VisibilityAvailabilityTrait.php

Go to the documentation of this file.

<?php
 
declare(strict_types=1);
 
namespace ILIAS\GlobalScreen\Scope;
 
use Closure;
 
trait VisibilityAvailabilityTrait
{
    protected ?Closure $available_callable = null;
    protected ?Closure $visiblility_callable = null;
 
    private ?bool $is_visible_static = null;
 
    public function withVisibilityCallable(callable $is_visible): self
    {
        $clone = clone($this);
        $clone->visiblility_callable = $is_visible;
        $clone->is_visible_static = null;
 
        return $clone;
    }
 
    public function isVisible(): bool
    {
        if (isset($this->is_visible_static)) {
            return $this->is_visible_static;
        }
        if (!$this->isAvailable()) {
            return $this->is_visible_static = false;
        }
        if (is_callable($this->visiblility_callable)) {
            $callable = $this->visiblility_callable;
 
            $value = (bool) $callable();
 
            return $this->is_visible_static = $value;
        }
 
        return $this->is_visible_static = true;
    }
 
    public function withAvailableCallable(callable $is_available): self
    {
        $clone = clone($this);
        $clone->available_callable = $is_available;
 
        return $clone;
    }
 
    public function isAvailable(): bool
    {
        if ($this->isAlwaysAvailable() === true) {
            return true;
        }
        if (is_callable($this->available_callable)) {
            $callable = $this->available_callable;
 
            return (bool) $callable();
        }
 
        return true;
    }
 
    public function isAlwaysAvailable(): bool
    {
        return false;
    }
}