AbstractComponentRenderer.php

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<?php

/* Copyright (c) 2016 Richard Klees <richard.klees@concepts-and-training.de> Extended GPL, see docs/LICENSE */

namespace ILIAS\UI\Implementation\Render;

use ILIAS\UI\Component\Component;
use ILIAS\UI\Component\JavaScriptBindable;
use ILIAS\UI\Component\Triggerer;
use ILIAS\UI\Factory;

abstract class AbstractComponentRenderer implements ComponentRenderer
{
    private $ui_factory;

    private $tpl_factory;

    private $lng;

    private $js_binding;

    final public function __construct(Factory $ui_factory, TemplateFactory $tpl_factory, \ilLanguage $lng, JavaScriptBinding $js_binding)
    {
        $this->ui_factory = $ui_factory;
        $this->tpl_factory = $tpl_factory;
        $this->lng = $lng;
        $this->js_binding = $js_binding;
    }

    public function registerResources(ResourceRegistry $registry)
    {
    }

    final protected function getUIFactory()
    {
        return $this->ui_factory;
    }

    final public function txt($id)
    {
        return $this->lng->txt($id);
    }

    final public function toJS($key)
    {
        $this->lng->toJS($key);
    }

    public function getLangKey()
    {
        return $this->lng->getLangKey();
    }


    final protected function getJavascriptBinding()
    {
        return $this->js_binding;
    }

    final protected function getTemplate($name, $purge_unfilled_vars, $purge_unused_blocks)
    {
        $path = $this->getTemplatePath($name);
        return $this->tpl_factory->getTemplate($path, $purge_unfilled_vars, $purge_unused_blocks);
    }

    protected function getTemplatePath($name)
    {
        $component = $this->getMyComponent();
        return "src/UI/templates/default/$component/$name";
    }

    final protected function bindJavaScript(JavaScriptBindable $component)
    {
        if ($component instanceof Triggerer) {
            $component = $this->addTriggererOnLoadCode($component);
        }
        return $this->bindOnloadCode($component);
    }

    private function bindOnloadCode(JavaScriptBindable $component)
    {
        $binder = $component->getOnLoadCode();
        if ($binder === null) {
            return null;
        }
        $id = $this->js_binding->createId();
        $on_load_code = $binder($id);
        if (!is_string($on_load_code)) {
            throw new \LogicException(
                "Expected JavaScript binder to return string" .
                " (used component: " . get_class($component) . ")"
            );
        }
        $this->js_binding->addOnLoadCode($on_load_code);
        return $id;
    }

    private function addTriggererOnLoadCode(Triggerer $triggerer)
    {
        $triggered_signals = $triggerer->getTriggeredSignals();
        if (count($triggered_signals) == 0) {
            return $triggerer;
        }
        return $triggerer->withAdditionalOnLoadCode(function ($id) use ($triggered_signals) {
            $code = "";
            foreach ($triggered_signals as $triggered_signal) {
                $signal = $triggered_signal->getSignal();
                $event = $triggered_signal->getEvent();
                $options = json_encode($signal->getOptions());
                $code .=
                    "$('#{$id}').on('{$event}', function(event) {
                                                $(this).trigger('{$signal}',
                                                        {
                                                                'id' : '{$signal}', 'event' : '{$event}',
                                                                'triggerer' : $(this),
                                                                'options' : JSON.parse('{$options}')
                                                        }
                                                );
                                                return false;
                                        });";
            }
            return $code;
        });
    }

    final protected function checkComponent(Component $component)
    {
        $interfaces = $this->getComponentInterfaceName();
        if (!is_array($interfaces)) {
            throw new \LogicException(
                "Expected array, found '" . (string) (null) . "' when rendering."
            );
        }

        foreach ($interfaces as $interface) {
            if ($component instanceof $interface) {
                return;
            }
        }
        $ifs = implode(", ", $interfaces);
        throw new \LogicException(
            "Expected $ifs, found '" . get_class($component) . "' when rendering."
        );
    }

    abstract protected function getComponentInterfaceName();

    // TODO: We might want to cache this.
    private function getMyComponent()
    {
        $class = get_class($this);
        $matches = array();
        // Extract component
        $re = "%ILIAS\\\\UI\\\\Implementation\\\\Component\\\\(\\w+)\\\\(\\w+)%";
        if (preg_match($re, $class, $matches) !== 1) {
            throw new \LogicException(
                "The Renderer needs to be located in ILIAS\\UI\\Implementation\\Component\\*."
            );
        }
        return $matches[1];
    }
}