How to capture the event in driver JSplitPane

Question

Hi all, i have some problem with the JSplitPane.
What i want to do is that:
i need to capture the event throw when the user press the button in the driver of the JSplitPane, this is because i want to know wich side of the splitpane is complet visible.
Thanks for your time!
Luca

Answer 1

I thought I would do up an example just for fun. As you drag the splitter bar the size of the two components and the splitter component is reported to the console along with the divider location. Interestinly, on my system (Windows XP, Java 1.41_02) when you move the bar downwards the divider location is consistantly two pixels past the height of the top component but when you drag the bar upwards the divider location and the height of the top component are the same.
Does anyone have any ideas why that would be?
Here is the test app:package splitPaneMonitor;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import javax.swing.JFrame;
import javax.swing.JSplitPane;
import javax.swing.JTextArea;
public class SplitPaneFrame extends JFrame implements PropertyChangeListener  {
     public SplitPaneFrame()  {
          super ("Split pane test");
          //  Create the components to show in the split pane
          myTopComponent = new JTextArea ("This is the top component", 10, 40);
          myBottomComponent = new JTextArea ("This is the bottom component", 15, 40);
          //  Create the split pane
          mySplitter = new JSplitPane (JSplitPane.VERTICAL_SPLIT , true, myTopComponent, myBottomComponent);
          mySplitter.addPropertyChangeListener(JSplitPane.DIVIDER_LOCATION_PROPERTY, this);
          getContentPane ().setLayout(new BorderLayout ());
          getContentPane ().add (mySplitter, BorderLayout.CENTER);
     public void propertyChange (PropertyChangeEvent evt) {
          if (evt.getPropertyName () == JSplitPane.DIVIDER_LOCATION_PROPERTY)  {
               System.out.println ("Split pane divider moved");
               Dimension size = myTopComponent.getSize ();
               System.out.println ("    The top component's size is: " + size.height +" h, "+ size.width + " w");
               myBottomComponent.getSize (size);
               System.out.println ("    The bottom component's size is: " + size.height +" h, "+ size.width + " w");
               mySplitter.getSize (size);
               System.out.println ("    The splitter's size is: " + size.height +" h, "+ size.width + " w");
               System.out.println ("    The splitter divider location is: " + mySplitter.getDividerLocation ());
     private JTextArea myTopComponent;
     private JTextArea myBottomComponent;
     private JSplitPane mySplitter;
     public static void main(String[] args) {
          SplitPaneFrame appFrame = new SplitPaneFrame ();
          appFrame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
          appFrame.pack();
          appFrame.setVisible (true);          
}