【筆記】自定義Inspector篇：Hide in Inspector

                   ↓



Code與Infomation源頭：Hide in Inspector

在自定義Unity編輯面板中，其中一個有趣的顯示方式：勾選其中一個Boolean值來決定是否在Inspector上顯示該項目。



使用HideUnlessAttribute.cs與HideUnlessAttributeDrawer.cs以及HideableAttributeDrawer.cs語法後，我們可以這樣寫就會呈現本文章圖片的模式：

    public bool StartPositionNoRandom = false;
    [HideUnless("StartPositionNoRandom")]
    public Vector2 StartPosition;

目前測試結果，不能用這方法來隱藏參數的類型有：

• List
• 你自己設置的Class，你只會讀到一行標頭

---

修正版本
自定義Class可以顯示的修正，包含要重新計算Height、還有最關鍵的EditorGUI.PropertyField的第四個屬性。

HideableAttributeDrawer class

// --------------------------------
// 
//     Copyright (C) Rumor Games, LLC.  All rights reserved.
//     Modified by BearuBox
// 
// --------------------------------

using UnityEditor;
using UnityEngine;

/// 

/// HideableAttributeDrawer class.
/// 
public abstract class HideableAttributeDrawer : PropertyDrawer
{
    /// 

    /// Draws the GUI for the property.
    /// 
    /// Rectangle on the screen to use for the property GUI.    /// The SerializedProperty to make the custom GUI for.    /// The label of this property.    public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
    {
        if (!this.IsHidden(property))
        {
            position.height = _GetRealHeight(property, label);
            EditorGUI.PropertyField(position, property, label, true);
        }
    }

    /// 

    /// Get the property height in pixels of the given property.
    /// 
    /// The SerializedProperty to get height for.    /// The label of this property.    public override float GetPropertyHeight(SerializedProperty property, GUIContent label)
    {
        float Height = _GetRealHeight(property, label);
        return this.IsHidden(property) ? 0f : Height;
    }

    /// 

    /// Checks whether the property is supposed to be hidden.
    /// 
    /// The SerializedProperty to test.    /// True if the property should be hidden.
    protected abstract bool IsHidden(SerializedProperty property);

    private float _GetRealHeight(SerializedProperty property, GUIContent label)
    {
        float Height = base.GetPropertyHeight(property, label);
        if (property.isExpanded)
        {
            Height *= (fieldInfo.FieldType.GetFields().Length + 1);
        }
        return Height;
    }