calculateTextDirection method

TextDirection calculateTextDirection({ TextDirection? layoutDirection, })

Calculate the text direction of a block component.

Implementation

// defaultTextDirection will be ltr if caller hasn't passed any value.
TextDirection calculateTextDirection({TextDirection? layoutDirection}) {
  layoutDirection ??= TextDirection.ltr;
  final defaultTextDirection = editorState.editorStyle.defaultTextDirection;

  final direction = calculateNodeDirection(
    node: node,
    layoutDirection: layoutDirection,
    defaultTextDirection: defaultTextDirection,
    lastDirection: lastDirection,
  );

  // node indent padding is added by parent node and the padding direction
  // is equal to the node text direction. when the node direction is auto
  // there is a special case which on typing text, the node direction could
  // change without any change to parent node, because no attribute of the
  // node changes as the direction attribute is auto but the calculated can
  // change to rtl or ltr. in this cases we should notify parent node to
  // recalculate the indent padding.
  if (node.level > 1 &&
      direction != lastDirection &&
      node.direction(defaultTextDirection) ==
          blockComponentTextDirectionAuto) {
    WidgetsBinding.instance
        .addPostFrameCallback((_) => node.parent?.notify());
  }
  lastDirection = direction;

  return direction;
}