Java Glossary : JScrollPane

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JScrollPane

Allows you to display part of a large JPanel and let the user scroll to see all over it. In AWT, you use ScrollPane, and in Swing JScrollPane. Here is how you use it:

import javax.swing.JScrollPane;
...
// add what you want to scroll, e.g. a TextArea or JPanel
// other option is VERTICAL_SCROLLBAR_NEVER to turn off bar.
JScrollPane scroller = new JScrollPane( textArea,
                                        JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
                                        JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS );

// control the speed effect of the wheelmouse
scroller.getVerticalScrollBar().setUnitIncrement( 16 );

// Using the default VERTICAL_SCROLLBAR_AS_NEEDED will use scrollbars even when
// not strictly needed.  If you want precise control you must decide for yourself
// dynamically.
scroller.setVerticalScrollBarPolicy( JScrollPane.HORIZONTAL_SCROLLBAR_NEVER );

documentation on jScrollPane : available:

on the web at java.Sun.com
on J: in the JDK 1.4.2_04: J:\j2sdk1.4.2_04\docs\api\javax\swing\JScrollPane.html
on J: in the JDK 1.5 beta: J:\Program Files\Java\j2sdk1.5.0\docs\api\javax\swing\JScrollPane.html

AWT ¤ JPanel ¤ scrollbar ¤ ScrollPane ¤ Swing ¤ window differences

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