Pop-up on datafield

A general, universal way to do it is this.  When a lap is triggered, a message is displayed for about 5 seconds.  Otherwise, it displays the elapsed seconds.

using Toybox.WatchUi;
using Toybox.Graphics;

class popdfView extends WatchUi.DataField {
	var width,height;
	var elapsedSec=0;
	var lapPopup=0;
	var lapPopupTime=5;

    function initialize() {
        DataField.initialize();
    }

	function onTimerLap() {
		lapPopup=lapPopupTime;
	}
	
    function onLayout(dc) {
		width=dc.getWidth();
		height=dc.getHeight();
    }

    function compute(info) {
        if(info.elapsedTime!=null) {elapsedSec=info.elapsedTime/1000;}
    }

    function onUpdate(dc) {
    	dc.setColor(Graphics.COLOR_BLACK, Graphics.COLOR_BLACK);
    	dc.clear();
    	dc.setColor(Graphics.COLOR_WHITE, Graphics.COLOR_TRANSPARENT);
    	var message="";
    	if(lapPopup==0) {
    		message=elapsedSec.toNumber();
    	} else {
    		lapPopup--;
    		message="new lap";   		
    	}
    	dc.drawText(width/2,height/2, Graphics.FONT_SMALL,message,Graphics.TEXT_JUSTIFY_CENTER|Graphics.TEXT_JUSTIFY_VCENTER);

    }

}