Bonjour,

J'essaie de faire une interface graphique en Java avec Netbeans 8.2. J'utilise une JFrame Form. Dans cette JFrame, j'ai placé un JScrollPane qui contient lui même un JPanel.

Dans mon application, lorsque j'ouvre un dossier contenant tous les fichiers avec l'extensions ".csv", le nom de chaque fichier accompagné de son checkBox, vient se placé dans ce JPanel.
Cependant voilà mon petit problème : quand mon dossier comprend un seul fichier, celui-ci (son nom + checkBox) vient se placer au centre de mon JPanel. Et quand j'ouvre peu de fichiers, un espace trop important sépare mes fichiers. Ci-dessous le code source de mon application, ainsi que deux images qui montrent mon problème...

Code : Sélectionner tout - Visualiser dans une fenêtre à part
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public class Items_IHM extends javax.swing.JFrame {
 
    List<JCheckBox> listOfCheckBox = new ArrayList<>();
    List<JCheckBox> listOfCheckBoxChecked = new ArrayList<>();
    File[] allFiles;
    File folder;
    String folderPathSave;
    File absolutePath;
 
    /**
     * Creates new form Items_IHM
     */
    public Items_IHM() {
        initComponents();
        panel.setLayout(new GridLayout(0, 1, 0, 0));
        this.setLocationRelativeTo(null);
    }
 
    /**
     * 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.
     */
    @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();
        textFieldSave = new javax.swing.JTextField();
        jButton1 = new javax.swing.JButton();
        jMenuBar1 = new javax.swing.JMenuBar();
        jMenu1 = new javax.swing.JMenu();
        jMenuItem1 = new javax.swing.JMenuItem();
        jMenuItem2 = new javax.swing.JMenuItem();
 
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setResizable(false);
 
        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, 436, 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);
            }
        });
 
        textFieldSave.setEditable(false);
        textFieldSave.setText("Enregistrer-sous");
 
        jButton1.setIcon(new javax.swing.ImageIcon(getClass().getResource("/items_application/iconSave.png"))); // NOI18N
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(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);
 
        setJMenuBar(jMenuBar1);
 
        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(srollPane, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                        .addComponent(textFieldSave)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 29, javax.swing.GroupLayout.PREFERRED_SIZE)))
                .addContainerGap())
            .addGroup(layout.createSequentialGroup()
                .addGap(187, 187, 187)
                .addComponent(buttonExecute, javax.swing.GroupLayout.PREFERRED_SIZE, 101, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(44, 187, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(srollPane, javax.swing.GroupLayout.PREFERRED_SIZE, 176, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(29, 29, 29)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 30, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(textFieldSave, javax.swing.GroupLayout.PREFERRED_SIZE, 30, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(33, 33, 33)
                .addComponent(buttonExecute, javax.swing.GroupLayout.DEFAULT_SIZE, 37, 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_PATH1", "");
        JFileChooser fileChooser = new JFileChooser();
        fileChooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
        fileChooser.setDialogTitle("Ouvrir un répertoire");
        fileChooser.setCurrentDirectory(new File(path));
        int returnVal = fileChooser.showOpenDialog(null);
 
        if (returnVal == JFileChooser.APPROVE_OPTION) {
            folder = fileChooser.getSelectedFile();
            fileChooser.setCurrentDirectory(folder);
            preferences.put("DEFAULT_PATH1", 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++) {
                JCheckBox checkBox = new JCheckBox(allFiles[i].getName());
                listOfCheckBox.add(checkBox);
                panel.add(checkBox);
            }
        }
    }
Nom : IHM_Problem1.JPG
Affichages : 337
Taille : 17,4 Ko
Nom : IHM_Problem2.JPG
Affichages : 297
Taille : 16,9 Ko