100 lines
3.2 KiB
Dart
100 lines
3.2 KiB
Dart
import 'package:flutter/gestures.dart';
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import 'package:flutter/material.dart';
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import 'package:flutter_screenutil/flutter_screenutil.dart';
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import 'package:get/get.dart';
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///文字超出一定行，自动隐藏，并添加入"...查看更多详情"为它设置点击事件
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class HideText extends StatefulWidget {
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HideText({
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required this.text, //正常字
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required this.style, //正常字样式
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required this.additionText, //附加字，如点击查看更多
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this.additionStyle, //附加字的样式
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this.maxLines = 3, //行数，不传 默认为3
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required this.maxWidth,
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this.additionUrl, //点击附加字跳转URL
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this.additionParams,
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this.onTap,//点击附加字跳转时携带的参数
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}) : assert(text != null),
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assert(additionText != null);
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final String text;
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final TextStyle style;
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final String? additionText;
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final TextStyle? additionStyle;
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final int? maxLines;
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final double maxWidth;
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final String? additionUrl;
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GestureTapCallback? onTap;
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final Map<String, dynamic>? additionParams;
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@override
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_HideTextState createState() => _HideTextState();
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}
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class _HideTextState extends State<HideText> {
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@override
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Widget build(BuildContext context) {
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return Container(
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// padding: const EdgeInsets.only(top: 10),
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child: _textPaint([TextSpan(text: widget.text, style : widget.style)]).didExceedMaxLines ? RichText(
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text: TextSpan(
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children: [
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TextSpan(
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text: "${widget.text.substring(0, _fontNum())}",
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style: widget.style,
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),
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TextSpan(
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children: [
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TextSpan(text: "...", style: widget.style),
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TextSpan(text: "${widget.additionText}", style: widget.additionStyle,recognizer: TapGestureRecognizer()
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..onTap =
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widget.onTap
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// if(isNotBlank(widget.additionUrl)) {
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// FlutterBoost.singleton.open(widget.additionUrl);
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// }additionUrl
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)
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],
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)
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]
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),
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) : Container( //未超出指定行数的话全部显示
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child: Text(
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widget.text,
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style: widget.style,
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),
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),
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);
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}
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TextPainter _textPaint(List<InlineSpan> children){
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return TextPainter(
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maxLines: widget.maxLines,
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text: TextSpan(
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children: children
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),
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textDirection: TextDirection.ltr)
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..layout(maxWidth: widget.maxWidth); //若新功能宽度不一致，可尝试修改，
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//UIUtils.screenWidth(context)是自定义的获取屏幕宽度的方法
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}
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int _fontNum(){ //计算最多可容纳正常字的数目，可优化
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int num = 0;
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int skip = 1;
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while(true){
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bool isExceed = widget.text.length < num + skip || _textPaint([TextSpan(text: widget.text.substring(0, num + skip) + "...", style: widget.style),
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TextSpan(text: widget.additionText, style: widget.additionStyle)]).didExceedMaxLines;
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if(!isExceed) {
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num = num + skip;
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skip *= 2;
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continue;
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}
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if(isExceed && skip == 1){
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return num;
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}
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skip = skip ~/ 2;
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}
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}
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}
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