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Extending widgets with PHP

Tue, 05/09/2006 - 10:24 — Marc Quinton

primitive widget

  • you need to extend GtkWidget
  • you need to write many methods
  • your constructor MUST NOT call parent::__construct, or you will have an error (Fatal error: Cannot instantiate abstract class) for primitive widgets (abstract ?) (GtkWidget),
<?php
# simple code fragment (need to be completed)
class PrimitiveWidget extends GtkWidget {
  function __construct() {
    # Fatal error: Cannot instantiate abstract class
    # PrimitiveWidget in line ... (__construct() line call)
    # parent::__construct();
  }
}

$w = new PrimitiveWidget();
?>

composite widget

  • you can extend from GtkVbox for example
  • constructor will have to create all needed objects,
  • no need to write many methods,
  • here is a working sample code :
<?php
class CompositeWidget extends GtkVbox {
  function __construct() {
    parent::__construct();
    $this->label = new GtkLabel('test composite widget');
    $this->add($this->label);
    $this->add(new GtkLabel('an other label'));
    $this->add(new GtkButton('Test me'));
    $this->set_border_width(10);
  }
}

$win = new GtkWindow();
$win->set_title('Composite Widget extension example');
$win->connect_simple('destroy', array('gtk', 'main_quit'));

$composite_widget = new CompositeWidget();

$vbox = new GtkVBox();
$win->add($vbox);

$vbox->pack_start($composite_widget, true);

$win->show_all();
Gtk::main();
?>

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