Issues after I add a command filter to textview

问题

I want to intercept key events in vs. I searched many articles for help, and this article inspired me. What I have done is:

create a new class and implement "IVsTextManagerEvents" interface to register every textview.

public void OnRegisterView(IVsTextView pView)
{
    CommandFilter filter = new CommandFilter();
    IOleCommandTarget nextCommandTarget;
    pView.AddCommandFilter(filter, out nextCommandTarget);
    filter.NextCommandTarget = nextCommandTarget;
}

add new class "CommandFilter" which implement IOleCommandTarget , in which we can intercept olecommand from vs

public class CommandFilter : IOleCommandTarget
{    

    public IOleCommandTarget NextCommandTarget
    {
        get; 
        set;
    }

    public int QueryStatus(ref Guid pguidCmdGroup, uint cCmds, OLECMD[] prgCmds, IntPtr pCmdText)
    {
        NextCommandTarget.QueryStatus(ref pguidCmdGroup, cCmds, prgCmds, pCmdText);
        return VSConstants.S_OK;
    }

    public int Exec(ref Guid pguidCmdGroup, uint nCmdID, uint nCmdexecopt, IntPtr pvaIn, IntPtr pvaOut)
    {
        if (pguidCmdGroup == typeof(VSConstants.VSStd2KCmdID).GUID)
        {
            switch (nCmdID)
            {
                case (uint)VSConstants.VSStd2KCmdID.RETURN:
                    MessageBox.Show("enter");
                    break;
            }
        }

        NextCommandTarget.Exec(pguidCmdGroup, nCmdID, nCmdexecopt, pvaIn, pvaOut);

        return VSConstants.S_OK;
    }
}

we need to advise IVsTextManagerEvents in Initialize

protected override void Initialize()
{
    base.Initialize();

    IConnectionPointContainer textManager = (IConnectionPointContainer)GetService(typeof(SVsTextManager));
    Guid interfaceGuid = typeof(IVsTextManagerEvents).GUID;
    textManager.FindConnectionPoint(ref interfaceGuid, out tmConnectionPoint);
    tmConnectionPoint.Advise(new TextManagerEventSink(), out tmConnectionCookie);
}

after above prepare, we can now intercept key events. you can see a message box after you stroke key "enter".

My question is, after I have done above

I can't save the document, that means when I stroked ctrl+S, nothing happened.
You can see obvious delay, when I key in words. It seems my package take a long time to handle something, but as you can see above, I didn't at all.

回答1:

It seems I have found the answer!

Not:

NextCommandTarget.Exec(pguidCmdGroup, nCmdID, nCmdexecopt, pvaIn, pvaOut);

return VSConstants.S_OK;

But:

return NextCommandTarget.Exec(pguidCmdGroup, nCmdID, nCmdexecopt, pvaIn, pvaOut);

来源：https://stackoverflow.com/questions/8544203/issues-after-i-add-a-command-filter-to-textview

标签

visual-studio

vsx