import QtQuick 2.9
import QtQuick.Window 2.2
import QtQuick.Controls 2.2

ApplicationWindow {
    id: window
    width: 300
    height: 300
    visible: true

    Slider {
        id: slider
        live: true
        anchors.right: parent.right
        from: 0
        to: 100
    }

    Row {
        id: row
        Rectangle {
            color: "transparent"
            border.color: "darkorange"
            implicitWidth: slider.value
            implicitHeight: slider.value
        }
        Rectangle {
            color: "transparent"
            border.color: "darkorange"
            implicitWidth: slider.value
            implicitHeight: slider.value
        }
    }

    Rectangle {
        color: "transparent"
        border.color: "black"
        anchors.fill: row
    }
}