Current File : //usr/share/doc/gjs/examples/gtk4.js
// SPDX-License-Identifier: MIT OR LGPL-2.0-or-later
// SPDX-FileCopyrightText: 2008 litl, LLC
// Include the version in case both GTK3 and GTK4 installed
// otherwise an exception will be thrown
import Gtk from 'gi://Gtk?version=4.0';
import GLib from 'gi://GLib';
// Initialize Gtk before you start calling anything from the import
Gtk.init();
// If you are not using GtkApplication which has its own mainloop
// you must create it yourself, see gtk-application.js example
let loop = GLib.MainLoop.new(null, false);
// Construct a window
let win = new Gtk.Window({
title: 'A default title',
default_width: 300,
default_height: 250,
});
// Object properties can also be set or changed after construction, unless they
// are marked construct-only.
win.title = 'Hello World!';
// This is a callback function
function onCloseRequest() {
log('close-request emitted');
loop.quit();
}
// When the window is given the "close-request" signal (this is given by the
// window manager, usually by the "close" option, or on the titlebar), we ask
// it to call the onCloseRequest() function as defined above.
win.connect('close-request', onCloseRequest);
// Create a button to close the window
let button = new Gtk.Button({
label: 'Close the Window',
// An example of how constants are mapped:
// 'Gtk' and 'Align' are taken from the GtkAlign enum,
// 'CENTER' from the constant GTK_ALIGN_CENTER
valign: Gtk.Align.CENTER,
halign: Gtk.Align.CENTER,
});
// Connect to the 'clicked' signal, using another way to call an arrow function
button.connect('clicked', () => win.close());
// Add the button to the window
win.set_child(button);
// Show the window
win.present();
// Control will end here and wait for an event to occur
// (like a key press or mouse event)
// The main loop will run until loop.quit is called.
loop.run();
log('The main loop has completed.');
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