[gtk/state-saving: 12/14] Add a state-saving test

[Matthias Clasen <matthiasc src gnome org>]

commit 7e8dfd5bda1b9f20c3bd5d78c1ba3c8fb7ecde6b
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Jun 2 22:09:07 2021 -0400

    Add a state-saving test

 tests/meson.build    |   1 +
 tests/state-saving.c | 246 +++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 247 insertions(+)
---
diff --git a/tests/meson.build b/tests/meson.build
index b548db4e7a..9d98775ffb 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -1,5 +1,6 @@
 gtk_tests = [
   # testname, optional extra sources
+  ['state-saving'],
   ['testpopup'],
   ['testupload'],
   ['testtransform'],
diff --git a/tests/state-saving.c b/tests/state-saving.c
new file mode 100644
index 0000000000..1404b4a669
--- /dev/null
+++ b/tests/state-saving.c
@@ -0,0 +1,246 @@
+/* state-saving.c
+ * Copyright (C) 2021 Red Hat, Inc
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <gtk/gtk.h>
+
+
+static void
+quit_cb (GtkWidget *widget,
+         gpointer   data)
+{
+  gboolean *done = data;
+
+  *done = TRUE;
+
+  g_main_context_wakeup (NULL);
+}
+
+static void
+save_cb (GtkWidget *window)
+{
+  GVariant *state;
+  char *s;
+  GError *error = NULL;
+
+  state = gtk_widget_save_state (window);
+  if (!state)
+    {
+      g_print ("no state\n");
+      return;
+    }
+
+  s = g_variant_print (state, TRUE);
+  g_print ("%s\n", s);
+  g_free (s);
+
+  if (!g_file_set_contents ("saved-state",
+                            g_variant_get_data (state),
+                            g_variant_get_size (state),
+                            &error))
+    {
+      g_error ("Failed to save state: %s", error->message);
+      g_error_free (error);
+    }
+
+  g_variant_unref (state);
+}
+
+static void
+restore_cb (GtkWidget *window)
+{
+  char *contents;
+  gsize len;
+  GError *error = NULL;
+  GVariant *state;
+
+  if (!g_file_get_contents ("saved-state", &contents, &len, &error))
+    {
+      g_print ("Error loading state: %s\n", error->message);
+      g_error_free (error);
+      return;
+    }
+
+  state = g_variant_new_from_data (G_VARIANT_TYPE_VARDICT, contents, len, FALSE, NULL, NULL);
+  gtk_widget_restore_state (window, state);
+  g_variant_unref (state);
+}
+
+static void
+add_to_list (GtkWidget *list)
+{
+  GtkWidget *entry;
+  int i;
+  char *s;
+  GtkWidget *w;
+
+  entry = gtk_entry_new ();
+
+  gtk_widget_set_save_id (entry, "entry");
+  gtk_list_box_append (GTK_LIST_BOX (list), entry);
+
+  for (i = 0, w = gtk_widget_get_first_child (list);
+       w;
+       w = gtk_widget_get_next_sibling (w)) i++;
+
+  s = g_strdup_printf ("item%d", i);
+  gtk_widget_set_save_id (gtk_widget_get_parent (entry), s);
+  g_free (s);
+}
+
+static gboolean
+save_list (GtkWidget    *list,
+           GVariantDict *dict,
+           gboolean     *save_children,
+           gpointer      data)
+{
+  int n_items;
+  GtkWidget *w;
+
+  for (n_items = 0, w = gtk_widget_get_first_child (list);
+       w;
+       w = gtk_widget_get_next_sibling (w)) n_items++;
+
+  g_variant_dict_insert (dict, "n-items", "i", n_items);
+  *save_children =  TRUE;
+
+  return FALSE;
+}
+
+static gboolean
+restore_list (GtkWidget *list,
+              GVariant  *data)
+{
+  int n_items;
+
+  if (g_variant_lookup (data, "n-items", "i", &n_items))
+    {
+      for (int i = 0; i < n_items; i++)
+        add_to_list (list);
+    }
+
+  return FALSE;
+}
+
+int
+main (int argc, char *argv[])
+{
+  GtkWidget *window, *box, *hbox, *button, *scale;
+  GtkWidget *entry, *cc, *sw, *stack, *switcher;
+  GtkWidget *list;
+  gboolean done = FALSE;
+
+  gtk_init ();
+
+  window = gtk_window_new ();
+  gtk_widget_set_save_id (window, "window");
+
+  gtk_window_set_title (GTK_WINDOW (window), "hello world");
+  gtk_window_set_resizable (GTK_WINDOW (window), FALSE);
+  g_signal_connect (window, "destroy", G_CALLBACK (quit_cb), &done);
+
+  box = gtk_box_new (GTK_ORIENTATION_VERTICAL, 10);
+  gtk_widget_set_save_id (box, "box");
+
+  stack = gtk_stack_new ();
+  gtk_widget_set_save_id (stack, "stack");
+  switcher = gtk_stack_switcher_new ();
+  gtk_stack_switcher_set_stack (GTK_STACK_SWITCHER (switcher), GTK_STACK (stack));
+
+  gtk_box_append (GTK_BOX (box), switcher);
+  gtk_box_append (GTK_BOX (box), stack);
+
+  hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);
+  gtk_box_append (GTK_BOX (box), hbox);
+
+  button = gtk_button_new_with_label ("Save");
+  gtk_widget_set_hexpand (button, TRUE);
+  g_signal_connect_swapped (button, "clicked", G_CALLBACK (save_cb), window);
+  gtk_box_append (GTK_BOX (hbox), button);
+
+  button = gtk_button_new_with_label ("Restore");
+  gtk_widget_set_hexpand (button, TRUE);
+  g_signal_connect_swapped (button, "clicked", G_CALLBACK (restore_cb), window);
+  gtk_box_append (GTK_BOX (hbox), button);
+
+  gtk_window_set_child (GTK_WINDOW (window), box);
+
+  box = gtk_box_new (GTK_ORIENTATION_VERTICAL, 10);
+  gtk_widget_set_save_id (box, "box");
+
+  scale = gtk_scale_new_with_range (GTK_ORIENTATION_HORIZONTAL, 0, 100, 1);
+  gtk_widget_set_save_id (scale, "scale");
+  gtk_box_append (GTK_BOX (box), scale);
+
+  entry = gtk_entry_new ();
+  gtk_widget_set_save_id (entry, "entry");
+  gtk_box_append (GTK_BOX (box), entry);
+
+  cc = gtk_color_chooser_widget_new ();
+  gtk_widget_set_save_id (cc, "color");
+  gtk_box_append (GTK_BOX (box), cc);
+
+  hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);
+  gtk_widget_set_save_id (hbox, "hbox");
+  gtk_box_append (GTK_BOX (box), hbox);
+
+  sw = gtk_switch_new ();
+  gtk_widget_set_save_id (sw, "switch");
+  gtk_widget_set_valign (sw, GTK_ALIGN_CENTER);
+  gtk_box_append (GTK_BOX (hbox), sw);
+
+  button = gtk_check_button_new_with_label ("Check");
+  gtk_widget_set_save_id (button, "check");
+  gtk_box_append (GTK_BOX (hbox), button);
+
+  button = gtk_toggle_button_new_with_label ("Toggle");
+  gtk_widget_set_save_id (button, "toggle");
+  gtk_box_append (GTK_BOX (hbox), button);
+
+  entry = gtk_spin_button_new_with_range (0, 100, 1);
+  gtk_widget_set_save_id (entry, "spin");
+  gtk_box_append (GTK_BOX (hbox), entry);
+
+  entry = gtk_password_entry_new ();
+  gtk_password_entry_set_show_peek_icon (GTK_PASSWORD_ENTRY (entry), TRUE);
+  gtk_widget_set_save_id (entry, "password");
+  gtk_box_append (GTK_BOX (box), entry);
+
+  gtk_stack_add_titled (GTK_STACK (stack), box, "page1", "Page 1");
+
+  box = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
+  gtk_widget_set_save_id (box, "box2");
+
+  list = gtk_list_box_new ();
+  gtk_widget_set_save_id (list, "list");
+  g_signal_connect (list, "save-state", G_CALLBACK (save_list), NULL);
+  g_signal_connect (list, "restore-state", G_CALLBACK (restore_list), NULL);
+
+  button = gtk_button_new_with_label ("Add");
+  g_signal_connect_swapped (button, "clicked", G_CALLBACK (add_to_list), list);
+
+  gtk_box_append (GTK_BOX (box), button);
+  gtk_box_append (GTK_BOX (box), list);
+
+  gtk_stack_add_titled (GTK_STACK (stack), box, "page2", "Page 2");
+
+  gtk_widget_show (window);
+
+  while (!done)
+    g_main_context_iteration (NULL, TRUE);
+
+  return 0;
+}