Mouse wheel on the splitter = fun

[Basile B. via Digitalmars-d-ide]

I've recently added this to Coedit: the split between the widgets 
can be srolled and the mouse pointer follows.

Then As I'm building a GUI framework in D I've added what's 
necessary to reproduce it in D. It's fun with free mouse wheels.

https://vimeo.com/170517792

And it's stupid simple:

struct Mouse
{
     private OsWindowHandle _winHdl;

     /// Constructs an instance with the handle of the target 
window.
     this(OsWindowHandle winHdl)
     {
         _winHdl = winHdl;
     }

     /// Returns the mouse position as a point of int.
     Point!int position() const
     {
         Point!int result;
         version(linux)
         {
             int a,b;
             uint c;
             Window r,t;
             XQueryPointer(display, _winHdl, &r, &t, &a, &b,
                 &result.x, &result.y, &c);
             return result;
         }
     }

     /// Sets the mouse position from a point.
     void position(T)(Point!T value) const
     if (isNumeric!T)
     {
         version(linux)
         {
             XWarpPointer(display, _winHdl, _winHdl, 0, 0, 0, 0,
                 cast(int) value.x, cast(int) value.y);
         }
         else static assert(0);
     }
}