gio-async added

vala/gio-async/gio-async.vala

@@ -0,0 +1,67 @@
+using Gtk;
+
+/**
+ * Loads the list of files in user's home directory and displays them
+ * in a GTK+ list view.
+ */
+class ASyncGIOSample : Window {
+
+    private ListStore model;
+
+    public ASyncGIOSample () {
+
+        // Set up the window
+        set_default_size (300, 200);
+        this.destroy.connect (Gtk.main_quit);
+
+        // Set up the list widget and its model
+        this.model = new ListStore (1, typeof (string));
+        var list = new TreeView.with_model (this.model);
+        list.insert_column_with_attributes (-1, "Filename",
+                                            new CellRendererText (), "text", 0);
+
+        // Put list widget into a scrollable area and add it to the window
+        var scroll = new ScrolledWindow (null, null);
+        scroll.set_policy (PolicyType.NEVER, PolicyType.AUTOMATIC);
+        scroll.add (list);
+        add (scroll);
+
+        // start file listing process
+        list_directory.begin ();
+    }
+
+    private async void list_directory () {
+        stdout.printf ("Start scanning home directory\n");
+        var dir = File.new_for_path (Environment.get_home_dir ());
+        try {
+            // asynchronous call, to get directory entries
+            var e = yield dir.enumerate_children_async (FileAttribute.STANDARD_NAME,
+                                                        0, Priority.DEFAULT);
+            while (true) {
+                // asynchronous call, to get entries so far
+                var files = yield e.next_files_async (10, Priority.DEFAULT);
+                if (files == null) {
+                    break;
+                }
+                // append the files found so far to the list
+                foreach (var info in files) {
+                    TreeIter iter;
+                    this.model.append (out iter);
+                    this.model.set (iter, 0, info.get_name ());
+                }
+            }
+        } catch (Error err) {
+            stderr.printf ("Error: list_files failed: %s\n", err.message);
+        }
+    }
+
+    static int main (string[] args) {
+        Gtk.init (ref args);
+
+        var demo = new ASyncGIOSample ();
+        demo.show_all ();
+
+        Gtk.main ();
+        return 0;
+    }
+}