Disable the scroll bar when the content is less than the viewport?

Hello

I have a vertical scroll bar has always shown (JScrollPane.VERTICAL_SCROLLBAR_ALWAYS).
but I want that it should be disabled when the content in the display is lower at the height of the viewport.

For example, browser Chrome in Windows: when you open Google, the content of the page is fairly low in height and scrolling in Chrome bar will be disabled. As soon as you have enough content on the page of the scrollbar will be active.

How can I achieve this?
Thank you

Hello

It isn't really a problem, I just know that it is a limitation of the SWING, (...)
Almost all app have this behavior; It is not very nice visually.

I don't have Chrome and haven't seen this problem until now, anywhere (but it is true, I'm way behind in terms of GUI mode).
The behavior that I'm used to (and which Swing designers apparently supposed to be standard too), which is a scroll bar disappears when the width of the view does not justify it ( SCROLLBAR_AS_NEEDED ). Using SCROLLBAR_ALWAYS implies that you want to the scroll bar, no matter if the width of the merit. How the scroll bar looks like in this case sounds like a look and feel selection instead (I don't have older OSs, but maybe you know an operating system where this behavior is the norm? In this case, Yes, this is a limitation of the corresponding Swing L & F).

Maybe there is a work around.

Because this isn't the OS Lebanese armed forces, which can be "manually coded", by listeneing to resize events and thus change the appearance of the ScrollBar.
Assuming that the "disabled" appearance scroll bar is what you are looking for (no idea, it's just an example, if that do not meet your needs, you can do something else in the placeholder code), here is one, certainly dense enough, workaround.
Notice how the vertical and horizontal scroll bar is different (I applied workaround only to the latter).

import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

public class TestDisableScrollBar extends JPanel
{
    private static final String SHORT_TEXT = "text";
    private static final String LONG_TEXT = "texttexttexttexttexttexttexttexttexttexttextte";

    private static void createAndShowGUI()
  {
        JFrame frame = new JFrame("Demo");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JTextArea textarea = new JTextArea(5, 5); // just to take up some space.
        final JLabel label = new JLabel(SHORT_TEXT);
        JPanel view = new JPanel();
        view.setLayout(new GridLayout(2, 1));
        view.add(label);
        view.add(textarea);
        final JScrollPane widget = new JScrollPane(view, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
        widget.getHorizontalScrollBar().setEnabled(false);
        widget.getViewport().addChangeListener(new ChangeListener() {
            public void stateChanged(ChangeEvent e) {
                widget.getHorizontalScrollBar().setEnabled(
                        widget.getViewport().getWidth()<
                        widget.getViewport().getView().getWidth());
            }
        });
        frame.getContentPane().add(widget, BorderLayout.CENTER);
        JButton alternateText = new JButton("Switch width");
        alternateText.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                label.setText(label.getText().equals(SHORT_TEXT)?
                    LONG_TEXT : SHORT_TEXT);
            }
        });
        frame.getContentPane().add(alternateText, BorderLayout.SOUTH);
        frame.pack();
        frame.setVisible(true);
      }

    public static void main(String[] args) {
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
              }
          });
    }

  }

Tags: Java

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