malcontent-control: Add link to guidance on how to set parental controls

Try and nudge parents/carers towards the best practice for how to set
parental controls on a user, by linking them to appropriate external
content from people who know what they’re talking about.

This external content can vary in the translations so that parents are
pointed to appropriate localised guidelines. In the UK, for example,
this may be
https://www.nspcc.org.uk/keeping-children-safe/online-safety/.

Signed-off-by: Philip Withnall <pwithnall@endlessos.org>

libmalcontent-ui/user-controls.ui

@@ -4,7 +4,6 @@
   <requires lib="gtk+" version="3.12"/>
   <template class="MctUserControls" parent="GtkGrid">
     <property name="visible">True</property>
-    <property name="margin-top">18</property>
     <property name="row-spacing">6</property>
     <property name="column-spacing">12</property>
     <property name="valign">start</property>

malcontent-control/application.c

@@ -80,6 +80,7 @@ struct _MctApplication
   GtkLabel *error_message;
   GtkLockButton *lock_button;
   GtkButton *user_accounts_panel_button;
+  GtkLabel *help_label;
 };
 
 G_DEFINE_TYPE (MctApplication, mct_application, GTK_TYPE_APPLICATION)
@@ -211,6 +212,7 @@ mct_application_activate (GApplication *application)
       self->error_message = GTK_LABEL (gtk_builder_get_object (builder, "error_message"));
       self->lock_button = GTK_LOCK_BUTTON (gtk_builder_get_object (builder, "lock_button"));
       self->user_accounts_panel_button = GTK_BUTTON (gtk_builder_get_object (builder, "user_accounts_panel_button"));
+      self->help_label = GTK_LABEL (gtk_builder_get_object (builder, "help_label"));
 
       /* Connect signals. */
       g_signal_connect_object (self->user_selector, "notify::user",
@@ -391,6 +393,24 @@ update_main_stack (MctApplication *self)
     }
   else if (is_permission_loaded && is_user_manager_loaded)
     {
+      g_autofree gchar *help_label = NULL;
+
+      /* Translators: Replace the link to commonsensemedia.org with some
+       * localised guidance for parents/carers on how to set restrictions on
+       * their child/caree in a responsible way which is in keeping with the
+       * best practice and culture of the region. If no suitable localised
+       * guidance exists, and if the default commonsensemedia.org link is not
+       * suitable, please file an issue against malcontent so we can discuss
+       * further!
+       * https://gitlab.freedesktop.org/pwithnall/malcontent/-/issues/new
+       */
+      help_label = g_strdup_printf (_("It’s recommended that restrictions are "
+                                      "set as part of an ongoing conversation "
+                                      "with %s. <a href='https://www.commonsensemedia.org/privacy-and-internet-safety'>"
+                                      "Read guidance</a> on what to consider."),
+                                    act_user_get_real_name (selected_user));
+      gtk_label_set_markup (self->help_label, help_label);
+
       mct_user_controls_set_user (self->user_controls, selected_user);
 
       new_page_name = "controls";

malcontent-control/main.ui

@@ -3,8 +3,8 @@
 <interface>
   <requires lib="gtk+" version="3.12"/>
   <object class="GtkApplicationWindow" id="main_window">
-    <property name="default-width">500</property>
+    <property name="default-width">540</property>
-    <property name="default-height">520</property>
+    <property name="default-height">580</property>
     <child type="titlebar">
       <object class="GtkHeaderBar" id="header">
         <property name="show-close-button">True</property>
@@ -55,13 +55,35 @@
               <object class="GtkScrolledWindow">
                 <property name="visible">True</property>
                 <property name="hscrollbar-policy">never</property>
-                <property name="min-content-height">350</property>
+                <property name="min-content-height">370</property>
                 <child>
-                  <object class="MctUserControls" id="user_controls">
+                  <object class="GtkBox">
-                    <property name="halign">center</property>
+                    <property name="margin">18</property>
+                    <property name="orientation">vertical</property>
+                    <property name="spacing">18</property>
                     <property name="visible">True</property>
-                    <property name="margin">12</property>
+                    <child>
-                    <property name="dbus-connection">dbus_connection</property>
+                      <object class="GtkLabel" id="help_label">
+                        <!-- Content is set in code; this string is just a placeholder -->
+                        <property name="label">It’s recommended that restrictions are set as part of an ongoing conversation with $name. Read guidance on what to consider.</property>
+                        <property name="visible">True</property>
+                        <property name="wrap">True</property>
+                        <property name="xalign">0.0</property>
+                        <property name="yalign">0.0</property>
+                        <child internal-child="accessible">
+                          <object class="AtkObject">
+                            <property name="AtkObject::accessible-role">static</property>
+                          </object>
+                        </child>
+                      </object>
+                    </child>
+                    <child>
+                      <object class="MctUserControls" id="user_controls">
+                        <property name="halign">center</property>
+                        <property name="visible">True</property>
+                        <property name="dbus-connection">dbus_connection</property>
+                      </object>
+                    </child>
                   </object>
                 </child>
               </object>