ui: Add SetWindowTitle

Fixes #595

internal/ui/ui_glfw.go

@@ -311,6 +311,16 @@ func IsRunnableInBackground() bool {
 	return currentUI.isRunnableInBackground()
 }
 
+func SetWindowTitle(title string) {
+	if !currentUI.isRunning() {
+		return
+	}
+	_ = currentUI.runOnMainThread(func() error {
+		currentUI.window.SetTitle(title)
+		return nil
+	})
+}
+
 func SetWindowIcon(iconImages []image.Image) {
 	if !currentUI.isRunning() {
 		currentUI.setInitIconImages(iconImages)

internal/ui/ui_js.go

@@ -112,6 +112,11 @@ func SetCursorVisible(visible bool) {
 	}
 }
 
+func SetWindowTitle(title string) {
+	doc := js.Global.Get("document")
+	doc.Set("title", title)
+}
+
 func SetWindowIcon(iconImages []image.Image) {
 	// Do nothing
 }

internal/ui/ui_mobile.go

@@ -360,6 +360,10 @@ func SetRunnableInBackground(runnableInBackground bool) {
 	// Do nothing
 }
 
+func SetWindowTitle(title string) {
+	// Do nothing
+}
+
 func SetWindowIcon(iconImages []image.Image) {
 	// Do nothing
 }

run.go

@@ -428,6 +428,15 @@ func SetRunnableInBackground(runnableInBackground bool) {
 	ui.SetRunnableInBackground(runnableInBackground)
 }
 
+// SetWindowTitle sets the title of the window.
+//
+// SetWindowTitle does nothing on mobiles.
+//
+// SetWindowTitle is concurrent-safe.
+func SetWindowTitle(title string) {
+	ui.SetWindowTitle(title)
+}
+
 // SetWindowIcon sets the icon of the game window.
 //
 // If len(iconImages) is 0, SetWindowIcon reverts the icon to the default one.