unity ReorderableList鼠标右键回调

要在Unity的ReorderableList中实现鼠标右键回调，可以使用UnityEditor.GenericMenu类。首先，在ReorderableList的OnGUI函数中，检测是否有鼠标右键按下事件，如果有，则创建一个GenericMenu对象，并添加菜单项。然后，调用GenericMenu的ShowAsContext函数，以显示右键菜单。

以下是一个示例代码，用于在ReorderableList中实现鼠标右键回调：

using UnityEditor;
using UnityEditorInternal;
using UnityEngine;

public class Example : EditorWindow
{
    private ReorderableList list;

    [MenuItem("Window/Example")]
    private static void ShowWindow()
    {
        GetWindow<Example>("Example");
    }

    private void OnEnable()
    {
        list = new ReorderableList(serializedObject, serializedObject.FindProperty("list"), true, true, true, true);

        list.drawElementCallback = (rect, index, isActive, isFocused) =>
        {
            var element = list.serializedProperty.GetArrayElementAtIndex(index);
            rect.y += 2;
            EditorGUI.PropertyField(new Rect(rect.x, rect.y, rect.width, EditorGUIUtility.singleLineHeight), element);
        };

        list.drawHeaderCallback = rect =>
        {
            EditorGUI.LabelField(rect, "List");
        };

        list.onAddCallback = list =>
        {
            var index = list.serializedProperty.arraySize;
            list.serializedProperty.arraySize++;
            list.index = index;
        };

        list.onRemoveCallback = list =>
        {
            if (EditorUtility.DisplayDialog("Delete item", "Are you sure?", "Yes", "No"))
            {
                ReorderableList.defaultBehaviours.DoRemoveButton(list);
            }
        };

        list.onMouseUpCallback = list =>
        {
            if (Event.current.button == 1 && list.index >= 0 && list.index < list.serializedProperty.arraySize)
            {
                var menu = new GenericMenu();
                menu.AddItem(new GUIContent("Option 1"), false, () =>
                {
                    Debug.Log("Option 1 selected");
                });
                menu.AddItem(new GUIContent("Option 2"), false, () =>
                {
                    Debug.Log("Option 2 selected");
                });
                menu.ShowAsContext();
                Event.current.Use();
            }
        };
    }

    private void OnGUI()
    {
        serializedObject.Update();
        list.DoLayoutList();
        serializedObject.ApplyModifiedProperties();
    }
}

在这个示例中，我们在ReorderableList的onMouseUpCallback函数中检测鼠标右键按下事件，并创建一个带有两个菜单项的GenericMenu对象。当菜单项被选中时，会调用相应的回调函数。在这个示例中，我们只是简单地记录了选中的菜单项，但你可以根据需要执行任何操作。