func (ms Monitors) Init(e *Euclid, x XHandle) (bool, bool) {
var rr, xn bool
c := x.Conn()
err := randr.Init(c)
if err == nil && ms.Update(e, x, false, false, false) {
rr = true
randr.SelectInputChecked(c, x.Root(), randr.NotifyMaskScreenChange)
} else {
rr = false
err = xinerama.Init(c)
if err == nil {
xia, err := xinerama.IsActive(c).Reply()
if xia != nil && err == nil {
xn = true
xsq, _ := xinerama.QueryScreens(c).Reply()
xsi := xsq.ScreenInfo
for i := 0; i < len(xsi); i++ {
info := xsi[i]
rect := xproto.Rectangle{info.XOrg, info.YOrg, info.Width, info.Height}
ms.Add(e, x, rect)
}
} else {
s := x.Screen()
rect := xproto.Rectangle{0, 0, s.WidthInPixels, s.HeightInPixels}
ms.Add(e, x, rect)
}
}
}
return rr, xn
}
func subscribeXEvents(ch chan<- Event, done <-chan struct{}) {
X, err := xgb.NewConn()
if err != nil {
ch <- Event{Error: err}
return
}
defer X.Close()
if err = randr.Init(X); err != nil {
ch <- Event{Error: err}
return
}
root := xproto.Setup(X).DefaultScreen(X).Root
eventMask := randr.NotifyMaskScreenChange |
randr.NotifyMaskCrtcChange |
randr.NotifyMaskOutputChange |
randr.NotifyMaskOutputProperty
err = randr.SelectInputChecked(X, root, uint16(eventMask)).Check()
if err != nil {
ch <- Event{Error: err}
return
}
for {
ev, err := X.WaitForEvent()
select {
case ch <- Event{Event: ev, Error: err}:
case <-time.After(eventSendTimeout):
continue
case <-done:
return
}
if err != nil {
log.Fatal(err)
}
}
}
func main() {
X, _ := xgb.NewConn()
// Every extension must be initialized before it can be used.
err := randr.Init(X)
if err != nil {
log.Fatal(err)
}
// Get the root window on the default screen.
root := xproto.Setup(X).DefaultScreen(X).Root
// Gets the current screen resources. Screen resources contains a list
// of names, crtcs, outputs and modes, among other things.
resources, err := randr.GetScreenResources(X, root).Reply()
if err != nil {
log.Fatal(err)
}
// Iterate through all of the outputs and show some of their info.
for _, output := range resources.Outputs {
info, err := randr.GetOutputInfo(X, output, 0).Reply()
if err != nil {
log.Fatal(err)
}
bestMode := info.Modes[0]
for _, mode := range resources.Modes {
if mode.Id == uint32(bestMode) {
fmt.Printf("Width: %d, Height: %d\n", mode.Width, mode.Height)
}
}
}
fmt.Println("\n")
// Iterate through all of the crtcs and show some of their info.
for _, crtc := range resources.Crtcs {
info, err := randr.GetCrtcInfo(X, crtc, 0).Reply()
if err != nil {
log.Fatal(err)
}
fmt.Printf("X: %d, Y: %d, Width: %d, Height: %d\n",
info.X, info.Y, info.Width, info.Height)
}
// Tell RandR to send us events. (I think these are all of them, as of 1.3.)
err = randr.SelectInputChecked(X, root,
randr.NotifyMaskScreenChange|
randr.NotifyMaskCrtcChange|
randr.NotifyMaskOutputChange|
randr.NotifyMaskOutputProperty).Check()
if err != nil {
log.Fatal(err)
}
// Listen to events and just dump them to standard out.
// A more involved approach will have to read the 'U' field of
// RandrNotifyEvent, which is a union (really a struct) of type
// RanrNotifyDataUnion.
for {
ev, err := X.WaitForEvent()
if err != nil {
log.Fatal(err)
}
fmt.Println(ev)
}
}