i overcome this problem by recreating the window if it has been closed.
it's not ideal, but works ok !

i create the window in a parallel thread so that it has a minimal impact on the framerate.
 

1.  public void toggleVisiblity(){
   
           if(controlP5.window(windowName)==null){
               //make a new window if it has been closed
               reCreateWindow();
           }else{
               if(visible){
                   hide();
               }else{
                   show();
               }
           }
       }
2.     private void reCreateWindow(){
           class createWindowThread extends Thread {
               public createWindowThread() {
                   super();
               }
               public void run() {
                   //flag the interface as not in sync with the layers
                   ready=false;
                   controlWindow = controlP5.addControlWindow(windowName,100,100,windowW,windowH);
3.                   //recreate your controls in setup
                   setup();
                   //sync the interface with the data
                   update();
                   //flag the interface as in sync with the layers
                   ready=true;
                   //hop
                   visible=true;
               }
           }
           createWindowThread async = new createWindowThread();
           async.start();
       }
   
   

i hope this helps !

h

Hi,
Thanks for the feedback.
I tried this workaround but i think you are using your own hide() function.
If i try to use the controlP5 method hide()

1. controlWindow.hide();

the code

1. if (controlP5.window("Settings")==null) {
         println("closed")    ;
       }
       else{
         println("open");
       }

always gives "open", which i guess is right, as i did not remove it.
Does this really work for you ?
And if i try to remove the controlWindow with

1. controlWindow.remove();

the controlWindow does not close, but if i click on it it gets black and i get an "InvocationTargetException" error, so i guess it has been removed but not really ?

Thanks
tc

my hide and show function have nothing special :)

1.     public void hide(){
           if(controlWindow!=null){
               this.controlWindow.hide();
           }else{
               this.controlP5.hide();
           }
           visible=false;
       }
       public void show(){
           if(controlWindow!=null){
               this.controlWindow.show();
           }else{
               this.controlP5.show();
           }
           visible=true;
       }

this really works for me :)
if i understand correctly, closing the windows release the controlWindow object and all its ressources. while showing the window again i check if the window exist     if(controlP5.window(windowName)==null){
if not i recreate it from scratch (exactly like when i start the program the first time).

strange
When i print

1. if(controlWindow!=null){
         println("open");
   }else{
         println("closed");

}
I always get open once addControlWindow has been called.
Anyways, if i capture one controller from the controlWindow it works

1. if (controlP5.controller("Speed") == null && started == true) {     
         controlP5.controller("showSettings").setValue(0);
         started = false;
   }

Speed is locatedto the control window, not the main window.
This gets me controlP5.controller("Speed") == null when the window is closed via the Wnows "X" button.
This is the same as

1. controlWindow.clear();

But even if i try to remove the  window with

1. controlWindow.remove();

the controlwindow instance is not deleted as it seems.
controlP5.window(windowName) is not null.

Calling a new addControlWindow("Settings") gives me
"ControlWindow with name Settings already exists".

Well..  at least it works, but i do not like Warnings :)
Maybe its a win7 x64 problem ?

Anyways thanks a lot for helping
greets, tc

controlP5.window(windowName)==null

is not the same as

controllWindow==null.

in the first case you get the reference to the window, that is not valid anymore, as it has been closed (hence the error you get.). the object is there but its ressources have been released i suppose.
in the second case you ask controlp5 to return you the window. as the window does not exist it will return null.

i always get a warning : "window does not exist, returning null" or something. when calling controlP5.window(windowName).