// 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 Roslyn.Utilities;
 
namespace Microsoft.CodeAnalysis.Editor.Shared.Tagging;
 
internal partial class TaggerEventSources
{
    private class ReadOnlyRegionsChangedEventSource : AbstractTaggerEventSource
    {
        private readonly ITextBuffer _subjectBuffer;
 
        public ReadOnlyRegionsChangedEventSource(ITextBuffer subjectBuffer)
        {
            Contract.ThrowIfNull(subjectBuffer);
            _subjectBuffer = subjectBuffer;
        }
 
        public override void Connect()
            => _subjectBuffer.ReadOnlyRegionsChanged += OnReadOnlyRegionsChanged;
 
        public override void Disconnect()
            => _subjectBuffer.ReadOnlyRegionsChanged -= OnReadOnlyRegionsChanged;
 
        private void OnReadOnlyRegionsChanged(object? sender, SnapshotSpanEventArgs e)
            => this.RaiseChanged();
    }
}