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0b098ee2e5
Also, clean up the class hierarchy for AnimationController now that we've renamed progress to value. That means everything in the hierarchy now has a value, include Watchable. This patch renames Watchable to Animated<T>, which lets us use that type almost everywhere. I've added some ducktape to modal bottom sheets to avoid having to refactor all of Navigator to use AnimationController. I'll remove the ducktape in the next patch.
115 lines
3.0 KiB
Dart
115 lines
3.0 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/animation.dart';
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import 'package:flutter/material.dart';
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import 'package:flutter/rendering.dart';
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final List<Map<int, Color>> _kColors = <Map<int, Color>>[
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Colors.amber,
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Colors.yellow,
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Colors.blue,
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Colors.purple,
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Colors.indigo,
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Colors.deepOrange,
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];
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class SmoothBlock extends StatefulComponent {
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SmoothBlock({ this.color });
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final Map<int, Color> color;
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SmoothBlockState createState() => new SmoothBlockState();
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}
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class CardTransition extends StatelessComponent {
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CardTransition({
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this.child,
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this.animation,
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this.x,
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this.opacity,
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this.scale
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});
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final Widget child;
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final Animated<double> animation;
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final Evaluatable<double> x;
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final Evaluatable<double> opacity;
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final Evaluatable<double> scale;
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Widget build(BuildContext context) {
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return new AnimatedBuilder(
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animation: animation,
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builder: (BuildContext context) {
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double currentScale = scale.evaluate(animation);
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Matrix4 transform = new Matrix4.identity()
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..translate(x.evaluate(animation))
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..scale(currentScale, currentScale);
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return new Opacity(
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opacity: opacity.evaluate(animation),
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child: new Transform(
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transform: transform,
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child: child
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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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class SmoothBlockState extends State<SmoothBlock> {
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double _height = 100.0;
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Widget _handleEnter(Animated<double> animation, Widget child) {
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return new CardTransition(
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x: new Tween<double>(begin: -200.0, end: 0.0),
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opacity: new Tween<double>(begin: 0.0, end: 1.0),
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scale: new Tween<double>(begin: 0.8, end: 1.0),
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animation: new CurvedAnimation(parent: animation, curve: Curves.ease),
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child: child
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);
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}
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Widget _handleExit(Animated<double> animation, Widget child) {
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return new CardTransition(
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x: new Tween<double>(begin: 0.0, end: 200.0),
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opacity: new Tween<double>(begin: 1.0, end: 0.0),
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scale: new Tween<double>(begin: 1.0, end: 0.8),
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animation: new CurvedAnimation(parent: animation, curve: Curves.ease),
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child: child
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);
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}
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Widget build(BuildContext context) {
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return new GestureDetector(
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onTap: () {
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setState(() {
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_height = _height == 100.0 ? 200.0 : 100.0;
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});
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},
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child: new EnterExitTransition(
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duration: const Duration(milliseconds: 1500),
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onEnter: _handleEnter,
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onExit: _handleExit,
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child: new Container(
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key: new ValueKey(_height),
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height: _height,
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decoration: new BoxDecoration(backgroundColor: config.color[_height.floor() * 4])
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)
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)
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);
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}
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}
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class SmoothResizeDemo extends StatelessComponent {
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Widget build(BuildContext context) {
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return new Block(_kColors.map((Map<int, Color> color) => new SmoothBlock(color: color)).toList());
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}
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}
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void main() {
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runApp(new SmoothResizeDemo());
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}
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