New AddButton() and RemoveButton() room methods

Use AddButton() to make any sprite clickable
Use RemoveButton() to remove clickable functionality

Assets/Fungus/Scripts/Button.cs

@@ -1,4 +1,5 @@
 using UnityEngine;
+using System;
 using System.Collections;
 using Fungus;
 
@@ -10,25 +11,34 @@ namespace Fungus
 	[RequireComponent (typeof (BoxCollider2D))]
 	public class Button : MonoBehaviour 
 	{
-		public string methodName;
+		public Action buttonAction;
-
 		public SpriteRenderer spriteRenderer;
 
-		public bool autoDisable = false;
+		// Makes a sprite into a clickable button
-
+		public static void MakeButton(SpriteRenderer _spriteRenderer, Action _buttonAction)
-		void Start()
 		{
-			spriteRenderer = GetComponent<SpriteRenderer>();
+			if (_spriteRenderer == null)
+			{
+				Debug.LogError("Sprite renderer must not be null");
+				return;
 			}
 
-		void OnMouseUpAsButton() 
+			// Remove any previous button component that was added
-		{
+			Button oldButton = _spriteRenderer.gameObject.GetComponent<Button>();
-			if (methodName == "")
+			if (oldButton != null)
 			{
-				return;
+				Destroy(oldButton);
 			}
 
-			// Ignore button press if button is not fully visible
+			// This will automatically add a BoxCollider2d if none currently exists
+			Button button = _spriteRenderer.gameObject.AddComponent<Button>();
+			button.buttonAction = _buttonAction;
+			button.spriteRenderer = _spriteRenderer;
+		}
+
+		void OnMouseUpAsButton() 
+		{
+			// Ignore button press if sprite is not fully visible
 			if (spriteRenderer.color.a != 1f)
 			{
 				return;
@@ -40,12 +50,7 @@ namespace Fungus
 				return;
 			}
 
-			room.ExecuteCommandMethod(methodName);
+			room.ExecuteCommandMethod(buttonAction);
-
-			if (autoDisable)
-			{
-				gameObject.SetActive(false);
-			}
 		}
 	}
 }

Assets/Fungus/Scripts/Commands.cs

@@ -351,7 +351,7 @@ namespace Fungus
 		}		
 	}
 
-	// Sets an animator trigger to change the animation state for an animated sprite
+	// Sets an animator trigger to change the animator state for an animated sprite
 	public class SetAnimatorTriggerCommand : CommandQueue.Command
 	{
 		Animator animator;
@@ -381,6 +381,64 @@ namespace Fungus
 		}		
 	}
 
+	// Makes a sprite behave as a clickable button
+	public class AddButtonCommand : CommandQueue.Command
+	{
+		SpriteRenderer spriteRenderer;
+		Action buttonAction;
+		
+		public AddButtonCommand(SpriteRenderer _spriteRenderer,
+		                        Action _buttonAction)
+		{
+			if (_spriteRenderer == null)
+			{
+				Debug.LogError("Sprite renderer must not be null.");
+				return;
+			}
+			
+			spriteRenderer = _spriteRenderer;
+			buttonAction = _buttonAction;
+		}
+		
+		public override void Execute(CommandQueue commandQueue, Action onComplete)
+		{
+			Button.MakeButton(spriteRenderer, buttonAction);
+			
+			if (onComplete != null)
+			{
+				onComplete();
+			}
+		}		
+	}
+
+	// Makes a sprite stop behaving as a clickable button
+	public class RemoveButtonCommand : CommandQueue.Command
+	{
+		SpriteRenderer spriteRenderer;
+
+		public RemoveButtonCommand(SpriteRenderer _spriteRenderer)
+		{
+			if (_spriteRenderer == null)
+			{
+				Debug.LogError("Sprite renderer must not be null.");
+				return;
+			}
+			
+			spriteRenderer = _spriteRenderer;
+		}
+		
+		public override void Execute(CommandQueue commandQueue, Action onComplete)
+		{
+			Button button = spriteRenderer.gameObject.GetComponent<Button>();
+			GameObject.Destroy(button);
+
+			if (onComplete != null)
+			{
+				onComplete();
+			}
+		}		
+	}
+
 	// Pans the camera to a view over a period of time.
 	public class PanToViewCommand : CommandQueue.Command
 	{

Assets/Fungus/Scripts/Room.cs

@@ -323,6 +323,18 @@ namespace Fungus
 			commandQueue.AddCommand(new FadeSpriteCommand(spriteRenderer, color, duration, slideOffset));
 		}
 
+		// Makes a sprite behave as a clickable button
+		public void AddButton(SpriteRenderer buttonSprite, Action buttonAction)
+		{
+			commandQueue.AddCommand(new AddButtonCommand(buttonSprite, buttonAction));
+		}
+
+		// Makes a sprite stop behaving as a clickable button
+		public void RemoveButton(SpriteRenderer buttonSprite)
+		{
+			commandQueue.AddCommand(new RemoveButtonCommand(buttonSprite));
+		}
+
 		// Sets an animator trigger to change the animation state for an animated sprite
 		public void SetAnimatorTrigger(Animator animator, string triggerName)
 		{

Assets/FungusExample/Scripts/SpritesRoom.cs

@@ -12,7 +12,6 @@ public class SpritesRoom : Room
 	void OnEnter() 
 	{	
 		HideSprite(redMushroomSprite);
-		FadeSprite(redMushroomSprite, 1f, 2f);
 
 		ShowSprite(blueAlienSprite);
 
@@ -24,15 +23,24 @@ public class SpritesRoom : Room
 		Say("Blue Alien starts to dance.");
 		Say("Tap on Blue Alien to stop him dancing.");
 
-		FadeSprite(redMushroomSprite, 0f, 2f);
+		AddButton(blueAlienSprite, StopDancing);
 	}	
 
 	// This method is called from the Button component on the BlueAlien object
 	void StopDancing()
 	{
+		RemoveButton(blueAlienSprite);
+
 		SetAnimatorTrigger(blueAlienAnim, "Stop");
 
 		Say("Nice moves there Blue Alien!");
+
+		Say("Maybe you want a nice mushroom to sit down on?");
+		FadeSprite(redMushroomSprite, 1f, 1f);
+
+		Say("Don't want to sit? Ok, no problem.");
+		FadeSprite(redMushroomSprite, 0f, 1f);
+
 		Say("Uh oh, you look like you're turning a little green after all that dancing!");
 
 		SetAnimatorTrigger(blueAlienAnim, "StartGreenWalk");