<page xmlns="http://projectmallard.org/1.0/" xmlns:its="http://www.w3.org/2005/11/its" type="topic" style="task" id="tour-events" xml:lang="sl">

  <info>

    <link type="next" xref="tour-get_object"/>

    <revision version="0.1" date="2013-06-17" status="stub"/>

    <credit type="author copyright">

      <name>Ekaterina Gerasimova</name>

      <email its:translate="no">kittykat3756@gmail.com</email>

      <years>2013</years>

    </credit>

    <credit type="author copyright">

      <name>Gordon Hill</name>

      <email its:translate="no">caseyweederman@gmail.com</email>

      <years>2013</years>

    </credit>

    <include xmlns="http://www.w3.org/2001/XInclude" href="cc-by-sa-3-0.xml"/>

    <desc>Bind functions to events using Lang.</desc>

  </info>

  <title>Actions and signals</title>

  <links type="prevnext" style="top"/>

  <links type="series" style="floatend">

    <title>Get started with GNOME</title>

  </links>

  
Gtk has a set of predefined events that you can use in your application.

  <example>

    
Declare HelloWorld as a new class.

class HelloWorld {

]]>

    
constructor is called when a new instance is created. Create a

    GtkApplication, then connect activate to the

    existing Gtk event _onActivate and startup to

    _onStartup:

    constructor() {

        this.application = new Gtk.Application();

        this.application.connect('activate', this._onActivate.bind(this));

        this.application.connect('startup', this._onStartup.bind(this));

    }

]]>

    
Show the window upon application activation:

    _onActivate() {

        this._window.show_all();

    }

]]>

  </example>

  <links type="prevnext"/>

</page>