GetRoot not accessible

Question

Hi EW Team,
I am developing an event input screen in my GUI.


When I try to lonad the getRoot() component to define the VirtualKeyboard property, the Core::Root object returned is null. How can it be?

Answer 1

Alright, I think I solved it by using inside my init() a postsignal to a slot LateInit with the initialization of the VirtualKeyboard in it.

Comments

Hello Velas,

GetRoot() searches for the root object of the view tree. Therefore it works only for components which are part of the view tree (see also Understand the view tree and the Owner relationships). If the component is not belonging to the view tree, then GetRoot() can't find the root object and returns null. This is also the case for a just created instance of a component when it's Init() method is executed.

In version 12 we added a new global variable named rootthis. Using this variable you can access the root object from elsewhere, even form non-visual objects like a Device Interface. This enhancement should simplify the access to the view tree and its root object.

Best regards

Paul Banach