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Website Deployment Script
2017-12-07 23:32:59 +00:00
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docs/backhandler.html
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@@ -5,24 +5,20 @@
nav.classList.toggle('docsSliderActive');
};
</script></nav></div><div class="container mainContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/facebook/react-native-website/blob/master/docs/backhandler.md" target="_blank">Edit</a><h1>BackHandler</h1></header><article><div><span><p>Detect hardware button presses for back navigation.</p>
<p>Android: Detect hardware back button presses, and programmatically invoke the default back button
functionality to exit the app if there are no listeners or if none of the listeners return true.</p>
<p>tvOS: Detect presses of the menu button on the TV remote. (Still to be implemented:
programmatically disable menu button handling
functionality to exit the app if there are no listeners or if none of the listeners return true.)</p>
<p>Android: Detect hardware back button presses, and programmatically invoke the default back button functionality to exit the app if there are no listeners or if none of the listeners return true.</p>
<p>tvOS: Detect presses of the menu button on the TV remote. (Still to be implemented: programmatically disable menu button handling functionality to exit the app if there are no listeners or if none of the listeners return true.)</p>
<p>iOS: Not applicable.</p>
<p>The event subscriptions are called in reverse order (i.e. last registered subscription first),
and if one subscription returns true then subscriptions registered earlier will not be called.</p>
<p>The event subscriptions are called in reverse order (i.e. last registered subscription first), and if one subscription returns true then subscriptions registered earlier will not be called.</p>
<p>Example:</p>
<pre><code class="hljs css javascript">BackHandler.addEventListener(<span class="hljs-string">'hardwareBackPress'</span>, <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params"></span>) </span>{
<span class="hljs-comment">// this.onMainScreen and this.goBack are just examples, you need to use your own implementation here</span>
<span class="hljs-comment">// Typically you would use the navigator here to go to the last state.</span>
<span class="hljs-comment">// this.onMainScreen and this.goBack are just examples, you need to use your own implementation here</span>
<span class="hljs-comment">// Typically you would use the navigator here to go to the last state.</span>
<span class="hljs-keyword">if</span> (!<span class="hljs-keyword">this</span>.onMainScreen()) {
<span class="hljs-keyword">this</span>.goBack();
<span class="hljs-keyword">return</span> <span class="hljs-literal">true</span>;
}
<span class="hljs-keyword">return</span> <span class="hljs-literal">false</span>;
<span class="hljs-keyword">if</span> (!<span class="hljs-keyword">this</span>.onMainScreen()) {
<span class="hljs-keyword">this</span>.goBack();
<span class="hljs-keyword">return</span> <span class="hljs-literal">true</span>;
}
<span class="hljs-keyword">return</span> <span class="hljs-literal">false</span>;
});
</code></pre>
<h3><a class="anchor" aria-hidden="true" name="methods"></a><a href="#methods" aria-hidden="true" class="hash-link" ><svg aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Methods</h3>