please help

[catherine matthews]

My problem is that,
i have a tabbed pane, within that have several nested panes...
I need to add a scroll pane to one of the nested panes... I tried this way but not working... please help...

 
panCoupling = new JPanel();
taCoupling = new JTextArea(60,70);
taCoupling.setEditable(false);   
panCoupling.add( new JScrollPane(taCoupling));
tabpan2.addTab("CBO", null,panCoupling, "Cohesion between objects");
tabpan.addTab("CK metric ", null,tabpan2, "Chidamber-Kemerer (CK)");
c.add(tabpan);
// c is the container....
 

i still do not see any scroll pane... whre is my mistake please help

[shansi raj]

Try doing this

tabpan = new javax.swing.JTabbedPane();
tabpan2 = new javax.swing.JTabbedPane();
panCoupling = new javax.swing.JPanel();
scrollPane = new javax.swing.JScrollPane();
textArea = new javax.swing.JTextArea();

setLayout(new java.awt.BorderLayout());

scrollPane.setPreferredSize(new java.awt.Dimension(200, 200));
scrollPane.setViewportView(textArea);

panCoupling.add(scrollPane);

tabpan2.addTab("CBO", panCoupling);

tabpan.addTab("tab1", tabpan2);

add(tabpan, java.awt.BorderLayout.CENTER);

[Craig Wood]

import java.awt.*;
import javax.swing.*;
 
public class Options
{
    private JTabbedPane getTabbedPane()
    {
        JTabbedPane tabbedPane = new JTabbedPane();
        tabbedPane.addTab("first",  getScrollPaneContainer());
        tabbedPane.addTab("second", getFlowLayoutPanel());
        tabbedPane.addTab("third",  getBorderLayoutPanel());
        tabbedPane.addTab("fourth", getGridBagLayoutPanel());
        return tabbedPane;
    }
 
    /**
     * The JScrollPane will be the size of the parent JTabbedPane
     * and will be able to properly display its child JTextField.
     * The JTabbedPane layout manager behaves like BorderLayout
     * in the way it expands its child to fill the available space.
     */
    private JTabbedPane getScrollPaneContainer()
    {
        JTabbedPane tabbedPane = new JTabbedPane();
        tabbedPane.addTab("scrollPane container",
                           new JScrollPane(new JTextArea(60,70)));
        return tabbedPane;
    }
 
    /**
     * FlowLayout attempts to display its child JScollPane at its
     * preferredSize. But the JScrollpane (not having its preferredSize
     * set), by default, becomes the preferredSize of its child
     * JTextArea. FlowLayout has not given/enforced any size constraints
     * on the child JScrollPane and allows it to be any size.
     * One drawback of FlowLayout is that it does not report the size of
     * any non-visible portion of its child components. So if part of its
     * children are not visible/don't fit, FlowLayout does not report 
     * their size - they're ignored by the layout manager.
     * The JScrollPane needs some parental boundry guidance for it to know
     * what size it can be and it uses this information along with the size
     * information of its child/view component to properly set its ScrollBars.
     * Therefore, FlowLayout is a poor choice for this situation. Better
     * choices might be BorderLayout, GridLayout and GridBagLayout.
     */
    private JTabbedPane getFlowLayoutPanel()
    {
        JPanel panel = new JPanel();
        panel.add(new JScrollPane(new JTextArea(60,70)));
        JTabbedPane tabbedPane = new JTabbedPane();
        tabbedPane.addTab("panel with FlowLayout", panel);
        return tabbedPane;
    }
 
    /**
     * BorderLayout causes the child JScrollPane to expand to fill the
     * available space. It can then set its ScrollBars to properly
     * display its child JTextArea.
     */
    private JTabbedPane getBorderLayoutPanel()
    {
        JPanel panel = new JPanel(new BorderLayout());
        panel.add(new JScrollPane(new JTextArea(60,70)));
        JTabbedPane tabbedPane = new JTabbedPane();
        tabbedPane.addTab("panel with BorderLayout", panel);
        return tabbedPane;
    }
 
    /**
     * GridBagLayout works okay if we tell it to expand its children
     * to fill their parent conatiner. Otherwise it trys to show its
     * child JSctollPane at its preferredSize which is the size of the
     * JScrollPanes child JTextArea (by default). Since this won't fit
     * in the JPanel parent the JScrollPane collapses (vs. FlowLayouts
     * way of letting it run over and ignoring what doesn't fit).
     * For the fill constraint to work properly the corresponding weight
     * constraint(s) must be non-zero.
     */
    private JTabbedPane getGridBagLayoutPanel()
    {
        JPanel panel = new JPanel(new GridBagLayout());
        GridBagConstraints gbc = new GridBagConstraints();
        gbc.weightx = 1.0;
        gbc.weighty = 1.0;
        gbc.fill = GridBagConstraints.BOTH;
        panel.add(new JScrollPane(new JTextArea(60,70)), gbc);
        JTabbedPane tabbedPane = new JTabbedPane();
        tabbedPane.addTab("panel with GridBagLayout", panel);
        return tabbedPane;
    }
 
    public static void main(String[] args)
    {
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setContentPane(new Options().getTabbedPane());
        f.setSize(400,400);
        f.setLocation(200,200);
        f.setVisible(true);
    }
}