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 (identical(this, other))
return true;
if (other is! TextStyle)
return false;
final TextStyle typedOther = other;
if (_fontFamily != typedOther._fontFamily ||
_fontSize != typedOther._fontSize ||
_letterSpacing != typedOther._letterSpacing ||
_wordSpacing != typedOther._wordSpacing ||
_height != typedOther._height ||
_locale != typedOther._locale ||
_background != typedOther._background ||
_foreground != typedOther._foreground)
return false;
for (int index = 0; index < _encoded.length; index += 1) {
if (_encoded[index] != typedOther._encoded[index])
return false;
}
if (!Shadow._shadowsListEquals(_shadows, typedOther._shadows))
return false;
return true;
}