// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
 
using Microsoft.VisualStudio.Text;
using Microsoft.VisualStudio.Text.Editor;
using Roslyn.Utilities;
 
namespace Microsoft.CodeAnalysis.Editor.Shared.Tagging;
 
internal partial class TaggerEventSources
{
    private class CaretPositionChangedEventSource : AbstractTaggerEventSource
    {
        private readonly ITextView _textView;
 
        public CaretPositionChangedEventSource(ITextView textView, ITextBuffer subjectBuffer)
        {
            Contract.ThrowIfNull(textView);
            Contract.ThrowIfNull(subjectBuffer);
 
            _textView = textView;
        }
 
        public override void Connect()
            => _textView.Caret.PositionChanged += OnCaretPositionChanged;
 
        public override void Disconnect()
            => _textView.Caret.PositionChanged -= OnCaretPositionChanged;
 
        private void OnCaretPositionChanged(object? sender, CaretPositionChangedEventArgs e)
            => this.RaiseChanged();
    }
}