Add method button attribute.

Author: GlassToeStudio

Assets/CustomMethodButton.meta

@@ -0,0 +1,22 @@
+using UnityEngine;
+
+/// <summary>
+/// Usage:
+/// <para>   #if UNITY_EDITOR</para>
+/// <para>   [MethodButton("MethodName1", "MethodName2", "MethodNameN")]  // Must match a public method name!</para>
+/// <para>   [SerializeField] private bool showButtons; // this bool is mandatory!</para>
+/// <para>   #endif</para>
+/// </summary>
+public class MethodButtonAttribute : PropertyAttribute
+{
+    /// <summary>
+    /// Array of different method names for which a button will be displayed.
+    /// <para>"MethodOne", MethodTwo" ... "MethodN"</para>
+    /// </summary>
+    public string[] MethodNames { get; set; }
+
+    public MethodButtonAttribute(params string[] args)
+    {
+        MethodNames = args;
+    }
+}

Assets/CustomMethodButton/Attributes.meta

@@ -0,0 +1,60 @@
+using UnityEngine;
+using UnityEditor;
+
+[CustomPropertyDrawer(typeof(MethodButtonAttribute))]
+public class MethodButtonAttributeDrawer : PropertyDrawer
+{
+    private int i;
+    private float buttonHeight = EditorGUIUtility.singleLineHeight;
+    private MethodButtonAttribute attr;
+    
+    public override void OnGUI(Rect position, SerializedProperty editorFoldout, GUIContent label)
+    {
+        if (editorFoldout.name.Equals("editorFoldout") == false)
+        {
+            LogErrorMessage(editorFoldout);
+            return;
+        }
+
+        i = 0;
+        Rect foldoutRect = new Rect(position.x, position.y, position.width, buttonHeight);
+        editorFoldout.boolValue = EditorGUI.Foldout(foldoutRect, editorFoldout.boolValue, "Buttons", true);
+        if (editorFoldout.boolValue)
+        {
+            i++;
+            attr = (MethodButtonAttribute)base.attribute;
+            foreach (var name in attr.MethodNames)
+            {
+                i++;
+                Rect buttonRect = new Rect(position.x, position.y + (buttonHeight * i), position.width, buttonHeight);
+                if (GUI.Button(buttonRect, name))
+                {
+                    InvokeMethod(editorFoldout, name);
+                }
+            }
+        }
+    }
+
+    public override float GetPropertyHeight(SerializedProperty property, GUIContent label)
+    {
+        return EditorGUI.GetPropertyHeight(property, label, true) + buttonHeight * i + 2;
+    }
+
+    private void InvokeMethod(SerializedProperty property, string name)
+    {
+        Object target = property.serializedObject.targetObject;
+        target.GetType().GetMethod(name).Invoke(target, null);  
+    }
+
+    private void LogErrorMessage(SerializedProperty editorFoldout)
+    {
+        Debug.LogError("<color=red><b>Possible improper usage of method button attribute!</b></color>");
+#if NET_4_6
+        Debug.LogError($"Got field name: <b>{editorFoldout.name}</b>, Expected: <b>editorFoldout</b>");
+        Debug.LogError($"Please see <b>{"Usage"}</b> at <b><i><color=blue>{"https://github/address"}</color></i></b>");
+#else
+        Debug.LogError(string.Format("Got field name: <b>{0}</b>, Expected: <b>editorFoldout</b>", editorFoldout.name));
+        Debug.LogError("Please see <b>\"Usage\"</b> at <b><i><color=blue>\"https://github/address\"</color></i></b>");
+#endif
+    }
+}