How to ticker List elements when they are Commands? - java-me

Question

If I create a List based on an array of Commands, and the text of some Commands are not entirely shown in the List, although the List preferredWidth is set to the Form preferredWidth, how to ticker them ?
Thank you very much

Answer 1

Add the below class in your midlet class or create a new class file for that:
class TickerRenderer extends DefaultListCellRenderer {
private DefaultListCellRenderer selectedRenderer = new DefaultListCellRenderer(false);
private List parentList;
public TickerRenderer() {
super(false);
}
public boolean animate() {
if (parentList != null && parentList.getComponentForm() != null) {
if (selectedRenderer.isTickerRunning()) {
if (selectedRenderer.animate()) {
parentList.repaint();
}
}
}
return super.animate();
}
public Component getListCellRendererComponent(List list, Object value, int index, boolean isSelected) {
if (isSelected) {
selectedRenderer.getListCellRendererComponent(list, value, index, isSelected);
// sometimes the list asks for a dummy selected value for size calculations and this might
// break the tickering state
if (index == list.getSelectedIndex()) {
if (selectedRenderer.shouldTickerStart()) {
if (!selectedRenderer.isTickerRunning()) {
parentList = list;
list.getComponentForm().registerAnimated(this);
selectedRenderer.startTicker(UIManager.getInstance().getLookAndFeel().getTickerSpeed(), true);
}
} else {
if (selectedRenderer.isTickerRunning()) {
selectedRenderer.stopTicker();
}
}
}
return selectedRenderer;
} else {
return super.getListCellRendererComponent(list, value, index, isSelected);
}
}
}
Use it like this:
List cmdList = new List(cmds);
cmdList.setListCellRenderer(new TickerRenderer());

Answer 2

Try this code, it will show list in dialog box on clicking "Show list" command and will also enable ticker initially. Below is the code which shows how to use the above mentioned class to see ticker in list when list is contained in dialog.
Don't forget to make your list final so that it can be used in inner classes.
form.addCommand(new Command("Show list") { // add command in form and override its actionPerformed method
public void actionPerformed(ActionEvent evt) {
Dialog d = new Dialog() { // create an instance of dialog and make it an inner class so that you can override onShow() method and set focus on list when dialog gets initialized and also can set its index to ur preferred one (here it's 0)
protected void onShow() { // overriding of onShow() method
list.requestFocus(); // set focus on list
list.setSelectedIndex(0); // set selected index to 0
}
};
d.addComponent(list); // add list in dialog
d.show(); // show dialog
}
});
This code shows my list in dialog and starts ticker initially. If it doesn't help, post your code, i will try to see it.