Merge pull request #59 from solid-software/bug/set-cursor-with-scroll

Bug/Unable to set the cursor with text scrolling

Author: solid-danylokhvan

lib/core/controllers/colored_text_editing_controller.dart

@@ -36,6 +36,9 @@ class ColoredTextEditingController extends TextEditingController {
   /// Reference to the focus of the LanguageTool TextField
   FocusNode? focusNode;
 
+  /// Represents the scroll offset value of the LanguageTool TextField.
+  double? scrollOffset;
+
   Object? _fetchError;
 
   /// An error that may have occurred during the API fetch.
@@ -367,10 +370,17 @@ class ColoredTextEditingController extends TextEditingController {
       textDirection: TextDirection.ltr,
     );
     final textFieldWidth = textFieldRenderBox?.size.width ?? 0;
+    final scrollOffset = this.scrollOffset ?? 0;
+
+    double maxWidth = double.infinity;
+    if (scrollOffset == 0) maxWidth = textFieldWidth;
+
+    textPainter.layout(minWidth: textFieldWidth, maxWidth: maxWidth);
 
-    textPainter.layout(maxWidth: textFieldWidth);
+    final adjustedOffset =
+        Offset(localOffset.dx + scrollOffset, localOffset.dy);
 
-    return textPainter.getPositionForOffset(localOffset).offset;
+    return textPainter.getPositionForOffset(adjustedOffset).offset;
   }
 
   /// The `onClosePopup` function is a callback method typically used

lib/presentation/language_tool_text_field.dart

@@ -43,13 +43,15 @@ class LanguageToolTextField extends StatefulWidget {
 }
 
 class _LanguageToolTextFieldState extends State<LanguageToolTextField> {
-  final focusNode = FocusNode();
+  final _focusNode = FocusNode();
+  final _scrollController = ScrollController();
 
   @override
   void initState() {
     super.initState();
-    widget.coloredController.focusNode = focusNode;
+    widget.coloredController.focusNode = _focusNode;
     widget.coloredController.popupWidget = widget.mistakePopup;
+    widget.coloredController.addListener(_textControllerListener);
   }
 
   @override
@@ -79,7 +81,8 @@ class _LanguageToolTextFieldState extends State<LanguageToolTextField> {
           padding: const EdgeInsets.all(_padding),
           child: Center(
             child: TextField(
-              focusNode: focusNode,
+              scrollController: _scrollController,
+              focusNode: _focusNode,
               controller: widget.coloredController,
               style: widget.style,
               decoration: inputDecoration,
@@ -92,4 +95,14 @@ class _LanguageToolTextFieldState extends State<LanguageToolTextField> {
       },
     );
   }
+
+  void _textControllerListener() =>
+      widget.coloredController.scrollOffset = _scrollController.offset;
+
+  @override
+  void dispose() {
+    _focusNode.dispose();
+    _scrollController.dispose();
+    super.dispose();
+  }
 }