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    copied!<p>I have got it to work. However, there is a problem. The following lines are causing it to make ALL of my popups (i.e. JPopupMenu, JMenu, etc), scrunched so that you can't really read the titles on them.</p> <p>The following lines seem to be the culprit. </p> <pre><code>BasicComboPopup popup = (BasicComboPopup) this.getAccessibleContext().getAccessibleChild(0); Window popupWindow = SwingUtilities.windowForComponent(popup); Window comboWindow = SwingUtilities.windowForComponent(this); if (comboWindow.equals(popupWindow)) { Component c = popup.getParent(); Dimension d = c.getPreferredSize(); c.setPreferredSize(d); } else { popupWindow.pack(); } </code></pre> <p>What is that bit doing? When I take it out, it gets rid of the error.</p> <pre><code>package addressbook.gui; import javax.swing.JFileChooser; import java.io.File; import javax.swing.JButton; import java.awt.event.ActionListener; import java.awt.event.ActionEvent; import javax.swing.JOptionPane; import javax.swing.JComboBox; import javax.swing.event.DocumentListener; import javax.swing.event.DocumentEvent; import java.awt.BorderLayout; import java.awt.Component; import java.awt.Dimension; import java.awt.EventQueue; import java.awt.Window; import java.awt.event.KeyAdapter; import java.awt.event.KeyEvent; import java.util.ArrayList; import java.util.List; import javax.swing.DefaultComboBoxModel; import javax.swing.JButton; import javax.swing.JComboBox; import javax.swing.JFrame; import javax.swing.JList; import javax.swing.JTextField; import javax.swing.MutableComboBoxModel; import javax.swing.SwingUtilities; import javax.swing.plaf.basic.BasicComboBoxEditor; import javax.swing.plaf.basic.BasicComboBoxRenderer; import javax.swing.plaf.basic.BasicComboPopup; import java.beans.PropertyChangeEvent; import java.beans.PropertyChangeListener; import javax.swing.JPanel; import javax.swing.JCheckBox; import javax.swing.BorderFactory; public class FileChooserWithDelete extends JFileChooser { private String textFieldString; private JIntelligentComboBox comboBox; private DefaultComboBoxModel dcm; private JCheckBox read, write, execute; public FileChooserWithDelete() { super("./"); dcm = new DefaultComboBoxModel(); java.io.File f = getCurrentDirectory(); java.io.File[] files = f.listFiles(); for (int i =0; i &lt; files.length; i++) { dcm.addElement(new Object[] {files[i].getName(), "", 0}); } JButton delete = new JButton("Delete"); delete.setToolTipText("Delete file"); comboBox = new JIntelligentComboBox(dcm); addPropertyChangeListener( new PropertyChangeListener() { public void propertyChange(PropertyChangeEvent evt) { if (JFileChooser.DIRECTORY_CHANGED_PROPERTY.equals(evt.getPropertyName())) { JFileChooser chooser = (JFileChooser) evt.getSource(); java.io.File oldDir = (java.io.File) evt.getOldValue(); java.io.File newDir = (java.io.File) evt.getNewValue(); java.io.File curDir = chooser.getCurrentDirectory(); System.out.println(curDir.getName()); /* //dcm.removeAllElements(); comboBox.removeAllItems(); dcm.removeAllElements(); java.io.File[] moreFiles = curDir.listFiles(); System.out.println("Obama is a loser!"); for (int i =0; i &lt; moreFiles.length; i++) { dcm.addElement(new Object[] {moreFiles[i].getName(), "", 0}); //comboBox.insertItemAt(moreFiles[i].getName(), i); } for (int i =0; i &lt; comboBox.getItemCount(); i++) { System.out.println(java.util.Arrays.toString((Object[]) comboBox.getItemAt(i))); } // comboBox.init(); */ comboBox.updateFiles(); } } }); java.awt.Container cont = (java.awt.Container) (getComponents()[3]); java.awt.Container cont2 = (java.awt.Container) (cont.getComponents()[3]); java.awt.Container cont3 = (java.awt.Container) (cont.getComponents()[0]); read = new JCheckBox("Read"); write = new JCheckBox("Write"); execute = new JCheckBox("Execute"); JPanel checkBoxPanel = new JPanel(); checkBoxPanel.setBorder(BorderFactory.createEtchedBorder(javax.swing.border.EtchedBorder.RAISED)); cont3.remove(1); cont3.add(comboBox, 1); checkBoxPanel.setLayout(new java.awt.FlowLayout()); checkBoxPanel.add(read); checkBoxPanel.add(write); checkBoxPanel.add(execute); read.setEnabled(false); write.setEnabled(false); execute.setEnabled(false); addPropertyChangeListener( new PropertyChangeListener() { public void propertyChange(PropertyChangeEvent e2) { if (JFileChooser.SELECTED_FILE_CHANGED_PROPERTY .equals(e2.getPropertyName())) { JFileChooser chooser = (JFileChooser)e2.getSource(); File oldFile = (File)e2.getOldValue(); File newFile = (File)e2.getNewValue(); // The selected file should always be the same as newFile File curFile = chooser.getSelectedFile(); try { if (curFile.canRead()) { read.setSelected(true); } else { read.setSelected(false); } if (curFile.canWrite()) { write.setSelected(true); } else { write.setSelected(false); } if (curFile.canExecute()) { execute.setSelected(true); } else { execute.setSelected(false); } } catch(NullPointerException npe) { return; } } } }); delete.addActionListener( new ActionListener() { public void actionPerformed(ActionEvent e) { File f= getSelectedFile(); java.awt.Container cont = (java.awt.Container) (getComponents()[3]); java.awt.Container cont2 = (java.awt.Container) (cont.getComponents()[3]); java.awt.Container cont3 = (java.awt.Container) (cont.getComponents()[0]); //javax.swing.JTextField jtf = (javax.swing.JTextField) (cont3.getComponents()[1]); String text = (String) comboBox.getItemAt(0); if (f == null) f = new File("./" + text); int option = JOptionPane.showConfirmDialog(null, "Are you sure you wnat to delete?", "Delete file " + f.getName() + "?", JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE); if (option == JOptionPane.YES_OPTION) { if (!f.exists() || text == null) { JOptionPane.showMessageDialog(null, "File doesn't exist.", "Could not find file.", JOptionPane.ERROR_MESSAGE); cancelSelection(); } else { f.delete(); cancelSelection(); } } }}); cont2.setLayout(new java.awt.FlowLayout()); //((java.awt.Container) (getComponents()[3])).add(delete); cont2.add(delete); cont2.add(checkBoxPanel); } protected class JIntelligentComboBox extends JComboBox { private List&lt;Object&gt; itemBackup = new ArrayList&lt;Object&gt;(); public JIntelligentComboBox(MutableComboBoxModel aModel) { super(aModel); init(); } private void init() { this.setRenderer(new searchRenderer()); this.setEditor(new searchComboBoxEditor()); this.setEditable(true); int size = this.getModel().getSize(); Object[] tmp = new Object[this.getModel().getSize()]; for (int i = 0; i &lt; size; i++) { tmp[i] = this.getModel().getElementAt(i); itemBackup.add(tmp[i]); } this.removeAllItems(); this.getModel().addElement(new Object[]{"", "", 0}); for (int i = 0; i &lt; tmp.length; i++) { this.getModel().addElement(tmp[i]); } final JTextField jtf = (JTextField) this.getEditor().getEditorComponent(); jtf.addKeyListener( new KeyAdapter() { @Override public void keyReleased(KeyEvent e) { searchAndListEntries(jtf.getText()); } }); } @Override public MutableComboBoxModel getModel() { return (MutableComboBoxModel) super.getModel(); } private void updateFiles() { itemBackup.clear(); java.io.File f = getCurrentDirectory(); java.io.File[] files = f.listFiles(); for (int i =0; i &lt; files.length; i++) { itemBackup.add(new Object[] {files[i].getName(), "", 0}); } } private void searchAndListEntries(Object searchFor) { List&lt;Object&gt; found = new ArrayList&lt;Object&gt;(); for (int i =0; i &lt; itemBackup.size(); i++) { System.out.println(java.util.Arrays.toString((Object[])itemBackup.get(i))); } for (int i = 0; i &lt; this.itemBackup.size(); i++) { Object tmp = this.itemBackup.get(i); if (tmp == null || searchFor == null) { continue; } Object[] o = (Object[]) tmp; String s = (String) o[0]; /* if (s.matches("(?i).*" + searchFor + ".*")) { found.add(new Object[]{ ((Object[]) tmp)[0], searchFor, ((Object[]) tmp)[2] }); } } */ if (s.startsWith((String) searchFor)) found.add(new Object[] {((Object[]) tmp) [0], searchFor, ((Object[]) tmp) [2]});} this.removeAllItems(); this.getModel().addElement(new Object[]{searchFor, searchFor, 0}); for (int i = 0; i &lt; found.size(); i++) { this.getModel().addElement(found.get(i)); } this.setPopupVisible(true); // http://stackoverflow.com/questions/7605995\ /* BasicComboPopup popup = (BasicComboPopup) this.getAccessibleContext().getAccessibleChild(0); Window popupWindow = SwingUtilities.windowForComponent(popup); Window comboWindow = SwingUtilities.windowForComponent(this); if (comboWindow.equals(popupWindow)) { Component c = popup.getParent(); Dimension d = c.getPreferredSize(); c.setPreferredSize(d); } else { popupWindow.pack(); } */ System.out.println("break"); for (int i =0; i &lt; found.size(); i++) { System.out.println(java.util.Arrays.toString((Object[]) found.get(i))); } } class searchRenderer extends BasicComboBoxRenderer { @Override public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) { if (index == 0) { setText(""); return this; } Object[] v = (Object[]) value; String s = (String) v[0]; String lowerS = s.toLowerCase(); String sf = (String) v[1]; String lowerSf = sf.toLowerCase(); List&lt;String&gt; notMatching = new ArrayList&lt;String&gt;(); if (!sf.equals("")) { int fs = -1; int lastFs = 0; while ((fs = lowerS.indexOf(lowerSf, (lastFs == 0) ? -1 : lastFs)) &gt; -1) { notMatching.add(s.substring(lastFs, fs)); lastFs = fs + sf.length(); } notMatching.add(s.substring(lastFs)); } String html = ""; if (notMatching.size() &gt; 1) { html = notMatching.get(0); int start = html.length(); int sfl = sf.length(); for (int i = 1; i &lt; notMatching.size(); i++) { String t = notMatching.get(i); html += "&lt;b style=\"color: black;\"&gt;" + s.substring(start, start + sfl) + "&lt;/b&gt;" + t; start += sfl + t.length(); } } this.setText("&lt;html&gt;&lt;head&gt;&lt;/head&gt;&lt;body style=\"color: gray;\"&gt;" + html + "&lt;/body&gt;&lt;/head&gt;"); return this; } } class searchComboBoxEditor extends BasicComboBoxEditor { public searchComboBoxEditor() { super(); } @Override public void setItem(Object anObject) { if (anObject == null) { super.setItem(anObject); } else { Object[] o = (Object[]) anObject; super.setItem(o[0]); } } @Override public Object getItem() { return new Object[]{super.getItem(), super.getItem(), 0}; } } } public JTextField getComboBoxTextField() { final JTextField jtf = (JTextField) comboBox.getEditor().getEditorComponent(); return jtf; } } </code></pre>
 

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