gdk:window-begin-move-drag-for-device (window device button xroot yroot timestamp)

window -- a toplevel gdk:window object
device -- a gdk:device object used for the operation
button -- an integer with the button being used to drag
xroot -- an integer with the root window x coordinate of mouse click that began the drag
yroot -- an integer with the root window y coordinate of mouse click that began the drag
timestamp -- an unsigned integer with the timestamp of mouse click that began the drag

Begins a window move operation for a toplevel window. You might use this function to implement a "window move grip", for example. The function works best with window managers that support the Extended Window Manager Hints, but has a fallback implementation for other window managers.