koobas.hobune.stream
Editor Scripting: calling a Property Drawer by reference
is there some way that I could call a property Drawer for a class from either a CustomInspector, or from a EditorWindow (essentially another Editor class)?
Context: I have gone through and made some property Drawers for classes, and was wondering if I could just call those PropertyDrawers in some CustomInspectors, so that I can get the same behavior, and appearance.
mostly solved by using the suggestion posted here by @Bunny83 though I have found that because I use List in several places that I need to find a different approach to getting at those.
// in [customInspector(typeof(ClassA))]
ClassA classA;
SerializedObject obj;
SerializedProperty property;
// in OnEnable
classA = (ClassA)target;
obj = new SerializedObject(classA);
// later in OnInspecotGUI
// CustomPropertyDrawer is for field named "data"
property = obj.FindProperty("data");
EditorGUI.PropertyField(GUILayoutUtility.GetRect(
(float)Screen.width, EditorGUI.GetPropertyHeight(property) ),
property);
this uses the CustomePropertyDrawer that was defined for the type "data" is
Well you could use the EditorGUI.PropertyField to have the system draw them for you.
Or you could hack around and retrieve the actual drawer for a given serialized property:
static Func<SerializedProperty, PropertyDrawer> getDrawer;
public static PropertyDrawer GetDrawer(SerializedProperty property)
{
if(getDrawer == null)
{
var mtd = typeof(PropertyDrawer).GetMethod("GetDrawer", BindingFlags.NonPublic | BindingFlags.Static);
getDrawer = (Func<SerializedProperty, PropertyDrawer>)Delegate.CreateDelegate(typeof(Func<SerializedProperty, PropertyDrawer>), null, mtd);
}
return getDrawer(property);
}
could you show the other half of the example (actually calling it),
or how to get from a data value/pointer to a SerializedProperty?
Hey @whydoidoit
First, love your answers -- thanks for all of them! (from one of the lurkers).
Second, this glorious hack doesn't seem to work in Unity 4.5.0f6. I guess GetDrawer() might have been removed from PropertyDrawer? Any chance for an updated version (using your magical Editor insight!) ?
(line 7's $$anonymous$$ethodInfo comes back null.)
Thanks, Rupert.
$$anonymous$$y use-case is wishing to delegate from one PropertyDrawer to another -- easy enough for OnGUI() (simply use PropertyField()) but harder for GetPropertyHeight()! (suggestions that achieve this welcome too!)
Found answer in http://answers.unity3d.com/questions/542669/displaying-a-list-of-propertydrawers-in-a-custom-i.html
One can simply ask EditorGUI.GetPropertyHeight() and it calls the target's PropertyDrawer.GetPropertyHeight() for you :-)
HTH others following this path. Rupert.
@Arkade:
Well, it seems they changed a lot. All the property drawer stuff is now in a seperate internal class called "ScriptAttributeUtility". They implemented a new class called "PropertyHandler" (also internal) which handles the drawing of a SerializedProperty including it's children. The PropertyHandler itself has a methods to deter$$anonymous$$e the correct "Type" for a certain property.
There is now also a DecoratorDrawer and "ScriptAttributeUtility.GetDrawerTypeForType" might return either a PropertyDrawer or a DecoratorDrawer. Inside the PropertyHandler they do this:
public void HandleDrawnType(Type drawnType, Type propertyType, FieldInfo field, PropertyAttribute attribute)
{
Type drawerTypeForType = ScriptAttributeUtility.GetDrawerTypeForType(drawnType);
if (drawerTypeForType != null)
{
if (typeof(PropertyDrawer).IsAssignableFrom(drawerTypeForType))
{
if (propertyType.IsArrayOrList())
{
return;
}
this.m_PropertyDrawer = (PropertyDrawer)Activator.CreateInstance(drawerTypeForType);
this.m_PropertyDrawer.m_FieldInfo = field;
this.m_PropertyDrawer.m_Attribute = attribute;
}
else
{
// [... handle DecoratorDrawer]
}
}
}
It looks like the PropertyDrawers aren't chached seperately anymore. Only the PropertyHanders which contain the PropertyDrawer and an additional list of PropertyDecorators if there are some. If you just want a PropertyDrawer-instance, you might duplicate the above method but you have to use reflection to be able to call ScriptAttributeUtility.GetDrawerTypeForType.
All in all it's getting more and more complicated ;) You might want to download ILSpy and see for yourself.
wow, alright, Got to check that out. also thanks to @Bunny83 for the ILSpy, quite a mess, when the only thing you want to do is trigger the ProperyDrawer^^ but yeah, $$anonymous$$ches me a lot. Although i'm still a bit confused about that entire reflect into internal classes and functions^^ But hey we can't wait for the dev $$anonymous$$m to instantly fulfill our desires^^
