gdk:toplevel-begin-resize (toplevel edge device button x y timestamp)

toplevel -- a gdk:toplevel object
edge -- a gdk:surface-edge value with the edge or corner from which the drag is started
device -- a gdk:device object used for the operation
button -- an integer with the button being used to drag, or 0 for a keyboard-initiated drag
x -- a double float with the surface x coordinate of mouse click that began the drag
y -- a double float with the surface y coordinate of mouse click that began the drag
timestamp -- an unsigned integer with the timestamp of mouse click that began the drag, use the gdk:event-time function.

Begins an interactive resize operation, for a toplevel surface. You might use this function to implement a window resize grip.