mirror of
https://gitcode.com/gh_mirrors/se/Semi.Avalonia
synced 2026-03-23 02:06:34 +08:00
misc: transfer TreeDataGrid demo.
This commit is contained in:
Zhang Dian
@@ -59,6 +59,25 @@ public class Song
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Url = $"https://music.163.com/song?id={netEaseId}";
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}
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public static List<string> Albums =>
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[
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"A.S.I.A",
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"饕餮人间",
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"七步咙咚呛",
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"大惊小怪",
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"The ONE",
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"以梦为马 (壮志骄阳版)",
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"emo了",
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"一眼万年",
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"冲刺吧",
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"爱的赏味期限",
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"COSMIC ANTHEM / 手紙",
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"世界晚安",
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"明年也要好好长大",
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"320万年前",
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"W.O.R.L.D."
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];
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public static List<Song> Songs =>
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[
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new("好肚有肚(feat.李玲玉)", "熊猫堂ProducePandas", 2, 50, "A.S.I.A", 730, 1487039339),
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@@ -0,0 +1,358 @@
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using System;
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using System.Collections.Generic;
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using System.Collections.ObjectModel;
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using System.ComponentModel;
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using System.Diagnostics;
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using System.IO;
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using System.Linq;
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using System.Runtime.InteropServices;
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using Avalonia.Controls;
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using Avalonia.Controls.Models.TreeDataGrid;
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using Avalonia.Controls.Selection;
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using Avalonia.Threading;
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using CommunityToolkit.Mvvm.ComponentModel;
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namespace Semi.Avalonia.Demo.ViewModels;
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public partial class FilesPageViewModel : ObservableObject
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{
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public IList<string> Drives { get; }
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public HierarchicalTreeDataGridSource<FileNodeViewModel> Source { get; }
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[ObservableProperty] private string _selectedDrive;
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[ObservableProperty] private string? _selectedPath;
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[ObservableProperty] private FileNodeViewModel? _root;
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partial void OnSelectedDriveChanged(string value)
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{
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Root = new FileNodeViewModel(value, true, true);
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if (Source is not null)
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{
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Source.Items = [Root];
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}
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}
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public FilesPageViewModel()
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{
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Drives = DriveInfo.GetDrives().Select(x => x.Name).ToList();
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if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
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{
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SelectedDrive = @"C:\";
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}
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else
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{
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SelectedDrive = Drives.FirstOrDefault() ?? "/";
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}
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Source = new HierarchicalTreeDataGridSource<FileNodeViewModel>(Array.Empty<FileNodeViewModel>())
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{
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Columns =
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{
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new CheckBoxColumn<FileNodeViewModel>(
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null,
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x => x.IsChecked,
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(o, v) => o.IsChecked = v,
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options: new CheckBoxColumnOptions<FileNodeViewModel>
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{
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CanUserResizeColumn = false,
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}),
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new HierarchicalExpanderColumn<FileNodeViewModel>(
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new TemplateColumn<FileNodeViewModel>(
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"Name",
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"FileNameCell",
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"FileNameEditCell",
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new GridLength(1, GridUnitType.Star),
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new TemplateColumnOptions<FileNodeViewModel>
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{
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CompareAscending = FileNodeViewModel.SortAscending(vm => vm.Name),
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CompareDescending = FileNodeViewModel.SortDescending(vm => vm.Name),
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IsTextSearchEnabled = true,
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TextSearchValueSelector = vm => vm.Name
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}),
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vm => vm.Children,
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vm => vm.HasChildren,
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vm => vm.IsExpanded),
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new TextColumn<FileNodeViewModel, long?>(
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"Size",
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vm => vm.Size,
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options: new TextColumnOptions<FileNodeViewModel>
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{
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CompareAscending = FileNodeViewModel.SortAscending(x => x.Size),
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CompareDescending = FileNodeViewModel.SortDescending(x => x.Size),
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}),
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new TextColumn<FileNodeViewModel, DateTimeOffset?>(
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"Modified",
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x => x.Modified,
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options: new TextColumnOptions<FileNodeViewModel>
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{
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CompareAscending = FileNodeViewModel.SortAscending(x => x.Modified),
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CompareDescending = FileNodeViewModel.SortDescending(x => x.Modified),
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}),
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}
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};
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Source.RowSelection!.SingleSelect = false;
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Source.RowSelection.SelectionChanged += SelectionChanged;
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}
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private void SelectionChanged(object? sender, TreeSelectionModelSelectionChangedEventArgs<FileNodeViewModel> e)
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{
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var selectedPath = Source.RowSelection?.SelectedItem?.Path;
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this.SetProperty(ref _selectedPath, selectedPath, nameof(SelectedPath));
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foreach (var i in e.DeselectedItems)
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Trace.WriteLine($"Deselected '{i?.Path}'");
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foreach (var i in e.SelectedItems)
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Trace.WriteLine($"Selected '{i?.Path}'");
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}
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private void SetSelectedPath(string? value)
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{
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if (string.IsNullOrEmpty(value))
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{
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Source.RowSelection!.Clear();
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return;
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}
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var path = value;
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var components = new Stack<string>();
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DirectoryInfo? d = null;
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if (File.Exists(path))
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{
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var f = new FileInfo(path);
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components.Push(f.Name);
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d = f.Directory;
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}
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else if (Directory.Exists(path))
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{
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d = new DirectoryInfo(path);
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}
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while (d is not null)
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{
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components.Push(d.Name);
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d = d.Parent;
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}
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var index = IndexPath.Unselected;
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if (components.Count > 0)
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{
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var drive = components.Pop();
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var driveIndex = Drives.FindIndex(x => string.Equals(x, drive, StringComparison.OrdinalIgnoreCase));
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if (driveIndex >= 0)
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SelectedDrive = Drives[driveIndex];
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FileNodeViewModel? node = _root;
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index = new IndexPath(0);
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while (node is not null && components.Count > 0)
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{
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node.IsExpanded = true;
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var component = components.Pop();
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var i = node.Children.FindIndex(x => string.Equals(x.Name, component, StringComparison.OrdinalIgnoreCase));
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node = i >= 0 ? node.Children[i] : null;
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index = i >= 0 ? index.Append(i) : default;
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}
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}
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Source.RowSelection!.SelectedIndex = index;
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}
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}
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public partial class FileNodeViewModel : ObservableObject, IEditableObject
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{
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[ObservableProperty] private string _path;
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[ObservableProperty] private string _name;
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private string? _undoName;
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[ObservableProperty] private long? _size;
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[ObservableProperty] private DateTimeOffset? _modified;
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private FileSystemWatcher? _watcher;
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private ObservableCollection<FileNodeViewModel>? _children;
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[ObservableProperty] private bool _hasChildren = true;
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[ObservableProperty] private bool _isExpanded;
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public FileNodeViewModel(string path, bool isDirectory, bool isRoot = false)
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{
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Path = path;
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Name = isRoot ? path : System.IO.Path.GetFileName(Path);
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IsExpanded = isRoot;
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IsDirectory = isDirectory;
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HasChildren = isDirectory;
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if (!isDirectory)
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{
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var info = new FileInfo(path);
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Size = info.Length;
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Modified = info.LastWriteTimeUtc;
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}
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}
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public bool IsChecked { get; set; }
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public bool IsDirectory { get; }
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public IReadOnlyList<FileNodeViewModel> Children => _children ??= LoadChildren();
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private ObservableCollection<FileNodeViewModel> LoadChildren()
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{
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if (!IsDirectory)
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{
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throw new NotSupportedException();
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}
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var options = new EnumerationOptions { IgnoreInaccessible = true };
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var result = new ObservableCollection<FileNodeViewModel>();
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foreach (var d in Directory.EnumerateDirectories(Path, "*", options))
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{
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result.Add(new FileNodeViewModel(d, true));
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}
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foreach (var f in Directory.EnumerateFiles(Path, "*", options))
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{
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result.Add(new FileNodeViewModel(f, false));
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}
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_watcher = new FileSystemWatcher
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{
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Path = Path,
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NotifyFilter = NotifyFilters.FileName | NotifyFilters.Size | NotifyFilters.LastWrite,
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};
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_watcher.Changed += OnChanged;
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_watcher.Created += OnCreated;
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_watcher.Deleted += OnDeleted;
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_watcher.Renamed += OnRenamed;
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_watcher.EnableRaisingEvents = true;
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if (result.Count == 0)
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HasChildren = false;
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return result;
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}
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public static Comparison<FileNodeViewModel?> SortAscending<T>(Func<FileNodeViewModel, T> selector)
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{
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return (x, y) =>
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{
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if (x is null && y is null)
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return 0;
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else if (x is null)
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return -1;
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else if (y is null)
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return 1;
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if (x.IsDirectory == y.IsDirectory)
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return Comparer<T>.Default.Compare(selector(x), selector(y));
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else if (x.IsDirectory)
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return -1;
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else
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return 1;
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};
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}
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public static Comparison<FileNodeViewModel?> SortDescending<T>(Func<FileNodeViewModel, T> selector)
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{
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return (x, y) =>
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{
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if (x is null && y is null)
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return 0;
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else if (x is null)
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return 1;
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else if (y is null)
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return -1;
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if (x.IsDirectory == y.IsDirectory)
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return Comparer<T>.Default.Compare(selector(y), selector(x));
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else if (x.IsDirectory)
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return -1;
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else
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return 1;
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};
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}
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void IEditableObject.BeginEdit() => _undoName = _name;
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void IEditableObject.CancelEdit() => _name = _undoName!;
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void IEditableObject.EndEdit() => _undoName = null;
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private void OnChanged(object sender, FileSystemEventArgs e)
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{
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if (e.ChangeType == WatcherChangeTypes.Changed && File.Exists(e.FullPath))
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{
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Dispatcher.UIThread.Post(() =>
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{
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foreach (var child in _children!)
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{
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if (child.Path == e.FullPath)
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{
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if (!child.IsDirectory)
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{
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var info = new FileInfo(e.FullPath);
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child.Size = info.Length;
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child.Modified = info.LastWriteTimeUtc;
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}
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break;
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}
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}
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});
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}
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}
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private void OnCreated(object sender, FileSystemEventArgs e)
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{
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Dispatcher.UIThread.Post(() =>
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{
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var node = new FileNodeViewModel(
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e.FullPath,
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File.GetAttributes(e.FullPath).HasFlag(FileAttributes.Directory));
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_children!.Add(node);
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});
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}
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private void OnDeleted(object sender, FileSystemEventArgs e)
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{
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Dispatcher.UIThread.Post(() =>
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{
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for (var i = 0; i < _children!.Count; ++i)
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{
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if (_children[i].Path == e.FullPath)
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{
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_children.RemoveAt(i);
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Debug.WriteLine($"Removed {e.FullPath}");
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break;
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}
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}
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});
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}
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private void OnRenamed(object sender, RenamedEventArgs e)
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{
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Dispatcher.UIThread.Post(() =>
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{
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foreach (var child in _children!)
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{
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if (child.Path == e.OldFullPath)
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{
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child.Path = e.FullPath;
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child.Name = e.Name ?? string.Empty;
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break;
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}
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}
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});
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}
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}
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internal static class ListExtensions
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{
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public static int FindIndex<T>(this IEnumerable<T> source, Func<T, bool> predicate)
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{
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int i = 0;
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foreach (var item in source)
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{
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if (predicate(item))
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return i;
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i++;
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}
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return -1;
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}
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}
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@@ -0,0 +1,54 @@
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using System.Collections.ObjectModel;
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using System.Linq;
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using Avalonia.Controls;
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using Avalonia.Controls.Models.TreeDataGrid;
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using CommunityToolkit.Mvvm.ComponentModel;
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namespace Semi.Avalonia.Demo.ViewModels;
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public class SongsPageViewModel : ObservableObject
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{
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public FlatTreeDataGridSource<SongViewModel> Songs { get; }
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public SongsPageViewModel()
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{
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var songs = new ObservableCollection<SongViewModel>(Song.Songs.Select(a => new SongViewModel()
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{
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Title = a.Title,
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Artist = a.Artist,
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Album = a.Album,
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CountOfComment = a.CountOfComment,
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IsSelected = false
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}));
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Songs = new FlatTreeDataGridSource<SongViewModel>(songs)
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{
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Columns =
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{
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new CheckBoxColumn<SongViewModel>(
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"IsSelected",
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a => a.IsSelected,
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(model, b) => { model.IsSelected = b; },
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new GridLength(108, GridUnitType.Pixel)),
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new TextColumn<SongViewModel, string>(
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"Title",
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a => a.Title,
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(o, a) => o.Title = a,
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new GridLength(6, GridUnitType.Star)),
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new TextColumn<SongViewModel, string>("Artist",
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a => a.Artist,
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(o, a) => o.Artist = a,
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new GridLength(6, GridUnitType.Star)),
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new TemplateColumn<SongViewModel>("Album",
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"AlbumCell",
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"AlbumEditCell",
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new GridLength(6, GridUnitType.Star)),
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new TemplateColumn<SongViewModel>(
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"Comments",
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"CommentsCell",
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"CommentsEditCell",
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new GridLength(6, GridUnitType.Star)),
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}
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};
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}
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}
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@@ -0,0 +1,9 @@
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using CommunityToolkit.Mvvm.ComponentModel;
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||||
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namespace Semi.Avalonia.Demo.ViewModels;
|
||||
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public class TreeDataGridDemoViewModel: ObservableObject
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{
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public SongsPageViewModel SongsContext { get; } = new();
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public FilesPageViewModel FilesContext { get; } = new();
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}
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Reference in New Issue
Block a user
