128 lines
4.4 KiB
C#
128 lines
4.4 KiB
C#
#if UNITY_2019_3_OR_NEWER
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using System;
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using System.Linq;
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using System.Collections.Generic;
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using UnityEngine;
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using UnityEditor;
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using UnityEditor.IMGUI.Controls;
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namespace MackySoft.SerializeReferenceExtensions.Editor {
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[CustomPropertyDrawer(typeof(SubclassSelectorAttribute))]
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public class SubclassSelectorDrawer : PropertyDrawer {
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struct TypePopupCache {
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public AdvancedTypePopup TypePopup { get; }
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public AdvancedDropdownState State { get; }
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public TypePopupCache (AdvancedTypePopup typePopup,AdvancedDropdownState state) {
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TypePopup = typePopup;
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State = state;
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}
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}
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const int k_MaxTypePopupLineCount = 13;
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static readonly Type k_UnityObjectType = typeof(UnityEngine.Object);
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static readonly GUIContent k_NullDisplayName = new GUIContent(TypeMenuUtility.k_NullDisplayName);
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static readonly GUIContent k_IsNotManagedReferenceLabel = new GUIContent("The property type is not manage reference.");
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readonly Dictionary<string,TypePopupCache> m_TypePopups = new Dictionary<string,TypePopupCache>();
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readonly Dictionary<string,GUIContent> m_TypeNameCaches = new Dictionary<string,GUIContent>();
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SerializedProperty m_TargetProperty;
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public override void OnGUI (Rect position,SerializedProperty property,GUIContent label) {
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EditorGUI.BeginProperty(position,label,property);
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if (property.propertyType == SerializedPropertyType.ManagedReference) {
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// Draw the subclass selector popup.
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Rect popupPosition = new Rect(position);
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popupPosition.width -= EditorGUIUtility.labelWidth;
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popupPosition.x += EditorGUIUtility.labelWidth;
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popupPosition.height = EditorGUIUtility.singleLineHeight;
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if (EditorGUI.DropdownButton(popupPosition,GetTypeName(property),FocusType.Keyboard)) {
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TypePopupCache popup = GetTypePopup(property);
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m_TargetProperty = property;
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popup.TypePopup.Show(popupPosition);
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}
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// Draw the managed reference property.
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EditorGUI.PropertyField(position,property,label,true);
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} else {
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EditorGUI.LabelField(position,label,k_IsNotManagedReferenceLabel);
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}
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EditorGUI.EndProperty();
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}
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TypePopupCache GetTypePopup (SerializedProperty property) {
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// Cache this string. This property internally call Assembly.GetName, which result in a large allocation.
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string managedReferenceFieldTypename = property.managedReferenceFieldTypename;
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if (!m_TypePopups.TryGetValue(managedReferenceFieldTypename,out TypePopupCache result)) {
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var state = new AdvancedDropdownState();
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Type baseType = ManagedReferenceUtility.GetType(managedReferenceFieldTypename);
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var popup = new AdvancedTypePopup(
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TypeCache.GetTypesDerivedFrom(baseType).Where(p =>
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(p.IsPublic || p.IsNestedPublic) &&
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!p.IsAbstract &&
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!p.IsGenericType &&
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!k_UnityObjectType.IsAssignableFrom(p) &&
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Attribute.IsDefined(p,typeof(SerializableAttribute))
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),
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k_MaxTypePopupLineCount,
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state
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);
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popup.OnItemSelected += item => {
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Type type = item.Type;
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object obj = m_TargetProperty.SetManagedReference(type);
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m_TargetProperty.isExpanded = (obj != null);
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m_TargetProperty.serializedObject.ApplyModifiedProperties();
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m_TargetProperty.serializedObject.Update();
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};
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result = new TypePopupCache(popup, state);
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m_TypePopups.Add(managedReferenceFieldTypename, result);
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}
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return result;
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}
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GUIContent GetTypeName (SerializedProperty property) {
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// Cache this string.
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string managedReferenceFullTypename = property.managedReferenceFullTypename;
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if (string.IsNullOrEmpty(managedReferenceFullTypename)) {
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return k_NullDisplayName;
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}
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if (m_TypeNameCaches.TryGetValue(managedReferenceFullTypename,out GUIContent cachedTypeName)) {
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return cachedTypeName;
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}
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Type type = ManagedReferenceUtility.GetType(managedReferenceFullTypename);
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string typeName = null;
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AddTypeMenuAttribute typeMenu = TypeMenuUtility.GetAttribute(type);
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if (typeMenu != null) {
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typeName = typeMenu.GetTypeNameWithoutPath();
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if (!string.IsNullOrWhiteSpace(typeName)) {
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typeName = ObjectNames.NicifyVariableName(typeName);
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}
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}
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if (string.IsNullOrWhiteSpace(typeName)) {
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typeName = ObjectNames.NicifyVariableName(type.Name);
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}
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GUIContent result = new GUIContent(typeName);
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m_TypeNameCaches.Add(managedReferenceFullTypename,result);
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return result;
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}
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public override float GetPropertyHeight (SerializedProperty property,GUIContent label) {
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return EditorGUI.GetPropertyHeight(property,true);
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}
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}
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}
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#endif |