forked from eatvio/eatvio_app
134 lines
4.2 KiB
Dart
134 lines
4.2 KiB
Dart
import 'dart:math' as math;
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import 'package:eatvio_app/generated/l10n.dart';
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import 'package:eatvio_app/core/theme/custom_text_style.dart';
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import 'package:eatvio_app/core/theme/theme_helper.dart';
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import 'package:eatvio_app/core/widgets/markdown_html_widget.dart';
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import 'package:flutter/material.dart';
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import 'package:flutter_svg/svg.dart';
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class ExpandableText extends StatefulWidget {
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final String text;
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final int maxLines;
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const ExpandableText({
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super.key,
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required this.text,
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this.maxLines = 5, // по умолчанию 5 строк
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});
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@override
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State<ExpandableText> createState() => _ExpandableTextState();
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}
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class _ExpandableTextState extends State<ExpandableText> {
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bool isExpanded = false;
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bool showExpandButton = false;
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final GlobalKey _textKey = GlobalKey();
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@override
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void didChangeDependencies() {
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super.didChangeDependencies();
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WidgetsBinding.instance.addPostFrameCallback((_) => _checkTextOverflow());
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}
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void _checkTextOverflow() {
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final textRenderObject = _textKey.currentContext?.findRenderObject();
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if (textRenderObject is RenderBox) {
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final fontSize = TextStyles.textMMediumAuto.fontSize ?? 16;
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final lineHeight = fontSize * 1.5;
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final maxLinesHeight = widget.maxLines * lineHeight;
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final actualHeight = textRenderObject.size.height;
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if (actualHeight > maxLinesHeight && !showExpandButton) {
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setState(() {
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showExpandButton = true;
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});
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}
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}
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}
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void toggleExpansion() {
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setState(() {
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isExpanded = !isExpanded;
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});
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}
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@override
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Widget build(BuildContext context) {
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final s = S.of(context);
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return Column(
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crossAxisAlignment: CrossAxisAlignment.start,
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children: [
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Padding(
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padding: const EdgeInsets.symmetric(horizontal: 16),
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child: AnimatedSize(
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duration: const Duration(milliseconds: 200),
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curve: Curves.easeInOut,
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child: Stack(
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children: [
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ClipRect(
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child: ConstrainedBox(
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constraints: BoxConstraints(
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maxHeight: isExpanded ? double.infinity : (widget.maxLines * (TextStyles.textMMediumAuto.fontSize ?? 16) * 1.5),
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),
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child: MarkdownHtmlWidget(
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key: _textKey,
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markdownText: widget.text,
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fontSize: TextStyles.textMMediumAuto.fontSize ?? 16,
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textColor: appTheme.black,
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),
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),
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),
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if (!isExpanded && showExpandButton)
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Positioned.fill(
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child: Align(
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alignment: Alignment.bottomCenter,
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child: Container(
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height: 35,
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decoration: BoxDecoration(
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gradient: LinearGradient(
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begin: Alignment.topCenter,
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end: Alignment.bottomCenter,
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colors: [
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Colors.white.withAlpha(0),
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Colors.white.withAlpha((255 * 0.6).toInt()),
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Colors.white,
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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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],
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),
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),
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),
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if (showExpandButton)
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Align(
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alignment: Alignment.bottomCenter,
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child: GestureDetector(
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onTap: toggleExpansion,
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child: Row(
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mainAxisAlignment: MainAxisAlignment.center,
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children: [
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Text(
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isExpanded ? s.hide : s.expand,
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style: TextStyles.textMMedium.copyWith(color: appTheme.blueA400),
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),
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const SizedBox(width: 4),
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Transform.rotate(
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angle: isExpanded ? math.pi : 0,
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child: SvgPicture.asset('assets/icons/arrow_down.svg', width: 12, height: 12),
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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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);
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}
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}
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