オーディオ波形を作成する必要があるコンテナの行の上に範囲スライダーを作成しようとしていますが、どこから始めればよいのかわかりません...
主な問題は、範囲スライダーがコンテナーの行の真上にあり、「選択された」セクションで色が変わることです。
これが私が現在持っているものです:
画像と詳細を作成するためのコード。
class BeatLyricsPage extends StatefulWidget {
final Beat beat;
BeatLyricsPage(this.beat);
@override
_BeatLyricsPageState createState() => _BeatLyricsPageState(beat);
}
class _BeatLyricsPageState extends State<BeatLyricsPage> {
final Beat beat;
final _kPicHeight = 190.0;
// used in _buildPageHeading to add the beat key and beat bpm
Widget _buildBeatInfoItem(String text) => DecoratedBox(
decoration: BoxDecoration(
border: Border.all(color: MyColor.white, width: 1.0),
borderRadius: BorderRadius.circular(4.0),
),
child: Padding(
padding: EdgeInsets.symmetric(vertical: 3.0, horizontal: 12.0),
child: Text(text, style: TextStyle(color: MyColor.white, fontSize: 10.0, fontWeight: FontWeight.w600)),
),
);
final _kAudioControlsWidth = 180.0;
final _kAudioControlsHeight = 36.0;
final _kAudioControlsMainButtonSize = 56.0;
Widget _buildAudioControls(BuildContext context) => Positioned(
left: (MediaQuery.of(context).size.width / 2) - (_kAudioControlsWidth / 2),
top: _kPicHeight - (_kAudioControlsHeight / 2),
child: Stack(
overflow: Overflow.visible,
children: [
Container(
width: _kAudioControlsWidth,
height: _kAudioControlsHeight,
decoration: BoxDecoration(color: MyColor.darkGrey, borderRadius: BorderRadius.circular(100.0)),
padding: EdgeInsets.symmetric(horizontal: LayoutSpacing.sm),
child: Row(
children: [
CButtonLike(beatId: beat.id),
Spacer(),
GestureDetector(
behavior: HitTestBehavior.opaque,
child: Icon(BeatPulseIcons.cart),
onTap: () => Navigator.Push(context, MaterialPageRoute(builder: (_) => LicenseOptionsPage(beat))),
),
],
),
),
// ****** MAIN BUTTON (Play/Pause) ******
Positioned(
left: (_kAudioControlsWidth / 2) - (_kAudioControlsMainButtonSize / 2),
top: (_kAudioControlsHeight - _kAudioControlsMainButtonSize) / 2,
child: Container(
height: _kAudioControlsMainButtonSize,
width: _kAudioControlsMainButtonSize,
decoration: BoxDecoration(
gradient: LinearGradient(begin: Alignment.topLeft, colors: [MyColor.primary, Color(0xFFf80d0a)]),
borderRadius: BorderRadius.circular(100.0)),
child: CButtonPlay(),
),
)
],
),
);
Widget _buildWaveForm() {
// creates a random list of doubles, "fake data"
var rng = Random();
final List waveFormData = [];
for (var i = 0; i < 90; i++) {
waveFormData.add(rng.nextInt(45).toDouble());
}
// player bloc
final playerBloc = BlocProvider.getPlayerBloc(context);
// renders
return Container(
height: _kPicHeight,
padding: EdgeInsets.symmetric(vertical: LayoutSpacing.xxxl),
child: Row(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.end,
children: [
// current playing second
StreamBuilder<double>(
stream: playerBloc.playingSecond,
initialData: 0.0,
builder: (_, playingSecondSnapshot) {
// current beat playing
return StreamBuilder<Beat>(
stream: playerBloc.playingBeat,
builder: (_, playingBeatSnapshot) {
final playingBeat = playingBeatSnapshot.data;
// if the beat playing is the same as the beat selected for the lyrics, show playing seconds
if (playingBeat?.id == beat.id)
return Text(secondsToTime(playingSecondSnapshot.data), style: MyFontStyle.sizeXxs);
// otherwise show 0:00
else
return Text(secondsToTime(0), style: MyFontStyle.sizeXxs);
},
);
},
),
SizedBox(width: LayoutSpacing.xs),
Row(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.end,
children: waveFormData
.map((waveFormDataIndex) => Container(
height: waveFormDataIndex > 5.0 ? waveFormDataIndex : 5.0,
width: 2,
color: MyColor.white,
margin: EdgeInsets.only(right: 1),
))
.toList(),
),
SizedBox(width: LayoutSpacing.xs),
Text(secondsToTime(beat.length), style: MyFontStyle.sizeXxs),
],
),
);
}
Widget _buildPageHeading(BuildContext context, {@required String imageUrl}) => Stack(
children: [
Column(
children: [
Hero(
tag: MyKeys.makePlayerCoverKey(beat.id),
child: Opacity(
opacity: 0.3,
child: Container(
height: _kPicHeight,
decoration: BoxDecoration(
image: DecorationImage(image: CachedNetworkImageProvider(imageUrl), fit: BoxFit.cover),
),
),
),
),
Container(color: MyColor.background, height: LayoutSpacing.xl)
],
),
Padding(
padding: EdgeInsets.all(LayoutSpacing.xs),
child: Row(
mainAxisAlignment: MainAxisAlignment.end,
children: [
_buildBeatInfoItem(beat.key),
SizedBox(width: 4.0),
_buildBeatInfoItem('${beat.bpm} BPM'),
],
),
),
_buildAudioControls(context),
_buildWaveForm(),
],
);
}
カスタム範囲スライダーを作成するには、 GestureRecognizer を使用して、各スライダーの位置を StatefulWidget 内の変数に保存します。インデックスiのバーが範囲内にあるかどうかを判断するには、リミッターのピクセル位置を分割します(bar1
&bar2
以下のソースで)バーの幅で比較し、iと比較します。
残念ながら、私はあなたのコード例を扱うことができませんでした。代わりに、以下に示すように、最低限の例を作成しました。少し時間を取って読んでいただければ、アプリケーションに転送できると確信しています。
import 'Dart:math';
import 'package:flutter/material.Dart';
List<int> bars = [];
void main() {
// generate random bars
Random r = Random();
for (var i = 0; i < 50; i++) {
bars.add(r.nextInt(200));
}
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Home(),
);
}
}
class Home extends StatefulWidget {
@override
State<StatefulWidget> createState() => HomeState();
}
class HomeState extends State<Home> {
static const barWidth = 5.0;
double bar1Position = 60.0;
double bar2Position = 180.0;
@override
Widget build(BuildContext context) {
int i = 0;
return Scaffold(
body: Center(
child: Stack(
alignment: Alignment.centerLeft,
children: <Widget>[
Row(
crossAxisAlignment: CrossAxisAlignment.center,
mainAxisAlignment: MainAxisAlignment.start,
children: bars.map((int height) {
Color color =
i >= bar1Position / barWidth && i <= bar2Position / barWidth
? Colors.deepPurple
: Colors.blueGrey;
i++;
return Container(
color: color,
height: height.toDouble(),
width: 5.0,
);
}).toList(),
),
Bar(
position: bar2Position,
callback: (DragUpdateDetails details) {
setState(() {
bar2Position += details.delta.dx;
});
},
),
Bar(
position: bar1Position,
callback: (DragUpdateDetails details) {
setState(() {
bar1Position += details.delta.dx;
});
},
),
],
),
),
);
}
}
class Bar extends StatelessWidget {
final double position;
final GestureDragUpdateCallback callback;
Bar({this.position, this.callback});
@override
Widget build(BuildContext context) {
return Padding(
padding: EdgeInsets.only(left: position >= 0.0 ? position : 0.0),
child: GestureDetector(
onHorizontalDragUpdate: callback,
child: Container(
color: Colors.red,
height: 200.0,
width: 5.0,
),
),
);
}
}
ウェーブスライダーを使用するには:
class WaveSlider extends StatefulWidget {
final double initialBarPosition;
final double barWidth;
final int maxBarHight;
final double width;
WaveSlider({
this.initialBarPosition = 0.0,
this.barWidth = 5.0,
this.maxBarHight = 50,
this.width = 60.0,
});
@override
State<StatefulWidget> createState() => WaveSliderState();
}
class WaveSliderState extends State<WaveSlider> {
List<int> bars = [];
double barPosition;
double barWidth;
int maxBarHight;
double width;
int numberOfBars;
void randomNumberGenerator() {
Random r = Random();
for (var i = 0; i < numberOfBars; i++) {
bars.add(r.nextInt(maxBarHight - 10) + 10);
}
}
_onTapDown(TapDownDetails details) {
var x = details.globalPosition.dx;
print("tap down " + x.toString());
setState(() {
barPosition = x;
});
}
@override
void initState() {
super.initState();
barPosition = widget.initialBarPosition;
barWidth = widget.barWidth;
maxBarHight = widget.maxBarHight.toInt();
width = widget.width;
if (bars.isNotEmpty) bars = [];
numberOfBars = width ~/ barWidth;
randomNumberGenerator();
}
@override
Widget build(BuildContext context) {
int barItem = 0;
return Scaffold(
backgroundColor: Colors.grey[900],
body: Center(
child: GestureDetector(
onTapDown: (TapDownDetails details) => _onTapDown(details),
onHorizontalDragUpdate: (DragUpdateDetails details) {
setState(() {
barPosition = details.globalPosition.dx;
});
},
child: Container(
child: Row(
crossAxisAlignment: CrossAxisAlignment.end,
mainAxisAlignment: MainAxisAlignment.start,
children: bars.map((int height) {
Color color = barItem + 1 < barPosition / barWidth
? Colors.white
: Colors.grey[600];
barItem++;
return Row(
children: <Widget>[
Container(
width: .1,
height: height.toDouble(),
color: Colors.black,
),
Container(
decoration: BoxDecoration(
color: color,
borderRadius: BorderRadius.only(
topLeft: const Radius.circular(1.0),
topRight: const Radius.circular(1.0),
),
),
height: height.toDouble(),
width: 4.8,
),
Container(
width: .1,
height: height.toDouble(),
color: Colors.black,
),
],
);
}).toList(),
),
),
),
),
);
}
}
そしてそれを次のように使用します:
WaveSlider(
initialBarPosition: 180.0,
barWidth: 5.0,
maxBarHight: 50,
width: MediaQuery.of(context).size.width,
)