In Lwuit, How to handle Keypad navigation Events?

Question

In the application I'm building I have Tabs and a list in for each Tab. the behavior I want is when I press the Left/Right Nav Key the selected Tab will change. when I press the Up/Down Nav Key the List will change selection index.

I used LWUIT GUI builder to generate StateMachine/StateMachineBase class.

I've been trying to fix this all day. please help.

Answer 1

Pheromix's answer is correct but he didn't account for the UIBuilder. To override the Form creation in the UIBuilder override the method:

protected Component createComponentInstance(String componentType, Class cls) {
    if(cls == com.sun.lwuit.Form.class) {
        return new MyFormSubclass();
    }
    return super.createComponentInstance(componentType, cls);
}

There is an option to override the Tab selection behavior but to get the most accurate behavior this might be the best approach.

Answer 2

Why do you complicate your life ? Just use keyReleased method implementation in your class. Make a test :

if (display.getGameAction(keyCode) == Display.GAME_LEFT || display.getGameAction(keyCode) == Display.GAME_RIGHT)
{
    if (tab.getSelectedIndex == 0)
        tab.setSelectedIndex(1);
    else
        tab.setSelectedIndex(0);
}
else if (display.getGameAction(keyCode) == Display.GAME_UP || display.getGameAction(keyCode) == Display.GAME_DOWN)
{
    if (list.hasFocus())
        super.keyReleased(keyCode);
}