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Reorganize the calculator demo (#4536)

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This patch is a warmup to improving the visuals in the calculator demo.

Related to #4535
This commit is contained in:
Adam Barth 2016-06-13 11:44:46 -07:00 committed by GitHub
parent d2e3493a6c
commit 1d5d7f4ad3
7 changed files with 277 additions and 282 deletions
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269
examples/flutter_gallery/lib/demo/calculator/home.dart Normal file
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@ -0,0 +1,269 @@
// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'package:flutter/material.dart';
import 'logic.dart';
class Calculator extends StatefulWidget {
Calculator({Key key}) : super(key: key);
@override
_CalculatorState createState() => new _CalculatorState();
}
class _CalculatorState extends State<Calculator> {
/// As the user taps keys we update the current `_expression` and we also
/// keep a stack of previous expressions so we can return to earlier states
/// when the user hits the DEL key.
final List<CalcExpression> _expressionStack = <CalcExpression>[];
CalcExpression _expression = new CalcExpression.Empty();
// Make `expression` the current expression and push the previous current
// expression onto the stack.
void pushExpression(CalcExpression expression) {
_expressionStack.add(_expression);
_expression = expression;
}
/// Pop the top expression off of the stack and make it the current expression.
void popCalcExpression() {
if (_expressionStack.length > 0) {
_expression = _expressionStack.removeLast();
} else {
_expression = new CalcExpression.Empty();
}
}
/// Set `resultExpression` to the currrent expression and clear the stack.
void setResult(CalcExpression resultExpression) {
_expressionStack.clear();
_expression = resultExpression;
}
void handleNumberTap(int n) {
final CalcExpression expression = _expression.appendDigit(n);
if (expression != null) {
setState(() {
pushExpression(expression);
});
}
}
void handlePointTap() {
final CalcExpression expression = _expression.appendPoint();
if (expression != null) {
setState(() {
pushExpression(expression);
});
}
}
void handlePlusTap() {
final CalcExpression expression = _expression.appendOperation(Operation.Addition);
if (expression != null) {
setState(() {
pushExpression(expression);
});
}
}
void handleMinusTap() {
final CalcExpression expression = _expression.appendMinus();
if (expression != null) {
setState(() {
pushExpression(expression);
});
}
}
void handleMultTap() {
final CalcExpression expression = _expression.appendOperation(Operation.Multiplication);
if (expression != null) {
setState(() {
pushExpression(expression);
});
}
}
void handleDivTap() {
final CalcExpression expression = _expression.appendOperation(Operation.Division);
if (expression != null) {
setState(() {
pushExpression(expression);
});
}
}
void handleEqualsTap() {
final CalcExpression resultExpression = _expression.computeResult();
if (resultExpression != null) {
setState(() {
setResult(resultExpression);
});
}
}
void handleDelTap() {
setState(() {
popCalcExpression();
});
}
@override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
backgroundColor: Theme.of(context).canvasColor,
elevation: 0
),
body: new Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
children: <Widget>[
// Give the key-pad 3/5 of the vertical space and the display 2/5.
new Flexible(
flex: 2,
child: new CalcDisplay(content: _expression.toString())
),
new Divider(height: 1.0),
new Flexible(
flex: 3,
child: new KeyPad(calcState: this)
)
]
)
);
}
}
class CalcDisplay extends StatelessWidget {
CalcDisplay({ this.content });
final String content;
@override
Widget build(BuildContext context) {
return new Center(
child: new Text(
content,
style: const TextStyle(fontSize: 24.0)
)
);
}
}
class KeyPad extends StatelessWidget {
KeyPad({ this.calcState });
final _CalculatorState calcState;
@override
Widget build(BuildContext context) {
final ThemeData themeData = new ThemeData(
primarySwatch: Colors.purple,
brightness: Brightness.dark
);
return new Theme(
data: themeData,
child: new Material(
child: new Row(
children: <Widget>[
new Flexible(
// We set flex equal to the number of columns so that the main keypad
// and the op keypad have sizes proportional to their number of
// columns.
flex: 3,
child: new Column(
children: <Widget>[
new KeyRow(<Widget>[
new NumberKey(7, calcState),
new NumberKey(8, calcState),
new NumberKey(9, calcState)
]),
new KeyRow(<Widget>[
new NumberKey(4, calcState),
new NumberKey(5, calcState),
new NumberKey(6, calcState)
]),
new KeyRow(<Widget>[
new NumberKey(1, calcState),
new NumberKey(2, calcState),
new NumberKey(3, calcState)
]),
new KeyRow(<Widget>[
new CalcKey('.', calcState.handlePointTap),
new NumberKey(0, calcState),
new CalcKey('=', calcState.handleEqualsTap),
])
]
)
),
new Flexible(
child: new Material(
color: themeData.backgroundColor,
child: new Column(
children: <Widget>[
new CalcKey('\u232B', calcState.handleDelTap),
new CalcKey('\u00F7', calcState.handleDivTap),
new CalcKey('\u00D7', calcState.handleMultTap),
new CalcKey('-', calcState.handleMinusTap),
new CalcKey('+', calcState.handlePlusTap)
]
)
)
),
]
)
)
);
}
}
class KeyRow extends StatelessWidget {
KeyRow(this.keys);
final List<Widget> keys;
@override
Widget build(BuildContext context) {
return new Flexible(
child: new Row(
mainAxisAlignment: MainAxisAlignment.center,
children: this.keys
)
);
}
}
class CalcKey extends StatelessWidget {
CalcKey(this.text, this.onTap);
final String text;
final GestureTapCallback onTap;
@override
Widget build(BuildContext context) {
final Orientation orientation = MediaQuery.of(context).orientation;
return new Flexible(
child: new InkResponse(
onTap: this.onTap,
child: new Center(
child: new Text(
this.text,
style: new TextStyle(
fontSize: (orientation == Orientation.portrait) ? 32.0 : 24.0
)
)
)
)
);
}
}
class NumberKey extends CalcKey {
NumberKey(int value, _CalculatorState calcState)
: super('$value', () {
calcState.handleNumberTap(value);
});
}

0
examples/flutter_gallery/lib/demo/calculator_logic.dart → examples/flutter_gallery/lib/demo/calculator/logic.dart
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282
examples/flutter_gallery/lib/demo/calculator_demo.dart
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@ -4,287 +4,13 @@
import 'package:flutter/material.dart';
import 'calculator_logic.dart';
import 'calculator/home.dart';
class Calculator extends StatefulWidget {
Calculator({Key key}) : super(key: key);
class CalculatorDemo extends StatelessWidget {
CalculatorDemo({Key key}) : super(key: key);
static const String routeName = '/calculator';
@override
_CalculatorState createState() => new _CalculatorState();
}
class _CalculatorState extends State<Calculator> {
/// As the user taps keys we update the current `_expression` and we also
/// keep a stack of previous expressions so we can return to earlier states
/// when the user hits the DEL key.
final List<CalcExpression> _expressionStack = <CalcExpression>[];
CalcExpression _expression = new CalcExpression.Empty();
// Make `expression` the current expression and push the previous current
// expression onto the stack.
void pushExpression(CalcExpression expression) {
_expressionStack.add(_expression);
_expression = expression;
}
/// Pop the top expression off of the stack and make it the current expression.
void popCalcExpression() {
if (_expressionStack.length > 0) {
_expression = _expressionStack.removeLast();
} else {
_expression = new CalcExpression.Empty();
}
}
/// Set `resultExpression` to the currrent expression and clear the stack.
void setResult(CalcExpression resultExpression) {
_expressionStack.clear();
_expression = resultExpression;
}
void handleNumberTap(int n) {
final CalcExpression expression = _expression.appendDigit(n);
if (expression != null) {
setState(() {
pushExpression(expression);
});
}
}
void handlePointTap() {
final CalcExpression expression = _expression.appendPoint();
if (expression != null) {
setState(() {
pushExpression(expression);
});
}
}
void handlePlusTap() {
final CalcExpression expression = _expression.appendOperation(Operation.Addition);
if (expression != null) {
setState(() {
pushExpression(expression);
});
}
}
void handleMinusTap() {
final CalcExpression expression = _expression.appendMinus();
if (expression != null) {
setState(() {
pushExpression(expression);
});
}
}
void handleMultTap() {
final CalcExpression expression = _expression.appendOperation(Operation.Multiplication);
if (expression != null) {
setState(() {
pushExpression(expression);
});
}
}
void handleDivTap() {
final CalcExpression expression = _expression.appendOperation(Operation.Division);
if (expression != null) {
setState(() {
pushExpression(expression);
});
}
}
void handleEqualsTap() {
final CalcExpression resultExpression = _expression.computeResult();
if (resultExpression != null) {
setState(() {
setResult(resultExpression);
});
}
}
void handleDelTap() {
setState(() {
popCalcExpression();
});
}
@override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(title: new Text('Calculator')),
body: new Column(
children: <Widget>[
// Give the key-pad 3/5 of the vertical space and the display 2/5.
new CalcDisplay(2, _expression.toString()),
new Divider(height: 1.0),
new KeyPad(3, calcState: this)
]
)
);
}
}
class CalcDisplay extends StatelessWidget {
CalcDisplay(this._flex, this._contents);
final int _flex;
final String _contents;
@override
Widget build(BuildContext context) {
return new Flexible(
flex: _flex,
child: new Center(
child: new Text(
_contents,
style: const TextStyle(fontSize: 24.0)
)
)
);
}
}
class KeyPad extends StatelessWidget {
KeyPad(this._flex, {this.calcState});
final int _flex;
final _CalculatorState calcState;
@override
Widget build(BuildContext context) {
return new Theme(
data: new ThemeData(
primarySwatch: Colors.purple,
brightness: Brightness.dark
),
child: new Flexible(
flex: _flex,
child: new Material(
child: new Row(
children: <Widget>[
new MainKeyPad(calcState: calcState),
new OpKeyPad(calcState: calcState),
]
)
)
)
);
}
}
class MainKeyPad extends StatelessWidget {
MainKeyPad({this.calcState});
final _CalculatorState calcState;
@override
Widget build(BuildContext context) {
return new Flexible(
// We set flex equal to the number of columns so that the main keypad
// and the op keypad have sizes proportional to their number of
// columns.
flex: 3,
child: new Column(
children: <Widget>[
new KeyRow(<Widget>[
new NumberKey(7, calcState),
new NumberKey(8, calcState),
new NumberKey(9, calcState)
]),
new KeyRow(<Widget>[
new NumberKey(4, calcState),
new NumberKey(5, calcState),
new NumberKey(6, calcState)
]),
new KeyRow(<Widget>[
new NumberKey(1, calcState),
new NumberKey(2, calcState),
new NumberKey(3, calcState)
]),
new KeyRow(<Widget>[
new CalcKey('.', calcState.handlePointTap),
new NumberKey(0, calcState),
new CalcKey('=', calcState.handleEqualsTap),
])
]
)
);
}
}
class OpKeyPad extends StatelessWidget {
OpKeyPad({this.calcState});
final _CalculatorState calcState;
@override
Widget build(BuildContext context) {
final ThemeData themeData = Theme.of(context);
return new Flexible(
child: new Material(
color: themeData.backgroundColor,
child: new Column(
children: <Widget>[
new CalcKey('\u232B', calcState.handleDelTap),
new CalcKey('\u00F7', calcState.handleDivTap),
new CalcKey('\u00D7', calcState.handleMultTap),
new CalcKey('-', calcState.handleMinusTap),
new CalcKey('+', calcState.handlePlusTap)
]
)
)
);
}
}
class KeyRow extends StatelessWidget {
KeyRow(this.keys);
final List<Widget> keys;
@override
Widget build(BuildContext context) {
return new Flexible(
child: new Row(
mainAxisAlignment: MainAxisAlignment.center, children: this.keys
)
);
}
}
class CalcKey extends StatelessWidget {
CalcKey(this.text, this.onTap);
final String text;
final GestureTapCallback onTap;
@override
Widget build(BuildContext context) {
final Orientation orientation = MediaQuery.of(context).orientation;
return new Flexible(
child: new InkResponse(
onTap: this.onTap,
child: new Center(
child: new Text(
this.text,
style: new TextStyle(
fontSize: (orientation == Orientation.portrait) ? 32.0 : 24.0
)
)
)
)
);
}
}
class NumberKey extends CalcKey {
NumberKey(int value, _CalculatorState calcState)
: super('$value', () {
calcState.handleNumberTap(value);
});
Widget build(BuildContext context) => new Calculator();
}

2
examples/flutter_gallery/lib/gallery/app.dart
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@ -12,7 +12,7 @@ import 'home.dart';
final Map<String, WidgetBuilder> kRoutes = <String, WidgetBuilder>{
PestoDemo.routeName: (BuildContext context) => new PestoDemo(),
ShrineDemo.routeName: (BuildContext context) => new ShrineDemo(),
Calculator.routeName: (BuildContext context) => new Calculator(),
CalculatorDemo.routeName: (BuildContext context) => new CalculatorDemo(),
ContactsDemo.routeName: (BuildContext context) => new ContactsDemo(),
ButtonsDemo.routeName: (BuildContext context) => new ButtonsDemo(),
CardsDemo.routeName: (BuildContext context) => new CardsDemo(),

2
examples/flutter_gallery/lib/gallery/home.dart
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@ -73,7 +73,7 @@ class GalleryHomeState extends State<GalleryHome> {
children: <Widget>[
new GalleryItem(title: 'Pesto', routeName: PestoDemo.routeName),
new GalleryItem(title: 'Shrine', routeName: ShrineDemo.routeName),
new GalleryItem(title: 'Calculator', routeName: Calculator.routeName),
new GalleryItem(title: 'Calculator', routeName: CalculatorDemo.routeName),
new GalleryItem(title: 'Contacts', routeName: ContactsDemo.routeName)
]
),

2
examples/flutter_gallery/test/calculator/logic.dart
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@ -2,7 +2,7 @@
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'package:flutter_gallery/demo/calculator_logic.dart';
import 'package:flutter_gallery/demo/calculator/logic.dart';
import 'package:test/test.dart';
void main() {

2
examples/flutter_gallery/test/calculator/smoke_test.dart
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@ -14,7 +14,7 @@ void main() {
// We press the "1" and the "2" buttons and check that the display
// reads "12".
testWidgets('Flutter calculator app smoke test', (WidgetTester tester) async {
await tester.pumpWidget(new Calculator());
await tester.pumpWidget(new CalculatorDemo());
Finder oneButton = find.widgetWithText(InkResponse, '1');
expect(oneButton, findsOneWidget);