4.6 uGUI Hierarchy Z Sort

Unity Engine
1

i got an interface here that depends on z order
i was wondering if and how something like this would be possible with the new uGUI since z order is ignored?
thanks

i guess each window needs to be a world space canvas?

2

If you put this script on the canvas object, it will bubble-sort the elements in the canvas, changing the order of the canvas children. (I’m comparing position.z’s here, but you can use any criteria)

int k = transform.childCount;
Transform childI;
Transform childJ;

for( int i = 0; i < k; i++ ){

    for( int j = 0; j < k; j++ ){
      
        if( i == j )
            continue;

        childI = transform.GetChild( i );
        childJ = transform.GetChild( j );

        if( childI.position.z > childJ.position.z ){

            int tempIndex = childJ.GetSiblingIndex();

            childJ.SetSiblingIndex( childI.GetSiblingIndex() );
            childI.SetSiblingIndex( tempIndex );

        }
      
    }
  
}
2 Likes
3

thanks. i recently got it to work like this.

using UnityEngine;
using System.Linq;
public static class GameObjectExtensions
{
    public static void SortChildren(this GameObject gameObject)
    {
        var children = gameObject.GetComponentsInChildren<Transform>(true);
        var sorted = from child in children
                     orderby child.gameObject.activeInHierarchy descending, child.localPosition.z descending
                     where child != gameObject.transform
                     select child;
        for (int i = 0; i < sorted.Count(); i++)
        {
            sorted.ElementAt(i).SetSiblingIndex(i);
        }
    }
}
4

i am using a single Screen Space Camera Canvas instead of a bunch of World Canvases as i expected…

the sorting would be easier with world space but then stretching to screen and reference resolution do not work i guess