flickable_rect.qml

import QtQuick 2.3

Item {
    id: root
    width: 400
    height: 400

    Flickable {
        anchors.fill: parent
        contentWidth: grid.width
        contentHeight: grid.height

        Grid {
            id: grid
            width: 2 * root.width
            height: 2 * root.height
            columns: 2

            Rectangle {
                color: "red"
                width: root.width
                height: root.height
            }
            Rectangle {
                color: "green"
                width: root.width
                height: root.height
            }
            Rectangle {
                color: "blue"
                width: root.width
                height: root.height
            }
            Rectangle {
                color: "yellow"
                width: root.width
                height: root.height
            }
        }
    }
}