90 lines
3.7 KiB
Dart
90 lines
3.7 KiB
Dart
import 'package:flutter/material.dart';
|
|
|
|
main() => runApp( OutputLabel() );
|
|
|
|
class OutputLabel extends StatefulWidget {
|
|
@override
|
|
_OutputLabelState createState() => _OutputLabelState();
|
|
}
|
|
|
|
class _OutputLabelState extends State<OutputLabel> {
|
|
String output = "output"; // This will be displayed in an output text field
|
|
|
|
TextEditingController _stringInputController = TextEditingController(); // Allows us to get the text from a text field
|
|
TextEditingController _numberInputController = TextEditingController();
|
|
|
|
@override
|
|
Widget build( BuildContext context ) {
|
|
return MaterialApp(
|
|
debugShowCheckedModeBanner: false, // Disable debug banner in top right
|
|
home: Scaffold ( // Scaffold provides a layout for the app
|
|
body: Center ( // Everything in the center widget will be centered
|
|
child: Column ( // All the widgets will be in a column
|
|
children: <Widget> [
|
|
SizedBox( height: 25 ), // Space between top and text field
|
|
|
|
TextField ( // String input Text Field
|
|
controller: _stringInputController, // Add input controller so we can grab text
|
|
textAlign: TextAlign.center, // Center text
|
|
decoration: InputDecoration( border: OutlineInputBorder(), labelText: 'Enter a string...'), // Border and default text
|
|
), // end TextField
|
|
|
|
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
|
|
), // end TextField
|
|
|
|
FlatButton ( // Submit Button
|
|
child: Text('Submit Data'), // Button Text
|
|
color: Colors.blue[400] // button color
|
|
onPressed: () { // On pressed Callback for button
|
|
setState( () {
|
|
output = ''; // Reset 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!';
|
|
}
|
|
|
|
}
|
|
|
|
});
|
|
}
|
|
), // End FlatButton
|
|
|
|
Text( output ) // displays output
|
|
|
|
]
|
|
)
|
|
)
|
|
)
|
|
);
|
|
}
|
|
}
|