Добавил отображение форматированных сообщений, возможность их форматировать

2025-12-04 21:07:23 +07:00
parent d344adf035
commit c945d57371
7 changed files with 374 additions and 105 deletions
--- a/lib/widgets/formatted_text_controller.dart
+++ b/lib/widgets/formatted_text_controller.dart
@@ -0,0 +1,79 @@
+import 'package:flutter/material.dart';
+
+class FormattedTextController extends TextEditingController {
+  final List<Map<String, dynamic>> elements = [];
+
+  FormattedTextController({String? text}) : super(text: text);
+
+  @override
+  TextSpan buildTextSpan({
+    required BuildContext context,
+    TextStyle? style,
+    bool withComposing = false,
+  }) {
+    final baseStyle = style ?? DefaultTextStyle.of(context).style;
+    final text = value.text;
+
+    if (text.isEmpty || elements.isEmpty) {
+      return TextSpan(text: text, style: baseStyle);
+    }
+
+    final bold = List<bool>.filled(text.length, false);
+    final italic = List<bool>.filled(text.length, false);
+    final underline = List<bool>.filled(text.length, false);
+    final strike = List<bool>.filled(text.length, false);
+
+    for (final el in elements) {
+      final type = el['type'] as String?;
+      final from = (el['from'] as int?) ?? 0;
+      final length = (el['length'] as int?) ?? 0;
+      if (type == null || length <= 0) continue;
+      final start = from.clamp(0, text.length);
+      final end = (from + length).clamp(0, text.length);
+      for (int i = start; i < end; i++) {
+        switch (type) {
+          case 'STRONG':
+            bold[i] = true;
+            break;
+          case 'EMPHASIZED':
+            italic[i] = true;
+            break;
+          case 'UNDERLINE':
+            underline[i] = true;
+            break;
+          case 'STRIKETHROUGH':
+            strike[i] = true;
+            break;
+        }
+      }
+    }
+
+    final spans = <InlineSpan>[];
+    int start = 0;
+
+    TextStyle styleForIndex(int i) {
+      var s = baseStyle;
+      if (bold[i]) s = s.copyWith(fontWeight: FontWeight.w600);
+      if (italic[i]) s = s.copyWith(fontStyle: FontStyle.italic);
+      final decos = <TextDecoration>[];
+      if (underline[i]) decos.add(TextDecoration.underline);
+      if (strike[i]) decos.add(TextDecoration.lineThrough);
+      if (decos.isNotEmpty) {
+        s = s.copyWith(decoration: TextDecoration.combine(decos));
+      }
+      return s;
+    }
+
+    while (start < text.length) {
+      int end = start + 1;
+      final base = styleForIndex(start);
+      while (end < text.length && styleForIndex(end) == base) {
+        end++;
+      }
+      spans.add(TextSpan(text: text.substring(start, end), style: base));
+      start = end;
+    }
+
+    return TextSpan(style: baseStyle, children: spans);
+  }
+}