calendar-row: Add read-only icon for read-only calendars

Co-authored-by: Gotam Gorabh <gautamy672@gmail.com>

src/gui/calendar-management/calendar-row.ui

@@ -13,6 +13,16 @@
       </object>
     </child>
 
+    <!-- Lock icon for read-only calendars -->
+    <child type="suffix">
+      <object class="GtkImage" id="read_only_icon">
+        <property name="tooltip-text" translatable="yes">Read-only Calendar</property>
+        <property name="icon-name">changes-prevent-symbolic</property>
+        <property name="pixel-size">20</property>
+        <property name="valign">center</property>
+      </object>
+    </child>
+
     <child type="suffix">
       <object class="GtkSwitch" id="switch">
         <property name="valign">center</property>

src/gui/calendar-management/gcal-calendars-page.c

@@ -22,6 +22,7 @@
 
 #include <glib/gi18n.h>
 
+#include "gcal-calendar.h"
 #include "gcal-context.h"
 #include "gcal-calendar-management-page.h"
 #include "gcal-calendars-page.h"
@@ -70,6 +71,7 @@ make_calendar_row (GcalCalendarsPage *self,
   g_autoptr (GdkPaintable) color_paintable = NULL;
   g_autofree gchar *parent_name = NULL;
   g_autoptr (GtkBuilder) builder = NULL;
+  GtkWidget *read_only_icon;
   const GdkRGBA *color;
   GcalManager *manager;
   GtkWidget *icon;
@@ -88,6 +90,10 @@ make_calendar_row (GcalCalendarsPage *self,
    */
   row = g_object_ref (GTK_WIDGET (gtk_builder_get_object (builder, "row")));
 
+  /* read-only icon */
+  read_only_icon = GTK_WIDGET (gtk_builder_get_object (builder, "read_only_icon"));
+  gtk_widget_set_visible (read_only_icon, gcal_calendar_is_read_only (calendar));
+
   /* source color icon */
   color = gcal_calendar_get_color (calendar);
   color_paintable = get_circle_paintable_from_color (color, 24);