Golang XUtil.RootWin方法代碼示例

func newWindow(X *xgbutil.XUtil) {
	win, err := xwindow.Generate(X)
	if err != nil {
		log.Fatal(err)
	}
	win.Create(X.RootWin(), 0, 0, 200, 200,
		xproto.CwBackPixel|xproto.CwEventMask,
		0, xproto.EventMaskButtonRelease)
	win.WMGracefulClose(
		func(w *xwindow.Window) {
			xevent.Detach(w.X, w.Id)
			mousebind.Detach(w.X, w.Id)
			w.Destroy()
			xevent.Quit(X)
			Done <- true
		})

	win.Map()

	err = mousebind.ButtonReleaseFun(
		func(X *xgbutil.XUtil, ev xevent.ButtonReleaseEvent) {
			newWindow(X)
		}).Connect(X, win.Id, "1", false, false)

	if err != nil {
		log.Fatal(err)
	}
}

// _NET_DESKTOP_LAYOUT set
func DesktopLayoutSet(xu *xgbutil.XUtil, orientation, columns, rows,
	startingCorner uint) error {

	return xprop.ChangeProp32(xu, xu.RootWin(), "_NET_DESKTOP_LAYOUT",
		"CARDINAL", orientation, columns, rows,
		startingCorner)
}

// RootGeometry gets the geometry of the root window. It will panic on failure.
func RootGeometry(xu *xgbutil.XUtil) xrect.Rect {
	geom, err := RawGeometry(xu, xproto.Drawable(xu.RootWin()))
	if err != nil {
		panic(err)
	}
	return geom
}

// compose a number of rectabgles into a window shape
func ComposeShape(X *xgbutil.XUtil, dst xproto.Window, rects []xrect.Rect) (err error) {

	combine_bounds := make([]shape.CombineCookie, len(rects))
	combine_clip := make([]shape.CombineCookie, len(rects))

	var operation shape.Op

	for i, rect := range rects {
		// make rectangular window of correct goemetry
		win, err := xwindow.Generate(X)
		if err != nil {
			log.Fatalf("ComposeShape: Error creating rectange %v window.", rect)
			return err
		}
		win.Create(X.RootWin(), rect.X(), rect.Y(), rect.Width(), rect.Height(), xproto.CwBackPixel, 0xffffff)

		// choose operation. on the first one, we want to set the shape.
		if i == 0 {
			operation = shape.SoSet
		} else {
			operation = shape.SoUnion
		}

		// combine window request
		x, y := int16(rect.X()), int16(rect.Y())

		combine_kind := shape.Kind(shape.SkBounding)
		combine_bounds[i] = shape.CombineChecked(X.Conn(), operation, combine_kind, combine_kind, dst, x, y, win.Id)
		combine_kind = shape.Kind(shape.SkClip)
		combine_clip[i] = shape.CombineChecked(X.Conn(), operation, combine_kind, combine_kind, dst, x, y, win.Id)
	}
	return nil
}

// New allocates and initializes a new DockApp.  NewDockApp does not initialize
// the window contents and does not map the window to the display screen.  The
// window is mapped to the screen when the Main method is called on the
// returned DockApp.
func New(x *xgbutil.XUtil, rect image.Rectangle) (*DockApp, error) {
	win, err := xwindow.Generate(x)
	if err != nil {
		log.Fatalf("generate window: %v", err)
	}
	win.Create(x.RootWin(), 0, 0, rect.Size().X, rect.Size().Y, 0)

	// Set WM hints so that Openbox puts the window into the dock.
	hints := &icccm.Hints{
		Flags:        icccm.HintState | icccm.HintIconWindow,
		InitialState: icccm.StateWithdrawn,
		IconWindow:   win.Id,
		WindowGroup:  win.Id,
	}
	err = icccm.WmHintsSet(x, win.Id, hints)
	if err != nil {
		win.Destroy()
		return nil, fmt.Errorf("wm hints: %v", err)
	}
	img := xgraphics.New(x, rect)
	err = img.XSurfaceSet(win.Id)
	if err != nil {
		img.Destroy()
		win.Destroy()
		return nil, fmt.Errorf("xsurface set: %v", err)
	}
	app := &DockApp{
		x:   x,
		img: img,
		win: win,
	}
	return app, nil
}

func newParent(X *xgbutil.XUtil, cid xproto.Window) (*Parent, error) {
	parent, err := xwindow.Generate(X)
	if err != nil {
		logger.Error.Printf("Could not create a parent window for client "+
			"with id '%d' because: %s", cid, err)
		logger.Error.Fatalf("In a state where no new windows can be created. " +
			"Unfortunately, we must exit.")
	}

	err = parent.CreateChecked(X.RootWin(), 0, 0, 1, 1,
		xproto.CwEventMask,
		xproto.EventMaskSubstructureRedirect|
			xproto.EventMaskButtonPress|xproto.EventMaskButtonRelease)
	if err != nil {
		return nil, err
	}

	err = xproto.ReparentWindowChecked(X.Conn(),
		cid, parent.Id, 0, 0).Check()
	if err != nil {
		return nil, err
	}

	return &Parent{parent}, nil
}

func newWindow(controlCh *controlCh, X *xgbutil.XUtil, width, height int) *xwindow.Window {
	var (
		err error
		win *xwindow.Window
	)

	win, err = xwindow.Generate(X)
	if err != nil {
		panic(err)
	}

	win.Create(X.RootWin(), 0, 0, width, height,
		xproto.CwBackPixel|xproto.CwEventMask,
		0, xproto.EventMaskButtonRelease)

	// Xorg application exits when the window is closed.
	win.WMGracefulClose(
		func(w *xwindow.Window) {
			xevent.Detach(w.X, w.Id)
			mousebind.Detach(w.X, w.Id)
			w.Destroy()
			xevent.Quit(X)
			controlCh.exit <- true
		})

	// In order to get ConfigureNotify events, we must listen to the window
	// using the 'StructureNotify' mask.
	win.Listen(xproto.EventMaskButtonPress |
		xproto.EventMaskButtonRelease |
		xproto.EventMaskKeyPress |
		xproto.EventMaskKeyRelease |
		xproto.EventMaskStructureNotify)
	win.Map()
	return win
}

// find the EWHM window under the mouse cursor
func FindManagedWindowUnderMouse(X *xgbutil.XUtil) (xproto.Window, error) {
	// construct a hashset of the managed windows
	clients, err := ewmh.ClientListGet(X)
	if err != nil {
		return 0, fmt.Errorf("FindUnderMouse: could not retrieve EWHM client list: %v", err)
	}

	managed := make(map[xproto.Window]bool, len(clients))
	for _, win := range clients {
		managed[win] = true
	}

	cur_window := X.RootWin()

	// descend the QueryTree to the first child that is a EWMH managed window
	for {
		// return the parent if it is an EWHM window
		if _, ok := managed[cur_window]; ok {
			return cur_window, nil
		}

		cur_window, _, err = FindNextUnderMouse(X, cur_window)
		if err != nil {
			break
		}
	}

	// we didn't find the window :(
	return 0, errors.New("FindUnderMouse: no EWMH window found under mouse")
}

func newAudio(Xu *xgbutil.XUtil) (*audio, error) {
	m, err := OpenMixer()
	if err != nil {
		return nil, err
	}
	defer func() {
		// set m to nil on final success
		if m != nil {
			_ = m.Close()
		}
	}()

	a := &audio{
		mixer: m,
	}

	for _, k := range []struct {
		key string
		fn  keybind.KeyPressFun
	}{
		{"XF86AudioRaiseVolume", a.up},
		{"XF86AudioLowerVolume", a.down},
		{"XF86AudioMute", a.mute},
	} {
		if err := k.fn.Connect(Xu, Xu.RootWin(), k.key, true); err != nil {
			return nil, err
		}
	}

	m = nil
	return a, nil
}

func newWindow(X *xgbutil.XUtil, width, height int) *xwindow.Window {
	var (
		err error
		win *xwindow.Window
	)
	win, err = xwindow.Generate(X)
	if err != nil {
		log.Fatal(err)
	}
	win.Create(X.RootWin(), 0, 0, width, height,
		xproto.CwBackPixel|xproto.CwEventMask,
		0, xproto.EventMaskButtonRelease)
	win.WMGracefulClose(
		func(w *xwindow.Window) {
			xevent.Detach(w.X, w.Id)
			mousebind.Detach(w.X, w.Id)
			w.Destroy()
			xevent.Quit(X)
		})

	win.Map()

	if err != nil {
		log.Fatal(err)
	}
	return win
}

// When a cross is declared in its object literal form, it may not have the appropriate window.
// this function creates a new X11 window for the cross with the correct geometry depending
// on its Icon* parameters.
func (c *Cross) CreateWindow(X *xgbutil.XUtil, icons_per_direction int, bg_color uint32) (*xwindow.Window, error) {

	// calculate the dimensions of the spars of our cross +
	// width/height reflect the vertical-orientation rectangle
	width := c.IconMargin*2 + c.IconSize
	// padding between the icons, margin on the edges
	height := c.IconSize*icons_per_direction + c.IconPadding*(icons_per_direction-1) + c.IconMargin*2

	// intitialize a basic window for the cross
	win, err := xwindow.Generate(X)
	if err != nil {
		return nil, err
	}

	win.Create(X.RootWin(), 0, 0, height, height,
		xproto.CwBackPixel|xproto.CwOverrideRedirect, bg_color, 1)

	// the rects we will be adding together to form the shape of the cross
	vert := xrect.New(0, 0, width, height)
	horiz := xrect.New(0, 0, height, width)
	struts := []xrect.Rect{vert, horiz}

	geom, err := win.Geometry()
	if err != nil {
		return nil, err
	}

	// center struts over window
	x, y := util.CenterChild(vert, geom)
	vert.XSet(x)
	vert.YSet(y)
	x, y = util.CenterChild(horiz, geom)
	horiz.XSet(x)
	horiz.YSet(y)

	// build the cross shape from our friendly rectangles
	err = ComposeShape(X, win.Id, struts)
	if err != nil {
		return nil, err
	}

	// add the window to our cross struct
	c.Window = win

	// create icons from our images
	clr := RGB(bg_color)
	if c.imagesToBecomeIcons != nil {
		icons := make(map[string]*Icon, len(c.imagesToBecomeIcons))
		for name, img := range c.imagesToBecomeIcons {
			icon := NewIcon(X, img, win.Id)
			icon.Background = clr
			icons[name] = icon
		}
		c.Icons = icons
	} else {
		return nil, errors.New("Cross: you must create crosses using the NewCross function (this cross has now iconsToBecomeImage)")
	}

	return win, nil
}

func keyHandlers(X *xgbutil.XUtil,
	cycle *prompt.Cycle, items []*prompt.CycleItem) {

	geom := headGeom(X)

	keybind.KeyPressFun(
		func(X *xgbutil.XUtil, ev xevent.KeyPressEvent) {
			shown := cycle.Show(geom, cycleNext, items)
			if !shown {
				log.Fatal("Did not show cycle prompt.")
			}
			cycle.Next()
		}).Connect(X, X.RootWin(), cycleNext, true)
	keybind.KeyPressFun(
		func(X *xgbutil.XUtil, ev xevent.KeyPressEvent) {
			cycle.Next()
		}).Connect(X, cycle.GrabId(), cycleNext, true)

	keybind.KeyPressFun(
		func(X *xgbutil.XUtil, ev xevent.KeyPressEvent) {
			shown := cycle.Show(geom, cyclePrev, items)
			if !shown {
				log.Fatal("Did not show cycle prompt.")
			}
			cycle.Prev()
		}).Connect(X, X.RootWin(), cyclePrev, true)
	keybind.KeyPressFun(
		func(X *xgbutil.XUtil, ev xevent.KeyPressEvent) {
			cycle.Prev()
		}).Connect(X, cycle.GrabId(), cyclePrev, true)
}

func bind(Xu *xgbutil.XUtil, bindings ...binding) error {
	for _, k := range bindings {
		if err := k.fn.Connect(Xu, Xu.RootWin(), k.key, true); err != nil {
			return err
		}
	}
	return nil
}

// sendClientMessages is a goroutine that sends client messages to the root
// window. We then listen to them later as a demonstration of responding to
// X events. (They are sent with SubstructureNotify and SubstructureRedirect
// masks set. So in order to receive them, we'll have to explicitly listen
// to events of that type on the root window.)
func xSource(X *xgbutil.XUtil) {
	i := 1
	for {
		ewmh.ClientEvent(X, X.RootWin(), "NOOP", i)
		i++
		time.Sleep(200 * time.Millisecond)
	}
}

// _NET_DESKTOP_GEOMETRY get
func DesktopGeometryGet(xu *xgbutil.XUtil) (*DesktopGeometry, error) {
	geom, err := xprop.PropValNums(xprop.GetProperty(xu, xu.RootWin(),
		"_NET_DESKTOP_GEOMETRY"))
	if err != nil {
		return nil, err
	}

	return &DesktopGeometry{Width: int(geom[0]), Height: int(geom[1])}, nil
}