CODEWITHSUNDEEP
javaswingjscrollpane
sproketboy
sproketboy

Reputation: 9468

JScrollPane for a panel containing a set of labels with BoxLayout

I'd like to use a JScrollPane for a panel which has an arbitrary list of labels in it using box layout. I'm trying to get it so that the scrollbar would appear if there were too many items (labels) to display.

I tried adding a JScrollPane to the panel and then add the labels but then I don't see any scroll bar.

Any ideas?

TIA

Upvotes: 2

Views: 5692

Answers (4)

Erel Segal-Halevi
Erel Segal-Halevi

Reputation: 36843

Did you remember to set the preferred size of the content panel?

    final JFrame frame = new JFrame("Scroll Demo");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setLayout(new BorderLayout());

    final Box textArea = Box.createVerticalBox();
    final JScrollPane textAreaScroll = new JScrollPane(textArea);
    textAreaScroll.setPreferredSize(new Dimension(80,150)); /* essential! */
    JButton addButton = new JButton("ADD");
    addButton.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent arg0) {
            textArea.add(new JLabel("abc"));
            textArea.revalidate();
        }
    });

    frame.getContentPane().add(textAreaScroll, BorderLayout.SOUTH);
    frame.getContentPane().add(Box.createRigidArea(new Dimension(10,10)), BorderLayout.CENTER);
    frame.getContentPane().add(addButton, BorderLayout.NORTH);

    frame.pack();
    frame.setVisible(true);

In this example, the scroll bar works correctly, but if you remove the line marked as "essential", it will not work anymore.

Upvotes: 0

sproketboy
sproketboy

Reputation: 9468

Here's how I did it.

JPanel midPanel = new JPanel();
midPanel.setLayout(new BoxLayout(midPanel, BoxLayout.Y_AXIS));
midPanel.add(new JLabel("<html><u>Label</u>"));
Box box = Box.createVerticalBox();
for (Item item : data.getInventory()) {
    inventory.add(box.add(new JLabel(item.getName())));
}

JScrollPane jscrlpBox = new JScrollPane(box);
midPanel.add(jscrlpBox);
add(midPanel, BorderLayout.CENTER);

From:

http://www.java2s.com/Code/Java/Swing-JFC/JScrollPanetoholdscrollablecomponent.htm

Upvotes: 0

finnw
finnw

Reputation: 48659

Make sure that you call validate() or revalidate() on the JScrollPane after adding an item, to force the preferred size of the panel to be recalculated.

Upvotes: 1

Michael Borgwardt
Michael Borgwardt

Reputation: 346516

For this kind of thing, you'd normally use a JList or JTable (if you need custom rendering).

Upvotes: 1

Related Questions