Merge pull request #669 from stevehalliwell/BlockReferenceDrawer

Added BlockReference, a simple data type with a property drawer that …

Assets/Fungus/Scripts/Editor/BlockReferenceDrawer.cs

@@ -0,0 +1,53 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEditor;
+
+namespace Fungus.EditorUtils
+{
+    /// <summary>
+    /// Custom drawer for the BlockReference, allows for more easily selecting a target block in external c#
+    /// scripts.
+    /// </summary>
+    [CustomPropertyDrawer(typeof(Fungus.BlockReference))]
+    public class BlockReferenceDrawer : PropertyDrawer
+    {
+        public Fungus.Flowchart lastFlowchart;
+
+        public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
+        {
+            var l = EditorGUI.BeginProperty(position, label, property);
+            position = EditorGUI.PrefixLabel(position, l);
+            position.height = EditorGUIUtility.singleLineHeight;
+            var block = property.FindPropertyRelative("block");
+
+            Fungus.Block b = block.objectReferenceValue as Fungus.Block;
+
+            if (block.objectReferenceValue != null && lastFlowchart == null)
+            {
+                if (b != null)
+                {
+                    lastFlowchart = b.GetFlowchart();
+                }
+            }
+
+            lastFlowchart = EditorGUI.ObjectField(position, lastFlowchart, typeof(Fungus.Flowchart), true) as Fungus.Flowchart;
+            position.y += EditorGUIUtility.singleLineHeight;
+            if (lastFlowchart != null)
+                b = Fungus.EditorUtils.BlockEditor.BlockField(position, new GUIContent("None"), lastFlowchart, b);
+            else
+                EditorGUI.PrefixLabel(position, new GUIContent("Flowchart Required"));
+
+            block.objectReferenceValue = b;
+
+            block.serializedObject.ApplyModifiedProperties();
+            property.serializedObject.ApplyModifiedProperties();
+            EditorGUI.EndProperty();
+        }
+
+        public override float GetPropertyHeight(SerializedProperty property, GUIContent label)
+        {
+            return EditorGUIUtility.singleLineHeight * 2;
+        }
+    }
+}

Assets/Fungus/Scripts/Utils/BlockReference.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace Fungus
+{
+    /// <summary>
+    /// A simple struct wrapping a reference to a Fungus Block. Allows for BlockReferenceDrawer. 
+    /// This is the recommended way to directly reference a fungus block in external c# scripts,
+    /// as it will give you an inspector field that gives a drop down of all the blocks on a 
+    /// flowchart, in a similar way to what you would expect from selecting a block on a command.
+    /// </summary>
+    [System.Serializable]
+    public struct BlockReference
+    {
+        public Block block;
+
+        public void Execute()
+        {
+            if (block != null)
+                block.StartExecution();
+        }
+    }
+}