ui/app,apps/gophers,apps/hello: accept nil WindowOptions in NewWindow

Signed-off-by: Elias Naur <mail@eliasnaur.com>

ui/app/app.go

@@ -64,7 +64,14 @@ var extraArgs string
 // ignore or adjust them.
 // If the current program is running on iOS and Android,
 // NewWindow the window previously created by the platform.
-func NewWindow(opts WindowOptions) (*Window, error) {
+func NewWindow(opts *WindowOptions) (*Window, error) {
+	if opts == nil {
+		opts = &WindowOptions{
+			Width:  ui.Dp(800),
+			Height: ui.Dp(600),
+			Title:  "Gio program",
+		}
+	}
 	if opts.Width.V <= 0 || opts.Height.V <= 0 {
 		panic("window width and height must be larger than 0")
 	}

ui/app/os_android.go

@@ -381,6 +381,6 @@ func Main() {
 	panic("unreachable")
 }
 
-func createWindow(opts WindowOptions) (*Window, error) {
-	return <- windows, nil
+func createWindow(opts *WindowOptions) (*Window, error) {
+	return <-windows, nil
 }

ui/app/os_ios.go

@@ -235,7 +235,7 @@ func (w *window) setTextInput(s key.TextInputState) {
 	}
 }
 
-func createWindow(opts WindowOptions) (*Window, error) {
+func createWindow(opts *WindowOptions) (*Window, error) {
 	return <-windows, nil
 }
 

ui/app/os_macos.go

@@ -40,7 +40,7 @@ type windowError struct {
 	err    error
 }
 
-var windowOpts = make(chan WindowOptions)
+var windowOpts = make(chan *WindowOptions)
 
 var windows = make(chan windowError)
 
@@ -188,7 +188,7 @@ func gio_onCreate(view C.CFTypeRef) {
 	windows <- windowError{window: ow}
 }
 
-func createWindow(opts WindowOptions) (*Window, error) {
+func createWindow(opts *WindowOptions) (*Window, error) {
 	windowOpts <- opts
 	werr := <-windows
 	return werr.window, werr.err

ui/app/os_wayland.go

@@ -141,7 +141,7 @@ func Main() {
 	<-mainDone
 }
 
-func createWindow(opts WindowOptions) (*Window, error) {
+func createWindow(opts *WindowOptions) (*Window, error) {
 	connMu.Lock()
 	defer connMu.Unlock()
 	if len(winMap) > 0 {
@@ -165,7 +165,7 @@ func createWindow(opts WindowOptions) (*Window, error) {
 	return w.w, nil
 }
 
-func createNativeWindow(opts WindowOptions) (*window, error) {
+func createNativeWindow(opts *WindowOptions) (*window, error) {
 	pipe := make([]int, 2)
 	if err := syscall.Pipe2(pipe, syscall.O_NONBLOCK|syscall.O_CLOEXEC); err != nil {
 		return nil, fmt.Errorf("createNativeWindow: failed to create pipe: %v", err)

ui/app/os_windows.go

@@ -157,7 +157,7 @@ func Main() {
 	<-mainDone
 }
 
-func createWindow(opts WindowOptions) (*Window, error) {
+func createWindow(opts *WindowOptions) (*Window, error) {
 	onceMu.Lock()
 	defer onceMu.Unlock()
 	if len(winMap) > 0 {
@@ -190,7 +190,7 @@ func createWindow(opts WindowOptions) (*Window, error) {
 	return werr.window, werr.err
 }
 
-func createNativeWindow(opts WindowOptions) (*window, error) {
+func createNativeWindow(opts *WindowOptions) (*window, error) {
 	setProcessDPIAware()
 	screenDC, err := getDC(0)
 	if err != nil {