BlackBerry - how to properly manage a TAP/CLICK in a custom handler

I need to set up an event of click/tap for a custom Manager.

The Manager contains a few items, but I need that all respond to the event Manager, so if the user taps/clicks No matter what item in the Manager, the event handler should be called also. What I've done is to attach a changeListener to a NullField which takes the width and height, but the fieldChanged method is never called

public class TestManager extends Manager{
    private BitmapField _icon;
    private LabelField _lblTitle;
    private NullField nullField;
    public TestManager(Bitmap pIcon){
        super(Manager.FOCUSABLE);
        _icon = new BitmapField(pIcon);
        _lblTitle = new LabelField("This is the title");
        nullField = new NullField(NullField.FOCUSABLE);
        add(_icon);
        add(_lblTitle);
        add(nullField);
            nullField.setChangeListener(new FieldChangeListener() {

        public void fieldChanged(Field field, int context) {
            doSomething();
        }
    });

    }

    public void doSomething(){
    System.out.println("do something!!");
}
    public void paint(Graphics graphics)
    {
       graphics.setColor(Color.DELIMITER_COLOR);
       graphics.fillRect(0, 20, Display.getWidth(), 50);

       super.paint(graphics);
    }

    protected void paintBackground(Graphics arg0) {
       arg0.setColor(Color.LIGHTGRAY);
       arg0.fillRect(0, 0, Display.getWidth(), Display.getHeight());
       super.paint(arg0);
    }

    protected void sublayout(int width, int height) {
        setPositionChild(_icon, UIFactory.getBestX(10), UIFactory.getBestX(8));
        setPositionChild(_lblTitle, UIFactory.getBestX(60), _topMarginTitle!=0?UIFactory.getBestX(_topMarginTitle):UIFactory.getBestX(15));
        setPositionChild(nullField, 0, 0);
        layoutChild(_icon, width, UIFactory.getBestX(50));
        layoutChild(_lblTitle, width, UIFactory.getBestX(50));
        layoutChild(nullField, width, height);
        setExtent(width, height);
    }

      protected boolean navigationClick(int status, int time){
            invalidate();
            doSomething();
            return super.navigationClick(status, time);
        }

}

How can I do this whole handler to respond to a click/tap?

I use the API 5.0

Thanks in advance!

The problem with the help of the NullField of to do, it's that NullField is not programmed to handle any interaction except update.

If you need to replace navigationClick, like you did for the Manager. So that it connects to your plumbing FieldChangeListener (which is the right thing to do in my opinion. you must call fieldChangeNotify, for example):

        protected boolean navigationClick(int status, int time) {
                this.fieldChangeNotify(2);
                return true;
        }

Now you will replace it in the NullFeld because it gets the focus. You must make sure that nothing else in the Manager is focusable.

But you will need some guidance in the manager who is has the focus, so that the user knows - especially for when the user is using the trackpad. To do this, make a focusChangeListener for the NullField Manager and have the listener code set a flag if the focus was acquired or not and then invalidate() himself. In object check the flag and if it is set, paint for focus, if not, paint for any developed.

Come back if this is not clear.

Byt the way, the sublayout in your manager looks a bit ropey to me, it's especially this:

setExtent (width, height);

You really want to show to what extent being large enough to accommodate all your field and no more.

There are other things that I'm not sure, but if it works for you, then I guess it's OK.

Good luck

Tags: BlackBerry Developers

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BlackBerry - how to properly manage a TAP/CLICK in a custom handler

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