How to size jsplitpane?

[Kay Tracid]

Hi,
I have a JFrame with a JPanel. This JPanel contains a JSplitpane, wich has alwasy the size of the JPanel. I need to size the Splitpane to the size of the JFrame... how can i do this?
The JSplitpane only "knows" the size of the JPanel, but not of the JFrame.
Please help...I tried a lot, but found no solution.
Thanks lot!

[Rene Liebmann]

It seems to me, that you want to show your frame in the same size like the splitpane? If this is so, then you can try JFrame.pack().

[Kay Tracid]

no, i want the jsplitpane to have the size of the frame. my problem is the splitpane is in a panel and this panel dont know the size of the frame where its added.

thanks....

[Rene Liebmann]

Which kind of LayoutManagers do you use?
For example if your Frame (ContentPane) has BorderLayout and you add a JPanel to the Center, then it has the same size like your Frame. And if Your Panel has also BorderLayout and your JSplitPane is added to the center, then it will have also the same size like your Frame.
But maybe you have some other components to show??? You shoud give us a bit code. This makes our thoughts a bit easier. Maybe not the whole application, only the skeleton (GUI).

[Kay Tracid]

ok, here is the gui in a simple way. i wrote it for you to understand and in addition to that i solved my problem :-) But i have another problem with "splitPane.setDividerLocation(0.5);", because there is no effect. the divider should be in the middle and i want to use percentage. Can you help, please? thanks!

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class GUITest extends JFrame
{
  private Container mainContent;
  private JTabbedPane tabbedPane = new JTabbedPane();
  
  public GUITest (String Title)
  {
    super (Title);
    addWindowListener(new WindowAdapter()
    {
      public void windowClosing (WindowEvent evt) {System.exit(0);}
    });
    mainContent = this.getContentPane();
    setSize(getToolkit().getScreenSize().width, getToolkit().getScreenSize().height-28);
    tabbedPane.add("first", new MainPanel());
    tabbedPane.add("second", new MainPanel());
    mainContent.add("Center", tabbedPane);
  }

  public static void main (String args[])
  {
    new GUITest("GUITest").setVisible(true);
  }
}
class DataPanel extends JPanel
{
  private GridBagLayout gbLayout = new GridBagLayout();
  private GridBagConstraints gbc = new GridBagConstraints();
  private JButton b1 = new JButton("Test1Button");
  private JButton b2 = new JButton("Test2Button");
  private JButton b3 = new JButton("Test3Button");
  private JTextField tf1 = new JTextField(10);
  private JTextField tf2 = new JTextField(10);
  private JTextField tf3 = new JTextField(10);
  private JLabel l1 = new JLabel("Label 1");
  private JLabel l2 = new JLabel("Label 2");
  private JLabel l3 = new JLabel("Label 3");
  
  public DataPanel()
  {
    gbc.anchor = GridBagConstraints.NORTHWEST;
    gbc.insets = new Insets(10,10,5,5);
    add2Layout(gbLayout, gbc, 0, 0, l1);
    add2Layout(gbLayout, gbc, 1, 0, tf1);
    add2Layout(gbLayout, gbc, 2, 0, b1);
    add2Layout(gbLayout, gbc, 0, 1, l2);
    add2Layout(gbLayout, gbc, 1, 1, tf2);
    add2Layout(gbLayout, gbc, 2, 1, b2);
    add2Layout(gbLayout, gbc, 0, 2, l3);
    add2Layout(gbLayout, gbc, 1, 2, tf3);
    add2Layout(gbLayout, gbc, 2, 2, b3);
    setLayout(gbLayout);
    this.add(l1);
    this.add(tf1);
    this.add(b1);
    this.add(l2);
    this.add(tf2);
    this.add(b2);
    this.add(l3);
    this.add(tf3);
    this.add(b3);
  }
  public void add2Layout(GridBagLayout gbLayout, GridBagConstraints constraints, int x, int y, JComponent comp)
  {
    constraints.gridx = x;
    constraints.gridy = y;
    gbLayout.setConstraints(comp, constraints);
  }
}
class PicPanel extends JPanel
{
  private JLabel l1 = new JLabel("picture should be here");
  private GridBagLayout gbLayout = new GridBagLayout();
  private GridBagConstraints gbc = new GridBagConstraints();
  public PicPanel()
  {
    gbc.gridx = 0;
    gbc.gridy = 0;
    gbLayout.setConstraints(l1, gbc);
    setLayout(gbLayout);
    add(l1);
  }
}
class MainPanel extends JPanel
{
  private DataPanel dataPanel = new DataPanel();
  private PicPanel picPanel = new PicPanel();
  private JScrollPane dataPane = new JScrollPane(dataPanel);
  private JScrollPane picPane = new JScrollPane(picPanel);
  private JSplitPane splitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, dataPane, picPane);
  public MainPanel()
  {
    setLayout(new BorderLayout());
    splitPane.setDividerLocation(0.5);
    splitPane.setOneTouchExpandable(true);
    dataPane.setBorder(null);
    picPane.setBorder(null);
    add(splitPane);
  }
}

[Rene Liebmann]

Yes, you missed something. It is only possible to call setDividerLocation(0.5) when the JFrame is already opened. So you have to listen for this event.
Here is a little example:

  
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class SimpleSplitPaneTest extends JFrame {
  JSplitPane jSplitPane1 = new JSplitPane();
  JPanel jPanel1 = new JPanel();
  JPanel jPanel2 = new JPanel();
  public SimpleSplitPaneTest() {
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }
  public static void main(String[] args) {
    SimpleSplitPaneTest splitPaneTest1 = new SimpleSplitPaneTest();
    splitPaneTest1.setSize(500,300);
    //splitPaneTest1.pack();
    splitPaneTest1.show();
  }
  private void jbInit() throws Exception {
    this.addWindowListener(new java.awt.event.WindowAdapter() {
      public void windowOpened(WindowEvent e) {
        this_windowOpened(e);
      }
    });
    this.getContentPane().add(jSplitPane1, BorderLayout.CENTER);
    jSplitPane1.add(jPanel1, JSplitPane.LEFT);
    jSplitPane1.add(jPanel2, JSplitPane.RIGHT);
    
  }

  void this_windowOpened(WindowEvent e) {
    this.jSplitPane1.setDividerLocation(0.5);
  }
}

Hope this helps
Rene
[ June 26, 2002: Message edited by: Rene Liebmann ]

[Kay Tracid]

ok, thanks, i understand, but how can i do this for my splitpane in the panel?
regards kay

[Rene Liebmann]

This is easy. Your SplitPane exists in your Class MainPanel. And you create your MainPanel instance in your Frame. So your MainPanel should implement
the WindowListener interface. Then you add your instance of MainPanel as a WindowListener to your Frame.
Or (a bit easier) you make it in a different way. You could add a method setParentFrame(JFrame frame) to your MainPanel class. This method could look like:

  
public void setParentFrame(JFrame frame) {
frame.addWindowListener(new java.awt.event.WindowAdapter() {      public void windowOpened(WindowEvent e) {        
splitPane.setDividerLocation(0.5);
}    });
}

Do you understand the Idea? It doesn't matter where you catch the windowOpened Event. You can do it where ever you know your Frame.
Bye
Rene

[Kay Tracid]

Thanks it works fine!