qt-everywhere-src-5.15.1/qtgraphicaleffects/tests/manual/testbed/PositionPicker.qml

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import QtQuick 2.12

Image {
    id: positionPicker
    property real xValue: 0
    property real yValue: 0

    x: parent.width * xValue - positionPicker.width / 2
    y: parent.height * yValue - positionPicker.height / 2

    property alias pressed: mouseArea.pressed

    source: pressed ? "images/slider_handle_pressed.png" : "images/slider_handle.png"

    MouseArea {
        id: mouseArea

        property real startX
        property real startY

        anchors.fill: parent
        onPressed: {
            startX = mouseX;
            startY = mouseY;
        }

        onPositionChanged: {
            xValue = (positionPicker.x + positionPicker.width / 2 + mouseX - startX) / positionPicker.parent.width;
            yValue = (positionPicker.y + positionPicker.height / 2 + mouseY - startY) / positionPicker.parent.height;
        }
    }
}