Implement class RenderEditableTextLine

lib/models/documents/nodes/leaf.dart

@@ -201,7 +201,6 @@ class Embed extends Leaf {
 
   @override
   Node newInstance() {
-    // TODO: implement newInstance
     throw UnimplementedError();
   }
 

lib/widgets/editor.dart

@@ -2,12 +2,17 @@ import 'dart:math' as math;
 
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/foundation.dart';
+import 'package:flutter/gestures.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/rendering.dart';
+import 'package:flutter/scheduler.dart';
 import 'package:flutter/services.dart';
+import 'package:flutter_quill/models/documents/attribute.dart';
 import 'package:flutter_quill/models/documents/document.dart';
 import 'package:flutter_quill/models/documents/nodes/container.dart'
     as containerNode;
+import 'package:flutter_quill/models/documents/nodes/leaf.dart';
+import 'package:flutter_quill/models/documents/nodes/line.dart';
 import 'package:flutter_quill/models/documents/nodes/node.dart';
 import 'package:flutter_quill/utils/diff_delta.dart';
 import 'package:flutter_quill/widgets/default_styles.dart';
@@ -224,6 +229,10 @@ class _QuillEditorState extends State<QuillEditor>
   bool getSelectionEnabled() {
     return widget.enableInteractiveSelection;
   }
+
+  _requestKeyboard() {
+    _editorKey.currentState.requestKeyboard();
+  }
 }
 
 class _QuillEditorSelectionGestureDetectorBuilder
@@ -235,6 +244,124 @@ class _QuillEditorSelectionGestureDetectorBuilder
   @override
   onForcePressStart(ForcePressDetails details) {
     super.onForcePressStart(details);
+    if (delegate.getSelectionEnabled() && shouldShowSelectionToolbar) {
+      getEditor().showToolbar();
+    }
+  }
+
+  @override
+  onForcePressEnd(ForcePressDetails details) {}
+
+  @override
+  void onSingleLongTapMoveUpdate(LongPressMoveUpdateDetails details) {
+    if (!delegate.getSelectionEnabled()) {
+      return;
+    }
+    switch (Theme.of(_state.context).platform) {
+      case TargetPlatform.iOS:
+      case TargetPlatform.macOS:
+        getRenderEditor().selectPositionAt(
+          details.globalPosition,
+          null,
+          SelectionChangedCause.longPress,
+        );
+        break;
+      case TargetPlatform.android:
+      case TargetPlatform.fuchsia:
+      case TargetPlatform.linux:
+      case TargetPlatform.windows:
+        getRenderEditor().selectWordsInRange(
+          details.globalPosition - details.offsetFromOrigin,
+          details.globalPosition,
+          SelectionChangedCause.longPress,
+        );
+        break;
+      default:
+        throw ('Invalid platform');
+    }
+  }
+
+  _launchUrlIfNeeded(TapUpDetails details) {
+    TextPosition pos =
+        getRenderEditor().getPositionForOffset(details.globalPosition);
+    containerNode.ChildQuery result =
+        getEditor().widget.controller.document.queryChild(pos.offset);
+    if (result.node == null) {
+      return;
+    }
+    Line line = result.node as Line;
+    containerNode.ChildQuery segmentResult =
+        line.queryChild(result.offset, false);
+    if (segmentResult.node == null) {
+      return;
+    }
+    Leaf segment = segmentResult.node as Leaf;
+    if (segment.style.containsKey(Attribute.link.key) &&
+        getEditor().widget.onLaunchUrl != null) {
+      if (getEditor().widget.readOnly) {
+        getEditor()
+            .widget
+            .onLaunchUrl(segment.style.attributes[Attribute.link.key].value);
+      }
+    }
+  }
+
+  @override
+  onSingleTapUp(TapUpDetails details) {
+    getEditor().hideToolbar();
+
+    _launchUrlIfNeeded(details);
+
+    if (delegate.getSelectionEnabled()) {
+      switch (Theme.of(_state.context).platform) {
+        case TargetPlatform.iOS:
+        case TargetPlatform.macOS:
+          switch (details.kind) {
+            case PointerDeviceKind.mouse:
+            case PointerDeviceKind.stylus:
+            case PointerDeviceKind.invertedStylus:
+              getRenderEditor().selectPosition(SelectionChangedCause.tap);
+              break;
+            case PointerDeviceKind.touch:
+            case PointerDeviceKind.unknown:
+              getRenderEditor().selectWordEdge(SelectionChangedCause.tap);
+              break;
+          }
+          break;
+        case TargetPlatform.android:
+        case TargetPlatform.fuchsia:
+        case TargetPlatform.linux:
+        case TargetPlatform.windows:
+          getRenderEditor().selectPosition(SelectionChangedCause.tap);
+          break;
+      }
+    }
+    _state._requestKeyboard();
+  }
+
+  @override
+  void onSingleLongTapStart(LongPressStartDetails details) {
+    if (delegate.getSelectionEnabled()) {
+      switch (Theme.of(_state.context).platform) {
+        case TargetPlatform.iOS:
+        case TargetPlatform.macOS:
+          getRenderEditor().selectPositionAt(
+            details.globalPosition,
+            null,
+            SelectionChangedCause.longPress,
+          );
+          break;
+        case TargetPlatform.android:
+        case TargetPlatform.fuchsia:
+        case TargetPlatform.linux:
+        case TargetPlatform.windows:
+          getRenderEditor().selectWord(SelectionChangedCause.longPress);
+          Feedback.forLongPress(_state.context);
+          break;
+        default:
+          throw ('Invalid platform');
+      }
+    }
   }
 }
 
@@ -329,6 +456,9 @@ class RawEditorState extends EditorState
   bool _didAutoFocus = false;
   DefaultStyles _styles;
   final ClipboardStatusNotifier _clipboardStatus = ClipboardStatusNotifier();
+  final LayerLink _toolbarLayerLink = LayerLink();
+  final LayerLink _startHandleLayerLink = LayerLink();
+  final LayerLink _endHandleLayerLink = LayerLink();
 
   bool get _hasFocus => widget.focusNode.hasFocus;
 
@@ -702,6 +832,7 @@ class RawEditorState extends EditorState
     _focusAttachment.reparent();
     super.build(context);
 
+    // TODO
     throw UnimplementedError();
   }
 
@@ -856,7 +987,7 @@ class RawEditorState extends EditorState
 
         textEditingValue = TextEditingValue(
           text:
-          selection.textBefore(plainText) + selection.textAfter(plainText),
+              selection.textBefore(plainText) + selection.textAfter(plainText),
           selection: TextSelection.collapsed(offset: selection.start),
         );
       }
@@ -906,18 +1037,102 @@ class RawEditorState extends EditorState
   }
 
   _didChangeTextEditingValue() {
-    // TODO
+    requestKeyboard();
+
+    _showCaretOnScreen();
+    updateRemoteValueIfNeeded();
+    _cursorCont.startOrStopCursorTimerIfNeeded(
+        _hasFocus, widget.controller.selection);
+    if (hasConnection) {
+      _cursorCont.stopCursorTimer(resetCharTicks: false);
+      _cursorCont.startCursorTimer();
+    }
+
+    SchedulerBinding.instance.addPostFrameCallback(
+        (Duration _) => _updateOrDisposeSelectionOverlayIfNeeded());
   }
 
-  _handleFocusChanged() {
+  _updateOrDisposeSelectionOverlayIfNeeded() {
-    // TODO
+    if (_selectionOverlay != null) {
+      if (_hasFocus) {
+        _selectionOverlay.update(textEditingValue);
+      } else {
+        _selectionOverlay.dispose();
+        _selectionOverlay = null;
+      }
+    } else if (_hasFocus) {
+      _selectionOverlay?.hide();
+      _selectionOverlay = null;
+
+      if (widget.selectionCtrls != null) {
+        _selectionOverlay = EditorTextSelectionOverlay(
+            textEditingValue,
+            false,
+            context,
+            widget,
+            _toolbarLayerLink,
+            _startHandleLayerLink,
+            _endHandleLayerLink,
+            getRenderEditor(),
+            widget.selectionCtrls,
+            this,
+            DragStartBehavior.start,
+            null,
+            _clipboardStatus);
+        _selectionOverlay.handlesVisible = _shouldShowSelectionHandles();
+        _selectionOverlay.showHandles();
+      }
+    }
   }
 
-  _onChangedClipboardStatus() {
+  _handleFocusChanged() {
-    // TODO
+    openOrCloseConnection();
+    _cursorCont.startOrStopCursorTimerIfNeeded(
+        _hasFocus, widget.controller.selection);
+    _updateOrDisposeSelectionOverlayIfNeeded();
+    if (_hasFocus) {
+      WidgetsBinding.instance.addObserver(this);
+      _showCaretOnScreen();
+    } else {
+      WidgetsBinding.instance.removeObserver(this);
+    }
+    updateKeepAlive();
   }
 
-  _showCaretOnScreen() {}
+  _onChangedClipboardStatus() {}
+
+  bool _showCaretOnScreenScheduled = false;
+
+  _showCaretOnScreen() {
+    if (!widget.showCursor || _showCaretOnScreenScheduled) {
+      return;
+    }
+
+    _showCaretOnScreenScheduled = true;
+    SchedulerBinding.instance.addPostFrameCallback((Duration _) {
+      _showCaretOnScreenScheduled = false;
+
+      final viewport = RenderAbstractViewport.of(getRenderEditor());
+      assert(viewport != null);
+      final editorOffset =
+          getRenderEditor().localToGlobal(Offset(0.0, 0.0), ancestor: viewport);
+      final offsetInViewport = _scrollController.offset + editorOffset.dy;
+
+      final offset = getRenderEditor().getOffsetToRevealCursor(
+        _scrollController.position.viewportDimension,
+        _scrollController.offset,
+        offsetInViewport,
+      );
+
+      if (offset != null) {
+        _scrollController.animateTo(
+          offset,
+          duration: Duration(milliseconds: 100),
+          curve: Curves.fastOutSlowIn,
+        );
+      }
+    });
+  }
 
   @override
   RenderEditor getRenderEditor() {
@@ -979,6 +1194,14 @@ class RawEditorState extends EditorState
 
   @override
   bool get wantKeepAlive => widget.focusNode.hasFocus;
+
+  openOrCloseConnection() {
+    if (widget.focusNode.hasFocus && widget.focusNode.consumeKeyboardToken()) {
+      openConnectionIfNeeded();
+    } else if (!widget.focusNode.hasFocus) {
+      closeConnectionIfNeeded();
+    }
+  }
 }
 
 typedef TextSelectionChangedHandler = void Function(
@@ -993,7 +1216,7 @@ class RenderEditor extends RenderEditableContainerBox
   LayerLink _endHandleLayerLink;
   TextSelectionChangedHandler onSelectionChanged;
   final ValueNotifier<bool> _selectionStartInViewport =
-  ValueNotifier<bool>(true);
+      ValueNotifier<bool>(true);
 
   ValueListenable<bool> get selectionStartInViewport =>
       _selectionStartInViewport;
@@ -1001,7 +1224,8 @@ class RenderEditor extends RenderEditableContainerBox
   ValueListenable<bool> get selectionEndInViewport => _selectionEndInViewport;
   final ValueNotifier<bool> _selectionEndInViewport = ValueNotifier<bool>(true);
 
-  RenderEditor(List<RenderEditableBox> children,
+  RenderEditor(
+      List<RenderEditableBox> children,
       TextDirection textDirection,
       hasFocus,
       EdgeInsetsGeometry padding,
@@ -1126,6 +1350,34 @@ class RenderEditor extends RenderEditableContainerBox
     assert(cause != null && from != null);
     // TODO: implement selectWordsInRange
   }
+
+  getOffsetToRevealCursor(
+      double viewportHeight, double scrollOffset, double offsetInViewport) {
+    List<TextSelectionPoint> endpoints = getEndpointsForSelection(selection);
+    if (endpoints.length != 1) {
+      return null;
+    }
+    RenderEditableBox child = childAtPosition(selection.extent);
+    const kMargin = 8.0;
+
+    double caretTop = endpoints.single.point.dy -
+        child.preferredLineHeight(TextPosition(
+            offset:
+                selection.extentOffset - child.getContainer().getOffset())) -
+        kMargin +
+        offsetInViewport;
+    final caretBottom = endpoints.single.point.dy + kMargin + offsetInViewport;
+    double dy;
+    if (caretTop < scrollOffset) {
+      dy = caretTop;
+    } else if (caretBottom > scrollOffset + viewportHeight) {
+      dy = caretBottom - viewportHeight;
+    }
+    if (dy == null) {
+      return null;
+    }
+    return math.max(dy, 0.0);
+  }
 }
 
 class EditableContainerParentData

lib/widgets/text_block.dart

@@ -171,6 +171,8 @@ class EditableTextBlock extends StatelessWidget {
       } else if (attrs.containsKey(Attribute.codeBlock.key)) {
         lineSpacing = defaultStyles.code.lineSpacing;
       }
+      top = lineSpacing.item1;
+      bottom = lineSpacing.item2;
     }
 
     if (index == 1) {

lib/widgets/text_line.dart

@@ -1,3 +1,6 @@
+import 'dart:math' as math;
+
+import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/rendering.dart';
 import 'package:flutter_quill/models/documents/attribute.dart';
@@ -10,6 +13,7 @@ import 'package:flutter_quill/models/documents/nodes/node.dart';
 import 'package:flutter_quill/models/documents/style.dart';
 import 'package:flutter_quill/widgets/cursor.dart';
 import 'package:flutter_quill/widgets/proxy.dart';
+import 'package:flutter_quill/widgets/text_selection.dart';
 import 'package:tuple/tuple.dart';
 
 import 'box.dart';
@@ -229,6 +233,15 @@ class RenderEditableTextLine extends RenderEditableBox {
         assert(hasFocus != null),
         assert(cursorCont != null);
 
+  Iterable<RenderBox> get _children sync* {
+    if (leading != null) {
+      yield leading;
+    }
+    if (body != null) {
+      yield body;
+    }
+  }
+
   setCursorCont(CursorCont c) {
     assert(c != null);
     if (cursorCont == c) {
@@ -459,6 +472,248 @@ class RenderEditableTextLine extends RenderEditableBox {
   container.Container getContainer() {
     return line;
   }
+
+  double get cursorWidth => cursorCont.style.width;
+
+  double get cursorHeight =>
+      cursorCont.style.height ?? preferredLineHeight(TextPosition(offset: 0));
+
+  _computeCaretPrototype() {
+    assert(defaultTargetPlatform != null);
+    switch (defaultTargetPlatform) {
+      case TargetPlatform.iOS:
+      case TargetPlatform.macOS:
+        _caretPrototype =
+            Rect.fromLTWH(0.0, 0.0, cursorWidth, cursorHeight + 2);
+        break;
+      case TargetPlatform.android:
+      case TargetPlatform.fuchsia:
+      case TargetPlatform.linux:
+      case TargetPlatform.windows:
+        _caretPrototype =
+            Rect.fromLTWH(0.0, 2.0, cursorWidth, cursorHeight - 4.0);
+        break;
+      default:
+        throw ('Invalid platform');
+    }
+  }
+
+  @override
+  attach(covariant PipelineOwner owner) {
+    super.attach(owner);
+    for (final child in _children) {
+      child.attach(owner);
+    }
+    if (containsCursor()) {
+      cursorCont.addListener(markNeedsLayout);
+      cursorCont.cursorColor.addListener(markNeedsPaint);
+    }
+  }
+
+  @override
+  detach() {
+    super.detach();
+    for (RenderBox child in _children) {
+      child.detach();
+    }
+    if (containsCursor()) {
+      cursorCont.removeListener(markNeedsLayout);
+      cursorCont.cursorColor.removeListener(markNeedsPaint);
+    }
+  }
+
+  @override
+  redepthChildren() {
+    _children.forEach(redepthChild);
+  }
+
+  @override
+  visitChildren(RenderObjectVisitor visitor) {
+    _children.forEach(visitor);
+  }
+
+  @override
+  List<DiagnosticsNode> debugDescribeChildren() {
+    var value = <DiagnosticsNode>[];
+    void add(RenderBox child, String name) {
+      if (child != null) {
+        value.add(child.toDiagnosticsNode(name: name));
+      }
+    }
+
+    add(leading, 'leading');
+    add(body, 'body');
+    return value;
+  }
+
+  @override
+  bool get sizedByParent => false;
+
+  @override
+  double computeMinIntrinsicWidth(double height) {
+    _resolvePadding();
+    double horizontalPadding = _resolvedPadding.left + _resolvedPadding.right;
+    double verticalPadding = _resolvedPadding.top + _resolvedPadding.bottom;
+    int leadingWidth = leading == null
+        ? 0
+        : leading.getMinIntrinsicWidth(height - verticalPadding);
+    int bodyWidth = body == null
+        ? 0
+        : body.getMinIntrinsicWidth(math.max(0.0, height - verticalPadding));
+    return horizontalPadding + leadingWidth + bodyWidth;
+  }
+
+  @override
+  double computeMaxIntrinsicWidth(double height) {
+    _resolvePadding();
+    double horizontalPadding = _resolvedPadding.left + _resolvedPadding.right;
+    double verticalPadding = _resolvedPadding.top + _resolvedPadding.bottom;
+    int leadingWidth = leading == null
+        ? 0
+        : leading.getMaxIntrinsicWidth(height - verticalPadding);
+    int bodyWidth = body == null
+        ? 0
+        : body.getMaxIntrinsicWidth(math.max(0.0, height - verticalPadding));
+    return horizontalPadding + leadingWidth + bodyWidth;
+  }
+
+  @override
+  double computeMinIntrinsicHeight(double width) {
+    _resolvePadding();
+    double horizontalPadding = _resolvedPadding.left + _resolvedPadding.right;
+    double verticalPadding = _resolvedPadding.top + _resolvedPadding.bottom;
+    if (body != null) {
+      return body
+              .getMinIntrinsicHeight(math.max(0.0, width - horizontalPadding)) +
+          verticalPadding;
+    }
+    return verticalPadding;
+  }
+
+  @override
+  double computeMaxIntrinsicHeight(double width) {
+    _resolvePadding();
+    double horizontalPadding = _resolvedPadding.left + _resolvedPadding.right;
+    double verticalPadding = _resolvedPadding.top + _resolvedPadding.bottom;
+    if (body != null) {
+      return body
+              .getMaxIntrinsicHeight(math.max(0.0, width - horizontalPadding)) +
+          verticalPadding;
+    }
+    return verticalPadding;
+  }
+
+  @override
+  double computeDistanceToActualBaseline(TextBaseline baseline) {
+    _resolvePadding();
+    return body.getDistanceToActualBaseline(baseline) + _resolvedPadding.top;
+  }
+
+  @override
+  void performLayout() {
+    final constraints = this.constraints;
+    _selectedRects = null;
+
+    _resolvePadding();
+    assert(_resolvedPadding != null);
+
+    if (body == null && leading == null) {
+      size = constraints.constrain(Size(
+        _resolvedPadding.left + _resolvedPadding.right,
+        _resolvedPadding.top + _resolvedPadding.bottom,
+      ));
+      return;
+    }
+    final innerConstraints = constraints.deflate(_resolvedPadding);
+
+    final indentWidth = textDirection == TextDirection.ltr
+        ? _resolvedPadding.left
+        : _resolvedPadding.right;
+
+    body.layout(innerConstraints, parentUsesSize: true);
+    final bodyParentData = body.parentData as BoxParentData;
+    bodyParentData.offset = Offset(_resolvedPadding.left, _resolvedPadding.top);
+
+    if (leading != null) {
+      final leadingConstraints = innerConstraints.copyWith(
+          minWidth: indentWidth,
+          maxWidth: indentWidth,
+          maxHeight: body.size.height);
+      leading.layout(leadingConstraints, parentUsesSize: true);
+      final parentData = leading.parentData as BoxParentData;
+      parentData.offset = Offset(0.0, _resolvedPadding.top);
+    }
+
+    size = constraints.constrain(Size(
+      _resolvedPadding.left + body.size.width + _resolvedPadding.right,
+      _resolvedPadding.top + body.size.height + _resolvedPadding.bottom,
+    ));
+
+    _computeCaretPrototype();
+  }
+
+  CursorPainter get _cursorPainter => CursorPainter(
+        body,
+        cursorCont.style,
+        _caretPrototype,
+        cursorCont.cursorColor.value,
+        devicePixelRatio,
+      );
+
+  @override
+  paint(PaintingContext context, Offset offset) {
+    if (leading != null) {
+      final parentData = leading.parentData as BoxParentData;
+      final effectiveOffset = offset + parentData.offset;
+      context.paintChild(leading, effectiveOffset);
+    }
+
+    if (body != null) {
+      final parentData = body.parentData as BoxParentData;
+      final effectiveOffset = offset + parentData.offset;
+      if ((enableInteractiveSelection ?? true) &&
+          line.getDocumentOffset() <= textSelection.end &&
+          textSelection.start <= line.getDocumentOffset() + line.length - 1) {
+        final local = localSelection(line, textSelection, false);
+        _selectedRects ??= body.getBoxesForSelection(
+          local,
+        );
+        _paintSelection(context, effectiveOffset);
+      }
+
+      if (hasFocus &&
+          cursorCont.show.value &&
+          containsCursor() &&
+          !cursorCont.style.paintAboveText) {
+        _paintCursor(context, effectiveOffset);
+      }
+
+      context.paintChild(body, effectiveOffset);
+
+      if (hasFocus &&
+          cursorCont.show.value &&
+          containsCursor() &&
+          cursorCont.style.paintAboveText) {
+        _paintCursor(context, effectiveOffset);
+      }
+    }
+  }
+
+  _paintSelection(PaintingContext context, Offset effectiveOffset) {
+    assert(_selectedRects != null);
+    final paint = Paint()..color = color;
+    for (final box in _selectedRects) {
+      context.canvas.drawRect(box.toRect().shift(effectiveOffset), paint);
+    }
+  }
+
+  _paintCursor(PaintingContext context, Offset effectiveOffset) {
+    final position = TextPosition(
+      offset: textSelection.extentOffset - line.getDocumentOffset(),
+      affinity: textSelection.base.affinity,
+    );
+    _cursorPainter.paint(context.canvas, effectiveOffset, position);
+  }
 }
 
 class _TextLineElement extends RenderObjectElement {

lib/widgets/text_selection.dart

@@ -41,7 +41,8 @@ class EditorTextSelectionOverlay {
   List<OverlayEntry> _handles;
   OverlayEntry toolbar;
 
-  EditorTextSelectionOverlay(this.value,
+  EditorTextSelectionOverlay(
+      this.value,
       this.handlesVisible,
       this.context,
       this.debugRequiredFor,
@@ -107,10 +108,10 @@ class EditorTextSelectionOverlay {
     _toolbarController.forward(from: 0.0);
   }
 
-  Widget _buildHandle(BuildContext context,
+  Widget _buildHandle(
-      _TextSelectionHandlePosition position) {
+      BuildContext context, _TextSelectionHandlePosition position) {
     if ((_selection.isCollapsed &&
-        position == _TextSelectionHandlePosition.END) ||
+            position == _TextSelectionHandlePosition.END) ||
         selectionCtrls == null) {
       return Container();
     }
@@ -144,8 +145,8 @@ class EditorTextSelectionOverlay {
     }
   }
 
-  _handleSelectionHandleChanged(TextSelection newSelection,
+  _handleSelectionHandleChanged(
-      _TextSelectionHandlePosition position) {
+      TextSelection newSelection, _TextSelectionHandlePosition position) {
     TextPosition textPosition;
     switch (position) {
       case _TextSelectionHandlePosition.START:
@@ -168,7 +169,7 @@ class EditorTextSelectionOverlay {
     }
 
     List<TextSelectionPoint> endpoints =
-    renderObject.getEndpointsForSelection(_selection);
+        renderObject.getEndpointsForSelection(_selection);
 
     Rect editingRegion = Rect.fromPoints(
       renderObject.localToGlobal(Offset.zero),
@@ -177,7 +178,7 @@ class EditorTextSelectionOverlay {
 
     double baseLineHeight = renderObject.preferredLineHeight(_selection.base);
     double extentLineHeight =
-    renderObject.preferredLineHeight(_selection.extent);
+        renderObject.preferredLineHeight(_selection.extent);
     double smallestLineHeight = math.min(baseLineHeight, extentLineHeight);
     bool isMultiline = endpoints.last.point.dy - endpoints.first.point.dy >
         smallestLineHeight / 2;
@@ -233,6 +234,21 @@ class EditorTextSelectionOverlay {
     hide();
     _toolbarController.dispose();
   }
+
+  void showHandles() {
+    assert(_handles == null);
+    _handles = <OverlayEntry>[
+      OverlayEntry(
+          builder: (BuildContext context) =>
+              _buildHandle(context, _TextSelectionHandlePosition.START)),
+      OverlayEntry(
+          builder: (BuildContext context) =>
+              _buildHandle(context, _TextSelectionHandlePosition.END)),
+    ];
+
+    Overlay.of(context, rootOverlay: true, debugRequiredFor: debugRequiredFor)
+        .insertAll(_handles);
+  }
 }
 
 class _TextSelectionHandleOverlay extends StatefulWidget {
@@ -319,7 +335,7 @@ class _TextSelectionHandleOverlayState
 
   _handleDragUpdate(DragUpdateDetails details) {
     TextPosition position =
-    widget.renderObject.getPositionForOffset(details.globalPosition);
+        widget.renderObject.getPositionForOffset(details.globalPosition);
     if (widget.selection.isCollapsed) {
       widget.onSelectionHandleChanged(TextSelection.fromPosition(position));
       return;
@@ -332,17 +348,17 @@ class _TextSelectionHandleOverlayState
       case _TextSelectionHandlePosition.START:
         newSelection = TextSelection(
           baseOffset:
-          isNormalized ? position.offset : widget.selection.baseOffset,
+              isNormalized ? position.offset : widget.selection.baseOffset,
           extentOffset:
-          isNormalized ? widget.selection.extentOffset : position.offset,
+              isNormalized ? widget.selection.extentOffset : position.offset,
         );
         break;
       case _TextSelectionHandlePosition.END:
         newSelection = TextSelection(
           baseOffset:
-          isNormalized ? widget.selection.baseOffset : position.offset,
+              isNormalized ? widget.selection.baseOffset : position.offset,
           extentOffset:
-          isNormalized ? position.offset : widget.selection.extentOffset,
+              isNormalized ? position.offset : widget.selection.extentOffset,
         );
         break;
     }
@@ -381,12 +397,12 @@ class _TextSelectionHandleOverlayState
     }
 
     TextPosition textPosition =
-    widget.position == _TextSelectionHandlePosition.START
+        widget.position == _TextSelectionHandlePosition.START
-        ? widget.selection.base
+            ? widget.selection.base
-        : widget.selection.extent;
+            : widget.selection.extent;
     double lineHeight = widget.renderObject.preferredLineHeight(textPosition);
     Offset handleAnchor =
-    widget.selectionControls.getHandleAnchor(type, lineHeight);
+        widget.selectionControls.getHandleAnchor(type, lineHeight);
     Size handleSize = widget.selectionControls.getHandleSize(lineHeight);
 
     Rect handleRect = Rect.fromLTWH(
@@ -442,9 +458,11 @@ class _TextSelectionHandleOverlayState
     );
   }
 
-  TextSelectionHandleType _chooseType(TextDirection textDirection,
+  TextSelectionHandleType _chooseType(
-      TextSelectionHandleType ltrType,
+    TextDirection textDirection,
-      TextSelectionHandleType rtlType,) {
+    TextSelectionHandleType ltrType,
+    TextSelectionHandleType rtlType,
+  ) {
     if (widget.selection.isCollapsed) return TextSelectionHandleType.collapsed;
 
     assert(textDirection != null);
@@ -475,8 +493,7 @@ class EditorTextSelectionGestureDetector extends StatefulWidget {
     this.onDragSelectionEnd,
     this.behavior,
     @required this.child,
-  })
+  })  : assert(child != null),
-      : assert(child != null),
         super(key: key);
 
   final GestureTapDownCallback onTapDown;
@@ -651,34 +668,33 @@ class _EditorTextSelectionGestureDetectorState
   @override
   Widget build(BuildContext context) {
     final Map<Type, GestureRecognizerFactory> gestures =
-    <Type, GestureRecognizerFactory>{};
+        <Type, GestureRecognizerFactory>{};
 
     gestures[_TransparentTapGestureRecognizer] =
         GestureRecognizerFactoryWithHandlers<_TransparentTapGestureRecognizer>(
-              () => _TransparentTapGestureRecognizer(debugOwner: this),
+      () => _TransparentTapGestureRecognizer(debugOwner: this),
-              (_TransparentTapGestureRecognizer instance) {
+      (_TransparentTapGestureRecognizer instance) {
-            instance
+        instance
-              ..onTapDown = _handleTapDown
+          ..onTapDown = _handleTapDown
-              ..onTapUp = _handleTapUp
+          ..onTapUp = _handleTapUp
-              ..onTapCancel = _handleTapCancel;
+          ..onTapCancel = _handleTapCancel;
-          },
+      },
-        );
+    );
 
     if (widget.onSingleLongTapStart != null ||
         widget.onSingleLongTapMoveUpdate != null ||
         widget.onSingleLongTapEnd != null) {
       gestures[LongPressGestureRecognizer] =
           GestureRecognizerFactoryWithHandlers<LongPressGestureRecognizer>(
-                () =>
+        () => LongPressGestureRecognizer(
-                LongPressGestureRecognizer(
+            debugOwner: this, kind: PointerDeviceKind.touch),
-                    debugOwner: this, kind: PointerDeviceKind.touch),
+        (LongPressGestureRecognizer instance) {
-                (LongPressGestureRecognizer instance) {
+          instance
-              instance
+            ..onLongPressStart = _handleLongPressStart
-                ..onLongPressStart = _handleLongPressStart
+            ..onLongPressMoveUpdate = _handleLongPressMoveUpdate
-                ..onLongPressMoveUpdate = _handleLongPressMoveUpdate
+            ..onLongPressEnd = _handleLongPressEnd;
-                ..onLongPressEnd = _handleLongPressEnd;
+        },
-            },
+      );
-          );
     }
 
     if (widget.onDragSelectionStart != null ||
@@ -686,32 +702,29 @@ class _EditorTextSelectionGestureDetectorState
         widget.onDragSelectionEnd != null) {
       gestures[HorizontalDragGestureRecognizer] =
           GestureRecognizerFactoryWithHandlers<HorizontalDragGestureRecognizer>(
-                () =>
+        () => HorizontalDragGestureRecognizer(
-                HorizontalDragGestureRecognizer(
+            debugOwner: this, kind: PointerDeviceKind.mouse),
-                    debugOwner: this, kind: PointerDeviceKind.mouse),
+        (HorizontalDragGestureRecognizer instance) {
-                (HorizontalDragGestureRecognizer instance) {
+          instance
-              instance
+            ..dragStartBehavior = DragStartBehavior.down
-                ..dragStartBehavior = DragStartBehavior.down
+            ..onStart = _handleDragStart
-                ..onStart = _handleDragStart
+            ..onUpdate = _handleDragUpdate
-                ..onUpdate = _handleDragUpdate
+            ..onEnd = _handleDragEnd;
-                ..onEnd = _handleDragEnd;
+        },
-            },
+      );
-          );
     }
 
     if (widget.onForcePressStart != null || widget.onForcePressEnd != null) {
       gestures[ForcePressGestureRecognizer] =
           GestureRecognizerFactoryWithHandlers<ForcePressGestureRecognizer>(
-                () => ForcePressGestureRecognizer(debugOwner: this),
+        () => ForcePressGestureRecognizer(debugOwner: this),
-                (ForcePressGestureRecognizer instance) {
+        (ForcePressGestureRecognizer instance) {
-              instance
+          instance
-                ..onStart =
+            ..onStart =
                 widget.onForcePressStart != null ? _forcePressStarted : null
-                ..onEnd = widget.onForcePressEnd != null
+            ..onEnd = widget.onForcePressEnd != null ? _forcePressEnded : null;
-                    ? _forcePressEnded
+        },
-                    : null;
+      );
-            },
-          );
     }
 
     return RawGestureDetector(