[Unity]Convert Compnents

/// <summary>
/// 取代Script用。
/// 例如做了一支ImagePlus，想要取代某個GameObject內所有的Image Script，可以使用這支code來執行
/// 2020-01 kumako
/// </summary>
[CanEditMultipleObjects]
public class ComponentConvertTool : EditorWindow
{

        private MonoScript m_TargetScript;
        private GameObject m_TargetGameObject;
        private string[] m_GameObjectStrAry;
        private bool[] m_GameObjectToogleAry;
        private Object[] m_ObjectAry;
        private int[] m_ObjectHashCodeAry;
        private string m_LogStr;

        private Vector2 m_ScrollPos;
        private int m_GameObjectCount = 0;
        private GUIStyle m_ObjectUnchoosedStyle, m_ObjectChoosedStyle;
        private GUIStyle m_ObjectListStyle;

        [MenuItem("Tools/ConvertComponents")]
        public static void ShowWindow()
        {
            EditorWindow.GetWindow(typeof(ComponentConvertTool), false, "Component Convert Tool");
        }
        
        private void OnGUI()
        {
            if (m_ObjectListStyle == null)
            {
                m_ObjectListStyle = new GUIStyle(GUI.skin.box);
            }
            if (m_ObjectUnchoosedStyle == null)
            {
                m_ObjectUnchoosedStyle = new GUIStyle(GUI.skin.label);
                m_ObjectUnchoosedStyle.alignment = TextAnchor.MiddleLeft;
                m_ObjectUnchoosedStyle.normal.textColor = Color.gray;
            }
            if (m_ObjectChoosedStyle == null)
            {
                m_ObjectChoosedStyle = new GUIStyle(GUI.skin.label);
                m_ObjectChoosedStyle.alignment = TextAnchor.MiddleLeft;
                m_ObjectChoosedStyle.normal.textColor = Color.white;
            }
            EditorGUI.BeginChangeCheck();
            EditorGUILayout.BeginHorizontal();
            GUILayout.Label("Target script:");
            m_TargetScript = EditorGUILayout.ObjectField(m_TargetScript, typeof(MonoScript), true) as MonoScript;
            EditorGUILayout.EndHorizontal();

            EditorGUILayout.BeginHorizontal();
            GUILayout.Label("Be Convert GameObject/Group: ");
            m_TargetGameObject = EditorGUILayout.ObjectField(m_TargetGameObject, typeof(GameObject), true) as GameObject;
            EditorGUILayout.EndHorizontal();
            if (EditorGUI.EndChangeCheck())
            {
                if (m_TargetScript != null)
                {
                    if (m_TargetGameObject != null)
                    {
                        DoSomething("ShowTargetObject");
                    }
                    else
                    {
                        m_LogStr = "";
                        m_GameObjectStrAry = null;
                        m_GameObjectCount = 0;
                    }
                }
                else
                {
                    m_LogStr = "";
                    m_GameObjectStrAry = null;
                    m_GameObjectCount = 0;
                }
            }
            EditorGUILayout.BeginHorizontal();
            GUILayout.Label("Include GameObject List:");
            if (GUILayout.Button("All"))
            {
                for (int i = 0; i < m_GameObjectCount; i++)
                {
                    m_GameObjectToogleAry[i] = !m_GameObjectToogleAry[i];
                }
            }
            EditorGUILayout.EndHorizontal();
            if (m_GameObjectCount > 0)
            {
                if (m_GameObjectToogleAry == null || m_GameObjectToogleAry.Length != m_GameObjectCount)
                {
                    m_GameObjectToogleAry = new bool[m_GameObjectCount];
                    for (int i = 0; i < m_GameObjectCount; i++)
                        m_GameObjectToogleAry[i] = true;
                }
                EditorGUILayout.BeginVertical(m_ObjectListStyle);
                m_ScrollPos = EditorGUILayout.BeginScrollView(m_ScrollPos, false, false);
                for (int i = 0; i < m_GameObjectCount; i++)
                {
                    EditorGUILayout.BeginHorizontal();
                    m_GameObjectToogleAry[i] = EditorGUILayout.Toggle(m_GameObjectToogleAry[i], GUILayout.Width(20));
                    //GUILayout.Label(m_GameObjectStrAry[i], m_GameObjectToogleAry[i] ? m_ObjectChoosedStyle : m_ObjectUnchoosedStyle);
                    if (GUILayout.Button(m_GameObjectStrAry[i], m_GameObjectToogleAry[i] ? m_ObjectChoosedStyle : m_ObjectUnchoosedStyle))
                    {
                        Selection.activeInstanceID = m_ObjectHashCodeAry[i];
                    }
                    EditorGUILayout.EndHorizontal();
                }
                EditorGUILayout.EndScrollView();
                EditorGUILayout.EndVertical();
                if (GUILayout.Button("Convert"))
                {
                    m_LogStr = "";
                    if (m_TargetScript == null || m_TargetGameObject == null)
                    {
                        GUILayout.Label("ERROR! Targets are NULL", EditorStyles.boldLabel);
                    }
                    else
                    {
                        DoSomething("DoConvert");
                    }
                }
            }
            
            GUILayout.Label(m_LogStr, EditorStyles.helpBox);
        }

        private void DoSomething(string MethodName)
        {
            System.Type t = m_TargetScript.GetClass().BaseType;
            var method = typeof(ComponentConvertTool).GetMethod(MethodName);
            if (method != null)
            {
                var fooRef = method.MakeGenericMethod(t);
                fooRef.Invoke(this, null);
            }
            else
            {
                Debug.Log("ERROR!Can't Find this Method:" + MethodName);
            }
        }

        public void ShowTargetObject<T>()
        {
            T[] oAry = m_TargetGameObject.GetComponentsInChildren<T>(true);
            m_GameObjectCount = oAry.Length;
            m_GameObjectStrAry = new string[m_GameObjectCount];
            m_ObjectAry = new Object[m_GameObjectCount];
            m_ObjectHashCodeAry = new int[m_GameObjectCount];
            for (int i = 0; i < m_GameObjectCount; i++)
            {
                m_ObjectAry[i] = oAry[i] as Object;
                m_ObjectHashCodeAry[i] = oAry[i].GetHashCode();
                m_GameObjectStrAry[i] += oAry[i].ToString();
            }
            if (oAry.Length == 0)
            {
                m_LogStr = "NO Script Match BaseType("+typeof(T).ToString()+")";
            }
        }

        public void DoConvert<T>()
        {
            for (int i = 0;i < m_GameObjectCount; i++)
            {
                if (m_GameObjectToogleAry[i])
                {
                    Object o = m_ObjectAry[i];
                    var so = new SerializedObject(o);
                    so.Update();
                    so.FindProperty("m_Script").objectReferenceValue = m_TargetScript;
                    so.ApplyModifiedProperties();
                }
            }
            DoSomething("ShowTargetObject");
        }
}