Problem with split panes

[Arman Charif]

Hi there,

I have a simple class that splits the window into four parts using JSplitPanes.

The problem: In the constructor I set the location of split pane dividers. Works fine.

But if i call one of the set methods (to update whats on the screen) the values i set in the constructor get reset to default values. Even if I manually resize the split panes, calling the set method resets the values..

Any suggestions? All comments will be appreciated.

Arman

 
public class Frames extends JPanel {
 
    /** Left vertical split pane */
    private JSplitPane left;
    
    /** Right vertical split pane */
    private JSplitPane right;
    
    /** Left-right divider */
    private JSplitPane divider;
    
    
    
    /**
     * Class constructor taking four <code>java.awt.Component</code>s
     * as its arguments.
     * 
     * @param tl top-left component.
     * @param bl bottom-left component.
     * @param tr top-right component.
     * @param br bottom-right component.
     */
    public Frames(Component tl, Component bl, Component tr, Component br) {
        
        super(new BorderLayout());
        
        left = new JSplitPane(JSplitPane.VERTICAL_SPLIT, tl, bl);
        right = new JSplitPane(JSplitPane.VERTICAL_SPLIT, tr, br);
 
        // XXX: This is the problem. If a set method is called these
        left.setDividerLocation(200);   // values will be reset to
        right.setDividerLocation(250);  // some default values.
        
        divider = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, left, right);
        
        add(divider, BorderLayout.CENTER);
    }
    
    
    /**
     * Returns top left component.
     * @return top left component.
     */
    public Component getTopLeftView() {
        return left.getTopComponent();
    }
    
    /**
     * Sets top left component.
     * @param c component to set.
     */
    public void setTopLeftView(Component c) {
        left.setTopComponent(c);
        left.setDividerLocation(leftDivider);
    }
    
    /**
     * Returns top right component.
     * @return top right component.
     */
    public Component getTopRightView() {
        return right.getTopComponent();
    }
    
    /**
     * Sets top right component.
     * @param c component to set,
     */
    public void setTopRightView(Component c) {
        right.setTopComponent(c);
        right.setDividerLocation(rightDivider);
    }
    
    /**
     * Returns bottom left component.
     * @return bottom left component.
     */
    public Component getBottomLeftView() {
        return left.getBottomComponent();
    }
    
    /**
     * Sets bottom left component.
     * @param c component to set,
     */
    public void setBottomLeftView(Component c) {
        left.setBottomComponent(c);
    }
    
    /**
     * Returns bottom right component.
     * @return bottom right component.
     */
    public Component getBottomRightView() {
        return right.getBottomComponent();
    }
    
    /**
     * Sets bottom right component.
     * @param c component to set.
     */
    public void setBottomRightView(Component c) {
        right.setBottomComponent(c);
    }
    
}
 
  

[Rachel Swailes]

Hi there

I found that I had the same problem when using the setDividerLocation(int). Then I tried setting the DividerLocation with the other method that takes a double. Then I made the frame that holds the splitpane listen for the resize events on the frame and then I call a resize method that basically resets the dividerLocation with the same methods that accepts a double.
It's working without a problem now.

Cheers,
Rachel
[ July 12, 2004: Message edited by: Rachel Swailes ]

[Arman Charif]

Hi Rachel,

Which listener did you use to detect changes in divider location?
Could you paste some sample code?

A.

[Arman Charif]

I was struggling with the split pane divider problem (see my post above) for a good few hours. Now it seems that i found a simple solution. I'm going to post it in case someone else comes accross the same problem.

Any further comments, if any, are welcome..

The final code:

 
import java.awt.BorderLayout;
import java.awt.Component;
 
import javax.swing.JPanel;
import javax.swing.JSplitPane;
 
/**
 * A class responsible for managing frame contents.
 * 
 * @authorArman Charif
 * @version12-Jul-2004
 */
public class Frames extends JPanel {
    
    private JPanel topLeft;
    private JPanel topRight;
    private JPanel bottomLeft;
    private JPanel bottomRight;
    
    
    /**
     * Class constructor taking four <code>java.awt.Component</code>s
     * as its arguments.
     * 
     * @param tl top-left component.
     * @param bl bottom-left component.
     * @param tr top-right component.
     * @param br bottom-right component.
     */
    public Frames(Component tl, Component bl, Component tr, Component br) {
        
        super(new BorderLayout());
        initPanels(tl, bl, tr, br);
        
        JSplitPane left, right, divider;
        
        left = new JSplitPane(JSplitPane.VERTICAL_SPLIT, topLeft, bottomLeft);
        left.setDividerLocation(230);
        
        right = new JSplitPane(JSplitPane.VERTICAL_SPLIT, topRight, bottomRight);
        right.setDividerLocation(250);
        
        left.setDividerSize(2);
        right.setDividerSize(2);
        
        divider = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, left, right);
        
        add(divider, BorderLayout.CENTER);
    }
    
    
    /**
     * Returns top left component.
     * @return top left component.
     */
    public Component getTopLeftView() {
        return topLeft;
    }
    
    /**
     * Sets top left component.
     * @param c component to set.
     */
    public void setTopLeftView(Component c) {
        topLeft.add(c, BorderLayout.CENTER);
    }
    
    /**
     * Returns top right component.
     * @return top right component.
     */
    public Component getTopRightView() {
        return topRight;
    }
    
    /**
     * Sets top right component.
     * @param c component to set,
     */
    public void setTopRightView(Component c) {
        topRight.add(c, BorderLayout.CENTER);
    }
    
    /**
     * Returns bottom left component.
     * @return bottom left component.
     */
    public Component getBottomLeftView() {
        return bottomLeft;
    }
    
    /**
     * Sets bottom left component.
     * @param c component to set,
     */
    public void setBottomLeftView(Component c) {
        bottomLeft.add(c, BorderLayout.CENTER);
    }
    
    /**
     * Returns bottom right component.
     * @return bottom right component.
     */
    public Component getBottomRightView() {
        return bottomRight;
    }
    
    /**
     * Sets bottom right component.
     * @param c component to set.
     */
    public void setBottomRightView(Component c) {
        bottomRight.add(c, BorderLayout.CENTER);
    }
    
    
    // -------------------------------------------------
    // ------------------ Private ----------------------
    // -------------------------------------------------
    
    /*
     * Initialises panels.
     * 
     * @param tl top-left component.
     * @param bl bottom-left component.
     * @param tr top-right component.
     * @param br bottom-right component.
     */
    private void initPanels
    (Component tl, Component bl, Component tr, Component br) {
        
        topLeft= new JPanel(new BorderLayout());
        topRight= new JPanel(new BorderLayout());
        bottomLeft= new JPanel(new BorderLayout());
        bottomRight= new JPanel(new BorderLayout());
        
        topLeft.add(tl, BorderLayout.CENTER);
        topRight.add(tr, BorderLayout.CENTER);
        bottomLeft.add(bl, BorderLayout.CENTER);
        bottomRight.add(br, BorderLayout.CENTER);
    }
    
}