🚀 go-pugleaf

I'm having the reverse problem with jdbNavComboBox.  I can't get
ItemStateChanged or ActionEvent to fire at run time, despite my clicking
and selecting away on the ComboBox.  Any thoughts?

Bill

Richard Wilkman wrote:

> Michael:
>
> ItemStateChanged is fired twice because state changes twice.
>
> Base.  You have a Combobox (or any other list type item) which by
> default has some item selected.
>
> Action.  You select some other item.
>
> Result.  The item that was selected says "hey!  my state changed".
> The item that just got selected says "hey!  me to".
>
> So, inside your event that handles state change check if it's a
> selection or a de-selection and act accordingly (usually you just
> ignore the de-selection event).
>
> -Rich
>
> Michael J. Olenik wrote:
> >
> > When I use the "ItemStateChanged" event in the JCombobox to see if
> > another item has been selected, I notice that the event fires TWICE.
>
> >
> > Can anyone lend some insight into why this happens and more
> importantly
> > can it be stopped it from firing twice when the State Changes?
> >
> > I have noticed that the "PropertyChange" even fires only once, so
> maybe
> > this is the correct event to look at.
> >
> > I have included a sample applet to demonstrate this.
> >
> > Thanks
> >
> > MIke
> >
> > =========== Begin Sample Code ============
> > package JComboBox;
> >
> > import java.awt.*;
> > import java.awt.event.*;
> > import java.applet.*;
> > import com.sun.java.swing.*;
> > import borland.jbcl.layout.*;
> > import java.beans.*;
> >
> > //import com.sun.java.swing.UIManager;
> > public class Applet1 extends JApplet {
> >   boolean isStandalone = false;
> >   BorderLayout borderLayout1 = new BorderLayout();
> >   JPanel jPanel1 = new JPanel();
> >   XYLayout xYLayout1 = new XYLayout();
> >   JComboBox jComboBox1 = new JComboBox();
> >   JComboBox jComboBox2 = new JComboBox();
> >
> >   //Construct the applet
> >
> >   public Applet1() {
> >   }
> > //Initialize the applet
> >
> >   public void init() {
> >     try {
> >     jbInit();
> >     }
> >     catch (Exception e) {
> >     e.printStackTrace();
> >     }
> >     jComboBox1.addItem("jComboBox1");
> >     jComboBox1.addItem("Line 1");
> >     jComboBox1.addItem("Line 2");
> >     jComboBox1.addItem("Line 3");
> >     jComboBox1.addItem("Line 4");
> >     jComboBox1.addItem("Line 5");
> >
> >     jComboBox2.addItem("jComboBox2");
> >     jComboBox2.addItem("Line 1");
> >     jComboBox2.addItem("Line 2");
> >     jComboBox2.addItem("Line 3");
> >     jComboBox2.addItem("Line 4");
> >     jComboBox2.addItem("Line 5");
> >
> >     System.out.println("End of Init");
> >   }
> > //Component initialization
> >
> >   private void jbInit() throws Exception {
> >     this.getContentPane().setLayout(borderLayout1);
> >     this.setSize(400,300);
> >     jPanel1.setLayout(xYLayout1);
> >     jComboBox2.addItemListener(new java.awt.event.ItemListener() {
> >       public void itemStateChanged(ItemEvent e) {
> >         jComboBox2_itemStateChanged(e);
> >       }
> >     });
> >     jComboBox1.addMouseListener(new java.awt.event.MouseAdapter() {
> >       public void mouseClicked(MouseEvent e) {
> >         jComboBox1_mouseClicked(e);
> >       }
> >       public void mouseEntered(MouseEvent e) {
> >         jComboBox1_mouseEntered(e);
> >       }
> >     });
> >     jComboBox2.addMouseListener(new java.awt.event.MouseAdapter() {
> >       public void mouseClicked(MouseEvent e) {
> >         jComboBox2_mouseClicked(e);
> >       }
> >     });
> >     jComboBox1.addPropertyChangeListener(new
> > java.beans.PropertyChangeListener() {
> >       public void propertyChange(PropertyChangeEvent e) {
> >         jComboBox1_propertyChange(e);
> >       }
> >     });
> >     jComboBox1.addVetoableChangeListener(new
> > java.beans.VetoableChangeListener() {
> >       public void vetoableChange(PropertyChangeEvent e) throws
> > PropertyVetoException {
> >         jComboBox1_vetoableChange(e);
> >       }
> >     });
> >     jComboBox1.addItemListener(new java.awt.event.ItemListener() {
> >       public void itemStateChanged(ItemEvent e) {
> >         jComboBox1_itemStateChanged(e);
> >       }
> >     });
> >     this.getContentPane().add(jPanel1, BorderLayout.CENTER);
> >     jPanel1.add(jComboBox1, new XYConstraints(28, 40, 227, -1));
> >     jPanel1.add(jComboBox2, new XYConstraints(30, 102, 218, -1));
> >   }
> > //Get Applet information
> >
> >   public String getAppletInfo() {
> >     return "Applet Information";
> >   }
> > //Get parameter info
> >
> >   public String[][] getParameterInfo() {
> >     return null;
> >   }
> >
> >   void jComboBox1_itemStateChanged(ItemEvent e) {
> >     System.out.println("Begin jComboBox1_itemStateChanged");
> >     System.out.println("End   jComboBox1_itemStateChanged");
> >   }
> >
> >   void jComboBox2_itemStateChanged(ItemEvent e) {
> >     System.out.println("Begin jComboBox2_itemStateChanged");
> >     System.out.println("End   jComboBox2_itemStateChanged");
> >   }
> >
> >   void jComboBox1_mouseClicked(MouseEvent e) {
> >     System.out.println("Begin jComboBox1_mouseClicked");
> >     System.out.println("End   jComboBox1_mouseClicked");
> >
> >   }
> >
> >   void jComboBox2_mouseClicked(MouseEvent e) {
> >     System.out.println("Begin jComboBox2_mouseClicked");
> >     System.out.println("End   jComboBox2_mouseClicked");
> >
> >   }
> >
> >   void jComboBox1_mouseEntered(MouseEvent e) {
> >     System.out.println("Begin jComboBox1_mouseEntered");
> >     System.out.println("End   jComboBox1_mouseEntered");
> >
> >   }
> >
> >   void jComboBox1_propertyChange(PropertyChangeEvent e) {
> >     System.out.println("Begin jComboBox1_propertyChange");
> >     System.out.println("End   jComboBox1_propertyChange");
> >
> >   }
> >
> >   void jComboBox1_vetoableChange(PropertyChangeEvent e) throws
> > PropertyVetoException {
> >     System.out.println("Begin jComboBox1_vetoableChange");
> >     System.out.println("End   jComboBox1_vetoableChange");
> >
> >   }
> > }
> > =========== End Sample Code ============
>
> --
>
> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
> Rich Wilkman
> Senior Quality Assurance Engineer
> Borland JBuilder Team
>
> If you see something that looks like an opinion up there,
> it's mine and mine alone.
>
> Mail sent to me from the newsgroups won't bounce but will
> be ignored.  If I have time, I'll respond, but you  have
> a better chance if you confine your posts to the newsgroups
> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=



--
William P. Glocker
Co-Founder - Knowledge Design, Inc.
Voice: 719-260-8117  Fax: 719-592-9697
email: bill.glocker@bigfoot.com