Where is the source of CircularGauge?

Alien

Hey,

I want to know how QT's developers implement CircularGauge I don't know if they implement it in C++ or just made it in qml?
In both case where is the source code?

Yours,
Alien

sierdzio

Looks like it is implemented in QML: https://code.woboq.org/qt5/qtquickcontrols/src/extras/plugin.cpp.html#83

Alien

Dear @sierdzio it is just registration of CircularGauge. Is it implemented by qml itself or it is implemented in C++ by inheritance of QGSNode/QPainter?

Also I have a look at CircularGauge.qml :

Control {
    id: circularGauge

    style: Settings.styleComponent(Settings.style, "CircularGaugeStyle.qml", circularGauge)

    /*!
        \qmlproperty real CircularGauge::minimumValue

        This property holds the smallest value displayed by the gauge.
    */
    property alias minimumValue: range.minimumValue

    /*!
        \qmlproperty real CircularGauge::maximumValue

        This property holds the largest value displayed by the gauge.
    */
    property alias maximumValue: range.maximumValue

    /*!
        This property holds the current value displayed by the gauge, which will
        always be between \l minimumValue and \l maximumValue, inclusive.
    */
    property alias value: range.value

    /*!
        \qmlproperty real CircularGauge::stepSize

        This property holds the size of the value increments that the needle
        displays.

        For example, when stepSize is \c 10 and value is \c 0, adding \c 5 to
        \l value will have no visible effect on the needle, although \l value
        will still be incremented. Adding an extra \c 5 to \l value will then
        cause the needle to point to \c 10.
    */
    property alias stepSize: range.stepSize

    /*!
        This property determines whether or not the gauge displays tickmarks,
        minor tickmarks, and labels.

        For more fine-grained control over what is displayed, the following
        style components of
        \l CircularGaugeStyle can be
        used:

        \list
            \li \l {CircularGaugeStyle::}{tickmark}
            \li \l {CircularGaugeStyle::}{minorTickmark}
            \li \l {CircularGaugeStyle::}{tickmarkLabel}
        \endlist
    */
    property bool tickmarksVisible: true

    RangeModel {
        id: range
        minimumValue: 0
        maximumValue: 100
        stepSize: 0
        value: minimumValue
    }
}

Is it the whole implementation?!

sierdzio

See qtquickcontrols/src/extras/Styles/Flat/CircularGaugeStyle.qml

It's implemented in QML, as I said already, and in a pretty bad way, too (2 Canvas elements...).