113 lines
3.1 KiB
C#
113 lines
3.1 KiB
C#
using System;
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using System.Windows.Controls;
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using GalaSoft.MvvmLight.CommandWpf;
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using GalaSoft.MvvmLight.Messaging;
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using HandyControlDemo.Data;
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using HandyControlDemo.Service;
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using HandyControlDemo.Tools;
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namespace HandyControlDemo.ViewModel
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{
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public class MainViewModel : DemoViewModelBase<DemoDataModel>
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{
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#region 字段
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/// <summary>
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/// 内容标题
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/// </summary>
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private object _contentTitle;
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/// <summary>
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/// 子内容
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/// </summary>
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private object _subContent;
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/// <summary>
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/// 当前选中的列表项
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/// </summary>
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private ListBoxItem _listBoxItemCurrent;
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#endregion
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public MainViewModel(DataService dataService)
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{
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Messenger.Default.Register<object>(this, MessageToken.LoadShowContent, obj =>
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{
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if (SubContent is IDisposable disposable)
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{
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disposable.Dispose();
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}
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SubContent = obj;
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});
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Messenger.Default.Register<object>(this, MessageToken.ClearLeftSelected, obj =>
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{
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if (_listBoxItemCurrent == null) return;
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_listBoxItemCurrent.IsSelected = false;
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_listBoxItemCurrent = null;
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});
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DataList = dataService.GetDemoDataList();
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}
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#region 属性
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/// <summary>
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/// 子内容
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/// </summary>
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public object SubContent
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{
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get => _subContent;
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set => Set(ref _subContent, value);
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}
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/// <summary>
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/// 内容标题
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/// </summary>
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public object ContentTitle
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{
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get => _contentTitle;
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set => Set(ref _contentTitle, value);
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}
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#endregion
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#region 命令
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/// <summary>
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/// 切换例子命令
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/// </summary>
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public RelayCommand<SelectionChangedEventArgs> SwitchDemoCmd =>
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new Lazy<RelayCommand<SelectionChangedEventArgs>>(() =>
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new RelayCommand<SelectionChangedEventArgs>(SwitchDemo)).Value;
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#endregion
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#region 方法
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/// <summary>
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/// 切换例子
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/// </summary>
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private void SwitchDemo(SelectionChangedEventArgs e)
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{
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if (e.AddedItems.Count == 0) return;
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if (e.AddedItems[0] is ListBoxItem item)
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{
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if (item.Tag is string tag)
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{
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if (Equals(_listBoxItemCurrent, item)) return;
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_listBoxItemCurrent = item;
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ContentTitle = item.Content;
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Messenger.Default.Send(false, MessageToken.FullSwitch);
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Messenger.Default.Send(AssemblyHelper.CreateInternalInstance($"UserControl.{tag}"), MessageToken.LoadShowContent);
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}
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else
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{
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_listBoxItemCurrent = null;
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ContentTitle = null;
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SubContent = null;
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}
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}
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}
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#endregion
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}
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} |