How to change the size of any field?

Hello, I'm developing a CLDC Application on JDE 4.7, and I have a problem while I create a custom field (no field, NullField, VertivalFieldManaher, LabalField, etc.). I do an override of the method getPreferredWidth() or getPreferredHeight() to set the new height and width of my field, but when printing, a string to the console in the painting of the method, I don't see that this painting of the method is executed in a cycle.

This an expmple of code:

public class ExpanderField extends VerticalFieldManager {
    public int getPreferredHeight() {
        return 200;
    }

    public int getPreferredWidth() {
        return 200;
    }

    protected void subpaint(Graphics graphics) {
        //super.paint(graphics);
        System.out.println("Paint Method Executed");
    }

    protected void sublayout(int width, int height) {
        super.sublayout(getPreferredWidth(), getPreferredHeight());
        super.setExtent(getPreferredWidth(), getPreferredHeight());
        System.out.println("layout executed...");
    }

}// ExpanderField class

In this example, the string "Painting executed method" is printed permanently. I don't know why the method of painting is executed all the time.

Anyone know what is happen?

I think I found the answer. In another class of my project, I put the setPosition() sentence; in the method object of a VerticalFieldManager and this sentence call once again, the paint so this method to cycle, and all fields checked for this VerticalFieldManager are painted, once again what is run the paint method in the VerticalFieldManager.

But I have a question for developers RIM...

http://www.BlackBerry.com/knowledgecenterpublic/livelink.exe/fetch/2000/348583/800332/800505/800345/...

Why in the code example above, you use the setPosition() phrases; and getManager () .invalidate (); within the method object?, this sentences call the Paint method constantly and never stop, it is not an effective way to program an application.

Tags: BlackBerry Developers

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