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Info Assist Example

/* Code revised from Desktop Java Live: http://www.sourcebeat.com/downloads/ */ import java.awt.Component; import java.awt.KeyboardFocusManager; import java.beans.PropertyChangeEvent; import java.beans.PropertyChangeListener; import javax.swing.JComponent; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JTextField; import com.jgoodies.forms.builder.DefaultFormBuilder; import com.jgoodies.forms.layout.FormLayout; import com.jgoodies.validation.view.ValidationComponentUtils; import com.jgoodies.validation.view.ValidationResultViewFactory; public class InfoAssistExample extends JPanel {     private JLabel infoLabel;     public InfoAssistExample() {         DefaultFormBuilder formBuilder = new DefaultFormBuilder(new FormLayout("right:pref, 3dlu, p:g"));         formBuilder.setDefaultDialogBorder();         JTextField nameField = new JTextField();         JTextField feedField = new JTextField();         JTextField siteField = new JTextField();         ValidationComponentUtils.setInputHint(nameField, "Enter a name.");         ValidationComponentUtils.setInputHint(feedField, "Enter a valid rss feed url.");         ValidationComponentUtils.setInputHint(siteField, "Enter a site url.");         this.infoLabel = new JLabel();         this.infoLabel.setIcon(ValidationResultViewFactory.getInfoIcon());         this.infoLabel.setVisible(false);         KeyboardFocusManager.getCurrentKeyboardFocusManager().addPropertyChangeListener(new FocusChangeHandler());         formBuilder.append(this.infoLabel, 3);         formBuilder.append("Name:", nameField);         formBuilder.append("Site Url:", siteField);         formBuilder.append("Feed Url:", feedField);         add(formBuilder.getPanel());     }     private class FocusChangeHandler implements PropertyChangeListener {         public void propertyChange(PropertyChangeEvent evt) {             String propertyName = evt.getPropertyName();             if (!"permanentFocusOwner".equals(propertyName))                 return;             Component focusOwner = KeyboardFocusManager                     .getCurrentKeyboardFocusManager().getFocusOwner();             String focusHint = (focusOwner instanceof JComponent)                     ? (String) ValidationComponentUtils                     .getInputHint((JComponent) focusOwner)                     : null;             infoLabel.setText(focusHint);             infoLabel.setVisible(focusHint != null);         }     }     public static void main(String[] a){       JFrame f = new JFrame("Info Assist Example");       f.setDefaultCloseOperation(2);       f.add(new InfoAssistExample());       f.pack();       f.setVisible(true);     } }                     jgoodiesValidation.zip( 277 k)