86 lines
2.4 KiB
C#
86 lines
2.4 KiB
C#
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using CommunityToolkit.Mvvm.ComponentModel;
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Linq.Expressions;
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using System.Runtime.CompilerServices;
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using System.Text;
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using System.Threading.Tasks;
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namespace Cowain.Base.UndoRedo;
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[Flags]
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public enum PropertyFlags
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{
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Disable = 0,
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Enable = 1
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}
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public abstract class Undoable : ObservableObject
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{
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private readonly HashSet<string> _trackedProperties = new HashSet<string>();
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public IActionsHistory History { get; }
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private void RecordHistory<TPropType>(string propName, TPropType previous, TPropType current)
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{
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if (_trackedProperties.Contains(propName))
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{
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var prop = PropertyCache.Get(GetType(), propName);
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History.Record(() => prop.SetValue(this, current), () => prop.SetValue(this, previous), propName);
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}
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}
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protected void RecordProperty(string propName, PropertyFlags flags = PropertyFlags.Enable)
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{
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if (flags == PropertyFlags.Disable)
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{
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_trackedProperties.Remove(propName);
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}
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else if (flags.HasFlag(PropertyFlags.Enable))
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{
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_trackedProperties.Add(propName);
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}
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}
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protected void RecordProperty<TType>(Expression<Func<TType, object?>> selector, PropertyFlags flags = PropertyFlags.Enable)
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{
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if (!RuntimeFeature.IsDynamicCodeSupported)
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return;
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string name = GetPropertyName(selector);
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RecordProperty(name, flags);
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}
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private static string GetPropertyName(Expression memberAccess)
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=> memberAccess switch
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{
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LambdaExpression lambda => GetPropertyName(lambda.Body),
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MemberExpression mbr => mbr.Member.Name,
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UnaryExpression unary => GetPropertyName(unary.Operand),
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_ => throw new Exception($"Member name could not be extracted from {memberAccess}.")
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};
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//protected override bool SetProperty<TPropType>(ref TPropType field, TPropType value, [CallerMemberName] string propertyName = "")
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//{
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// TPropType prev = field;
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// if (base.SetProperty(ref field, value, propertyName))
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// {
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// RecordHistory(propertyName, prev, value);
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// return true;
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// }
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// return false;
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//}
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public Undoable()
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{
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History = ActionsHistory.Global;
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}
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public Undoable(IActionsHistory history)
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{
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History = history;
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}
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}
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