488. How to always open an application on the second monitor?

Problem

Suppose you have two monitors.

You would like your PHP-GTK application to always open on the second monitor as shown below:

How to always open an application on the second monitor?


Solution


Sample Code

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<?php
$window = new GtkWindow();
$window->set_title($argv[0]);
$window->set_size_request(400, 200);
$window->connect('delete-event', 'on_delete_event'); // note 4
$window->connect_simple('destroy', array('Gtk','main_quit'));
$window->add($vbox = new GtkVBox());

$title = new GtkLabel("Always open an application on the second monitor");
$title->modify_font(new PangoFontDescription("Times New Roman Italic 10"));
$title->modify_fg(Gtk::STATE_NORMAL, GdkColor::parse("#0000ff"));
$vbox->pack_start($title);
$vbox->pack_start(new GtkLabel(''));

$vbox->pack_start(new GtkLabel('Run the application, drag the application to the second monitor'));
$vbox->pack_start(new GtkLabel('Exit the application by clicking the button below.'));
$vbox->pack_start(new GtkLabel('Then run this application again.'));
$vbox->pack_start(new GtkLabel('The application will now always open at the second monitor!'));

$vbox->pack_start(new GtkLabel(), 0);
$vbox->pack_start($hbox = new GtkHBox(), 0);
$button = new GtkButton('Exit Application');
$button->connect('clicked', 'on_click');
$hbox->pack_start(new GtkLabel());
$hbox->pack_start($button, 0);
$hbox->pack_start(new GtkLabel());
$vbox->pack_start(new GtkLabel(), 0);

$window->show_all();
Gtk::idle_add('move_to_last_pos');
Gtk::main();

function on_click($button) {
    save_window_position();
    Gtk::main_quit();
}

function on_delete_event($window) {
    save_window_position();
}

function save_window_position() {
    global $window;
    print "save_window_position!\n";
    file_put_contents('last_pos.txt', implode("\t", 
        $window->get_position())); // note 1
}

function move_to_last_pos() {
    if (file_exists('last_pos.txt')) {
        $pos = file_get_contents('last_pos.txt'); // note 2
        list($x, $y) = explode("\t", $pos);
        global $window;
        echo "move to: $x ($y)\n";
        $window->move($x, $y); // note 3
    }
}

?>

Output

As shown above.
 

Explanation

  1. Save a copy of the position of the application window in the file last_pos.txt.
  2. Retrieve the last saved position.
  3. Move to the last saved position.
  4. This one takes care of the case when the user tries to exit the application by closing the window.

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