Differences between navigationClick and the TrackWheelListener

In fact, I have a few questions here.

What are the differences between navigationClick and the TrackWheelListener?  When should I use that one.  I'm trying to follow the MVC pattern.

Is there a good example of a code that follows the MVC pattern?

The TrackwheelListener really must be used when a peripheral wheel and make your own custom management of movements on the device wheel.  Due to the transition between the wheel (eg. 8700) and trackball devices (eg. 8100 and more) we mapped the trackball to the TrackwheelListener events in an attempt to ensure backward compatibility.  However, it does appear the following limitations:

(1) left and right movement does not exist in a TrackwheelListener, but it is possible using the Trackball.  As a result, users have a user experience on a Trackball device.  Many vendors allow the user, hold down the ALT key and roll the ball up and down control to indicate the left/right movement as a work-around.  But again, this isn't the best user experience.

(2) TrackwheelListener is an independent mechanism of the UI classes.  Therefore, once you receive notification of a movement or click you are then required to determine which field in your user interface should work on this movement or click.  This requires additional processing and the code to determine how to handle the event.

Therefore, the recommendation is that you would substitute navigationClick, navigationMovement, and navigationUnclick methods to manage all movement of the trackball and scroll wheel.  It will manage both wheel and trackball devices correctly which solves #1.  It is also integrated in the UI classes themselves which reduces the impact of the #2 above.

The only drawback to the use of these methods is that it requires your application built with the JDE 4.2.0 and requires a minimum of 4.2.0 terminal software.  For the vast majority of third-party developers, v4.2.0 is a sufficient minimum requirement given the proportion of the market that is running 4.2.0 or higher (over 75%).

Tags: BlackBerry Developers

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