Create a PropertyDrawer context menu

Is it possible to create a right-click menu on a specifc propertyDrawer? Just like when you right click on an element in a list or an array.
(I noticed that when using my custom propertyDrawer, the array's context menu no longer work, so I assume this menu is actually a part of the propertyDrawer ?)

I found a lot of doc on how adding entries to various existing menu, but nothing about specifc properties.

 

Sure. Check for a MouseDown event with a button of 1, make sure the mouse position is inside the property rect, then create a

GenericMenu

and call

ShowAsContext

on it.

 

@Madgvox Thanks a lot for the directions !
If it can help anyone else, this is what the code would look like :

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4. using UnityEditor;
5.  
6. public class CustomDrawer : PropertyDrawer {
7.     // Methods that will be called by the Context menu
8.     SerializedProperty activeProperty;
9.     void Expand     () { activeProperty.isExpanded = true;  }
10.     void Unexpand() { activeProperty.isExpanded = false; }
11.  
12.  
13.     public override void OnGUI (Rect position, SerializedProperty property, GUIContent label) {
14.         Event e = Event.current;
15.      
16.         if (e.type == EventType.MouseDown && e.button == 1 && position.Contains(e.mousePosition)) {
17.          
18.             activeProperty = property;
19.             GenericMenu context = new GenericMenu ();
20.          
21.             context.AddItem (new GUIContent ("Expand"),    property.isExpanded, Expand);
22.             context.AddItem (new GUIContent ("Unexpand"), !property.isExpanded, Unexpand);
23.          
24.             context.ShowAsContext ();
25.         }
26.  
27.         /*...
28.         Actually draw the property
29.         ... */
30.          
31.     }//
32.  
33.  
34. } // END Drawer
35.  

I noticed a small oddity though.
If I use the context menu to change the SerializedProperty actual value, everything works perfectly. However, if a menu entry does nothing but changing the value of

property.isExpanded

, (like the code above), the inspector will actuall struggle to reflect these changes : sometimes it will take a small second to update, sometimes it won't update until I interact with it again, sometimes it flashes between 'expanded' and 'not expanded' for a moment before stabilizing... It can get even funkier when fiddling with more than one property in the inspector.
I tried several tricks to try and force the inspector to repaint immediatly, but no luck.
Any idea what's causing this ?

 

You have to call property.serializedObject.Update() before changing property and call property.serializedObject.ApplyModifiedProperties() after.

 

Not for property drawers. That logic wraps the inspector GUI on a custom editor. If you put it in a property drawer it would at best do nothing and at worst cause state issues.

You might try using

EditorGUI.BeginProperty

and

EditorGUI.EndProperty

, but I wouldn't be surprised if that doesn't work since the callback for the context menu is not synchronous with the GUI method.

 

When you put it like that it seems bloody obvious that that'd be the case. I don't know why that didn't occur to me!

 

https://docs.unity3d.com/ScriptReference/EditorApplication-contextualPropertyMenu.html