babe380f0d
Setting a ProgressIndicator's value to null (the default) makes it an "indeterminate progress" or activity indicator. The indeterminate animations for both kinds of progress bars are essentially the same and wrong vis the Material Design spec, http://www.google.com/design/spec/components/progress-activity.html. I'll improve conformity with the visual design in a future CL.
124 lines
3.7 KiB
Dart
124 lines
3.7 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 'dart:sky' as sky;
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import 'package:sky/animation/animation_performance.dart';
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import 'package:sky/animation/animated_value.dart';
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import 'package:sky/animation/curves.dart';
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import 'package:sky/theme/colors.dart';
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import 'package:sky/widgets/basic.dart';
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import 'package:sky/widgets/icon.dart';
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import 'package:sky/widgets/progress_indicator.dart';
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import 'package:sky/widgets/scaffold.dart';
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import 'package:sky/widgets/theme.dart';
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import 'package:sky/widgets/tool_bar.dart';
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import 'package:sky/widgets/framework.dart';
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import 'package:sky/widgets/task_description.dart';
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import 'package:sky/widgets/transitions.dart';
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class ProgressIndicatorApp extends App {
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AnimationPerformance valueAnimation;
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Direction valueAnimationDirection = Direction.forward;
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void initState() {
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super.initState();
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valueAnimation = new AnimationPerformance()
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..duration = const Duration(milliseconds: 1500)
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..variable = new AnimatedValue<double>(
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0.0,
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end: 1.0,
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curve: ease,
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reverseCurve: ease,
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interval: new Interval(0.0, 0.9)
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);
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}
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void handleTap(sky.GestureEvent event) {
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if (valueAnimation.isAnimating)
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valueAnimation.stop();
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else
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valueAnimation.resume();
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}
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void reverseValueAnimationDirection() {
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setState(() {
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valueAnimationDirection = (valueAnimationDirection == Direction.forward)
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? Direction.reverse
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: Direction.forward;
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});
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}
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Widget buildIndicators() {
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List<Widget> indicators = <Widget>[
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new SizedBox(
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width: 200.0,
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child: new LinearProgressIndicator()
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),
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new LinearProgressIndicator(),
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new LinearProgressIndicator(),
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new LinearProgressIndicator(value: valueAnimation.variable.value),
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new CircularProgressIndicator(),
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new SizedBox(
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width: 20.0,
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height: 20.0,
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child: new CircularProgressIndicator(value: valueAnimation.variable.value)
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),
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new SizedBox(
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width: 50.0,
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height: 30.0,
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child: new CircularProgressIndicator(value: valueAnimation.variable.value)
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)
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];
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return new Flex(
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indicators
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.map((c) => new Container(child: c, margin: const EdgeDims.symmetric(vertical: 20.0)))
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.toList(),
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direction: FlexDirection.vertical,
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justifyContent: FlexJustifyContent.center
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);
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}
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Widget build() {
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Widget body = new Listener(
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onGestureTap: (e) { handleTap(e); },
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child: new Container(
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padding: const EdgeDims.symmetric(vertical: 12.0, horizontal: 8.0),
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decoration: new BoxDecoration(backgroundColor: Theme.of(this).cardColor),
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child: new BuilderTransition(
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variables: [valueAnimation.variable],
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direction: valueAnimationDirection,
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performance: valueAnimation,
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onDismissed: reverseValueAnimationDirection,
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onCompleted: reverseValueAnimationDirection,
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builder: buildIndicators
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)
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)
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);
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return new IconTheme(
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data: const IconThemeData(color: IconThemeColor.white),
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child: new Theme(
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data: new ThemeData(
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brightness: ThemeBrightness.light,
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primarySwatch: Blue,
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accentColor: RedAccent[200]
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),
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child: new TaskDescription(
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label: 'Cards',
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child: new Scaffold(
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toolbar: new ToolBar(center: new Text('Progress Indicators')),
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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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}
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}
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void main() {
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runApp(new ProgressIndicatorApp());
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}
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