Cannot add to a JPanel after that removeAll() is triggered by an another swing zo
Examine the piece of code below. This is a much simplified version of my real application.JPanel1 is a unique label. JPanel2 is a single button.
The jPanel2 button is supposed to erase claire (with removeAll()) jPanel1 and add a new label in place of the old. What actually happens, is that after the first button press, jPanel1 is indeed allowed by the removeAll() method but cannot add the new label (or rather it can be added, but will not appear.) I can hardcode the withdrawal and adding back all day and it works great. It is only when I use a component swing as JButton or JComboBox that it does not work. Why? What is a thread thing? (I know I can just change the text of the label, but the real app is much more complicated).
package my.stuff;
import java.awt.*;
import javax.swing.*;
public class TreeTest3 extends javax.swing.JFrame {
private String language = "english";
public TreeTest3() {
initComponents();
jPanel1.setLayout(new FlowLayout());
jPanel1.setVisible(true);
changeLabel();
}
private void changeLabel()
{
System.out.println("language = " + language);
jPanel1.removeAll();
jPanel1.validate();
jPanel1.add(new JLabel(language), "Center");
repaint();
}
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jPanel1 = new javax.swing.JPanel();
jPanel2 = new javax.swing.JPanel();
jButton1 = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jPanel1.setBorder(new javax.swing.border.MatteBorder(null));
jPanel1.setPreferredSize(new java.awt.Dimension(400, 204));
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 398, Short.MAX_VALUE)
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 133, Short.MAX_VALUE)
);
jButton1.setText("switch");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2);
jPanel2.setLayout(jPanel2Layout);
jPanel2Layout.setHorizontalGroup(
jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel2Layout.createSequentialGroup()
.addContainerGap()
.addComponent(jButton1)
.addContainerGap(308, Short.MAX_VALUE))
);
jPanel2Layout.setVerticalGroup(
jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel2Layout.createSequentialGroup()
.addContainerGap()
.addComponent(jButton1)
.addContainerGap(126, Short.MAX_VALUE))
);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jPanel2, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, 135, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jPanel2, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
if (language.equals("english")) language = "spanish"; else language = "english";
changeLabel();
}
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new TreeTest3().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton jButton1;
private javax.swing.JPanel jPanel1;
private javax.swing.JPanel jPanel2;
// End of variables declaration
}
It should be
private void changeLabel()
{
System.out.println("language = " + language);
jPanel1.removeAll();
jPanel1.add(new JLabel(language), "Center");
jPanel1.revalidate();
jPanel1.repaint();
}
Tags: Java
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Can embed you fonts in a pdf file after that the pdf has been created? I received a PDF of an another designer, made a few minor corrections, and now the printer cannot be used because the original pdf didn't have all fonts embedded. Any ideas?
Use the Acrobat Pro preflight!
To incorporate the missing fonts in Acrobat Preflight profile will incorporate the missing fonts in your PDF file assuming that:
(1) the fonts in question are installed on your system and
(2) the police themselves is not protected against the incorporation (they can at least see and print incorporation.
-Dov
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