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  <section id="implementing-behaviors-with-the-phaser-events">
<h1>Implementing behaviors with the Phaser events<a class="headerlink" href="#implementing-behaviors-with-the-phaser-events" title="Link to this heading"></a></h1>
<p>Many <a class="reference external" href="../scene-editor/user-components.html">user components</a> you will create will implement certain behavior of an object. This behavior should be initialized and later updated at every step of the game loop.</p>
<p>Game engines like <a class="reference external" href="https://unity.com">Unity</a>, that support a similar design pattern, <a class="reference external" href="https://docs.unity3d.com/Manual/CreatingAndUsingScripts.html">use a Start and Update methods</a> to implement the behavior of the component.</p>
<p>The <a class="reference external" href="https://phaser.io">Phaser</a> framework does not provide a similar approach, components are not part of the <a class="reference external" href="https://phaser.io">Phaser</a> API. However, <a class="reference external" href="https://phaser.io">Phaser</a> provides a lot of events that you can handle and implement the gameplay. For example, you can simulate the Unity scripting using the <a class="reference external" href="../scene-editor/user-components.html">user components</a> and the <a class="reference external" href="https://phaser.io">Phaser</a> events. You can create an <strong>EventComponent</strong> class that handles the events:</p>
<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="kd">class</span><span class="w"> </span><span class="nx">EventComponent</span><span class="w"> </span><span class="p">{</span>

<span class="w">    </span><span class="cm">/**</span>
<span class="cm">    * @param {Phaser.GameObjects.GameObject} gameObject</span>
<span class="cm">    */</span>
<span class="w">    </span><span class="kr">constructor</span><span class="p">(</span><span class="nx">gameObject</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>

<span class="w">        </span><span class="k">this</span><span class="p">.</span><span class="nx">scene</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nx">gameObject</span><span class="p">.</span><span class="nx">scene</span><span class="p">;</span>

<span class="w">        </span><span class="c1">// first time the scene is updated, call the `start` method</span>
<span class="w">        </span><span class="k">this</span><span class="p">.</span><span class="nx">scene</span><span class="p">.</span><span class="nx">events</span><span class="p">.</span><span class="nx">once</span><span class="p">(</span><span class="nx">Phaser</span><span class="p">.</span><span class="nx">Scenes</span><span class="p">.</span><span class="nx">Events</span><span class="p">.</span><span class="nx">UPDATE</span><span class="p">,</span><span class="w"> </span><span class="k">this</span><span class="p">.</span><span class="nx">start</span><span class="p">,</span><span class="w"> </span><span class="k">this</span><span class="p">);</span>
<span class="w">        </span><span class="c1">// each time the scene is updated, call the `update` method</span>
<span class="w">        </span><span class="k">this</span><span class="p">.</span><span class="nx">scene</span><span class="p">.</span><span class="nx">events</span><span class="p">.</span><span class="nx">on</span><span class="p">(</span><span class="nx">Phaser</span><span class="p">.</span><span class="nx">Scenes</span><span class="p">.</span><span class="nx">Events</span><span class="p">.</span><span class="nx">UPDATE</span><span class="p">,</span><span class="w"> </span><span class="k">this</span><span class="p">.</span><span class="nx">update</span><span class="p">,</span><span class="w"> </span><span class="k">this</span><span class="p">);</span>
<span class="w">        </span><span class="c1">// if the object is destroyed, call the `destroy` method</span>
<span class="w">        </span><span class="nx">gameObject</span><span class="p">.</span><span class="nx">on</span><span class="p">(</span><span class="nx">Phaser</span><span class="p">.</span><span class="nx">GameObjects</span><span class="p">.</span><span class="nx">Events</span><span class="p">.</span><span class="nx">DESTROY</span><span class="p">,</span><span class="w"> </span><span class="k">this</span><span class="p">.</span><span class="nx">destroy</span><span class="p">,</span><span class="w"> </span><span class="k">this</span><span class="p">);</span>
<span class="w">    </span><span class="p">}</span>

<span class="w">    </span><span class="nx">start</span><span class="p">()</span><span class="w"> </span><span class="p">{</span>
<span class="w">        </span><span class="c1">// to be overridden in derived classes</span>
<span class="w">    </span><span class="p">}</span>

<span class="w">    </span><span class="nx">update</span><span class="p">()</span><span class="w"> </span><span class="p">{</span>
<span class="w">        </span><span class="c1">// to be overridden in derived classes</span>
<span class="w">    </span><span class="p">}</span>

<span class="w">    </span><span class="nx">destroy</span><span class="p">()</span><span class="w"> </span><span class="p">{</span>
<span class="w">        </span><span class="c1">// the object is destroyed, so we remove all the event handlers</span>
<span class="w">        </span><span class="k">this</span><span class="p">.</span><span class="nx">scene</span><span class="p">.</span><span class="nx">events</span><span class="p">.</span><span class="nx">off</span><span class="p">(</span><span class="nx">Phaser</span><span class="p">.</span><span class="nx">Scenes</span><span class="p">.</span><span class="nx">Events</span><span class="p">.</span><span class="nx">UPDATE</span><span class="p">,</span><span class="w"> </span><span class="k">this</span><span class="p">.</span><span class="nx">start</span><span class="p">,</span><span class="w"> </span><span class="k">this</span><span class="p">);</span>
<span class="w">        </span><span class="k">this</span><span class="p">.</span><span class="nx">scene</span><span class="p">.</span><span class="nx">events</span><span class="p">.</span><span class="nx">off</span><span class="p">(</span><span class="nx">Phaser</span><span class="p">.</span><span class="nx">Scenes</span><span class="p">.</span><span class="nx">Events</span><span class="p">.</span><span class="nx">UPDATE</span><span class="p">,</span><span class="w"> </span><span class="k">this</span><span class="p">.</span><span class="nx">update</span><span class="p">,</span><span class="w"> </span><span class="k">this</span><span class="p">);</span>
<span class="w">    </span><span class="p">}</span>
<span class="p">}</span>
</pre></div>
</div>
<p>Then, you can set the <strong>EventComponent</strong> class as super class to all your components:</p>
<img alt="Setting a super class to components." src="../_images/scene-editor-user-components-super-class-07302020.webp" />
<p>Now, you can override the <strong>start</strong>, <strong>update</strong>, and <strong>destroy</strong> methods in the component classes.</p>
<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="kd">class</span><span class="w"> </span><span class="nx">HorizontalMove</span><span class="w"> </span><span class="k">extends</span><span class="w"> </span><span class="nx">EventComponent</span><span class="w"> </span><span class="p">{</span>

<span class="w">    </span><span class="p">...</span>

<span class="w">    </span><span class="nx">update</span><span class="p">()</span><span class="w"> </span><span class="p">{</span>

<span class="w">        </span><span class="k">this</span><span class="p">.</span><span class="nx">gameObject</span><span class="p">.</span><span class="nx">x</span><span class="w"> </span><span class="o">+=</span><span class="w"> </span><span class="k">this</span><span class="p">.</span><span class="nx">deltaX</span><span class="p">;</span>
<span class="w">    </span><span class="p">}</span>
<span class="p">}</span>
</pre></div>
</div>
<p>The <code class="docutils literal notranslate"><span class="pre">EventComponent</span></code> class is just an example of what you can do. It has a weak point: not all components need to listen to all the events. It is a waste of resources adding scene listeners in all the cases.</p>
<p>Since v3.13.0, the editor can “write” for you a base class that could be a better solution. However,  you can change its code and adapt it to your specific domain. Check the next section for more details.</p>
</section>


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