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| Kiosk Application Template #3 |
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This is the third template of the kiosk application template series.
This produces exactly the same output as the second template. The only difference it's re-written using classes, or object-oriented programming.
As you can see from the codes below, the login and the main application are now neatly encapsulated into each of its own class. This makes it much easier and better for maintenance and debugging.
The Code
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| <?php
define('MAX_USAGE', 30); // max usage time = 30 min
define('INACTIVITY', 10); // auto logout after 10 min of inactivity
$app = new KioskApp();
class KioskApp {
public function __construct() {
while(1) {
$login = new Login();
$login->login_success = 0;
while($login->login_success!=1) {
$login->go();
}
// starts the main program only if login successful
$main = new MainApp();
}
}
}
class MainApp {
protected $start_time; // start time
protected $last_activity; // time of last activity
protected $timeout_maxtime; // timeout_id for maxtime
protected $timeout_inactivity; // timeout_id for inactivity
protected $main_win; // main application window
public function __construct() {
$this->go();
}
public function go() {
$this->setup();
$this->main_win->run();
$this->main_win->destroy();
}
protected function setup() {
$dialog = new GtkDialog();
$dialog->fullscreen();
$eventbox = new GtkEventBox(); // note 1
$dialog->vbox->pack_start($eventbox); // note 1
$vbox = new GtkVBox();
$eventbox->add($vbox);
$vbox->pack_start(new GtkLabel());
// display title
$title = new GtkLabel("This is the main program");
$title->modify_font(new PangoFontDescription(
"Times New Roman Italic 10"));
$title->modify_fg(Gtk::STATE_NORMAL, GdkColor::parse("#0000ff"));
$title->set_size_request(-1, 40);
$vbox->pack_start($title, 0);
$vbox->pack_start(new GtkLabel("User verified"), 0);
$vbox->pack_start(new GtkLabel("Main application starts..."), 0);
$vbox->pack_start(new GtkLabel(
"Note: application will auto-logout after 30 min of usage"), 0);
$vbox->pack_start(new GtkLabel(
"or after 10 min of inactivity (i.e. no mouse or keyboard movement)"), 0);
$vbox->pack_start(new GtkLabel());
// sets up a logout button
$vbox->pack_start($hbox = new GtkHBox(), 0);
$hbox->pack_start(new GtkLabel());
$button = new GtkButton('Logout');
$hbox->pack_start($button, 0);
$button->connect('clicked', array(&$this, 'on_logout_button'));
// auto-logout after 30 minutes of usage
$this->start_time = time();
$this->timeout_maxtime =
Gtk::timeout_add(MAX_USAGE * 60 * 1000, array(&$this, 'logout'));
// check for inactivity
$this->last_activity = time();
$dialog->connect('key-press-event', array(&$this, 'on_keypress'));
$dialog->connect('button-press-event', array(&$this, 'on_buttonpress'));
$dialog->connect('motion-notify-event', array(&$this, 'on_motion'));
$this->timeout_inactivity = Gtk::timeout_add(1000,
array(&$this, 'check_inactivity'));
$dialog->set_has_separator(false);
$dialog->show_all();
$this->main_win = $dialog;
}
public function on_logout_button($button) {
$this->logout();
}
public function logout() {
Gtk::timeout_remove($this->timeout_maxtime);
Gtk::timeout_remove($this->timeout_inactivity);
$this->main_win->destroy();
}
function on_keypress($widget, $event) {
$this->last_activity = time(); // note 7
return false;
}
function on_motion($widget, $event) {
$this->last_activity = time(); // note 7
return false;
}
function on_buttonpress($widget, $event) {
$this->last_activity = time(); // note 7
return false;
}
function check_inactivity() {
$time_elapsed = time() - $this->last_activity;
if ($time_elapsed>INACTIVITY * 60 * 1000 ) { // note 8
echo "no activity. auto-logout...\n";
$this->logout(); // note 8
return false;
} else {
return true;
}
}
}
class Login {
protected $login_dialog; // the login dialog
public $login_success = 0; // flag to indicate whether login is successful
public function __construct() {
}
public function go() {
$this->setup();
$this->login_dialog->run();
$this->login_dialog->destroy();
}
// setup the login dialog
function setup() {
$dialog = new GtkDialog('Login', null, Gtk::DIALOG_MODAL);
$dialog->fullscreen();
$vbox = $dialog->vbox;
$vbox->pack_start(new GtkLabel());
// display title
$title = new GtkLabel("Login");
$title->modify_font(new PangoFontDescription(
"Times New Roman Italic 10"));
$title->modify_fg(Gtk::STATE_NORMAL, GdkColor::parse("#0000ff"));
$title->set_size_request(-1, 40);
$vbox->pack_start($title, 0, 0);
$field_labels = array("Username:", "Password:");
$table = new GtkTable();
$row = 0;
$input = array();
foreach ($field_labels as $field_label) {
$label = new GtkLabel($field_label);
$label->set_alignment(0,0);
$table->attach($label, 0, 1, $row, $row+1);
$input[$row] = new GtkEntry();
$table->attach($input[$row], 1, 2, $row, $row+1);
if (eregi("password", $field_label))
$input[$row]->set_visibility(false);
++$row;
}
$vbox->pack_start($hbox = new GtkHBox(), 0);
$vbox->pack_start(new GtkLabel());
$hbox->pack_start(new GtkLabel());
$hbox->pack_start($table, 0);
$hbox->pack_start(new GtkLabel());
$button_hbox = new GtkHBox();
$button_ok = GtkButton::new_from_stock(Gtk::STOCK_OK);
$button_ok->set_size_request(86, -1);
$button_hbox->pack_start($button_ok, 0);
$button_hbox->pack_start(new GtkLabel());
$table->attach($button_hbox, 1, 2, $row, $row+1);
++$row;
$status = new GtkLabel(' ');
$table->attach($status, 1, 2, $row, $row+1);
$button_ok->connect('clicked', array(&$this, 'on_button_ok'),
$input, $status);
$dialog->connect('key-press-event', array(&$this, 'on_key'),
$button_ok, $status);
$dialog->set_has_separator(false);
$dialog->show_all();
$this->login_dialog = $dialog;
}
public function on_button_ok($button, $input, $status) {
$username = $input[0]->get_text();
$passwd = $input[1]->get_text();
if ($username=='') {
$input[0]->grab_focus();
return true;
}
if ($passwd=='') {
$input[1]->grab_focus();
return true;
}
if ($username!='' && $passwd!='') {
if ($this->validate($username, $passwd)) {
$this->login_success = 1;
$this->login_dialog->destroy();
} else {
$status->set_text('invalid username/password');
}
}
}
protected function validate($username, $password) {
if ($username=='user1' && $password=='phpgtk2') {
return true;
} else {
return false;
}
}
function on_key($widget, $event, $button_ok, $status) {
$status->set_text('');
if ($event->keyval==Gdk::KEY_Return) {
$button_ok->clicked();
return true;
} else {
return false;
}
}
}
?>
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Explanation
Please refer to kiosk template #2.
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September 02, 2010 7:36am
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