67 lines
2.1 KiB
C#
67 lines
2.1 KiB
C#
using System;
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using System.Linq;
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using System.Windows;
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using System.Windows.Input;
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using UIShare.PubEvent;
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using MainModule.ViewModels;
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using UIShare.ViewModelBase;
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namespace MainModule.ViewModels
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{
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public class MainViewModel : NavigateViewModelBase, IRegionMemberLifetime
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{
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#region 私有字段
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private bool IsInitialized = false;
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private string _expandedCellName = string.Empty;
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#endregion
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#region 属性
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public bool KeepAlive => true; // 保持存活
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public string ExpandedCellName
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{
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get => _expandedCellName;
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set => SetProperty(ref _expandedCellName, value);
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}
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#endregion
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#region 命令
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public ICommand LoadedCommand { get; set; }
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#endregion
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public MainViewModel(IContainerProvider containerProvider) : base(containerProvider)
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{
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LoadedCommand = new DelegateCommand(OnLoaded);
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_eventAggregator.GetEvent<ExpandViewEvent>().Subscribe(OnCellExpandRequested);
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}
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#region 命令处理与事件
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private void OnLoaded()
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{
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if (IsInitialized) return;
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for (int i = 1; i <= 9; i++)
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{
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var parameters = new NavigationParameters { { "Name", $"TestCell{i}" } };
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_regionManager.RequestNavigate($"TestCell{i}", "ProtocolStartView", parameters);
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}
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IsInitialized = true;
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}
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// 不再物理搬迁视图，只需修改一个字符串属性 ExpandedCellName，
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// XAML 里每个单元的 Style.Triggers 会根据该值处理隐藏 / 跨越 3x3。
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private void OnCellExpandRequested(string cellName)
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{
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ExpandedCellName = cellName ?? string.Empty;
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}
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#endregion
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#region 重写
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public override bool IsNavigationTarget(NavigationContext navigationContext)
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{
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// 之前帮你改好的单例复用逻辑（防止重复 new 和初始化视图）
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return true;
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}
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#endregion
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}
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} |