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Concepts

Common Flutter errors and how to fix them3.47.7widgets
main axis. Give it a size with Expanded or SizedBox. 'Incorrect use of ParentDataWidget': Expanded/Flexible must be direct children of Row/Column/Flex, Positioned of Stack, TableCell of Table

API reference

ParentDataWidgetclass
Base class for widgets that hook ParentData information to children of RenderObjectWidgets. widgets.ParentDataWidget ParentDataWidget Parent Data Widget class widgets
ParentDataWidget.newconstructor
provide const constructors so that they can be used in const expressions. widgets.ParentDataWidget.ParentDataWidget.new ParentDataWidget new Parent Data Widget.new constructor widgets
ParentDataElementclass
Element that uses a ParentDataWidget as its configuration. widgets.ParentDataElement ParentDataElement Parent Data Element class widgets

Version changes

Generic type of ParentDataWidget changed to ParentData1.17.0breaking
Flutter version that includes this change: ```plaintext error • Missing concrete implementation of 'getter ParentDataWidget.debugTypicalAncestorWidgetClass' • lib/main.dart:114:7 • non_abstrac