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**
** Copyright (C) 2016 The Qt Company Ltd.
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** This file is part of the Qt Quick Templates 2 module of the Qt Toolkit.
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****************************************************************************/

#include "qquickswitchdelegate_p.h"

#include "qquickitemdelegate_p_p.h"

QT_BEGIN_NAMESPACE

/*!
    \qmltype SwitchDelegate
    \inherits ItemDelegate
    \instantiates QQuickSwitchDelegate
    \inqmlmodule QtQuick.Controls
    \since 5.7
    \ingroup qtquickcontrols2-delegates
    \brief An item delegate that can be toggled on or off.

    \image qtquickcontrols2-switchdelegate.gif

    SwitchDelegate presents an item delegate that can be toggled on (checked) or
    off (unchecked). Switch delegates are typically used to select one or more
    options from a set of options.

    The state of the check delegate can be set with the
    \l {AbstractButton::}{checked} property.

    \code
    ListView {
        model: ["Option 1", "Option 2", "Option 3"]
        delegate: SwitchDelegate {
            text: modelData
        }
    }
    \endcode

    \sa {Customizing SwitchDelegate}, {Delegate Controls}
*/

class QQuickSwitchDelegatePrivate : public QQuickItemDelegatePrivate
{
    Q_DECLARE_PUBLIC(QQuickSwitchDelegate)

public:
    QQuickSwitchDelegatePrivate() :
        position(0)
    {
    }

    void updatePosition();
    qreal positionAt(const QPoint &point) const;

    qreal position;
};

void QQuickSwitchDelegatePrivate::updatePosition()
{
    Q_Q(QQuickSwitchDelegate);
    q->setPosition(checked ? 1.0 : 0.0);
}

qreal QQuickSwitchDelegatePrivate::positionAt(const QPoint &point) const
{
    Q_Q(const QQuickSwitchDelegate);
    qreal pos = point.x() / indicator->width();
    if (q->isMirrored())
        return 1.0 - pos;
    return pos;
}

QQuickSwitchDelegate::QQuickSwitchDelegate(QQuickItem *parent) :
    QQuickItemDelegate(*(new QQuickSwitchDelegatePrivate), parent)
{
    setCheckable(true);

    QObjectPrivate::connect(this, &QQuickAbstractButton::checkedChanged, d_func(), &QQuickSwitchDelegatePrivate::updatePosition);
}

/*!
    \qmlproperty real QtQuick.Controls::SwitchDelegate::position
    \readonly

    \input includes/qquickswitch.qdocinc position
*/
qreal QQuickSwitchDelegate::position() const
{
    Q_D(const QQuickSwitchDelegate);
    return d->position;
}

void QQuickSwitchDelegate::setPosition(qreal position)
{
    Q_D(QQuickSwitchDelegate);
    position = qBound<qreal>(0.0, position, 1.0);
    if (qFuzzyCompare(d->position, position))
        return;

    d->position = position;
    emit positionChanged();
    emit visualPositionChanged();
}

/*!
    \qmlproperty real QtQuick.Controls::SwitchDelegate::visualPosition
    \readonly

    \input includes/qquickswitch.qdocinc visualPosition
*/
qreal QQuickSwitchDelegate::visualPosition() const
{
    Q_D(const QQuickSwitchDelegate);
    if (isMirrored())
        return 1.0 - d->position;
    return d->position;
}

QFont QQuickSwitchDelegate::defaultFont() const
{
    return QQuickControlPrivate::themeFont(QPlatformTheme::ListViewFont);
}

void QQuickSwitchDelegate::mirrorChange()
{
    QQuickItemDelegate::mirrorChange();
    emit visualPositionChanged();
}

QT_END_NAMESPACE