A button widget connected to a progress bar, inside of a grid which handles the layout.
#!/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 GridExample {
/* Create the application itself
This boilerplate code is needed to build any GTK+ application. */
constructor() {
this.application = new Gtk.Application ({
application_id: 'org.example.jsgrid',
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: "Grid Example"});
// Create the grid
this.Grid = new Gtk.Grid ();
// Create the widgets inside the grid
this.progressBar = new Gtk.ProgressBar ();
this.Button = new Gtk.Button ({ label: "Button" });
this.Button.connect ("clicked", this._clickHandler.bind(this));
// Assemble the grid
this._window.add (this.Grid);
this.Grid.attach (this.Button, 1, 1, 1, 1);
this.Grid.attach_next_to (this.progressBar, this.Button, Gtk.PositionType.BOTTOM, 1, 1);
// 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.progressBar.pulse ();
}
};
// Run the application
let app = new GridExample ();
app.application.run (ARGV);
In this sample we used the following:
Gtk.Application
Gtk.ApplicationWindow
Gtk.Button
Gtk.Grid
Gtk.ProgressBar