One more inconsistency worth fixing are the event args:
For gestures args.view(coming form GestureEventData) should be used to get the calling view.
For other events (for example Button.tap) it is args.object (coming from EventData).

In my opinion observe() for gestures cannot be replaced easily with on/addEventListener since in the first case (observe) you can listen for multiple gestures with single callback:

    var lbl = new Label();
    lbl.observe(GestureTypes.tap | GestureTypes.doubleTap | GestureTypes.longPress, args => {
       //
    });

while with on/addEventListener you can listen for just one event:

    var btn = new Button();
    btn.on(Button.tapEvent, args => {
        //
    });

Hi @NathanaelA,

It will be hard to apply the same pattern for regular events since they are strings (the first argument of on/addEventListener) while gesture types are numbers and you can use them in bitwise operations.

Hi @NathanaelA,

Actually you are right - I've made pull request with on/off support for gestures. Please let me know if you have any questions!

Thanks

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