[polari] initialSetup: Add offline handling

[Florian Müllner <fmuellner src gnome org>]

commit 446a6334f2cb1b884f271782aaea420576fb3298
Author: Florian Müllner <fmuellner gnome org>
Date:   Mon Aug 7 00:11:20 2017 +0200

    initialSetup: Add offline handling
    
    The guided setup assumes that we can connect to a newly connected
    account and fetch the room list, which means it is fairly useless
    without an internet connection - there's little we can do about
    that, except for telling the user ...
    
    https://bugzilla.gnome.org/show_bug.cgi?id=772458

 data/resources/initial-setup-window.ui |   55 ++++++++++++++++++++++++++++++++
 src/initialSetup.js                    |   32 ++++++++++++++----
 2 files changed, 80 insertions(+), 7 deletions(-)
---
diff --git a/data/resources/initial-setup-window.ui b/data/resources/initial-setup-window.ui
index a183fc6..b663e7a 100644
--- a/data/resources/initial-setup-window.ui
+++ b/data/resources/initial-setup-window.ui
@@ -34,6 +34,61 @@
         <property name="transition-type">slide-left-right</property>
         <property name="vexpand">True</property>
         <child>
+          <object class="GtkGrid">
+            <property name="visible">True</property>
+            <property name="halign">center</property>
+            <property name="valign">center</property>
+            <property name="row_spacing">6</property>
+            <property name="column_spacing">18</property>
+            <child>
+              <object class="GtkImage">
+                <property name="visible">True</property>
+                <property name="pixel_size">64</property>
+                <property name="icon_name">network-offline-symbolic</property>
+                <style>
+                  <class name="dim-label"/>
+                </style>
+              </object>
+              <packing>
+                <property name="height">2</property>
+              </packing>
+            </child>
+            <child>
+              <object class="GtkLabel">
+                <property name="visible">True</property>
+                <property name="halign">start</property>
+                <property name="label" translatable="yes">Not connected</property>
+                <style>
+                  <class name="polari-setup-title"/>
+                </style>
+              </object>
+              <packing>
+                <property name="left_attach">1</property>
+              </packing>
+            </child>
+            <child>
+              <object class="GtkLabel">
+                <property name="visible">True</property>
+                <property name="can_focus">False</property>
+                <property name="label" translatable="yes">Please connect to the internet to continue the 
setup.</property>
+                <property name="wrap">True</property>
+                <property name="max_width_chars">30</property>
+                <property name="xalign">0</property>
+                <style>
+                  <class name="dim-label"/>
+                </style>
+              </object>
+              <packing>
+                <property name="left_attach">1</property>
+                <property name="top_attach">1</property>
+              </packing>
+            </child>
+          </object>
+          <packing>
+            <property name="name">offline-hint</property>
+          </packing>
+        </child>
+        <child>
           <object class="GtkBox">
             <property name="orientation">vertical</property>
             <property name="visible">True</property>
diff --git a/src/initialSetup.js b/src/initialSetup.js
index e677015..dc0149e 100644
--- a/src/initialSetup.js
+++ b/src/initialSetup.js
@@ -7,7 +7,8 @@ const Utils = imports.utils;
 
 const SetupPage = {
     CONNECTION: 0,
-    ROOM: 1
+    ROOM: 1,
+    OFFLINE: 2
 };
 
 var InitialSetupWindow = new Lang.Class({
@@ -56,14 +57,29 @@ var InitialSetupWindow = new Lang.Class({
             }
         });
 
-        this._setPage(SetupPage.CONNECTION);
+        this._networkMonitor = Gio.NetworkMonitor.get_default();
+        this._networkMonitor.connect('notify::network-available',
+                                     Lang.bind(this, this._onNetworkAvailableChanged));
+        this._onNetworkAvailableChanged();
+    },
+
+    _onNetworkAvailableChanged: function() {
+        if (this._networkMonitor.network_available)
+            this._setPage(this._currentAccount ? SetupPage.ROOM
+                                               : SetupPage.CONNECTION);
+        else
+            this._setPage(SetupPage.OFFLINE);
     },
 
     _setPage: function(page) {
-        let isLastPage = page == SetupPage.ROOM;
+        if (page == SetupPage.CONNECTION)
+            this._contentStack.visible_child_name = 'connections';
+        else if (page == SetupPage.ROOM)
+            this._contentStack.visible_child_name = 'rooms';
+        else
+            this._contentStack.visible_child_name = 'offline-hint';
 
-        this._contentStack.visible_child_name = isLastPage ? 'rooms'
-                                                           : 'connections';
+        let isLastPage = page == SetupPage.ROOM;
 
         this._prevButton.label = isLastPage ? _("_Back") : _("_Cancel");
         this._nextButton.label = isLastPage ? _("_Done") : _("_Next");
@@ -91,12 +107,14 @@ var InitialSetupWindow = new Lang.Class({
     get _page() {
         if (this._contentStack.visible_child_name == 'rooms')
             return SetupPage.ROOM;
-        else
+        else if (this._contentStack.visible_child_name == 'connections')
             return SetupPage.CONNECTION;
+        else
+            return SetupPage.OFFLINE;
     },
 
     _updateNextSensitivity: function() {
-        let sensitive = true;
+        let sensitive = this._page != SetupPage.OFFLINE;
 
         if (this._page == SetupPage.ROOM)
             sensitive = this._serverRoomList.can_join;