extension.js


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const Gio = imports.gi.Gio;
const Lang = imports.lang;
const St = imports.gi.St;
const Main = imports.ui.main;

const A11Y_APPLICATIONS_SCHEMA = 'org.gnome.desktop.a11y.applications';

function OnScreenKeyboardButton() {
    this._init();
}

OnScreenKeyboardButton.prototype = {
    _init: function() {
        this.actor = new St.Button ({ label: 'Keyboard' });
        this.actor.connect("clicked", Lang.bind(this, this._toggleShowOnScreenKeyboard));
        this._onScreenKeyboardShown = false;
    },

    _activateOnScreenKeyboard: function () {
        let settings = new Gio.Settings({ schema: A11Y_APPLICATIONS_SCHEMA });
        let key = 'screen-keyboard-enabled';

        if (!settings.get_boolean(key) &&
             settings.is_writable(key)) {
            settings.set_boolean(key, true);
        }
    },

    _toggleShowOnScreenKeyboard: function() {
        if (this._onScreenKeyboardShown) {
		this.actor.set_label("Show keyboard");
		Main.keyboard.hide();
        } else {
		this._activateOnScreenKeyboard();
		this.actor.set_label("Hide keyboard");
		Main.keyboard.show();
        }
        this._onScreenKeyboardShown = !this._onScreenKeyboardShown;
    },
};

let button;

function init() {
    button = new OnScreenKeyboardButton();
}

function enable() {
	let _children = Main.panel._centerBox.get_children();
        Main.panel._centerBox.insert_child_at_index(button.actor, _children.length - 1);
        Main.panel._centerBox.add(button.actor);
}

function disable() {
	Main.panel._centerBoxBox.remove_actor(button.actor);
}