[DotGNU]Mouse question

[Brian Luft]

Hey all,

I've been writing the ListBox control.  Have a few questions:

1.  I wrote a function to return the width of the three border styles.  
Since this can vary between themes, I put this into 
IThemePainter/DefaultThemePainter.  Is this the best place for this?

2.  I want to support the case when the user is selecting list items by 
clicking and dragging, and then drags the mouse above or below the list 
box.  This should make the listbox scroll in that direction, and select 
the items on the way.  I've been using OnMouseMove for dragging inside 
the control, but I don't know how to get mouse move messages when the 
cursor is outside the control.

It was mentioned that XSharp gets mouse messages for the root window.  
I don't want to use XSharp directly though, because then my control 
won't port to other platforms.  Furthermore, I don't think that will 
work on OSX -- Apple X11 is rootless.  And on Windows, there's no way 
to get global mouse events without installing a system hook, which is 
bad news.  I looked around a bit and Microsoft suggests 
<http://www.microsoft.com/msj/1098/c/c1098.aspx> using a timer to poll 
for the mouse position -- ack!

I'm thinking that using a timer when the mouse leaves my control is the 
only way to do this.  Does anybody have a better idea, I hope? :)  
Also, would this code be better in the toolkit class?  Then we could 
use the actual root window messages on XSharp, and use the timer on 
Win32, etc.  Thoughts?

Thanks.  Brian