66 lines
2.1 KiB
C#
66 lines
2.1 KiB
C#
using System;
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namespace StgSharp.UserInterface.Sample
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{
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public sealed class PanelStateSample : PanelState
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{
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public const string SampleStatePath = nameof(PanelStateSample) + "." + nameof(SampleState);
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private int sampleState;
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public PanelStateSample()
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: base(nameof(PanelStateSample))
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{
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}
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public int SampleState => sampleState;
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// 生成器拆分后，这里相当于某个节点 handler 的 guard，
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// 对应 ICommand 语义中的 CanExecute。
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private static bool CanApplySampleStateChange(
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int origin,
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int current,
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StateValueCommand<int> command
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)
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{
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return string.Equals(command.StatePath, SampleStatePath, StringComparison.Ordinal)
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&& current >= 0
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&& origin != current;
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}
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// 实际项目里这整个 StateChangeHandler 都由源生成器产出；
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// 这里手写展开，只是为了展示“没有生成器时 VSS 代码长什么样”。
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public void ApplySampleStateChangeCommand(
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StateValueCommand<int> command
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)
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{
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ArgumentNullException.ThrowIfNull(command);
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int origin = sampleState;
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int current = command.Value;
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if (!CanApplySampleStateChange(origin, current, command))
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{
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return;
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}
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sampleState = current;
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BroadcastSampleStateChanged(origin, current);
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}
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// 生成器拆分后，这里相当于某个节点写入后的 post-change hook，
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// 对应手写体系里常见的 OnChange 位置。
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private static void BroadcastSampleStateChanged(
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int origin,
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int current
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)
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{
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_ = origin;
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_ = current;
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// event 已禁用。手写版本若还需要状态后置联动，
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// 这里只能继续手写内部同步/广播逻辑；正式版本由生成器织入。
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}
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}
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}
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