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CodeJoin.xaml.cs
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CodeJoin.xaml.cs
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using System.Reactive;
using System.Reactive.Linq;
using System.Windows;
using System.Windows.Input;
namespace LinqQueries;
/// <summary>
/// Interaction logic for CodeJoin.xaml
/// </summary>
public partial class CodeJoin : Window
{
public CodeJoin()
{
InitializeComponent();
IObservable<EventPattern<MouseEventArgs>> downs =
Observable.FromEventPattern<MouseEventArgs>(
background, nameof(background.MouseDown));
IObservable<EventPattern<MouseEventArgs>> ups =
Observable.FromEventPattern<MouseEventArgs>(
background, nameof(background.MouseUp));
IObservable<EventPattern<MouseEventArgs>> allMoves =
Observable.FromEventPattern<MouseEventArgs>(
background, nameof(background.MouseMove));
IObservable<Point> dragPositions = downs.Join(
allMoves,
down => ups,
move => allMoves,
(down, move) => move.EventArgs.GetPosition(background));
dragPositions.Subscribe(point => { line.Points.Add(point); });
}
}