qt-everywhere-src-5.14.1/qtwebglplugin/tests/plugins/platforms/webgl/colors.qml

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import QtQuick 2.0

Rectangle {
    property var nextColor: function* () {
        while (true) {
            yield "red";
            yield "green";
            yield "blue";
        }
    }

    MouseArea {
        id: mouseArea
        property var coroutine: nextColor()
        anchors.fill: parent
        onClicked: parent.color = coroutine.next().value
    }

    Component.onCompleted: mouseArea.clicked(undefined)
}