.value().numberLiteral(&ok);
        if (ok) {
            QQuickStateAction ra(d->target, QLatin1String("rotation"), rotation);
            actions << ra;
        } else {
            QQmlProperty property(d->target, QLatin1String("rotation"));
            auto newBinding = QQmlAnyBinding::createFromScriptString(
                    property, d->rotationString.value(), d->target, qmlContext(this));
            QQuickStateAction ra;
            ra.property = property;
            ra.toBinding = newBinding;
            ra.fromValue = ra.property.read();
            ra.deletableToBinding = true;
            actions << ra;
        }
    }
 
    if (d->widthString.isValid()) {
        bool ok = false;
        qreal width = d->widthString.value().numberLiteral(&ok);
        if (ok) {
            QQuickStateAction wa(d->target, QLatin1String("width"), width);
            actions << wa;
        } else {
            QQmlProperty property(d->target, QLatin1String("width"));
            auto newBinding = QQmlAnyBinding::createFromScriptString(property, d->widthString, d->target, qmlContext(this));
            QQuickStateAction wa;
            wa.property = property;
            wa.toBinding = newBinding;
            wa.fromValue = wa.property.read();
            wa.deletableToBinding = true;
            actions << wa;
        }
    }
 
    if (d->heightString.isValid()) {
        bool ok = false;
        qreal height = d->heightString.value().numberLiteral(&ok);
        if (ok) {
            QQuickStateAction ha(d->target, QLatin1String("height"), height);
            actions << ha;
        } else {
            QQmlProperty property(d->target, QLatin1String("height"));
            auto newBinding = QQmlAnyBinding::createFromScriptString(property, d->heightString, d->target, qmlContext(this));
            QQuickStateAction ha;
            ha.property = property;
            ha.toBinding = newBinding;
            ha.fromValue = ha.property.read();
            ha.deletableToBinding = true;
            actions << ha;
        }
    }
 
    return actions;
}
 
void QQuickParentChange::saveOriginals()
{
    Q_D(QQuickParentChange);
    saveCurrentValues();
    if (!d->orig)
        d->orig.reset(new QQuickParentChangePrivate::StateSnapshot);
    *d->orig = *d->rewind;
}
 
void QQuickParentChange::execute()
{
    Q_D(QQuickParentChange);
    d->doChange(d->parent);
}
 
bool QQuickParentChange::isReversable()
{
    return true;
}
 
void QQuickParentChangePrivate::reverseRewindHelper(const std::unique_ptr<QQuickParentChangePrivate::StateSnapshot> &snapshot)
{
    if (!target || !snapshot)
        return;
 
    // leave existing bindings alive; new bindings are applied in applyBindings
    // setPosition and setSize update the geometry without invalidating bindings
    target->setPosition(QPointF(snapshot->x, snapshot->y));
    target->setSize(QSizeF(snapshot->width, snapshot->height));
 
    target->setScale(snapshot->scale);
    target->setRotation(snapshot->rotation);
    target->setParentItem(snapshot->parent);
    if (snapshot->stackBefore)
        target->stackBefore(snapshot->stackBefore);
}
 
 
void QQuickParentChange::reverse()
{
    Q_D(QQuickParentChange);
    d->reverseRewindHelper(d->orig);
}
 
QQuickStateActionEvent::EventType QQuickParentChange::type() const
{
    return ParentChange;
}
 
bool QQuickParentChange::mayOverride(QQuickStateActionEvent*other)
{
    Q_D(QQuickParentChange);
    if (other->type() != ParentChange)
        return false;
    if (QQuickParentChange *otherPC = static_cast<QQuickParentChange*>(other))
        return (d->target == otherPC->object());
    return false;
}
 
void QQuickParentChange::saveCurrentValues()
{
    Q_D(QQuickParentChange);
    if (!d->target) {
        d->rewind = nullptr;
        return;
    }
 
    d->rewind.reset(new QQuickParentChangePrivate::StateSnapshot);
    d->rewind->x = d->target->x();
    d->rewind->y = d->target->y();
    d->rewind->scale = d->target->scale();
    d->rewind->width = d->target->width();
    d->rewind->height = d->target->height();
    d->rewind->rotation = d->target->rotation();
 
    d->rewind->parent = d->target->parentItem();
    d->rewind->stackBefore = nullptr;
 
    if (!d->rewind->parent)
        return;
 
    QList<QQuickItem *> children = d->rewind->parent->childItems();
    for (int ii = 0; ii < children.size() - 1; ++ii) {
        if (children.at(ii) == d->target) {
            d->rewind->stackBefore = children.at(ii + 1);
            break;
        }
    }
}
 
void QQuickParentChange::rewind()
{
    Q_D(QQuickParentChange);
    d->reverseRewindHelper(d->rewind);
    d->rewind.reset();
}
 
class QQuickAnchorSetPrivate : public QObjectPrivate
{
    Q_DECLARE_PUBLIC(QQuickAnchorSet)
public:
    QQuickAnchors::Anchors usedAnchors;
    QQuickAnchors::Anchors resetAnchors;
 
    QQmlScriptString leftScript;
    QQmlScriptString rightScript;
    QQmlScriptString topScript;
    QQmlScriptString bottomScript;
    QQmlScriptString hCenterScript;
    QQmlScriptString vCenterScript;
    QQmlScriptString baselineScript;
};
 
QQuickAnchorSet::QQuickAnchorSet(QObject *parent)
  : QObject(*new QQuickAnchorSetPrivate, parent)
{
}
 
QQuickAnchorSet::~QQuickAnchorSet()
{
}
 
QQmlScriptString QQuickAnchorSet::top() const
{
    Q_D(const QQuickAnchorSet);
    return d->topScript;
}
 
void QQuickAnchorSet::setTop(const QQmlScriptString &edge)
{
    Q_D(QQuickAnchorSet);
    d->usedAnchors |= QQuickAnchors::TopAnchor;
    d->topScript = edge;
    if (edge.isUndefinedLiteral())
        resetTop();
}
 
void QQuickAnchorSet::resetTop()
{
    Q_D(QQuickAnchorSet);
    d->usedAnchors &= ~QQuickAnchors::TopAnchor;
    d->resetAnchors |= QQuickAnchors::TopAnchor;
}
 
QQmlScriptString QQuickAnchorSet::bottom() const
{
    Q_D(const QQuickAnchorSet);
    return d->bottomScript;
}
 
void QQuickAnchorSet::setBottom(const QQmlScriptString &edge)
{
    Q_D(QQuickAnchorSet);
    d->usedAnchors |= QQuickAnchors::BottomAnchor;
    d->bottomScript = edge;
    if (edge.isUndefinedLiteral())
        resetBottom();
}
 
void QQuickAnchorSet::resetBottom()
{
    Q_D(QQuickAnchorSet);
    d->usedAnchors &= ~QQuickAnchors::BottomAnchor;
    d->resetAnchors |= QQuickAnchors::BottomAnchor;
}
 
QQmlScriptString QQuickAnchorSet::verticalCenter() const
{
    Q_D(const QQuickAnchorSet);
    return d->vCenterScript;
}
 
void QQuickAnchorSet::setVerticalCenter(const QQmlScriptString &edge)
{
    Q_D(QQuickAnchorSet);
    d->usedAnchors |= QQuickAnchors::VCenterAnchor;
    d->vCenterScript = edge;
    if (edge.isUndefinedLiteral())
        resetVerticalCenter();
}
 
void QQuickAnchorSet::resetVerticalCenter()
{
    Q_D(QQuickAnchorSet);
    d->usedAnchors &= ~QQuickAnchors::VCenterAnchor;
    d->resetAnchors |= QQuickAnchors::VCenterAnchor;
}
 
QQmlScriptString QQuickAnchorSet::baseline() const
{
    Q_D(const QQuickAnchorSet);
    return d->baselineScript;
}
 
void QQuickAnchorSet::setBaseline(const QQmlScriptString &edge)
{
    Q_D(QQuickAnchorSet);
    d->usedAnchors |= QQuickAnchors::BaselineAnchor;
    d->baselineScript = edge;
    if (edge.isUndefinedLiteral())
        resetBaseline();
}
 
void QQuickAnchorSet::resetBaseline()
{
    Q_D(QQuickAnchorSet);
    d->usedAnchors &= ~QQuickAnchors::BaselineAnchor;
    d->resetAnchors |= QQuickAnchors::BaselineAnchor;
}
 
QQmlScriptString QQuickAnchorSet::left() const
{
    Q_D(const QQuickAnchorSet);
    return d->leftScript;
}
 
void QQuickAnchorSet::setLeft(const QQmlScriptString &edge)
{
    Q_D(QQuickAnchorSet);
    d->usedAnchors |= QQuickAnchors::LeftAnchor;
    d->leftScript = edge;
    if (edge.isUndefinedLiteral())
        resetLeft();
}
 
void QQuickAnchorSet::resetLeft()
{
    Q_D(QQuickAnchorSet);
    d->usedAnchors &= ~QQuickAnchors::LeftAnchor;
    d->resetAnchors |= QQuickAnchors::LeftAnchor;
}
 
QQmlScriptString QQuickAnchorSet::right() const
{
    Q_D(const QQuickAnchorSet);
    return d->rightScript;
}
 
void QQuickAnchorSet::setRight(const QQmlScriptString &edge)
{
    Q_D(QQuickAnchorSet);
    d->usedAnchors |= QQuickAnchors::RightAnchor;
    d->rightScript = edge;
    if (edge.isUndefinedLiteral())
        resetRight();
}
 
void QQuickAnchorSet::resetRight()
{
    Q_D(QQuickAnchorSet);
    d->usedAnchors &= ~QQuickAnchors::RightAnchor;
    d->resetAnchors |= QQuickAnchors::RightAnchor;
}
 
QQmlScriptString QQuickAnchorSet::horizontalCenter() const
{
    Q_D(const QQuickAnchorSet);
    return d->hCenterScript;
}
 
void QQuickAnchorSet::setHorizontalCenter(const QQmlScriptString &edge)
{
    Q_D(QQuickAnchorSet);
    d->usedAnchors |= QQuickAnchors::HCenterAnchor;
    d->hCenterScript = edge;
    if (edge.isUndefinedLiteral())
        resetHorizontalCenter();
}
 
void QQuickAnchorSet::resetHorizontalCenter()
{
    Q_D(QQuickAnchorSet);
    d->usedAnchors &= ~QQuickAnchors::HCenterAnchor;
    d->resetAnchors |= QQuickAnchors::HCenterAnchor;
}
 
class QQuickAnchorChangesPrivate : public QQuickStateOperationPrivate
{
public:
    QQuickAnchorChangesPrivate()
        : target(nullptr), anchorSet(new QQuickAnchorSet)
    {
 
    }
    ~QQuickAnchorChangesPrivate() { delete anchorSet; }
 
    QQuickItem *target;
    QQuickAnchorSet *anchorSet;
 
    QQmlBinding::Ptr leftBinding;
    QQmlBinding::Ptr rightBinding;
    QQmlBinding::Ptr hCenterBinding;
    QQmlBinding::Ptr topBinding;
    QQmlBinding::Ptr bottomBinding;
    QQmlBinding::Ptr vCenterBinding;
    QQmlBinding::Ptr baselineBinding;
 
    QQmlAbstractBinding::Ptr origLeftBinding;
    QQmlAbstractBinding::Ptr origRightBinding;
    QQmlAbstractBinding::Ptr origHCenterBinding;
    QQmlAbstractBinding::Ptr origTopBinding;
    QQmlAbstractBinding::Ptr origBottomBinding;
    QQmlAbstractBinding::Ptr origVCenterBinding;
    QQmlAbstractBinding::Ptr origBaselineBinding;
 
    QQuickAnchorLine rewindLeft;
    QQuickAnchorLine rewindRight;
    QQuickAnchorLine rewindHCenter;
    QQuickAnchorLine rewindTop;
    QQuickAnchorLine rewindBottom;
    QQuickAnchorLine rewindVCenter;
    QQuickAnchorLine rewindBaseline;
 
    qreal fromX;
    qreal fromY;
    qreal fromWidth;
    qreal fromHeight;
 
    qreal toX;
    qreal toY;
    qreal toWidth;
    qreal toHeight;
 
    qreal rewindX;
    qreal rewindY;
    qreal rewindWidth;
    qreal rewindHeight;
 
    bool applyOrigLeft;
    bool applyOrigRight;
    bool applyOrigHCenter;
    bool applyOrigTop;
    bool applyOrigBottom;
    bool applyOrigVCenter;
    bool applyOrigBaseline;
 
    QQmlNullableValue<qreal> origWidth;
    QQmlNullableValue<qreal> origHeight;
    qreal origX;
    qreal origY;
 
    QQmlProperty leftProp;
    QQmlProperty rightProp;
    QQmlProperty hCenterProp;
    QQmlProperty topProp;
    QQmlProperty bottomProp;
    QQmlProperty vCenterProp;
    QQmlProperty baselineProp;
};
 
QQuickAnchorChanges::QQuickAnchorChanges(QObject *parent)
 : QQuickStateOperation(*(new QQuickAnchorChangesPrivate), parent)
{
}
 
QQuickAnchorChanges::ActionList QQuickAnchorChanges::actions()
{
    Q_D(QQuickAnchorChanges);
    //### ASSERT these are all 0?
    d->leftBinding = d->rightBinding = d->hCenterBinding = d->topBinding
                   = d->bottomBinding = d->vCenterBinding = d->baselineBinding = nullptr;
 
    d->leftProp = QQmlProperty(d->target, QLatin1String("anchors.left"));
    d->rightProp = QQmlProperty(d->target, QLatin1String("anchors.right"));
    d->hCenterProp = QQmlProperty(d->target, QLatin1String("anchors.horizontalCenter"));
    d->topProp = QQmlProperty(d->target, QLatin1String("anchors.top"));
    d->bottomProp = QQmlProperty(d->target, QLatin1String("anchors.bottom"));
    d->vCenterProp = QQmlProperty(d->target, QLatin1String("anchors.verticalCenter"));
    d->baselineProp = QQmlProperty(d->target, QLatin1String("anchors.baseline"));
 
    if (d->anchorSet->d_func()->usedAnchors & QQuickAnchors::LeftAnchor) {
        d->leftBinding = QQmlBinding::create(&QQmlPropertyPrivate::get(d->leftProp)->core, d->anchorSet->d_func()->leftScript, d->target, qmlContext(this));
        d->leftBinding->setTarget(d->leftProp);
    }
    if (d->anchorSet->d_func()->usedAnchors & QQuickAnchors::RightAnchor) {
        d->rightBinding = QQmlBinding::create(&QQmlPropertyPrivate::get(d->rightProp)->core, d->anchorSet->d_func()->rightScript, d->target, qmlContext(this));
        d->rightBinding->setTarget(d->rightProp);
    }
    if (d->anchorSet->d_func()->usedAnchors & QQuickAnchors::HCenterAnchor) {
        d->hCenterBinding = QQmlBinding::create(&QQmlPropertyPrivate::get(d->hCenterProp)->core, d->anchorSet->d_func()->hCenterScript, d->target, qmlContext(this));
        d->hCenterBinding->setTarget(d->hCenterProp);
    }
    if (d->anchorSet->d_func()->usedAnchors & QQuickAnchors::TopAnchor) {
        d->topBinding = QQmlBinding::create(&QQmlPropertyPrivate::get(d->topProp)->core, d->anchorSet->d_func()->topScript, d->target, qmlContext(this));
        d->topBinding->setTarget(d->topProp);
    }
    if (d->anchorSet->d_func()->usedAnchors & QQuickAnchors::BottomAnchor) {
        d->bottomBinding = QQmlBinding::create(&QQmlPropertyPrivate::get(d->bottomProp)->core, d->anchorSet->d_func()->bottomScript, d->target, qmlContext(this));
        d->bottomBinding->setTarget(d->bottomProp);
    }
    if (d->anchorSet->d_func()->usedAnchors & QQuickAnchors::VCenterAnchor) {
        d->vCenterBinding = QQmlBinding::create(&QQmlPropertyPrivate::get(d->vCenterProp)->core, d->anchorSet->d_func()->vCenterScript, d->target, qmlContext(this));
        d->vCenterBinding->setTarget(d->vCenterProp);
    }
    if (d->anchorSet->d_func()->usedAnchors & QQuickAnchors::BaselineAnchor) {
        d->baselineBinding = QQmlBinding::create(&QQmlPropertyPrivate::get(d->baselineProp)->core, d->anchorSet->d_func()->baselineScript, d->target, qmlContext(this));
        d->baselineBinding->setTarget(d->baselineProp);
    }
 
    QQuickStateAction a;
    a.event = this;
    return ActionList() << a;
}
 
QQuickAnchorSet *QQuickAnchorChanges::anchors() const
{
    Q_D(const QQuickAnchorChanges);
    return d->anchorSet;
}
 
QQuickItem *QQuickAnchorChanges::object() const
{
    Q_D(const QQuickAnchorChanges);
    return d->target;
}
 
void QQuickAnchorChanges::setObject(QQuickItem *target)
{
    Q_D(QQuickAnchorChanges);
    d->target = target;
}
 
void QQuickAnchorChanges::execute()
{
    Q_D(QQuickAnchorChanges);
    if (!d->target)
        return;
 
    QQuickItemPrivate *targetPrivate = QQuickItemPrivate::get(d->target);
    //incorporate any needed "reverts"
    if (d->applyOrigLeft) {
        if (!d->origLeftBinding)
            targetPrivate->anchors()->resetLeft();
        QQmlPropertyPrivate::setBinding(d->leftProp, d->origLeftBinding.data());
    }
    if (d->applyOrigRight) {
        if (!d->origRightBinding)
            targetPrivate->anchors()->resetRight();
        QQmlPropertyPrivate::setBinding(d->rightProp, d->origRightBinding.data());
    }
    if (d->applyOrigHCenter) {
        if (!d->origHCenterBinding)
            targetPrivate->anchors()->resetHorizontalCenter();
        QQmlPropertyPrivate::setBinding(d->hCenterProp, d->origHCenterBinding.data());
    }
    if (d->applyOrigTop) {
        if (!d->origTopBinding)
            targetPrivate->anchors()->resetTop();
        QQmlPropertyPrivate::setBinding(d->topProp, d->origTopBinding.data());
    }
    if (d->applyOrigBottom) {
        if (!d->origBottomBinding)
            targetPrivate->anchors()->resetBottom();
        QQmlPropertyPrivate::setBinding(d->bottomProp, d->origBottomBinding.data());
    }
    if (d->applyOrigVCenter) {
        if (!d->origVCenterBinding)
            targetPrivate->anchors()->resetVerticalCenter();
        QQmlPropertyPrivate::setBinding(d->vCenterProp, d->origVCenterBinding.data());
    }
    if (d->applyOrigBaseline) {
        if (!d->origBaselineBinding)
            targetPrivate->anchors()->resetBaseline();
        QQmlPropertyPrivate::setBinding(d->baselineProp, d->origBaselineBinding.data());
    }
 
    //reset any anchors that have been specified as "undefined"
    if (d->anchorSet->d_func()->resetAnchors & QQuickAnchors::LeftAnchor) {
        targetPrivate->anchors()->resetLeft();
        QQmlPropertyPrivate::removeBinding(d->leftProp);
    }
    if (d->anchorSet->d_func()->resetAnchors & QQuickAnchors::RightAnchor) {
        targetPrivate->anchors()->resetRight();
        QQmlPropertyPrivate::removeBinding(d->rightProp);
    }
    if (d->anchorSet->d_func()->resetAnchors & QQuickAnchors::HCenterAnchor) {
        targetPrivate->anchors()->resetHorizontalCenter();
        QQmlPropertyPrivate::removeBinding(d->hCenterProp);
    }
    if (d->anchorSet->d_func()->resetAnchors & QQuickAnchors::TopAnchor) {
        targetPrivate->anchors()->resetTop();
        QQmlPropertyPrivate::removeBinding(d->topProp);
    }
    if (d->anchorSet->d_func()->resetAnchors & QQuickAnchors::BottomAnchor) {
        targetPrivate->anchors()->resetBottom();
        QQmlPropertyPrivate::removeBinding(d->bottomProp);
    }
    if (d->anchorSet->d_func()->resetAnchors & QQuickAnchors::VCenterAnchor) {
        targetPrivate->anchors()->resetVerticalCenter();
        QQmlPropertyPrivate::removeBinding(d->vCenterProp);
    }
    if (d->anchorSet->d_func()->resetAnchors & QQuickAnchors::BaselineAnchor) {
        targetPrivate->anchors()->resetBaseline();
        QQmlPropertyPrivate::removeBinding(d->baselineProp);
    }
 
    //set any anchors that have been specified
    if (d->leftBinding)
        QQmlPropertyPrivate::setBinding(d->leftBinding.data());
    if (d->rightBinding)
        QQmlPropertyPrivate::setBinding(d->rightBinding.data());
    if (d->hCenterBinding)
        QQmlPropertyPrivate::setBinding(d->hCenterBinding.data());
    if (d->topBinding)
        QQmlPropertyPrivate::setBinding(d->topBinding.data());
    if (d->bottomBinding)
        QQmlPropertyPrivate::setBinding(d->bottomBinding.data());
    if (d->vCenterBinding)
        QQmlPropertyPrivate::setBinding(d->vCenterBinding.data());
    if (d->baselineBinding)
        QQmlPropertyPrivate::setBinding(d->baselineBinding.data());
}
 
bool QQuickAnchorChanges::isReversable()
{
    return true;
}
 
void QQuickAnchorChanges::reverse()
{
    Q_D(QQuickAnchorChanges);
    if (!d->target)
        return;
 
    QQuickItemPrivate *targetPrivate = QQuickItemPrivate::get(d->target);
    //reset any anchors set by the state
    if (d->leftBinding) {
        targetPrivate->anchors()->resetLeft();
        QQmlPropertyPrivate::removeBinding(d->leftBinding.data());
    }
    if (d->rightBinding) {
        targetPrivate->anchors()->resetRight();
        QQmlPropertyPrivate::removeBinding(d->rightBinding.data());
    }
    if (d->hCenterBinding) {
        targetPrivate->anchors()->resetHorizontalCenter();
        QQmlPropertyPrivate::removeBinding(d->hCenterBinding.data());
    }
    if (d->topBinding) {
        targetPrivate->anchors()->resetTop();
        QQmlPropertyPrivate::removeBinding(d->topBinding.data());
    }
    if (d->bottomBinding) {
        targetPrivate->anchors()->resetBottom();
        QQmlPropertyPrivate::removeBinding(d->bottomBinding.data());
    }
    if (d->vCenterBinding) {
        targetPrivate->anchors()->resetVerticalCenter();
        QQmlPropertyPrivate::removeBinding(d->vCenterBinding.data());
    }
    if (d->baselineBinding) {
        targetPrivate->anchors()->resetBaseline();
        QQmlPropertyPrivate::removeBinding(d->baselineBinding.data());
    }
 
    //restore previous anchors
    if (d->origLeftBinding)
        QQmlPropertyPrivate::setBinding(d->leftProp, d->origLeftBinding.data());
    if (d->origRightBinding)
        QQmlPropertyPrivate::setBinding(d->rightProp, d->origRightBinding.data());
    if (d->origHCenterBinding)
        QQmlPropertyPrivate::setBinding(d->hCenterProp, d->origHCenterBinding.data());
    if (d->origTopBinding)
        QQmlPropertyPrivate::setBinding(d->topProp, d->origTopBinding.data());
    if (d->origBottomBinding)
        QQmlPropertyPrivate::setBinding(d->bottomProp, d->origBottomBinding.data());
    if (d->origVCenterBinding)
        QQmlPropertyPrivate::setBinding(d->vCenterProp, d->origVCenterBinding.data());
    if (d->origBaselineBinding)
        QQmlPropertyPrivate::setBinding(d->baselineProp, d->origBaselineBinding.data());
 
    //restore any absolute geometry changed by the state's anchors
    QQuickAnchors::Anchors stateVAnchors = d->anchorSet->d_func()->usedAnchors & QQuickAnchors::Vertical_Mask;
    QQuickAnchors::Anchors origVAnchors = targetPrivate->anchors()->usedAnchors() & QQuickAnchors::Vertical_Mask;
    QQuickAnchors::Anchors stateHAnchors = d->anchorSet->d_func()->usedAnchors & QQuickAnchors::Horizontal_Mask;
    QQuickAnchors::Anchors origHAnchors = targetPrivate->anchors()->usedAnchors() & QQuickAnchors::Horizontal_Mask;
 
    const QRectF oldGeometry(d->target->position(), d->target->size());
    bool stateSetWidth = (stateHAnchors &&
                          stateHAnchors != QQuickAnchors::LeftAnchor &&
                          stateHAnchors != QQuickAnchors::RightAnchor &&
                          stateHAnchors != QQuickAnchors::HCenterAnchor);
    // in case of an additive AnchorChange, we _did_ end up modifying the width
    stateSetWidth |= ((stateHAnchors & QQuickAnchors::LeftAnchor) && (origHAnchors & QQuickAnchors::RightAnchor)) ||
                     ((stateHAnchors & QQuickAnchors::RightAnchor) && (origHAnchors & QQuickAnchors::LeftAnchor));
    bool origSetWidth = (origHAnchors &&
                         origHAnchors != QQuickAnchors::LeftAnchor &&
                         origHAnchors != QQuickAnchors::RightAnchor &&
                         origHAnchors != QQuickAnchors::HCenterAnchor);
    if (d->origWidth.isValid() && stateSetWidth && !origSetWidth && !qt_is_nan(d->origWidth)) {
        targetPrivate->widthValidFlag = true;
        if (targetPrivate->width != d->origWidth)
            targetPrivate->width.setValueBypassingBindings(d->origWidth);
    }
 
    bool stateSetHeight = (stateVAnchors &&
                           stateVAnchors != QQuickAnchors::TopAnchor &&
                           stateVAnchors != QQuickAnchors::BottomAnchor &&
                           stateVAnchors != QQuickAnchors::VCenterAnchor &&
                           stateVAnchors != QQuickAnchors::BaselineAnchor);
    // in case of an additive AnchorChange, we _did_ end up modifying the height
    stateSetHeight |= ((stateVAnchors & QQuickAnchors::TopAnchor) && (origVAnchors & QQuickAnchors::BottomAnchor)) ||
                     ((stateVAnchors & QQuickAnchors::BottomAnchor) && (origVAnchors & QQuickAnchors::TopAnchor));
    bool origSetHeight = (origVAnchors &&
                          origVAnchors != QQuickAnchors::TopAnchor &&
                          origVAnchors != QQuickAnchors::BottomAnchor &&
                          origVAnchors != QQuickAnchors::VCenterAnchor &&
                          origVAnchors != QQuickAnchors::BaselineAnchor);
    if (d->origHeight.isValid() && stateSetHeight && !origSetHeight && !qt_is_nan(d->origHeight)) {
        targetPrivate->heightValidFlag = true;
        if (targetPrivate->height != d->origHeight)
            targetPrivate->height.setValueBypassingBindings(d->origHeight);
    }
 
    if (stateHAnchors && !origHAnchors && !qt_is_nan(d->origX) && d->origX != targetPrivate->x)
        targetPrivate->x.setValueBypassingBindings(d->origX);
 
    if (stateVAnchors && !origVAnchors && !qt_is_nan(d->origY) && d->origY != targetPrivate->y)
        targetPrivate->y.setValueBypassingBindings(d->origY);
 
    const QRectF newGeometry(d->target->position(), d->target->size());
    if (newGeometry != oldGeometry) {
        QQuickItemPrivate::DirtyType dirtyFlags {};
        if (newGeometry.topLeft() != oldGeometry.topLeft())
            dirtyFlags = QQuickItemPrivate::DirtyType(dirtyFlags | QQuickItemPrivate::Position);
        if (newGeometry.size() != oldGeometry.size())
            dirtyFlags = QQuickItemPrivate::DirtyType(dirtyFlags | QQuickItemPrivate::Size);
        targetPrivate->dirty(dirtyFlags);
        d->target->geometryChange(newGeometry, oldGeometry);
    }
}
 
QQuickStateActionEvent::EventType QQuickAnchorChanges::type() const
{
    return AnchorChanges;
}
 
QList<QQuickStateAction> QQuickAnchorChanges::additionalActions() const
{
    Q_D(const QQuickAnchorChanges);
    QList<QQuickStateAction> extra;
 
    QQuickAnchors::Anchors combined = d->anchorSet->d_func()->usedAnchors | d->anchorSet->d_func()->resetAnchors;
    bool hChange = combined & QQuickAnchors::Horizontal_Mask;
    bool vChange = combined & QQuickAnchors::Vertical_Mask;
 
    if (d->target) {
        QQuickStateAction a;
        if (hChange && d->fromX != d->toX) {
            a.property = QQmlProperty(d->target, QLatin1String("x"));
            a.toValue = d->toX;
            extra << a;
        }
        if (vChange && d->fromY != d->toY) {
            a.property = QQmlProperty(d->target, QLatin1String("y"));
            a.toValue = d->toY;
            extra << a;
        }
        if (hChange && d->fromWidth != d->toWidth) {
            a.property = QQmlProperty(d->target, QLatin1String("width"));
            a.toValue = d->toWidth;
            extra << a;
        }
        if (vChange && d->fromHeight != d->toHeight) {
            a.property = QQmlProperty(d->target, QLatin1String("height"));
            a.toValue = d->toHeight;
            extra << a;
        }
    }
 
    return extra;
}
 
bool QQuickAnchorChanges::changesBindings()
{
    return true;
}
 
void QQuickAnchorChanges::saveOriginals()
{
    Q_D(QQuickAnchorChanges);
    if (!d->target)
        return;
 
    d->origLeftBinding = QQmlPropertyPrivate::binding(d->leftProp);
    d->origRightBinding = QQmlPropertyPrivate::binding(d->rightProp);
    d->origHCenterBinding = QQmlPropertyPrivate::binding(d->hCenterProp);
    d->origTopBinding = QQmlPropertyPrivate::binding(d->topProp);
    d->origBottomBinding = QQmlPropertyPrivate::binding(d->bottomProp);
    d->origVCenterBinding = QQmlPropertyPrivate::binding(d->vCenterProp);
    d->origBaselineBinding = QQmlPropertyPrivate::binding(d->baselineProp);
 
    QQuickItemPrivate *targetPrivate = QQuickItemPrivate::get(d->target);
    if (targetPrivate->widthValid())
        d->origWidth = d->target->width();
    if (targetPrivate->heightValid())
        d->origHeight = d->target->height();
    d->origX = d->target->x();
    d->origY = d->target->y();
 
    d->applyOrigLeft = d->applyOrigRight = d->applyOrigHCenter = d->applyOrigTop
      = d->applyOrigBottom = d->applyOrigVCenter = d->applyOrigBaseline = false;
 
    saveCurrentValues();
}
 
void QQuickAnchorChanges::copyOriginals(QQuickStateActionEvent *other)
{
    Q_D(QQuickAnchorChanges);
    QQuickAnchorChanges *ac = static_cast<QQuickAnchorChanges*>(other);
    QQuickAnchorChangesPrivate *acp = ac->d_func();
 
    QQuickAnchors::Anchors combined = acp->anchorSet->d_func()->usedAnchors |
                                            acp->anchorSet->d_func()->resetAnchors;
 
    //probably also need to revert some things
    d->applyOrigLeft = (combined & QQuickAnchors::LeftAnchor);
    d->applyOrigRight = (combined & QQuickAnchors::RightAnchor);
    d->applyOrigHCenter = (combined & QQuickAnchors::HCenterAnchor);
    d->applyOrigTop = (combined & QQuickAnchors::TopAnchor);
    d->applyOrigBottom = (combined & QQuickAnchors::BottomAnchor);
    d->applyOrigVCenter = (combined & QQuickAnchors::VCenterAnchor);
    d->applyOrigBaseline = (combined & QQuickAnchors::BaselineAnchor);
 
    d->origLeftBinding = acp->origLeftBinding;
    d->origRightBinding = acp->origRightBinding;
    d->origHCenterBinding = acp->origHCenterBinding;
    d->origTopBinding = acp->origTopBinding;
    d->origBottomBinding = acp->origBottomBinding;
    d->origVCenterBinding = acp->origVCenterBinding;
    d->origBaselineBinding = acp->origBaselineBinding;
 
    d->origWidth = acp->origWidth;
    d->origHeight = acp->origHeight;
    d->origX = acp->origX;
    d->origY = acp->origY;
 
    //clear old values from other
    //### could this be generalized for all QQuickStateActionEvents, and called after copyOriginals?
    acp->leftBinding = nullptr;
    acp->rightBinding = nullptr;
    acp->hCenterBinding = nullptr;
    acp->topBinding = nullptr;
    acp->bottomBinding = nullptr;
    acp->vCenterBinding = nullptr;
    acp->baselineBinding = nullptr;
    acp->origLeftBinding = nullptr;
    acp->origRightBinding = nullptr;
    acp->origHCenterBinding = nullptr;
    acp->origTopBinding = nullptr;
    acp->origBottomBinding = nullptr;
    acp->origVCenterBinding = nullptr;
    acp->origBaselineBinding = nullptr;
 
    saveCurrentValues();
}
 
void QQuickAnchorChanges::clearBindings()
{
    Q_D(QQuickAnchorChanges);
    if (!d->target)
        return;
 
    //### should this (saving "from" values) be moved to saveCurrentValues()?
    d->fromX = d->target->x();
    d->fromY = d->target->y();
    d->fromWidth = d->target->width();
    d->fromHeight = d->target->height();
 
    QQuickItemPrivate *targetPrivate = QQuickItemPrivate::get(d->target);
    //reset any anchors with corresponding reverts
    //reset any anchors that have been specified as "undefined"
    //reset any anchors that we'll be setting in the state
    QQuickAnchors::Anchors combined = d->anchorSet->d_func()->resetAnchors |
                                            d->anchorSet->d_func()->usedAnchors;
    if (d->applyOrigLeft || (combined & QQuickAnchors::LeftAnchor)) {
        targetPrivate->anchors()->resetLeft();
        QQmlPropertyPrivate::removeBinding(d->leftProp);
    }
    if (d->applyOrigRight || (combined & QQuickAnchors::RightAnchor)) {
        targetPrivate->anchors()->resetRight();
        QQmlPropertyPrivate::removeBinding(d->rightProp);
    }
    if (d->applyOrigHCenter || (combined & QQuickAnchors::HCenterAnchor)) {
        targetPrivate->anchors()->resetHorizontalCenter();
        QQmlPropertyPrivate::removeBinding(d->hCenterProp);
    }
    if (d->applyOrigTop || (combined & QQuickAnchors::TopAnchor)) {
        targetPrivate->anchors()->resetTop();
        QQmlPropertyPrivate::removeBinding(d->topProp);
    }
    if (d->applyOrigBottom || (combined & QQuickAnchors::BottomAnchor)) {
        targetPrivate->anchors()->resetBottom();
        QQmlPropertyPrivate::removeBinding(d->bottomProp);
    }
    if (d->applyOrigVCenter || (combined & QQuickAnchors::VCenterAnchor)) {
        targetPrivate->anchors()->resetVerticalCenter();
        QQmlPropertyPrivate::removeBinding(d->vCenterProp);
    }
    if (d->applyOrigBaseline || (combined & QQuickAnchors::BaselineAnchor)) {
        targetPrivate->anchors()->resetBaseline();
        QQmlPropertyPrivate::removeBinding(d->baselineProp);
    }
}
 
bool QQuickAnchorChanges::mayOverride(QQuickStateActionEvent*other)
{
    if (other->type() != AnchorChanges)
        return false;
    if (static_cast<QQuickStateActionEvent*>(this) == other)
        return true;
    if (static_cast<QQuickAnchorChanges*>(other)->object() == object())
        return true;
    return false;
}
 
void QQuickAnchorChanges::rewind()
{
    Q_D(QQuickAnchorChanges);
    if (!d->target)
        return;
 
    QQuickItemPrivate *targetPrivate = QQuickItemPrivate::get(d->target);
    const QRectF oldGeometry(d->target->position(), d->target->size());
 
    // Restore previous values (but not previous bindings, i.e. anchors).
    // Also, don't drop any new bindings.
    if (!qt_is_nan(d->rewindX) && d->rewindX != targetPrivate->x)
        targetPrivate->x.setValueBypassingBindings(d->rewindX);
    if (!qt_is_nan(d->rewindY) && d->rewindY != targetPrivate->y)
        targetPrivate->y.setValueBypassingBindings(d->rewindY);
 
    if (targetPrivate->widthValid() && !qt_is_nan(d->rewindWidth)) {
        targetPrivate->widthValidFlag = true;
        if (d->rewindWidth != targetPrivate->width)
            targetPrivate->width.setValueBypassingBindings(d->rewindWidth);
    }
 
    if (targetPrivate->heightValid() && !qt_is_nan(d->rewindHeight)) {
        targetPrivate->heightValidFlag = true;
        if (d->rewindHeight != targetPrivate->height)
            targetPrivate->height.setValueBypassingBindings(d->rewindHeight);
    }
 
    const QRectF newGeometry(d->target->position(), d->target->size());
    if (newGeometry != oldGeometry) {
        targetPrivate->dirty(QQuickItemPrivate::Position);
        d->target->geometryChange(newGeometry, oldGeometry);
    }
}
 
void QQuickAnchorChanges::saveCurrentValues()
{
    Q_D(QQuickAnchorChanges);
    if (!d->target)
        return;
 
    QQuickItemPrivate *targetPrivate = QQuickItemPrivate::get(d->target);
    d->rewindLeft = targetPrivate->anchors()->left();
    d->rewindRight = targetPrivate->anchors()->right();
    d->rewindHCenter = targetPrivate->anchors()->horizontalCenter();
    d->rewindTop = targetPrivate->anchors()->top();
    d->rewindBottom = targetPrivate->anchors()->bottom();
    d->rewindVCenter = targetPrivate->anchors()->verticalCenter();
    d->rewindBaseline = targetPrivate->anchors()->baseline();
 
    d->rewindX = d->target->x();
    d->rewindY = d->target->y();
    d->rewindWidth = d->target->width();
    d->rewindHeight = d->target->height();
}
 
void QQuickAnchorChanges::saveTargetValues()
{
    Q_D(QQuickAnchorChanges);
    if (!d->target)
        return;
 
    d->toX = d->target->x();
    d->toY = d->target->y();
    d->toWidth = d->target->width();
    d->toHeight = d->target->height();
}
 
QT_END_NAMESPACE
 
#include <moc_qquickstateoperations_p.cpp>