Dariusz Komosiński
7 years ago
committed by
GitHub
GitHub
8 changed files with 477 additions and 709 deletions
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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.Linq; |
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using System.Reactive; |
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using Avalonia.Controls; |
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using ReactiveUI; |
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namespace ControlCatalog.ViewModels |
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{ |
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public class TreeViewPageViewModel : ReactiveObject |
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{ |
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private readonly Node _root; |
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private SelectionMode _selectionMode; |
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public TreeViewPageViewModel() |
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{ |
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_root = new Node(); |
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Items = _root.Children; |
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Selection = new SelectionModel(); |
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Selection.SelectionChanged += SelectionChanged; |
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AddItemCommand = ReactiveCommand.Create(AddItem); |
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RemoveItemCommand = ReactiveCommand.Create(RemoveItem); |
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} |
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public ObservableCollection<Node> Items { get; } |
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public SelectionModel Selection { get; } |
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public ReactiveCommand<Unit, Unit> AddItemCommand { get; } |
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public ReactiveCommand<Unit, Unit> RemoveItemCommand { get; } |
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public SelectionMode SelectionMode |
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{ |
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get => _selectionMode; |
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set |
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{ |
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Selection.ClearSelection(); |
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this.RaiseAndSetIfChanged(ref _selectionMode, value); |
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} |
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} |
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private void AddItem() |
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{ |
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var parentItem = Selection.SelectedItems.Count > 0 ? (Node)Selection.SelectedItems[0] : _root; |
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parentItem.AddItem(); |
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} |
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private void RemoveItem() |
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{ |
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while (Selection.SelectedItems.Count > 0) |
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{ |
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Node lastItem = (Node)Selection.SelectedItems[0]; |
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RecursiveRemove(Items, lastItem); |
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Selection.DeselectAt(Selection.SelectedIndices[0]); |
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} |
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bool RecursiveRemove(ObservableCollection<Node> items, Node selectedItem) |
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{ |
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if (items.Remove(selectedItem)) |
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{ |
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return true; |
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} |
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foreach (Node item in items) |
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{ |
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if (item.AreChildrenInitialized && RecursiveRemove(item.Children, selectedItem)) |
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{ |
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return true; |
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} |
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} |
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return false; |
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} |
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} |
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private void SelectionChanged(object sender, SelectionModelSelectionChangedEventArgs e) |
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{ |
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var selected = string.Join(",", e.SelectedIndices); |
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var deselected = string.Join(",", e.DeselectedIndices); |
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System.Diagnostics.Debug.WriteLine($"Selected '{selected}', Deselected '{deselected}'"); |
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} |
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public class Node |
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{ |
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private ObservableCollection<Node> _children; |
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private int _childIndex = 10; |
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public Node() |
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{ |
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Header = "Item"; |
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} |
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public Node(Node parent, int index) |
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{ |
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Parent = parent; |
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Header = parent.Header + ' ' + index; |
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} |
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public Node Parent { get; } |
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public string Header { get; } |
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public bool AreChildrenInitialized => _children != null; |
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public ObservableCollection<Node> Children => _children ??= CreateChildren(); |
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public void AddItem() => Children.Add(new Node(this, _childIndex++)); |
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public void RemoveItem(Node child) => Children.Remove(child); |
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public override string ToString() => Header; |
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private ObservableCollection<Node> CreateChildren() |
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{ |
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return new ObservableCollection<Node>( |
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Enumerable.Range(0, 10).Select(i => new Node(this, i))); |
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} |
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} |
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} |
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} |
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