added src files

composer.json

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+{
+  "name": "infinityloop-dev/observer-component",
+  "description": "Event system for Nette framework's component model.",
+  "homepage": "https://www.infinityloop.dev/",
+  "type": "library",
+  "license": ["MIT"],
+  "authors": [
+    {
+      "name": "Václav Pelíšek",
+      "homepage": "https://www.peldax.com"
+    }
+  ],
+  "require": {
+    "php": ">=7.4",
+    "nette/application": "^3.0",
+    "nette/caching": "^3.0",
+    "nette/utils": "^3.0"
+  },
+  "autoload": {
+    "psr-4": {
+      "Infinityloop\\": "src/"
+    }
+  }
+}

src/ObserverComponent/EventMapper.php

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+<?php
+
+declare(strict_types = 1);
+
+namespace Infinityloop\ObserverComponent;
+
+final class EventMapper
+{
+    use Nette\SmartObject;
+
+    private \Nette\Application\Application $application;
+    private \Nette\Caching\IStorage $storage;
+    private ?\Nette\Caching\Cache $eventMap = null;
+    private bool $debugMode;
+
+    public function __construct(
+        \Nette\Application\Application $application,
+        \Nette\Caching\IStorage $storage,
+        bool $debugMode = true
+    )
+    {
+        $this->application = $application;
+        $this->storage = $storage;
+        $this->debugMode = $debugMode;
+    }
+
+    public function registerObserver(IObserverComponent $component) : void
+    {
+        $componentPath = $component->lookupPath(\Nette\Application\IPresenter::class);
+        \assert(\is_string($componentPath));
+
+        if (!$this->debugMode && $this->isComponentRegistered($componentPath)) {
+            return;
+        }
+
+        foreach ($component::getObservedEvents() as $eventName) {
+            \assert(\is_string($eventName) && \class_exists($eventName));
+
+            $observerList = $this->getObserverList($eventName);
+
+            if (\in_array($componentPath, $observerList, true)) {
+                continue;
+            }
+
+            $observerList[] = $componentPath;
+            $this->getEventMap()->save($eventName, $observerList);
+
+            $registeredComponents = $this->getEventMap()->load('components') ?? [];
+            $registeredComponents[] = $componentPath;
+            $this->getEventMap()->save('components', $registeredComponents);
+        }
+    }
+
+    public function dispatchEvent(IEvent $event) : void
+    {
+        $presenter = $this->application->getPresenter();
+        \assert($presenter instanceof \Nette\Application\UI\Control);
+
+        foreach ($this->getObserverList(\get_class($event)) as $observerPath) {
+            \assert(\is_string($observerPath));
+
+            $observer = $presenter->getComponent($observerPath);
+            \assert($observer instanceof IObserverComponent);
+
+            $observer->observableUpdated($event);
+        }
+    }
+
+    private function getObserverList(string $eventName) : array
+    {
+        return $this->getEventMap()->load($eventName)
+            ?? [];
+    }
+
+    private function isComponentRegistered(string $componentPath) : bool
+    {
+        $registeredComponents = $this->getEventMap()->load('components') ?? [];
+
+        return \in_array($componentPath, $registeredComponents, true);
+    }
+
+    private function getEventMap() : \Nette\Caching\Cache
+    {
+        if (!$this->eventMap instanceof \Nette\Caching\Cache) {
+            $applicationPath = \ltrim($this->application->getPresenter()->getAction(true), ':');
+            $this->eventMap = new \Nette\Caching\Cache($this->storage, 'eventMapper-' . $applicationPath);
+        }
+
+        return $this->eventMap;
+    }
+}

src/ObserverComponent/IEvent.php

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+<?php
+
+declare(strict_types = 1);
+
+namespace Infinityloop\ObserverComponent;
+
+interface IEvent
+{
+}

src/ObserverComponent/IObservable.php

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+<?php
+
+declare(strict_types = 1);
+
+namespace Infinityloop\ObserverComponent;
+
+interface IObservable
+{
+    public function injectEventMapperObservable(EventMapper $eventMapper) : void;
+
+    public function notifyObservers(IEvent $event) : void;
+}

src/ObserverComponent/IObserverComponent.php

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+<?php
+
+declare(strict_types = 1);
+
+namespace Infinityloop\ObserverComponent;
+
+interface IObserverComponent
+{
+    public static function getObservedEvents() : array;
+
+    public function injectEventMapperObserver(EventMapper $eventMapper) : void;
+
+    public function observableUpdated(IEvent $event) : void;
+
+    public function lookupPath(?string $type = null, bool $throw = true) : ?string;
+}

src/ObserverComponent/TObservable.php

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+<?php
+
+declare(strict_types = 1);
+
+namespace Infinityloop\ObserverComponent;
+
+trait TObservable
+{
+    private EventMapper $eventMapper;
+
+    final public function injectEventMapperObservable(EventMapper $eventMapper) : void
+    {
+        $this->eventMapper = $eventMapper;
+    }
+
+    public function notifyObservers(IEvent $event) : void
+    {
+        $this->eventMapper->dispatchEvent($event);
+    }
+}

src/ObserverComponent/TObserverComponent.php

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+<?php
+
+declare(strict_types = 1);
+
+namespace Infinityloop\ObserverComponent;
+
+trait TObserverComponent
+{
+    private EventMapper $eventMapper;
+
+    abstract public static function getObservedEvents() : array;
+
+    abstract public function observableUpdated(IEvent $event) : void;
+
+    final public function injectEventMapperObserver(EventMapper $eventMapper) : void
+    {
+        $this->eventMapper = $eventMapper;
+        $this->onAnchor[] = function (\Nette\ComponentModel\IComponent $parent) : void {
+            $this->eventMapper->registerObserver($this);
+        };
+    }
+}