Horizontal scroll bar for JComboBox through multiple aspect

From [http://www.coderanch.com/t/432788/GUI/java/JComboBox-horizontall-scroll-bar] and [http://forums.sun.com/thread.jspa?threadID=5369365], I know that the technique to have a horizontal scroll bar for JComboBox.

However, their proposed solution are limited to the Look n Feel specific.

As you can see, the below excerpt key code is malfunctioning, if users are Linux machine with GTK + look n feel, or machine Windows with Nimbus look n feel.

How can I have a portable way to JComboBox able to have a horizontal scroll bar?

The complete source code is [http://jstock.cvs.sourceforge.net/viewvc/jstock/jstock/src/org/yccheok/jstock/gui/AutoCompleteJComboBox.java?revision=1.16 & view = markup]

The key code snippet are as follows:

package org.yccheok.jstock.gui;

public class AutoCompleteJComboBox extends JComboBox {

   @Override
    public void setUI(ComboBoxUI ui)
    {
        if (ui != null)
        {
            // Let's try our own customized UI.
            Class c = ui.getClass();
            final String myClass = "org.yccheok.jstock.gui.AutoCompleteJComboBox$My" + c.getSimpleName();

            try {
                ComboBoxUI myUI = (ComboBoxUI) Class.forName(myClass).newInstance();
                super.setUI(myUI);
                return;
            } catch (ClassNotFoundException ex) {
                log.error(null, ex);
            } catch (InstantiationException ex) {
                log.error(null, ex);
            } catch (IllegalAccessException ex) {
                log.error(null, ex);
            }
        }

        // Either null, or we fail to use our own customized UI.
        // Fall back to default.
        super.setUI(ui);
    }

    // This is a non-portable method to make combo box horizontal scroll bar.
    // Whenever there is a new look-n-feel, we need to manually provide the ComboBoxUI.
    // Any idea on how to make this portable?
    //
    protected static class MyWindowsComboBoxUI extends com.sun.java.swing.plaf.windows.WindowsComboBoxUI
    {
        @Override
        protected ComboPopup createPopup()
        {
            return new MyComboPopup(comboBox);
        }
    }

    protected static class MyMotifComboBoxUI extends com.sun.java.swing.plaf.motif.MotifComboBoxUI
    {
        @Override
        protected ComboPopup createPopup()
        {
            return new MyComboPopup(comboBox);
        }
    }

    protected static class MyMetalComboBoxUI extends javax.swing.plaf.metal.MetalComboBoxUI
    {
        @Override
        protected ComboPopup createPopup()
        {
            return new MyComboPopup(comboBox);
        }
    }

    private static class MyComboPopup extends BasicComboPopup
    {
        public MyComboPopup(JComboBox combo)
        {
            super(combo);
        }

        @Override
        public JScrollPane createScroller()
        {
            return new JScrollPane(list,JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
                    JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
        }
    }
}

Published by: 803903 on October 20, 2010 18:03

Darryl Burke wrote:
Purists will tell you that such things should not be done in a renderer

not too purist - but there are thingies you MUST NOT spread like that pollutes community knowledge ;-)

There is an official way (read: code of the heart itself does swing combo) to access the pop-up window and then do what you must

    private void adjustScrollBar(JComboBox box) {
        if (box.getItemCount() == 0) return;
        Object comp = box.getUI().getAccessibleChild(box, 0);
        if (!(comp instanceof JPopupMenu)) {
            return;
        }
        JPopupMenu popup = (JPopupMenu) comp;
        JScrollPane scrollPane = (JScrollPane) popup.getComponent(0);
        scrollPane.setHorizontalScrollBar(new JScrollBar(JScrollBar.HORIZONTAL));
        scrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
    }

Simply assign the scroll bar will work at any time after the creation of the drop-down list (BTW: assigning the horizontalScrollBar null got really... didn't even know it is valid). If you want to resize the drop-down list, you will need to do it in a popupMenuListener willBecomeVisible: at this time, all internal components are ready for touch-ups. Just for fun, set up the drop-down list to adapt to the requirements of the size of a JXTable used as a rendering component:

    private void adjustPopupWidth(JComboBox box) {
        if (box.getItemCount() == 0) return;
        Object comp = box.getUI().getAccessibleChild(box, 0);
        if (!(comp instanceof JPopupMenu)) {
            return;
        }
        JPopupMenu popup = (JPopupMenu) comp;
        JScrollPane scrollPane = (JScrollPane) popup.getComponent(0);
        Object value = box.getItemAt(0);
        Component rendererComp = box.getRenderer().getListCellRendererComponent(null, value, 0, false, false);
        if (rendererComp instanceof JXTable) {
            scrollPane.setColumnHeaderView(((JTable) rendererComp).getTableHeader());
        }
        Dimension prefSize = rendererComp.getPreferredSize();
        Dimension size = scrollPane.getPreferredSize();
        size.width = Math.max(size.width, prefSize.width);
        scrollPane.setPreferredSize(size);
        scrollPane.setMaximumSize(size);
        scrollPane.revalidate();
    }

and Yes, this is the example for setXXSize. But then, it isn't but application code a code 'in-house framework.

See you soon... and the real work
Jeanette

Tags: Java

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