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// Copyright 2014 The Flutter 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 'dart:math';
import 'package:flutter/material.dart';
class CardModel {
CardModel(this.value, this.height) :
textController = TextEditingController(text: 'Item $value');
int value;
double height;
int get color => ((value % 9) + 1) * 100;
final TextEditingController textController;
Key get key => ObjectKey(this);
}
class CardCollection extends StatefulWidget {
const CardCollection({super.key});
@override
CardCollectionState createState() => CardCollectionState();
}
class CardCollectionState extends State<CardCollection> {
static const TextStyle cardLabelStyle =
TextStyle(color: Colors.white, fontSize: 18.0, fontWeight: FontWeight.bold);
// TODO(hansmuller): need a local image asset
static const String _sunshineURL = 'http://www.walltor.com/images/wallpaper/good-morning-sunshine-58540.jpg';
static const double kCardMargins = 8.0;
static const double kFixedCardHeight = 100.0;
static const List<double> _cardHeights = <double>[
48.0, 63.0, 85.0, 146.0, 60.0, 55.0, 84.0, 96.0, 50.0,
48.0, 63.0, 85.0, 146.0, 60.0, 55.0, 84.0, 96.0, 50.0,
48.0, 63.0, 85.0, 146.0, 60.0, 55.0, 84.0, 96.0, 50.0,
];
MaterialColor _primaryColor = Colors.deepPurple;
List<CardModel> _cardModels = <CardModel>[];
DismissDirection _dismissDirection = DismissDirection.horizontal;
TextAlign _textAlign = TextAlign.center;
bool _editable = false;
bool _fixedSizeCards = false;
bool _sunshine = false;
bool _varyFontSizes = false;
void _updateCardSizes() {
if (_fixedSizeCards) {
return;
}
_cardModels = List<CardModel>.generate(
_cardModels.length,
(int i) {
_cardModels[i].height = _editable ? max(_cardHeights[i], 60.0) : _cardHeights[i];
return _cardModels[i];
},
);
}
void _initVariableSizedCardModels() {
_cardModels = List<CardModel>.generate(
_cardHeights.length,
(int i) => CardModel(i, _editable ? max(_cardHeights[i], 60.0) : _cardHeights[i]),
);
}
void _initFixedSizedCardModels() {
const int cardCount = 27;
_cardModels = List<CardModel>.generate(
cardCount,
(int i) => CardModel(i, kFixedCardHeight),
);
}
void _initCardModels() {
if (_fixedSizeCards) {
_initFixedSizedCardModels();
} else {
_initVariableSizedCardModels();
}
}
@override
void initState() {
super.initState();
_initCardModels();
}
void dismissCard(CardModel card) {
if (_cardModels.contains(card)) {
setState(() {
_cardModels.remove(card);
});
}
}
Widget _buildDrawer() {
return Drawer(
child: IconTheme(
data: const IconThemeData(color: Colors.black),
child: ListView(
children: <Widget>[
const DrawerHeader(child: Center(child: Text('Options'))),
buildDrawerCheckbox('Make card labels editable', _editable, _toggleEditable),
buildDrawerCheckbox('Fixed size cards', _fixedSizeCards, _toggleFixedSizeCards),
buildDrawerCheckbox('Let the sun shine', _sunshine, _toggleSunshine),
buildDrawerCheckbox('Vary font sizes', _varyFontSizes, _toggleVaryFontSizes, enabled: !_editable),
const Divider(),
buildDrawerColorRadioItem('Deep Purple', Colors.deepPurple, _primaryColor, _selectColor),
buildDrawerColorRadioItem('Green', Colors.green, _primaryColor, _selectColor),
buildDrawerColorRadioItem('Amber', Colors.amber, _primaryColor, _selectColor),
buildDrawerColorRadioItem('Teal', Colors.teal, _primaryColor, _selectColor),
const Divider(),
buildDrawerDirectionRadioItem('Dismiss horizontally', DismissDirection.horizontal, _dismissDirection, _changeDismissDirection, icon: Icons.code),
buildDrawerDirectionRadioItem('Dismiss left', DismissDirection.endToStart, _dismissDirection, _changeDismissDirection, icon: Icons.arrow_back),
buildDrawerDirectionRadioItem('Dismiss right', DismissDirection.startToEnd, _dismissDirection, _changeDismissDirection, icon: Icons.arrow_forward),
const Divider(),
buildFontRadioItem('Left-align text', TextAlign.left, _textAlign, _changeTextAlign, icon: Icons.format_align_left, enabled: !_editable),
buildFontRadioItem('Center-align text', TextAlign.center, _textAlign, _changeTextAlign, icon: Icons.format_align_center, enabled: !_editable),
buildFontRadioItem('Right-align text', TextAlign.right, _textAlign, _changeTextAlign, icon: Icons.format_align_right, enabled: !_editable),
const Divider(),
ListTile(
leading: const Icon(Icons.dvr),
onTap: () { debugDumpApp(); debugDumpRenderTree(); },
title: const Text('Dump App to Console'),
),
],
),
),
);
}
String _dismissDirectionText(DismissDirection direction) {
final String s = direction.toString();
return "dismiss ${s.substring(s.indexOf('.') + 1)}";
}
void _toggleEditable() {
setState(() {
_editable = !_editable;
_updateCardSizes();
});
}
void _toggleFixedSizeCards() {
setState(() {
_fixedSizeCards = !_fixedSizeCards;
_initCardModels();
});
}
void _toggleSunshine() {
setState(() {
_sunshine = !_sunshine;
});
}
void _toggleVaryFontSizes() {
setState(() {
_varyFontSizes = !_varyFontSizes;
});
}
void _selectColor(MaterialColor? selection) {
setState(() {
_primaryColor = selection!;
});
}
void _changeDismissDirection(DismissDirection? newDismissDirection) {
setState(() {
_dismissDirection = newDismissDirection!;
});
}
void _changeTextAlign(TextAlign? newTextAlign) {
setState(() {
_textAlign = newTextAlign!;
});
}
Widget buildDrawerCheckbox(String label, bool value, void Function() callback, { bool enabled = true }) {
return ListTile(
onTap: enabled ? callback : null,
title: Text(label),
trailing: Checkbox(
value: value,
onChanged: enabled ? (_) { callback(); } : null,
),
);
}
Widget buildDrawerColorRadioItem(String label, MaterialColor itemValue, MaterialColor currentValue, ValueChanged<MaterialColor?> onChanged, { IconData? icon, bool enabled = true }) {
return ListTile(
leading: Icon(icon),
title: Text(label),
onTap: enabled ? () { onChanged(itemValue); } : null,
trailing: Radio<MaterialColor>(
value: itemValue,
groupValue: currentValue,
onChanged: enabled ? onChanged : null,
),
);
}
Widget buildDrawerDirectionRadioItem(String label, DismissDirection itemValue, DismissDirection currentValue, ValueChanged<DismissDirection?> onChanged, { IconData? icon, bool enabled = true }) {
return ListTile(
leading: Icon(icon),
title: Text(label),
onTap: enabled ? () { onChanged(itemValue); } : null,
trailing: Radio<DismissDirection>(
value: itemValue,
groupValue: currentValue,
onChanged: enabled ? onChanged : null,
),
);
}
Widget buildFontRadioItem(String label, TextAlign itemValue, TextAlign currentValue, ValueChanged<TextAlign?> onChanged, { IconData? icon, bool enabled = true }) {
return ListTile(
leading: Icon(icon),
title: Text(label),
onTap: enabled ? () { onChanged(itemValue); } : null,
trailing: Radio<TextAlign>(
value: itemValue,
groupValue: currentValue,
onChanged: enabled ? onChanged : null,
),
);
}
AppBar _buildAppBar(BuildContext context) {
return AppBar(
actions: <Widget>[
Text(_dismissDirectionText(_dismissDirection)),
],
flexibleSpace: Container(
padding: const EdgeInsets.only(left: 72.0),
height: 128.0,
alignment: const Alignment(-1.0, 0.5),
child: Text('Swipe Away: ${_cardModels.length}', style: Theme.of(context).primaryTextTheme.titleLarge),
),
);
}
Widget _buildCard(BuildContext context, int index) {
final CardModel cardModel = _cardModels[index];
final Widget card = Dismissible(
key: ObjectKey(cardModel),
direction: _dismissDirection,
onDismissed: (DismissDirection direction) { dismissCard(cardModel); },
child: Card(
color: _primaryColor[cardModel.color],
child: Container(
height: cardModel.height,
padding: const EdgeInsets.all(kCardMargins),
child: _editable ?
Center(
child: TextField(
key: GlobalObjectKey(cardModel),
controller: cardModel.textController,
),
)
: DefaultTextStyle.merge(
style: cardLabelStyle.copyWith(
fontSize: _varyFontSizes ? 5.0 + index : null
),
child: Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text(cardModel.textController.text, textAlign: _textAlign),
],
),
),
),
),
);
String backgroundMessage;
switch (_dismissDirection) {
case DismissDirection.horizontal:
backgroundMessage = 'Swipe in either direction';
case DismissDirection.endToStart:
backgroundMessage = 'Swipe left to dismiss';
case DismissDirection.startToEnd:
backgroundMessage = 'Swipe right to dismiss';
case DismissDirection.vertical:
case DismissDirection.up:
case DismissDirection.down:
case DismissDirection.none:
backgroundMessage = 'Unsupported dismissDirection';
}
// This icon is wrong in RTL.
Widget leftArrowIcon = const Icon(Icons.arrow_back, size: 36.0);
if (_dismissDirection == DismissDirection.startToEnd) {
leftArrowIcon = Opacity(opacity: 0.1, child: leftArrowIcon);
}
// This icon is wrong in RTL.
Widget rightArrowIcon = const Icon(Icons.arrow_forward, size: 36.0);
if (_dismissDirection == DismissDirection.endToStart) {
rightArrowIcon = Opacity(opacity: 0.1, child: rightArrowIcon);
}
final ThemeData theme = Theme.of(context);
final TextStyle? backgroundTextStyle = theme.primaryTextTheme.titleLarge;
// The background Widget appears behind the Dismissible card when the card
// moves to the left or right. The Positioned widget ensures that the
// size of the background,card Stack will be based only on the card. The
// Viewport ensures that when the card's resize animation occurs, the
// background (text and icons) will just be clipped, not resized.
final Widget background = Positioned.fill(
child: Container(
margin: const EdgeInsets.all(4.0),
child: SingleChildScrollView(
child: Container(
height: cardModel.height,
color: theme.primaryColor,
child: Row(
children: <Widget>[
leftArrowIcon,
Expanded(
child: Text(backgroundMessage,
style: backgroundTextStyle,
textAlign: TextAlign.center,
),
),
rightArrowIcon,
],
),
),
),
),
);
return IconTheme(
key: cardModel.key,
data: const IconThemeData(color: Colors.white),
child: Stack(children: <Widget>[background, card]),
);
}
Shader _createShader(Rect bounds) {
return const LinearGradient(
begin: Alignment.topCenter,
end: Alignment.bottomCenter,
colors: <Color>[Color(0x00FFFFFF), Color(0xFFFFFFFF)],
stops: <double>[0.1, 0.35],
)
.createShader(bounds);
}
@override
Widget build(BuildContext context) {
Widget cardCollection = ListView.builder(
itemExtent: _fixedSizeCards ? kFixedCardHeight : null,
itemCount: _cardModels.length,
itemBuilder: _buildCard,
);
if (_sunshine) {
cardCollection = Stack(
children: <Widget>[
Column(children: <Widget>[Image.network(_sunshineURL)]),
ShaderMask(shaderCallback: _createShader, child: cardCollection),
],
);
}
final Widget body = Container(
padding: const EdgeInsets.symmetric(vertical: 12.0, horizontal: 8.0),
color: _primaryColor.shade50,
child: cardCollection,
);
return Theme(
data: ThemeData(
primarySwatch: _primaryColor,
),
child: Scaffold(
appBar: _buildAppBar(context),
drawer: _buildDrawer(),
body: body,
),
);
}
}
void main() {
runApp(const MaterialApp(
title: 'Cards',
home: CardCollection(),
));
}