Google Tag Manager

2015/04/28

aterai

ScrollBar for JTextField

Code

scroller.setModel(textField.getHorizontalVisibility());
//...
class EmptyThumbHandler extends ComponentAdapter implements DocumentListener {
  private final BoundedRangeModel emptyThumbModel
    = new DefaultBoundedRangeModel(0, 1, 0, 1);
  private final JTextField textField;
  private final JScrollBar scroller;
  public EmptyThumbHandler(JTextField textField, JScrollBar scroller) {
    super();
    this.textField = textField;
    this.scroller = scroller;
  }
  private void changeThumbModel() {
    EventQueue.invokeLater(new Runnable() {
      @Override public void run() {
        BoundedRangeModel m = textField.getHorizontalVisibility();
        int iv = m.getMaximum() - m.getMinimum() - m.getExtent() - 1; //-1:bug?
        if (iv <= 0) {
          scroller.setModel(emptyThumbModel);
        } else {
          scroller.setModel(textField.getHorizontalVisibility());
        }
      }
    });
  }
  @Override public void componentResized(ComponentEvent e) {
    changeThumbModel();
  }
  @Override public void insertUpdate(DocumentEvent e) {
    changeThumbModel();
  }
  @Override public void removeUpdate(DocumentEvent e) {
    changeThumbModel();
  }
  @Override public void changedUpdate(DocumentEvent e) {
    changeThumbModel();
  }
}

References