visitChildrenOfAnyType method

@override bool visitChildrenOfAnyType(CancelableObjectVisitor visitor)

The implementation should call visitor for each immediate child of this object.

If visitor returns false it should return false immediately, canceling the iteration over its children.

Implementation

@override
bool visitChildrenOfAnyType(CancelableObjectVisitor visitor) {
  var child = firstChild;
  var textIndex = 0;
  var i = 0;

  for (final el in _textAndWidgets) {
    if (el is Widget) {
      final floatData = child!.floatData;
      assert(floatData.index == i && floatData.placeholderIndex == 0);

      // Visit the child widget's render object.
      if (!visitor(child)) return false; //------------------------------->
      child = childAfter(child);
    } else if (el is WrappableText) {
      final wtr = _cache[textIndex++];
      assert(wtr.renderer.placeholderSpans.isEmpty ||
          (child != null && child.floatData.index == i));

      // Visit all the text renderers.
      for (final textRenderer in wtr.renderers) {
        if (!visitor(textRenderer)) return false; //---------------------->
      }

      // Visit all the child render objects embedded in the text.
      var widgetIndex = 0;
      while (child != null && child.floatData.index == i) {
        assert(child.floatData.placeholderIndex == widgetIndex);
        if (!visitor(child)) return false; //----------------------------->
        child = childAfter(child);
        widgetIndex++;
      }
    } else {
      assert(false);
    }

    i++;
  }
  return true;
}