void ShowInline(Rect position, SerializedProperty property, GUIContent label, ReferenceTypeSelectorAttribute typeSelector, object targetObject)
{
var labalPosition = new Rect(position.x, position.y, EditorGUIUtility.labelWidth, position.height);
var buttonPosition = new Rect(position.x + EditorGUIUtility.labelWidth + 2, position.y, position.width - EditorGUIUtility.labelWidth - 2, position.height);
EditorGUI.LabelField(labalPosition, label);
ShowInstanceMenu(buttonPosition, property, typeSelector, targetObject);
}
void ShowFoldout(Rect position, SerializedProperty property, GUIContent label, ReferenceTypeSelectorAttribute typeSelector, object targetObject)
{
EditorGUI.PropertyField(position, property, label, true);
if (property.isExpanded)
{
var buttonPosition = new Rect(position.x, position.y + position.height - EditorGUIUtility.singleLineHeight, position.width, EditorGUIUtility.singleLineHeight);
using (new EditorGUI.IndentLevelScope(1)) {
buttonPosition = EditorGUI.IndentedRect(buttonPosition);
ShowInstanceMenu(buttonPosition, property, typeSelector, targetObject);
}
}
}
void ShowInstanceMenu(Rect position, SerializedProperty property, ReferenceTypeSelectorAttribute typeSelector, object targetObject)
{
var baseType = typeSelector.baseType;
var buttonText = (targetObject == null) ? "null" : targetObject.GetType().Name;
if (GUI.Button(position, buttonText))
{
var context = new GenericMenu();
context.AddItem(new GUIContent("Set null"), false, () => {
property.managedReferenceValue = null;
property.serializedObject.ApplyModifiedProperties();
});
if (typeSelector.isAbstractBase)
{
context.AddDisabledItem(new GUIContent(baseType.Name));
}
else
{
context.AddItem(new GUIContent(baseType.Name), false, () => {
property.managedReferenceValue = Activator.CreateInstance(baseType);
property.serializedObject.ApplyModifiedProperties();
});
}
context.AddSeparator("");
foreach (var subType in typeSelector.subTypes)
{
context.AddItem(new GUIContent(subType.Name), false, () => {
property.managedReferenceValue = Activator.CreateInstance(subType);
property.serializedObject.ApplyModifiedProperties();
});
}
var pos = new Rect(position.x, position.y + EditorGUIUtility.singleLineHeight, 0, 0);
context.DropDown(pos);
}
}
