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Assets/Scripts/DrawIfAttribute.cs

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+
+using UnityEngine;
+using System;
+
+/// <summary>
+/// Draws the field/property ONLY if the compared property compared by the comparison type with the value of comparedValue returns true.
+/// Based on: https://forum.unity.com/threads/draw-a-field-only-if-a-condition-is-met.448855/
+/// </summary>
+[AttributeUsage(AttributeTargets.Property | AttributeTargets.Field, AllowMultiple = true)]
+public class DrawIfAttribute : PropertyAttribute
+{
+    #region Fields
+
+    public string comparedPropertyName { get; private set; }
+    public object comparedValue { get; private set; }
+    public DisablingType disablingType { get; private set; }
+    public Comparator comparisonMethod { get; private set; }
+
+    /// <summary>
+    /// Types of comperisons.
+    /// </summary>
+    public enum DisablingType
+    {
+        ReadOnly = 2,
+        DontDraw = 3
+    }
+    public enum Comparator
+    {
+        Equal=0,
+        NotEqual=1
+    }
+
+    #endregion
+
+    /// <summary>
+    /// Only draws the field only if a condition is met. Supports enum and bools.
+    /// </summary>
+    /// <param name="comparedPropertyName">The name of the property that is being compared (case sensitive).</param>
+    /// <param name="comparedValue">The value the property is being compared to.</param>
+    /// <param name="disablingType">The type of disabling that should happen if the condition is NOT met. Defaulted to DisablingType.DontDraw.</param>
+    public DrawIfAttribute(string comparedPropertyName, object comparedValue, DisablingType disablingType = DisablingType.ReadOnly, Comparator comparisonMethod=Comparator.Equal)
+    {
+        this.comparedPropertyName = comparedPropertyName;
+        this.comparedValue = comparedValue;
+        this.disablingType = disablingType;
+        this.comparisonMethod = comparisonMethod;
+    }
+}