57 lines
1.6 KiB
Dart
57 lines
1.6 KiB
Dart
import 'package:flutter/cupertino.dart';
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import 'package:flutter/material.dart';
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import 'package:peach/config/Colors.dart';
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import 'package:peach/config/Index.dart';
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import 'package:peach/utils/_.dart';
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/*
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* 接受头部和内容，当页面向上滑动时内容部分到达顶部会定位
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* 并且当到达顶部是会触发回调函数
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*/
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class ContentPositioningLayout extends StatelessWidget {
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final Widget title;
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final Widget child;
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final double titleHeight;
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final double scrollHeight;
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const ContentPositioningLayout(
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{this.title, this.child, this.titleHeight = 45, this.scrollHeight = 0});
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static Color color = Colors.transparent;
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@override
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Widget build(BuildContext context) {
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ScrollController mController = new ScrollController();
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mController.addListener(() {
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if (scrollHeight == 0) {
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return;
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}
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if ((scrollHeight.truncate() - mController.offset.truncate()) <= 3) {
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color = ColorConfig.WhiteBackColor;
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} else {
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color = Colors.transparent;
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}
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});
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return Stack(
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children: <Widget>[
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Positioned(
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height: Screen.height(context),
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child: SingleChildScrollView(
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physics: BouncingScrollPhysics(),
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controller: mController,
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child: this.child,
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),
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),
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Positioned(
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height: Screen.setHeight(this.titleHeight) + Config.top,
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child: Container(
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padding: EdgeInsets.only(top: Config.top),
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decoration: BoxDecoration(color: color),
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child: this.title,
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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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