Can't get scroll panes to scroll

Question

Hi,
I have tabbed pane which have scroll panes which have (for each) a pane that has a known number of JLabels. The size of the tabbed pane and scroll panes are fixed, but the size of panes that are contained in them changes. I expected that when the size of panes become bigger then the size of the scroll pane a scroll bar would occur and do its job. But that does not happen. I use setSize method to set the size of the panes(not the scroll panes), which works fine.( I displayed the pane in a seperate window to check if it works.)
Have any ideas what I am missing?

Answer 1

My apologies.
I am using NetBeans, and didn't change the code it created for GUI. I am inclined to beleive that it does not make errors when creating GUI components.
Here is the method I use to populate one pane.
    public void listOffline() {
        // Clear the panel and set its size.
           // offlinePanel is the pane inside the scrollpane.
           offlinePanel.removeAll();
        offlinePanel.setSize(200, 20*offlineList.size());
        //offlinePane.setSize(200, 20*offlineList.size());
        // I need a list of strings to display.
        String[] ListString= arrayToStr(offlineList);
        int au=0;
        JLabel tempLabel;
        // Populate the list.
        for(int ii=0; ii < ListString.length; ii++) {
            // Add item number.
            if (ii%2 == 0){
                  tempLabel = new JLabel((ii/2 + 1) + ". " + ListString[ii]);
             else {
                  tempLabel=new JLabel(ListString[ii]);
            offlinePanel.add(tempLabel);
            tempLabel.setLocation(20,20*ii);
            tempLabel.setSize(200,20);
            // Name is in blue.
            if(au%2==0) {
                tempLabel.setForeground(java.awt.Color.BLUE);
            // Address is in green.
            else {
                tempLabel.setForeground(new java.awt.Color(0,140,0));
                tempLabel.setText("ftp://" + tempLabel.getText());
                final String temp = tempLabel.getText();
                // Open address in default browser if clicked.
                tempLabel.setCursor(java.awt.Cursor.getPredefinedCursor(12));
                tempLabel.addMouseListener(new java.awt.event.MouseAdapter() {
                    @Override
                    public void mouseClicked(java.awt.event.MouseEvent evt) {
                        try {
                            Runtime.getRuntime().exec(new String[]{"cmd", "/c", "start " + temp});
                        catch (Exception e) {
                            JOptionPane.showMessageDialog(null, "Error opening browser.");
            au++;
        ListString = null;
    }Edited by: acsabir on Oct 23, 2008 1:50 AM