When will com.itmill.toolkit.ui.AbstractComponent.getApplication return nul

General
1

Hi,

Sometimes I need to get a handle to the Application object inside a CustomComponent but getApplication() returns null. Why is this? When will getApplication() return null and is there a way to get to the Application object when it does?

Thank you for your attention,

Johnny

2

Hmm…

Are you sure that when you do the .getApplication() , your component has been added to your application ?

getApplication() can only be called after the component is attached to the app.

Quentin.

3

Quentin,

Actually, at the time getApplication() is called, my CustomComponent is in the process of being added to a window - getApplication() is called in the CustomComponent’s constructor. From what you write I can’t call getApplication() there. So, how can I get hold of the application object in the constructor of a CustomComponent?

Best regards,

Johnny

4

Well… Calling getApplication() in the constructor is something that just do not work - well, at least it never worked for me :stuck_out_tongue:
By definition, in the constructor of the CustomComponent, the component is not yet added to the application - and thus cannot access it.
If you really, really need that, maybe sending the application as constructor parameter ?

What I do when I need to init a component using the application is either to use a separate init method that I call after I added the component ; or on some tricky case, override the attach() method on the CustomComponent (calling super.attach() on the first line, and then doing all the specific init).

Quentin.

5

Thanks, either should do the trick.

Best regards,

Johnny