<?php
/**
* Start the script and use <Tab> key to cycle the focus
* through the buttons. You will see the label of the focused
* button be echoed to the console every second.
* Also try to activate another window while the script is
* running.
*/
 
$wnd  = new GtkWindow();
$vbox = new GtkVBox();
 
//Create ten buttons we can focus with <Tab>
for ($nA = 1; $nA <= 10; $nA++) {
    $button = new GtkButton('Button ' . $nA);
    $vbox->add($button);
}
 
/**
* This method will write the label of the current
* focused widget to the console
* It returns true, so that the interval doesn't stop
*/
function echoFocusedLabel($wnd)
{
    //get_focus() returns the widget
    if ($wnd->get_focus()->flags() & Gtk::HAS_FOCUS) {
        $focus = 'focus is set';
    } else {
        $focus = 'focus is NOT set (window not focused?)';
    }
    echo $wnd->get_focus()->get_label() . ' - ' . $focus . "\r\n";
    return true;
}
 
//add a timeout of one second, so that the echoFocusedLabel
//method will echo the label of the focused widget every second
Gtk::timeout_add(1000, 'echoFocusedLabel', $wnd);
 
$wnd->add($vbox);
$wnd->connect_simple('destroy', array('gtk', 'main_quit'));
$wnd->show_all();
Gtk::main();
?>