Using panels
To: comp.lang.java.gui
I'm writing a small program for my own use and I've run into a problem I
don't completely understand. I don't have a lot of experience with Swing
and it is a big API, so please forgive the simplicity of the solution that
I'm sure exists.
In the application I wish to have a single pane split into three parts
with each part covered by a panel (or maybe a scrollpane) that holds the
actual components. These components are added dynamically at run time
based on the internal state of the program.
Unfortunately when I add a panel to the panel that sits in the split pane
I don't see anything. There isn't an error or an exception, just no
display. I've played around with it a bit, but I can't seem to get it to
work.
I've put together a small example that uses two classes that shows the
problem I'm having. I'll include the classes below. These were put
together in NetBeans so they are a little bit more complex than necessary,
but the added complexity can be ignored for the most part.
The basic problem is that I'm adding the ChoreHeaderPanel to the jPanel1
and I'm not getting anything in the display.
Thanks.
--
Kenneth P. Turvey <kt-usenet@squeakydolphin.com>
XMPP: kpturvey@jabber.org
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/*
* PanelTest.java
*
* Created on May 2, 2007, 6:47 PM
*/
package com.squeakydolphin.tokentracker;
import javax.swing.JPanel;
/**
*
* @author kt
*/
public class PanelTest extends javax.swing.JFrame {
/** Creates new form PanelTest */
public PanelTest() {
initComponents();
JPanel panel = new ChoreHeaderPanel();
jPanel1.add(panel);
jPanel1.validate();
}
/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
*/
// <editor-fold defaultstate="collapsed" desc=" Generated Code ">
private void initComponents() {
jSplitPane1 = new javax.swing.JSplitPane();
jPanel1 = new javax.swing.JPanel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 314, Short.MAX_VALUE)
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 298, Short.MAX_VALUE)
);
jSplitPane1.setRightComponent(jPanel1);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jSplitPane1, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, 427, Short.MAX_VALUE)
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jSplitPane1, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, 300, Short.MAX_VALUE)
);
pack();
}// </editor-fold>
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new PanelTest().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JPanel jPanel1;
private javax.swing.JSplitPane jSplitPane1;
// End of variables declaration
}
-------------------------------------------------------
/*
* ChoreHeaderPanel.java
*
* Created on May 1, 2007, 12:20 PM
*/
package com.squeakydolphin.tokentracker;
/**
*
* @author kt
*/
public class ChoreHeaderPanel extends javax.swing.JPanel {
/** Creates new form ChoreHeaderPanel */
public ChoreHeaderPanel() {
initComponents();
}
/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
*/
// <editor-fold defaultstate="collapsed" desc=" Generated Code ">
private void initComponents() {
jLabel1 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
jLabel3 = new javax.swing.JLabel();
setBorder(javax.swing.BorderFactory.createLineBorder(new java.awt.Color(0, 0, 0)));
setMinimumSize(new java.awt.Dimension(100, 35));
jLabel1.setText("Chores");
jLabel2.setText("Red");
jLabel3.setText("White");
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
this.setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 76, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(50, 50, 50)
.addComponent(jLabel2, javax.swing.GroupLayout.PREFERRED_SIZE, 37, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(0, 0, 0)
.addComponent(jLabel3)
.addContainerGap(304, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel2)
.addComponent(jLabel3)
.addComponent(jLabel1))
.addContainerGap(18, Short.MAX_VALUE))
);
}// </editor-fold>
// Variables declaration - do not modify
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
// End of variables declaration
}
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