app: set focused attribue on fore/background events for ios and android

app/os_android.go

@@ -121,7 +121,6 @@ import "C"
 import (
 	"errors"
 	"fmt"
-	"gioui.org/io/transfer"
 	"image"
 	"image/color"
 	"io"
@@ -147,6 +146,7 @@ import (
 	"gioui.org/io/pointer"
 	"gioui.org/io/semantic"
 	"gioui.org/io/system"
+	"gioui.org/io/transfer"
 	"gioui.org/unit"
 )
 
@@ -527,13 +527,17 @@ func Java_org_gioui_GioView_onStopView(env *C.JNIEnv, class C.jclass, handle C.j
 	w := cgo.Handle(handle).Value().(*window)
 	w.started = false
 	w.visible = false
+	w.focused = false
+
 	w.sendConfigEvent()
 }
 
 //export Java_org_gioui_GioView_onStartView
 func Java_org_gioui_GioView_onStartView(env *C.JNIEnv, class C.jclass, handle C.jlong) {
 	w := cgo.Handle(handle).Value().(*window)
 	w.started = true
+	w.focused = true
+
 	if w.win != nil {
 		w.setVisible(env)
 	}

app/os_ios.go

@@ -132,6 +132,9 @@ func onCreate(view, controller C.CFTypeRef) {
 	w := &window{
 		view: view,
 		w:    wopts.window,
+		config: Config{
+			Focused: true,
+		},
 	}
 	w.loop = newEventLoop(w.w, w.wakeup)
 	w.w.SetDriver(w)
@@ -196,13 +199,17 @@ func (w *window) draw(sync bool) {
 func onStop(h C.uintptr_t) {
 	w := viewFor(h)
 	w.hidden = true
+	w.config.Focused = false
+	w.ProcessEvent(ConfigEvent{Config: w.config})
 }
 
 //export onStart
 func onStart(h C.uintptr_t) {
 	w := viewFor(h)
 	w.hidden = false
+	w.config.Focused = true
 	w.draw(true)
+	w.ProcessEvent(ConfigEvent{Config: w.config})
 }
 
 //export onDestroy

app/window.go

@@ -667,11 +667,15 @@ func (w *Window) processEvent(e event.Event) bool {
 		w.decorations.Config = e2.Config
 		e2.Config = w.effectiveConfig()
 		w.coalesced.cfg = &e2
+
+		handled := false
 		if f := w.decorations.Config.Focused; f != wasFocused {
 			w.queue.Queue(key.FocusEvent{Focus: f})
+			// Ensures focus change is processed on android.
+			handled = true
 		}
-		t, handled := w.queue.WakeupTime()
-		if handled {
+		t, h := w.queue.WakeupTime()
+		if handled || h {
 			w.setNextFrame(t)
 			w.updateAnimation()
 		}