// newWindow creates a new window with a random background color. It sets the
// WM_PROTOCOLS property to contain the WM_DELETE_WINDOW atom. It also sets
// up a ClientMessage event handler so that we know when to destroy the window.
// We also set up a mouse binding so that clicking inside a window will
// create another one.
func newWindow(X *xgbutil.XUtil) {
counter++
win, err := xwindow.Generate(X)
if err != nil {
log.Fatal(err)
}
// Get a random background color, create the window (ask to receive button
// release events while we're at it) and map the window.
bgColor := rand.Intn(0xffffff + 1)
win.Create(X.RootWin(), 0, 0, 200, 200,
xproto.CwBackPixel|xproto.CwEventMask,
uint32(bgColor), xproto.EventMaskButtonRelease)
// WMGracefulClose does all of the work for us. It sets the appropriate
// values for WM_PROTOCOLS, and listens for ClientMessages that implement
// the WM_DELETE_WINDOW protocol. When one is found, the provided callback
// is executed.
win.WMGracefulClose(
func(w *xwindow.Window) {
// Detach all event handlers.
// This should always be done when a window can no longer
// receive events.
xevent.Detach(w.X, w.Id)
mousebind.Detach(w.X, w.Id)
w.Destroy()
// Exit if there are no more windows left.
counter--
if counter == 0 {
os.Exit(0)
}
})
// It's important that the map comes after setting WMGracefulClose, since
// the WM isn't obliged to watch updates to the WM_PROTOCOLS property.
win.Map()
// A mouse binding so that a left click will spawn a new window.
// Note that we don't issue a grab here. Typically, window managers will
// grab a button press on the client window (which usually activates the
// window), so that we'd end up competing with the window manager if we
// tried to grab it.
// Instead, we set a ButtonRelease mask when creating the window and attach
// a mouse binding *without* a grab.
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)
}
}
func NewWindow(width, height int) (wde.Window, error) {
var err error
w := new(Window)
w.width, w.height = width, height
w.xu, err = xgbutil.NewConn()
if err != nil {
return nil, err
}
w.conn = w.xu.Conn()
screen := w.xu.Screen()
w.win, err = xwindow.Generate(w.xu)
if err != nil {
return nil, err
}
err = w.win.CreateChecked(screen.Root, 600, 500, width, height, 0)
if err != nil {
return nil, err
}
w.win.Listen(AllEventsMask)
err = icccm.WmProtocolsSet(w.xu, w.win.Id, []string{"WM_DELETE_WINDOW"})
if err != nil {
fmt.Println(err)
err = nil
}
w.bufferLck = &sync.Mutex{}
w.buffer = xgraphics.New(w.xu, image.Rect(0, 0, width, height))
w.buffer.XSurfaceSet(w.win.Id)
keyMap, modMap := keybind.MapsGet(w.xu)
keybind.KeyMapSet(w.xu, keyMap)
keybind.ModMapSet(w.xu, modMap)
w.events = make(chan interface{})
w.SetIcon(Gordon)
w.SetIconName("Go")
go w.handleEvents()
return w, nil
}
// newWindow creates a new window that listens to MotionNotify events with
// the given backgroundcolor.
func newWindow(X *xgbutil.XUtil, color uint32) *xwindow.Window {
win, err := xwindow.Generate(X)
if err != nil {
log.Fatal(err)
}
err = win.CreateChecked(X.RootWin(), 0, 0, 400, 400,
xproto.CwBackPixel|xproto.CwEventMask,
color, xproto.EventMaskPointerMotion)
if err != nil {
log.Fatal(err)
}
win.Map()
return win
}
func main() {
X, err := xgbutil.NewConn()
if err != nil {
log.Fatal(err)
}
// Create the cursor. You can find a list of available cursors in
// xcursor/cursordef.go.
// We'll make an umbrella here, with an orange foreground and a blue
// background. (The background it typically the outline of the cursor.)
// Note that each component of the RGB color is a 16 bit color. I think
// using the most significant byte to specify each component is good
// enough.
cursor, err := xcursor.CreateCursorExtra(X, xcursor.Umbrella,
0xff00, 0x5500, 0x0000,
0x3300, 0x6600, 0xff00)
if err != nil {
log.Fatal(err)
}
// Create a new window. In the create window request, we'll set the
// background color and set the cursor we created above.
// This results in changing the cursor only when it moves into this window.
win, err := xwindow.Generate(X)
if err != nil {
log.Fatal(err)
}
win.Create(X.RootWin(), 0, 0, 500, 500,
xproto.CwBackPixel|xproto.CwCursor,
0xffffffff, uint32(cursor))
win.Map()
// We can free the cursor now that we've set it.
// If you plan on using this cursor again, then it shouldn't be freed.
// (i.e., if you try to free this before setting it as the cursor in a
// window, you'll get a BadCursor error when trying to use it.)
xproto.FreeCursor(X.Conn(), cursor)
// Block. No need to process any events.
select {}
}