80 lines
2.4 KiB
C#
80 lines
2.4 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Reactive.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using System.Windows;
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using DynamicData;
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using ReactiveUI;
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namespace NodeNetwork.ViewModels
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{
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/// <summary>
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/// Viewmodel for the view that is used to select nodes by dragging a rectangle around them.
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/// </summary>
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public class SelectionRectangleViewModel : ReactiveObject
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{
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#region StartPoint
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/// <summary>
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/// The coordinates of the first corner of the rectangle (where the user clicked down).
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/// </summary>
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public Point StartPoint
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{
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get => _startPoint;
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set => this.RaiseAndSetIfChanged(ref _startPoint, value);
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}
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private Point _startPoint;
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#endregion
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#region EndPoint
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/// <summary>
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/// The coordinates of the second corner of the rectangle.
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/// </summary>
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public Point EndPoint
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{
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get => _endPoint;
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set => this.RaiseAndSetIfChanged(ref _endPoint, value);
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}
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private Point _endPoint;
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#endregion
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#region Rectangle
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/// <summary>
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/// The Rect object formed by StartPoint and EndPoint.
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/// </summary>
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public Rect Rectangle => _rectangle.Value;
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private readonly ObservableAsPropertyHelper<Rect> _rectangle;
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#endregion
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#region IsVisible
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/// <summary>
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/// If true, the selection rectangle view is visible.
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/// </summary>
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public bool IsVisible
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{
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get => _isVisible;
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set => this.RaiseAndSetIfChanged(ref _isVisible, value);
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}
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private bool _isVisible;
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#endregion
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#region IntersectingNodes
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/// <summary>
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/// List of nodes visually intersecting or contained in the rectangle.
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/// This list is driven by the view.
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/// </summary>
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public ISourceList<NodeViewModel> IntersectingNodes { get; } = new SourceList<NodeViewModel>();
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#endregion
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public SelectionRectangleViewModel()
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{
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this.WhenAnyValue(vm => vm.StartPoint, vm => vm.EndPoint)
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.Select(_ => new Rect(StartPoint, EndPoint))
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.ToProperty(this, vm => vm.Rectangle, out _rectangle);
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IntersectingNodes.Connect().ActOnEveryObject(node => node.IsSelected = true, node => node.IsSelected = false);
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}
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}
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}
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