uGUIのリセットボタン

NGUIはpositionなどのリセットが便利。 ※デフォルトのは出ないのは注意！

http://answers.unity3d.com/questions/1076559/how-do-i-get-the-default-inspector-for-a-customedi.html

RectTransformでも同じことをしたい。

NGUIはNGUITransformInspector.csにある。 uGUIでも使いたいので移植。 RectTransform.csをEditorに入れて使おう。

using UnityEngine;
using UnityEditor;
using System.Collections;
using UnityEngine.UI;

[CustomEditor(typeof(RectTransform))]
public class RectTransformInspector : Editor
{
    static public RectTransformInspector instance;

    static public void SetLabelWidth (float width)
    {
#if UNITY_3_5 || UNITY_4_0 || UNITY_4_1 || UNITY_4_2 || UNITY_5_4
        EditorGUIUtility.LookLikeControls(width);
#else
        EditorGUIUtility.labelWidth = width;
#endif
    }

    void OnDestroy () { instance = null; }

    public override void OnInspectorGUI ()
    {
        // デフォルトも表示させる場合が・・できない.
        DrawDefaultInspector();

        RectTransform trans = target as RectTransform;
        SetLabelWidth (15f);

        Vector3 pos;
        Vector3 rot;
        Vector3 scale;

        // Position
        EditorGUILayout.BeginHorizontal ();
        {
            if (DrawButton ("P", "Reset Position", IsResetPositionValid (trans), 20f))
            {
                RegisterUndo ("Reset Position", trans);
                trans.localPosition = Vector3.zero;
            }
            pos = DrawVector3 (trans.localPosition);
        }
        EditorGUILayout.EndHorizontal ();

        // Rotation
        EditorGUILayout.BeginHorizontal ();
        {
            if (DrawButton ("R", "Reset Rotation", IsResetRotationValid (trans), 20f))
            {
                RegisterUndo ("Reset Rotation", trans);
                trans.localEulerAngles = Vector3.zero;
            }
            rot = DrawVector3 (trans.localEulerAngles);
        }
        EditorGUILayout.EndHorizontal ();

        // Scale
        EditorGUILayout.BeginHorizontal ();
        {
            if (DrawButton ("S", "Reset Scale", IsResetScaleValid (trans), 20f))
            {
                RegisterUndo ("Reset Scale", trans);
                trans.localScale = Vector3.one;
            }
            scale = DrawVector3 (trans.localScale);
        }
        EditorGUILayout.EndHorizontal ();
    }

    /// <summary>
    /// Helper function that draws a button in an enabled or disabled state.
    /// </summary>
    static bool DrawButton (string title, string tooltip, bool enabled, float width)
    {
        if (enabled)
        {
            // Draw a regular button
            return GUILayout.Button (new GUIContent (title, tooltip), GUILayout.Width (width));
        }
        else
        {
            // Button should be disabled -- draw it darkened and ignore its return value
            Color color = GUI.color;
            GUI.color = new Color (1f, 1f, 1f, 0.25f);
            GUILayout.Button (new GUIContent (title, tooltip), GUILayout.Width (width));
            GUI.color = color;
            return false;
        }
    }

    /// <summary>
    /// Helper function that determines whether its worth it to show the reset position button.
    /// </summary>
    static bool IsResetPositionValid (Transform targetTransform)
    {
        Vector3 v = targetTransform.localPosition;
        return (v.x != 0f || v.y != 0f || v.z != 0f);
    }

    /// <summary>
    /// Helper function that determines whether its worth it to show the reset rotation button.
    /// </summary>
    static bool IsResetRotationValid (Transform targetTransform)
    {
        Vector3 v = targetTransform.localEulerAngles;
        return (v.x != 0f || v.y != 0f || v.z != 0f);
    }

    /// <summary>
    /// Helper function that determines whether its worth it to show the reset scale button.
    /// </summary>
    static bool IsResetScaleValid (Transform targetTransform)
    {
        Vector3 v = targetTransform.localScale;
        return (v.x != 1f || v.y != 1f || v.z != 1f);
    }

    /// <summary>
    /// Helper function that draws a field of 3 floats.
    /// </summary>
    static Vector3 DrawVector3 (Vector3 value)
    {
        GUILayoutOption opt = GUILayout.MinWidth (30f);
        value.x = EditorGUILayout.FloatField ("X", value.x, opt);
        value.y = EditorGUILayout.FloatField ("Y", value.y, opt);
        value.z = EditorGUILayout.FloatField ("Z", value.z, opt);
        return value;
    }

    /// <summary>
    /// Create an undo point for the specified objects.
    /// </summary>
    static public void RegisterUndo (string name, params Object[] objects)
    {
        if (objects != null && objects.Length > 0)
        {
#if UNITY_3_5 || UNITY_4_0 || UNITY_4_1 || UNITY_4_2
            UnityEditor.Undo.RegisterUndo(objects, name);
#else
            UnityEditor.Undo.RecordObjects (objects, name);
#endif
            foreach (Object obj in objects)
            {
                if (obj == null)
                {
                    continue;
                }
                EditorUtility.SetDirty (obj);
            }
        }
    }
}

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