app,internal/window: extract native window code to separate package

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

app/app.go

@@ -3,37 +3,10 @@
 package app
 
 import (
-	"errors"
-	"math"
 	"os"
 	"strings"
-	"time"
 
-	"gioui.org/unit"
-)
-
-type windowRendezvous struct {
-	in   chan windowAndOptions
-	out  chan windowAndOptions
-	errs chan error
-}
-
-type windowAndOptions struct {
-	window *Window
-	opts   *windowOptions
-}
-
-const (
-	inchPrDp = 1.0 / 160
-	mmPrDp   = 25.4 / 160
-	// monitorScale is the extra scale applied to
-	// monitor outputs to compensate for the extra
-	// viewing distance compared to phone and tables.
-	monitorScale = 1.20
-	// minDensity is the minimum pixels per dp to
-	// ensure font and ui legibility on low-dpi
-	// screens.
-	minDensity = 1.25
+	"gioui.org/app/internal/window"
 )
 
 // extraArgs contains extra arguments to append to
@@ -69,59 +42,5 @@ func DataDir() (string, error) {
 // require control of the main thread of the program for
 // running windows.
 func Main() {
-	main()
-}
-
-// config implements the system.Config interface.
-type config struct {
-	// Device pixels per dp.
-	pxPerDp float32
-	// Device pixels per sp.
-	pxPerSp float32
-	now     time.Time
-}
-
-func (c *config) Now() time.Time {
-	return c.now
-}
-
-func (c *config) Px(v unit.Value) int {
-	var r float32
-	switch v.U {
-	case unit.UnitPx:
-		r = v.V
-	case unit.UnitDp:
-		r = c.pxPerDp * v.V
-	case unit.UnitSp:
-		r = c.pxPerSp * v.V
-	default:
-		panic("unknown unit")
-	}
-	return int(math.Round(float64(r)))
-}
-
-func newWindowRendezvous() *windowRendezvous {
-	wr := &windowRendezvous{
-		in:   make(chan windowAndOptions),
-		out:  make(chan windowAndOptions),
-		errs: make(chan error),
-	}
-	go func() {
-		var main windowAndOptions
-		var out chan windowAndOptions
-		for {
-			select {
-			case w := <-wr.in:
-				var err error
-				if main.window != nil {
-					err = errors.New("multiple windows are not supported")
-				}
-				wr.errs <- err
-				main = w
-				out = wr.out
-			case out <- main:
-			}
-		}
-	}()
-	return wr
+	window.Main()
 }

app/datadir_android.go

@@ -5,21 +5,21 @@
 package app
 
 import "C"
-import "sync"
+
+import (
+	"sync"
+
+	"gioui.org/app/internal/window"
+)
 
 var (
 	dataDirOnce sync.Once
-	dataDirChan = make(chan string, 1)
 	dataPath    string
 )
 
 func dataDir() (string, error) {
 	dataDirOnce.Do(func() {
-		dataPath = <-dataDirChan
+		dataPath = window.GetDataDir()
 	})
 	return dataPath, nil
 }
-
-func setDataDir(dir string) {
-	dataDirChan <- dir
-}

app/internal/window/egl.go

@@ -2,7 +2,7 @@
 
 // +build linux windows
 
-package app
+package window
 
 import (
 	"errors"

app/internal/window/egl_android.go

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: Unlicense OR MIT
 
-package app
+package window
 
 /*
 #include <EGL/egl.h>

app/internal/window/egl_linux.go

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: Unlicense OR MIT
 
-package app
+package window
 
 /*
 #cgo LDFLAGS: -lEGL
@@ -13,6 +13,8 @@ package app
 */
 import "C"
 
+import "gioui.org/app/internal/gl"
+
 type (
 	_EGLint               = C.EGLint
 	_EGLDisplay           = C.EGLDisplay
@@ -93,3 +95,7 @@ func eglCreateWindowSurface(disp _EGLDisplay, conf _EGLConfig, win _EGLNativeWin
 	eglSurf := C.eglCreateWindowSurface(disp, conf, win, &attribs[0])
 	return eglSurf
 }
+
+func (w *window) NewContext() (gl.Context, error) {
+	return newContext(w)
+}

app/internal/window/egl_wayland.go

@@ -2,7 +2,7 @@
 
 // +build linux,!android
 
-package app
+package window
 
 import (
 	"errors"

app/internal/window/egl_windows.go

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: Unlicense OR MIT
 
-package app
+package window
 
 import (
 	"os"
@@ -154,3 +154,7 @@ func (w *window) eglWindow(visID int) (_EGLNativeWindowType, int, int, error) {
 	hwnd, width, height := w.HWND()
 	return _EGLNativeWindowType(hwnd), width, height, nil
 }
+
+func (w *window) NewContext() (gl.Context, error) {
+	return newContext(w)
+}

app/internal/window/gl_ios.go

@@ -2,7 +2,7 @@
 
 // +build darwin,ios
 
-package app
+package window
 
 /*
 #cgo CFLAGS: -fmodules -fobjc-arc -x objective-c
@@ -122,3 +122,7 @@ func (c *context) MakeCurrent() error {
 	}
 	return nil
 }
+
+func (w *window) NewContext() (gl.Context, error) {
+	return newContext(w)
+}

app/internal/window/gl_js.go

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: Unlicense OR MIT
 
-package app
+package window
 
 import (
 	"errors"
@@ -89,3 +89,7 @@ func (c *context) MakeCurrent() error {
 	}
 	return nil
 }
+
+func (w *window) NewContext() (gl.Context, error) {
+	return newContext(w)
+}

app/internal/window/gl_macos.go

@@ -2,7 +2,7 @@
 
 // +build darwin,!ios
 
-package app
+package window
 
 import (
 	"gioui.org/app/internal/gl"
@@ -72,3 +72,7 @@ func (c *context) MakeCurrent() error {
 	C.gio_makeCurrentContext(c.ctx)
 	return nil
 }
+
+func (w *window) NewContext() (gl.Context, error) {
+	return newContext(w)
+}

app/internal/window/os_android.go

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: Unlicense OR MIT
 
-package app
+package window
 
 /*
 #cgo LDFLAGS: -landroid
@@ -32,7 +32,7 @@ import (
 )
 
 type window struct {
-	*Window
+	callbacks Callbacks
 
 	view C.jobject
 
@@ -55,6 +55,8 @@ type window struct {
 	mpostFrameCallbackOnMainThread C.jmethodID
 }
 
+var dataDirChan = make(chan string, 1)
+
 var theJVM *C.JavaVM
 
 var views = make(map[C.jlong]*window)
@@ -85,11 +87,15 @@ func runGoMain(env *C.JNIEnv, class C.jclass, jdataDir C.jbyteArray) {
 	}
 	n := C.gio_jni_GetArrayLength(env, jdataDir)
 	dataDir := C.GoStringN((*C.char)(unsafe.Pointer(dirBytes)), n)
-	setDataDir(dataDir)
+	dataDirChan <- dataDir
 	C.gio_jni_ReleaseByteArrayElements(env, jdataDir, dirBytes)
 	runMain()
 }
 
+func GetDataDir() string {
+	return <-dataDirChan
+}
+
 //export setJVM
 func setJVM(vm *C.JavaVM) {
 	theJVM = vm
@@ -108,8 +114,8 @@ func onCreateView(env *C.JNIEnv, class C.jclass, view C.jobject) C.jlong {
 		mpostFrameCallbackOnMainThread: jniGetMethodID(env, class, "postFrameCallbackOnMainThread", "()V"),
 	}
 	wopts := <-mainWindow.out
-	w.Window = wopts.window
-	w.Window.setDriver(w)
+	w.callbacks = wopts.window
+	w.callbacks.SetDriver(w)
 	handle := C.jlong(view)
 	views[handle] = w
 	w.loadConfig(env, class)
@@ -120,7 +126,7 @@ func onCreateView(env *C.JNIEnv, class C.jclass, view C.jobject) C.jlong {
 //export onDestroyView
 func onDestroyView(env *C.JNIEnv, class C.jclass, handle C.jlong) {
 	w := views[handle]
-	w.setDriver(nil)
+	w.callbacks.SetDriver(nil)
 	delete(views, handle)
 	C.gio_jni_DeleteGlobalRef(env, w.view)
 	w.view = 0
@@ -201,7 +207,7 @@ func onFrameCallback(env *C.JNIEnv, class C.jclass, view C.jlong, nanos C.jlong)
 func onBack(env *C.JNIEnv, class C.jclass, view C.jlong) C.jboolean {
 	w := views[view]
 	ev := &system.CommandEvent{Type: system.CommandBack}
-	w.event(ev)
+	w.callbacks.Event(ev)
 	if ev.Cancel {
 		return C.JNI_TRUE
 	}
@@ -211,7 +217,7 @@ func onBack(env *C.JNIEnv, class C.jclass, view C.jlong) C.jboolean {
 //export onFocusChange
 func onFocusChange(env *C.JNIEnv, class C.jclass, view C.jlong, focus C.jboolean) {
 	w := views[view]
-	w.event(key.FocusEvent{Focus: focus == C.JNI_TRUE})
+	w.callbacks.Event(key.FocusEvent{Focus: focus == C.JNI_TRUE})
 }
 
 //export onWindowInsets
@@ -243,7 +249,7 @@ func (w *window) setStage(stage system.Stage) {
 		return
 	}
 	w.stage = stage
-	w.event(system.StageEvent{stage})
+	w.callbacks.Event(system.StageEvent{stage})
 }
 
 func (w *window) nativeWindow(visID int) (*C.ANativeWindow, int, int) {
@@ -279,7 +285,7 @@ func (w *window) loadConfig(env *C.JNIEnv, class C.jclass) {
 	}
 }
 
-func (w *window) setAnimating(anim bool) {
+func (w *window) SetAnimating(anim bool) {
 	w.mu.Lock()
 	w.animating = anim
 	w.mu.Unlock()
@@ -297,7 +303,7 @@ func (w *window) draw(sync bool) {
 		return
 	}
 	ppdp := float32(w.dpi) * inchPrDp
-	w.event(frameEvent{
+	w.callbacks.Event(FrameEvent{
 		FrameEvent: system.FrameEvent{
 			Size: image.Point{
 				X: int(width),
@@ -310,7 +316,7 @@ func (w *window) draw(sync bool) {
 				now:     time.Now(),
 			},
 		},
-		sync: sync,
+		Sync: sync,
 	})
 }
 
@@ -364,10 +370,10 @@ func convertKeyCode(code C.jint) (rune, bool) {
 func onKeyEvent(env *C.JNIEnv, class C.jclass, handle C.jlong, keyCode, r C.jint, t C.jlong) {
 	w := views[handle]
 	if n, ok := convertKeyCode(keyCode); ok {
-		w.event(key.Event{Name: n})
+		w.callbacks.Event(key.Event{Name: n})
 	}
 	if r != 0 {
-		w.event(key.EditEvent{Text: string(rune(r))})
+		w.callbacks.Event(key.EditEvent{Text: string(rune(r))})
 	}
 }
 
@@ -396,7 +402,7 @@ func onTouchEvent(env *C.JNIEnv, class C.jclass, handle C.jlong, action, pointer
 	default:
 		return
 	}
-	w.event(pointer.Event{
+	w.callbacks.Event(pointer.Event{
 		Type:      typ,
 		Source:    src,
 		PointerID: pointer.ID(pointerID),
@@ -405,7 +411,7 @@ func onTouchEvent(env *C.JNIEnv, class C.jclass, handle C.jlong, action, pointer
 	})
 }
 
-func (w *window) showTextInput(show bool) {
+func (w *window) ShowTextInput(show bool) {
 	if w.view == 0 {
 		return
 	}
@@ -418,10 +424,10 @@ func (w *window) showTextInput(show bool) {
 	})
 }
 
-func main() {
+func Main() {
 }
 
-func createWindow(window *Window, opts *windowOptions) error {
+func NewWindow(window Callbacks, opts *Options) error {
 	mainWindow.in <- windowAndOptions{window, opts}
 	return <-mainWindow.errs
 }

app/internal/window/os_ios.go

@@ -2,7 +2,7 @@
 
 // +build darwin,ios
 
-package app
+package window
 
 /*
 #cgo CFLAGS: -fmodules -fobjc-arc -x objective-c
@@ -31,7 +31,7 @@ import (
 
 type window struct {
 	view C.CFTypeRef
-	w    *Window
+	w    Callbacks
 
 	layer   C.CFTypeRef
 	visible atomic.Value
@@ -57,12 +57,12 @@ func onCreate(view C.CFTypeRef) {
 	}
 	wopts := <-mainWindow.out
 	w.w = wopts.window
-	w.w.setDriver(w)
+	w.w.SetDriver(w)
 	w.visible.Store(false)
 	w.layer = C.CFTypeRef(layerFactory())
 	C.gio_addLayerToView(view, w.layer)
 	views[view] = w
-	w.w.event(system.StageEvent{Stage: system.StagePaused})
+	w.w.Event(system.StageEvent{Stage: system.StagePaused})
 }
 
 //export onDraw
@@ -75,13 +75,13 @@ func onDraw(view C.CFTypeRef, dpi, sdpi, width, height C.CGFloat, sync C.int, to
 	w.visible.Store(true)
 	C.gio_updateView(view, w.layer)
 	if !wasVisible {
-		w.w.event(system.StageEvent{Stage: system.StageRunning})
+		w.w.Event(system.StageEvent{Stage: system.StageRunning})
 	}
 	isSync := false
 	if sync != 0 {
 		isSync = true
 	}
-	w.w.event(frameEvent{
+	w.w.Event(FrameEvent{
 		FrameEvent: system.FrameEvent{
 			Size: image.Point{
 				X: int(width + .5),
@@ -99,7 +99,7 @@ func onDraw(view C.CFTypeRef, dpi, sdpi, width, height C.CGFloat, sync C.int, to
 				now:     time.Now(),
 			},
 		},
-		sync: isSync,
+		Sync: isSync,
 	})
 }
 
@@ -107,14 +107,14 @@ func onDraw(view C.CFTypeRef, dpi, sdpi, width, height C.CGFloat, sync C.int, to
 func onStop(view C.CFTypeRef) {
 	w := views[view]
 	w.visible.Store(false)
-	w.w.event(system.StageEvent{Stage: system.StagePaused})
+	w.w.Event(system.StageEvent{Stage: system.StagePaused})
 }
 
 //export onDestroy
 func onDestroy(view C.CFTypeRef) {
 	w := views[view]
 	delete(views, view)
-	w.w.event(system.DestroyEvent{})
+	w.w.Event(system.DestroyEvent{})
 	C.gio_removeLayer(w.layer)
 	C.CFRelease(w.layer)
 	w.layer = 0
@@ -124,7 +124,7 @@ func onDestroy(view C.CFTypeRef) {
 //export onFocus
 func onFocus(view C.CFTypeRef, focus int) {
 	w := views[view]
-	w.w.event(key.FocusEvent{Focus: focus != 0})
+	w.w.Event(key.FocusEvent{Focus: focus != 0})
 }
 
 //export onLowMemory
@@ -161,7 +161,7 @@ func onDeleteBackward(view C.CFTypeRef) {
 //export onText
 func onText(view C.CFTypeRef, str *C.char) {
 	w := views[view]
-	w.w.event(key.EditEvent{
+	w.w.Event(key.EditEvent{
 		Text: C.GoString(str),
 	})
 }
@@ -184,7 +184,7 @@ func onTouch(last C.int, view, touchRef C.CFTypeRef, phase C.NSInteger, x, y C.C
 	w := views[view]
 	t := time.Duration(float64(ti) * float64(time.Second))
 	p := f32.Point{X: float32(x), Y: float32(y)}
-	w.w.event(pointer.Event{
+	w.w.Event(pointer.Event{
 		Type:      typ,
 		Source:    pointer.Touch,
 		PointerID: w.lookupTouch(last != 0, touchRef),
@@ -193,7 +193,7 @@ func onTouch(last C.int, view, touchRef C.CFTypeRef, phase C.NSInteger, x, y C.C
 	})
 }
 
-func (w *window) setAnimating(anim bool) {
+func (w *window) SetAnimating(anim bool) {
 	if w.view == 0 {
 		return
 	}
@@ -205,7 +205,7 @@ func (w *window) setAnimating(anim bool) {
 }
 
 func (w *window) onKeyCommand(name rune) {
-	w.w.event(key.Event{
+	w.w.Event(key.Event{
 		Name: name,
 	})
 }
@@ -238,7 +238,7 @@ func (w *window) isVisible() bool {
 	return w.visible.Load().(bool)
 }
 
-func (w *window) showTextInput(show bool) {
+func (w *window) ShowTextInput(show bool) {
 	if w.view == 0 {
 		return
 	}
@@ -249,10 +249,10 @@ func (w *window) showTextInput(show bool) {
 	}
 }
 
-func createWindow(win *Window, opts *windowOptions) error {
+func NewWindow(win Callbacks, opts *Options) error {
 	mainWindow.in <- windowAndOptions{win, opts}
 	return <-mainWindow.errs
 }
 
-func main() {
+func Main() {
 }

app/internal/window/os_js.go

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: Unlicense OR MIT
 
-package app
+package window
 
 import (
 	"image"
@@ -18,7 +18,7 @@ type window struct {
 	window                js.Value
 	cnv                   js.Value
 	tarea                 js.Value
-	w                     *Window
+	w                     Callbacks
 	redraw                js.Func
 	requestAnimationFrame js.Value
 	cleanfuncs            []func()
@@ -32,7 +32,7 @@ type window struct {
 
 var mainDone = make(chan struct{})
 
-func createWindow(win *Window, opts *windowOptions) error {
+func NewWindow(win Callbacks, opts *Options) error {
 	doc := js.Global().Get("document")
 	cont := getContainer(doc)
 	cnv := createCanvas(doc)
@@ -52,9 +52,9 @@ func createWindow(win *Window, opts *windowOptions) error {
 	w.addEventListeners()
 	w.w = win
 	go func() {
-		w.w.setDriver(w)
+		w.w.SetDriver(w)
 		w.focus()
-		w.w.event(system.StageEvent{Stage: system.StageRunning})
+		w.w.Event(system.StageEvent{Stage: system.StageRunning})
 		w.draw(true)
 		select {}
 		w.cleanup()
@@ -156,18 +156,18 @@ func (w *window) addEventListeners() {
 			w.touches[i] = js.Null()
 		}
 		w.touches = w.touches[:0]
-		w.w.event(pointer.Event{
+		w.w.Event(pointer.Event{
 			Type:   pointer.Cancel,
 			Source: pointer.Touch,
 		})
 		return nil
 	})
 	w.addEventListener(w.tarea, "focus", func(this js.Value, args []js.Value) interface{} {
-		w.w.event(key.FocusEvent{Focus: true})
+		w.w.Event(key.FocusEvent{Focus: true})
 		return nil
 	})
 	w.addEventListener(w.tarea, "blur", func(this js.Value, args []js.Value) interface{} {
-		w.w.event(key.FocusEvent{Focus: false})
+		w.w.Event(key.FocusEvent{Focus: false})
 		return nil
 	})
 	w.addEventListener(w.tarea, "keydown", func(this js.Value, args []js.Value) interface{} {
@@ -195,7 +195,7 @@ func (w *window) addEventListeners() {
 func (w *window) flushInput() {
 	val := w.tarea.Get("value").String()
 	w.tarea.Set("value", "")
-	w.w.event(key.EditEvent{Text: string(val)})
+	w.w.Event(key.EditEvent{Text: string(val)})
 }
 
 func (w *window) blur() {
@@ -216,7 +216,7 @@ func (w *window) keyEvent(e js.Value) {
 		if e.Call("getModifierState", "Shift").Bool() {
 			cmd.Modifiers |= key.ModShift
 		}
-		w.w.event(cmd)
+		w.w.Event(cmd)
 	}
 }
 
@@ -239,7 +239,7 @@ func (w *window) touchEvent(typ pointer.Type, e js.Value) {
 			X: float32(x) * scale,
 			Y: float32(y) * scale,
 		}
-		w.w.event(pointer.Event{
+		w.w.Event(pointer.Event{
 			Type:      typ,
 			Source:    pointer.Touch,
 			Position:  pos,
@@ -279,7 +279,7 @@ func (w *window) pointerEvent(typ pointer.Type, dx, dy float32, e js.Value) {
 		Y: dy * scale,
 	}
 	t := time.Duration(e.Get("timeStamp").Int()) * time.Millisecond
-	w.w.event(pointer.Event{
+	w.w.Event(pointer.Event{
 		Type:     typ,
 		Source:   pointer.Mouse,
 		Position: pos,
@@ -316,7 +316,7 @@ func (w *window) animCallback() {
 	}
 }
 
-func (w *window) setAnimating(anim bool) {
+func (w *window) SetAnimating(anim bool) {
 	w.mu.Lock()
 	defer w.mu.Unlock()
 	if anim && !w.animating {
@@ -325,7 +325,7 @@ func (w *window) setAnimating(anim bool) {
 	w.animating = anim
 }
 
-func (w *window) showTextInput(show bool) {
+func (w *window) ShowTextInput(show bool) {
 	// Run in a goroutine to avoid a deadlock if the
 	// focus change result in an event.
 	go func() {
@@ -346,7 +346,7 @@ func (w *window) draw(sync bool) {
 	w.scale = float32(scale)
 	w.mu.Unlock()
 	cfg.now = time.Now()
-	w.w.event(frameEvent{
+	w.w.Event(FrameEvent{
 		FrameEvent: system.FrameEvent{
 			Size: image.Point{
 				X: width,
@@ -354,7 +354,7 @@ func (w *window) draw(sync bool) {
 			},
 			Config: &cfg,
 		},
-		sync: sync,
+		Sync: sync,
 	})
 }
 
@@ -377,7 +377,7 @@ func (w *window) config() (int, int, float32, config) {
 	}
 }
 
-func main() {
+func Main() {
 	<-mainDone
 }
 

app/internal/window/os_macos.go

@@ -2,7 +2,7 @@
 
 // +build darwin,!ios
 
-package app
+package window
 
 import (
 	"errors"
@@ -33,7 +33,7 @@ func init() {
 
 type window struct {
 	view  C.CFTypeRef
-	w     *Window
+	w     Callbacks
 	stage system.Stage
 	ppdp  float32
 	scale float32
@@ -81,9 +81,9 @@ func (w *window) contextView() C.CFTypeRef {
 	return w.view
 }
 
-func (w *window) showTextInput(show bool) {}
+func (w *window) ShowTextInput(show bool) {}
 
-func (w *window) setAnimating(anim bool) {
+func (w *window) SetAnimating(anim bool) {
 	var animb C.BOOL
 	if anim {
 		animb = 1
@@ -96,7 +96,7 @@ func (w *window) setStage(stage system.Stage) {
 		return
 	}
 	w.stage = stage
-	w.w.event(system.StageEvent{Stage: stage})
+	w.w.Event(system.StageEvent{Stage: stage})
 }
 
 // Use a top level func for onFrameCallback to avoid
@@ -129,7 +129,7 @@ func gio_onKeys(view C.CFTypeRef, cstr *C.char, ti C.double, mods C.NSUInteger)
 		w := views[view]
 		for _, k := range str {
 			if n, ok := convertKey(k); ok {
-				w.w.event(key.Event{Name: n, Modifiers: kmods})
+				w.w.Event(key.Event{Name: n, Modifiers: kmods})
 			}
 		}
 	})
@@ -140,7 +140,7 @@ func gio_onText(view C.CFTypeRef, cstr *C.char) {
 	str := C.GoString(cstr)
 	viewDo(view, func(views viewMap, view C.CFTypeRef) {
 		w := views[view]
-		w.w.event(key.EditEvent{Text: str})
+		w.w.Event(key.EditEvent{Text: str})
 	})
 }
 
@@ -162,7 +162,7 @@ func gio_onMouse(view C.CFTypeRef, cdir C.int, x, y, dx, dy C.CGFloat, ti C.doub
 		w := views[view]
 		x, y := float32(x)*w.scale, float32(y)*w.scale
 		dx, dy := float32(dx)*w.scale, float32(dy)*w.scale
-		w.w.event(pointer.Event{
+		w.w.Event(pointer.Event{
 			Type:     typ,
 			Source:   pointer.Mouse,
 			Time:     t,
@@ -185,7 +185,7 @@ func gio_onDraw(view C.CFTypeRef) {
 func gio_onFocus(view C.CFTypeRef, focus C.BOOL) {
 	viewDo(view, func(views viewMap, view C.CFTypeRef) {
 		w := views[view]
-		w.w.event(key.FocusEvent{Focus: focus == C.YES})
+		w.w.Event(key.FocusEvent{Focus: focus == C.YES})
 	})
 }
 
@@ -200,7 +200,7 @@ func (w *window) draw(sync bool) {
 	cfg := configFor(w.ppdp, w.scale)
 	cfg.now = time.Now()
 	w.setStage(system.StageRunning)
-	w.w.event(frameEvent{
+	w.w.Event(FrameEvent{
 		FrameEvent: system.FrameEvent{
 			Size: image.Point{
 				X: width,
@@ -208,7 +208,7 @@ func (w *window) draw(sync bool) {
 			},
 			Config: &cfg,
 		},
-		sync: sync,
+		Sync: sync,
 	})
 }
 
@@ -234,7 +234,7 @@ func gio_onTerminate(view C.CFTypeRef) {
 	viewDo(view, func(views viewMap, view C.CFTypeRef) {
 		w := views[view]
 		delete(views, view)
-		w.w.event(system.DestroyEvent{})
+		w.w.Event(system.DestroyEvent{})
 	})
 }
 
@@ -265,17 +265,17 @@ func gio_onCreate(view C.CFTypeRef) {
 		}
 		wopts := <-mainWindow.out
 		w.w = wopts.window
-		w.w.setDriver(w)
+		w.w.SetDriver(w)
 		views[view] = w
 	})
 }
 
-func createWindow(win *Window, opts *windowOptions) error {
+func NewWindow(win Callbacks, opts *Options) error {
 	mainWindow.in <- windowAndOptions{win, opts}
 	return <-mainWindow.errs
 }
 
-func main() {
+func Main() {
 	wopts := <-mainWindow.out
 	view := viewFactory()
 	if view == 0 {

app/internal/window/os_wayland.go

@@ -2,7 +2,7 @@
 
 // +build linux,!android
 
-package app
+package window
 
 import (
 	"bytes"
@@ -80,7 +80,7 @@ type repeatState struct {
 	delay time.Duration
 
 	key   uint32
-	win   *Window
+	win   Callbacks
 	stopC chan struct{}
 
 	start time.Duration
@@ -90,7 +90,7 @@ type repeatState struct {
 }
 
 type window struct {
-	w      *Window
+	w      Callbacks
 	disp   *C.struct_wl_display
 	surf   *C.struct_wl_surface
 	wmSurf *C.struct_xdg_surface
@@ -153,11 +153,11 @@ var (
 	outputConfig = make(map[*C.struct_wl_output]*wlOutput)
 )
 
-func main() {
+func Main() {
 	<-mainDone
 }
 
-func createWindow(window *Window, opts *windowOptions) error {
+func NewWindow(window Callbacks, opts *Options) error {
 	connMu.Lock()
 	defer connMu.Unlock()
 	if len(winMap) > 0 {
@@ -173,7 +173,7 @@ func createWindow(window *Window, opts *windowOptions) error {
 	}
 	w.w = window
 	go func() {
-		w.w.setDriver(w)
+		w.w.SetDriver(w)
 		w.loop()
 		w.destroy()
 		conn.destroy()
@@ -182,7 +182,7 @@ func createWindow(window *Window, opts *windowOptions) error {
 	return nil
 }
 
-func createNativeWindow(opts *windowOptions) (*window, error) {
+func createNativeWindow(opts *Options) (*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)
@@ -449,7 +449,7 @@ func gio_onTouchDown(data unsafe.Pointer, touch *C.struct_wl_touch, serial, t C.
 		X: fromFixed(x) * float32(w.scale),
 		Y: fromFixed(y) * float32(w.scale),
 	}
-	w.w.event(pointer.Event{
+	w.w.Event(pointer.Event{
 		Type:      pointer.Press,
 		Source:    pointer.Touch,
 		Position:  w.lastTouch,
@@ -461,7 +461,7 @@ func gio_onTouchDown(data unsafe.Pointer, touch *C.struct_wl_touch, serial, t C.
 //export gio_onTouchUp
 func gio_onTouchUp(data unsafe.Pointer, touch *C.struct_wl_touch, serial, t C.uint32_t, id C.int32_t) {
 	w := winMap[touch]
-	w.w.event(pointer.Event{
+	w.w.Event(pointer.Event{
 		Type:      pointer.Release,
 		Source:    pointer.Touch,
 		Position:  w.lastTouch,
@@ -477,7 +477,7 @@ func gio_onTouchMotion(data unsafe.Pointer, touch *C.struct_wl_touch, t C.uint32
 		X: fromFixed(x) * float32(w.scale),
 		Y: fromFixed(y) * float32(w.scale),
 	}
-	w.w.event(pointer.Event{
+	w.w.Event(pointer.Event{
 		Type:      pointer.Move,
 		Position:  w.lastTouch,
 		Source:    pointer.Touch,
@@ -493,7 +493,7 @@ func gio_onTouchFrame(data unsafe.Pointer, touch *C.struct_wl_touch) {
 //export gio_onTouchCancel
 func gio_onTouchCancel(data unsafe.Pointer, touch *C.struct_wl_touch) {
 	w := winMap[touch]
-	w.w.event(pointer.Event{
+	w.w.Event(pointer.Event{
 		Type:   pointer.Cancel,
 		Source: pointer.Touch,
 	})
@@ -544,7 +544,7 @@ func gio_onPointerButton(data unsafe.Pointer, p *C.struct_wl_pointer, serial, t,
 	}
 	w.flushScroll()
 	w.resetFling()
-	w.w.event(pointer.Event{
+	w.w.Event(pointer.Event{
 		Type:     typ,
 		Source:   pointer.Mouse,
 		Position: w.lastPos,
@@ -645,14 +645,14 @@ func gio_onKeyboardEnter(data unsafe.Pointer, keyboard *C.struct_wl_keyboard, se
 	conn.repeat.Stop(0)
 	w := winMap[surf]
 	winMap[keyboard] = w
-	w.w.event(key.FocusEvent{Focus: true})
+	w.w.Event(key.FocusEvent{Focus: true})
 }
 
 //export gio_onKeyboardLeave
 func gio_onKeyboardLeave(data unsafe.Pointer, keyboard *C.struct_wl_keyboard, serial C.uint32_t, surf *C.struct_wl_surface) {
 	conn.repeat.Stop(0)
 	w := winMap[keyboard]
-	w.w.event(key.FocusEvent{Focus: false})
+	w.w.Event(key.FocusEvent{Focus: false})
 }
 
 //export gio_onKeyboardKey
@@ -666,7 +666,7 @@ func gio_onKeyboardKey(data unsafe.Pointer, keyboard *C.struct_wl_keyboard, seri
 	}
 	kc := uint32(keyCode)
 	for _, e := range conn.xkb.DispatchKey(kc) {
-		w.w.event(e)
+		w.w.Event(e)
 	}
 	if conn.xkb.IsRepeatKey(kc) {
 		conn.repeat.Start(w, kc, t)
@@ -739,7 +739,7 @@ func (r *repeatState) Repeat() {
 			break
 		}
 		for _, e := range conn.xkb.DispatchKey(r.key) {
-			r.win.event(e)
+			r.win.Event(e)
 		}
 		r.last += delay
 	}
@@ -773,7 +773,7 @@ loop:
 			break
 		}
 		if w.dead {
-			w.w.event(system.DestroyEvent{Err: w.pendingErr})
+			w.w.Event(system.DestroyEvent{Err: w.pendingErr})
 			break
 		}
 		// Clear poll events.
@@ -809,7 +809,7 @@ loop:
 	}
 }
 
-func (w *window) setAnimating(anim bool) {
+func (w *window) SetAnimating(anim bool) {
 	w.mu.Lock()
 	w.animating = anim
 	animating := w.isAnimating()
@@ -924,7 +924,7 @@ func (w *window) flushScroll() {
 	if total == (f32.Point{}) {
 		return
 	}
-	w.w.event(pointer.Event{
+	w.w.Event(pointer.Event{
 		Type:     pointer.Move,
 		Source:   pointer.Mouse,
 		Position: w.lastPos,
@@ -945,7 +945,7 @@ func (w *window) onPointerMotion(x, y C.wl_fixed_t, t C.uint32_t) {
 		X: fromFixed(x) * float32(w.scale),
 		Y: fromFixed(y) * float32(w.scale),
 	}
-	w.w.event(pointer.Event{
+	w.w.Event(pointer.Event{
 		Type:     pointer.Move,
 		Position: w.lastPos,
 		Source:   pointer.Mouse,
@@ -1025,7 +1025,7 @@ func (w *window) draw(sync bool) {
 		C.gio_wl_callback_add_listener(w.lastFrameCallback, unsafe.Pointer(w.surf))
 	}
 	cfg.now = time.Now()
-	w.w.event(frameEvent{
+	w.w.Event(FrameEvent{
 		FrameEvent: system.FrameEvent{
 			Size: image.Point{
 				X: width,
@@ -1033,7 +1033,7 @@ func (w *window) draw(sync bool) {
 			},
 			Config: &cfg,
 		},
-		sync: sync,
+		Sync: sync,
 	})
 }
 
@@ -1042,7 +1042,7 @@ func (w *window) setStage(s system.Stage) {
 		return
 	}
 	w.stage = s
-	w.w.event(system.StageEvent{s})
+	w.w.Event(system.StageEvent{s})
 }
 
 func (w *window) display() *C.struct_wl_display {
@@ -1064,7 +1064,7 @@ func (w *window) surface() (*C.struct_wl_surface, int, int) {
 	return w.surf, width * scale, height * scale
 }
 
-func (w *window) showTextInput(show bool) {}
+func (w *window) ShowTextInput(show bool) {}
 
 // detectFontScale reports current font scale, or 1.0
 // if it fails.

app/internal/window/os_windows.go

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: Unlicense OR MIT
 
-package app
+package window
 
 import (
 	"errors"
@@ -58,7 +58,7 @@ type point struct {
 type window struct {
 	hwnd   syscall.Handle
 	hdc    syscall.Handle
-	w      *Window
+	w      Callbacks
 	width  int
 	height int
 	stage  system.Stage
@@ -159,11 +159,11 @@ const _WM_REDRAW = _WM_USER + 0
 var onceMu sync.Mutex
 var mainDone = make(chan struct{})
 
-func main() {
+func Main() {
 	<-mainDone
 }
 
-func createWindow(window *Window, opts *windowOptions) error {
+func NewWindow(window Callbacks, opts *Options) error {
 	onceMu.Lock()
 	defer onceMu.Unlock()
 	if len(winMap) > 0 {
@@ -183,8 +183,8 @@ func createWindow(window *Window, opts *windowOptions) error {
 		winMap[w.hwnd] = w
 		defer delete(winMap, w.hwnd)
 		w.w = window
-		w.w.setDriver(w)
-		defer w.w.event(system.DestroyEvent{})
+		w.w.SetDriver(w)
+		defer w.w.Event(system.DestroyEvent{})
 		showWindow(w.hwnd, _SW_SHOWDEFAULT)
 		setForegroundWindow(w.hwnd)
 		setFocus(w.hwnd)
@@ -196,7 +196,7 @@ func createWindow(window *Window, opts *windowOptions) error {
 	return <-cerr
 }
 
-func createNativeWindow(opts *windowOptions) (*window, error) {
+func createNativeWindow(opts *Options) (*window, error) {
 	setProcessDPIAware()
 	screenDC, err := getDC(0)
 	if err != nil {
@@ -266,7 +266,7 @@ func windowProc(hwnd syscall.Handle, msg uint32, wParam, lParam uintptr) uintptr
 		fallthrough
 	case _WM_CHAR:
 		if r := rune(wParam); unicode.IsPrint(r) {
-			w.w.event(key.EditEvent{Text: string(r)})
+			w.w.Event(key.EditEvent{Text: string(r)})
 		}
 		// The message is processed.
 		return 1
@@ -279,31 +279,31 @@ func windowProc(hwnd syscall.Handle, msg uint32, wParam, lParam uintptr) uintptr
 			if getKeyState(_VK_SHIFT)&0x1000 != 0 {
 				cmd.Modifiers |= key.ModShift
 			}
-			w.w.event(cmd)
+			w.w.Event(cmd)
 		}
 	case _WM_LBUTTONDOWN:
 		setCapture(w.hwnd)
 		x, y := coordsFromlParam(lParam)
 		p := f32.Point{X: float32(x), Y: float32(y)}
-		w.w.event(pointer.Event{
+		w.w.Event(pointer.Event{
 			Type:     pointer.Press,
 			Source:   pointer.Mouse,
 			Position: p,
 			Time:     getMessageTime(),
 		})
 	case _WM_CANCELMODE:
-		w.w.event(pointer.Event{
+		w.w.Event(pointer.Event{
 			Type: pointer.Cancel,
 		})
 	case _WM_SETFOCUS:
-		w.w.event(key.FocusEvent{Focus: true})
+		w.w.Event(key.FocusEvent{Focus: true})
 	case _WM_KILLFOCUS:
-		w.w.event(key.FocusEvent{Focus: false})
+		w.w.Event(key.FocusEvent{Focus: false})
 	case _WM_LBUTTONUP:
 		releaseCapture()
 		x, y := coordsFromlParam(lParam)
 		p := f32.Point{X: float32(x), Y: float32(y)}
-		w.w.event(pointer.Event{
+		w.w.Event(pointer.Event{
 			Type:     pointer.Release,
 			Source:   pointer.Mouse,
 			Position: p,
@@ -312,7 +312,7 @@ func windowProc(hwnd syscall.Handle, msg uint32, wParam, lParam uintptr) uintptr
 	case _WM_MOUSEMOVE:
 		x, y := coordsFromlParam(lParam)
 		p := f32.Point{X: float32(x), Y: float32(y)}
-		w.w.event(pointer.Event{
+		w.w.Event(pointer.Event{
 			Type:     pointer.Move,
 			Source:   pointer.Mouse,
 			Position: p,
@@ -350,7 +350,7 @@ func (w *window) scrollEvent(wParam, lParam uintptr) {
 	screenToClient(w.hwnd, &np)
 	p := f32.Point{X: float32(np.x), Y: float32(np.y)}
 	dist := float32(int16(wParam >> 16))
-	w.w.event(pointer.Event{
+	w.w.Event(pointer.Event{
 		Type:     pointer.Move,
 		Source:   pointer.Mouse,
 		Position: p,
@@ -381,7 +381,7 @@ func (w *window) loop() error {
 	return nil
 }
 
-func (w *window) setAnimating(anim bool) {
+func (w *window) SetAnimating(anim bool) {
 	w.mu.Lock()
 	w.animating = anim
 	w.mu.Unlock()
@@ -398,7 +398,7 @@ func (w *window) postRedraw() {
 
 func (w *window) setStage(s system.Stage) {
 	w.stage = s
-	w.w.event(system.StageEvent{Stage: s})
+	w.w.Event(system.StageEvent{Stage: s})
 }
 
 func (w *window) draw(sync bool) {
@@ -408,7 +408,7 @@ func (w *window) draw(sync bool) {
 	w.height = int(r.bottom - r.top)
 	cfg := configForDC(w.hdc)
 	cfg.now = time.Now()
-	w.w.event(frameEvent{
+	w.w.Event(FrameEvent{
 		FrameEvent: system.FrameEvent{
 			Size: image.Point{
 				X: w.width,
@@ -416,7 +416,7 @@ func (w *window) draw(sync bool) {
 			},
 			Config: &cfg,
 		},
-		sync: sync,
+		Sync: sync,
 	})
 }
 
@@ -431,7 +431,7 @@ func (w *window) destroy() {
 	}
 }
 
-func (w *window) showTextInput(show bool) {}
+func (w *window) ShowTextInput(show bool) {}
 
 func (w *window) HDC() syscall.Handle {
 	return w.hdc

app/internal/window/runmain.go

@@ -1,6 +1,8 @@
+// SPDX-License-Identifier: Unlicense OR MIT
+
 // +build android darwin,ios
 
-package app
+package window
 
 // Android only supports non-Java programs as c-shared libraries.
 // Unfortunately, Go does not run a program's main function in

app/internal/window/runmain_ios.go

@@ -1,6 +1,8 @@
+// SPDX-License-Identifier: Unlicense OR MIT
+
 // +build darwin,ios
 
-package app
+package window
 
 import "C"
 

app/internal/window/window.go

@@ -0,0 +1,121 @@
+// SPDX-License-Identifier: Unlicense OR MIT
+
+// Package window implements platform specific windows
+// and GPU contexts.
+package window
+
+import (
+	"errors"
+	"math"
+	"time"
+
+	"gioui.org/app/internal/gl"
+	"gioui.org/io/event"
+	"gioui.org/io/system"
+	"gioui.org/unit"
+)
+
+type Options struct {
+	Width, Height unit.Value
+	Title         string
+}
+
+type FrameEvent struct {
+	system.FrameEvent
+
+	Sync bool
+}
+
+type Callbacks interface {
+	SetDriver(d Driver)
+	Event(e event.Event)
+}
+
+// Driver is the interface for the platform implementation
+// of a window.
+type Driver interface {
+	// SetAnimating sets the animation flag. When the window is animating,
+	// FrameEvents are delivered as fast as the display can handle them.
+	SetAnimating(anim bool)
+	// ShowTextInput updates the virtual keyboard state.
+	ShowTextInput(show bool)
+	NewContext() (gl.Context, error)
+}
+
+type windowRendezvous struct {
+	in   chan windowAndOptions
+	out  chan windowAndOptions
+	errs chan error
+}
+
+type windowAndOptions struct {
+	window Callbacks
+	opts   *Options
+}
+
+// config implements the system.Config interface.
+type config struct {
+	// Device pixels per dp.
+	pxPerDp float32
+	// Device pixels per sp.
+	pxPerSp float32
+	now     time.Time
+}
+
+func (c *config) Now() time.Time {
+	return c.now
+}
+
+func (c *config) Px(v unit.Value) int {
+	var r float32
+	switch v.U {
+	case unit.UnitPx:
+		r = v.V
+	case unit.UnitDp:
+		r = c.pxPerDp * v.V
+	case unit.UnitSp:
+		r = c.pxPerSp * v.V
+	default:
+		panic("unknown unit")
+	}
+	return int(math.Round(float64(r)))
+}
+
+func newWindowRendezvous() *windowRendezvous {
+	wr := &windowRendezvous{
+		in:   make(chan windowAndOptions),
+		out:  make(chan windowAndOptions),
+		errs: make(chan error),
+	}
+	go func() {
+		var main windowAndOptions
+		var out chan windowAndOptions
+		for {
+			select {
+			case w := <-wr.in:
+				var err error
+				if main.window != nil {
+					err = errors.New("multiple windows are not supported")
+				}
+				wr.errs <- err
+				main = w
+				out = wr.out
+			case out <- main:
+			}
+		}
+	}()
+	return wr
+}
+
+const (
+	inchPrDp = 1.0 / 160
+	mmPrDp   = 25.4 / 160
+	// monitorScale is the extra scale applied to
+	// monitor outputs to compensate for the extra
+	// viewing distance compared to phone and tables.
+	monitorScale = 1.20
+	// minDensity is the minimum pixels per dp to
+	// ensure font and ui legibility on low-dpi
+	// screens.
+	minDensity = 1.25
+)

app/window.go

@@ -10,6 +10,7 @@ import (
 
 	"gioui.org/app/internal/gpu"
 	"gioui.org/app/internal/input"
+	"gioui.org/app/internal/window"
 	"gioui.org/io/event"
 	"gioui.org/io/profile"
 	"gioui.org/io/system"
@@ -18,22 +19,11 @@ import (
 )
 
 // WindowOption configures a Window.
-type Option func(opts *windowOptions)
-
-type windowOptions struct {
-	Width, Height unit.Value
-	Title         string
-}
-
-type frameEvent struct {
-	system.FrameEvent
-
-	sync bool
-}
+type Option func(opts *window.Options)
 
 // Window represents an operating system window.
 type Window struct {
-	driver    *window
+	driver    window.Driver
 	lastFrame time.Time
 	drawStart time.Time
 	gpu       *gpu.GPU
@@ -51,6 +41,12 @@ type Window struct {
 	delayedDraw  *time.Timer
 
 	queue Queue
+
+	callbacks callbacks
+}
+
+type callbacks struct {
+	w *Window
 }
 
 // Queue is an event.Queue implementation that distributes system events
@@ -62,19 +58,9 @@ type Queue struct {
 // driverEvent is sent when a new native driver
 // is available for the Window.
 type driverEvent struct {
-	driver *window
+	driver window.Driver
 }
 
-// driver is the interface for the platform implementation
-// of a Window.
-var _ interface {
-	// setAnimating sets the animation flag. When the window is animating,
-	// FrameEvents are delivered as fast as the display can handle them.
-	setAnimating(anim bool)
-	// showTextInput updates the virtual keyboard state.
-	showTextInput(show bool)
-} = (*window)(nil)
-
 // Pre-allocate the ack event to avoid garbage.
 var ackEvent event.Event
 
@@ -90,7 +76,7 @@ var ackEvent event.Event
 //
 // BUG: Calling NewWindow more than once is not yet supported.
 func NewWindow(options ...Option) *Window {
-	opts := &windowOptions{
+	opts := &window.Options{
 		Width:  unit.Dp(800),
 		Height: unit.Dp(600),
 		Title:  "Gio",
@@ -107,6 +93,7 @@ func NewWindow(options ...Option) *Window {
 		invalidates: make(chan struct{}, 1),
 		frames:      make(chan *op.Ops),
 	}
+	w.callbacks.w = w
 	go w.run(opts)
 	return w
 }
@@ -141,9 +128,9 @@ func (w *Window) draw(size image.Point, frame *op.Ops) {
 	now := time.Now()
 	switch w.queue.q.TextInputState() {
 	case input.TextInputOpen:
-		w.driver.showTextInput(true)
+		w.driver.ShowTextInput(true)
 	case input.TextInputClose:
-		w.driver.showTextInput(false)
+		w.driver.ShowTextInput(false)
 	}
 	frameDur := now.Sub(w.lastFrame)
 	frameDur = frameDur.Truncate(100 * time.Microsecond)
@@ -186,7 +173,7 @@ func (w *Window) updateAnimation() {
 	}
 	if animate != w.animating {
 		w.animating = animate
-		w.driver.setAnimating(animate)
+		w.driver.SetAnimating(animate)
 	}
 }
 
@@ -197,13 +184,13 @@ func (w *Window) setNextFrame(at time.Time) {
 	}
 }
 
-func (w *Window) setDriver(d *window) {
-	w.event(driverEvent{d})
+func (c *callbacks) SetDriver(d window.Driver) {
+	c.Event(driverEvent{d})
 }
 
-func (w *Window) event(e event.Event) {
-	w.in <- e
-	<-w.ack
+func (c *callbacks) Event(e event.Event) {
+	c.w.in <- e
+	<-c.w.ack
 }
 
 func (w *Window) waitAck() {
@@ -226,10 +213,10 @@ func (w *Window) destroy(err error) {
 	}
 }
 
-func (w *Window) run(opts *windowOptions) {
+func (w *Window) run(opts *window.Options) {
 	defer close(w.in)
 	defer close(w.out)
-	if err := createWindow(w, opts); err != nil {
+	if err := window.NewWindow(&w.callbacks, opts); err != nil {
 		w.out <- system.DestroyEvent{Err: err}
 		return
 	}
@@ -260,7 +247,7 @@ func (w *Window) run(opts *windowOptions) {
 				w.updateAnimation()
 				w.out <- e
 				w.waitAck()
-			case frameEvent:
+			case window.FrameEvent:
 				if e2.Size == (image.Point{}) {
 					panic(errors.New("internal error: zero-sized Draw"))
 				}
@@ -280,7 +267,7 @@ func (w *Window) run(opts *windowOptions) {
 				case w.out <- ackEvent:
 				}
 				if w.gpu != nil {
-					if e2.sync {
+					if e2.Sync {
 						w.gpu.Refresh()
 					}
 					if err := w.gpu.Flush(); err != nil {
@@ -290,7 +277,7 @@ func (w *Window) run(opts *windowOptions) {
 						return
 					}
 				} else {
-					ctx, err := newContext(w.driver)
+					ctx, err := w.driver.NewContext()
 					if err != nil {
 						w.destroy(err)
 						return
@@ -302,7 +289,7 @@ func (w *Window) run(opts *windowOptions) {
 					}
 				}
 				w.draw(e2.Size, frame)
-				if e2.sync {
+				if e2.Sync {
 					if err := w.gpu.Flush(); err != nil {
 						w.gpu.Release()
 						w.gpu = nil
@@ -337,7 +324,7 @@ func (q *Queue) Events(k event.Key) []event.Event {
 
 // Title sets the title of the window.
 func Title(t string) Option {
-	return func(opts *windowOptions) {
+	return func(opts *window.Options) {
 		opts.Title = t
 	}
 }
@@ -350,7 +337,7 @@ func Size(w, h unit.Value) Option {
 	if h.V <= 0 {
 		panic("height must be larger than or equal to 0")
 	}
-	return func(opts *windowOptions) {
+	return func(opts *window.Options) {
 		opts.Width = w
 		opts.Height = h
 	}