Learning_GTK4_tree/demos/gtk-demo/listview_settings2.c

/* Lists/Alternative Settings
 * #Keywords: GtkListHeaderFactory, GtkSectionModel
 *
 * This demo shows an alternative settings viewer for GSettings.
 *
 * It demonstrates how to implement support for sections with GtkListView.
 *
 * It also shows how to quickly flatten a large tree of items into a list
 * that can be filtered to find the items one is looking for.
 */

#include <gtk/gtk.h>

#include "settings-key.h"

static void
item_value_changed (GtkEditableLabel  *label,
                    GParamSpec        *pspec,
                    GtkColumnViewCell *cell)
{
  SettingsKey *self;
  GSettingsSchemaKey *key;
  const char *text;
  const GVariantType *type;
  GVariant *variant;
  GError *error = NULL;
  const char *name;
  char *value;

  text = gtk_editable_get_text (GTK_EDITABLE (label));

  self = gtk_column_view_cell_get_item (cell);
  key = settings_key_get_key (self);

  type = g_settings_schema_key_get_value_type (key);
  name = g_settings_schema_key_get_name (key);

  variant = g_variant_parse (type, text, NULL, NULL, &error);
  if (!variant)
    {
      g_warning ("%s", error->message);
      g_clear_error (&error);
      goto revert;
    }

  if (!g_settings_schema_key_range_check (key, variant))
    {
      g_warning ("Not a valid value for %s", name);
      goto revert;
    }

  g_settings_set_value (settings_key_get_settings (self), name, variant);
  g_variant_unref (variant);
  return;

revert:
  gtk_widget_error_bell (GTK_WIDGET (label));

  g_object_get (self, "value", &value, NULL);
  gtk_editable_set_text (GTK_EDITABLE (label), value);
  g_free (value);
}

static int
strvcmp (gconstpointer p1,
         gconstpointer p2)
{
  const char * const *s1 = p1;
  const char * const *s2 = p2;

  return strcmp (*s1, *s2);
}

static gpointer
map_settings_to_keys (gpointer item,
                      gpointer unused)
{
  GSettings *settings = item;
  GSettingsSchema *schema;
  GListStore *store;
  char **keys;
  guint i;

  g_object_get (settings, "settings-schema", &schema, NULL);

  store = g_list_store_new (SETTINGS_TYPE_KEY);

  keys = g_settings_schema_list_keys (schema);

  for (i = 0; keys[i] != NULL; i++)
    {
      GSettingsSchemaKey *almost_there = g_settings_schema_get_key (schema, keys[i]);
      SettingsKey *finally = settings_key_new (settings, almost_there);
      g_list_store_append (store, finally);
      g_object_unref (finally);
      g_settings_schema_key_unref (almost_there);
    }

  g_strfreev (keys);
  g_settings_schema_unref (schema);
  g_object_unref (settings);

  return store;
}

static GListModel *
create_settings_model (gpointer item,
                       gpointer unused)
{
  GSettings *settings = item;
  char **schemas;
  GListStore *result;
  guint i;

  if (settings == NULL)
    {
      g_settings_schema_source_list_schemas (g_settings_schema_source_get_default (),
                                             TRUE,
                                             &schemas,
                                             NULL);
    }
  else
    {
      schemas = g_settings_list_children (settings);
    }

  if (schemas == NULL || schemas[0] == NULL)
    {
      g_free (schemas);
      return NULL;
    }

  qsort (schemas, g_strv_length (schemas), sizeof (char *), strvcmp);

  result = g_list_store_new (G_TYPE_SETTINGS);
  for (i = 0;  schemas[i] != NULL; i++)
    {
      GSettings *child;

      if (settings == NULL)
        child = g_settings_new (schemas[i]);
      else
        child = g_settings_get_child (settings, schemas[i]);

      g_list_store_append (result, child);
      g_object_unref (child);
    }

  g_strfreev (schemas);

  return G_LIST_MODEL (result);
}

static void
search_enabled (GtkSearchEntry *entry)
{
  gtk_editable_set_text (GTK_EDITABLE (entry), "");
}

static void
stop_search (GtkSearchEntry *entry,
             gpointer data)
{
  gtk_editable_set_text (GTK_EDITABLE (entry), "");
}

static GtkWidget *window = NULL;

GtkWidget *
do_listview_settings2 (GtkWidget *do_widget)
{
  if (window == NULL)
    {
      GtkListView *listview;
      GListModel *model;
      GtkTreeListModel *treemodel;
      GtkNoSelection *selection;
      GtkBuilderScope *scope;
      GtkBuilder *builder;
      GError *error = NULL;
      GtkFilter *filter;

      g_type_ensure (SETTINGS_TYPE_KEY);

      scope = gtk_builder_cscope_new ();
      gtk_builder_cscope_add_callback (scope, search_enabled);
      gtk_builder_cscope_add_callback (scope, stop_search);
      gtk_builder_cscope_add_callback (scope, settings_key_get_search_string);
      gtk_builder_cscope_add_callback (scope, item_value_changed);

      builder = gtk_builder_new ();
      gtk_builder_set_scope (builder, scope);
      g_object_unref (scope);

      gtk_builder_add_from_resource (builder, "/listview_settings2/listview_settings2.ui", &error);
      g_assert_no_error (error);

      window = GTK_WIDGET (gtk_builder_get_object (builder, "window"));
      gtk_window_set_display (GTK_WINDOW (window),
                              gtk_widget_get_display (do_widget));
      g_object_add_weak_pointer (G_OBJECT (window), (gpointer *) &window);

      listview = GTK_LIST_VIEW (gtk_builder_get_object (builder, "listview"));
      filter = GTK_FILTER (gtk_builder_get_object (builder, "filter"));

      model = create_settings_model (NULL, NULL);
      treemodel = gtk_tree_list_model_new (model,
                                           TRUE,
                                           TRUE,
                                           create_settings_model,
                                           NULL,
                                           NULL);
      model = G_LIST_MODEL (gtk_map_list_model_new (G_LIST_MODEL (treemodel), map_settings_to_keys, NULL, NULL));
      model = G_LIST_MODEL (gtk_flatten_list_model_new (model));
      model = G_LIST_MODEL (gtk_filter_list_model_new (model, g_object_ref (filter)));
      selection = gtk_no_selection_new (model);

      gtk_list_view_set_model (GTK_LIST_VIEW (listview), GTK_SELECTION_MODEL (selection));
      g_object_unref (selection);

      g_object_unref (builder);
    }

  if (!gtk_widget_get_visible (window))
    gtk_widget_set_visible (window, TRUE);
  else
    gtk_window_destroy (GTK_WINDOW (window));

  return window;
}