more Vala examples

vala/hello/interfaces.vala

@@ -0,0 +1,23 @@
+interface IfaceA : Object {
+    public abstract void method_a ();
+}
+
+interface IfaceB : Object, IfaceA {
+    public abstract void method_b ();
+}
+
+class Demo : Object, IfaceA, IfaceB {
+    public void method_a () { stdout.printf ("a called\n"); }
+    public void method_b () { stdout.printf ("b called\n"); }
+    public void method_c () { stdout.printf ("c called\n"); }
+
+    static int main ()
+      {
+        stdout.printf ("Hello world!\n");
+        var demo = new Demo ();
+        demo.method_a ();
+        demo.method_b ();
+        demo.method_c ();
+        return 0;
+      }
+}

vala/hello/lock.vala

@@ -0,0 +1,20 @@
+/* Vala Lock Example */
+using GLib;
+
+public class Sample : GLib.Object {
+
+        private int critical_data;
+
+        public void inc () {
+                
+                lock (critical_data) {
+                        critical_data++;
+                }
+        }
+
+        static void main (string[] args) {
+                
+                var sample = new Sample ();
+                sample.inc ();
+        }
+}

vala/hello/notify.vala

@@ -0,0 +1,10 @@
+public class Demo : Object {
+    public string title { get; set; }
+}
+
+void main () {
+    var demo = new Demo ();
+    demo.notify.connect ((s, p) => stdout.printf ("Property %s changed\n", p.name));
+    demo.title = "hello";
+    demo.title = "world";
+}

vala/hello/range_check.vala

@@ -0,0 +1,17 @@
+int main ()
+{
+  int[] a = {1, 2, 3};
+  double b = 5.33;
+  var s ="Hello, %s\n"; 
+
+  stdout.printf (s, b.to_string());
+
+  a[8] = 7;
+
+  foreach (int i in a)
+    {
+      stdout.printf ("%d\n", i);
+    }
+
+  return 0;
+}

vala/hello/signal.vala

@@ -0,0 +1,23 @@
+public class MyButton : Object {
+
+    public signal void clicked ();
+
+    public void test () {
+        clicked ();          // emit signal
+    }
+}
+
+void handler_c (MyButton source) {
+    stdout.printf ("handler C\n");
+}
+
+void main () {
+    var b = new MyButton ();
+    b.clicked.connect ((s) => stdout.printf ("handler A\n"));
+    b.clicked.connect ((s) => {
+        stdout.printf ("handler B\n");
+    });
+    b.clicked.connect (handler_c);
+    b.test ();
+    b.clicked.disconnect (handler_c);
+}

vala/hello/textviewer.vala

@@ -50,7 +50,8 @@ public class TextFileViewer : Window
         size_t size;
         FileUtils.get_contents( filename, out text, out size );
         this.text_view.buffer.set_text( text, (int) size );
-    } catch( Error e ) 
+      }
+    catch( Error e )
       {
         stderr.printf( "Ошибка: %s\n", e.message );
       }