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-rwxr-xr-xvala.html.markdown23
1 files changed, 23 insertions, 0 deletions
diff --git a/vala.html.markdown b/vala.html.markdown
index a0fbc5c1..237d4a15 100755
--- a/vala.html.markdown
+++ b/vala.html.markdown
@@ -279,6 +279,29 @@ public class Calculator : GLib.Object {
var calc1 = new Calculator.with_name("Temp");
var calc2 = new Calculator.model("TI-84");
+// Signals (a.k.a. events or event listeners) are a way to execute multiple
+// methods with the same signature at the same time.
+
+public class SignalDemo : GLib.Object {
+ public signal void sig_demo(int sig_demo_int); // Must be public
+
+ public static int main(string[] args) {
+ // main method; program does not compile without it
+ var sig_demo_class = new SignalDemo(); // New instance of class
+
+ sig_demo_class.sig_demo.connect((ob, sig_int) => { // Lambda used as handler
+ stdout.printf("%d\n", sig_int); // "ob" is object on which it is emitted
+ });
+
+ sig_demo_class.sig_demo(27); // Signal is emitted
+
+ return 0;
+ }
+}
+
+// You may use the connect() method and attach as many handlers as you'd like.
+// They'll all run when the signal is emitted.
+
```
* More Vala documentation can be found [here](https://valadoc.org/).
* Read about building GUIs with GTK+ and Vala [here](http://archive.is/7C7bw).