// Refreshes the internal cache of properties.
//
// NOTE: you do not have to call this, unless you want a more up-to-date value
// set than when you first created it with New -- or the last Refresh call.
func (xs *XSettings) Refresh() error {
xs.props = make(map[string]*XSetting)
gso := xproto.GetSelectionOwner(xs.X.Conn(), atomXSettings)
reply, err := gso.Reply()
if err != nil {
return err
}
prop, err := xprop.GetProperty(xs.X, reply.Owner, "_XSETTINGS_SETTINGS")
if err != nil {
return err
}
data := bytes.NewReader(prop.Value)
var endian binary.ByteOrder
var tmp byte
if tmp, err = data.ReadByte(); err != nil {
return err
}
if tmp == 0 {
endian = binary.LittleEndian
} else {
endian = binary.BigEndian
}
buff := make([]byte, 3, 3)
if n, err := data.Read(buff); n != 3 || err != nil {
return err
}
if err = binary.Read(data, endian, &xs.Serial); err != nil {
return err
}
var num uint32
if err = binary.Read(data, endian, &num); err != nil {
return err
}
for i := uint32(0); i < num; i++ {
setting, name, err := xs.readSetting(data, endian)
if err != nil {
return err
}
xs.props[name] = setting
}
return nil
}
// own requests ownership over the role of window manager in the current
// X environment. It can fail if it does not successfully get ownership.
//
// When 'replace' is true, Wingo will attempt to replace an window manager
// that is currently running. Otherwise, Wingo will quit if a window manager
// is running.
func own(X *xgbutil.XUtil, replace bool) error {
otherWmRunning := false
otherWmName := ""
otherWmOwner := xproto.Window(xproto.WindowNone)
xTime, err := currentTime(X)
if err != nil {
return err
}
selAtom, err := managerAtom(X)
if err != nil {
return err
}
// Check to see if we need to replace. If so, determine whether to
// continue based on `replace`.
reply, err := xproto.GetSelectionOwner(X.Conn(), selAtom).Reply()
if err != nil {
return err
}
if reply.Owner != xproto.WindowNone {
otherWmRunning = true
otherWmOwner = reply.Owner
// Look for the window manager's name for a nicer error message.
otherWmName, err = ewmh.GetEwmhWM(X)
if err != nil || len(otherWmName) == 0 {
otherWmName = "Unknown"
}
// We need to listen for DestroyNotify events on the selection
// owner in case we need to replace the WM.
owner := xwindow.New(X, reply.Owner)
if err = owner.Listen(xproto.EventMaskStructureNotify); err != nil {
return err
}
}
if otherWmRunning {
if !replace {
return fmt.Errorf(
"Another window manager (%s) is already running. Please use "+
"the '--replace' option to replace the current window "+
"manager with Wingo.", otherWmName)
} else {
logger.Message.Printf(
"Waiting for %s to shutdown and transfer ownership to us.",
otherWmName)
}
}
logger.Message.Printf("Setting selection owner...")
err = xproto.SetSelectionOwnerChecked(
X.Conn(), X.Dummy(), selAtom, xTime).Check()
if err != nil {
return err
}
// Now we've got to make sure that we *actually* got ownership.
logger.Message.Printf("Getting selection owner...")
reply, err = xproto.GetSelectionOwner(X.Conn(), selAtom).Reply()
if err != nil {
return err
}
if reply.Owner != X.Dummy() {
return fmt.Errorf(
"Could not acquire ownership with SetSelectionOwner. "+
"GetSelectionOwner claims that '%d' is the owner, but '%d' "+
"needs to be.", reply.Owner, X.Dummy())
}
// While X now acknowledges us as the selection owner, it's possible
// that the window manager is misbehaving. ICCCM 2.8 calls for the previous
// manager to destroy the selection owner when it's OK for us to take
// over. Otherwise, listening to SubstructureRedirect on the root window
// might fail if we move too quickly.
timeout := time.After(3 * time.Second)
if otherWmRunning {
OTHER_WM_SHUTDOWN:
for {
select {
case <-timeout:
return fmt.Errorf(
"Wingo failed to replace the currently running window "+
"manager (%s). Namely, Wingo was not able to detect "+
"that the current window manager had shut down.",
otherWmName)
default:
logger.Message.Printf("Polling for event...")
ev, err := X.Conn().PollForEvent()
if err != nil {
continue
}
logger.Message.Printf("Got event, error: %s -- %s", ev, err)
if destNotify, ok := ev.(xproto.DestroyNotifyEvent); ok {
if destNotify.Window == otherWmOwner {
break OTHER_WM_SHUTDOWN
}
}
time.Sleep(100 * time.Millisecond)
}
}
}
logger.Message.Println("Wingo has window manager ownership!")
announce(X)
// Listen for SelectionClear events. When we get one of these, then we
// know a window manager is trying to replace us.
xevent.SelectionClearFun(disown).Connect(X, X.Dummy())
return nil
}
func New(X *xgbutil.XUtil) (*SystemTray, error) {
tray := &SystemTray{
X: X,
}
var err error
if sysTrayAtom == 0 {
sysTrayAtom, err = xprop.Atom(X, "_NET_SYSTEM_TRAY_S0", false)
if err != nil {
return nil, err
}
}
if sysTrayMsgAtom == 0 {
sysTrayMsgAtom, err = xprop.Atom(X, "_NET_SYSTEM_TRAY_OPCODE", false)
if err != nil {
return nil, err
}
}
if managerEventAtom == 0 {
managerEventAtom, err = xprop.Atom(X, "MANAGER", false)
if err != nil {
return nil, err
}
}
tray.wid, err = xwindow.Create(X, X.RootWin())
if err != nil {
return nil, err
}
ts, err := currentTime(X)
if err != nil {
return nil, err
}
X.TimeSet(ts)
// tray.wid.Listen(xproto.EventMaskNoEvent | xproto.EventMaskPropertyChange)
err = xproto.SetSelectionOwnerChecked(tray.X.Conn(), tray.wid.Id, sysTrayAtom, tray.X.TimeGet()).Check()
if err != nil {
return nil, err
}
reply, err := xproto.GetSelectionOwner(X.Conn(), sysTrayAtom).Reply()
if err != nil {
return nil, err
}
if reply.Owner != tray.wid.Id {
return nil, fmt.Errorf("Could not get ownership of the thingy-thing.")
}
evt, err := xevent.NewClientMessage(32, X.RootWin(), managerEventAtom,
int(X.TimeGet()), int(sysTrayAtom), int(tray.wid.Id))
if err != nil {
return nil, err
}
if err = xevent.SendRootEvent(X, evt, xproto.EventMaskStructureNotify); err != nil {
return nil, err
}
xevent.ClientMessageFun(func(_ *xgbutil.XUtil, ev xevent.ClientMessageEvent) {
tray.event(ev)
}).Connect(tray.X, tray.wid.Id)
return tray, nil
}
func (m *TrayManager) getSelectionOwner() (*xproto.GetSelectionOwnerReply, error) {
_trayInstance := xproto.GetSelectionOwner(TrayXU.Conn(), _NET_SYSTEM_TRAY_S0)
return _trayInstance.Reply()
}