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#!/usr/bin/gjs
imports.gi.versions.Gtk = '3.0';
const Gio = imports.gi.Gio;
const Gtk = imports.gi.Gtk;
class ScaleExample {
// Create the application itself
constructor() {
this.application = new Gtk.Application({
application_id: 'org.example.jsscale'
});
// 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 window when active
_onActivate() {
this._window.present();
}
// Callback function for 'startup' signal 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,
border_width: 20,
title: "Birds on a Floe"});
// Create the horizontal scale
this._hScale = Gtk.Scale.new_with_range (Gtk.Orientation.HORIZONTAL, 0.0, 100.0, 5.0);
this._hScale.set_valign (Gtk.Align.START);
this._hScale.set_value (50);
this._hScale.set_digits (0);
// this._hScale.set_draw_value (false);
// Create a master adjustment to use for the vertical (or any other) scale
this._adjustment = new Gtk.Adjustment ({
value: 95,
lower: 0,
upper: 100,
step_increment: 5,
page_increment: 10 });
// Create a vertical scale using the adjustment we just made
this._vScale = new Gtk.Scale ({
orientation: Gtk.Orientation.VERTICAL,
adjustment: this._adjustment,
digits: 0,
// draw_value: false,
margin_left: 10 });
// Create the label that shows the product of the two values
this._product = (this._hScale.get_value() * this._vScale.get_value());
this._label = new Gtk.Label ({
label: (String(this._product) + " penguins on the iceberg."),
height_request: 200,
width_request: 200,
wrap: true});
// Connect the two scales to functions which recalculate the label
this._hScale.connect ("value-changed", this._recalc.bind(this));
this._vScale.connect ("value-changed", this._recalc.bind(this));
// Create a grid to arrange things in
this._UIGrid = new Gtk.Grid ({
halign: Gtk.Align.CENTER,
valign: Gtk.Align.CENTER,
margin_top: 20,
margin_left: 20});
// Attach everything to the grid
this._UIGrid.attach (this._label, 0, 0, 1, 1);
this._UIGrid.attach (this._hScale, 0, 1, 1, 1);
this._UIGrid.attach (this._vScale, 1, 0, 1, 1);
// Add the grid to the window
this._window.add (this._UIGrid);
// Show the window and all child widgets
this._window.show_all();
}
_recalc() {
// Figure out what the product of the two scales' values is
var product = (this._hScale.get_value() * this._vScale.get_value());
// Create a blank comment line in case there isn't a silly comment to make
var comment = "";
// Make a silly comment based on the number of penguins
if (product > 9000) {
comment = "It's over 9000!";
}
else if (product < 1000 && product > 0) {
comment = "They're getting lonely.";
}
else if (product == 0) {
comment = "They're all gone ...";
}
else comment = "";
// Set ._label's new text
this._label.set_label (String (product) + " penguins on the iceberg. " + comment);
}
};
// Run the application
let app = new ScaleExample ();
app.application.run (ARGV);
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