[v2, Linux] fix menu background color (#2873)

* fix menu background color

* remove commented line

* handle transparent window and background color

---------

Co-authored-by: Lea Anthony <lea.anthony@gmail.com>

v2/internal/frontend/desktop/linux/window.c

@@ -4,6 +4,7 @@
 #include <stdio.h>
 #include <limits.h>
 #include <stdint.h>
+#include <locale.h>
 #include "window.h"
 
 // These are the x,y,time & button of the last mouse down event
@@ -145,20 +146,39 @@ void SetBackgroundColour(void *data)
 {
     // set webview's background color
     RGBAOptions *options = (RGBAOptions *)data;
+
     GdkRGBA colour = {options->r / 255.0, options->g / 255.0, options->b / 255.0, options->a / 255.0};
+    if (options->windowIsTranslucent != NULL && options->windowIsTranslucent == TRUE)
+    {
+        colour.alpha = 0.0;
+    }
     webkit_web_view_set_background_color(WEBKIT_WEB_VIEW(options->webview), &colour);
 
     // set window's background color
-    GtkWidget *window = GTK_WIDGET(options->window);
-    gchar *str = g_strdup_printf("window {background-color: rgba(%d, %d, %d, %d);}", options->r, options->g, options->b, options->a);
+    // Get the name of the current locale
+    char *old_locale, *saved_locale;
+    old_locale = setlocale(LC_ALL, NULL);
+
+    // Copy the name so it won’t be clobbered by setlocale.
+    saved_locale = strdup(old_locale);
+    if (saved_locale == NULL)
+        return;
+
+    //Now change the locale to english for so printf always converts floats with a dot decimal separator
+    setlocale(LC_ALL, "en_US.UTF-8");
+    gchar *str = g_strdup_printf("#webview-box {background-color: rgba(%d, %d, %d, %1.1f);}", options->r, options->g, options->b, options->a / 255.0);
+
+    //Restore the original locale.
+    setlocale(LC_ALL, saved_locale);
+    free(saved_locale);
 
     if (windowCssProvider == NULL)
     {
         windowCssProvider = gtk_css_provider_new();
         gtk_style_context_add_provider(
-            gtk_widget_get_style_context(window),
+            gtk_widget_get_style_context(GTK_WIDGET(options->webviewBox)),
             GTK_STYLE_PROVIDER(windowCssProvider),
-            GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
+            GTK_STYLE_PROVIDER_PRIORITY_USER);
         g_object_unref(windowCssProvider);
     }
 

v2/internal/frontend/desktop/linux/window.go

@@ -43,6 +43,7 @@ type Window struct {
 	webview                                  unsafe.Pointer
 	applicationMenu                          *menu.Menu
 	menubar                                  *C.GtkWidget
+	webviewBox                               *C.GtkWidget
 	vbox                                     *C.GtkWidget
 	accels                                   *C.GtkAccelGroup
 	minWidth, minHeight, maxWidth, maxHeight int
@@ -72,6 +73,11 @@ func NewWindow(appoptions *options.App, debug bool, devtools bool) *Window {
 	C.g_object_ref_sink(C.gpointer(gtkWindow))
 	result.gtkWindow = unsafe.Pointer(gtkWindow)
 
+	webviewName := C.CString("webview-box")
+	defer C.free(unsafe.Pointer(webviewName))
+	result.webviewBox = C.gtk_box_new(C.GTK_ORIENTATION_VERTICAL, 0)
+	C.gtk_widget_set_name(result.webviewBox, webviewName)
+
 	result.vbox = C.gtk_box_new(C.GTK_ORIENTATION_VERTICAL, 0)
 	C.gtk_container_add(result.asGTKContainer(), result.vbox)
 
@@ -265,13 +271,18 @@ func (w *Window) IsNormal() bool {
 }
 
 func (w *Window) SetBackgroundColour(r uint8, g uint8, b uint8, a uint8) {
+	windowIsTranslucent := false
+	if w.appoptions.Linux != nil && w.appoptions.Linux.WindowIsTranslucent {
+		windowIsTranslucent = true
+	}
 	data := C.RGBAOptions{
-		r:       C.uchar(r),
-		g:       C.uchar(g),
-		b:       C.uchar(b),
-		a:       C.uchar(a),
-		webview: w.webview,
-		window:  w.gtkWindow,
+		r:                   C.uchar(r),
+		g:                   C.uchar(g),
+		b:                   C.uchar(b),
+		a:                   C.uchar(a),
+		webview:             w.webview,
+		webviewBox:          unsafe.Pointer(w.webviewBox),
+		windowIsTranslucent: gtkBool(windowIsTranslucent),
 	}
 	invokeOnMainThread(func() { C.SetBackgroundColour(unsafe.Pointer(&data)) })
 
@@ -288,7 +299,9 @@ func (w *Window) Run(url string) {
 	if w.menubar != nil {
 		C.gtk_box_pack_start(C.GTKBOX(unsafe.Pointer(w.vbox)), w.menubar, 0, 0, 0)
 	}
-	C.gtk_box_pack_start(C.GTKBOX(unsafe.Pointer(w.vbox)), C.GTKWIDGET(w.webview), 1, 1, 0)
+
+	C.gtk_box_pack_start(C.GTKBOX(unsafe.Pointer(w.webviewBox)), C.GTKWIDGET(w.webview), 1, 1, 0)
+	C.gtk_box_pack_start(C.GTKBOX(unsafe.Pointer(w.vbox)), w.webviewBox, 1, 1, 0)
 	_url := C.CString(url)
 	C.LoadIndex(w.webview, _url)
 	defer C.free(unsafe.Pointer(_url))

v2/internal/frontend/desktop/linux/window.h

@@ -55,7 +55,8 @@ typedef struct RGBAOptions
     uint8_t b;
     uint8_t a;
     void *webview;
-    void *window;
+    void *webviewBox;
+    gboolean windowIsTranslucent;
 } RGBAOptions;
 
 typedef struct SetTitleArgs