base property Null safety
The position at which the selection originates.
The TextAffinity of the resulting TextPosition is based on the relative logical position in the text to the other selection endpoint:
- if baseOffset < extentOffset, base will have TextAffinity.downstream and extent will have TextAffinity.upstream.
- if baseOffset > extentOffset, base will have TextAffinity.upstream and extent will have TextAffinity.downstream.
- if baseOffset == extentOffset, base and extent will both have the collapsed selection's affinity.
Might be larger than, smaller than, or equal to extent.
Implementation
TextPosition get base {
final TextAffinity affinity;
if (!isValid || baseOffset == extentOffset) {
affinity = this.affinity;
} else if (baseOffset < extentOffset) {
affinity = TextAffinity.downstream;
} else {
affinity = TextAffinity.upstream;
}
return TextPosition(offset: baseOffset, affinity: affinity);
}