There is no 'lost focus' event with the GTextField control (there never was) but the GTextfield will fire an ENTERED event when the Enter/Return key is pressed. The code below demonstrates this.

1. import g4p_controls.*;
2. GTextField txf;
3. 
   
4. public void setup(){
5.   size(300,300);
6.   txf = new GTextField(this, 10, 10, 120, 20);
7. }
8. 
   
9. public void draw(){
10.   background(128);
11. }
12. 
    
13. public void handleTextEvents(GEditableTextControl textcontrol, GEvent event) {
14.   if(textcontrol == txf && event == GEvent.ENTERED){
15.     println("Entered key pressed");
16.   }
17. }

The GTextArea control does not fire this event because the enter key is used to start a new line.

Thanks for your reply. So, I think I need to work around using hasFocus() function.

It should be fairly straightforward to create lost and gain focus events for GTextField and GTextArea controls. If you would like to see this included in the G4P library then post it as an enhancment request here.

Thanks quarks, I've just created an issue  http://code.google.com/p/gui4processing/issues/detail?id=14

Don't worry GoogleCode is like that it is upto the owner to change the type and I have just done that.