adjustPopupWidth will not correctly work if there is a vertical scroll bar

Previously, I use "adjustPopupWidth", so that my JComboBox will enough width to display all items in the drop-down list.

However, I realize when he is present of the vertical scroll bar, 'adjustPopupWidth' will not produce a good width to display all the items in the drop-down list. This causes a horizontal scrollbar to appear as well (which is not what I want)

A code example is as follows:
/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

/*
 * NewJFrame.java
 *
 * Created on Dec 30, 2010, 12:35:42 AM
 */

package javaapplication24;

import java.awt.Component;
import java.awt.Dimension;
import javax.swing.JPopupMenu;
import javax.swing.JScrollBar;
import javax.swing.JScrollPane;
import javax.swing.event.PopupMenuEvent;
import javax.swing.event.PopupMenuListener;
import javax.swing.plaf.basic.BasicComboPopup;

/**
 *
 * @author yccheok
 */
public class NewJFrame extends javax.swing.JFrame {

    // Resize JComboBox dropdown doesn't work without customized ListCellRenderer
    private void adjustPopupWidth() {
        if (jComboBox1.getItemCount() == 0) return;
        Object comp = jComboBox1.getUI().getAccessibleChild(jComboBox1, 0);
        if (!(comp instanceof JPopupMenu)) {
            return;
        }
        JPopupMenu popup = (JPopupMenu) comp;
        JScrollPane scrollPane = (JScrollPane) popup.getComponent(0);

        //Object value = this.getItemAt(0);
        //Component rendererComp = this.getRenderer().getListCellRendererComponent(null, value, 0, false, false);
        //if (rendererComp instanceof JXTable) {
        //    scrollPane.setColumnHeaderView(((JTable) rendererComp).getTableHeader());
        //}
        BasicComboPopup basic = (BasicComboPopup)comp;
        Dimension prefSize = basic.getList().getPreferredSize();
        Dimension size = scrollPane.getPreferredSize();

        size.width = Math.max(size.width, prefSize.width);
        scrollPane.setPreferredSize(size);
        scrollPane.setMaximumSize(size);
        // Do we need to call revalidate?
        //scrollPane.revalidate();
    }

    private void adjustScrollBar() {
        final int max_search = 8;
        // i < max_search is just a safe guard when getAccessibleChildrenCount
        // returns an arbitary large number. 8 is magic number
        JPopupMenu popup = null;
        for (int i = 0, count = jComboBox1.getUI().getAccessibleChildrenCount(jComboBox1); i < count && i < max_search; i++) {
            Object o = jComboBox1.getUI().getAccessibleChild(jComboBox1, i);
            if (o instanceof JPopupMenu) {
                popup = (JPopupMenu)o;
                break;
            }
        }
        if (popup == null) {
            return;
        }
        JScrollPane scrollPane = null;
        for (int i = 0, count = popup.getComponentCount(); i < count && i < max_search; i++) {
            Component c = popup.getComponent(i);
            if (c instanceof JScrollPane) {
                scrollPane = (JScrollPane)c;
                break;
            }
        }
        if (scrollPane == null) {
            return;
        }
        scrollPane.setHorizontalScrollBar(new JScrollBar(JScrollBar.HORIZONTAL));
        scrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
    }

    private PopupMenuListener getPopupMenuListener() {
        return new PopupMenuListener() {
            @Override
            public void popupMenuWillBecomeVisible(PopupMenuEvent e) {
                // We will have a much wider drop down list.
                adjustPopupWidth();
            }

            @Override
            public void popupMenuWillBecomeInvisible(PopupMenuEvent e) {
            }

            @Override
            public void popupMenuCanceled(PopupMenuEvent e) {
            }
        };
    }

    /** Creates new form NewJFrame */
    public NewJFrame() {
        initComponents();
        // Have a wide enough drop down list.
        jComboBox1.addPopupMenuListener(this.getPopupMenuListener());
        adjustScrollBar();
    }

    /** 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">
    private void initComponents() {

        jComboBox1 = new javax.swing.JComboBox();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jComboBox1.setModel(new javax.swing.DefaultComboBoxModel(new String[] { "Item 1", "Item 2", "Item 3", "Item 4", "Item 5", "Item 6", "Item 7", "long long long long long string", "Item 8", " " }));

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(140, 140, 140)
                .addComponent(jComboBox1, javax.swing.GroupLayout.PREFERRED_SIZE, 108, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(152, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jComboBox1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(269, 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 NewJFrame().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify
    private javax.swing.JComboBox jComboBox1;
    // End of variables declaration

}
Remove 'Item 1' up to 'Article 7', results in a vertical scroll bar is not displayed. Therefore, "adjustPopupWidth" will work correctly.

It seems that the calculation within the "adjustPopupWidth", should take into account in the bar vertical scrolling. But how?

Thank you.

[url http://www.camick.com/java/blog.html?name=combo-box-popup] Combo Box Popup handles this.

Tags: Java

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