func main() { X, err := xgbutil.NewConn() if err != nil { log.Fatal(err) } // Create window for receiving compressed MotionNotify events. cwin := newWindow(X, 0x00ff00) // Attach event handler for MotionNotify that compresses events. xevent.MotionNotifyFun( func(X *xgbutil.XUtil, ev xevent.MotionNotifyEvent) { ev = compressMotionNotify(X, ev) fmt.Printf("COMPRESSED: (EventX %d, EventY %d)\n", ev.EventX, ev.EventY) time.Sleep(workTime) }).Connect(X, cwin.Id) // Create window for receiving uncompressed MotionNotify events. uwin := newWindow(X, 0xff0000) // Attach event handler for MotionNotify that does not compress events. xevent.MotionNotifyFun( func(X *xgbutil.XUtil, ev xevent.MotionNotifyEvent) { fmt.Printf("UNCOMPRESSED: (EventX %d, EventY %d)\n", ev.EventX, ev.EventY) time.Sleep(workTime) }).Connect(X, uwin.Id) xevent.Main(X) }
// Drag is the public interface that will make the appropriate connections // to register a drag event for three functions: the begin function, the // step function and the end function. // The 'grabwin' is the window that the grab is placed on (and therefore the // window where all button events are redirected to after the drag has started), // and the 'win' is the window that the initial 'begin' callback is set on. // In typical use cases, these windows should be the same. // If 'grab' is false, then no pointer grab is issued. func Drag(xu *xgbutil.XUtil, grabwin xproto.Window, win xproto.Window, buttonStr string, grab bool, begin xgbutil.MouseDragBeginFun, step xgbutil.MouseDragFun, end xgbutil.MouseDragFun) { ButtonPressFun( func(xu *xgbutil.XUtil, ev xevent.ButtonPressEvent) { dragBegin(xu, ev, grabwin, win, begin, step, end) }).Connect(xu, win, buttonStr, false, grab) // If the grab win isn't the dummy, then setup event handlers for the // grab window. if grabwin != xu.Dummy() { xevent.MotionNotifyFun(dragStep).Connect(xu, grabwin) xevent.ButtonReleaseFun(dragEnd).Connect(xu, grabwin) } }
// Initialize attaches the appropriate callbacks to make mouse bindings easier. // i.e., prep the dummy window to handle mouse dragging events func Initialize(xu *xgbutil.XUtil) { xevent.MotionNotifyFun(dragStep).Connect(xu, xu.Dummy()) xevent.ButtonReleaseFun(dragEnd).Connect(xu, xu.Dummy()) }