Possible to set ConfirmDialog Synchronous?

[JJarrie]

Hi,

I tried to make a user's validation on each object of a collection (in a loop), but actually ConfirmDialog.show() isn't blocking and the loop finish before to display it.

Have you an issue for this case? Or it's impossible actually?

Thank

(Sorry for my English)

[samie]

Yes, you right. The underlying communication is still asynchronous (XHR most likely). So if you want to pipeline them (one after another) you need to chain the callbacks. Or maybe a place to use Java 8 stream APIs?

[mvysny]

This is definitely not possible. The Vaadin UI thread cannot block in the show() method - it must finish and deliver the new content (along with the dialog to be shown) to the browser.
The only way this could be done is via continuations: https://kotlinlang.org/docs/reference/coroutines.html

[mvysny]

Please read this blogpost regarding blocking dialogs: http://mavi.logdown.com/posts/3488105
Here is a sample project: https://github.com/mvysny/vaadin-coroutines-demo