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Actions and signals

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

Declare HelloWorld as a new Lang class. Gjs requires classes to have the Name property defined.

const HelloWorld = new Lang.Class({
    Name: 'HelloWorld',

_init is called when a new instance is created. Create a GtkApplication, then connect activate to the existing Gtk event _onActivate and startup to _onStartup:

    _init: function() {
        this.application = new Gtk.Application();
        this.application.connect('activate', Lang.bind(this, this._onActivate));
        this.application.connect('startup', Lang.bind(this, this._onStartup));
    },

Show the window upon application activation:

    _onActivate: function(){
        this._window.show_all();
    },
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