Extendable GTK classes support

[d47081]

I found interesting situation in app development.

To receive selected GtkNotebook Label, I'm using this construction:

        $this->gtk->connect(
            'switch-page',
            function (
                \GtkNotebook $entity,
                \GtkWidget $child,
                int $position
            ) {
                $label = $entity->get_tab_label(
                    $child
                );

                $this->container->browser->header->setTitle(
                    $label->get_text(),
                    $label->get_subtitle() // extended
                );
            }
        );

where $label->get_subtitle() is extra-feature implemented by GtkLabel extension class:

<?php

declare(strict_types=1);

namespace Yggverse\Yoda\Gtk\Browser\Container\Tab\Page\Title;

class Label extends \GtkLabel
{
    private string $_subtitle;

    public function set_subtitle(
        string $value
    ): void
    {
        $this->_subtitle = $value;
    }

    public function get_subtitle(): string
    {
        return $this->_subtitle;
    }
}

Of course, I got Fatal error: Undefined method get_subtitle because this method not defined in PHP-GTK3

But suppose it is possible to make extendable PHP classes support, or not?

[scorninpc]

This is not a PHP-GTK problem

If you provide a full working code, i can help with your logic

[scorninpc]

This is the case?

<?php
	/**
	 * custom label
	 */
	class CustomLabel extends \GtkLabel
	{
		private string $_subtitle;

		public function set_subtitle(string $value): void
		{
			$this->_subtitle = $value;
		}

		public function get_subtitle(): string
		{
			return $this->_subtitle;
		}
	}

	Gtk::init();

	$window = new GtkWindow();
	$window->set_size_request(500, 500);
	$window->set_title("PHP-GTK");

	// create the notebook
	$notebook = new GtkNotebook();
	$window->add($notebook);
	$notebook->set_scrollable(true);

	// store all labels
	$labels = [];

	// add page 1
	$labels[] = new CustomLabel("Page 1");
	$notebook->append_page(GtkButton::new_with_label("Container 1"), end($labels));
 
	// add page 2
	$labels[] = new CustomLabel("Page 2");
	$notebook->append_page(GtkButton::new_with_label("Container 2"), end($labels));

	// on switch page
	$notebook->connect("switch-page", function($widget, $page, $index) use ($labels) {

		// retriave custom label by tab index
		$label = $labels[$index];

		// use it
		var_dump($label->set_subtitle("OK"));
		var_dump($label);
	});

	
	// connect to signal that close program
	$window->connect("destroy", function() {
		Gtk::main_quit();
	});

	// show all and start
	$window->show_all();
	Gtk::main();

As PHP-GTK as a language bind, I need to do alot cast internally, so this destroy PHP classes and pass GTK class. You'll not able to create a PHP class in GTK heap. I cannot directly cast PHP class to a GPointer, you get it?

[d47081]

Thanks, seems that global array could help.

Just interested in solution where PHP-GTK able to return back the extended object constructed by PHP.
Anyway, even if it's possible by PHP-CPP, it may cause assertion issues, so yes, closed maybe.

[d47081]

As PHP-GTK as a language bind, I need to do alot cast internally, so this destroy PHP classes and pass GTK class. You'll not able to create a PHP class in GTK heap. I cannot directly cast PHP class to a GPointer, you get it?

I don't understand exactly how does it work, but meant something like magic methods:

Php::Value GtkWidget_::__get(const Php::Value &name)
{
	return Php::Base::__get(name);
}

[scorninpc]

This is more of a GTK issue, not PHP-CPP. I can't cast a PHP object to gpointer and store the original PHP class. So when I use a GTK method that returns a gpointer, I can't correlate it with the original PHP class

Maybe if I rewrite all extension to store a PHP object, and not a GTK instance https://github.com/scorninpc/php-gtk3/blob/master/src/G/GObject.h#L27 (or both) .... So maybe in PHP-GTK4 I can try something, but i dont thing it's will work with alot internal hard coded references