Databases
StackOverflow2013
Postsdbo
POJava / Swing : JTextArea in a JScrollPane, how to prevent auto-scroll?
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POJava / Swing : JTextArea in a JScrollPane, how to prevent auto-scroll?
    primarykey
    data
    text
    <p>here's a runnable piece of code that shows what my "problem" is.</p> <p>I've got a <code>JTextArea</code> wrapped in a <code>JScrollPane</code>. When I change the text of the <code>JTextArea</code>, the <code>JScrollPane</code> scrolls automatically to the end of the text and I don't want that.</p> <p>Here are my requirements:</p> <ul> <li>the application <em>should not</em> scroll vertically automatically but...</li> <li>the user <em>should</em> be able to scroll vertically</li> <li>the user <em>should not</em> be able to scroll horizontally</li> <li>the application <em>should never</em> scroll horizontally</li> <li>the JTextArea must not be editable</li> </ul> <p>(so even if there's more text than what can fit horizontally, neither the application nor the user should be able to scroll horizontally. While vertically, only the user should be able to scroll.)</p> <p>I don't know how to "fix" this: should this be fixed using <code>JTextArea</code> or <code>JScrollPane</code> methods? </p> <p>Note that AFAICT this is <em>not</em> a duplicate at all of: <a href="https://stackoverflow.com/questions/1377887">JTextPane prevents scrolling in the parent JScrollPane</a></p> <p>Here's the kinda funny example, every 200 ms it puts new text in the <code>JTextArea</code> and you can see the <code>JScrollPane</code> always scrolling automatically to the end of the text.</p> <pre><code>import javax.swing.*; import java.awt.*; import java.util.Random; public final class TextInScrollPane extends JFrame { private static final Random r = new Random( 42 ); public static void main( final String[] args ) { final JFrame f = new JFrame(); f.setDefaultCloseOperation( EXIT_ON_CLOSE ); f.setLayout(new BorderLayout()); final JTextArea jta = new JTextArea( "Some text", 30, 30 ); jta.setEditable( false ); // This must not be editable final JScrollPane jsp = new JScrollPane( jta ); jsp.setHorizontalScrollBarPolicy( JScrollPane.HORIZONTAL_SCROLLBAR_NEVER ); jsp.setVerticalScrollBarPolicy( JScrollPane.VERTICAL_SCROLLBAR_ALWAYS ); f.add( jsp, BorderLayout.CENTER ); f.pack(); f.setLocationRelativeTo( null ); f.setVisible(true); final Thread t = new Thread( new Runnable() { public void run() { while ( true ) { try {Thread.sleep( 200 );} catch ( InterruptedException e ) {} final StringBuilder sb = new StringBuilder(); for (int i = 0; i &lt; 50 + r.nextInt( 75 ); i++) { for (int j = 0; j &lt; r.nextInt(120); j++) { sb.append( (char) 'a' + r.nextInt(26) ); } sb.append( '\n' ); } SwingUtilities.invokeLater( new Runnable() { public void run() { jta.setText( sb.toString() ); } } ); } } }); t.start(); } } </code></pre>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USCommunity
    1. USSyntaxT3rr0r
    plurals
    1. PL
      singulars
      1. LTLinked
    2. PL
      singulars
      1. LTLinked
    1. PL
      singulars
      1. LTLinked
    2. PL
      singulars
      1. LTDuplicate
    3. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POJava / Swing : JTextArea in a JScrollPane, how to prevent auto-scroll?
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POJava / Swing : JTextArea in a JScrollPane, how to prevent auto-scroll?
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. POJava / Swing : JTextArea in a JScrollPane, how to prevent auto-scroll?
      1. This table or related slice is empty.
      1. VTUpMod
    1. COnote to all: comments about the empty *catch* block and the usage of *final* can be sent to */dev/null*, this is really not what this question is about ;)
      singulars
      1. POJava / Swing : JTextArea in a JScrollPane, how to prevent auto-scroll?
      1. USSyntaxT3rr0r
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload