feature(core):добавлен формат текста

2025-11-05 14:58:05 +03:00
parent 6d04c0ada0
commit 84aefe0d35
11 changed files with 526 additions and 1382 deletions
--- a/lib/widgets/markdown_readmore_text.dart
+++ b/lib/widgets/markdown_readmore_text.dart
@@ -0,0 +1,168 @@
+import 'package:flutter/material.dart';
+
+class MarkdownReadMoreText extends StatefulWidget {
+  final String text;
+  final int trimLines;
+  final TextStyle style;
+  final TextStyle linkStyle;
+  final String expandText;
+  final String collapseText;
+
+  const MarkdownReadMoreText(
+    this.text, {
+    super.key,
+    this.trimLines = 3,
+    required this.style,
+    required this.linkStyle,
+    this.expandText = 'Развернуть',
+    this.collapseText = 'Свернуть',
+  });
+
+  @override
+  State<MarkdownReadMoreText> createState() => _MarkdownReadMoreTextState();
+}
+
+class _MarkdownReadMoreTextState extends State<MarkdownReadMoreText> {
+  bool _isExpanded = false;
+
+  @override
+  Widget build(BuildContext context) {
+    final spans = _parseMarkdown(widget.text);
+    final fullText = TextSpan(children: spans, style: widget.style);
+
+    return LayoutBuilder(
+      builder: (context, constraints) {
+        final textPainter = TextPainter(
+          text: fullText,
+          maxLines: widget.trimLines,
+          textDirection: TextDirection.ltr,
+        )..layout(maxWidth: constraints.maxWidth);
+
+        final isOverflowed = textPainter.didExceedMaxLines;
+
+        if (!isOverflowed) {
+          return SelectableText.rich(fullText);
+        }
+
+        return Column(
+          crossAxisAlignment: CrossAxisAlignment.start,
+          children: [
+            SelectableText.rich(
+              _isExpanded ? fullText : _getTrimmedSpan(textPainter, spans),
+            ),
+            GestureDetector(
+              onTap: () => setState(() => _isExpanded = !_isExpanded),
+              child: Text(
+                _isExpanded ? widget.collapseText : widget.expandText,
+                style: widget.linkStyle,
+              ),
+            ),
+          ],
+        );
+      },
+    );
+  }
+
+  TextSpan _getTrimmedSpan(TextPainter painter, List<TextSpan> spans) {
+    final trimmedText = StringBuffer();
+    final remainingSpans = <TextSpan>[];
+
+    int charCount = 0;
+    final maxChars =
+        painter
+            .getPositionForOffset(Offset(painter.width, painter.height))
+            .offset;
+
+    for (final span in spans) {
+      final spanText = span.text ?? '';
+      if (charCount + spanText.length <= maxChars) {
+        remainingSpans.add(span);
+        charCount += spanText.length;
+      } else {
+        final remaining = maxChars - charCount;
+        if (remaining > 0) {
+          remainingSpans.add(
+            TextSpan(text: spanText.substring(0, remaining), style: span.style),
+          );
+        }
+        break;
+      }
+    }
+
+    return TextSpan(children: remainingSpans, style: widget.style);
+  }
+
+  List<TextSpan> _parseMarkdown(String text) {
+    final lines = text.split('\n');
+    final spans = <TextSpan>[];
+
+    for (var line in lines) {
+      final trimmed = line.trim();
+
+      // H1
+      if (trimmed.startsWith('# ') && trimmed.length > 2) {
+        spans.add(
+          TextSpan(
+            text: '${trimmed.substring(2)}\n',
+            style: const TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
+          ),
+        );
+        continue;
+      }
+
+      // Нумерованный список
+      if (RegExp(r'^\d+\.\s').hasMatch(trimmed)) {
+        final match = RegExp(r'^(\d+)\.\s(.+)').firstMatch(trimmed);
+        if (match != null) {
+          spans.add(
+            TextSpan(
+              text: '${match.group(0)!}\n',
+              style: const TextStyle(fontSize: 16),
+            ),
+          );
+          continue;
+        }
+      }
+
+      // Маркированный список
+      if (trimmed.startsWith('• ') && trimmed.length > 2) {
+        spans.add(
+          TextSpan(
+            text: '• ${trimmed.substring(2)}\n',
+            style: const TextStyle(fontSize: 16),
+          ),
+        );
+        continue;
+      }
+
+      // Жирный текст
+      final boldRegex = RegExp(r'\*\*([^*]+)\*\*');
+      var remaining = line;
+      var boldProcessed = <TextSpan>[];
+
+      int lastEnd = 0;
+      for (final match in boldRegex.allMatches(line)) {
+        if (match.start > lastEnd) {
+          boldProcessed.add(
+            TextSpan(text: line.substring(lastEnd, match.start)),
+          );
+        }
+        boldProcessed.add(
+          TextSpan(
+            text: match.group(1),
+            style: const TextStyle(fontWeight: FontWeight.bold),
+          ),
+        );
+        lastEnd = match.end;
+      }
+      if (lastEnd < line.length) {
+        boldProcessed.add(TextSpan(text: line.substring(lastEnd)));
+      }
+
+      boldProcessed.add(const TextSpan(text: '\n'));
+      spans.addAll(boldProcessed);
+    }
+
+    return spans;
+  }
+}