SubMusic/source/View/TextView.mc

 using Toybox.WatchUi;
 
 class TextView extends WatchUi.View {

    private var d_msg;
    
    private var d_textarea;

    // Constructor
    function initialize(msg) {
        View.initialize();

		d_msg = msg;
    }
    
    function onLayout(dc) {
    	d_textarea = new WatchUi.TextArea({
    		:text => d_msg,
    		:color => Graphics.COLOR_WHITE,
    		:font => [ Graphics.FONT_SMALL, Graphics.FONT_TINY, Graphics.FONT_XTINY ],
    		:justification => Graphics.TEXT_JUSTIFY_CENTER,
    		:locX => WatchUi.LAYOUT_HALIGN_CENTER,
    		:locY => WatchUi.LAYOUT_VALIGN_CENTER,
            :width => dc.getWidth() * 2 / 3,
            :height => dc.getHeight() * 2 / 3,
    	});
    }

    // Update the View
    function onUpdate(dc) {
        dc.setColor(Graphics.COLOR_BLACK, Graphics.COLOR_BLACK);
        dc.clear();
        dc.setColor(Graphics.COLOR_WHITE, Graphics.COLOR_BLACK);

        d_textarea.draw(dc);
    }
    
    function setText(msg) {
    	d_msg = msg;
    	d_textarea.setText(d_msg);
    	WatchUi.requestUpdate(); // TODO test if requestUpdate is required
    }
    
    function appendText(msg) {
    	d_msg += msg;
    	d_textarea.setText(d_msg);
    	WatchUi.requestUpdate(); // TODO test if requestUpdate is required
    }
}