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Merge pull request #1710 from Hixie/unique-key

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UniqueKey
This commit is contained in:
Ian Hickson 2015-10-21 11:08:44 -07:00
commit 97251bcbb5
1 changed files with 6 additions and 0 deletions
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6
sky/packages/sky/lib/src/widgets/framework.dart
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@ -42,6 +42,12 @@ class ValueKey<T> extends Key {
String toString() => '[\'$value\']';
}
/// A [Key] that is only equal to itself.
class UniqueKey extends Key {
const UniqueKey() : super.constructor();
String toString() => '[$hashCode]';
}
/// A kind of [Key] that takes its identity from the object used as its value.
///
/// Used to tie the identity of a Widget to the identity of an object used to