EditorWindow.OnInspectorUpdate()

Description

OnInspectorUpdate is called at 10 frames per second to give the inspector a chance to update.

Align position of the selected objects.

using UnityEditor;
using UnityEngine;
using System.Collections;

// Simple script that aligns the position of several selected GameObjects
// with the first selected one.

public class Example : EditorWindow
{
    bool alignToX = true;
    bool alignToY = true;
    bool alignToZ = true;
    string selected = "";
    string alignTo = "";

    [MenuItem("Example/OnInspectorUpdate example")]
    static void Init()
    {
        Example window = (Example)GetWindow(typeof(Example));
        window.Show();
    }

    void  OnInspectorUpdate()
    {
        // Call Repaint on OnInspectorUpdate as it repaints the windows
        // less times as if it was OnGUI/Update
        Repaint();
    }

    void  OnGUI()
    {
        GUILayout.Label("Select various Objects in the Hierarchy view");
        selected = Selection.activeTransform ? Selection.activeTransform.name : "";

        foreach (Transform t in Selection.transforms)
        {
            if (t.GetInstanceID() != Selection.activeTransform.GetInstanceID())
            {
                alignTo += t.name + " ";
            }
        }

        EditorGUILayout.LabelField("Align: ", alignTo);
        alignTo = "";
        EditorGUILayout.LabelField("With: ", selected);

        alignToX = EditorGUILayout.Toggle("X", alignToX);
        alignToY = EditorGUILayout.Toggle("Y", alignToY);
        alignToZ = EditorGUILayout.Toggle("Z", alignToZ);

        if (GUILayout.Button("Align"))
        {
            Align();
        }
    }

    void Align()
    {
        if (selected == "" || alignTo == "")
        {
            Debug.LogError("No objects selected to align");
        }

        foreach (Transform t in Selection.transforms)
        {
            Vector3 alignementPosition = Selection.activeTransform.position;
            Vector3 newPosition;

            newPosition.x = alignToX ? alignementPosition.x : t.position.x;
            newPosition.y = alignToY ? alignementPosition.y : t.position.y;
            newPosition.z = alignToZ ? alignementPosition.z : t.position.z;

            t.position = newPosition;
        }
    }
}