How to display a temporary baloon tooltip during input validation?

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感动是毒
感动是毒 2021-02-08 01:58

I\'m somewhat used to the GUI idiom where when I type something wrong in a text input field a balloon pops up from the field with info about what I got wrong / expected input. I

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  • 2021-02-08 02:21

    Balloon Tip is a library that does that:

    balloonTip = new BalloonTip(f, "Tooltip msg");
    

    That was all needed! If you insist on a having it be a tooltip too:

    tooltipBalloon = new BalloonTip(someComponent, "I'm a balloon tooltip!");
    // Now convert this balloon tip to a tooltip, such that the tooltip shows up after 500 milliseconds and stays visible for 3000 milliseconds
    ToolTipUtils.balloonToToolTip(tooltipBalloon, 500, 3000);
    
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  • 2021-02-08 02:23

    The link given by James Poulson probably provides a better solution, but I had to see if this were possible with some simple Java code using a DocumentFilter and a JWindow. Here's one possible way to do this:

    import java.awt.Color;
    import java.awt.Dimension;
    import java.awt.Point;
    import java.awt.Window;
    import javax.swing.*;
    import javax.swing.text.AttributeSet;
    import javax.swing.text.BadLocationException;
    import javax.swing.text.DocumentFilter;
    import javax.swing.text.PlainDocument;
    
    public class InfoBalloon extends JPanel {
       private static final int PREF_WIDTH = 400;
       private static final int PREF_HEIGHT = 300;
       private static final String REGEX_TEST = "\\d*";
       private static final String ERROR_TEXT = "Please only add numbers to the text field";
       private JTextField textField = new JTextField(10);
       private JWindow errorWindow;
    
    
       public InfoBalloon() {
          add(new JLabel("Please Enter Number"));
          add(textField);
    
          ((PlainDocument)textField.getDocument()).setDocumentFilter(new MyNumberDocFilter());
       }
    
       @Override
       public Dimension getPreferredSize() {
          return new Dimension(PREF_WIDTH, PREF_HEIGHT);
       }
    
       private void showErrorWin() {     
          if (errorWindow == null) {
             JLabel errorLabel = new JLabel(ERROR_TEXT);
             Window topLevelWin = SwingUtilities.getWindowAncestor(this);
             errorWindow = new JWindow(topLevelWin);
             JPanel contentPane = (JPanel) errorWindow.getContentPane();
             contentPane.add(errorLabel);
             contentPane.setBackground(Color.white);
             contentPane.setBorder(BorderFactory.createLineBorder(Color.LIGHT_GRAY));
             errorWindow.pack();
          }
    
          Point loc = textField.getLocationOnScreen();
          errorWindow.setLocation(loc.x + 20, loc.y + 30);
          errorWindow.setVisible(true);
       }
    
       private boolean textOK(String text) {
          if (text.matches(REGEX_TEST)) {
             return true;
          }
          return false;
       }
    
       private class MyNumberDocFilter extends DocumentFilter {
          @Override
          public void insertString(FilterBypass fb, int offset, String string,
                   AttributeSet attr) throws BadLocationException {
             if (textOK(string)) {
                super.insertString(fb, offset, string, attr);
                if (errorWindow != null && errorWindow.isVisible()) {
                   errorWindow.setVisible(false);
                }
             } else {
                showErrorWin();
             }
          }
    
          @Override
          public void replace(FilterBypass fb, int offset, int length, String text,
                   AttributeSet attrs) throws BadLocationException {
             if (textOK(text)) {
                super.replace(fb, offset, length, text, attrs);
                if (errorWindow != null && errorWindow.isVisible()) {
                   errorWindow.setVisible(false);
                }
             } else {
                showErrorWin();
             }
          }
    
          @Override
          public void remove(FilterBypass fb, int offset, int length)
                   throws BadLocationException {
             super.remove(fb, offset, length);
             if (errorWindow != null && errorWindow.isVisible()) {
                errorWindow.setVisible(false);
             }
          }
       }
    
       private static void createAndShowUI() {
          JFrame frame = new JFrame("Info Balloon");
          frame.getContentPane().add(new InfoBalloon());
          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          frame.pack();
          frame.setLocationRelativeTo(null);
          frame.setVisible(true);
       }
    
       public static void main(String[] args) {
          java.awt.EventQueue.invokeLater(new Runnable() {
             public void run() {
                createAndShowUI();
             }
          });
       }
    }
    

    Constructive or destructive criticism is most welcome!

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