[gnome-control-center] wifi: Add a refresh button

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 5ad72b6faa0437f1b329f30845fa7cd9216ceee6
Author: Xiang Fan <sfanxiang gmail com>
Date:   Fri Nov 3 22:54:10 2017 +0800

    wifi: Add a refresh button
    
    This way, user can scan anytime without having to wait.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=789869

 panels/network/cc-wifi-panel.c   |   22 ++++++++++++++++++++++
 panels/network/net-device-wifi.c |   16 ++++++++++++++++
 panels/network/net-device-wifi.h |    1 +
 panels/network/wifi.ui           |   28 ++++++++++++++++++++++++++--
 4 files changed, 65 insertions(+), 2 deletions(-)
---
diff --git a/panels/network/cc-wifi-panel.c b/panels/network/cc-wifi-panel.c
index 7fceb35..b85e990 100644
--- a/panels/network/cc-wifi-panel.c
+++ b/panels/network/cc-wifi-panel.c
@@ -451,6 +451,27 @@ rfkill_switch_notify_activate_cb (GtkSwitch   *rfkill_switch,
                      NULL);
 }
 
+static void
+button_refresh_clicked_cb (GtkButton   *button,
+                           CcWifiPanel *self)
+{
+  const gchar *id;
+  guint i;
+
+  id = gtk_stack_get_visible_child_name (self->stack);
+
+  for (i = 0; i < self->devices->len; i++)
+    {
+      NetObject *object = g_ptr_array_index (self->devices, i);
+
+      if (g_strcmp0 (net_object_get_id (object), id) == 0)
+        {
+          net_device_wifi_request_scan (NET_DEVICE_WIFI (object));
+          break;
+        }
+    }
+}
+
 /* Overrides */
 
 static const gchar *
@@ -595,6 +616,7 @@ cc_wifi_panel_class_init (CcWifiPanelClass *klass)
   gtk_widget_class_bind_template_child (widget_class, CcWifiPanel, stack);
 
   gtk_widget_class_bind_template_callback (widget_class, rfkill_switch_notify_activate_cb);
+  gtk_widget_class_bind_template_callback (widget_class, button_refresh_clicked_cb);
 
   g_object_class_override_property (object_class, PROP_PARAMETERS, "parameters");
 }
diff --git a/panels/network/net-device-wifi.c b/panels/network/net-device-wifi.c
index 2a765da..8632d63 100644
--- a/panels/network/net-device-wifi.c
+++ b/panels/network/net-device-wifi.c
@@ -92,6 +92,22 @@ net_device_wifi_get_title_widget (NetDeviceWifi *device_wifi)
         return GTK_WIDGET (gtk_builder_get_object (device_wifi->priv->builder, "center_box"));
 }
 
+void
+net_device_wifi_request_scan (NetDeviceWifi *device_wifi)
+{
+        NMDevice *nm_device;
+        GError *error = NULL;
+
+        nm_device = net_device_get_nm_device (NET_DEVICE (device_wifi));
+        g_return_if_fail (nm_device_get_device_type (nm_device) == NM_DEVICE_TYPE_WIFI);
+
+        nm_device_wifi_request_scan (NM_DEVICE_WIFI (nm_device), NULL, &error);
+        if (error) {
+                g_debug ("scan request failed: %s", error->message);
+                g_error_free (error);
+        }
+}
+
 static GtkWidget *
 device_wifi_proxy_add_to_stack (NetObject    *object,
                                 GtkStack     *stack,
diff --git a/panels/network/net-device-wifi.h b/panels/network/net-device-wifi.h
index d8baf50..0ae1537 100644
--- a/panels/network/net-device-wifi.h
+++ b/panels/network/net-device-wifi.h
@@ -53,6 +53,7 @@ struct _NetDeviceWifiClass
 GType            net_device_wifi_get_type          (void) G_GNUC_CONST;
 GtkWidget       *net_device_wifi_get_header_widget (NetDeviceWifi *device_wifi);
 GtkWidget       *net_device_wifi_get_title_widget  (NetDeviceWifi *device_wifi);
+void             net_device_wifi_request_scan      (NetDeviceWifi *device_wifi);
 
 G_END_DECLS
 
diff --git a/panels/network/wifi.ui b/panels/network/wifi.ui
index 8bb01ed..c15096e 100644
--- a/panels/network/wifi.ui
+++ b/panels/network/wifi.ui
@@ -189,14 +189,14 @@
                       <object class="GtkBox">
                         <property name="visible">True</property>
                         <property name="hexpand">True</property>
-                        <property name="halign">start</property>
                         <property name="spacing">6</property>
+                        <property name="margin_bottom">6</property>
                         <child>
                           <object class="GtkLabel">
                             <property name="visible">True</property>
                             <property name="label" translatable="yes">Visible Networks</property>
                             <property name="xalign">0.0</property>
-                            <property name="margin_bottom">12</property>
+                            <property name="margin_bottom">6</property>
                             <attributes>
                               <attribute name="weight" value="bold"/>
                             </attributes>
@@ -205,8 +205,32 @@
                         <child>
                           <object class="GtkSpinner" id="spinner">
                             <property name="hexpand">True</property>
+                            <property name="margin_bottom">6</property>
                           </object>
                         </child>
+                        <child>
+                          <object class="GtkButton">
+                            <property name="visible">True</property>
+                            <property name="can_focus">True</property>
+                            <property name="halign">end</property>
+                            <property name="relief">none</property>
+                            <signal name="clicked" handler="button_refresh_clicked_cb" object="CcWifiPanel" 
swapped="no"/>
+                            <child>
+                              <object class="GtkImage">
+                                <property name="visible">True</property>
+                                <property name="can_focus">False</property>
+                                <property name="icon_name">view-refresh-symbolic</property>
+                                <property name="icon_size">button</property>
+                              </object>
+                            </child>
+                            <style>
+                              <class name="image-button"/>
+                            </style>
+                          </object>
+                          <packing>
+                            <property name="pack-type">end</property>
+                          </packing>
+                        </child>
                       </object>
                       <packing>
                         <property name="left-attach">1</property>