// -*- mode: js; js-indent-level: 4; indent-tabs-mode: nil -*-

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: 'Show Keyboard' });
        this.actor.connect("clicked", Lang.bind(this, this._toggleShowOnScreenKeyboard));
        this._onScreenKeyboardShown = false;

        this._keyboardVisibleId = Main.layoutManager.connect('keyboard-visible-changed',
                                          Lang.bind(this,
                                                    this._onKeyboardVisibleChanged));
    },

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

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

    disable: function() {
        Main.layoutManager.connect(this._keyboardVisibleId);
        Main.panel._centerBox.remove_actor(_button.actor);
    },
};

let _button;

function init() {
    /* do nothing */
}

function enable() {
    _button = new OnScreenKeyboardButton();
    _button.enable();
}

function disable() {
    _button.disable();
}