static IEnumerable <Type> GetConstructableTypes(Type type)
{
if (TypeConstruction.CanBeConstructed(type))
{
yield return(type);
}
foreach (var t in UnityEditor.TypeCache.GetTypesDerivedFrom(type).Where(TypeConstruction.CanBeConstructed))
{
yield return(t);
}
}
static IEnumerable <Type> GetConstructableTypes <TType>()
{
if (TypeConstruction.CanBeConstructed <TType>())
{
yield return(typeof(TType));
}
foreach (var type in UnityEditor.TypeCache.GetTypesDerivedFrom <TType>().Where(TypeConstruction.CanBeConstructed))
{
yield return(type);
}
}
static void RegisterInspectorType(Dictionary <Type, List <Type> > typeMap, Type interfaceType, Type inspectorType)
{
var inspectorInterface = inspectorType.GetInterface(interfaceType.FullName);
if (null == inspectorInterface || inspectorType.IsAbstract || inspectorType.ContainsGenericParameters)
{
return;
}
var genericArguments = inspectorInterface.GetGenericArguments();
var componentType = genericArguments[0];
if (!TypeConstruction.HasParameterLessConstructor(inspectorType))
{
Debug.LogError($"Could not create a custom inspector for type `{inspectorType.Name}`: no default or empty constructor found.");
}
if (!typeMap.TryGetValue(componentType, out var list))
{
typeMap[componentType] = list = new List <Type>();
}
list.Add(inspectorType);
}
public NullElement(string name)
{
styleSheets.Add(AssetDatabase.LoadAssetAtPath <StyleSheet>("Packages/com.unity.properties/Editor Default Resources/uss/null-element.uss"));
AddToClassList("unity-properties-null");
var label = new Label(name);
label.AddToClassList("unity-properties-null--label");
Add(label);
var constructibleTypes = TypeConstruction.GetAllConstructibleTypes <TType>();
if (constructibleTypes.Count > 0)
{
var button = new Button()
{
text = "New Instance",
bindingPath = name
};
// Multiple choices are available
if (constructibleTypes.Count > 1)
{
button.clickable.clicked += () =>
{
var menu = new GenericMenu();
foreach (var type in TypeConstruction.GetAllConstructibleTypes <TType>())
{
var t = type;
menu.AddItem(new GUIContent(t.Name), false, () =>
{
var newValue = TypeConstruction.Construct <TType>(type);
var binding = GetFirstAncestorOfType <PropertyElement>();
binding.SetValue(button, newValue);
binding.Refresh(true);
});
}
menu.DropDown(button.worldBound);
};
}
else
{
button.clickable.clicked += () =>
{
var type = constructibleTypes[0];
var newValue = type == typeof(TType)
? TypeConstruction.Construct <TType>()
: TypeConstruction.Construct <TType>(type);
var binding = GetFirstAncestorOfType <PropertyElement>();
binding.SetValue(button, newValue);
binding.Refresh(true);
};
}
button.AddToClassList("unity-properties-null--button");
Add(button);
}
else
{
var value = new Label("Cannot create new Instance");
value.AddToClassList("unity-properties-null--value");
Add(value);
}
}