Added the UserAgent function to the Session interface

app_scripts.js

@@ -42,9 +42,19 @@ function socketOpen() {
 		}
 	}
 
-	const lang = window.navigator.languages;
+	const lang = window.navigator.language;
 	if (lang) {
-		message += ",languages=\"" + lang + "\"";
+		message += ",language=\"" + lang + "\"";
+	}
+
+	const langs = window.navigator.languages;
+	if (langs) {
+		message += ",languages=\"" + langs + "\"";
+	}
+
+	const userAgent = window.navigator.userAgent
+	if (userAgent) {
+		message += ",user-agent=\"" + userAgent + "\"";
 	}
 
 	const darkThemeMq = window.matchMedia("(prefers-color-scheme: dark)");

demo/canvasDemo.go

@@ -74,7 +74,13 @@ func textCanvasDemo(canvas rui.Canvas) {
 	canvas.SetTextAlign(rui.LeftAlign)
 	canvas.SetTextBaseline(rui.TopBaseline)
 
-	canvas.SetSolidColorFillStyle(0xFF000000)
+	if canvas.View().Session().DarkTheme() {
+		canvas.SetSolidColorFillStyle(0xFFFFFFFF)
+		canvas.SetSolidColorStrokeStyle(0xFFFFFFFF)
+	} else {
+		canvas.SetSolidColorFillStyle(0xFF000000)
+		canvas.SetSolidColorStrokeStyle(0xFF000000)
+	}
 	canvas.FillText(10, 10, "Default font")
 	canvas.StrokeText(300, 10, "Default font")
 
@@ -136,7 +142,11 @@ func textCanvasDemo(canvas rui.Canvas) {
 func textAlignCanvasDemo(canvas rui.Canvas) {
 	canvas.Save()
 	canvas.SetFont("sans-serif", rui.Pt(10))
-	canvas.SetSolidColorFillStyle(0xFF000000)
+	if canvas.View().Session().DarkTheme() {
+		canvas.SetSolidColorFillStyle(0xFFFFFFFF)
+	} else {
+		canvas.SetSolidColorFillStyle(0xFF000000)
+	}
 	canvas.SetSolidColorStrokeStyle(0xFF00FFFF)
 
 	baseline := []string{"Alphabetic", "Top", "Middle", "Bottom", "Hanging", "Ideographic"}
@@ -176,18 +186,28 @@ func lineStyleCanvasDemo(canvas rui.Canvas) {
 		canvas.SetLineWidth(1)
 		y := float64(40 + 20*i)
 		canvas.DrawLine(10, y, 180, y)
-		canvas.SetSolidColorStrokeStyle(0xFF000000)
+		if canvas.View().Session().DarkTheme() {
+			canvas.SetSolidColorStrokeStyle(0xFFFFFFFF)
+		} else {
+			canvas.SetSolidColorStrokeStyle(0xFF000000)
+		}
+
 		canvas.SetLineWidth(10)
 		canvas.SetLineCap(i)
 		canvas.DrawLine(20, y, 170, y)
 		canvas.FillText(200, y, cap)
 	}
 
-	canvas.SetSolidColorStrokeStyle(0xFF0000FF)
+	if canvas.View().Session().DarkTheme() {
+		canvas.SetSolidColorStrokeStyle(0xFFFFFFFF)
+		canvas.SetSolidColorFillStyle(0xFF00FFFF)
+	} else {
+		canvas.SetSolidColorStrokeStyle(0xFF000000)
+		canvas.SetSolidColorFillStyle(0xFF0000FF)
+	}
 	canvas.SetFont("courier", rui.Pt(12))
 	canvas.FillText(80, 115, "SetLineJoin(...)")
 
-	canvas.SetSolidColorStrokeStyle(0xFF000000)
 	canvas.SetLineWidth(10)
 	canvas.SetLineCap(rui.ButtCap)
 
@@ -206,14 +226,11 @@ func lineStyleCanvasDemo(canvas rui.Canvas) {
 		canvas.StrokePath(path)
 		canvas.FillText(210, y+20, join)
 	}
-
-	canvas.SetSolidColorStrokeStyle(0xFF0000FF)
 	canvas.SetFont("courier", rui.Pt(12))
 	canvas.FillText(20, 300, "SetLineDash([]float64{16, 8, 4, 8}, ...)")
 
 	canvas.SetFont("courier", rui.Pt(10))
 	canvas.SetLineDash([]float64{16, 8, 4, 8}, 0)
-	canvas.SetSolidColorStrokeStyle(0xFF000000)
 	canvas.SetLineWidth(4)
 
 	canvas.SetLineCap(rui.ButtCap)
@@ -246,8 +263,13 @@ func transformCanvasDemo(canvas rui.Canvas) {
 		y1 := y0 + float64((ny-1)*20)
 
 		canvas.SetFont("serif", rui.Pt(10))
-		canvas.SetSolidColorFillStyle(rui.Black)
-
+		if canvas.View().Session().DarkTheme() {
+			canvas.SetSolidColorStrokeStyle(0xFFFFFFFF)
+			canvas.SetSolidColorFillStyle(0xFFFFFFFF)
+		} else {
+			canvas.SetSolidColorStrokeStyle(0xFF000000)
+			canvas.SetSolidColorFillStyle(0xFF000000)
+		}
 		canvas.SetTextAlign(rui.CenterAlign)
 		canvas.SetTextBaseline(rui.BottomBaseline)
 		for i := 0; i < nx; i++ {
@@ -266,7 +288,11 @@ func transformCanvasDemo(canvas rui.Canvas) {
 	}
 
 	canvas.SetFont("courier", rui.Pt(14))
-	canvas.SetSolidColorFillStyle(rui.Black)
+	if canvas.View().Session().DarkTheme() {
+		canvas.SetSolidColorFillStyle(0xFFFFFFFF)
+	} else {
+		canvas.SetSolidColorFillStyle(0xFF000000)
+	}
 	canvas.SetTextAlign(rui.CenterAlign)
 	canvas.SetTextBaseline(rui.TopBaseline)
 

session.go

@@ -33,6 +33,8 @@ type Session interface {
 	Color(tag string) (Color, bool)
 	// SetCustomTheme set the custom theme
 	SetCustomTheme(name string) bool
+	// UserAgent() returns the "user-agent" text of the client browser
+	UserAgent() string
 	// Language returns the current session language
 	Language() string
 	// SetLanguage set the current session language
@@ -106,6 +108,7 @@ type sessionData struct {
 	touchScreen      bool
 	textDirection    int
 	pixelRatio       float64
+	userAgent        string
 	language         string
 	languages        []string
 	checkboxOff      string
@@ -148,12 +151,20 @@ func newSession(app Application, id int, customTheme string, params DataObject)
 		session.touchScreen = (value == "1" || value == "true")
 	}
 
+	if value, ok := params.PropertyValue("user-agent"); ok {
+		session.userAgent = value
+	}
+
 	if value, ok := params.PropertyValue("direction"); ok {
 		if value == "rtl" {
 			session.textDirection = RightToLeftDirection
 		}
 	}
 
+	if value, ok := params.PropertyValue("language"); ok {
+		session.language = value
+	}
+
 	if value, ok := params.PropertyValue("languages"); ok {
 		session.languages = strings.Split(value, ",")
 	}

sessionTheme.go

@@ -328,6 +328,10 @@ func (session *sessionData) radiobuttonOnImage() string {
 	return session.radiobuttonOn
 }
 
+func (session *sessionData) UserAgent() string {
+	return session.userAgent
+}
+
 func (session *sessionData) Language() string {
 	if session.language != "" {
 		return session.language