[gnome-boxes/remote-viewer-only] app: Introduce "Remote Viewer" runtime mode

[Felipe Borges <felipeborges src gnome org>]

commit a694469cef6331bf69fbe87b6a38581ac2d17f69
Author: Felipe Borges <felipeborges gnome org>
Date:   Wed Jan 8 11:24:57 2020 +0100

    app: Introduce "Remote Viewer" runtime mode
    
    By running Boxes with the --remote-viewer option, the user gets a
    version of the application without the virtualization bits. It also
    prevents Boxes from conecting/launching the virtualization backend.
    
    Fixes #177

 data/ui/collection-toolbar.ui | 15 +++++++++++++--
 src/app.vala                  | 19 +++++++++++++------
 src/collection-toolbar.vala   | 15 +++++++++++++--
 src/wizard-source.vala        |  2 ++
 4 files changed, 41 insertions(+), 10 deletions(-)
---
diff --git a/data/ui/collection-toolbar.ui b/data/ui/collection-toolbar.ui
index 2e1d0ce1..f3dd4d10 100644
--- a/data/ui/collection-toolbar.ui
+++ b/data/ui/collection-toolbar.ui
@@ -9,8 +9,19 @@
     </style>
 
     <child type="title">
-      <object class="BoxesCollectionFilterSwitcher" id="filter_switcher">
+      <object class="GtkStack" id="title_stack">
         <property name="visible">True</property>
+       <child>
+          <object class="BoxesCollectionFilterSwitcher" id="filter_switcher">
+            <property name="visible">True</property>
+          </object>
+        </child>
+       <child>
+         <object class="GtkLabel" id="remote_viewer_title">
+           <property name="visible">True</property>
+           <property name="label" translatable="yes">Remote Viewer</property>
+         </object>
+       </child>
       </object>
     </child>
 
@@ -232,7 +243,7 @@
         <property name="orientation">vertical</property>
         <property name="margin">10</property>
         <child>
-          <object class="GtkModelButton">
+          <object class="GtkModelButton" id="create_vm_entry">
             <property name="visible">True</property>
             <property name="text" translatable="yes">Create a Virtual Machine…</property>
             <signal name="clicked" handler="on_create_vm_btn_clicked"/>
diff --git a/src/app.vala b/src/app.vala
index 5fe63c9d..ca91d80c 100644
--- a/src/app.vala
+++ b/src/app.vala
@@ -134,11 +134,6 @@ public override void startup () {
         Gtk.init (ref args2);
 
         collection = new Collection ();
-
-        brokers.insert ("libvirt", LibvirtBroker.get_default ());
-
-        check_cpu_vt_capability.begin ();
-        check_module_kvm_loaded.begin ();
     }
 
     public bool has_broker_for_source_type (string type) {
@@ -165,12 +160,21 @@ public override void activate () {
 
         activate_async.begin ();
 
+       if (opt_remote_viewer)
+            return;
+
+        brokers.insert ("libvirt", LibvirtBroker.get_default ());
+
+        check_cpu_vt_capability.begin ();
+        check_module_kvm_loaded.begin ();
+
         window.show_welcome_tutorial ();
     }
 
     static bool opt_fullscreen;
     static bool opt_help;
     static string opt_open_uuid;
+    public static bool opt_remote_viewer;
     static string[] opt_uris;
     static string[] opt_search;
     const OptionEntry[] options = {
@@ -179,6 +183,7 @@ public override void activate () {
         { "checks", 0, 0, OptionArg.NONE, null, N_("Check virtualization capabilities"), null },
         { "open-uuid", 0, 0, OptionArg.STRING, ref opt_open_uuid, N_("Open box with UUID"), null },
         { "search", 0, 0, OptionArg.STRING_ARRAY, ref opt_search, N_("Search term"), null },
+        { "remote-viewer", 0, 0, OptionArg.NONE, ref opt_remote_viewer, N_("Launch only remote viewing 
capabilities"), null },
         // A 'broker' is a virtual-machine manager (local or remote). Currently only libvirt is supported.
         { "", 0, 0, OptionArg.STRING_ARRAY, ref opt_uris, N_("URL to display, broker or installer media"), 
null },
         { null }
@@ -187,6 +192,7 @@ public override void activate () {
     public override int command_line (GLib.ApplicationCommandLine cmdline) {
         opt_fullscreen = false;
         opt_help = false;
+        opt_remote_viewer = false;
         opt_open_uuid = null;
         opt_uris = null;
         opt_search = null;
@@ -416,7 +422,8 @@ public async void add_collection_source (CollectionSource source) throws GLib.Er
     private async void activate_async () {
         yield move_configs_from_cache ();
 
-        yield setup_default_source ();
+       if (!opt_remote_viewer)
+            yield setup_default_source ();
 
         is_ready = true;
         ready ();
diff --git a/src/collection-toolbar.vala b/src/collection-toolbar.vala
index 281058a9..f4027bcc 100644
--- a/src/collection-toolbar.vala
+++ b/src/collection-toolbar.vala
@@ -20,7 +20,13 @@
     [GtkChild]
     private MenuButton hamburger_btn;
     [GtkChild]
+    private ModelButton create_vm_entry;
+    [GtkChild]
+    private Stack title_stack;
+    [GtkChild]
     private CollectionFilterSwitcher filter_switcher;
+    [GtkChild]
+    private Label remote_viewer_title;
 
     private AppWindow window;
 
@@ -43,7 +49,12 @@ public void setup_ui (AppWindow window) {
         window.notify["ui-state"].connect (ui_state_changed);
         App.app.notify["main-window"].connect (ui_state_changed);
 
-        filter_switcher.setup_ui (window);
+        if (!App.opt_remote_viewer)
+            filter_switcher.setup_ui (window);
+        else {
+            create_vm_entry.visible = false;
+           title_stack.set_visible_child (remote_viewer_title);
+        }
 
         var builder = new Builder.from_resource ("/org/gnome/Boxes/ui/menus.ui");
         MenuModel menu = (MenuModel) builder.get_object ("app-menu");
@@ -118,7 +129,7 @@ private void ui_state_changed () {
             new_btn.show ();
             grid_btn.visible = window.view_type != AppWindow.ViewType.ICON;
             list_btn.visible = window.view_type != AppWindow.ViewType.LIST;
-            custom_title = filter_switcher;
+            custom_title = title_stack;
             break;
 
         case UIState.CREDS:
diff --git a/src/wizard-source.vala b/src/wizard-source.vala
index d008692f..aec549e1 100644
--- a/src/wizard-source.vala
+++ b/src/wizard-source.vala
@@ -482,6 +482,8 @@ private void add_media_entry (InstallerMedia media) {
     }
 
     private async void update_libvirt_sytem_entry_visibility () {
+       if (App.opt_remote_viewer)
+               return;
         try {
             libvirt_sys_importer = yield new LibvirtSystemImporter ();
         } catch (GLib.Error error) {