import QtQuick 2.4

Item {
    width: 200
    height: 200

    Rectangle {
        id: rect1
        width: 100
        height: 100
        color: "red"

        property var cardWidth: {
            console.log("Evaluating cardWidth width");
            return parent.width >= 200 ? 100 : 50;
        }
    }

    Rectangle {
        id: rect2

        width: {
            console.log("Evaluating rect2 width");
            return rect1.cardWidth >= 100 ? 50 : 25;
        }
        height: 50
        color: "blue"
    }
}