Flutter: @override formatEditUpdate called a second time with previous newValue
If I create a class that extends TextInputFormatter and override formatEditUpdate(oldValue, newValue) which generates a result different than newValue, why is formatEditUpdate immediately called again with the newValue set to the newValue from the previous execution?
The test cases pass because the initial result correctly returns the value from the override, but in an interactive app, after it runs a second time, the cursor location is incorrect because it is based on the newValue from the first execution instead of the result of the override.
The flow can be seen in the flutter gallery at:
flutter/examples/flutter_gallery/lib/demo/material/text_form_field_demo.dart
if you enter the following print statement above the return on line 333:
print('oldValue: ${oldValue.text} newValue: ${newValue.text} output: ${newText.toString()}');
return TextEditingValue(
Then run the app and enter digits for the material phone number and watch the function get called multiple times after every digit is entered.
flutter asked Nov 22 '18 at 0:54
SimplerSimpler
19812
add a comment |
If I create a class that extends TextInputFormatter and override formatEditUpdate(oldValue, newValue) which generates a result different than newValue, why is formatEditUpdate immediately called again with the newValue set to the newValue from the previous execution?
The test cases pass because the initial result correctly returns the value from the override, but in an interactive app, after it runs a second time, the cursor location is incorrect because it is based on the newValue from the first execution instead of the result of the override.
The flow can be seen in the flutter gallery at:
flutter/examples/flutter_gallery/lib/demo/material/text_form_field_demo.dart
if you enter the following print statement above the return on line 333:
print('oldValue: ${oldValue.text} newValue: ${newValue.text} output: ${newText.toString()}');
return TextEditingValue(
Then run the app and enter digits for the material phone number and watch the function get called multiple times after every digit is entered.
flutter asked Nov 22 '18 at 0:54
SimplerSimpler
19812
add a comment |
If I create a class that extends TextInputFormatter and override formatEditUpdate(oldValue, newValue) which generates a result different than newValue, why is formatEditUpdate immediately called again with the newValue set to the newValue from the previous execution?
The test cases pass because the initial result correctly returns the value from the override, but in an interactive app, after it runs a second time, the cursor location is incorrect because it is based on the newValue from the first execution instead of the result of the override.
The flow can be seen in the flutter gallery at:
flutter/examples/flutter_gallery/lib/demo/material/text_form_field_demo.dart
if you enter the following print statement above the return on line 333:
print('oldValue: ${oldValue.text} newValue: ${newValue.text} output: ${newText.toString()}');
return TextEditingValue(
Then run the app and enter digits for the material phone number and watch the function get called multiple times after every digit is entered.
flutter asked Nov 22 '18 at 0:54
SimplerSimpler
19812
If I create a class that extends TextInputFormatter and override formatEditUpdate(oldValue, newValue) which generates a result different than newValue, why is formatEditUpdate immediately called again with the newValue set to the newValue from the previous execution?
The test cases pass because the initial result correctly returns the value from the override, but in an interactive app, after it runs a second time, the cursor location is incorrect because it is based on the newValue from the first execution instead of the result of the override.
The flow can be seen in the flutter gallery at:
flutter/examples/flutter_gallery/lib/demo/material/text_form_field_demo.dart
if you enter the following print statement above the return on line 333:
print('oldValue: ${oldValue.text} newValue: ${newValue.text} output: ${newText.toString()}');
return TextEditingValue(
Then run the app and enter digits for the material phone number and watch the function get called multiple times after every digit is entered.
flutter flutter asked Nov 22 '18 at 0:54
SimplerSimpler
19812
asked Nov 22 '18 at 0:54
SimplerSimpler
19812
edited Nov 22 '18 at 1:42
Simpler
asked Nov 22 '18 at 0:54
SimplerSimpler
19812
asked Nov 22 '18 at 0:54
SimplerSimpler
19812
asked Nov 22 '18 at 0:54
SimplerSimpler
19812
19812
add a comment |
add a comment |
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