Panel sizing

[sjs]

I have the following code example. It contains a Frame, within the Frame is a TabbedPanel, and in the left tabbed panel is a SplitPane. The problem is the split panes are very small. I thought using the BorderLayout.CENTER when I added the split pane to the tabbed pane, would make the split pane use the full size. What needs to change in the code to get the split pane the full size?

Thanks for any help.

import java.awt.*;
import java.awt.event.*;

import javax.swing.*;
import javax.swing.border.*;

public class szTest extends JFrame {

        // Variables
        private JTabbedPane tabbedPane;
        private JPanel leftTabPane, rightTabPane;
        private JPanel leftSplitPane, rightSplitPane;
        private JSplitPane splitPane;

        // Constructor
        public szTest()
        {
                tabbedPane = new JTabbedPane();
    
                // left tab pane
                leftTabPane = new JPanel(false);
                tabbedPane.addTab("Left Tab", leftTabPane);
                leftTabPane.setBorder(new LineBorder(Color.blue, 3));

    
                // right tab pane
                rightTabPane = new JPanel(false);
                tabbedPane.addTab("Right Tab", rightTabPane);
                rightTabPane.setBorder(new LineBorder(Color.cyan, 3));
    

                //Create a split pane
                leftSplitPane = new JPanel(false);
                rightSplitPane = new JPanel(false);
                leftSplitPane.setBorder(new LineBorder(Color.green, 2));
                rightSplitPane.setBorder(new LineBorder(Color.red, 2));
                splitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, true,
                                           leftSplitPane, rightSplitPane);

                splitPane.setDividerLocation(0.5);
                splitPane.setResizeWeight(0.5);

                // add split pane to left tab panel
                leftTabPane.add(splitPane, BorderLayout.CENTER);

                // add the tabbed panel to the frame
                add(tabbedPane, BorderLayout.CENTER);

                //add WindowListener for closing frame and ending program
                addWindowListener(new WindowAdapter() {
                                public void windowClosed(WindowEvent e)
                                {
                                        System.exit(0);
                                }
                        }
                );
                this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        }       //End of Contructor

        public static void main(String args[]) {
                szTest sv = new szTest();
                Container contentPane = sv.getContentPane();
                sv.setTitle("Panel Size Test");
                sv.setSize(600, 400);
                sv.setLocation(400, 250);
                sv.setVisible(true);
                sv.setResizable(true);
        }

}               //End of Swing szTest Class.

[Fubarable]

I have the following code example. It contains a Frame, within the Frame is a TabbedPanel, and in the left tabbed panel is a SplitPane. The problem is the split panes are very small. I thought using the BorderLayout.CENTER when I added the split pane to the tabbed pane, would make the split pane use the full size.

Only if the container that the component being added in fact uses BorderLayout. I don't see where you have set the layout of any of your containers here.

[sjs]

Only if the container that the component being added in fact uses BorderLayout. I don't see where you have set the layout of any of your containers here.

I thought the content frame uses BorderLayout by default.

[sjs]

I thought the content frame uses BorderLayout by default.

I added:

leftTabPane.setLayout(new BorderLayout());

And everything was as expected. When did the default BorderLayout get reset?

[Fubarable]

I thought the content frame uses BorderLayout by default.

It does, but you're not adding the split pane directly to the content pane; you're adding it to a JPanel which uses FlowLayout by default.

[sjs]

It does, but you're not adding the split pane directly to the content pane; you're adding it to a JPanel which uses FlowLayout by default.

Thank you.