54 lines
1.9 KiB
C#
54 lines
1.9 KiB
C#
using Avalonia.Controls;
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using Avalonia.Controls.Templates;
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using Avalonia_PC.ViewModels;
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using System;
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using System.Diagnostics.CodeAnalysis;
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namespace Avalonia_PC
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{
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/// <summary>
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/// Given a view model, returns the corresponding view if possible.
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/// </summary>
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[RequiresUnreferencedCode(
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"Default implementation of ViewLocator involves reflection which may be trimmed away.",
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Url = "https://docs.avaloniaui.net/docs/concepts/view-locator")]
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/// <summary>
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/// 视图定位器，根据 ViewModel 类型自动查找对应的 View，
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/// 实现 IDataTemplate 以支持 Avalonia 的数据模板机制。
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/// </summary>
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public class ViewLocator : IDataTemplate
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{
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/// <summary>
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/// 根据 ViewModel 实例构建对应的 View 控件。
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/// 约定：将 ViewModels 命名空间中的 ViewModel 替换为 Views 命名空间中的同名 View。
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/// </summary>
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/// <param name="param">ViewModel 实例。</param>
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/// <returns>对应的 View 控件；若未找到则返回 TextBlock 显示错误信息。</returns>
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public Control? Build(object? param)
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{
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if (param is null)
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return null;
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var name = param.GetType().FullName!.Replace("ViewModel", "View", StringComparison.Ordinal);
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var type = Type.GetType(name);
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if (type != null)
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{
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return (Control)Activator.CreateInstance(type)!;
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}
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return new TextBlock { Text = "Not Found: " + name };
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}
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/// <summary>
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/// 判断数据对象是否为 ViewModel 类型（以 "ViewModel" 结尾）。
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/// </summary>
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/// <param name="data">要判断的数据对象。</param>
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/// <returns>是否为 ViewModel。</returns>
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public bool Match(object? data)
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{
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return data is ViewModelBase;
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}
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}
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}
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