qt-everywhere-src-5.15.1/qtquickcontrols/src/extras/Styles/Flat/CheckBoxDrawer.qml

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import QtQuick 2.3
import QtQuick.Controls 1.2
import QtQuick.Controls.Private 1.0
import QtQuick.Controls.Styles.Flat 1.0

// Internal, for use with CheckBoxStyle and GroupBoxStyle
Item {
    implicitWidth: Math.round(26 * FlatStyle.scaleFactor)
    implicitHeight: implicitWidth

    property bool controlEnabled: false
    property bool controlActiveFocus: false
    property bool controlPressed: false
    property bool controlHovered: false
    property bool controlChecked: false
    property alias backgroundVisible: background.visible

    onControlActiveFocusChanged: checkCanvas.requestPaint()
    onControlEnabledChanged: checkCanvas.requestPaint()
    onControlPressedChanged: checkCanvas.requestPaint()

    Rectangle {
        id: background
        anchors.centerIn: parent
        width: Math.round(20 * FlatStyle.scaleFactor)
        height: width
        radius: FlatStyle.radius
        color: controlEnabled ? (controlPressed ? FlatStyle.lightFrameColor : FlatStyle.backgroundColor) : FlatStyle.disabledFillColor
        border.color: !controlEnabled ? FlatStyle.disabledFillColor :
            (controlPressed ? FlatStyle.darkFrameColor :
            (controlActiveFocus ? FlatStyle.focusedColor :
            (controlHovered ? FlatStyle.styleColor : FlatStyle.lightFrameColor)))
        border.width: controlActiveFocus &&
            !controlPressed ? FlatStyle.twoPixels : FlatStyle.onePixel
    }

    Canvas {
        id: checkCanvas
        anchors.centerIn: parent
        width: Math.round(20 * FlatStyle.scaleFactor)
        height: width
        visible: controlChecked

        onPaint: {
            var ctx = getContext("2d");
            ctx.reset();

            ctx.beginPath();
            ctx.moveTo(0.417 * width, 0.783 * height);
            ctx.lineTo(0.152 * width, 0.519 * height);
            ctx.lineTo(0.248 * width, 0.423 * height);
            ctx.lineTo(0.417 * width, 0.593 * height);
            ctx.lineTo(0.75 * width, 0.26 * height);
            ctx.lineTo(0.846 * width, 0.355 * height);
            ctx.lineTo();
            ctx.closePath();
            ctx.fillStyle = !controlEnabled ? FlatStyle.mediumFrameColor :
                (controlPressed ? FlatStyle.checkedAndPressedColor :
                (controlActiveFocus ? FlatStyle.focusedColor : FlatStyle.styleColor));
            ctx.fill();
        }
    }

}