// 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 System;
using System.ComponentModel.Composition;
using System.Windows;
using Microsoft.CodeAnalysis.Editor;
using Microsoft.CodeAnalysis.Editor.Shared.Utilities;
using Microsoft.CodeAnalysis.Host.Mef;
using Microsoft.VisualStudio.Text.Editor;
 
namespace Microsoft.CodeAnalysis.Workspaces;
 
[Export(typeof(ITextBufferVisibilityTracker))]
internal sealed class WpfTextBufferVisibilityTracker
    : AbstractTextBufferVisibilityTracker<IWpfTextView, DependencyPropertyChangedEventHandler>
{
    [ImportingConstructor]
    [Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
    public WpfTextBufferVisibilityTracker(
        ITextBufferAssociatedViewService associatedViewService,
        IThreadingContext threadingContext)
        : base(associatedViewService, threadingContext)
    {
    }
 
    protected override bool IsVisible(IWpfTextView view)
        => view.VisualElement.IsVisible;
 
    protected override DependencyPropertyChangedEventHandler GetVisiblityChangeCallback(VisibleTrackerData visibleTrackerData)
        => (sender, args) => visibleTrackerData.TriggerCallbacks();
 
    protected override void AddVisibilityChangedCallback(IWpfTextView view, DependencyPropertyChangedEventHandler visibilityChangedCallback)
        => view.VisualElement.IsVisibleChanged += visibilityChangedCallback;
 
    protected override void RemoveVisibilityChangedCallback(IWpfTextView view, DependencyPropertyChangedEventHandler visibilityChangedCallback)
        => view.VisualElement.IsVisibleChanged -= visibilityChangedCallback;
 
}