operator == method
- @override
The equality operator.
The default behavior for all Objects is to return true if and
only if this
and other
are the same object.
Override this method to specify a different equality relation on a class. The overriding method must still be an equivalence relation. That is, it must be:
-
Total: It must return a boolean for all arguments. It should never throw or return
null
. -
Reflexive: For all objects
o
,o == o
must be true. -
Symmetric: For all objects
o1
ando2
,o1 == o2
ando2 == o1
must either both be true, or both be false. -
Transitive: For all objects
o1
,o2
, ando3
, ifo1 == o2
ando2 == o3
are true, theno1 == o3
must be true.
The method should also be consistent over time, so whether two objects are equal should only change if at least one of the objects was modified.
If a subclass overrides the equality operator it should override the hashCode method as well to maintain consistency.
Implementation
@override
bool operator ==(dynamic other) {
if (other is! SemanticsData)
return false;
final SemanticsData typedOther = other;
return typedOther.flags == flags
&& typedOther.actions == actions
&& typedOther.label == label
&& typedOther.value == value
&& typedOther.increasedValue == increasedValue
&& typedOther.decreasedValue == decreasedValue
&& typedOther.hint == hint
&& typedOther.textDirection == textDirection
&& typedOther.rect == rect
&& setEquals(typedOther.tags, tags)
&& typedOther.scrollChildCount == scrollChildCount
&& typedOther.scrollIndex == scrollIndex
&& typedOther.textSelection == textSelection
&& typedOther.scrollPosition == scrollPosition
&& typedOther.scrollExtentMax == scrollExtentMax
&& typedOther.scrollExtentMin == scrollExtentMin
&& typedOther.transform == transform
&& _sortedListsEqual(typedOther.customSemanticsActionIds, customSemanticsActionIds);
}