ComputedNode's size returns 0.0 with Added filter in Query

[MuongKimhong]

I'm trying to get width & height of a Node, but ComputedNode gives me 0.0.

fn my_system(query: Query<(&ComputedNode, &Node), Added<MyComponent>>) {
    for (computed_node, node) in query.iter() {
        println!("{:?}", computed_node.size()); // always return Vec2(0.0, 0.0)
        println!("{:?}", node.width); // Val::Percent(100.0)
    }
}

If i remove Added filter, i can see the actual width & height but i need to use Added filter. What am I missing?

[ickshonpe]

My guess is that my_system is running before ui_layout_system has updated the ComputedNode's size the first time.
And without the filter it prints out the size every frame so the last size it prints out will be non-zero.
Try changing my_system's query filter to:

query: Query<(&ComputedNode, &Node), Or<(Added<MyComponent>, Changed<ComputedNode>)>>,

And you should see that the first frame it prints Vec2(0.0, 0.0) and then the next frame it prints the computed size of the node.

[MuongKimhong]

Perfect! Thank you.