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<title>build method - SendScreenState class - send_screen library - Dart API</title>
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<li><a href="../../pages_send_screen/SendScreenState-class.html">SendScreenState</a></li>
<li class="self-crumb">build method</li>
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<h1><span class="kind-method">build</span> method
</h1></div>
<section class="multi-line-signature">
<div>
<ol class="annotation-list">
<li>@<a href="https://api.flutter.dev/flutter/dart-core/override-constant.html">override</a></li>
</ol>
</div>
<span class="returntype"><a href="https://api.flutter.dev/flutter/widgets/Widget-class.html">Widget</a></span>
<span class="name ">build</span>(<wbr><ol class="parameter-list"><li><span class="parameter" id="build-param-context"><span class="type-annotation"><a href="https://api.flutter.dev/flutter/widgets/BuildContext-class.html">BuildContext</a></span> <span class="parameter-name">context</span></span></li>
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<div class="features"><span class="feature">override</span></div>
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<section class="desc markdown">
<p>Builds the UI for the send screen.</p>
<p>Returns a <a href="https://api.flutter.dev/flutter/material/Scaffold-class.html">Scaffold</a> widget that contains a <a href="https://api.flutter.dev/flutter/widgets/Column-class.html">Column</a> with two children:</p>
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<li>A <a href="https://api.flutter.dev/flutter/widgets/Center-class.html">Center</a> widget that contains a <a href="https://api.flutter.dev/flutter/widgets/Stack-class.html">Stack</a> with a <a href="https://api.flutter.dev/flutter/widgets/GestureDetector-class.html">GestureDetector</a> that
handles file picking and dragging.</li>
<li>An <a href="https://api.flutter.dev/flutter/material/ElevatedButton-class.html">ElevatedButton</a> that triggers the transfer when pressed.</li>
</ul>
</section>
<section class="summary source-code" id="source">
<h2><span>Implementation</span></h2>
<pre class="language-dart"><code class="language-dart">@override
Widget build(BuildContext context) {
return Scaffold(
&#47;&#47; Set the background color of the scaffold.
backgroundColor: Constants.backColor,
&#47;&#47; Build the body of the scaffold.
body: Column(
&#47;&#47; Align the children vertically to the center.
mainAxisAlignment: MainAxisAlignment.center,
children: [
&#47;&#47; Build the file picking and dragging UI.
Center(
child: Stack(
children: [
&#47;&#47; Build the gesture detector.
GestureDetector(
&#47;&#47; Handle file picking when the user taps.
onTap: openFilePicker,
&#47;&#47; Handle file dragging.
child: DropTarget(
&#47;&#47; Add the selected files to the list when the user drops files.
onDragDone: (detail) {
setState(() {
_list.addAll(detail.files);
});
},
&#47;&#47; Show the add icon when the user drags files over the drop area.
onDragEntered: (detail) {
setState(() {
_dragging = true;
});
},
&#47;&#47; Hide the add icon when the user stops dragging files.
onDragExited: (detail) {
setState(() {
_dragging = false;
});
},
&#47;&#47; Build the drop area UI.
child: Column(
children: [
&#47;&#47; Build the circular container for the drop area.
Container(
height: 200,
width: 200,
decoration: const BoxDecoration(
shape: BoxShape.circle,
color: Constants.textColor),
&#47;&#47; Show the add icon when the user is dragging files.
child: _dragging
? const Center(
child: Icon(
Icons.add_rounded,
color: Constants.highlightColor,
size: 200,
),
)
&#47;&#47; Show the upload icon when the user is not dragging files.
: const Center(
child: Icon(
Icons.upload_rounded,
color: Constants.highlightColor,
size: 200,
),
),
),
&#47;&#47; Add some spacing between the drop area and the send button.
const SizedBox(height: 16),
],
),
),
),
],
),
),
&#47;&#47; Build the send button.
ElevatedButton(
style: ElevatedButton.styleFrom(
&#47;&#47; Set the background color of the button.
backgroundColor: Constants.textColor,
&#47;&#47; Set the text color of the button.
foregroundColor: Constants.backColor,
&#47;&#47; Set the shape of the button.
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(20),
),
),
&#47;&#47; Trigger the transfer when the user presses the button.
onPressed: () {
_startTransfer();
},
&#47;&#47; Set the text of the button.
child: const Text(&quot;Send&quot;),
),
],
),
);
}</code></pre>
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<h5>SendScreenState class</h5>
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