views/week-view-common: Port from GtkStyleContext to GtkSnapshot

GtkStyleContext methods are deprecated.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-calendar/-/merge_requests/707>

src/gui/views/gcal-week-hour-bar.c

@@ -105,7 +105,6 @@ gcal_week_hour_bar_init (GcalWeekHourBar *self)
     {
       GtkWidget *label = gtk_label_new ("");
 
-      gtk_widget_add_css_class (label, "line");
       gtk_widget_add_css_class (label, "dimmed");
       gtk_widget_set_vexpand (label, TRUE);
       gtk_label_set_yalign (GTK_LABEL (label), 0.0);

src/gui/views/gcal-week-view-common.c

@@ -28,7 +28,6 @@ gcal_week_view_common_snapshot_hour_lines (GtkWidget      *widget,
                                            gint            width,
                                            gint            height)
 {
-  GtkStyleContext *context;
   GdkRGBA color;
   gboolean ltr;
   gdouble column_width;
@@ -36,11 +35,10 @@ gcal_week_view_common_snapshot_hour_lines (GtkWidget      *widget,
 
   ltr = gtk_widget_get_direction (widget) != GTK_TEXT_DIR_RTL;
 
-  context = gtk_widget_get_style_context (widget);
-  gtk_style_context_save (context);
-  gtk_style_context_add_class (context, "lines");
-  gtk_style_context_get_color (context, &color);
-  gtk_style_context_restore (context);
+  gtk_snapshot_save (snapshot);
+  gtk_widget_get_color (widget, &color);
+  color.alpha = 0.15;
+  gtk_snapshot_restore (snapshot);
 
   column_width = width / 7.0;
 

src/theme/style.css

@@ -221,19 +221,11 @@ label.month-name {
 
 /* Week View CSS */
 
-.week-header.lines {
-  color: rgb(from var(--window-fg-color) r g b / 15%);
-}
-
 weekhourbar > label {
   font-size: 10pt;
   padding: 4px 6px;
 }
 
-.week-view .lines {
-  color: rgb(from var(--window-fg-color) r g b / 15%);
-}
-
 .week-main-content {
   border: 0 solid var(--border-color);
   border-width: 1px 0;