import QtQuick 2.9
import QtQuick.Controls 2.2
import QtQuick.Layouts 1.3

ApplicationWindow {
    id: root

    visible: true
    width: 640
    height: 480

    property bool toggle: true

    GridLayout {
        anchors.fill: parent
        columns: 4
        Rectangle {
            color: "orange"
            Layout.fillWidth: true
            Layout.fillHeight: true
            Layout.column: root.toggle ? 0 : 3
        }
        Rectangle {
            color: "green"
            Layout.fillWidth: true
            Layout.fillHeight: true
            Layout.column: root.toggle ? 1 : 2
        }
    }
    Button {
        anchors.centerIn: parent
        text: "Switch sides"
        onClicked: root.toggle = !root.toggle
    }
}