iOS - floating cursor

lib/src/widgets/box.dart

@@ -119,4 +119,8 @@ abstract class RenderEditableBox extends RenderBox {
   /// Returns the [Rect] in local coordinates for the caret at the given text
   /// position.
   Rect getLocalRectForCaret(TextPosition position);
+
+  /// Returns the [Rect] of the caret prototype at the given text
+  /// position. [Rect] starts at origin.
+  Rect getCaretPrototype(TextPosition position);
 }

lib/src/widgets/cursor.dart

@@ -131,6 +131,17 @@ class CursorCont extends ChangeNotifier {
   Timer? _cursorTimer;
   bool _targetCursorVisibility = false;
 
+  final ValueNotifier<TextPosition?> _floatingCursorTextPosition =
+      ValueNotifier(null);
+
+  ValueNotifier<TextPosition?> get floatingCursorTextPosition =>
+      _floatingCursorTextPosition;
+
+  void setFloatingCursorTextPosition(TextPosition? position) =>
+      _floatingCursorTextPosition.value = position;
+
+  bool get isFloatingCursorActive => floatingCursorTextPosition.value != null;
+
   CursorStyle _style;
   CursorStyle get style => _style;
   set style(CursorStyle value) {

lib/src/widgets/editor.dart

@@ -7,6 +7,7 @@ import 'package:flutter/foundation.dart';
 import 'package:flutter/gestures.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/rendering.dart';
+import 'package:flutter/services.dart';
 import 'package:string_validator/string_validator.dart';
 import 'package:url_launcher/url_launcher.dart';
 
@@ -22,6 +23,7 @@ import 'controller.dart';
 import 'cursor.dart';
 import 'default_styles.dart';
 import 'delegate.dart';
+import 'float_cursor.dart';
 import 'image.dart';
 import 'raw_editor.dart';
 import 'text_selection.dart';
@@ -56,6 +58,10 @@ abstract class EditorState extends State<RawEditor> {
 
   EditorTextSelectionOverlay? getSelectionOverlay();
 
+  /// Controls the floating cursor animation when it is released.
+  /// The floating cursor is animated to merge with the regular cursor.
+  AnimationController get floatingCursorResetController;
+
   bool showToolbar();
 
   void hideToolbar();
@@ -88,9 +94,24 @@ abstract class RenderAbstractEditor {
   /// selection that contains some text but whose ends meet in the middle).
   TextPosition getPositionForOffset(Offset offset);
 
+  /// Returns the local coordinates of the endpoints of the given selection.
+  ///
+  /// If the selection is collapsed (and therefore occupies a single point), the
+  /// returned list is of length one. Otherwise, the selection is not collapsed
+  /// and the returned list is of length two. In this case, however, the two
+  /// points might actually be co-located (e.g., because of a bidirectional
+  /// selection that contains some text but whose ends meet in the middle).
   List<TextSelectionPoint> getEndpointsForSelection(
       TextSelection textSelection);
 
+  /// Sets the screen position of the floating cursor and the text position
+  /// closest to the cursor.
+  /// `resetLerpValue` drives the size of the floating cursor.
+  /// See [EditorState.floatingCursorResetController].
+  void setFloatingCursor(FloatingCursorDragState dragState,
+      Offset lastBoundedOffset, TextPosition lastTextPosition,
+      {double? resetLerpValue});
+
   /// If [ignorePointer] is false (the default) then this method is called by
   /// the internal gesture recognizer's [TapGestureRecognizer.onTapDown]
   /// callback.
@@ -646,25 +667,39 @@ class _QuillEditorSelectionGestureDetectorBuilder
   }
 }
 
+/// Signature for the callback that reports when the user changes the selection
+/// (including the cursor location).
+///
+/// Used by [RenderEditor.onSelectionChanged].
 typedef TextSelectionChangedHandler = void Function(
     TextSelection selection, SelectionChangedCause cause);
 
+// The padding applied to text field. Used to determine the bounds when
+// moving the floating cursor.
+const EdgeInsets _kFloatingCursorAddedMargin = EdgeInsets.fromLTRB(4, 4, 4, 5);
+
+// The additional size on the x and y axis with which to expand the prototype
+// cursor to render the floating cursor in pixels.
+const EdgeInsets _kFloatingCaretSizeIncrease =
+    EdgeInsets.symmetric(horizontal: 0.5, vertical: 1);
+
 class RenderEditor extends RenderEditableContainerBox
     implements RenderAbstractEditor {
   RenderEditor(
-    ViewportOffset? offset,
-    List<RenderEditableBox>? children,
-    TextDirection textDirection,
-    double scrollBottomInset,
-    EdgeInsetsGeometry padding,
-    this.document,
-    this.selection,
-    this._hasFocus,
-    this.onSelectionChanged,
-    this._startHandleLayerLink,
-    this._endHandleLayerLink,
-    EdgeInsets floatingCursorAddedMargin,
-  ) : super(
+      ViewportOffset? offset,
+      List<RenderEditableBox>? children,
+      TextDirection textDirection,
+      double scrollBottomInset,
+      EdgeInsetsGeometry padding,
+      this.document,
+      this.selection,
+      this._hasFocus,
+      this.onSelectionChanged,
+      this._startHandleLayerLink,
+      this._endHandleLayerLink,
+      EdgeInsets floatingCursorAddedMargin,
+      this._cursorController)
+      : super(
           children,
           document.root,
           textDirection,
@@ -672,6 +707,8 @@ class RenderEditor extends RenderEditableContainerBox
           padding,
         );
 
+  final CursorCont _cursorController;
+
   Document document;
   TextSelection selection;
   bool _hasFocus = false;
@@ -983,9 +1020,20 @@ class RenderEditor extends RenderEditableContainerBox
 
   @override
   void paint(PaintingContext context, Offset offset) {
+    if (_hasFocus &&
+        _cursorController.show.value &&
+        !_cursorController.style.paintAboveText) {
+      _paintFloatingCursor(context, offset);
+    }
     defaultPaint(context, offset);
     _updateSelectionExtentsVisibility(offset + _paintOffset);
     _paintHandleLayers(context, getEndpointsForSelection(selection));
+
+    if (_hasFocus &&
+        _cursorController.show.value &&
+        _cursorController.style.paintAboveText) {
+      _paintFloatingCursor(context, offset);
+    }
   }
 
   @override
@@ -1097,6 +1145,128 @@ class RenderEditor extends RenderEditableContainerBox
     final boxParentData = targetChild.parentData as BoxParentData;
     return childLocalRect.shift(Offset(0, boxParentData.offset.dy));
   }
+
+  // Start floating cursor
+
+  FloatingCursorPainter get _floatingCursorPainter => FloatingCursorPainter(
+        floatingCursorRect: _floatingCursorRect,
+        style: _cursorController.style,
+      );
+
+  bool _floatingCursorOn = false;
+  Rect? _floatingCursorRect;
+
+  TextPosition get floatingCursorTextPosition => _floatingCursorTextPosition;
+  late TextPosition _floatingCursorTextPosition;
+
+  // The relative origin in relation to the distance the user has theoretically
+  // dragged the floating cursor offscreen.
+  // This value is used to account for the difference
+  // in the rendering position and the raw offset value.
+  Offset _relativeOrigin = Offset.zero;
+  Offset? _previousOffset;
+  bool _resetOriginOnLeft = false;
+  bool _resetOriginOnRight = false;
+  bool _resetOriginOnTop = false;
+  bool _resetOriginOnBottom = false;
+
+  /// Returns the position within the editor closest to the raw cursor offset.
+  Offset calculateBoundedFloatingCursorOffset(
+      Offset rawCursorOffset, double preferredLineHeight) {
+    var deltaPosition = Offset.zero;
+    final topBound = _kFloatingCursorAddedMargin.top;
+    final bottomBound =
+        size.height - preferredLineHeight + _kFloatingCursorAddedMargin.bottom;
+    final leftBound = _kFloatingCursorAddedMargin.left;
+    final rightBound = size.width - _kFloatingCursorAddedMargin.right;
+
+    if (_previousOffset != null) {
+      deltaPosition = rawCursorOffset - _previousOffset!;
+    }
+
+    // If the raw cursor offset has gone off an edge,
+    // we want to reset the relative origin of
+    // the dragging when the user drags back into the field.
+    if (_resetOriginOnLeft && deltaPosition.dx > 0) {
+      _relativeOrigin =
+          Offset(rawCursorOffset.dx - leftBound, _relativeOrigin.dy);
+      _resetOriginOnLeft = false;
+    } else if (_resetOriginOnRight && deltaPosition.dx < 0) {
+      _relativeOrigin =
+          Offset(rawCursorOffset.dx - rightBound, _relativeOrigin.dy);
+      _resetOriginOnRight = false;
+    }
+    if (_resetOriginOnTop && deltaPosition.dy > 0) {
+      _relativeOrigin =
+          Offset(_relativeOrigin.dx, rawCursorOffset.dy - topBound);
+      _resetOriginOnTop = false;
+    } else if (_resetOriginOnBottom && deltaPosition.dy < 0) {
+      _relativeOrigin =
+          Offset(_relativeOrigin.dx, rawCursorOffset.dy - bottomBound);
+      _resetOriginOnBottom = false;
+    }
+
+    final currentX = rawCursorOffset.dx - _relativeOrigin.dx;
+    final currentY = rawCursorOffset.dy - _relativeOrigin.dy;
+    final double adjustedX =
+        math.min(math.max(currentX, leftBound), rightBound);
+    final double adjustedY =
+        math.min(math.max(currentY, topBound), bottomBound);
+    final adjustedOffset = Offset(adjustedX, adjustedY);
+
+    if (currentX < leftBound && deltaPosition.dx < 0) {
+      _resetOriginOnLeft = true;
+    } else if (currentX > rightBound && deltaPosition.dx > 0) {
+      _resetOriginOnRight = true;
+    }
+    if (currentY < topBound && deltaPosition.dy < 0) {
+      _resetOriginOnTop = true;
+    } else if (currentY > bottomBound && deltaPosition.dy > 0) {
+      _resetOriginOnBottom = true;
+    }
+
+    _previousOffset = rawCursorOffset;
+
+    return adjustedOffset;
+  }
+
+  @override
+  void setFloatingCursor(FloatingCursorDragState dragState,
+      Offset boundedOffset, TextPosition textPosition,
+      {double? resetLerpValue}) {
+    if (dragState == FloatingCursorDragState.Start) {
+      _relativeOrigin = Offset.zero;
+      _previousOffset = null;
+      _resetOriginOnBottom = false;
+      _resetOriginOnTop = false;
+      _resetOriginOnRight = false;
+      _resetOriginOnBottom = false;
+    }
+    _floatingCursorOn = dragState != FloatingCursorDragState.End;
+    if (_floatingCursorOn) {
+      _floatingCursorTextPosition = textPosition;
+      final sizeAdjustment = resetLerpValue != null
+          ? EdgeInsets.lerp(
+              _kFloatingCaretSizeIncrease, EdgeInsets.zero, resetLerpValue)!
+          : _kFloatingCaretSizeIncrease;
+      final child = childAtPosition(textPosition);
+      final caretPrototype =
+          child.getCaretPrototype(child.globalToLocalPosition(textPosition));
+      _floatingCursorRect =
+          sizeAdjustment.inflateRect(caretPrototype).shift(boundedOffset);
+      _cursorController
+          .setFloatingCursorTextPosition(_floatingCursorTextPosition);
+    } else {
+      _floatingCursorRect = null;
+      _cursorController.setFloatingCursorTextPosition(null);
+    }
+  }
+
+  void _paintFloatingCursor(PaintingContext context, Offset offset) {
+    _floatingCursorPainter.paint(context.canvas);
+  }
+
+// End floating cursor
 }
 
 class EditableContainerParentData

lib/src/widgets/float_cursor.dart

@@ -0,0 +1,31 @@
+// The corner radius of the floating cursor in pixels.
+import 'dart:ui';
+
+import '../../widgets/cursor.dart';
+
+const Radius _kFloatingCaretRadius = Radius.circular(1);
+
+/// Floating painter responsible for painting the floating cursor when
+/// floating mode is activated
+class FloatingCursorPainter {
+  FloatingCursorPainter({
+    required this.floatingCursorRect,
+    required this.style,
+  });
+
+  CursorStyle style;
+
+  Rect? floatingCursorRect;
+
+  final Paint floatingCursorPaint = Paint();
+
+  void paint(Canvas canvas) {
+    final floatingCursorRect = this.floatingCursorRect;
+    final floatingCursorColor = style.color.withOpacity(0.75);
+    if (floatingCursorRect == null) return;
+    canvas.drawRRect(
+      RRect.fromRectAndRadius(floatingCursorRect, _kFloatingCaretRadius),
+      floatingCursorPaint..color = floatingCursorColor,
+    );
+  }
+}

lib/src/widgets/raw_editor.dart

@@ -126,6 +126,7 @@ class RawEditorState extends EditorState
   ScrollController get scrollController => _scrollController;
   late ScrollController _scrollController;
 
+  // Cursors
   late CursorCont _cursorCont;
 
   // Focus
@@ -133,6 +134,7 @@ class RawEditorState extends EditorState
   FocusAttachment? _focusAttachment;
   bool get _hasFocus => widget.focusNode.hasFocus;
 
+  // Theme
   DefaultStyles? _styles;
 
   final ClipboardStatusNotifier _clipboardStatus = ClipboardStatusNotifier();
@@ -162,6 +164,7 @@ class RawEditorState extends EditorState
           document: _doc,
           selection: widget.controller.selection,
           hasFocus: _hasFocus,
+          cursorController: _cursorCont,
           textDirection: _textDirection,
           startHandleLayerLink: _startHandleLayerLink,
           endHandleLayerLink: _endHandleLayerLink,
@@ -196,6 +199,7 @@ class RawEditorState extends EditorState
               onSelectionChanged: _handleSelectionChanged,
               scrollBottomInset: widget.scrollBottomInset,
               padding: widget.padding,
+              cursorController: _cursorCont,
               children: _buildChildren(_doc, context),
             ),
           ),
@@ -362,6 +366,11 @@ class RawEditorState extends EditorState
       tickerProvider: this,
     );
 
+    // Floating cursor
+    _floatingCursorResetController = AnimationController(vsync: this);
+    _floatingCursorResetController.addListener(onFloatingCursorResetTick);
+
+    // Keyboard
     _keyboardListener = KeyboardEventHandler(
       handleCursorMovement,
       handleShortcut,
@@ -727,6 +736,12 @@ class RawEditorState extends EditorState
 
   @override
   bool get readOnly => widget.readOnly;
+
+  @override
+  AnimationController get floatingCursorResetController =>
+      _floatingCursorResetController;
+
+  late AnimationController _floatingCursorResetController;
 }
 
 class _Editor extends MultiChildRenderObjectWidget {
@@ -741,6 +756,7 @@ class _Editor extends MultiChildRenderObjectWidget {
     required this.endHandleLayerLink,
     required this.onSelectionChanged,
     required this.scrollBottomInset,
+    required this.cursorController,
     this.padding = EdgeInsets.zero,
     this.offset,
   }) : super(key: key, children: children);
@@ -755,23 +771,24 @@ class _Editor extends MultiChildRenderObjectWidget {
   final TextSelectionChangedHandler onSelectionChanged;
   final double scrollBottomInset;
   final EdgeInsetsGeometry padding;
+  final CursorCont cursorController;
 
   @override
   RenderEditor createRenderObject(BuildContext context) {
     return RenderEditor(
-      offset,
-      null,
-      textDirection,
-      scrollBottomInset,
-      padding,
-      document,
-      selection,
-      hasFocus,
-      onSelectionChanged,
-      startHandleLayerLink,
-      endHandleLayerLink,
-      const EdgeInsets.fromLTRB(4, 4, 4, 5),
-    );
+        offset,
+        null,
+        textDirection,
+        scrollBottomInset,
+        padding,
+        document,
+        selection,
+        hasFocus,
+        onSelectionChanged,
+        startHandleLayerLink,
+        endHandleLayerLink,
+        const EdgeInsets.fromLTRB(4, 4, 4, 5),
+        cursorController);
   }
 
   @override

lib/src/widgets/raw_editor/raw_editor_state_text_input_client_mixin.dart

@@ -1,3 +1,6 @@
+import 'dart:ui';
+
+import 'package:flutter/animation.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/services.dart';
 
@@ -185,9 +188,119 @@ mixin RawEditorStateTextInputClientMixin on EditorState
     // no-op
   }
 
+  // The time it takes for the floating cursor to snap to the text aligned
+  // cursor position after the user has finished placing it.
+  static const Duration _floatingCursorResetTime = Duration(milliseconds: 125);
+
+  // The original position of the caret on FloatingCursorDragState.start.
+  Rect? _startCaretRect;
+
+  // The most recent text position as determined by the location of the floating
+  // cursor.
+  TextPosition? _lastTextPosition;
+
+  // The offset of the floating cursor as determined from the start call.
+  Offset? _pointOffsetOrigin;
+
+  // The most recent position of the floating cursor.
+  Offset? _lastBoundedOffset;
+
+  // Because the center of the cursor is preferredLineHeight / 2 below the touch
+  // origin, but the touch origin is used to determine which line the cursor is
+  // on, we need this offset to correctly render and move the cursor.
+  Offset _floatingCursorOffset(TextPosition textPosition) =>
+      Offset(0, getRenderEditor()!.preferredLineHeight(textPosition) / 2);
+
   @override
   void updateFloatingCursor(RawFloatingCursorPoint point) {
-    throw UnimplementedError();
+    switch (point.state) {
+      case FloatingCursorDragState.Start:
+        if (floatingCursorResetController.isAnimating) {
+          floatingCursorResetController.stop();
+          onFloatingCursorResetTick();
+        }
+        // We want to send in points that are centered around a (0,0) origin, so
+        // we cache the position.
+        _pointOffsetOrigin = point.offset;
+
+        final currentTextPosition =
+            TextPosition(offset: getRenderEditor()!.selection.baseOffset);
+        _startCaretRect =
+            getRenderEditor()!.getLocalRectForCaret(currentTextPosition);
+
+        _lastBoundedOffset = _startCaretRect!.center -
+            _floatingCursorOffset(currentTextPosition);
+        _lastTextPosition = currentTextPosition;
+        getRenderEditor()!.setFloatingCursor(
+            point.state, _lastBoundedOffset!, _lastTextPosition!);
+        break;
+      case FloatingCursorDragState.Update:
+        assert(_lastTextPosition != null, 'Last text position was not set');
+        final floatingCursorOffset = _floatingCursorOffset(_lastTextPosition!);
+        final centeredPoint = point.offset! - _pointOffsetOrigin!;
+        final rawCursorOffset =
+            _startCaretRect!.center + centeredPoint - floatingCursorOffset;
+
+        final preferredLineHeight =
+            getRenderEditor()!.preferredLineHeight(_lastTextPosition!);
+        _lastBoundedOffset =
+            getRenderEditor()!.calculateBoundedFloatingCursorOffset(
+          rawCursorOffset,
+          preferredLineHeight,
+        );
+        _lastTextPosition = getRenderEditor()!.getPositionForOffset(
+            getRenderEditor()!
+                .localToGlobal(_lastBoundedOffset! + floatingCursorOffset));
+        getRenderEditor()!.setFloatingCursor(
+            point.state, _lastBoundedOffset!, _lastTextPosition!);
+        final newSelection = TextSelection.collapsed(
+            offset: _lastTextPosition!.offset,
+            affinity: _lastTextPosition!.affinity);
+        // Setting selection as floating cursor moves will have scroll view
+        // bring background cursor into view
+        getRenderEditor()!
+            .onSelectionChanged(newSelection, SelectionChangedCause.forcePress);
+        break;
+      case FloatingCursorDragState.End:
+        // We skip animation if no update has happened.
+        if (_lastTextPosition != null && _lastBoundedOffset != null) {
+          floatingCursorResetController
+            ..value = 0.0
+            ..animateTo(1,
+                duration: _floatingCursorResetTime, curve: Curves.decelerate);
+        }
+        break;
+    }
+  }
+
+  /// Specifies the floating cursor dimensions and position based
+  /// the animation controller value.
+  /// The floating cursor is resized
+  /// (see [RenderAbstractEditor.setFloatingCursor])
+  /// and repositioned (linear interpolation between position of floating cursor
+  /// and current position of background cursor)
+  void onFloatingCursorResetTick() {
+    final finalPosition =
+        getRenderEditor()!.getLocalRectForCaret(_lastTextPosition!).centerLeft -
+            _floatingCursorOffset(_lastTextPosition!);
+    if (floatingCursorResetController.isCompleted) {
+      getRenderEditor()!.setFloatingCursor(
+          FloatingCursorDragState.End, finalPosition, _lastTextPosition!);
+      _startCaretRect = null;
+      _lastTextPosition = null;
+      _pointOffsetOrigin = null;
+      _lastBoundedOffset = null;
+    } else {
+      final lerpValue = floatingCursorResetController.value;
+      final lerpX =
+          lerpDouble(_lastBoundedOffset!.dx, finalPosition.dx, lerpValue)!;
+      final lerpY =
+          lerpDouble(_lastBoundedOffset!.dy, finalPosition.dy, lerpValue)!;
+
+      getRenderEditor()!.setFloatingCursor(FloatingCursorDragState.Update,
+          Offset(lerpX, lerpY), _lastTextPosition!,
+          resetLerpValue: lerpValue);
+    }
   }
 
   @override

lib/src/widgets/simple_viewer.dart

@@ -150,15 +150,15 @@ class _QuillSimpleViewerState extends State<QuillSimpleViewer>
       link: _toolbarLayerLink,
       child: Semantics(
         child: _SimpleViewer(
-          document: _doc,
-          textDirection: _textDirection,
-          startHandleLayerLink: _startHandleLayerLink,
-          endHandleLayerLink: _endHandleLayerLink,
-          onSelectionChanged: _nullSelectionChanged,
-          scrollBottomInset: widget.scrollBottomInset,
-          padding: widget.padding,
-          children: _buildChildren(_doc, context),
-        ),
+            document: _doc,
+            textDirection: _textDirection,
+            startHandleLayerLink: _startHandleLayerLink,
+            endHandleLayerLink: _endHandleLayerLink,
+            onSelectionChanged: _nullSelectionChanged,
+            scrollBottomInset: widget.scrollBottomInset,
+            padding: widget.padding,
+            cursorController: _cursorCont,
+            children: _buildChildren(_doc, context)),
       ),
     );
 
@@ -315,6 +315,7 @@ class _SimpleViewer extends MultiChildRenderObjectWidget {
     required this.endHandleLayerLink,
     required this.onSelectionChanged,
     required this.scrollBottomInset,
+    required this.cursorController,
     this.offset,
     this.padding = EdgeInsets.zero,
     Key? key,
@@ -328,24 +329,25 @@ class _SimpleViewer extends MultiChildRenderObjectWidget {
   final TextSelectionChangedHandler onSelectionChanged;
   final double scrollBottomInset;
   final EdgeInsetsGeometry padding;
+  final CursorCont cursorController;
 
   @override
   RenderEditor createRenderObject(BuildContext context) {
     return RenderEditor(
-      offset,
-      null,
-      textDirection,
-      scrollBottomInset,
-      padding,
-      document,
-      const TextSelection(baseOffset: 0, extentOffset: 0),
-      false,
-      // hasFocus,
-      onSelectionChanged,
-      startHandleLayerLink,
-      endHandleLayerLink,
-      const EdgeInsets.fromLTRB(4, 4, 4, 5),
-    );
+        offset,
+        null,
+        textDirection,
+        scrollBottomInset,
+        padding,
+        document,
+        const TextSelection(baseOffset: 0, extentOffset: 0),
+        false,
+        // hasFocus,
+        onSelectionChanged,
+        startHandleLayerLink,
+        endHandleLayerLink,
+        const EdgeInsets.fromLTRB(4, 4, 4, 5),
+        cursorController);
   }
 
   @override

lib/src/widgets/text_block.dart

@@ -560,6 +560,16 @@ class RenderEditableTextBlock extends RenderEditableContainerBox
       affinity: position.affinity,
     );
   }
+
+  @override
+  Rect getCaretPrototype(TextPosition position) {
+    final child = childAtPosition(position);
+    final localPosition = TextPosition(
+      offset: position.offset - child.getContainer().offset,
+      affinity: position.affinity,
+    );
+    return child.getCaretPrototype(localPosition);
+  }
 }
 
 class _EditableBlock extends MultiChildRenderObjectWidget {

lib/src/widgets/text_line.dart

@@ -387,7 +387,7 @@ class RenderEditableTextLine extends RenderEditableBox {
   EdgeInsets? _resolvedPadding;
   bool? _containsCursor;
   List<TextBox>? _selectedRects;
-  Rect? _caretPrototype;
+  late Rect _caretPrototype;
   final Map<TextLineSlot, RenderBox> children = <TextLineSlot, RenderBox>{};
 
   Iterable<RenderBox> get _children sync* {
@@ -501,8 +501,11 @@ class RenderEditableTextLine extends RenderEditableBox {
   }
 
   bool containsCursor() {
-    return _containsCursor ??= textSelection.isCollapsed &&
-        line.containsOffset(textSelection.baseOffset);
+    return _containsCursor ??= cursorCont.isFloatingCursorActive
+        ? line
+            .containsOffset(cursorCont.floatingCursorTextPosition.value!.offset)
+        : textSelection.isCollapsed &&
+            line.containsOffset(textSelection.baseOffset);
   }
 
   RenderBox? _updateChild(
@@ -638,6 +641,17 @@ class RenderEditableTextLine extends RenderEditableBox {
       cursorCont.style.height ??
       preferredLineHeight(const TextPosition(offset: 0));
 
+  // TODO: This is no longer producing the highest-fidelity caret
+  // heights for Android, especially when non-alphabetic languages
+  // are involved. The current implementation overrides the height set
+  // here with the full measured height of the text on Android which looks
+  // superior (subjectively and in terms of fidelity) in _paintCaret. We
+  // should rework this properly to once again match the platform. The constant
+  // _kCaretHeightOffset scales poorly for small font sizes.
+  //
+  /// On iOS, the cursor is taller than the cursor on Android. The height
+  /// of the cursor for iOS is approximate and obtained through an eyeball
+  /// comparison.
   void _computeCaretPrototype() {
     switch (defaultTargetPlatform) {
       case TargetPlatform.iOS:
@@ -655,12 +669,24 @@ class RenderEditableTextLine extends RenderEditableBox {
     }
   }
 
+  void _onFloatingCursorChange() {
+    _containsCursor = null;
+    markNeedsPaint();
+  }
+
+  // End caret implementation
+
+  //
+
+  // Start render box overrides
+
   @override
   void attach(covariant PipelineOwner owner) {
     super.attach(owner);
     for (final child in _children) {
       child.attach(owner);
     }
+    cursorCont.floatingCursorTextPosition.addListener(_onFloatingCursorChange);
     if (containsCursor()) {
       cursorCont.addListener(markNeedsLayout);
       cursorCont.color.addListener(safeMarkNeedsPaint);
@@ -673,6 +699,8 @@ class RenderEditableTextLine extends RenderEditableBox {
     for (final child in _children) {
       child.detach();
     }
+    cursorCont.floatingCursorTextPosition
+        .removeListener(_onFloatingCursorChange);
     if (containsCursor()) {
       cursorCont.removeListener(markNeedsLayout);
       cursorCont.color.removeListener(safeMarkNeedsPaint);
@@ -817,8 +845,10 @@ class RenderEditableTextLine extends RenderEditableBox {
   CursorPainter get _cursorPainter => CursorPainter(
         editable: _body,
         style: cursorCont.style,
-        prototype: _caretPrototype!,
-        color: cursorCont.color.value,
+        prototype: _caretPrototype,
+        color: cursorCont.isFloatingCursorActive
+            ? cursorCont.style.backgroundColor
+            : cursorCont.color.value,
         devicePixelRatio: devicePixelRatio,
       );
 
@@ -873,10 +903,14 @@ class RenderEditableTextLine extends RenderEditableBox {
 
   void _paintCursor(
       PaintingContext context, Offset effectiveOffset, bool lineHasEmbed) {
-    final position = TextPosition(
-      offset: textSelection.extentOffset - line.documentOffset,
-      affinity: textSelection.base.affinity,
-    );
+    final position = cursorCont.isFloatingCursorActive
+        ? TextPosition(
+            offset: cursorCont.floatingCursorTextPosition.value!.offset -
+                line.documentOffset,
+            affinity: cursorCont.floatingCursorTextPosition.value!.affinity)
+        : TextPosition(
+            offset: textSelection.extentOffset - line.documentOffset,
+            affinity: textSelection.base.affinity);
     _cursorPainter.paint(
         context.canvas, effectiveOffset, position, lineHasEmbed);
   }
@@ -921,6 +955,9 @@ class RenderEditableTextLine extends RenderEditableBox {
     }
     markNeedsPaint();
   }
+
+  @override
+  Rect getCaretPrototype(TextPosition position) => _caretPrototype;
 }
 
 class _TextLineElement extends RenderObjectElement {