mirror of
https://github.com/flutter/flutter.git
synced 2025-06-03 00:51:18 +00:00
e502e9c8f8
Anywhere that accepted IconData now accepts either an Icon or an ImageIcon. Places that used to take an IconData in an `icon` argument, notably IconButton and DrawerItem, now take a Widget in that slot. You can wrap the value that used to be passed in in an Icon constructor to get the same result. Icon itself now takes the icon as a positional argument, for brevity. ThemeData now has an iconTheme as well as a primaryIconTheme, the same way it has had a textTheme and primaryTextTheme for a while. IconTheme.of() always returns a value now (though that value itself may have nulls in it). It defaults to the ThemeData.iconTheme. IconThemeData.fallback() is a new method that returns an icon theme data structure with all fields filled in. IconTheme.merge() is a new constructor that takes a context and creates a widget that mixes in the new values with the inherited values. Most places that introduced an IconTheme widget now use IconTheme.merge. IconThemeData.merge and IconThemeData.copyWith act in a way analogous to the similarly-named members of TextStyle. ImageIcon is introduced. It acts like Icon but takes an ImageProvider instead of an IconData. Also: Fix the analyzer to actually check the stocks app.
476 lines
15 KiB
Dart
476 lines
15 KiB
Dart
// Copyright 2015 The Chromium 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 '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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inputValue = new InputValue(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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InputValue inputValue;
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Key get key => new 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() => new 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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const 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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final TextStyle backgroundTextStyle = Typography.white.title;
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Map<int, Color> _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 _snapToCenter = 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 _initVariableSizedCardModels() {
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List<double> cardHeights = <double>[
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48.0, 63.0, 82.0, 146.0, 60.0, 55.0, 84.0, 96.0, 50.0,
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48.0, 63.0, 82.0, 146.0, 60.0, 55.0, 84.0, 96.0, 50.0,
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48.0, 63.0, 82.0, 146.0, 60.0, 55.0, 84.0, 96.0, 50.0
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];
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_cardModels = new List<CardModel>.generate(
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cardHeights.length,
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(int i) => new CardModel(i, 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 = new List<CardModel>.generate(
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cardCount,
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(int i) => new 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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Iterable<int> get _cardIndices sync* {
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for (int i = 0; i < _cardModels.length; i += 1)
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yield i;
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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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double _variableSizeToSnapOffset(double scrollOffset) {
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double cumulativeHeight = 0.0;
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List<double> cumulativeHeights = _cardModels.map((CardModel card) {
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cumulativeHeight += card.height + kCardMargins;
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return cumulativeHeight;
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})
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.toList();
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double offsetForIndex(int i) {
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return (kCardMargins + _cardModels[i].height) / 2.0 + ((i == 0) ? 0.0 : cumulativeHeights[i - 1]);
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}
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for (int i = 0; i < cumulativeHeights.length; i++) {
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if (cumulativeHeights[i] >= scrollOffset)
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return offsetForIndex(i);
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}
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return offsetForIndex(cumulativeHeights.length - 1);
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}
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double _fixedSizeToSnapOffset(double scrollOffset) {
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int cardIndex = (scrollOffset.clamp(0.0, kFixedCardHeight * (_cardModels.length - 1)) / kFixedCardHeight).floor();
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return cardIndex * kFixedCardHeight + kFixedCardHeight * 0.5;
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}
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double _toSnapOffset(double scrollOffset, Size containerSize) {
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double halfHeight = containerSize.height / 2.0;
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scrollOffset += halfHeight;
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double result = _fixedSizeCards ? _fixedSizeToSnapOffset(scrollOffset) : _variableSizeToSnapOffset(scrollOffset);
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return result - halfHeight;
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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 new Drawer(
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child: new IconTheme(
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data: const IconThemeData(color: Colors.black),
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child: new Block(children: <Widget>[
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new DrawerHeader(content: new Center(child: new Text('Options'))),
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buildDrawerCheckbox("Make card labels editable", _editable, _toggleEditable),
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buildDrawerCheckbox("Snap fling scrolls to center", _snapToCenter, _toggleSnapToCenter),
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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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new 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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new 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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new 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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new Divider(),
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new DrawerItem(
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icon: new Icon(Icons.dvr),
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onPressed: () { debugDumpApp(); debugDumpRenderTree(); },
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child: new 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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String _dismissDirectionText(DismissDirection direction) {
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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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});
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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 _toggleSnapToCenter() {
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setState(() {
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_snapToCenter = !_snapToCenter;
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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(Map<int, Color> 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 new DrawerItem(
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onPressed: enabled ? callback : null,
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child: new Row(
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children: <Widget>[
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new Flexible(child: new Text(label)),
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new 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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);
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}
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Widget buildDrawerColorRadioItem(String label, Map<int, Color> itemValue, Map<int, Color> currentValue, ValueChanged<Map<int, Color>> onChanged, { IconData icon, bool enabled: true }) {
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return new DrawerItem(
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icon: new Icon(icon),
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onPressed: enabled ? () { onChanged(itemValue); } : null,
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child: new Row(
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children: <Widget>[
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new Flexible(child: new Text(label)),
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new Radio<Map<int, Color>>(
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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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);
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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 new DrawerItem(
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icon: new Icon(icon),
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onPressed: enabled ? () { onChanged(itemValue); } : null,
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child: new Row(
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children: <Widget>[
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new Flexible(child: new Text(label)),
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new 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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);
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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 new DrawerItem(
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icon: new Icon(icon),
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onPressed: enabled ? () { onChanged(itemValue); } : null,
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child: new Row(
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children: <Widget>[
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new Flexible(child: new Text(label)),
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new 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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);
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}
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Widget _buildAppBar(BuildContext context) {
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return new AppBar(
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actions: <Widget>[
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new Text(_dismissDirectionText(_dismissDirection))
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],
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flexibleSpace: new Container(
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padding: const EdgeInsets.only(left: 72.0),
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height: 128.0,
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child: new Align(
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alignment: const FractionalOffset(0.0, 0.75),
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child: new Text('Swipe Away: ${_cardModels.length}', style: Theme.of(context).primaryTextTheme.title)
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)
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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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if (index >= _cardModels.length)
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return null;
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CardModel cardModel = _cardModels[index];
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Widget card = new Dismissable(
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key: new ObjectKey(cardModel),
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direction: _dismissDirection,
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onDismissed: (DismissDirection direction) { dismissCard(cardModel); },
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child: new Card(
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color: _primaryColor[cardModel.color],
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child: new 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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new Center(
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child: new Input(
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key: new GlobalObjectKey(cardModel),
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value: cardModel.inputValue,
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onChanged: (InputValue value) {
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setState(() {
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cardModel.inputValue = value;
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});
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}
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)
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)
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: new DefaultTextStyle.inherit(
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context: context,
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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: new 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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new Text(cardModel.inputValue.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 = new Icon(Icons.arrow_back, size: 36.0);
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if (_dismissDirection == DismissDirection.startToEnd)
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leftArrowIcon = new Opacity(opacity: 0.1, child: leftArrowIcon);
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// TODO(abarth): This icon is wrong in RTL.
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Widget rightArrowIcon = new Icon(Icons.arrow_forward, size: 36.0);
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if (_dismissDirection == DismissDirection.endToStart)
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rightArrowIcon = new Opacity(opacity: 0.1, child: rightArrowIcon);
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// The background Widget appears behind the Dismissable 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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Widget background = new Positioned(
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top: 0.0,
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right: 0.0,
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bottom: 0.0,
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left: 0.0,
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child: new Container(
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margin: const EdgeInsets.all(4.0),
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child: new Viewport(
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child: new Container(
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height: cardModel.height,
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decoration: new BoxDecoration(backgroundColor: Theme.of(context).primaryColor),
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child: new Row(
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children: <Widget>[
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leftArrowIcon,
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new Flexible(
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child: new 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 new IconTheme(
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key: cardModel.key,
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data: const IconThemeData(color: Colors.white),
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child: new 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 new LinearGradient(
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begin: FractionalOffset.topLeft,
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end: FractionalOffset.bottomLeft,
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colors: <Color>[const Color(0x00FFFFFF), const 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;
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if (_fixedSizeCards) {
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cardCollection = new ScrollableList(
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snapOffsetCallback: _snapToCenter ? _toSnapOffset : null,
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itemExtent: kFixedCardHeight,
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children: _cardIndices.map/*<Widget>*/((int index) => _buildCard(context, index))
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);
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} else {
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cardCollection = new LazyBlock(
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delegate: new LazyBlockBuilder(builder: _buildCard),
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snapOffsetCallback: _snapToCenter ? _toSnapOffset : null
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);
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}
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if (_sunshine) {
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cardCollection = new Stack(
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children: <Widget>[
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new Column(children: <Widget>[new Image(image: new NetworkImage(_sunshineURL))]),
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new ShaderMask(child: cardCollection, shaderCallback: _createShader)
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]
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);
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}
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Widget body = new Container(
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padding: const EdgeInsets.symmetric(vertical: 12.0, horizontal: 8.0),
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decoration: new BoxDecoration(backgroundColor: _primaryColor[50]),
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child: cardCollection
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);
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if (_snapToCenter) {
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Widget indicator = new IgnorePointer(
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child: new Align(
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alignment: FractionalOffset.centerLeft,
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child: new Container(
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height: 1.0,
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decoration: new BoxDecoration(backgroundColor: const Color(0x80FFFFFF))
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)
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)
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);
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body = new Stack(children: <Widget>[body, indicator]);
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}
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return new Theme(
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data: new ThemeData(
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primarySwatch: _primaryColor
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),
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child: new 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(new MaterialApp(
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title: 'Cards',
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home: new CardCollection()
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));
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}
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