[gtk/wip/otte/whatever: 5/5] gtk-demo: Add a listview demo for filtering strings

[Benjamin Otte <otte src gnome org>]

commit 8d97af5276692af763ffb566c68c387bfe61742b
Author: Benjamin Otte <otte redhat com>
Date:   Sat Jun 27 06:38:20 2020 +0200

    gtk-demo: Add a listview demo for filtering strings

 demos/gtk-demo/demo.gresource.xml |   1 +
 demos/gtk-demo/listview_words.c   | 112 ++++++++++++++++++++++++++++++++++++++
 demos/gtk-demo/meson.build        |   1 +
 3 files changed, 114 insertions(+)
---
diff --git a/demos/gtk-demo/demo.gresource.xml b/demos/gtk-demo/demo.gresource.xml
index f547947245..0500c75034 100644
--- a/demos/gtk-demo/demo.gresource.xml
+++ b/demos/gtk-demo/demo.gresource.xml
@@ -225,6 +225,7 @@
     <file>listview_minesweeper.c</file>
     <file>listview_settings.c</file>
     <file>listview_weather.c</file>
+    <file>listview_words.c</file>
     <file>list_store.c</file>
     <file>markup.c</file>
     <file>modelbutton.c</file>
diff --git a/demos/gtk-demo/listview_words.c b/demos/gtk-demo/listview_words.c
new file mode 100644
index 0000000000..7966d0ceb6
--- /dev/null
+++ b/demos/gtk-demo/listview_words.c
@@ -0,0 +1,112 @@
+/* Lists/Words
+ *
+ * This demo shows filtering a long list - of words.
+ *
+ * You should have the file `/usr/share/dict/words` installed for
+ * this demo to work.
+ */
+
+#include <gtk/gtk.h>
+
+static GtkWidget *window = NULL;
+
+const char *factory_text =
+"<?xml version='1.0' encoding='UTF-8'?>\n"
+"<interface>\n"
+"  <template class='GtkListItem'>\n"
+"    <property name='child'>\n"
+"      <object class='GtkLabel'>\n"
+"        <binding name='label'>\n"
+"          <lookup name='string' type='GtkStringObject'>\n"
+"            <lookup name='item'>GtkListItem</lookup>\n"
+"          </lookup>\n"
+"        </binding>\n"
+"      </object>\n"
+"    </property>\n"
+"  </template>\n"
+"</interface>\n";
+
+static void
+update_title_cb (GListModel *model,
+                 guint       position,
+                 guint       removed,
+                 guint       added,
+                 GtkWindow  *win)
+{
+  char *title;
+
+  title = g_strdup_printf ("%u Words\n", g_list_model_get_n_items (model));
+  gtk_window_set_title (win, title);
+  g_free (title);
+}
+
+GtkWidget *
+do_listview_words (GtkWidget *do_widget)
+{
+  if (window == NULL)
+    {
+      GtkWidget *header, *listview, *sw, *vbox, *search_entry;
+      GtkFilterListModel *filter_model;
+      GtkStringList *stringlist;
+      GtkFilter *filter;
+      char **words;
+      char *usr_dict_words;
+      GtkExpression *expression;
+
+      if (g_file_get_contents ("/usr/share/dict/words", &usr_dict_words, NULL, NULL))
+        {
+          words = g_strsplit (usr_dict_words, "\n", -1);
+          g_free (usr_dict_words);
+        }
+      else
+        {
+          words = g_strsplit ("lorem ipsum dolor sit amet consectetur adipisci elit sed eiusmod tempor 
incidunt labore et dolore magna aliqua ut enim ad minim veniam quis nostrud exercitation ullamco laboris nisi 
ut aliquid ex ea commodi consequat", " ", -1);
+        }
+      stringlist = gtk_string_list_new ((const char **) words);
+      g_strfreev (words);
+
+      filter = gtk_string_filter_new ();
+      expression = gtk_property_expression_new (GTK_TYPE_STRING_OBJECT, NULL, "string");
+      gtk_string_filter_set_expression (GTK_STRING_FILTER (filter), expression);
+      gtk_expression_unref (expression);
+      filter_model = gtk_filter_list_model_new (G_LIST_MODEL (stringlist), filter);
+
+      window = gtk_window_new ();
+      gtk_window_set_title (GTK_WINDOW (window), "Words");
+      header = gtk_header_bar_new ();
+      gtk_header_bar_set_show_title_buttons (GTK_HEADER_BAR (header), TRUE);
+      gtk_window_set_titlebar (GTK_WINDOW (window), header);
+
+      gtk_window_set_display (GTK_WINDOW (window),
+                              gtk_widget_get_display (do_widget));
+      g_object_add_weak_pointer (G_OBJECT (window), (gpointer*)&window);
+
+      vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
+      gtk_window_set_child (GTK_WINDOW (window), vbox);
+
+      search_entry = gtk_search_entry_new ();
+      g_object_bind_property (search_entry, "text", filter, "search", 0);
+      gtk_box_append (GTK_BOX (vbox), search_entry);
+
+      sw = gtk_scrolled_window_new ();
+      gtk_box_append (GTK_BOX (vbox), sw);
+
+      listview = gtk_list_view_new_with_factory (
+          gtk_builder_list_item_factory_new_from_bytes (NULL,
+              g_bytes_new_static (factory_text, strlen (factory_text))));
+      gtk_scrolled_window_set_child (GTK_SCROLLED_WINDOW (sw), listview);
+      gtk_list_view_set_model (GTK_LIST_VIEW (listview), G_LIST_MODEL (filter_model));
+
+      g_signal_connect (filter_model, "items-changed", G_CALLBACK (update_title_cb), window);
+      update_title_cb (G_LIST_MODEL (filter_model), 0, 0, 0, GTK_WINDOW (window));
+
+      g_object_unref (filter_model);
+    }
+
+  if (!gtk_widget_get_visible (window))
+    gtk_widget_show (window);
+  else
+    gtk_window_destroy (GTK_WINDOW (window));
+
+  return window;
+}
diff --git a/demos/gtk-demo/meson.build b/demos/gtk-demo/meson.build
index eb6513591b..0b419edb21 100644
--- a/demos/gtk-demo/meson.build
+++ b/demos/gtk-demo/meson.build
@@ -49,6 +49,7 @@ demos = files([
   'listview_minesweeper.c',
   'listview_settings.c',
   'listview_weather.c',
+  'listview_words.c',
   'markup.c',
   'modelbutton.c',
   'overlay.c',