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106 lines
3.7 KiB
C#
106 lines
3.7 KiB
C#
// Animancer // Copyright 2020 Kybernetik //
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#if UNITY_EDITOR
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#pragma warning disable CS0169 // Field is never used.
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using UnityEditor;
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using UnityEngine;
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using UnityEngine.Events;
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namespace Animancer.Editor
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{
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/// <summary>
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/// An object that holds a serialized callback (a <see cref="UnityEvent"/> by default) so that empty ones can be
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/// drawn in the GUI without allocating array space for them until they actually contain something.
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/// </summary>
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internal sealed class DummySerializableCallback : ScriptableObject
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{
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/************************************************************************************************************************/
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[SerializeField] private SerializableCallbackHolder _Holder;
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/************************************************************************************************************************/
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private static SerializedProperty _CallbackProperty;
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private static SerializedProperty CallbackProperty
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{
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get
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{
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if (_CallbackProperty == null)
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{
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var instance = CreateInstance<DummySerializableCallback>();
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instance.hideFlags = HideFlags.HideInHierarchy | HideFlags.DontSave;
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var serializedObject = new SerializedObject(instance);
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_CallbackProperty = serializedObject.FindProperty("_Holder._Callback");
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AssemblyReloadEvents.beforeAssemblyReload += () =>
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{
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serializedObject.Dispose();
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DestroyImmediate(instance);
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};
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}
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return _CallbackProperty;
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}
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}
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/************************************************************************************************************************/
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public static float Height
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{
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get
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{
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return EditorGUI.GetPropertyHeight(CallbackProperty);
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}
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}
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/************************************************************************************************************************/
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public static bool DoCallbackGUI(ref Rect area, GUIContent label, SerializedProperty property,
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out object callback)
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{
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var callbackProperty = CallbackProperty;
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callbackProperty.serializedObject.Update();
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callbackProperty.prefabOverride = property.prefabOverride;
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area.height = Height;
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EditorGUI.BeginChangeCheck();
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label = EditorGUI.BeginProperty(area, label, property);
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// UnityEvents ignore the proper indentation which makes them look terrible in a list.
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// So we force the area to be indented.
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var indentedArea = EditorGUI.IndentedRect(area);
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var indentLevel = EditorGUI.indentLevel;
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EditorGUI.indentLevel = 0;
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EditorGUI.PropertyField(indentedArea, callbackProperty, label, false);
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EditorGUI.indentLevel = indentLevel;
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EditorGUI.EndProperty();
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if (EditorGUI.EndChangeCheck())
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{
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callbackProperty.serializedObject.ApplyModifiedProperties();
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callback = callbackProperty.GetValue();
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callbackProperty.SetValue(null);
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callbackProperty.serializedObject.Update();
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if (AnimancerEvent.Sequence.Serializable.HasPersistentCalls(callback))
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return true;
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}
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callback = null;
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return false;
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}
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/************************************************************************************************************************/
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}
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}
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#endif
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