Updating Window Size. Please help

Question

Hi. I have a problem that I am encountering and was wondering if anyone might know of how to solve it... I have a class called CenteredFrame that extends JFrame, and other classes extends CenteredFrame. I want to be able change the size of the windows to accomodate font changes and only have scrollpane when needed (this is when the window is at its maximum size). Because each class extending CenteredFrame may have its own layouts and sizes, I returned a panel for JContentPane and placed that inside of the scrollpane. One problem I am having upon testing one class extending CenteredFrame is that when apply button is pressed for font changes, refreshFrame is called but the window does not resize properly until the apply button is clicked a second time. Does anyone have an idea how to fix this? A second problem is that some of the classes extending CenteredFrame does not appear properly, buttons may be out of place even though it looked fine before scrollpane was implemented. All ideas would be helpful. Thanks.
Here is the code
public class CenteredFrame extends JFrame implements WindowListener {
private JPanel mainPanel = new JPanel();
private JScrollPane centeredFrameScrollPane;
* Constructor
public CenteredFrame() {
super();
getContentPane().setLayout(new BorderLayout());
centeredFrameScrollPane = new JScrollPane(mainPanel);
super.getContentPane().add(centeredFrameScrollPane);
//mainPanel.setLayout(new GridLayout());
setDefaultCloseOperation(WindowConstants.DO_NOTHING_ON_CLOSE);
addWindowListener(this);
* Used as a local getContentPane method in order to allow for
* scollpane
public Container getContentPane() {
return mainPanel;
* This is used for resizing the windows if font or component sizes
* changes
public void refreshFrame() {
centeredFrameScrollPane.getViewport().setExtentSize
(centeredFrameScrollPane.getViewport().getViewSize());
pack();

Answer 1

I have not actualy tested it but how about invalidating and then packing the CenteredFrame's content pane before calling setExtentSize. If the content pane has not had its layout updated how does getViewSize know how big the content pane wants to be with the new fonts?
As you code stands the pack is probably updating the layout of the content pane and then the second time you press "Apply" the getViewSize returns the updated information and everything works.
Ian