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<h1 id="behaviour-builder">Behaviour Builder<a class="headerlink" href="#behaviour-builder" title="Permanent link">&para;</a></h1>
<p>In the previous pages about <a href="https://bookstack.inmo.dev/books/telegrambotapi/page/updates-with-flows">updates handling</a> and was mentioned that currently in the most cases you should use <a href="https://kotlinlang.org/docs/flow.html">Flow</a>s. So, there is an improvement for that system which hide direct work with flows and allow you to create more declarative logic of your bot.</p>
<h2 id="main-parts-of-behaviour-builder">Main parts of Behaviour Builder<a class="headerlink" href="#main-parts-of-behaviour-builder" title="Permanent link">&para;</a></h2>
<p>There are several things you should know for better understanding of behaviour builder:</p>
<ul>
<li><a href="https://github.com/InsanusMokrassar/TelegramBotAPI/blob/master/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/BehaviourContext.kt#L33">BehaviourContext</a> - it is the thing which contains all necessary tools for working with bots</li>
<li><a href="https://tgbotapi.inmo.dev/docs/dev.inmo.tgbotapi.extensions.behaviour_builder.triggers_handling/index.html">Triggers</a> - <code>on*</code> extensions for <code>BehaviourContext</code> which allow you to create reaction on some update</li>
<li><a href="https://tgbotapi.inmo.dev/docs/dev.inmo.tgbotapi.extensions.behaviour_builder.expectations/index.html">Expectations</a> (or waiters) - <code>wait*</code> extensions which you <strong>may</strong> use in <a href="https://tgbotapi.inmo.dev/docs/dev.inmo.tgbotapi.extensions.behaviour_builder/build-behaviour.html">buildBehaviour</a> function, but <strong><em>it is recommended</em></strong> to use it in bodies of triggers</li>
</ul>
<h2 id="initialization">Initialization<a class="headerlink" href="#initialization" title="Permanent link">&para;</a></h2>
<p>As was said above, there is <a href="https://tgbotapi.inmo.dev/docs/dev.inmo.tgbotapi.extensions.behaviour_builder/build-behaviour.html">buildBehaviour</a> function which allow you set up your bot logic. Let&rsquo;s see an example:</p>
<pre><code class="language-kotlin">val bot = telegramBot(&quot;TOKEN&quot;)
bot.buildBehaviour {
onCommand(&quot;start&quot;) { // creating of trigger
val message = it
val content = message.content
reply(message, &quot;Ok, send me one photo&quot;) // send text message with replying on incoming message
val photoContent = waitPhoto().first() // waitPhoto will return List, so, get first element
val photo = downloadFile(photoContent) // ByteArray of photo
// some logic with saving of photos
}
}
</code></pre>
<h2 id="filters">Filters<a class="headerlink" href="#filters" title="Permanent link">&para;</a></h2>
<p>In most cases there are opportunity to filter some of messages before starting of main logic. Let&rsquo;s look at this using the example above:</p>
<pre><code class="language-kotlin">val bot = telegramBot(&quot;TOKEN&quot;)
bot.buildBehaviour {
onCommand(
&quot;start&quot;,
initialFilter = {
it.content.textSources.size == 1 // make sure that user has sent /start without any additions
}
) {
// ...
}
}
</code></pre>
<p>OR</p>
<pre><code class="language-kotlin">val bot = telegramBot(&quot;TOKEN&quot;)
bot.buildBehaviour {
onCommand(
&quot;start&quot;,
requireOnlyCommandInMessage = true // it is default, but you can overwrite it with `requireOnlyCommandInMessage = false`
) {
// ...
}
}
</code></pre>
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