Class to how memory usage

    class ShowMemory(parent : QWidget) extends QWidget(parent) {
        private val alignment  = Qt.AlignmentFlag.createQFlags(Qt.AlignmentFlag.AlignRight, Qt.AlignmentFlag.AlignVCenter)
        private val formLayout = new QFormLayout
        private val freeMem    = new QLabel("")
        private val maxMem     = new QLabel("")
        private val m_timer    = new QTimer(this)
        private val totalMem   = new QLabel("")
        private val usedMem    = new QLabel("")

        private def showMemory() {
            val mb      = 1024 * 1024
            val runtime = Runtime.getRuntime
            val unit    = " MB"

            val free    = runtime.freeMemory  / mb
            val max     = runtime.maxMemory   / mb
            val total   = runtime.totalMemory / mb
            val used    = total - free

            freeMem.setText( free  + unit)
            maxMem.setText(  max   + unit)
            totalMem.setText(total + unit)
            usedMem.setText( used  + unit)
        }

        freeMem.setAlignment(alignment)
        maxMem.setAlignment(alignment)
        totalMem.setAlignment(alignment)
        usedMem.setAlignment(alignment)
        formLayout.addRow("Used Memory",  usedMem)
        formLayout.addRow("Free Memory",  freeMem)
        formLayout.addRow("Total Memory", totalMem)
        formLayout.addRow("Max Memory",   maxMem)

        m_timer.timeout.connect(this, "showMemory()")
        m_timer.start(60000)

        setLayout(formLayout)
        showMemory
        setWindowTitle("Used Memory")
    }