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37 lines
1.1 KiB
C#
37 lines
1.1 KiB
C#
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
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// See the LICENCE file in the repository root for full licence text.
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namespace osu.Game.Screens.Edit.Commands
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{
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public abstract class PropertyChangeCommand<TTarget, TProperty> : IEditorCommand, IMergeableCommand where TTarget : class
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{
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protected abstract TProperty ReadValue(TTarget target);
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protected abstract void WriteValue(TTarget target, TProperty value);
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protected abstract PropertyChangeCommand<TTarget, TProperty> CreateInstance(TTarget target, TProperty value);
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public readonly TTarget Target;
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public readonly TProperty Value;
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protected PropertyChangeCommand(TTarget target, TProperty value)
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{
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Target = target;
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Value = value;
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}
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public void Apply() => WriteValue(Target, Value);
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public IEditorCommand CreateUndo() => CreateInstance(Target, Value);
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public IEditorCommand? MergeWith(IEditorCommand previous)
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{
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if (previous is PropertyChangeCommand<TTarget, TProperty> command && command.Target == Target)
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return this;
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return null;
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}
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}
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}
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