malcontent-control: Add initial draft of main interface

This replicates the old interface from Endless’ gnome-control-center,
with no attempt to improve or rework it. That will come later.

It might not work fully.

It allows a user to be selected, and their parental controls to be
changed. It currently doesn’t filter the users.

It supports a simple ‘Loading’ screen, before displaying the main
interface. If loading fails (due to a D-Bus error with accountsservice),
an error page is displayed instead.

Signed-off-by: Philip Withnall <withnall@endlessm.com>

malcontent-control/application.c

@@ -21,6 +21,7 @@
 
 #include "config.h"
 
+#include <act/act.h>
 #include <glib.h>
 #include <glib-object.h>
 #include <glib/gi18n-lib.h>
@@ -28,6 +29,16 @@
 #include <gtk/gtk.h>
 
 #include "application.h"
+#include "user-controls.h"
+#include "user-selector.h"
+
+
+static void user_selector_notify_user_cb (GObject    *obj,
+                                          GParamSpec *pspec,
+                                          gpointer    user_data);
+static void user_manager_notify_is_loaded_cb (GObject    *obj,
+                                              GParamSpec *pspec,
+                                              gpointer    user_data);
 
 
 /**
@@ -41,6 +52,14 @@
 struct _MctApplication
 {
   GtkApplication parent_instance;
+
+  ActUserManager *user_manager;  /* (owned) */
+
+  MctUserSelector *user_selector;
+  MctUserControls *user_controls;
+  GtkStack *main_stack;
+  GtkLabel *error_title;
+  GtkLabel *error_message;
 };
 
 G_DEFINE_TYPE (MctApplication, mct_application, GTK_TYPE_APPLICATION)
@@ -69,27 +88,77 @@ mct_application_constructed (GObject *object)
   G_OBJECT_CLASS (mct_application_parent_class)->constructed (object);
 }
 
+static void
+mct_application_dispose (GObject *object)
+{
+  MctApplication *self = MCT_APPLICATION (object);
+
+  if (self->user_manager != NULL)
+    {
+      g_signal_handlers_disconnect_by_func (self->user_manager,
+                                            user_manager_notify_is_loaded_cb, self);
+      g_clear_object (&self->user_manager);
+    }
+
+  G_OBJECT_CLASS (mct_application_parent_class)->dispose (object);
+}
+
+static GtkWindow *
+mct_application_get_main_window (MctApplication *self)
+{
+  return gtk_application_get_active_window (GTK_APPLICATION (self));
+}
+
 static void
 mct_application_activate (GApplication *application)
 {
-  GList *windows;  /* (element-type GtkWindow) */
+  MctApplication *self = MCT_APPLICATION (application);
   GtkWindow *window = NULL;
 
-  windows = gtk_application_get_windows (GTK_APPLICATION (application));
-  if (windows != NULL)
-    window = windows->data;
+  window = mct_application_get_main_window (self);
 
   if (window == NULL)
     {
       g_autoptr(GtkBuilder) builder = NULL;
+      g_autoptr(GError) local_error = NULL;
 
-      builder = gtk_builder_new_from_resource ("/org/freedesktop/MalcontentControl/ui/main.ui");
+      /* Ensure the types used in the UI are registered. */
+      g_type_ensure (MCT_TYPE_USER_CONTROLS);
+      g_type_ensure (MCT_TYPE_USER_SELECTOR);
+
+      builder = gtk_builder_new ();
+
+      g_assert (self->user_manager == NULL);
+      self->user_manager = g_object_ref (act_user_manager_get_default ());
 
       gtk_builder_set_translation_domain (builder, "malcontent");
+      gtk_builder_expose_object (builder, "user_manager", G_OBJECT (self->user_manager));
+
+      gtk_builder_add_from_resource (builder, "/org/freedesktop/MalcontentControl/ui/main.ui", &local_error);
+      g_assert (local_error == NULL);
 
       /* Set up the main window. */
       window = GTK_WINDOW (gtk_builder_get_object (builder, "main_window"));
       gtk_window_set_application (window, GTK_APPLICATION (application));
+
+      self->main_stack = GTK_STACK (gtk_builder_get_object (builder, "main_stack"));
+      self->user_selector = MCT_USER_SELECTOR (gtk_builder_get_object (builder, "user_selector"));
+      self->user_controls = MCT_USER_CONTROLS (gtk_builder_get_object (builder, "user_controls"));
+      self->error_title = GTK_LABEL (gtk_builder_get_object (builder, "error_title"));
+      self->error_message = GTK_LABEL (gtk_builder_get_object (builder, "error_message"));
+
+      /* Connect signals. */
+      g_signal_connect (self->user_selector, "notify::user",
+                        G_CALLBACK (user_selector_notify_user_cb),
+                        self);
+      g_signal_connect (self->user_manager, "notify::is-loaded",
+                        G_CALLBACK (user_manager_notify_is_loaded_cb), self);
+
+      /* Work out whether to show the loading page or the main page, and show
+       * the controls for the initially selected user. */
+      user_selector_notify_user_cb (G_OBJECT (self->user_selector), NULL, self);
+      user_manager_notify_is_loaded_cb (G_OBJECT (self->user_manager), NULL, self);
+
       gtk_widget_show (GTK_WIDGET (window));
     }
 
@@ -104,9 +173,61 @@ mct_application_class_init (MctApplicationClass *klass)
   GApplicationClass *application_class = G_APPLICATION_CLASS (klass);
 
   object_class->constructed = mct_application_constructed;
+  object_class->dispose = mct_application_dispose;
+
   application_class->activate = mct_application_activate;
 }
 
+static void
+user_selector_notify_user_cb (GObject    *obj,
+                              GParamSpec *pspec,
+                              gpointer    user_data)
+{
+  MctUserSelector *selector = MCT_USER_SELECTOR (obj);
+  MctApplication *self = MCT_APPLICATION (user_data);
+  ActUser *user;
+
+  user = mct_user_selector_get_user (selector);
+
+  mct_user_controls_set_user (self->user_controls, user);
+}
+
+static void
+user_manager_notify_is_loaded_cb (GObject    *obj,
+                                  GParamSpec *pspec,
+                                  gpointer    user_data)
+{
+  MctApplication *self = MCT_APPLICATION (user_data);
+  ActUserManager *user_manager = ACT_USER_MANAGER (obj);
+  gboolean is_loaded;
+  const gchar *new_page_name;
+
+  /* The implementation of #ActUserManager guarantees that once is-loaded is
+   * true, it is never reset to false. */
+  g_object_get (user_manager, "is-loaded", &is_loaded, NULL);
+
+  /* Handle any loading errors. */
+  if (is_loaded && act_user_manager_no_service (user_manager))
+    {
+      gtk_label_set_label (self->error_title,
+                           _("Failed to load user data from the system"));
+      gtk_label_set_label (self->error_message,
+                           _("Please make sure that the AccountsService is installed and enabled."));
+
+      new_page_name = "error";
+    }
+  else if (is_loaded)
+    {
+      new_page_name = "controls";
+    }
+  else
+    {
+      new_page_name = "loading";
+    }
+
+  gtk_stack_set_visible_child_name (self->main_stack, new_page_name);
+}
+
 /**
  * mct_application_new:
  *

malcontent-control/main.ui

@@ -1,11 +1,117 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<!-- Copyright © 2019 Endless Mobile, Inc. -->
+<!-- Copyright © 2019, 2020 Endless Mobile, Inc. -->
 <interface>
   <requires lib="gtk+" version="3.12"/>
   <object class="GtkApplicationWindow" id="main_window">
+    <property name="default-width">500</property>
+    <property name="default-height">700</property>
     <child>
-      <object class="GtkBox" id="vbox1">
-        <property name="orientation">vertical</property>
+      <object class="GtkStack" id="main_stack">
+        <property name="visible">True</property>
+        <child>
+          <object class="GtkBox">
+            <property name="visible">True</property>
+            <property name="orientation">vertical</property>
+            <property name="border_width">0</property>
+            <child>
+              <object class="MctUserSelector" id="user_selector">
+                <property name="visible">True</property>
+                <property name="user-manager">user_manager</property>
+                <accessibility>
+                  <relation target="user_controls" type="controller-for"/>
+                </accessibility>
+              </object>
+              <packing>
+                <property name="fill">False</property>
+                <property name="expand">False</property>
+              </packing>
+            </child>
+            <child>
+              <object class="GtkScrolledWindow">
+                <property name="visible">True</property>
+                <property name="hscrollbar-policy">never</property>
+                <property name="min-content-height">450</property>
+                <child>
+                  <object class="MctUserControls" id="user_controls">
+                    <property name="visible">True</property>
+                    <property name="margin">12</property>
+                  </object>
+                </child>
+              </object>
+              <packing>
+                <property name="expand">True</property>
+              </packing>
+            </child>
+          </object>
+          <packing>
+            <property name="name">controls</property>
+          </packing>
+        </child>
+
+        <child>
+          <object class="GtkBox">
+            <property name="visible">True</property>
+            <property name="orientation">vertical</property>
+            <property name="hexpand">True</property>
+            <property name="vexpand">True</property>
+            <child type="center">
+              <object class="GtkLabel">
+                <property name="visible">True</property>
+                <property name="label" translatable="yes">Loading…</property>
+                <attributes>
+                  <attribute name="scale" value="1.4"/>
+                </attributes>
+                <child internal-child="accessible">
+                  <object class="AtkObject">
+                    <property name="AtkObject::accessible-role">static</property>
+                  </object>
+                </child>
+              </object>
+            </child>
+          </object>
+          <packing>
+            <property name="name">loading</property>
+          </packing>
+        </child>
+
+        <child>
+          <object class="GtkBox">
+            <property name="visible">True</property>
+            <property name="orientation">vertical</property>
+            <property name="hexpand">True</property>
+            <property name="vexpand">True</property>
+            <child type="center">
+              <object class="GtkBox">
+                <property name="visible">True</property>
+                <property name="orientation">vertical</property>
+                <property name="spacing">12</property>
+                <child>
+                  <object class="GtkLabel" id="error_title">
+                    <property name="visible">True</property>
+                    <property name="label"></property>
+                    <attributes>
+                      <attribute name="scale" value="1.4"/>
+                    </attributes>
+                  </object>
+                </child>
+                <child>
+                  <object class="GtkLabel" id="error_message">
+                    <property name="visible">True</property>
+                    <property name="label"></property>
+                  </object>
+                </child>
+              </object>
+            </child>
+            <child internal-child="accessible">
+              <object class="AtkObject">
+                <property name="AtkObject::accessible-role">alert</property>
+              </object>
+            </child>
+          </object>
+          <packing>
+            <property name="name">error</property>
+          </packing>
+        </child>
       </object>
     </child>
   </object>