Vaadin popup should show and hide in the click event makes no appear popup

Question

Having a

  public void buttonClick(ClickEvent event) {
             MyPopup popup = new MyPopup();
             getWindow().addWindow(popup);
             log.warn("Added POPUP");
    //lot of method calling here then
         getWindow().removeWindow(popup);
             log.warn("Removed Popup");
}

I would expect to show a popup window and after some milisecundom (after the expensive method calls) it should hide itself. The log says :

2014-02-19 15:26:51 WARN  xyzClass:82 - Added POPUP
2014-02-19 15:26:51 WARN  xyzClass:135 - Removed Popup

But the truth is that there is no popup showing here.

If i only show it, and not remove it later (the popup will show) public void buttonClick(ClickEvent event) { MyPopup popup = new MyPopup(); getWindow().addWindow(popup); log.warn("Added POPUP"); //lot of method calling here then log.warn("Removed Popup"); }

My main reason for this i want to achieve a glasspanel/loading screen functionality @ Vaadin, and not had found better solution yet. Any solution/description why the popup not shown up i would appreciate

Answer 1

Just do not have time to render it. You add it and immediately remove. Try this approach, for example:

private MyPopup popup;
public void buttonClick(ClickEvent event) {
    Thread workThread = new Thread() {
        @Override
        public void run() {         
            // some initialization here 
            getWindow().removeWindow(popup);
        }
    };
   workThread.start();             
   popup = new MyPopup();
   getWindow().addWindow(popup);
}

Answer 2

Depending on Vaadin version you can make use of ICEPush plugin (Vaadin 6) or built-in feature called Server Push (Vaadin 7).

public void buttonClick(ClickEvent event) {
    MyPopup popup = new MyPopup();
    getWindow().addWindow(popup);
    log.warn("Added POPUP");
    // start background thread with ICEPush or ServerPush
}

// Background thread in a separate class
// update UI accordingly when thread finished the job
    getWindow().removeWindow(popup);
    log.warn("Removed Popup");

Thanks to it you can move your time-consuming operations to another class thus decouple your business logic from the presentation layer. You can find examples of usage in the links above.