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User input/Graphical: Difference between revisions
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{{libheader|Flutter}}
Displays
<lang javascript>import 'package:flutter/material.dart';
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String output = "output"; // This will be displayed in an output text field
TextEditingController
TextEditingController _numberInputController = TextEditingController();
@override
Widget build( BuildContext context ) {
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SizedBox( height: 25 ), // Space between top and text field
TextField ( //
controller:
textAlign: TextAlign.center, // Center text
decoration: InputDecoration( border: OutlineInputBorder(), labelText: 'Enter a string...'), // Border and default text
),
SizedBox( height: 10 ), // Space between text fields
TextField ( // Number input Text Field
controller: _numberInputController, // Add input controller so we can grab text
textAlign: TextAlign.center, // Center text
decoration: InputDecoration( border: OutlineInputBorder(), labelText: 'Enter 75000'), // Border and default text
),
FlatButton ( // Submit Button
color: Colors.blue[400] // button color▼
onPressed: () { // On pressed Callback for button
setState( () {
output = '
int number; // Int to store number in
var stringInput = _stringInputController.text ?? ''; // Get the input from the first field, if it is null set it to an empty string
var numberString = _numberInputController.text ?? ''; // Get the input from the second field, if it is null set it to an empty string
if ( stringInput == '') { // If first field is empty
output = 'Please enter something in field 1\n';
return;
}
if (_numberInputController.text == '') { // If second field is empty
output += 'Please enter something in field 2';
return;
} else { // If we got an input in the second field
try {
number = int.parse( numberString ); // Parse numberString into an int
if ( number == 75000 )
output = 'text output: $stringInput\nnumber: $number'; // Grabs the text from the input controllers and changes the string
else
output = '$number is not 75000!';
} on FormatException { // If a number is not entered in second field
output = '$numberString is not a number!';
}
}
});
}
▲ child: Text('Submit Text'), // Button Text
▲ color: Colors.blue[400] // button color
),
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