qquickrangeslider.cpp

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// Copyright (C) 2017 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 "qquickrangeslider_p.h"
#include "qquickcontrol_p_p.h"
#include "qquickdeferredexecute_p_p.h"
 
#include <QtCore/qscopedpointer.h>
#include <QtQuick/private/qquickwindow_p.h>
 
QT_BEGIN_NAMESPACE
 
 
class QQuickRangeSliderNodePrivate : public QObjectPrivate
{
    Q_DECLARE_PUBLIC(QQuickRangeSliderNode)
public:
    QQuickRangeSliderNodePrivate(qreal value, QQuickRangeSlider *slider)
        : value(value),
          slider(slider)
    {
    }
 
    bool isFirst() const;
 
    void setPosition(qreal position, bool ignoreOtherPosition = false);
    void updatePosition(bool ignoreOtherPosition = false);
 
    void cancelHandle();
    void executeHandle(bool complete = false);
 
    static QQuickRangeSliderNodePrivate *get(QQuickRangeSliderNode *node);
 
    qreal value = 0;
    bool isPendingValue = false;
    qreal pendingValue = 0;
    qreal position = 0;
    QQuickDeferredPointer<QQuickItem> handle;
    QQuickRangeSlider *slider = nullptr;
    bool pressed = false;
    bool hovered = false;
    int touchId = -1;
};
 
bool QQuickRangeSliderNodePrivate::isFirst() const
{
    return this == get(slider->first());
}
 
void QQuickRangeSliderNodePrivate::setPosition(qreal position, bool ignoreOtherPosition)
{
    Q_Q(QQuickRangeSliderNode);
 
    const qreal min = isFirst() || ignoreOtherPosition ? 0.0 : qMax<qreal>(0.0, slider->first()->position());
    const qreal max = !isFirst() || ignoreOtherPosition ? 1.0 : qMin<qreal>(1.0, slider->second()->position());
    position = qBound(min, position, max);
    if (!qFuzzyCompare(this->position, position)) {
        this->position = position;
        emit q->positionChanged();
        emit q->visualPositionChanged();
    }
}
 
void QQuickRangeSliderNodePrivate::updatePosition(bool ignoreOtherPosition)
{
    qreal pos = 0;
    if (!qFuzzyCompare(slider->from(), slider->to()))
        pos = (value - slider->from()) / (slider->to() - slider->from());
    setPosition(pos, ignoreOtherPosition);
}
 
void QQuickRangeSliderNodePrivate::cancelHandle()
{
    Q_Q(QQuickRangeSliderNode);
    quickCancelDeferred(q, handleName());
}
 
void QQuickRangeSliderNodePrivate::executeHandle(bool complete)
{
    Q_Q(QQuickRangeSliderNode);
    if (handle.wasExecuted())
        return;
 
    if (!handle || complete)
        quickBeginDeferred(q, handleName(), handle);
    if (complete)
        quickCompleteDeferred(q, handleName(), handle);
}
 
QQuickRangeSliderNodePrivate *QQuickRangeSliderNodePrivate::get(QQuickRangeSliderNode *node)
{
    return node->d_func();
}
 
QQuickRangeSliderNode::QQuickRangeSliderNode(qreal value, QQuickRangeSlider *slider)
    : QObject(*(new QQuickRangeSliderNodePrivate(value, slider)), slider)
{
}
 
QQuickRangeSliderNode::~QQuickRangeSliderNode()
{
}
 
qreal QQuickRangeSliderNode::value() const
{
    Q_D(const QQuickRangeSliderNode);
    return d->value;
}
 
void QQuickRangeSliderNode::setValue(qreal value)
{
    Q_D(QQuickRangeSliderNode);
    if (!d->slider->isComponentComplete()) {
        d->pendingValue = value;
        d->isPendingValue = true;
        return;
    }
 
    // First, restrict the first value to be within to and from.
    const qreal smaller = qMin(d->slider->to(), d->slider->from());
    const qreal larger = qMax(d->slider->to(), d->slider->from());
    value = qBound(smaller, value, larger);
 
    // Then, ensure that it doesn't go past the other value,
    // a check that depends on whether or not the range is inverted.
    const bool invertedRange = d->slider->from() > d->slider->to();
    if (d->isFirst()) {
        if (invertedRange) {
            if (value < d->slider->second()->value())
                value = d->slider->second()->value();
        } else {
            if (value > d->slider->second()->value())
                value = d->slider->second()->value();
        }
    } else {
        if (invertedRange) {
            if (value > d->slider->first()->value())
                value = d->slider->first()->value();
        } else {
            if (value < d->slider->first()->value())
                value = d->slider->first()->value();
        }
    }
 
    if (!qFuzzyCompare(d->value, value)) {
        d->value = value;
        d->updatePosition();
        emit valueChanged();
    }
}
 
qreal QQuickRangeSliderNode::position() const
{
    Q_D(const QQuickRangeSliderNode);
    return d->position;
}
 
qreal QQuickRangeSliderNode::visualPosition() const
{
    Q_D(const QQuickRangeSliderNode);
    if (d->slider->orientation() == Qt::Vertical || d->slider->isMirrored())
        return 1.0 - d->position;
    return d->position;
}
 
QQuickItem *QQuickRangeSliderNode::handle() const
{
    QQuickRangeSliderNodePrivate *d = const_cast<QQuickRangeSliderNodePrivate *>(d_func());
    if (!d->handle)
        d->executeHandle();
    return d->handle;
}
 
void QQuickRangeSliderNode::setHandle(QQuickItem *handle)
{
    Q_D(QQuickRangeSliderNode);
    if (d->handle == handle)
        return;
 
    QQuickControlPrivate::warnIfCustomizationNotSupported(d->slider, handle, QStringLiteral("handle"));
 
    if (!d->handle.isExecuting())
        d->cancelHandle();
 
    const qreal oldImplicitHandleWidth = implicitHandleWidth();
    const qreal oldImplicitHandleHeight = implicitHandleHeight();
 
    QQuickControlPrivate::get(d->slider)->removeImplicitSizeListener(d->handle);
    QQuickControlPrivate::hideOldItem(d->handle);
    d->handle = handle;
 
    if (handle) {
        if (!handle->parentItem())
            handle->setParentItem(d->slider);
 
        QQuickItem *firstHandle = QQuickRangeSliderNodePrivate::get(d->slider->first())->handle;
        QQuickItem *secondHandle = QQuickRangeSliderNodePrivate::get(d->slider->second())->handle;
        if (firstHandle && secondHandle) {
            // The order of property assignments in QML is undefined,
            // but we need the first handle to be before the second due
            // to focus order constraints, so check for that here.
            const QList<QQuickItem *> childItems = d->slider->childItems();
            const int firstIndex = childItems.indexOf(firstHandle);
            const int secondIndex = childItems.indexOf(secondHandle);
            if (firstIndex != -1 && secondIndex != -1 && firstIndex > secondIndex) {
                firstHandle->stackBefore(secondHandle);
                // Ensure we have some way of knowing which handle is above
                // the other when it comes to mouse presses, and also that
                // they are rendered in the correct order.
                secondHandle->setZ(secondHandle->z() + 1);
            }
        }
 
        handle->setActiveFocusOnTab(true);
        QQuickControlPrivate::get(d->slider)->addImplicitSizeListener(handle);
    }
 
    if (!qFuzzyCompare(oldImplicitHandleWidth, implicitHandleWidth()))
        emit implicitHandleWidthChanged();
    if (!qFuzzyCompare(oldImplicitHandleHeight, implicitHandleHeight()))
        emit implicitHandleHeightChanged();
    if (!d->handle.isExecuting())
        emit handleChanged();
}
 
bool QQuickRangeSliderNode::isPressed() const
{
    Q_D(const QQuickRangeSliderNode);
    return d->pressed;
}
 
void QQuickRangeSliderNode::setPressed(bool pressed)
{
    Q_D(QQuickRangeSliderNode);
    if (d->pressed == pressed)
        return;
 
    d->pressed = pressed;
    d->slider->setAccessibleProperty("pressed", pressed || d->slider->second()->isPressed());
    emit pressedChanged();
}
 
bool QQuickRangeSliderNode::isHovered() const
{
    Q_D(const QQuickRangeSliderNode);
    return d->hovered;
}
 
void QQuickRangeSliderNode::setHovered(bool hovered)
{
    Q_D(QQuickRangeSliderNode);
    if (d->hovered == hovered)
        return;
 
    d->hovered = hovered;
    emit hoveredChanged();
}
 
qreal QQuickRangeSliderNode::implicitHandleWidth() const
{
    Q_D(const QQuickRangeSliderNode);
    if (!d->handle)
        return 0;
    return d->handle->implicitWidth();
}
 
qreal QQuickRangeSliderNode::implicitHandleHeight() const
{
    Q_D(const QQuickRangeSliderNode);
    if (!d->handle)
        return 0;
    return d->handle->implicitHeight();
}
 
void QQuickRangeSliderNode::increase()
{
    Q_D(QQuickRangeSliderNode);
    qreal step = qFuzzyIsNull(d->slider->stepSize()) ? 0.1 : d->slider->stepSize();
    setValue(d->value + step);
}
 
void QQuickRangeSliderNode::decrease()
{
    Q_D(QQuickRangeSliderNode);
    qreal step = qFuzzyIsNull(d->slider->stepSize()) ? 0.1 : d->slider->stepSize();
    setValue(d->value - step);
}
 
static const qreal defaultFrom = 0.0;
static const qreal defaultTo = 1.0;
 
class QQuickRangeSliderPrivate : public QQuickControlPrivate
{
    Q_DECLARE_PUBLIC(QQuickRangeSlider)
 
public:
    QQuickRangeSliderNode *pressedNode(int touchId = -1) const;
 
#if QT_CONFIG(quicktemplates2_multitouch)
    bool acceptTouch(const QTouchEvent::TouchPoint &point) override;
#endif
    bool handlePress(const QPointF &point, ulong timestamp) override;
    bool handleMove(const QPointF &point, ulong timestamp) override;
    bool handleRelease(const QPointF &point, ulong timestamp) override;
    void handleUngrab() override;
 
    void updateHover(const QPointF &pos);
 
    void itemImplicitWidthChanged(QQuickItem *item) override;
    void itemImplicitHeightChanged(QQuickItem *item) override;
    void itemDestroyed(QQuickItem *item) override;
 
    bool live = true;
    qreal from = defaultFrom;
    qreal to = defaultTo;
    qreal stepSize = 0;
    qreal touchDragThreshold = -1;
    QQuickRangeSliderNode *first = nullptr;
    QQuickRangeSliderNode *second = nullptr;
    QPointF pressPoint;
    Qt::Orientation orientation = Qt::Horizontal;
    QQuickRangeSlider::SnapMode snapMode = QQuickRangeSlider::NoSnap;
};
 
static qreal valueAt(const QQuickRangeSlider *slider, qreal position)
{
    return slider->from() + (slider->to() - slider->from()) * position;
}
 
static qreal snapPosition(const QQuickRangeSlider *slider, qreal position)
{
    const qreal range = slider->to() - slider->from();
    if (qFuzzyIsNull(range))
        return position;
 
    const qreal effectiveStep = slider->stepSize() / range;
    if (qFuzzyIsNull(effectiveStep))
        return position;
 
    return qRound(position / effectiveStep) * effectiveStep;
}
 
static qreal positionAt(const QQuickRangeSlider *slider, QQuickItem *handle, const QPointF &point)
{
    if (slider->orientation() == Qt::Horizontal) {
        const qreal hw = handle ? handle->width() : 0;
        const qreal offset = hw / 2;
        const qreal extent = slider->availableWidth() - hw;
        if (!qFuzzyIsNull(extent)) {
            if (slider->isMirrored())
                return (slider->width() - point.x() - slider->rightPadding() - offset) / extent;
            return (point.x() - slider->leftPadding() - offset) / extent;
        }
    } else {
        const qreal hh = handle ? handle->height() : 0;
        const qreal offset = hh / 2;
        const qreal extent = slider->availableHeight() - hh;
        if (!qFuzzyIsNull(extent))
            return (slider->height() - point.y() - slider->bottomPadding() - offset) / extent;
    }
    return 0;
}
 
QQuickRangeSliderNode *QQuickRangeSliderPrivate::pressedNode(int touchId) const
{
    if (touchId == -1)
        return first->isPressed() ? first : (second->isPressed() ? second : nullptr);
    if (QQuickRangeSliderNodePrivate::get(first)->touchId == touchId)
        return first;
    if (QQuickRangeSliderNodePrivate::get(second)->touchId == touchId)
        return second;
    return nullptr;
}
 
#if QT_CONFIG(quicktemplates2_multitouch)
bool QQuickRangeSliderPrivate::acceptTouch(const QTouchEvent::TouchPoint &point)
{
    int firstId = QQuickRangeSliderNodePrivate::get(first)->touchId;
    int secondId = QQuickRangeSliderNodePrivate::get(second)->touchId;
 
    if (((firstId == -1 || secondId == -1) && point.state() == QEventPoint::Pressed) || point.id() == firstId || point.id() == secondId) {
        touchId = point.id();
        return true;
    }
 
    return false;
}
#endif
 
bool QQuickRangeSliderPrivate::handlePress(const QPointF &point, ulong timestamp)
{
    Q_Q(QQuickRangeSlider);
    QQuickControlPrivate::handlePress(point, timestamp);
    pressPoint = point;
 
    QQuickItem *firstHandle = first->handle();
    QQuickItem *secondHandle = second->handle();
    const bool firstHit = firstHandle && !first->isPressed() && firstHandle->contains(q->mapToItem(firstHandle, point));
    const bool secondHit = secondHandle && !second->isPressed() && secondHandle->contains(q->mapToItem(secondHandle, point));
    QQuickRangeSliderNode *hitNode = nullptr;
    QQuickRangeSliderNode *otherNode = nullptr;
 
    if (firstHit && secondHit) {
        // choose highest
        hitNode = firstHandle->z() > secondHandle->z() ? first : second;
        otherNode = firstHandle->z() > secondHandle->z() ? second : first;
    } else if (firstHit) {
        hitNode = first;
        otherNode = second;
    } else if (secondHit) {
        hitNode = second;
        otherNode = first;
    } else {
        // find the nearest
        const qreal firstPos = positionAt(q, firstHandle, point);
        const qreal secondPos = positionAt(q, secondHandle, point);
        const qreal firstDistance = qAbs(firstPos - first->position());
        const qreal secondDistance = qAbs(secondPos - second->position());
 
        if (qFuzzyCompare(firstDistance, secondDistance)) {
            // same distance => choose the one that can be moved towards the press position
            const bool inverted = from > to;
            if ((!inverted && firstPos < first->position()) || (inverted && firstPos > first->position())) {
                hitNode = first;
                otherNode = second;
            } else {
                hitNode = second;
                otherNode = first;
            }
        } else if (firstDistance < secondDistance) {
            hitNode = first;
            otherNode = second;
        } else {
            hitNode = second;
            otherNode = first;
        }
    }
 
    if (hitNode) {
        hitNode->setPressed(true);
        if (QQuickItem *handle = hitNode->handle()) {
            handle->setZ(1);
 
            // A specific handle was hit, so it should get focus, rather than the default
            // (first handle) that gets focus whenever the RangeSlider itself does - see focusInEvent().
            if (focusPolicy & Qt::ClickFocus)
                handle->forceActiveFocus(Qt::MouseFocusReason);
        }
        QQuickRangeSliderNodePrivate::get(hitNode)->touchId = touchId;
    }
    if (otherNode) {
        if (QQuickItem *handle = otherNode->handle())
            handle->setZ(0);
    }
    return true;
}
 
bool QQuickRangeSliderPrivate::handleMove(const QPointF &point, ulong timestamp)
{
    Q_Q(QQuickRangeSlider);
    QQuickControlPrivate::handleMove(point, timestamp);
    QQuickRangeSliderNode *pressedNode = QQuickRangeSliderPrivate::pressedNode(touchId);
    if (pressedNode) {
        const qreal oldPos = pressedNode->position();
        qreal pos = positionAt(q, pressedNode->handle(), point);
        if (snapMode == QQuickRangeSlider::SnapAlways)
            pos = snapPosition(q, pos);
        if (live)
            pressedNode->setValue(valueAt(q, pos));
        else
            QQuickRangeSliderNodePrivate::get(pressedNode)->setPosition(pos);
 
        if (!qFuzzyCompare(pressedNode->position(), oldPos))
            emit pressedNode->moved();
    }
    return true;
}
 
bool QQuickRangeSliderPrivate::handleRelease(const QPointF &point, ulong timestamp)
{
    Q_Q(QQuickRangeSlider);
    QQuickControlPrivate::handleRelease(point, timestamp);
    pressPoint = QPointF();
 
    QQuickRangeSliderNode *pressedNode = QQuickRangeSliderPrivate::pressedNode(touchId);
    if (!pressedNode)
        return true;
    QQuickRangeSliderNodePrivate *pressedNodePrivate = QQuickRangeSliderNodePrivate::get(pressedNode);
 
    const qreal oldPos = pressedNode->position();
    qreal pos = positionAt(q, pressedNode->handle(), point);
    if (snapMode != QQuickRangeSlider::NoSnap)
        pos = snapPosition(q, pos);
    qreal val = valueAt(q, pos);
    if (!qFuzzyCompare(val, pressedNode->value()))
        pressedNode->setValue(val);
    else if (snapMode != QQuickRangeSlider::NoSnap)
        pressedNodePrivate->setPosition(pos);
    q->setKeepMouseGrab(false);
    q->setKeepTouchGrab(false);
 
    if (!qFuzzyCompare(pressedNode->position(), oldPos))
        emit pressedNode->moved();
 
    pressedNode->setPressed(false);
    pressedNodePrivate->touchId = -1;
    return true;
}
 
void QQuickRangeSliderPrivate::handleUngrab()
{
    QQuickControlPrivate::handleUngrab();
    pressPoint = QPointF();
    first->setPressed(false);
    second->setPressed(false);
    QQuickRangeSliderNodePrivate::get(first)->touchId = -1;
    QQuickRangeSliderNodePrivate::get(second)->touchId = -1;
}
 
void QQuickRangeSliderPrivate::updateHover(const QPointF &pos)
{
    Q_Q(QQuickRangeSlider);
    QQuickItem *firstHandle = first->handle();
    QQuickItem *secondHandle = second->handle();
    bool firstHandleHovered = firstHandle && firstHandle->isEnabled()
            && firstHandle->contains(q->mapToItem(firstHandle, pos));
    bool secondHandleHovered = secondHandle && secondHandle->isEnabled()
            && secondHandle->contains(q->mapToItem(secondHandle, pos));
 
    if (firstHandleHovered && secondHandleHovered) {
        // Only hover the handle with the higher Z value.
        const bool firstHandleHasHigherZ = firstHandle->z() > secondHandle->z();
        firstHandleHovered = firstHandleHasHigherZ;
        secondHandleHovered = !firstHandleHasHigherZ;
    }
    first->setHovered(firstHandleHovered);
    second->setHovered(secondHandleHovered);
}
 
void QQuickRangeSliderPrivate::itemImplicitWidthChanged(QQuickItem *item)
{
    QQuickControlPrivate::itemImplicitWidthChanged(item);
    if (item == first->handle())
        emit first->implicitHandleWidthChanged();
    else if (item == second->handle())
        emit second->implicitHandleWidthChanged();
}
 
void QQuickRangeSliderPrivate::itemImplicitHeightChanged(QQuickItem *item)
{
    QQuickControlPrivate::itemImplicitHeightChanged(item);
    if (item == first->handle())
        emit first->implicitHandleHeightChanged();
    else if (item == second->handle())
        emit second->implicitHandleHeightChanged();
}
 
void QQuickRangeSliderPrivate::itemDestroyed(QQuickItem *item)
{
    QQuickControlPrivate::itemDestroyed(item);
    if (item == first->handle())
        first->setHandle(nullptr);
    else if (item == second->handle())
        second->setHandle(nullptr);
}
 
QQuickRangeSlider::QQuickRangeSlider(QQuickItem *parent)
    : QQuickControl(*(new QQuickRangeSliderPrivate), parent)
{
    Q_D(QQuickRangeSlider);
    d->first = new QQuickRangeSliderNode(0.0, this);
    d->second = new QQuickRangeSliderNode(1.0, this);
    d->setSizePolicy(QLayoutPolicy::Preferred, QLayoutPolicy::Fixed);
 
    setFlag(QQuickItem::ItemIsFocusScope);
#ifdef Q_OS_MACOS
    setFocusPolicy(Qt::TabFocus);
#else
    setFocusPolicy(Qt::StrongFocus);
#endif
    setAcceptedMouseButtons(Qt::LeftButton);
#if QT_CONFIG(quicktemplates2_multitouch)
    setAcceptTouchEvents(true);
#endif
#if QT_CONFIG(cursor)
    setCursor(Qt::ArrowCursor);
#endif
}
 
QQuickRangeSlider::~QQuickRangeSlider()
{
    Q_D(QQuickRangeSlider);
    d->removeImplicitSizeListener(d->first->handle());
    d->removeImplicitSizeListener(d->second->handle());
}
 
qreal QQuickRangeSlider::from() const
{
    Q_D(const QQuickRangeSlider);
    return d->from;
}
 
void QQuickRangeSlider::setFrom(qreal from)
{
    Q_D(QQuickRangeSlider);
    if (qFuzzyCompare(d->from, from))
        return;
 
    d->from = from;
    emit fromChanged();
 
    if (isComponentComplete()) {
        d->first->setValue(d->first->value());
        d->second->setValue(d->second->value());
        auto *firstPrivate = QQuickRangeSliderNodePrivate::get(d->first);
        auto *secondPrivate = QQuickRangeSliderNodePrivate::get(d->second);
        firstPrivate->updatePosition(true);
        secondPrivate->updatePosition();
    }
}
 
qreal QQuickRangeSlider::to() const
{
    Q_D(const QQuickRangeSlider);
    return d->to;
}
 
void QQuickRangeSlider::setTo(qreal to)
{
    Q_D(QQuickRangeSlider);
    if (qFuzzyCompare(d->to, to))
        return;
 
    d->to = to;
    emit toChanged();
 
    if (isComponentComplete()) {
        d->first->setValue(d->first->value());
        d->second->setValue(d->second->value());
        auto *firstPrivate = QQuickRangeSliderNodePrivate::get(d->first);
        auto *secondPrivate = QQuickRangeSliderNodePrivate::get(d->second);
        firstPrivate->updatePosition(true);
        secondPrivate->updatePosition();
    }
}
 
qreal QQuickRangeSlider::touchDragThreshold() const
{
    Q_D(const QQuickRangeSlider);
    return d->touchDragThreshold;
}
 
void QQuickRangeSlider::setTouchDragThreshold(qreal touchDragThreshold)
{
    Q_D(QQuickRangeSlider);
    if (d->touchDragThreshold == touchDragThreshold)
        return;
 
    d->touchDragThreshold = touchDragThreshold;
    emit touchDragThresholdChanged();
}
 
void QQuickRangeSlider::resetTouchDragThreshold()
{
    setTouchDragThreshold(-1);
}
 
qreal QQuickRangeSlider::valueAt(qreal position) const
{
    Q_D(const QQuickRangeSlider);
    const qreal value = (d->to - d->from) * position;
    if (qFuzzyIsNull(d->stepSize))
        return d->from + value;
    return d->from + qRound(value / d->stepSize) * d->stepSize;
}
 
QQuickRangeSliderNode *QQuickRangeSlider::first() const
{
    Q_D(const QQuickRangeSlider);
    return d->first;
}
 
QQuickRangeSliderNode *QQuickRangeSlider::second() const
{
    Q_D(const QQuickRangeSlider);
    return d->second;
}
 
qreal QQuickRangeSlider::stepSize() const
{
    Q_D(const QQuickRangeSlider);
    return d->stepSize;
}
 
void QQuickRangeSlider::setStepSize(qreal step)
{
    Q_D(QQuickRangeSlider);
    if (qFuzzyCompare(d->stepSize, step))
        return;
 
    d->stepSize = step;
    emit stepSizeChanged();
}
 
QQuickRangeSlider::SnapMode QQuickRangeSlider::snapMode() const
{
    Q_D(const QQuickRangeSlider);
    return d->snapMode;
}
 
void QQuickRangeSlider::setSnapMode(SnapMode mode)
{
    Q_D(QQuickRangeSlider);
    if (d->snapMode == mode)
        return;
 
    d->snapMode = mode;
    emit snapModeChanged();
}
 
Qt::Orientation QQuickRangeSlider::orientation() const
{
    Q_D(const QQuickRangeSlider);
    return d->orientation;
}
 
void QQuickRangeSlider::setOrientation(Qt::Orientation orientation)
{
    Q_D(QQuickRangeSlider);
    if (d->orientation == orientation)
        return;
 
    if (orientation == Qt::Horizontal)
        d->setSizePolicy(QLayoutPolicy::Preferred, QLayoutPolicy::Fixed);
    else
        d->setSizePolicy(QLayoutPolicy::Fixed, QLayoutPolicy::Preferred);
 
    d->orientation = orientation;
    emit orientationChanged();
}
 
void QQuickRangeSlider::setValues(qreal firstValue, qreal secondValue)
{
    Q_D(QQuickRangeSlider);
    // Restrict the values to be within to and from.
    const qreal smaller = qMin(d->to, d->from);
    const qreal larger = qMax(d->to, d->from);
    firstValue = qBound(smaller, firstValue, larger);
    secondValue = qBound(smaller, secondValue, larger);
 
    if (d->from > d->to) {
        // If the from and to values are reversed, the secondValue
        // might be less than the first value, which is not allowed.
        if (secondValue > firstValue)
            secondValue = firstValue;
    } else {
        // Otherwise, clamp first to second if it's too large.
        if (firstValue > secondValue)
            firstValue = secondValue;
    }
 
    // Then set both values. If they didn't change, no change signal will be emitted.
    QQuickRangeSliderNodePrivate *firstPrivate = QQuickRangeSliderNodePrivate::get(d->first);
    if (firstValue != firstPrivate->value) {
        firstPrivate->value = firstValue;
        emit d->first->valueChanged();
    }
 
    QQuickRangeSliderNodePrivate *secondPrivate = QQuickRangeSliderNodePrivate::get(d->second);
    if (secondValue != secondPrivate->value) {
        secondPrivate->value = secondValue;
        emit d->second->valueChanged();
    }
 
    // After we've set both values, then we can update the positions.
    // If we don't do this last, the positions may be incorrect.
    firstPrivate->updatePosition(true);
    secondPrivate->updatePosition();
}
 
bool QQuickRangeSlider::live() const
{
    Q_D(const QQuickRangeSlider);
    return d->live;
}
 
void QQuickRangeSlider::setLive(bool live)
{
    Q_D(QQuickRangeSlider);
    if (d->live == live)
        return;
 
    d->live = live;
    emit liveChanged();
}
 
bool QQuickRangeSlider::isHorizontal() const
{
    Q_D(const QQuickRangeSlider);
    return d->orientation == Qt::Horizontal;
}
 
bool QQuickRangeSlider::isVertical() const
{
    Q_D(const QQuickRangeSlider);
    return d->orientation == Qt::Vertical;
}
 
void QQuickRangeSlider::focusInEvent(QFocusEvent *event)
{
    Q_D(QQuickRangeSlider);
    QQuickControl::focusInEvent(event);
 
    // The active focus ends up to RangeSlider when using forceActiveFocus()
    // or QML KeyNavigation. We must forward the focus to one of the handles,
    // because RangeSlider handles key events for the focused handle. If
    // neither handle has active focus, RangeSlider doesn't do anything.
    QQuickItem *handle = nextItemInFocusChain();
    // QQuickItem::nextItemInFocusChain() only works as desired with
    // Qt::TabFocusAllControls. otherwise pick the first handle
    if (!handle || handle == this)
        handle = d->first->handle();
    if (handle)
        handle->forceActiveFocus(event->reason());
}
 
void QQuickRangeSlider::keyPressEvent(QKeyEvent *event)
{
    Q_D(QQuickRangeSlider);
    QQuickControl::keyPressEvent(event);
 
    QQuickRangeSliderNode *focusNode = d->first->handle()->hasActiveFocus()
        ? d->first : (d->second->handle()->hasActiveFocus() ? d->second : nullptr);
    if (!focusNode)
        return;
 
    const qreal oldValue = focusNode->value();
    if (d->orientation == Qt::Horizontal) {
        if (event->key() == Qt::Key_Left) {
            focusNode->setPressed(true);
            if (isMirrored())
                focusNode->increase();
            else
                focusNode->decrease();
            event->accept();
        } else if (event->key() == Qt::Key_Right) {
            focusNode->setPressed(true);
            if (isMirrored())
                focusNode->decrease();
            else
                focusNode->increase();
            event->accept();
        }
    } else {
        if (event->key() == Qt::Key_Up) {
            focusNode->setPressed(true);
            focusNode->increase();
            event->accept();
        } else if (event->key() == Qt::Key_Down) {
            focusNode->setPressed(true);
            focusNode->decrease();
            event->accept();
        }
    }
    if (!qFuzzyCompare(focusNode->value(), oldValue))
        emit focusNode->moved();
}
 
void QQuickRangeSlider::hoverEnterEvent(QHoverEvent *event)
{
    Q_D(QQuickRangeSlider);
    QQuickControl::hoverEnterEvent(event);
    d->updateHover(event->position());
    event->ignore();
}
 
void QQuickRangeSlider::hoverMoveEvent(QHoverEvent *event)
{
    Q_D(QQuickRangeSlider);
    QQuickControl::hoverMoveEvent(event);
    d->updateHover(event->position());
    event->ignore();
}
 
void QQuickRangeSlider::hoverLeaveEvent(QHoverEvent *event)
{
    Q_D(QQuickRangeSlider);
    QQuickControl::hoverLeaveEvent(event);
    d->first->setHovered(false);
    d->second->setHovered(false);
    event->ignore();
}
 
void QQuickRangeSlider::keyReleaseEvent(QKeyEvent *event)
{
    Q_D(QQuickRangeSlider);
    QQuickControl::keyReleaseEvent(event);
    d->first->setPressed(false);
    d->second->setPressed(false);
}
 
void QQuickRangeSlider::mousePressEvent(QMouseEvent *event)
{
    Q_D(QQuickRangeSlider);
    QQuickControl::mousePressEvent(event);
    d->handleMove(event->position(), event->timestamp());
    setKeepMouseGrab(true);
}
 
#if QT_CONFIG(quicktemplates2_multitouch)
void QQuickRangeSlider::touchEvent(QTouchEvent *event)
{
    Q_D(QQuickRangeSlider);
    switch (event->type()) {
    case QEvent::TouchUpdate:
        for (const QTouchEvent::TouchPoint &point : event->points()) {
            if (!d->acceptTouch(point))
                continue;
 
            switch (point.state()) {
            case QEventPoint::Pressed:
                d->handlePress(point.position(), event->timestamp());
                break;
            case QEventPoint::Updated:
                if (!keepTouchGrab()) {
                    if (d->orientation == Qt::Horizontal)
                        setKeepTouchGrab(QQuickWindowPrivate::dragOverThreshold(point.position().x() - point.pressPosition().x(), Qt::XAxis, &point, qRound(d->touchDragThreshold)));
                    else
                        setKeepTouchGrab(QQuickWindowPrivate::dragOverThreshold(point.position().y() - point.pressPosition().y(), Qt::YAxis, &point, qRound(d->touchDragThreshold)));
                }
                if (keepTouchGrab())
                    d->handleMove(point.position(), event->timestamp());
                break;
            case QEventPoint::Released:
                d->handleRelease(point.position(), event->timestamp());
                break;
            default:
                break;
            }
        }
        break;
 
    default:
        QQuickControl::touchEvent(event);
        break;
    }
}
#endif
 
void QQuickRangeSlider::mirrorChange()
{
    Q_D(QQuickRangeSlider);
    QQuickControl::mirrorChange();
    emit d->first->visualPositionChanged();
    emit d->second->visualPositionChanged();
}
 
void QQuickRangeSlider::classBegin()
{
    Q_D(QQuickRangeSlider);
    QQuickControl::classBegin();
 
    QQmlContext *context = qmlContext(this);
    if (context) {
        QQmlEngine::setContextForObject(d->first, context);
        QQmlEngine::setContextForObject(d->second, context);
    }
}
 
void QQuickRangeSlider::componentComplete()
{
    Q_D(QQuickRangeSlider);
    QQuickRangeSliderNodePrivate *firstPrivate = QQuickRangeSliderNodePrivate::get(d->first);
    QQuickRangeSliderNodePrivate *secondPrivate = QQuickRangeSliderNodePrivate::get(d->second);
    firstPrivate->executeHandle(true);
    secondPrivate->executeHandle(true);
 
    QQuickControl::componentComplete();
 
    if (firstPrivate->isPendingValue || secondPrivate->isPendingValue
        || !qFuzzyCompare(d->from, defaultFrom) || !qFuzzyCompare(d->to, defaultTo)) {
        // Properties were set while we were loading. To avoid clamping issues that occur when setting the
        // values of first and second overriding values set by the user, set them all at once at the end.
        // Another reason that we must set these values here is that the from and to values might have made the old range invalid.
        setValues(firstPrivate->isPendingValue ? firstPrivate->pendingValue : firstPrivate->value,
                      secondPrivate->isPendingValue ? secondPrivate->pendingValue : secondPrivate->value);
 
        firstPrivate->pendingValue = 0;
        firstPrivate->isPendingValue = false;
        secondPrivate->pendingValue = 0;
        secondPrivate->isPendingValue = false;
    } else {
        // If there was no pending data, we must still update the positions,
        // as first.setValue()/second.setValue() won't be called as part of default construction.
        // Don't need to ignore the second position when updating the first position here,
        // as our default values are guaranteed to be valid.
        firstPrivate->updatePosition();
        secondPrivate->updatePosition();
    }
}
 
#if QT_CONFIG(accessibility)
QAccessible::Role QQuickRangeSlider::accessibleRole() const
{
    return QAccessible::Slider;
}
#endif
 
QT_END_NAMESPACE
 
#include "moc_qquickrangeslider_p.cpp"