Notes - Java Swing

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JAVA Swing GUI tips and howtos.

Contents:


Opening and saving files using a JFileChooser

This example shows how to use a single filechooser to open and save. The filechooser will remember the directory it entered last which makes it a lot easier for the user. openFile and saveFile can be buttons or menu items with an ActionListener.


   public void actionPerformed(ActionEvent event)
   {
      Object source = event.getSource();

      if (source == openFile)
      {
         if (fileChooser.showOpenDialog(this) == JFileChooser.APPROVE_OPTION)
         {
            try
            {
               File file = fileChooser.getSelectedFile(); //get file(path+name)
               BufferedReader in = new BufferedReader (new FileReader(file));
               //in.readLine() etc
            }
            catch (Exception e) { //ignore...
            }
         }
         else { //user cancelled...
         }
      }
      else if (source == saveFile)
      {
         if (fileChooser.showSaveDialog(this) == JFileChooser.APPROVE_OPTION)
         {
            try
            {
               File file = fileChooser.getSelectedFile();
               PrintWriter out = new PrintWriter(file);
               //out.print() etc
               out.close();
            }
            catch (Exception e) { //ignore...
            }
         }
         else { //user cancelled...
         }
      }

Making JPopupMenu pop up

Create the JPopupMenu and add JMenuItems to it (and ActionListeners to the items) like a normal JMenu. But instead of adding it to a menubar, wrap it in a class that implements MouseAdapter, and use addMouseListener() to add the listener to the item to popup over:

rightClickMeComponent.addMouseListener(new PopupListener(popupMenu))

You create the PopupListener class - it needs to call popupMenu.show() to show the popup when the events are right. This sample PopupListener is a slightly modified version of the one from The Java Tutorial:


public class PopupListener extends MouseAdapter
{
   JPopupMenu popup;

   PopupListener(JPopupMenu popupMenu)
   {
         popup = popupMenu;
   }

   public void mousePressed(MouseEvent e)
   {
         if (e.isPopupTrigger())
             popup.show(e.getComponent(), e.getX(), e.getY());
   }

   public void mouseReleased(MouseEvent e)
   {
         if (e.isPopupTrigger())
             popup.show(e.getComponent(), e.getX(), e.getY());
   }
}

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