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101 lines
2.9 KiB
Dart
101 lines
2.9 KiB
Dart
import 'package:flutter/material.dart';
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class ExpandableSection extends StatefulWidget {
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const ExpandableSection({
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super.key,
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required this.title,
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required this.child,
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this.initiallyOpen = false,
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this.forceOpen,
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this.highlightQuery,
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});
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final String title;
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final Widget child;
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final bool initiallyOpen;
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final bool? forceOpen;
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final String? highlightQuery;
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@override
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State<ExpandableSection> createState() => _ExpandableSectionState();
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}
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class _ExpandableSectionState extends State<ExpandableSection> {
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late bool _open = widget.initiallyOpen;
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@override
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void didUpdateWidget(covariant ExpandableSection oldWidget) {
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super.didUpdateWidget(oldWidget);
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// If forceOpen toggles from null to a value or changes, reflect it
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if (widget.forceOpen != null && widget.forceOpen != oldWidget.forceOpen) {
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_open = widget.forceOpen!;
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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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return Column(
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crossAxisAlignment: CrossAxisAlignment.start,
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children: [
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InkWell(
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enableFeedback: false,
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borderRadius: BorderRadius.circular(3),
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onTap: () {
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if (widget.forceOpen == null) {
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setState(() => _open = !_open);
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}
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},
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child: Padding(
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padding: const EdgeInsets.symmetric(horizontal: 4),
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child: Row(
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children: [
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Expanded(child: _buildTitle(context)),
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Icon(
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(widget.forceOpen ?? _open)
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? Icons.keyboard_arrow_up
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: Icons.keyboard_arrow_down,
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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 (widget.forceOpen ?? _open)
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Padding(
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padding: const EdgeInsets.fromLTRB(12, 0, 12, 12),
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child: widget.child,
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),
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],
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);
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}
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Widget _buildTitle(BuildContext context) {
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final q = widget.highlightQuery?.trim();
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final style = Theme.of(context).textTheme.titleSmall;
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if (q == null || q.isEmpty) {
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return Text(widget.title, style: style);
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}
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final lower = widget.title.toLowerCase();
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final lowerQ = q.toLowerCase();
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final spans = <TextSpan>[];
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int start = 0;
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int idx;
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final hlStyle = style?.copyWith(
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background: Paint()
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..color = Theme.of(context)
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.colorScheme
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.tertiaryContainer
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.withValues(alpha: 0.8),
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fontWeight: FontWeight.w600,
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);
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while ((idx = lower.indexOf(lowerQ, start)) != -1) {
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if (idx > start) spans.add(TextSpan(text: widget.title.substring(start, idx), style: style));
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spans.add(TextSpan(text: widget.title.substring(idx, idx + lowerQ.length), style: hlStyle));
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start = idx + lowerQ.length;
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}
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if (start < widget.title.length) {
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spans.add(TextSpan(text: widget.title.substring(start), style: style));
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}
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return RichText(text: TextSpan(children: spans, style: style));
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}
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}
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