// drag around windows with the mouse.
func MakeDraggable(X *xgbutil.XUtil, win xproto.Window) {
	// utility window for movement
	xwin := xwindow.New(X, win)

	// state
	var offsetX, offsetY int
	var lastX, lastY int

	// saves initial click location
	startDrag := func(X *xgbutil.XUtil, rootX, rootY, eventX, eventY int) (bool, xproto.Cursor) {
		offsetX = eventX
		offsetY = eventY
		lastX = rootX
		lastY = rootY

		// apparently the cursor is just ID 0
		return true, 0
	}
	// moves the window
	stepDrag := func(X *xgbutil.XUtil, rootX, rootY, eventX, eventY int) {
		// maintain mouse position within window
		toX := rootX - offsetX
		toY := rootY - offsetY

		// move window
		xwin.Move(toX, toY)
	}
	stopDrag := func(X *xgbutil.XUtil, rx, ry, ex, ey int) {}

	// actually bind handler to window
	mousebind.Drag(X, win, win, "1", true, startDrag, stepDrag, stopDrag)
	log.Printf("MakeDraggable: activated window %v\n", xwin)
}

func (app *RuntimeApp) detachXid(xid xproto.Window) {
	if info, ok := app.xids[xid]; ok {
		xwindow.New(XU, xid).Listen(xproto.EventMaskNoEvent)
		xevent.Detach(XU, xid)

		if len(app.xids) == 1 {
			ENTRY_MANAGER.destroyRuntimeApp(app)
		} else {
			delete(app.xids, xid)
			if info == app.CurrentInfo {
				for _, nextInfo := range app.xids {
					if nextInfo != nil {
						app.CurrentInfo = nextInfo
						app.updateState(app.CurrentInfo.Xid)
						app.notifyChanged()
					} else {
						ENTRY_MANAGER.destroyRuntimeApp(app)
					}
					break
				}
			}
		}
	}
	if len(app.xids) == 0 {
		app.setChangedCB(nil)
	} else {
		app.notifyChanged()
	}
}

func Root() {
	rwin := xwindow.New(X, X.RootWin())
	for _, c := range Clients {
		c.Unfocused()
	}
	rwin.Focus()
}

func (m *TrayManager) addTrayIcon(xid xproto.Window) {
	m.checkValid()
	for _, id := range m.TrayIcons {
		if xproto.Window(id) == xid {
			return
		}
	}

	if d, err := damage.NewDamageId(TrayXU.Conn()); err != nil {
		return
	} else {
		m.dmageInfo[xid] = d
		if err := damage.CreateChecked(TrayXU.Conn(), d, xproto.Drawable(xid), damage.ReportLevelRawRectangles).Check(); err != nil {
			logger.Debug("DamageCreate Failed:", err)
			return
		}
	}
	composite.RedirectWindow(TrayXU.Conn(), xid, composite.RedirectAutomatic)

	m.TrayIcons = append(m.TrayIcons, uint32(xid))
	icon := xwindow.New(TrayXU, xid)
	icon.Listen(xproto.EventMaskVisibilityChange | damage.Notify | xproto.EventMaskStructureNotify)
	icon.Change(xproto.CwBackPixel, 0)

	name, err := ewmh.WmNameGet(TrayXU, xid)
	if err != nil {
		logger.Debug("WmNameGet failed:", err, xid)
	}
	m.nameInfo[xid] = name
	m.notifyInfo[xid] = true
	dbus.Emit(m, "Added", uint32(xid))
	logger.Infof("Added try icon: \"%s\"(%d)", name, uint32(xid))
}

func isWindowOnPrimaryScreen(xid xproto.Window) bool {
	var err error

	win := xwindow.New(XU, xid)
	// include shadow
	gemo, err := win.DecorGeometry()
	if err != nil {
		logger.Debug(err)
		return false
	}

	displayRectX := (int)(displayRect.X)
	displayRectY := (int)(displayRect.Y)
	displayRectWidth := (int)(displayRect.Width)
	displayRectHeight := (int)(displayRect.Height)

	SHADOW_OFFSET := 10
	gemoX := gemo.X() + SHADOW_OFFSET
	gemoY := gemo.Y() + SHADOW_OFFSET
	isOnPrimary := gemoX+SHADOW_OFFSET >= displayRectX &&
		gemoX < displayRectX+displayRectWidth &&
		gemoY >= displayRectY &&
		gemoY < displayRectY+displayRectHeight

	logger.Debugf("isWindowOnPrimaryScreen: %dx%d, %dx%d, %v", gemo.X(),
		gemo.Y(), displayRect.X, displayRect.Y, isOnPrimary)

	return isOnPrimary
}

func isWindowOverlapDock(xid xproto.Window) bool {
	win := xwindow.New(XU, xid)
	rect, err := win.DecorGeometry()
	if err != nil {
		logger.Warning(err)
		return false
	}

	winX := int32(rect.X())
	winY := int32(rect.Y())
	winWidth := int32(rect.Width())
	winHeight := int32(rect.Height())

	dockX := int32(displayRect.X) + (int32(displayRect.Width)-
		dockProperty.PanelWidth)/2
	dockY := int32(displayRect.Y) + int32(displayRect.Height) -
		dockProperty.Height
	dockWidth := int32(displayRect.Width)
	if DisplayModeType(setting.GetDisplayMode()) == DisplayModeModernMode {
		dockWidth = dockProperty.PanelWidth
	}

	// TODO: dock on the other side like top, left.
	return dockY < winY+winHeight &&
		dockX < winX+winWidth && dockX+dockWidth > winX
}

func createNotify(X *xgbutil.XUtil, event xgb.Event) {
	ev := event.(xproto.CreateNotifyEvent)
	// values[0] = XCB_EVENT_MASK_PROPERTY_CHANGE;
	// xcb_change_window_attributes(wm->conn, id, XCB_CW_EVENT_MASK, values);
	win := xwindow.New(X, ev.Window)
	win.Listen(xproto.EventMaskPropertyChange)

	XWins[ev.Window] = &XWin{
		surfaceId: 0,
	}
}

func headGeom(X *xgbutil.XUtil) xrect.Rect {
	if X.ExtInitialized("XINERAMA") {
		heads, err := xinerama.PhysicalHeads(X)
		if err == nil {
			return heads[0]
		}
	}

	geom, err := xwindow.New(X, X.RootWin()).Geometry()
	fatal(err)
	return geom
}

// currentTime forcefully causes a PropertyNotify event to fire on the root
// window, then scans the event queue and picks up the time.
//
// It is NOT SAFE to call this function in a place other than Wingo's
// initialization. Namely, this function subverts xevent's queue and reads
// events directly from X.
func currentTime(X *xgbutil.XUtil) (xproto.Timestamp, error) {
	wmClassAtom, err := xprop.Atm(X, "WM_CLASS")
	if err != nil {
		return 0, err
	}

	stringAtom, err := xprop.Atm(X, "STRING")
	if err != nil {
		return 0, err
	}

	// Make sure we're listening to PropertyChange events on the root window.
	err = xwindow.New(X, X.RootWin()).Listen(xproto.EventMaskPropertyChange)
	if err != nil {
		return 0, fmt.Errorf(
			"Could not listen to Root window events (PropertyChange): %s", err)
	}

	// Do a zero-length append on a property as suggested by ICCCM 2.1.
	err = xproto.ChangePropertyChecked(
		X.Conn(), xproto.PropModeAppend, X.RootWin(),
		wmClassAtom, stringAtom, 8, 0, nil).Check()
	if err != nil {
		return 0, err
	}

	// Now look for the PropertyNotify generated by that zero-length append
	// and return the timestamp attached to that event.
	// Note that we do this outside of xgbutil/xevent, since ownership
	// is literally the first thing we do after connecting to X.
	// (i.e., we don't have our event handling system initialized yet.)
	timeout := time.After(3 * time.Second)
	for {
		select {
		case <-timeout:
			return 0, fmt.Errorf(
				"Expected a PropertyNotify event to get a valid timestamp, " +
					"but never received one.")
		default:
			ev, err := X.Conn().PollForEvent()
			if err != nil {
				continue
			}
			if propNotify, ok := ev.(xproto.PropertyNotifyEvent); ok {
				X.TimeSet(propNotify.Time) // why not?
				return propNotify.Time, nil
			}
			time.Sleep(100 * time.Millisecond)
		}
	}
	panic("unreachable")
}

func NewSocket(X *xgbutil.XUtil, wid xproto.Window) (*XEmbedSocket, error) {
	sock := &XEmbedSocket{
		Window: xwindow.New(X, wid),
		id:     wid,
		X:      X,
	}

	if err := sock.load(); err != nil {
		return nil, err
	}

	return sock, nil
}

func configureRequest(X *xgbutil.XUtil, event xgb.Event) {
	ev := event.(xproto.ConfigureRequestEvent)
	win := xwindow.New(X, ev.Window)

	win.Configure(
		xproto.ConfigWindowX|
			xproto.ConfigWindowY|
			xproto.ConfigWindowWidth|
			xproto.ConfigWindowHeight,
		(int)(ev.X), (int)(ev.Y),
		(int)(ev.Width), (int)(ev.Height),
		ev.Sibling,
		ev.StackMode,
	)
	log.Info("configure request:", ev)
}

func main() {
	X, err := xgbutil.NewConn()
	if err != nil {
		log.Fatal(err)
	}

	// Start generating other source events.
	otherChan := otherSource()

	// Start generating X events (by sending client messages to root window).
	go xSource(X)

	// Listen to those X events.
	xwindow.New(X, X.RootWin()).Listen(xproto.EventMaskSubstructureNotify)

	// Respond to those X events.
	xevent.ClientMessageFun(
		func(X *xgbutil.XUtil, ev xevent.ClientMessageEvent) {
			atmName, err := xprop.AtomName(X, ev.Type)
			if err != nil {
				log.Fatal(err)
			}
			fmt.Printf("ClientMessage: %d. %s\n", ev.Data.Data32[0], atmName)
		}).Connect(X, X.RootWin())

	// Instead of using the usual xevent.Main, we use xevent.MainPing.
	// It runs the main event loop inside a goroutine and returns ping
	// channels, which are sent benign values right before an event is
	// dequeued and right after that event has finished running all callbacks
	// associated with it, respectively.
	pingBefore, pingAfter, pingQuit := xevent.MainPing(X)
	for {
		select {
		case <-pingBefore:
			// Wait for the event to finish processing.
			<-pingAfter
		case otherVal := <-otherChan:
			fmt.Printf("Processing other event: %d\n", otherVal)
		case <-pingQuit:
			fmt.Printf("xevent loop has quit")
			return
		}
	}
}

func (wa *fullScreenWorkaround) start() {
	var runner func()
	runner = func() {
		w, _ := ewmh.ActiveWindowGet(wa.xu)
		wa.detectTarget(w)
		time.AfterFunc(time.Second*5, runner)
	}
	runner()

	root := xwindow.New(wa.xu, wa.xu.RootWin())
	root.Listen(xproto.EventMaskPropertyChange)
	xevent.PropertyNotifyFun(func(XU *xgbutil.XUtil, ev xevent.PropertyNotifyEvent) {
		if wa.activeWindowAtom == ev.Atom {
			w, _ := ewmh.ActiveWindowGet(XU)
			wa.detectTarget(w)
		}
	}).Connect(wa.xu, root.Id)
	xevent.Main(wa.xu)
}

func main() {
	var err error
	X, err = xgbutil.NewConn()
	if err != nil {
		log.Fatal(err)
	}

	clientids, err := ewmh.ClientListGet(X)
	if err != nil {
		log.Fatal(err)
	}

	for _, clientid := range clientids {
		name, err := ewmh.WmNameGet(X, clientid)
		if err != nil {
			continue
		}

		if name == "Super Hexagon" {
			HexWindow = xwindow.New(X, clientid)
			break
		}
	}

	if HexWindow == nil {
		log.Fatal("Couldn't find Super Hexagon window.")
	}

	//Create a window
	DisplayWindow, err = xwindow.Generate(X)
	if err != nil {
		log.Fatalf("Could not generate a new window X id: %s", err)
	}
	dgeom, _ := HexWindow.DecorGeometry()
	DisplayWindow.Create(X.RootWin(), 0, 0, dgeom.Width(), dgeom.Height(), xproto.CwBackPixel, 0)
	DisplayWindow.Map()

	//Start the routine that updates the window
	go updater()

	xevent.Main(X)
}

func getViewport() (geom string) {
	// new X server connection
	X, err := xgbutil.NewConn()
	if err != nil {
		log.Error(err)
	}

	// get root window
	root := xwindow.New(X, X.RootWin())

	// geometry of the root window
	rgeom, err := root.Geometry()
	if err != nil {
		log.Error(err)
	}

	// Get the rectangles for each of the active physical heads.
	// These are returned sorted in order from left to right and then top
	// to bottom.
	// But first check if Xinerama is enabled. If not, use root geometry.
	var heads xinerama.Heads
	if X.ExtInitialized("XINERAMA") {
		heads, err = xinerama.PhysicalHeads(X)
		if err != nil {
			log.Error(err)
		}
	} else {
		heads = xinerama.Heads{rgeom}
	}

	// looking for the first screen, position X: 0, Y: 0
	for _, head := range heads {
		if head.X() == 0 && head.Y() == 0 {
			screenWidth = head.Width()
			screenHeight = head.Height()
		}
	}

	geom = fmt.Sprintf("%dx%d", screenWidth-165, screenHeight-165)

	return geom
}

func (l *Listener) Initialize() error {

	if l.X == nil {
		return fmt.Errorf("X must not be nil.")
	}

	if typeAtom == 0 && typeAtomBegin == 0 {
		var err error

		typeAtom, err = xprop.Atom(l.X, "_NET_STARTUP_INFO", false)
		if err != nil {
			return err
		}

		typeAtomBegin, err = xprop.Atom(l.X, "_NET_STARTUP_INFO_BEGIN", false)
		if err != nil {
			return err
		}
	}

	if l.Callbacks == nil {
		return fmt.Errorf("Callbacks must not be nil")
	}

	if err := xwindow.New(l.X, l.X.RootWin()).Listen(xproto.EventMaskPropertyChange); err != nil {
		return err
	}

	l.msgBuff = make(map[xproto.Window][]byte)

	xevent.HookFun(func(_ *xgbutil.XUtil, ev interface{}) bool {
		return l.hook(ev)
	}).Connect(l.X)

	return nil
}

func newClient(X *xgbutil.XUtil, id xproto.Window) *client {
	X.Grab()
	defer X.Ungrab()

	if client := wingo.findManagedClient(id); client != nil {
		logger.Message.Printf("Already managing client: %s", client)
		return nil
	}

	win := xwindow.New(X, id)
	if _, err := win.Geometry(); err != nil {
		logger.Warning.Printf("Could not manage client %d because: %s", id, err)
		return nil
	}

	c := &client{
		X:           X,
		win:         win,
		name:        "N/A",
		state:       frame.Inactive,
		layer:       stack.LayerDefault,
		maximized:   false,
		iconified:   false,
		unmapIgnore: 0,
		floating:    false,
	}

	c.manage()
	if !c.iconified {
		c.Map()
		if c.primaryType == clientTypeNormal {
			focus.Focus(c)
		}
	}
	return c
}

func main() {
	if flagWriteConfig {
		writeConfigFiles()
		os.Exit(0)
	}

	X, err := xgbutil.NewConn()
	if err != nil {
		logger.Error.Println(err)
		logger.Error.Fatalln("Error connecting to X, quitting...")
	}
	defer X.Conn().Close()

	// Do this first! Attempt to retrieve window manager ownership.
	// This includes waiting for any existing window manager to die.
	// 'own' also sets up handlers for quitting when a window manager tries
	// to replace *us*.
	if err := own(X, flagReplace); err != nil {
		logger.Error.Fatalf(
			"Could not establish window manager ownership: %s", err)
	}

	if len(flagConfigDir) > 0 {
		misc.ConfigPaths.Override = flagConfigDir
	}
	if len(flagDataDir) > 0 {
		misc.DataPaths.Override = flagDataDir
	}
	misc.ReadData()

	keybind.Initialize(X)
	mousebind.Initialize(X)
	focus.Initialize(X)
	stack.Initialize(X)
	cursors.Initialize(X)
	wm.Initialize(X, commands.Env, newHacks())
	hook.Initialize(commands.Env, misc.ConfigFile("hooks.wini"))

	// Listen to Root. It is all-important.
	err = xwindow.New(X, X.RootWin()).Listen(
		xproto.EventMaskPropertyChange |
			xproto.EventMaskFocusChange |
			xproto.EventMaskButtonPress |
			xproto.EventMaskButtonRelease |
			xproto.EventMaskStructureNotify |
			xproto.EventMaskSubstructureNotify |
			xproto.EventMaskSubstructureRedirect)
	if err != nil {
		logger.Error.Fatalf("Could not listen to Root window events: %s", err)
	}

	// Update state when the root window changes size
	wm.RootGeomChangeFun().Connect(X, wm.Root.Id)

	// Oblige map request events
	xevent.MapRequestFun(
		func(X *xgbutil.XUtil, ev xevent.MapRequestEvent) {
			xclient.New(ev.Window)
		}).Connect(X, wm.Root.Id)

	// Oblige configure requests from windows we don't manage.
	xevent.ConfigureRequestFun(
		func(X *xgbutil.XUtil, ev xevent.ConfigureRequestEvent) {
			// Make sure we aren't managing this client.
			if wm.FindManagedClient(ev.Window) != nil {
				return
			}

			xwindow.New(X, ev.Window).Configure(int(ev.ValueMask),
				int(ev.X), int(ev.Y), int(ev.Width), int(ev.Height),
				ev.Sibling, ev.StackMode)
		}).Connect(X, wm.Root.Id)

	xevent.FocusInFun(
		func(X *xgbutil.XUtil, ev xevent.FocusInEvent) {
			if ignoreRootFocus(ev.Mode, ev.Detail) {
				return
			}
			if len(wm.Workspace().Clients) == 0 {
				return
			}
			wm.FocusFallback()
		}).Connect(X, wm.Root.Id)

	// Listen to Root client message events. This is how we handle all
	// of the EWMH bullshit.
	xevent.ClientMessageFun(handleClientMessages).Connect(X, wm.Root.Id)

	// Tell everyone what we support.
	setSupported()

	// Start up the IPC command listener.
	go ipc()

	// Just before starting the main event loop, check to see if there are
	// any clients that already exist that we should manage.
	manageExistingClients()

	// Now make sure that clients are in the appropriate visible state.
	for _, wrk := range wm.Heads.Workspaces.Wrks {
//.........这里部分代码省略.........

func rootInit(X *xgbutil.XUtil) {
	var err error

	// Listen to Root. It is all-important.
	evMasks := xproto.EventMaskPropertyChange |
		xproto.EventMaskFocusChange |
		xproto.EventMaskButtonPress |
		xproto.EventMaskButtonRelease |
		xproto.EventMaskStructureNotify |
		xproto.EventMaskSubstructureNotify |
		xproto.EventMaskSubstructureRedirect
	if wm.Config.FfmHead {
		evMasks |= xproto.EventMaskPointerMotion
	}
	err = xwindow.New(X, X.RootWin()).Listen(evMasks)
	if err != nil {
		logger.Error.Fatalf("Could not listen to Root window events: %s", err)
	}

	// Update state when the root window changes size
	wm.RootGeomChangeFun().Connect(X, wm.Root.Id)

	// Oblige map request events
	xevent.MapRequestFun(
		func(X *xgbutil.XUtil, ev xevent.MapRequestEvent) {
			xclient.New(ev.Window)
		}).Connect(X, wm.Root.Id)

	// Oblige configure requests from windows we don't manage.
	xevent.ConfigureRequestFun(
		func(X *xgbutil.XUtil, ev xevent.ConfigureRequestEvent) {
			// Make sure we aren't managing this client.
			if wm.FindManagedClient(ev.Window) != nil {
				return
			}

			xwindow.New(X, ev.Window).Configure(int(ev.ValueMask),
				int(ev.X), int(ev.Y), int(ev.Width), int(ev.Height),
				ev.Sibling, ev.StackMode)
		}).Connect(X, wm.Root.Id)

	xevent.FocusInFun(
		func(X *xgbutil.XUtil, ev xevent.FocusInEvent) {
			if ignoreRootFocus(ev.Mode, ev.Detail) {
				return
			}
			if len(wm.Workspace().Clients) == 0 {
				return
			}
			wm.FocusFallback()
		}).Connect(X, wm.Root.Id)

	// Listen to Root client message events. This is how we handle all
	// of the EWMH bullshit.
	xevent.ClientMessageFun(handleClientMessages).Connect(X, wm.Root.Id)

	// Check where the pointer is on motion events. If it's crossed a monitor
	// boundary, switch the focus of the head.
	if wm.Config.FfmHead {
		xevent.MotionNotifyFun(handleMotionNotify).Connect(X, wm.Root.Id)
	}
}

func xwmInit(fd uintptr) {

	X := fromFd(fd)
	defer X.Conn().Close()

	root := xwindow.New(X, X.RootWin())

	if _, err := root.Geometry(); err != nil {
		panic(err)
	}

	// if names, _ := ewmh.DesktopNamesGet(X); len(names) > 0 {
	// 	println(names)
	// }

	composite.Init(X.Conn())

	atomNames := []string{
		"WL_SURFACE_ID",
		"WM_DELETE_WINDOW",
		"WM_PROTOCOLS",
		"WM_S0",
		"WM_NORMAL_HINTS",
		"WM_TAKE_FOCUS",
		"WM_STATE",
		"WM_CLIENT_MACHINE",
		"_NET_WM_CM_S0",
		"_NET_WM_NAME",
		"_NET_WM_PID",
		"_NET_WM_ICON",
		"_NET_WM_STATE",
		"_NET_WM_STATE_FULLSCREEN",
		"_NET_WM_USER_TIME",
		"_NET_WM_ICON_NAME",
		"_NET_WM_WINDOW_TYPE",
		"_NET_WM_WINDOW_TYPE_DESKTOP",
		"_NET_WM_WINDOW_TYPE_DOCK",
		"_NET_WM_WINDOW_TYPE_TOOLBAR",
		"_NET_WM_WINDOW_TYPE_MENU",
		"_NET_WM_WINDOW_TYPE_UTILITY",
		"_NET_WM_WINDOW_TYPE_SPLASH",
		"_NET_WM_WINDOW_TYPE_DIALOG",
		"_NET_WM_WINDOW_TYPE_DROPDOWN_MENU",
		"_NET_WM_WINDOW_TYPE_POPUP_MENU",
		"_NET_WM_WINDOW_TYPE_TOOLTIP",
		"_NET_WM_WINDOW_TYPE_NOTIFICATION",
		"_NET_WM_WINDOW_TYPE_COMBO",
		"_NET_WM_WINDOW_TYPE_DND",
		"_NET_WM_WINDOW_TYPE_NORMAL",
		"_NET_WM_MOVERESIZE",
		"_NET_SUPPORTING_WM_CHECK",
		"_NET_SUPPORTED",
		"_MOTIF_WM_HINTS",
		"CLIPBOARD",
		"CLIPBOARD_MANAGER",
		"TARGETS",
		"UTF8_STRING",
		"_WL_SELECTION",
		"INCR",
		"TIMESTAMP",
		"MULTIPLE",
		"UTF8_STRING",
		"COMPOUND_TEXT",
		"TEXT",
		"STRING",
		"text/plain;charset=utf-8",
		"text/plain",
		"XdndSelection",
		"XdndAware",
		"XdndEnter",
		"XdndLeave",
		"XdndDrop",
		"XdndStatus",
		"XdndFinished",
		"XdndTypeList",
		"XdndActionCopy",
	}

	cookies := make([]xproto.InternAtomCookie, len(atomNames))

	for i := 0; i < len(atomNames); i++ {
		cookies[i] = xproto.InternAtom(X.Conn(),
			false, uint16(len(atomNames[i])), atomNames[i])
	}

	/* Try to select for substructure redirect. */
	evMasks := xproto.EventMaskPropertyChange |
		xproto.EventMaskFocusChange |
		xproto.EventMaskButtonPress |
		xproto.EventMaskButtonRelease |
		xproto.EventMaskStructureNotify |
		xproto.EventMaskSubstructureNotify |
		xproto.EventMaskSubstructureRedirect

	root.Listen(evMasks)

	composite.RedirectSubwindows(X.Conn(), root.Id,
		composite.RedirectManual)

	// change config
//.........这里部分代码省略.........