Create notifiable property

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Hello,

How would you like to create a notifiable property for GObject ?

Use :

function my_callback(MyObject $object, GParamSpec $param, mixed $user_data) {
    echo $param->name . " changed", PHP_EOL;
}
$object = new MyObject();
$object->connect("signal::notify::zoom", "my_callback", "my_data", NULL);

$object->zoom = 100; // this emit signal "notify::zoom" who call the callback of each connection.

Output :
zoom changed

---

Example 1 :

Add class property after declaration and before his instantiation.

<?php
class MyObject extends GObject {
	$zoom;
}
$spec = GParamSpecUint("zoom", "Zoom prop", "Set zoom", 0, 100, 51, GParam::CONSTRUCT_ONLY);
GObjectClass::InstallProperty(MyObject::class, 1, $spec);
//unset($spec)

A possible alternative( That I don't like) :

<?php
class MyObject extends GObject {
	$zoom;
        public function __construct() {
                parent::__contrust();
                static $installed_class = 0;
                if (!$installed_class) {
                        $spec = GParamSpecUint("zoom", "Zoom prop", "Set zoom", 0, 100, 51, GParam::CONSTRUCT_ONLY);
                        GObjectClass::InstallProperty(MyObject::class, 1, $spec);
                        $installed_class = 1;
                }
        }
}

---

Example 2 :

Add class property using annotations.

<?php
class MyObject extends GObject {
	/**
	 * @g_param_spec_uint(
	 *     name: "zoom",
	 *     nick: "Zoom prop",
	 *     "Set zoom",
	 *     0, 100, 51,
	 *     G_PARAM_CONSTRUCT | G_PARAM_READWRITE)
	 */
	$zoom;
}

A possible alternative :

<?php
class MyObject extends GObject {
	/** Set zoom
	 * @property(readwrite) uint $zoom Zoom property
	 * @range(0, 100)
	 */
	int $zoom = 51;
}

And even like that

<?php
class MyObject extends GObject {
	#[GPropertyUint("zoom", "Zoom prop", "Set zoom", 0, 100, 51, GParam::CONSTRUCT | GParam::READWRITE)]
	int $zoom;
}

---

Example 3 :

All members of GObject child classes are notifiable automatically properties.

<?php
class MyObject extends GObject {
	public int $zoom = 51;// Type declaration required
}

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What do you think of this topic?