I am trying to make a graphical interface in Java with Netbeans. I use a JFrame Form. Inside it, a JScrollPane contains a JPanel. Within the JScrollPane, assigned the property verticalScrollBarPolicy the value "AS_NEEDED" in order to scroll only if the content is too large.
But my problem is that the vertical scrollbar is present from the start of the application. How to solve it?
I put the setLayout method on my JPanel in my constructor (which was before in my jMenuItem1ActionPerformed method), and it seems to work.
However, i have another small problem. when I open few files, a gap that is much too big separates them (which is not the case when there are many files).
Below, the visual IHM, the properties of JPanel and JScrollPane and the code produced.
public class Items_IHM extends javax.swing.JFrame {
JCheckBox checkBox;
List<JCheckBox> listOfCheckBox = new ArrayList<>();
File[] allFiles;
File folder;
/**
* Creates new form Items_IHM
*/
public Items_IHM() {
initComponents();
panel.setLayout(new GridLayout(0, 1, 10, 10));
this.setLocationRelativeTo(null);
}
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents
private void initComponents() {
srollPane = new javax.swing.JScrollPane();
panel = new javax.swing.JPanel();
buttonExecute = new javax.swing.JButton();
jMenuBar1 = new javax.swing.JMenuBar();
jMenu1 = new javax.swing.JMenu();
jMenuItem1 = new javax.swing.JMenuItem();
jMenuItem2 = new javax.swing.JMenuItem();
jMenu2 = new javax.swing.JMenu();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
srollPane.setHorizontalScrollBarPolicy(javax.swing.ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
srollPane.setMinimumSize(new java.awt.Dimension(300, 400));
srollPane.setPreferredSize(new java.awt.Dimension(200, 300));
javax.swing.GroupLayout panelLayout = new javax.swing.GroupLayout(panel);
panel.setLayout(panelLayout);
panelLayout.setHorizontalGroup(
panelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 339, Short.MAX_VALUE)
);
panelLayout.setVerticalGroup(
panelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 477, Short.MAX_VALUE)
);
srollPane.setViewportView(panel);
buttonExecute.setText("Execute");
buttonExecute.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
buttonExecuteActionPerformed(evt);
}
});
jMenu1.setText("Fichier");
jMenuItem1.setAccelerator(javax.swing.KeyStroke.getKeyStroke(java.awt.event.KeyEvent.VK_O, java.awt.event.InputEvent.CTRL_MASK));
jMenuItem1.setText("Ouvrir");
jMenuItem1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jMenuItem1ActionPerformed(evt);
}
});
jMenu1.add(jMenuItem1);
jMenuItem2.setAccelerator(javax.swing.KeyStroke.getKeyStroke(java.awt.event.KeyEvent.VK_Q, java.awt.event.InputEvent.CTRL_MASK));
jMenuItem2.setText("Quitter");
jMenuItem2.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jMenuItem2ActionPerformed(evt);
}
});
jMenu1.add(jMenuItem2);
jMenuBar1.add(jMenu1);
jMenu2.setText("Editer");
jMenuBar1.add(jMenu2);
setJMenuBar(jMenuBar1);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(buttonExecute, javax.swing.GroupLayout.PREFERRED_SIZE, 90, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap())
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(srollPane, javax.swing.GroupLayout.PREFERRED_SIZE, 341, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(99, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(srollPane, javax.swing.GroupLayout.PREFERRED_SIZE, 479, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(buttonExecute, javax.swing.GroupLayout.DEFAULT_SIZE, 31, Short.MAX_VALUE)
.addContainerGap())
);
pack();
}// </editor-fold>//GEN-END:initComponents
private void jMenuItem1ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jMenuItem1ActionPerformed
Preferences preferences = Preferences.userRoot();
String path = preferences.get("DEFAULT_PATH", "");
JFileChooser fileChooser = new JFileChooser();
fileChooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
fileChooser.setCurrentDirectory(new File(path));
int returnVal = fileChooser.showOpenDialog(null);
if (returnVal == JFileChooser.APPROVE_OPTION) {
// allNameFilesTextArea.setText("");
folder = fileChooser.getSelectedFile();
fileChooser.setCurrentDirectory(folder);
preferences.put("DEFAULT_PATH", folder.getAbsolutePath());
allFiles = folder.listFiles(new FilenameFilter() {
public boolean accept(File folder, String name) {
return name.toLowerCase().endsWith(".csv");
}
});
listOfCheckBox.clear();
panel.removeAll();
panel.revalidate();
panel.repaint();
for (int i = 0; i < allFiles.length; i++) {
checkBox = new JCheckBox(allFiles[i].getName());
listOfCheckBox.add(checkBox);
panel.add(checkBox);
}
}
}//GEN-LAST:event_jMenuItem1ActionPerformed
private void buttonExecuteActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_buttonExecuteActionPerformed
Items_Application itemsApp;
try {
if (listOfCheckBox.size() > 0) {
itemsApp = new Items_Application(folder.getPath());
for (int i = 0; i < listOfCheckBox.size(); i++) {
if (listOfCheckBox.get(i).isSelected()) {
itemsApp.loadInItem(allFiles[i].getPath());
}
}
itemsApp.buildListOfItemsWithSamePartNb();
itemsApp.buildListOfItemsWithSameThalesNb();
itemsApp.writeOutItems(folder.getPath());
}
} catch (IOException ex) {
ex.printStackTrace();
}
}//GEN-LAST:event_buttonExecuteActionPerformed
private void jMenuItem2ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jMenuItem2ActionPerformed
System.exit(0);
}//GEN-LAST:event_jMenuItem2ActionPerformed
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(Items_IHM.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(Items_IHM.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(Items_IHM.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(Items_IHM.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new Items_IHM().setVisible(true);
}
});
}
