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// 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;
}
}
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