customizing textbox contextmenu

[trebahl]

I would like to customize the context menu of a textbox: I would like to keep the default items and add new ones. Unfortunately, if I understand correctly, the default context menu for textboxes is never assigned to the ContextMenu property, it is generated on the fly in response to ContextMenuOpening. So it seems there is no way to customize it, I need to build a context menu from scratch. Is that correct?

[miloush]

That is correct. You could theoretically subscribe to TextBox.LostKeyboardFocus and the menu should be in e.NewFocus

[trebahl]

Thanks. Sounds a bit brittle though and requires waiting for the event to be processed. I found an alternative based on the fact that context menus capture the mouse:

        [DllImport("user32.dll", ExactSpelling = true, CharSet = CharSet.Auto)]
        static extern IntPtr GetCapture();

        ContexMenu FindCurrentCtx()
        {
            var cap = GetCapture();
            var ps = HwndSource.FromHwnd(cap);
            if (ps != null)
            {
                foreach (var o in ps.RootVisual.Offspring()) // Offspring is an extension method of mine to iterate over the visual tree
                {
                    if (o is ContextMenu cm) return cm;
                }
            }
            return null;
        }

[miloush]

If you are looking for an element with mouse capture, there is MouseDevice.Captured

[trebahl]

Great, that directly returns the context menu!