Initial commit: FluidExplorer：从零实现的 WinUI 3 文件资源管理器替代品（Mica、命令栏、面包屑）
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using System.Collections.Specialized;
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using System.ComponentModel;
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using FluidExplorer.ViewModels;
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using Microsoft.UI.Xaml;
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using Microsoft.UI.Xaml.Automation;
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using Microsoft.UI.Xaml.Controls;
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using Microsoft.UI.Xaml.Data;
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using Microsoft.UI.Xaml.Media;
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namespace FluidExplorer.Views;
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/// <summary>
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/// 窗口内容宿主：标签栏（位于标题栏区域）+ 文件操作队列面板。
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/// 标签容器由代码手工创建与同步，不依赖 TabView 的 ItemsSource 绑定（后者在增删标签时不稳定）。
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/// </summary>
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public sealed partial class ShellView : UserControl
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{
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private readonly Dictionary<ExplorerTabViewModel, TabViewItem> _containers = [];
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private bool _syncingSelection;
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public ShellView()
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{
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InitializeComponent();
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}
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public static readonly DependencyProperty ViewModelProperty = DependencyProperty.Register(
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nameof(ViewModel),
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typeof(MainViewModel),
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typeof(ShellView),
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new PropertyMetadata(null, OnViewModelChanged));
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public MainViewModel? ViewModel
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{
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get => (MainViewModel?)GetValue(ViewModelProperty);
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set => SetValue(ViewModelProperty, value);
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}
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/// <summary>标题栏拖动区（宿主窗口用 SetTitleBar 指向它）。</summary>
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public FrameworkElement DragRegion => TitleBarDragRegion;
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/// <summary>供主题切换使用的根元素。</summary>
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public FrameworkElement ThemedRoot => RootGrid;
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public void ShowOperationQueue()
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{
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if (ViewModel is not null) ViewModel.IsQueueExpanded = true;
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QueuePanel.Visibility = Visibility.Visible;
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}
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// ── 标签页容器同步 ──────────────────────────────────────────────────────
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private static void OnViewModelChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
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{
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var shell = (ShellView)d;
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if (e.OldValue is MainViewModel old)
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{
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old.Tabs.CollectionChanged -= shell.OnTabsChanged;
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old.PropertyChanged -= shell.OnViewModelPropertyChanged;
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}
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if (e.NewValue is MainViewModel fresh)
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{
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fresh.Tabs.CollectionChanged += shell.OnTabsChanged;
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fresh.PropertyChanged += shell.OnViewModelPropertyChanged;
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shell.SyncAllTabs();
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}
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}
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private void OnViewModelPropertyChanged(object? sender, PropertyChangedEventArgs e)
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{
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if (e.PropertyName != nameof(MainViewModel.SelectedTab) || ViewModel?.SelectedTab is not { } tab) return;
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if (_containers.TryGetValue(tab, out var container) && !ReferenceEquals(TabHost.SelectedItem, container))
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{
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_syncingSelection = true;
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TabHost.SelectedItem = container;
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_syncingSelection = false;
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}
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}
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private void OnTabsChanged(object? sender, NotifyCollectionChangedEventArgs e)
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{
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try
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{
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ApplyTabsChanged(e);
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}
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catch (Exception ex)
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{
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// 标签容器同步失败不能让异常逃进 WinRT 回调（会变成 stowed exception 结束进程）
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App.Log($"标签页容器同步失败: {ex}");
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}
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}
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private void ApplyTabsChanged(NotifyCollectionChangedEventArgs e)
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{
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if (e.Action == NotifyCollectionChangedAction.Reset)
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{
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SyncAllTabs();
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return;
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}
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if (e.OldItems is not null)
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{
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foreach (ExplorerTabViewModel tab in e.OldItems)
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{
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if (_containers.Remove(tab, out var container)) TabHost.TabItems.Remove(container);
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}
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}
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if (e.NewItems is not null)
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{
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foreach (ExplorerTabViewModel tab in e.NewItems) AddContainer(tab);
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}
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if (ViewModel?.SelectedTab is { } selected && _containers.TryGetValue(selected, out var target))
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{
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_syncingSelection = true;
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TabHost.SelectedItem = target;
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_syncingSelection = false;
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}
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}
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private void SyncAllTabs()
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{
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TabHost.TabItems.Clear();
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_containers.Clear();
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if (ViewModel is null) return;
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foreach (var tab in ViewModel.Tabs) AddContainer(tab);
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if (ViewModel.SelectedTab is { } selected && _containers.TryGetValue(selected, out var target))
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{
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_syncingSelection = true;
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TabHost.SelectedItem = target;
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_syncingSelection = false;
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}
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}
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private void AddContainer(ExplorerTabViewModel tab)
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{
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if (_containers.ContainsKey(tab)) return;
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var header = new StackPanel { Orientation = Orientation.Horizontal, Spacing = 8, VerticalAlignment = VerticalAlignment.Center };
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var icon = new FontIcon { FontSize = 14 };
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if (Application.Current.Resources.TryGetValue("SymbolThemeFontFamily", out var family) && family is FontFamily fontFamily)
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icon.FontFamily = fontFamily;
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icon.SetBinding(FontIcon.GlyphProperty, new Binding
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{
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Path = new PropertyPath(nameof(ExplorerTabViewModel.Glyph)),
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Source = tab,
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Mode = BindingMode.OneWay
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});
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var text = new TextBlock { MaxWidth = 200, TextTrimming = TextTrimming.CharacterEllipsis, VerticalAlignment = VerticalAlignment.Center };
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text.SetBinding(TextBlock.TextProperty, new Binding
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{
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Path = new PropertyPath(nameof(ExplorerTabViewModel.Header)),
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Source = tab,
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Mode = BindingMode.OneWay
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});
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header.Children.Add(icon);
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header.Children.Add(text);
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var container = new TabViewItem
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{
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Header = header,
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Content = new ExplorerTabView { TabViewModel = tab },
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DataContext = tab
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};
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AutomationProperties.SetName(container, tab.Header);
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_containers[tab] = container;
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TabHost.TabItems.Add(container);
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}
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private void OnTabSelectionChanged(object sender, SelectionChangedEventArgs e)
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{
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if (_syncingSelection || ViewModel is null) return;
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if (TabHost.SelectedItem is TabViewItem { DataContext: ExplorerTabViewModel tab })
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ViewModel.SelectedTab = tab;
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}
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private void OnAddTabButtonClick(TabView sender, object args)
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{
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// 延后到 TabView 自身的点击/布局处理完成后再增删标签集合，并吞掉任何异常：
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// 从 DispatcherQueue 回调里逃出去的异常会变成 stowed exception 直接结束进程。
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DispatcherQueue.TryEnqueue(() =>
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{
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try
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{
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ViewModel?.NewTabCommand.Execute(null);
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}
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catch (Exception ex)
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{
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App.Log($"添加标签页失败: {ex}");
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}
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});
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}
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private void OnTabCloseRequested(TabView sender, TabViewTabCloseRequestedEventArgs args)
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{
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if (ViewModel is null) return;
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if (args.Item is TabViewItem { DataContext: ExplorerTabViewModel tab })
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{
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if (ViewModel.Tabs.Count <= 1)
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{
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App.MainWindowInstance.Close();
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return;
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}
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ViewModel.CloseTabCommand.Execute(tab);
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return;
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}
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App.MainWindowInstance.Close();
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}
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private void OnTabDroppedOutside(TabView sender, TabViewTabDroppedOutsideEventArgs args)
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{
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// 单窗口策略：拖出标签时仅保留在当前窗口，避免状态分散
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if (args.Tab is TabViewItem { DataContext: ExplorerTabViewModel tab } && ViewModel is not null)
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ViewModel.SelectedTab = tab;
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}
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private void OnClearFinishedJobsClick(object sender, RoutedEventArgs e) => ViewModel?.ClearFinishedJobsCommand.Execute(null);
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private void OnCollapseQueueClick(object sender, RoutedEventArgs e)
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{
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if (ViewModel is not null) ViewModel.IsQueueExpanded = false;
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QueuePanel.Visibility = Visibility.Collapsed;
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}
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private void OnPauseJobClick(object sender, RoutedEventArgs e)
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{
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if (sender is FrameworkElement { Tag: JobRowViewModel row }) ViewModel?.PauseJobCommand.Execute(row);
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}
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private void OnCancelJobClick(object sender, RoutedEventArgs e)
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{
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if (sender is FrameworkElement { Tag: JobRowViewModel row }) ViewModel?.CancelJobCommand.Execute(row);
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}
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}
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