onSingleLongTapMoveUpdate method

Implementation

@protected
void onSingleLongTapMoveUpdate(LongPressMoveUpdateDetails details) {
  if (!delegate.selectionEnabled) {
    return;
  }
  // Adjust the drag start offset for possible viewport offset changes.
  final Offset editableOffset = renderEditable.maxLines == 1
      ? Offset(renderEditable.offset.pixels - _dragStartViewportOffset, 0.0)
      : Offset(0.0, renderEditable.offset.pixels - _dragStartViewportOffset);
  final Offset scrollableOffset = switch (axisDirectionToAxis(_scrollDirection ?? AxisDirection.left)) {
    Axis.horizontal => Offset(_scrollPosition - _dragStartScrollOffset, 0.0),
    Axis.vertical   => Offset(0.0, _scrollPosition - _dragStartScrollOffset),
  };
  switch (defaultTargetPlatform) {
    case TargetPlatform.iOS:
    case TargetPlatform.macOS:
      if (_longPressStartedWithoutFocus || renderEditable.readOnly) {
        renderEditable.selectWordsInRange(
          from: details.globalPosition - details.offsetFromOrigin - editableOffset - scrollableOffset,
          to: details.globalPosition,
          cause: SelectionChangedCause.longPress,
        );
      } else {
        renderEditable.selectPositionAt(
          from: details.globalPosition,
          cause: SelectionChangedCause.longPress,
        );
        // Update the floating cursor.
        final RawFloatingCursorPoint cursorPoint = RawFloatingCursorPoint(
          state: FloatingCursorDragState.Update,
          offset: details.offsetFromOrigin,
        );
        editableText.updateFloatingCursor(cursorPoint);
      }
    case TargetPlatform.android:
    case TargetPlatform.fuchsia:
    case TargetPlatform.linux:
    case TargetPlatform.windows:
      renderEditable.selectWordsInRange(
        from: details.globalPosition - details.offsetFromOrigin - editableOffset - scrollableOffset,
        to: details.globalPosition,
        cause: SelectionChangedCause.longPress,
      );
  }

  _showMagnifierIfSupportedByPlatform(details.globalPosition);
}