如何在 VS2019 扩展 (MEF) 中获得活动的 IWpfTextView [英] How to get active IWpfTextView in VS2019 extension (MEF)

问题描述

我正在尝试在 VS2019 扩展中获取活动的 C# 编辑器 IWpfTextView.我正在使用小型 MEF 服务将视图注入 VSAsyncPackage.但它不是很可靠 - 有时注入的视图是错误的(例如从另一个视图)或丢失.这是服务:

I'm trying to get the active C# Editor IWpfTextView in VS2019 extension. I'm using a small MEF service to inject a view into the VSAsyncPackage. But it is not very reliable - sometimes the injected view is wrong (e.g. from another view) or missing. Here is the service:

public interface IActiveViewAccessor
{
    IWpfTextView? ActiveView { get; }
}

[Export(typeof(IWpfTextViewConnectionListener))]
[Export(typeof(IActiveViewAccessor))]
[ContentType("text")]
[TextViewRole(PredefinedTextViewRoles.Document)]
internal sealed class ActiveViewConnectionListener : IWpfTextViewConnectionListener, IActiveViewAccessor
    {
    public IWpfTextView? ActiveView { get; private set; }

    public void SubjectBuffersConnected(IWpfTextView textView, ConnectionReason reason, Collection<ITextBuffer> subjectBuffers)
    {
        this.ActiveView = textView;
    }

    public void SubjectBuffersDisconnected(IWpfTextView textView, ConnectionReason reason, Collection<ITextBuffer> subjectBuffers)
    {
        this.ActiveView = null;
    }
}

这个服务被注入到 VSPackage 中:

This service is being injected into the VSPackage as:

this.viewAccessor = this.exportProvider.GetExportedValue<IActiveViewAccessor>();

它被用作:

var view = this.viewAccessor?.ActiveView;

是否有更好更稳定的方式在异步 VSPackage 中获取 IWpfTextView?

Is there a better and more stable way to get IWpfTextView in the async VSPackage?

到目前为止，这里有一些相关的问题，但并不完全符合我的预期:

So far, here are some related questions but not exactly what I'd expected:

1. 如何从命令 Visual Studio 扩展中获取 IWpfTextView2017 (2017)
2. 如何获取 EnvDte.ActiveDocument 的 IWpfTextView?(2013)
3. 在 Visual Studio 扩展 (2012) 中访问当前代码窗格

推荐答案

经过一些调试和探索，我得出结论，我最初的方法非常幼稚.因为 IWpfTextViewConnectionListener 在一个简单的情况下每个编辑器窗口只触发一次，并且在已经连接的视图之间切换时不会触发.

After a bit of debugging and exploring, I concluded that my initial approach is very naive. Because IWpfTextViewConnectionListener is only firing once per editor window in a simple case, and it's not firing during switching between already connected views.

在试用它并潜入 我已将 IActiveViewAccessor 更改为:

After experimenting with it and sneaking into VsVim > VsAdapter.cs I've changed IActiveViewAccessor to the this:

public interface IActiveViewAccessor
{
    IWpfTextView? ActiveView { get; }
}

[Export(typeof(IActiveViewAccessor))]
internal sealed class ActiveViewAccessor : IActiveViewAccessor
{
    private readonly SVsServiceProvider serviceProvider;
    private readonly IVsEditorAdaptersFactoryService editorAdaptersFactoryService;

    [ImportingConstructor]
    public ActiveViewAccessor(
        SVsServiceProvider vsServiceProvider,
        IVsEditorAdaptersFactoryService editorAdaptersFactoryService)
    {
        this.serviceProvider = vsServiceProvider;
        this.editorAdaptersFactoryService = editorAdaptersFactoryService;
    }

    public IWpfTextView? ActiveView
    {
        get
        {
            IVsTextManager2 textManager =
                serviceProvider.GetService<SVsTextManager, IVsTextManager2>();

            if (textManager == null)
            {
                return null;
            }

            int hr = textManager.GetActiveView2(
                fMustHaveFocus: 1,
                pBuffer: null,
                grfIncludeViewFrameType: (uint)_VIEWFRAMETYPE.vftCodeWindow,
                ppView: out IVsTextView vsTextView);

            if (ErrorHandler.Failed(hr))
            {
                return null;
            }

            return editorAdaptersFactoryService.GetWpfTextView(vsTextView);
        }
    }
}

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