commit | 67d4a831165d828fcf8afb6ff4a93ef67e8228d6 | [log] [tgz] |
---|---|---|
author | Kate Lovett <katelovett@google.com> | Tue Sep 26 17:38:18 2023 -0500 |
committer | GitHub <noreply@github.com> | Tue Sep 26 22:38:18 2023 +0000 |
tree | 4f23e6af390d0a17fde1021a0e07a0cb203fcf74 | |
parent | d81c8aa88b8b84a75313a32cb26468540d50fee4 [diff] |
Allow multiple ParentDataWidgets to write to ParentData (#133581) Fixes https://github.com/flutter/flutter/issues/133089 This allows more than one ParentDataWidget to write to the ParentData of a child render object. Previously only one was allowed. There are some rules though: 1. Only one of a given type of `ParentDataWidget` can write to the `ParentData` of a given child. a. For example, 2 `Positioned` widgets wrapping a child of a `Stack` would not be allowed, as only one of type `Positioned` can contribute data. 2. The type of `ParentData` **must** be compatible with all of the `ParentDataWidget`s that want to contribute data. a. For example, `TwoDimensionalViewportParentData` mixes in the `KeepAliveParentDataMixin`. So the `ParentData` of a given child would be compatible with the `KeepAlive` `ParentDataWidget`, as well as another `ParentDataWidget` that writes `TwoDimensionalViewportParentData` (or a subclass of `TwoDimensionalViewportParentData` - This was the motivation for this change, where a `ParentDataWidget` is being used in `TableView` with the parent data type being a subclass of `TwoDimensionalViewportParentData`.)
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