136 lines
4.4 KiB
C#
136 lines
4.4 KiB
C#
using Prism.Commands;
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using Prism.Ioc;
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using System;
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using System.Collections.ObjectModel;
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using System.Windows.Input;
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using UIShare.PubEvent;
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using UIShare.UIViewModel;
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using UIShare.ViewModelBase;
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namespace DeviceEditModule.ViewModels
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{
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/// <summary>
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/// 弹窗管理器 ViewModel。
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/// <para>
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/// 职责：<br/>
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/// 1. 订阅 <see cref="AddDialogTabEvent"/>，将外部弹窗注册为 Tab；<br/>
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/// 2. 维护 <see cref="TagItems"/> 集合，控制选中/关闭逻辑；<br/>
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/// 3. 最小化：通过 <see cref="MinimizeRequested"/> 事件通知 View 执行 P/Invoke 窗口操作；<br/>
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/// 4. 关闭：调用 <see cref="RequestClose"/>。
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/// </para>
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/// </summary>
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public class DialogMangerViewModel : DialogViewModelBase, IDisposable
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{
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#region 属性
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/// <summary>所有 Tab 项集合，绑定到标签条的 ItemsControl。</summary>
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public ObservableCollection<DialogTabItemVM> TagItems { get; } = new();
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private DialogTabItemVM? _selectedTag;
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/// <summary>当前激活的 Tab，其 Content 显示在内容区。</summary>
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public DialogTabItemVM? SelectedTag
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{
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get => _selectedTag;
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set => SetProperty(ref _selectedTag, value);
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}
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/// <summary>是否没有任何 Tab（用于绑定空状态提示的 Visibility）。</summary>
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public bool HasNoTabs => TagItems.Count == 0;
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#endregion
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#region 命令
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public ICommand MinimizeCommand { get; }
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public ICommand CloseCommand { get; }
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#endregion
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#region 事件
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/// <summary>
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/// View 订阅此事件后，在事件回调里执行 P/Invoke 最小化。
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/// 这样 ViewModel 无需引用任何 UI 或 Win32 类型。
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/// </summary>
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public event EventHandler? MinimizeRequested;
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public event EventHandler? RestoreRequested;
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#endregion
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public DialogMangerViewModel(IContainerProvider containerProvider) : base(containerProvider)
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{
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MinimizeCommand = new DelegateCommand(OnMinimize);
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CloseCommand = new DelegateCommand(OnClose);
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// 订阅来自其他模块的"添加 Tab"事件
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_eventAggregator.GetEvent<AddDialogTabEvent>().Subscribe(OnAddTab, ThreadOption.UIThread);
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_eventAggregator.GetEvent<CancelMinimizeEvent>().Subscribe(()=>RestoreRequested.Invoke(this, EventArgs.Empty));
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}
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#region 命令处理
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private void OnMinimize() => MinimizeRequested?.Invoke(this, EventArgs.Empty);
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private void OnClose()
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{
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// 关闭前清空所有 Tab，释放内容引用
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TagItems.Clear();
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SelectedTag = null;
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RequestClose.Invoke();
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}
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#endregion
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#region Tab 管理
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/// <summary>收到事件：创建 Tab 并追加到集合，自动切换选中。</summary>
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private void OnAddTab(DialogTabInfo info)
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{
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var tab = new DialogTabItemVM(OnSelectTab, OnCloseTab)
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{
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Title = info.Title,
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Content = info.Content
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};
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TagItems.Add(tab);
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RaisePropertyChanged(nameof(HasNoTabs));
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ActivateTab(tab);
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}
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/// <summary>激活（选中）指定 Tab，其余全部取消选中。</summary>
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private void OnSelectTab(DialogTabItemVM tab) => ActivateTab(tab);
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/// <summary>关闭指定 Tab，自动选中相邻 Tab（或清空内容区）。</summary>
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private void OnCloseTab(DialogTabItemVM tab)
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{
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int idx = TagItems.IndexOf(tab);
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TagItems.Remove(tab);
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RaisePropertyChanged(nameof(HasNoTabs));
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if (TagItems.Count == 0)
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{
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SelectedTag = null;
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return;
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}
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// 优先选左侧邻 Tab，无左侧则选当前索引（已向左移一位）
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ActivateTab(TagItems[Math.Max(0, idx - 1)]);
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}
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private void ActivateTab(DialogTabItemVM tab)
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{
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foreach (var t in TagItems)
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t.IsSelected = false;
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tab.IsSelected = true;
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SelectedTag = tab;
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}
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#endregion
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public void Dispose()
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{
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_eventAggregator.GetEvent<AddDialogTabEvent>().Unsubscribe(OnAddTab);
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}
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}
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}
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