[gtk/state-saving: 14/14] exampleapp9: Add state saving

[Matthias Clasen <matthiasc src gnome org>]

commit a7edd0992e6a888395cc1c543d9d21de9b2de7e5
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Jun 3 10:03:50 2021 -0400

    exampleapp9: Add state saving
    
    This tests the GtkApplication state saving support.

 examples/application9/exampleapp.c    | 10 ++++--
 examples/application9/exampleappwin.c | 58 +++++++++++++++++++++++++++++++++++
 examples/application9/window.ui       |  6 ++++
 3 files changed, 71 insertions(+), 3 deletions(-)
---
diff --git a/examples/application9/exampleapp.c b/examples/application9/exampleapp.c
index 62607e40ae..e697d9198f 100644
--- a/examples/application9/exampleapp.c
+++ b/examples/application9/exampleapp.c
@@ -59,12 +59,14 @@ example_app_startup (GApplication *app)
 }
 
 static void
-example_app_activate (GApplication *app)
+example_app_create_window (GtkApplication *app,
+                           const char     *save_id)
 {
   ExampleAppWindow *win;
 
   win = example_app_window_new (EXAMPLE_APP (app));
-  gtk_window_present (GTK_WINDOW (win));
+  gtk_widget_set_save_id (GTK_WIDGET (win), save_id);
+  /* FIXME: differentiate save ids */
 }
 
 static void
@@ -93,8 +95,8 @@ static void
 example_app_class_init (ExampleAppClass *class)
 {
   G_APPLICATION_CLASS (class)->startup = example_app_startup;
-  G_APPLICATION_CLASS (class)->activate = example_app_activate;
   G_APPLICATION_CLASS (class)->open = example_app_open;
+  GTK_APPLICATION_CLASS (class)->create_window = example_app_create_window;
 }
 
 ExampleApp *
@@ -103,5 +105,7 @@ example_app_new (void)
   return g_object_new (EXAMPLE_APP_TYPE,
                        "application-id", "org.gtk.exampleapp",
                        "flags", G_APPLICATION_HANDLES_OPEN,
+                       "register-session", TRUE,
+                       "save-state", TRUE,
                        NULL);
 }
diff --git a/examples/application9/exampleappwin.c b/examples/application9/exampleappwin.c
index 0edfa2cea1..1283405b21 100644
--- a/examples/application9/exampleappwin.c
+++ b/examples/application9/exampleappwin.c
@@ -17,6 +17,8 @@ struct _ExampleAppWindow
   GtkWidget *words;
   GtkWidget *lines;
   GtkWidget *lines_label;
+
+  GList *files;
 };
 
 G_DEFINE_TYPE (ExampleAppWindow, example_app_window, GTK_TYPE_APPLICATION_WINDOW)
@@ -211,14 +213,68 @@ example_app_window_dispose (GObject *object)
 
   g_clear_object (&win->settings);
 
+  g_list_free_full (win->files, g_object_unref);
+  win->files = NULL;
+
   G_OBJECT_CLASS (example_app_window_parent_class)->dispose (object);
 }
 
+static gboolean
+example_app_window_save_state (GtkWidget    *widget,
+                               GVariantDict *dict,
+                               gboolean     *save_children)
+{
+  ExampleAppWindow *win = EXAMPLE_APP_WINDOW (widget);
+  GVariantBuilder builder;
+
+  g_variant_builder_init (&builder, G_VARIANT_TYPE ("as"));
+  for (GList *l = win->files; l; l = l->next)
+    {
+      g_variant_builder_add (&builder, "s", g_file_peek_path (G_FILE (l->data)));
+    }
+
+  g_variant_dict_insert_value (dict, "files", g_variant_builder_end (&builder));
+
+  /* Save window state */
+  GTK_WIDGET_CLASS (example_app_window_parent_class)->save_state (widget, dict, save_children);
+
+  *save_children = TRUE;
+  return TRUE;
+}
+
+static gboolean
+example_app_window_restore_state (GtkWidget *widget,
+                                  GVariant  *state)
+{
+  ExampleAppWindow *win = EXAMPLE_APP_WINDOW (widget);
+  GVariantIter *iter;
+
+  /* Restore window state */
+  GTK_WIDGET_CLASS (example_app_window_parent_class)->restore_state (widget, state);
+
+  if (g_variant_lookup (state, "files", "as", &iter))
+    {
+       const char *path;
+
+       while (g_variant_iter_next (iter, "&s", &path))
+         {
+           GFile *file = g_file_new_for_path (path);
+           example_app_window_open (win, file);
+           g_object_unref (file);
+         }
+    }
+
+  return TRUE;
+}
+
 static void
 example_app_window_class_init (ExampleAppWindowClass *class)
 {
   G_OBJECT_CLASS (class)->dispose = example_app_window_dispose;
 
+  GTK_WIDGET_CLASS (class)->save_state = example_app_window_save_state;
+  GTK_WIDGET_CLASS (class)->restore_state = example_app_window_restore_state;
+
   gtk_widget_class_set_template_from_resource (GTK_WIDGET_CLASS (class),
                                                "/org/gtk/exampleapp/window.ui");
 
@@ -288,4 +344,6 @@ example_app_window_open (ExampleAppWindow *win,
 
   update_words (win);
   update_lines (win);
+
+  win->files = g_list_append (win->files, g_object_ref (file));
 }
diff --git a/examples/application9/window.ui b/examples/application9/window.ui
index b0f9932b03..1c0d07cc95 100644
--- a/examples/application9/window.ui
+++ b/examples/application9/window.ui
@@ -4,6 +4,7 @@
     <property name="title" translatable="yes">Example Application</property>
     <property name="default-width">600</property>
     <property name="default-height">400</property>
+    <property name="save-id">window</property>
     <child type="titlebar">
       <object class="GtkHeaderBar" id="header">
         <child>
@@ -26,6 +27,7 @@
           <object class="GtkToggleButton" id="search">
             <property name="sensitive">0</property>
             <property name="icon-name">edit-find-symbolic</property>
+            <property name="save-id">search</property>
           </object>
         </child>
         <child type="end">
@@ -38,6 +40,7 @@
     <child>
       <object class="GtkBox" id="content_box">
         <property name="orientation">vertical</property>
+        <property name="save-id">content_box</property>
         <child>
           <object class="GtkSearchBar" id="searchbar">
             <child>
@@ -49,8 +52,10 @@
         </child>
         <child>
           <object class="GtkBox" id="hbox">
+            <property name="save-id">hbox</property>
             <child>
               <object class="GtkRevealer" id="sidebar">
+                <property name="save-id">sidebar</property>
                 <property name="transition-type">slide-right</property>
                 <child>
                   <object class="GtkScrolledWindow" id="sidebar-sw">
@@ -66,6 +71,7 @@
             </child>
             <child>
               <object class="GtkStack" id="stack">
+                <property name="save-id">stack</property>
                 <signal name="notify::visible-child" handler="visible_child_changed"/>
               </object>
             </child>