FuzzyPanel

src/AppCommon/FileTime.App.FuzzyPanel/FuzzyPanelViewModel.cs

@@ -0,0 +1,68 @@
+using System.ComponentModel;
+using Avalonia.Input;
+using PropertyChanged.SourceGenerator;
+
+namespace FileTime.App.FuzzyPanel;
+
+public abstract partial class FuzzyPanelViewModel<TItem> : IFuzzyPanelViewModel<TItem> where TItem : class
+{
+    private string _searchText = String.Empty;
+
+    [Notify(set: Setter.Protected)] private IObservable<bool> _showWindow;
+    [Notify(set: Setter.Protected)] private List<TItem> _filteredMatches;
+    [Notify(set: Setter.Protected)] private TItem? _selectedItem;
+
+    public string SearchText
+    {
+        get => _searchText;
+        set
+        {
+            if (_searchText == value) return;
+
+            _searchText = value;
+            OnPropertyChanged(new PropertyChangedEventArgs(nameof(SearchText)));
+
+            UpdateFilteredMatchesInternal();
+        }
+    }
+
+    private void UpdateFilteredMatchesInternal()
+    {
+        UpdateFilteredMatches();
+        if (SelectedItem != null && FilteredMatches.Contains(SelectedItem)) return;
+
+        SelectedItem = FilteredMatches.Count > 0
+            ? FilteredMatches[0]
+            : null;
+    }
+
+    public abstract void UpdateFilteredMatches();
+
+    public virtual Task<bool> HandleKeyDown(KeyEventArgs keyEventArgs)
+    {
+        if (keyEventArgs.Key == Key.Down)
+        {
+            var nextItem = FilteredMatches.SkipWhile(i => i != SelectedItem).Skip(1).FirstOrDefault();
+
+            if (nextItem is not null)
+            {
+                SelectedItem = nextItem;
+            }
+
+            return Task.FromResult(true);
+        }
+        else if (keyEventArgs.Key == Key.Up)
+        {
+            var previousItem = FilteredMatches.TakeWhile(i => i != SelectedItem).LastOrDefault();
+
+            if (previousItem is not null)
+            {
+                SelectedItem = previousItem;
+            }
+
+            return Task.FromResult(true);
+        }
+
+        return Task.FromResult(false);
+    }
+}