[gnome-software/wip/kalev/download-step: 5/10] updates section: Split up offline update downloading and installing

[Kalev Lember <klember src gnome org>]

commit b23afadc9de282de3d928cb20844e4752067a96a
Author: Kalev Lember <klember redhat com>
Date:   Tue Oct 23 10:54:19 2018 +0200

    updates section: Split up offline update downloading and installing
    
    This implements a part of the autoupdates mockup that commit 9df8f0a
    missed, adding an explicit Download step before the Restart & Update for
    offline updates.
    
    If we don't do that, then we get a super confusing user experience where
    clicking on "Restart & Update" takes several minutes (or possibly
    several hours on slow network) and the page is seemingly hung, without
    any feedback, and then minutes or hours later out of the blue we
    suddenly get the shell restart dialog (which has a 60 second timer,
    rebooting when it expires).
    
    
https://raw.githubusercontent.com/gnome-design-team/gnome-mockups-software/master/wireframes/updates-list-sections.png
    
    https://bugzilla.redhat.com/show_bug.cgi?id=1640701

 src/gs-updates-section.c | 77 ++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 74 insertions(+), 3 deletions(-)
---
diff --git a/src/gs-updates-section.c b/src/gs-updates-section.c
index 3d3f576f..e37a8946 100644
--- a/src/gs-updates-section.c
+++ b/src/gs-updates-section.c
@@ -45,6 +45,7 @@ struct _GsUpdatesSection
        GtkSizeGroup            *sizegroup_desc;
        GtkSizeGroup            *sizegroup_button;
        GtkSizeGroup            *sizegroup_header;
+       GtkWidget               *button_download;
        GtkWidget               *button_update;
        GtkWidget               *button_cancel;
        GtkStack                *button_stack;
@@ -113,6 +114,7 @@ gs_updates_section_remove_all (GsUpdatesSection *self)
        /* the following are set in _build_section_header(); clear these so
         * that they don't become dangling pointers once all items are removed
         * from self->list */
+       self->button_download = NULL;
        self->button_update = NULL;
        self->button_cancel = NULL;
        self->button_stack = NULL;
@@ -236,6 +238,20 @@ _reboot_failed_cb (GObject *source, GAsyncResult *res, gpointer user_data)
                                            self);
 }
 
+static gboolean
+_all_offline_updates_downloaded (GsUpdatesSection *self)
+{
+       /* use the download size to figure out what is downloaded and what not */
+       for (guint i = 0; i < gs_app_list_length (self->list); i++) {
+               GsApp *app = gs_app_list_index (self->list, i);
+               guint64 size = gs_app_get_size_download (app);
+               if (size != 0)
+                       return FALSE;
+       }
+
+       return TRUE;
+}
+
 static void
 _update_buttons (GsUpdatesSection *self)
 {
@@ -250,9 +266,13 @@ _update_buttons (GsUpdatesSection *self)
 
        if (self->kind == GS_UPDATES_SECTION_KIND_OFFLINE_FIRMWARE ||
            self->kind == GS_UPDATES_SECTION_KIND_OFFLINE) {
-               gtk_stack_set_visible_child_name (self->button_stack, "update");
+               if (_all_offline_updates_downloaded (self))
+                       gtk_stack_set_visible_child_name (self->button_stack, "update");
+               else
+                       gtk_stack_set_visible_child_name (self->button_stack, "download");
+
                gtk_widget_show (GTK_WIDGET (self->button_stack));
-               /* TRANSLATORS: This is the button for upgrading all
+               /* TRANSLATORS: This is the button for installing all
                 * offline updates */
                gtk_button_set_label (GTK_BUTTON (self->button_update), _("Restart & Update"));
        } else if (self->kind == GS_UPDATES_SECTION_KIND_ONLINE) {
@@ -324,6 +344,44 @@ _button_cancel_clicked_cb (GtkButton *button, GsUpdatesSection *self)
        _update_buttons (self);
 }
 
+static void
+_download_finished_cb (GObject *object, GAsyncResult *res, gpointer user_data)
+{
+       g_autoptr(GsUpdatesSection) self = (GsUpdatesSection *) user_data;
+       g_autoptr(GError) error = NULL;
+       g_autoptr(GsAppList) list = NULL;
+
+       /* get result */
+       list = gs_plugin_loader_job_process_finish (GS_PLUGIN_LOADER (object), res, &error);
+       if (list == NULL) {
+               if (!g_error_matches (error, GS_PLUGIN_ERROR, GS_PLUGIN_ERROR_CANCELLED))
+                       g_warning ("failed to download updates: %s", error->message);
+       }
+
+       g_clear_object (&self->cancellable);
+       _update_buttons (self);
+}
+
+static void
+_button_download_clicked_cb (GtkButton *button, GsUpdatesSection *self)
+{
+       g_autoptr(GError) error = NULL;
+       g_autoptr(GCancellable) cancellable = g_cancellable_new ();
+       g_autoptr(GsPluginJob) plugin_job = NULL;
+
+       g_set_object (&self->cancellable, cancellable);
+       plugin_job = gs_plugin_job_newv (GS_PLUGIN_ACTION_DOWNLOAD,
+                                        "list", self->list,
+                                        "refine-flags", GS_PLUGIN_REFINE_FLAGS_REQUIRE_SIZE,
+                                        "interactive", TRUE,
+                                        NULL);
+       gs_plugin_loader_job_process_async (self->plugin_loader, plugin_job,
+                                           self->cancellable,
+                                           (GAsyncReadyCallback) _download_finished_cb,
+                                           g_object_ref (self));
+       _update_buttons (self);
+}
+
 static GsAppList *
 _get_listbox_apps (GsUpdatesSection *self)
 {
@@ -423,7 +481,20 @@ _build_section_header (GsUpdatesSection *self)
        gtk_box_pack_end (GTK_BOX (header), GTK_WIDGET (self->button_stack), FALSE, FALSE, 0);
        gtk_size_group_add_widget (self->sizegroup_button, GTK_WIDGET (self->button_stack));
 
-       /* add button, which may be hidden */
+       /* add download button */
+       self->button_download = gs_progress_button_new ();
+       gtk_button_set_use_underline (GTK_BUTTON (self->button_download), TRUE);
+       gtk_button_set_label (GTK_BUTTON (self->button_download), _("_Download"));
+       context = gtk_widget_get_style_context (self->button_download);
+       gtk_style_context_add_class (context, GTK_STYLE_CLASS_SUGGESTED_ACTION);
+       g_signal_connect (self->button_download, "clicked",
+                         G_CALLBACK (_button_download_clicked_cb),
+                         self);
+       gtk_stack_add_named (self->button_stack, self->button_download, "download");
+       gtk_widget_set_visible (self->button_download, TRUE);
+       gtk_widget_set_margin_end (self->button_download, 6);
+
+       /* add update button */
        self->button_update = gs_progress_button_new ();
        context = gtk_widget_get_style_context (self->button_update);
        gtk_style_context_add_class (context, GTK_STYLE_CLASS_SUGGESTED_ACTION);