GUILayoutx.cs

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using UnityEngine;

public class GUILayoutx {
    
    public delegate void DoubleClickCallback(int index);
   
    public static int SelectionList(int selected, GUIContent[] list) {
        return SelectionList(selected, list, "List Item", null);
    }
   
    public static int SelectionList(int selected, GUIContent[] list, GUIStyle elementStyle) {
        return SelectionList(selected, list, elementStyle, null);
    }
   
    public static int SelectionList(int selected, GUIContent[] list, DoubleClickCallback callback) {
        return SelectionList(selected, list, "List Item", callback);
    }
   
    public static int SelectionList(int selected, GUIContent[] list, GUIStyle elementStyle, DoubleClickCallback callback) {
        for (int i = 0; i < list.Length; ++i) {
            Rect elementRect = GUILayoutUtility.GetRect(list[i], elementStyle);
            bool hover = elementRect.Contains(Event.current.mousePosition);
            if (hover && Event.current.type == EventType.MouseDown && Event.current.clickCount == 1 ) {
                selected = i;
                Event.current.Use();
            } else if (hover && callback != null && Event.current.type == EventType.MouseDown && Event.current.clickCount == 2) {
                callback(i);
                Event.current.Use();
            } else if (Event.current.type == EventType.repaint) {
                elementStyle.Draw(elementRect, list[i], hover, false, i == selected, false);
            }
        }
        return selected;
    }
   
    public static int SelectionList(int selected, string[] list) {
        return SelectionList(selected, list, "List Item", null);
    }
   
    public static int SelectionList(int selected, string[] list, GUIStyle elementStyle) {
        return SelectionList(selected, list, elementStyle, null);
    }
   
    public static int SelectionList(int selected, string[] list, DoubleClickCallback callback) {
        return SelectionList(selected, list, "List Item", callback);
    }
   
    public static int SelectionList(int selected, string[] list, GUIStyle elementStyle, DoubleClickCallback callback) {
        for (int i = 0; i < list.Length; ++i) {
            Rect elementRect = GUILayoutUtility.GetRect(new GUIContent(list[i]), elementStyle);
            bool hover = elementRect.Contains(Event.current.mousePosition);
            if (hover && Event.current.type == EventType.MouseDown && Event.current.clickCount == 1) {
                selected = i;
                Event.current.Use();
            } else if (hover && callback != null && Event.current.type == EventType.MouseDown && Event.current.clickCount == 2) {
                callback(i);
                Event.current.Use();
            } else if (Event.current.type == EventType.repaint) {
                elementStyle.Draw(elementRect, list[i], hover, false, i == selected, false);
            }
        }
        return selected;
    }
   
}