Use @required for onPressed and onChanged
#4534
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We now use the `@required` annotation to encourage developers to explicitly set onPressed and onChanged callbacks to null when that would disable the widget. Fixes flutter#287
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LGTM from my end but will defer to @Hixie on semantics... |
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We now use the
@requiredannotation to encourage developers toexplicitly set onPressed and onChanged callbacks to null when that would
disable the widget.
Fixes #287