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398 lines
13 KiB
Dart
398 lines
13 KiB
Dart
// Copyright 2014 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'dart:math';
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import 'package:flutter/material.dart';
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import 'package:flutter/rendering.dart' show debugDumpRenderTree;
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class CardModel {
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CardModel(this.value, this.height) {
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textController = TextEditingController(text: 'Item $value');
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}
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int value;
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double height;
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int get color => ((value % 9) + 1) * 100;
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TextEditingController textController;
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Key get key => ObjectKey(this);
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}
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class CardCollection extends StatefulWidget {
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@override
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CardCollectionState createState() => CardCollectionState();
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}
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class CardCollectionState extends State<CardCollection> {
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static const TextStyle cardLabelStyle =
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TextStyle(color: Colors.white, fontSize: 18.0, fontWeight: FontWeight.bold);
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// TODO(hansmuller): need a local image asset
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static const String _sunshineURL = 'http://www.walltor.com/images/wallpaper/good-morning-sunshine-58540.jpg';
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static const double kCardMargins = 8.0;
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static const double kFixedCardHeight = 100.0;
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static const List<double> _cardHeights = <double>[
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48.0, 63.0, 85.0, 146.0, 60.0, 55.0, 84.0, 96.0, 50.0,
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48.0, 63.0, 85.0, 146.0, 60.0, 55.0, 84.0, 96.0, 50.0,
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48.0, 63.0, 85.0, 146.0, 60.0, 55.0, 84.0, 96.0, 50.0,
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];
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MaterialColor _primaryColor = Colors.deepPurple;
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List<CardModel> _cardModels;
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DismissDirection _dismissDirection = DismissDirection.horizontal;
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TextAlign _textAlign = TextAlign.center;
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bool _editable = false;
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bool _fixedSizeCards = false;
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bool _sunshine = false;
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bool _varyFontSizes = false;
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void _updateCardSizes() {
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if (_fixedSizeCards)
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return;
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_cardModels = List<CardModel>.generate(
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_cardModels.length,
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(int i) {
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_cardModels[i].height = _editable ? max(_cardHeights[i], 60.0) : _cardHeights[i];
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return _cardModels[i];
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},
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);
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}
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void _initVariableSizedCardModels() {
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_cardModels = List<CardModel>.generate(
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_cardHeights.length,
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(int i) => CardModel(i, _editable ? max(_cardHeights[i], 60.0) : _cardHeights[i]),
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);
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}
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void _initFixedSizedCardModels() {
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const int cardCount = 27;
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_cardModels = List<CardModel>.generate(
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cardCount,
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(int i) => CardModel(i, kFixedCardHeight),
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);
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}
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void _initCardModels() {
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if (_fixedSizeCards)
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_initFixedSizedCardModels();
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else
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_initVariableSizedCardModels();
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}
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@override
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void initState() {
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super.initState();
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_initCardModels();
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}
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void dismissCard(CardModel card) {
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if (_cardModels.contains(card)) {
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setState(() {
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_cardModels.remove(card);
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});
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}
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}
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Widget _buildDrawer() {
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return Drawer(
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child: IconTheme(
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data: const IconThemeData(color: Colors.black),
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child: ListView(
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children: <Widget>[
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const DrawerHeader(child: Center(child: Text('Options'))),
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buildDrawerCheckbox('Make card labels editable', _editable, _toggleEditable),
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buildDrawerCheckbox('Fixed size cards', _fixedSizeCards, _toggleFixedSizeCards),
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buildDrawerCheckbox('Let the sun shine', _sunshine, _toggleSunshine),
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buildDrawerCheckbox('Vary font sizes', _varyFontSizes, _toggleVaryFontSizes, enabled: !_editable),
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const Divider(),
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buildDrawerColorRadioItem('Deep Purple', Colors.deepPurple, _primaryColor, _selectColor),
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buildDrawerColorRadioItem('Green', Colors.green, _primaryColor, _selectColor),
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buildDrawerColorRadioItem('Amber', Colors.amber, _primaryColor, _selectColor),
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buildDrawerColorRadioItem('Teal', Colors.teal, _primaryColor, _selectColor),
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const Divider(),
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buildDrawerDirectionRadioItem('Dismiss horizontally', DismissDirection.horizontal, _dismissDirection, _changeDismissDirection, icon: Icons.code),
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buildDrawerDirectionRadioItem('Dismiss left', DismissDirection.endToStart, _dismissDirection, _changeDismissDirection, icon: Icons.arrow_back),
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buildDrawerDirectionRadioItem('Dismiss right', DismissDirection.startToEnd, _dismissDirection, _changeDismissDirection, icon: Icons.arrow_forward),
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const Divider(),
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buildFontRadioItem('Left-align text', TextAlign.left, _textAlign, _changeTextAlign, icon: Icons.format_align_left, enabled: !_editable),
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buildFontRadioItem('Center-align text', TextAlign.center, _textAlign, _changeTextAlign, icon: Icons.format_align_center, enabled: !_editable),
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buildFontRadioItem('Right-align text', TextAlign.right, _textAlign, _changeTextAlign, icon: Icons.format_align_right, enabled: !_editable),
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const Divider(),
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ListTile(
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leading: const Icon(Icons.dvr),
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onTap: () { debugDumpApp(); debugDumpRenderTree(); },
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title: const Text('Dump App to Console'),
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),
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],
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),
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),
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);
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}
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String _dismissDirectionText(DismissDirection direction) {
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final String s = direction.toString();
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return "dismiss ${s.substring(s.indexOf('.') + 1)}";
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}
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void _toggleEditable() {
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setState(() {
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_editable = !_editable;
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_updateCardSizes();
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});
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}
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void _toggleFixedSizeCards() {
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setState(() {
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_fixedSizeCards = !_fixedSizeCards;
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_initCardModels();
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});
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}
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void _toggleSunshine() {
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setState(() {
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_sunshine = !_sunshine;
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});
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}
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void _toggleVaryFontSizes() {
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setState(() {
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_varyFontSizes = !_varyFontSizes;
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});
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}
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void _selectColor(MaterialColor selection) {
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setState(() {
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_primaryColor = selection;
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});
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}
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void _changeDismissDirection(DismissDirection newDismissDirection) {
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setState(() {
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_dismissDirection = newDismissDirection;
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});
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}
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void _changeTextAlign(TextAlign newTextAlign) {
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setState(() {
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_textAlign = newTextAlign;
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});
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}
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Widget buildDrawerCheckbox(String label, bool value, void callback(), { bool enabled = true }) {
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return ListTile(
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onTap: enabled ? callback : null,
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title: Text(label),
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trailing: Checkbox(
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value: value,
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onChanged: enabled ? (_) { callback(); } : null,
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),
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);
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}
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Widget buildDrawerColorRadioItem(String label, MaterialColor itemValue, MaterialColor currentValue, ValueChanged<MaterialColor> onChanged, { IconData icon, bool enabled = true }) {
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return ListTile(
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leading: Icon(icon),
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title: Text(label),
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onTap: enabled ? () { onChanged(itemValue); } : null,
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trailing: Radio<MaterialColor>(
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value: itemValue,
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groupValue: currentValue,
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onChanged: enabled ? onChanged : null,
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),
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);
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}
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Widget buildDrawerDirectionRadioItem(String label, DismissDirection itemValue, DismissDirection currentValue, ValueChanged<DismissDirection> onChanged, { IconData icon, bool enabled = true }) {
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return ListTile(
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leading: Icon(icon),
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title: Text(label),
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onTap: enabled ? () { onChanged(itemValue); } : null,
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trailing: Radio<DismissDirection>(
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value: itemValue,
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groupValue: currentValue,
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onChanged: enabled ? onChanged : null,
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),
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);
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}
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Widget buildFontRadioItem(String label, TextAlign itemValue, TextAlign currentValue, ValueChanged<TextAlign> onChanged, { IconData icon, bool enabled = true }) {
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return ListTile(
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leading: Icon(icon),
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title: Text(label),
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onTap: enabled ? () { onChanged(itemValue); } : null,
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trailing: Radio<TextAlign>(
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value: itemValue,
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groupValue: currentValue,
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onChanged: enabled ? onChanged : null,
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),
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);
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}
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AppBar _buildAppBar(BuildContext context) {
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return AppBar(
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actions: <Widget>[
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Text(_dismissDirectionText(_dismissDirection)),
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],
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flexibleSpace: Container(
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padding: const EdgeInsets.only(left: 72.0),
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height: 128.0,
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alignment: const Alignment(-1.0, 0.5),
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child: Text('Swipe Away: ${_cardModels.length}', style: Theme.of(context).primaryTextTheme.headline6),
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),
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);
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}
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Widget _buildCard(BuildContext context, int index) {
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final CardModel cardModel = _cardModels[index];
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final Widget card = Dismissible(
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key: ObjectKey(cardModel),
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direction: _dismissDirection,
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onDismissed: (DismissDirection direction) { dismissCard(cardModel); },
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child: Card(
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color: _primaryColor[cardModel.color],
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child: Container(
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height: cardModel.height,
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padding: const EdgeInsets.all(kCardMargins),
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child: _editable ?
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Center(
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child: TextField(
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key: GlobalObjectKey(cardModel),
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controller: cardModel.textController,
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),
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)
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: DefaultTextStyle.merge(
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style: cardLabelStyle.copyWith(
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fontSize: _varyFontSizes ? 5.0 + index : null
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),
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child: Column(
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crossAxisAlignment: CrossAxisAlignment.stretch,
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mainAxisAlignment: MainAxisAlignment.center,
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children: <Widget>[
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Text(cardModel.textController.text, textAlign: _textAlign),
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],
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),
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),
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),
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),
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);
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String backgroundMessage;
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switch (_dismissDirection) {
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case DismissDirection.horizontal:
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backgroundMessage = 'Swipe in either direction';
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break;
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case DismissDirection.endToStart:
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backgroundMessage = 'Swipe left to dismiss';
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break;
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case DismissDirection.startToEnd:
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backgroundMessage = 'Swipe right to dismiss';
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break;
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default:
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backgroundMessage = 'Unsupported dismissDirection';
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}
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// TODO(abarth): This icon is wrong in RTL.
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Widget leftArrowIcon = const Icon(Icons.arrow_back, size: 36.0);
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if (_dismissDirection == DismissDirection.startToEnd)
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leftArrowIcon = Opacity(opacity: 0.1, child: leftArrowIcon);
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// TODO(abarth): This icon is wrong in RTL.
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Widget rightArrowIcon = const Icon(Icons.arrow_forward, size: 36.0);
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if (_dismissDirection == DismissDirection.endToStart)
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rightArrowIcon = Opacity(opacity: 0.1, child: rightArrowIcon);
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final ThemeData theme = Theme.of(context);
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final TextStyle backgroundTextStyle = theme.primaryTextTheme.headline6;
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// The background Widget appears behind the Dismissible card when the card
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// moves to the left or right. The Positioned widget ensures that the
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// size of the background,card Stack will be based only on the card. The
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// Viewport ensures that when the card's resize animation occurs, the
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// background (text and icons) will just be clipped, not resized.
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final Widget background = Positioned.fill(
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child: Container(
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margin: const EdgeInsets.all(4.0),
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child: SingleChildScrollView(
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child: Container(
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height: cardModel.height,
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color: theme.primaryColor,
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child: Row(
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children: <Widget>[
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leftArrowIcon,
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Expanded(
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child: Text(backgroundMessage,
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style: backgroundTextStyle,
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textAlign: TextAlign.center,
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),
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),
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rightArrowIcon,
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],
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),
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),
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),
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),
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);
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return IconTheme(
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key: cardModel.key,
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data: const IconThemeData(color: Colors.white),
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child: Stack(children: <Widget>[background, card]),
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);
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}
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Shader _createShader(Rect bounds) {
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return const LinearGradient(
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begin: Alignment.topCenter,
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end: Alignment.bottomCenter,
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colors: <Color>[Color(0x00FFFFFF), Color(0xFFFFFFFF)],
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stops: <double>[0.1, 0.35],
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)
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.createShader(bounds);
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}
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@override
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Widget build(BuildContext context) {
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Widget cardCollection = ListView.builder(
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itemExtent: _fixedSizeCards ? kFixedCardHeight : null,
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itemCount: _cardModels.length,
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itemBuilder: _buildCard,
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);
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if (_sunshine) {
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cardCollection = Stack(
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children: <Widget>[
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Column(children: <Widget>[Image.network(_sunshineURL)]),
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ShaderMask(child: cardCollection, shaderCallback: _createShader),
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],
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);
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}
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final Widget body = Container(
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padding: const EdgeInsets.symmetric(vertical: 12.0, horizontal: 8.0),
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color: _primaryColor.shade50,
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child: cardCollection,
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);
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return Theme(
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data: ThemeData(
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primarySwatch: _primaryColor,
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),
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child: Scaffold(
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appBar: _buildAppBar(context),
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drawer: _buildDrawer(),
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body: body,
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),
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);
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}
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}
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void main() {
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runApp(MaterialApp(
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title: 'Cards',
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home: CardCollection(),
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));
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}
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