/usr/share/help/gl/gnome-devel-demos/button.js.page is in gnome-devel-docs 3.28.0-1.
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<page xmlns="http://projectmallard.org/1.0/" xmlns:its="http://www.w3.org/2005/11/its" xmlns:xi="http://www.w3.org/2001/XInclude" type="guide" style="task" id="button.js" xml:lang="gl">
<info>
<title type="text">Button (JavaScript)</title>
<link type="guide" xref="beginner.js#buttons"/>
<revision version="0.1" date="2012-04-19" status="draft"/>
<credit type="author copyright">
<name>Taryn Fox</name>
<email its:translate="no">jewelfox@fursona.net</email>
<years>2012</years>
</credit>
<desc>Un botón que pode conectarse a outros widgets</desc>
<mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
<mal:name>Fran Dieguez</mal:name>
<mal:email>frandieguez@gnome.org</mal:email>
<mal:years>2012-2013.</mal:years>
</mal:credit>
</info>
<title>Botón</title>
<media type="image" mime="image/png" src="media/button.png"/>
<p>A button widget that changes its label when you click it.</p>
<code mime="application/javascript" style="numbered">#!/usr/bin/gjs
imports.gi.versions.Gtk = '3.0';
const Gio = imports.gi.Gio;
const GLib = imports.gi.GLib;
const Gtk = imports.gi.Gtk;
class ButtonExample {
/* Create the application itself
This boilerplate code is needed to build any GTK+ application. */
constructor() {
this.application = new Gtk.Application ({
application_id: 'org.example.jsbutton',
flags: Gio.ApplicationFlags.FLAGS_NONE
});
// Connect 'activate' and 'startup' signals to the callback functions
this.application.connect('activate', this._onActivate.bind(this));
this.application.connect('startup', this._onStartup.bind(this));
}
// Callback function for 'activate' signal presents windows when active
_onActivate() {
this._window.present ();
}
// Callback function for 'startup' signal initializes menus and builds the UI
_onStartup() {
this._buildUI();
}
// Build the application's UI
_buildUI() {
// Create the application window
this._window = new Gtk.ApplicationWindow ({ application: this.application,
window_position: Gtk.WindowPosition.CENTER,
title: "GNOME Button",
default_height: 50,
default_width: 250 });
// Create the button
this.Button = new Gtk.Button ({label: "Click Me"});
this._window.add (this.Button);
// Bind it to a function that says what to do when the button is clicked
this.Button.connect ("clicked", this._clickHandler.bind(this));
// Show the window and all child widgets
this._window.show_all();
}
// Here's the function that says what happens when the button is clicked
_clickHandler() {
this.Button.set_label ("Clicked!");
}
};
// Run the application
let app = new ButtonExample ();
app.application.run (ARGV);
</code>
<p>Neste exemplo empregaremos o seguinte:</p>
<list>
<item><p><link href="http://www.roojs.com/seed/gir-1.2-gtk-3.0/gjs/Gtk.Application.html">Gtk.Application</link></p></item>
<item><p><link href="http://developer.gnome.org/gtk3/stable/GtkApplicationWindow.html">Gtk.ApplicationWindow</link></p></item>
<item><p><link href="http://www.roojs.com/seed/gir-1.2-gtk-3.0/gjs/Gtk.Button.html">Gtk.Button</link></p></item>
</list>
</page>
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