Main window steal some key presses from child window

[lsoft]

I have an opened editor with some file in it. Then I invoke command which does simply

            var window = new W();
            window.Show();

where W is an empty regular WPF window (with NO controls). The window is active. Then if I press Backspace then one symbol is removed in the opened editor inside main window of VS.

For some reason I cannot set child window as modal. Any ideas how to fix that and why it happens?

[StevenRasmussen]

If I'm remembering correctly, there is no support for non-modal windows. All windows must be opened modally to work properly. Someone else can clarify if they understand differently.

[StevenRasmussen]

See here for more info.

[lsoft]

All windows must be opened modally

or be a tool window. may be you are right, thanks for rapid answer.

If so, I wonder how they do this:

I suspected these are topmost windows, but looks like I'm wrong.... uh, this is a difficult way to be a VSIXer =)

[StevenRasmussen]

or be a tool window

Correct. That's a different beast though.

As to how they do what's shown in your image... no idea 🤷. VSIX extensions have different limitations than the core product of Visual Studio 😉

[lsoft]

The solution is to disable key processing inside main window, when second window is opened. Same for adornment layer control, if one prefer adornment approach.

One need to setup the assembly as MefComponent, and just add the code:

    [Export(typeof(IVsTextViewCreationListener))]
    [ContentType("text")]
    [TextViewRole(PredefinedTextViewRoles.Editable)]
    internal sealed class AdornmentInputFilterProvider : IVsTextViewCreationListener
    {
        [Import] internal IVsEditorAdaptersFactoryService Adapters = null!;

        public void VsTextViewCreated(IVsTextView textViewAdapter)
        {
            var wpfTextView = Adapters.GetWpfTextView(textViewAdapter);
            var filter = new AdornmentInputCommandFilter(/*manager*/);
            textViewAdapter.AddCommandFilter(filter, out var next);
            filter.Next = next;
        }
    }

    internal sealed class AdornmentInputCommandFilter : IOleCommandTarget
    {
        public IOleCommandTarget? Next
        {
            get; set;
        }

        public static System.Windows.Window? Adornment;

        public AdornmentInputCommandFilter()
        {
        }

        private bool IsAdornmentFocused =>
            Adornment != null && Adornment.IsKeyboardFocusWithin;

        public int QueryStatus(ref Guid pguidCmdGroup, uint nCmdID, OLECMD[] prgCmds, IntPtr pCmdText)
        {
            if (IsAdornmentFocused)
            {
                return VSConstants.S_FALSE;
            }

            return
                Next?.QueryStatus(ref pguidCmdGroup, nCmdID, prgCmds, pCmdText)
                ?? VSConstants.S_OK
                ;
        }

        public int Exec(ref Guid pguidCmdGroup, uint nCmdID, uint nCmdexecopt, IntPtr pvaIn, IntPtr pvaOut)
        {
            if (_suppress)
            {
                return VSConstants.S_FALSE;
            }

            return Next != null
                ? Next.Exec(ref pguidCmdGroup, nCmdID, nCmdexecopt, pvaIn, pvaOut)
                : VSConstants.S_OK
                ;
        }
    }

and set public static System.Windows.Window? Adornment; to not-null value when child window is opened, and set it null when closed.

hope it will help somebody.

mein gott, 2 days of pain =)