formatEditUpdate method
- @override
Called when text is being typed or cut/copy/pasted in the EditableText
.
You can override the resulting text based on the previous text value and the incoming new text value.
When formatters are chained, oldValue
reflects the initial value of
TextEditingValue
at the beginning of the chain.
Implementation
@override
TextEditingValue formatEditUpdate(
TextEditingValue oldValue, TextEditingValue newValue) {
final newTextLength = newValue.text.length;
var selectionIndex = newValue.selection.end;
if (newTextLength > maxLength) {
return oldValue;
}
var usedSubstringIndex = 0;
final newText = StringBuffer();
if (centavos) {
maxLength = 14;
switch (newTextLength) {
case 3:
newText.write(newValue.text.substring(0, 1) +
',' +
newValue.text.substring(1, usedSubstringIndex = 2));
selectionIndex = 4;
break;
case 4:
newText.write(newValue.text.substring(0, 2) +
',' +
newValue.text.substring(2, usedSubstringIndex = 3));
selectionIndex = 5;
break;
case 5:
newText.write(newValue.text.substring(0, 3) +
',' +
newValue.text.substring(3, usedSubstringIndex = 5));
selectionIndex = 6;
break;
case 6:
newText.write(newValue.text.substring(0, 1) +
'.' +
newValue.text.substring(1, 4) +
',' +
newValue.text.substring(4, usedSubstringIndex = 5));
selectionIndex = 8;
break;
case 7:
newText.write(newValue.text.substring(0, 2) +
'.' +
newValue.text.substring(2, 5) +
',' +
newValue.text.substring(5, usedSubstringIndex = 6));
selectionIndex = 9;
break;
case 8:
newText.write(newValue.text.substring(0, 3) +
'.' +
newValue.text.substring(3, 6) +
',' +
newValue.text.substring(6, usedSubstringIndex = 7));
selectionIndex = 10;
break;
case 9:
newText.write(newValue.text.substring(0, 1) +
'.' +
newValue.text.substring(1, 4) +
'.' +
newValue.text.substring(4, 7) +
',' +
newValue.text.substring(7, usedSubstringIndex = 8));
selectionIndex = 12;
break;
case 10:
newText.write(newValue.text.substring(0, 2) +
'.' +
newValue.text.substring(2, 5) +
'.' +
newValue.text.substring(5, 8) +
',' +
newValue.text.substring(8, usedSubstringIndex = 9));
selectionIndex = 13;
break;
case 11:
newText.write(newValue.text.substring(0, 3) +
'.' +
newValue.text.substring(3, 6) +
'.' +
newValue.text.substring(6, 9) +
',' +
newValue.text.substring(9, usedSubstringIndex = 10));
selectionIndex = 14;
break;
case 12:
newText.write(newValue.text.substring(0, 1) +
'.' +
newValue.text.substring(1, 4) +
'.' +
newValue.text.substring(4, 7) +
'.' +
newValue.text.substring(7, 10) +
',' +
newValue.text.substring(10, usedSubstringIndex = 11));
selectionIndex = 16;
break;
case 13:
newText.write(newValue.text.substring(0, 2) +
'.' +
newValue.text.substring(2, 5) +
'.' +
newValue.text.substring(5, 8) +
'.' +
newValue.text.substring(8, 11) +
',' +
newValue.text.substring(11, usedSubstringIndex = 11));
selectionIndex = 17;
break;
case 14:
newText.write(newValue.text.substring(0, 3) +
'.' +
newValue.text.substring(3, 6) +
'.' +
newValue.text.substring(6, 9) +
'.' +
newValue.text.substring(9, 12) +
',' +
newValue.text.substring(12, usedSubstringIndex = 13));
selectionIndex = 18;
break;
}
} else {
switch (newTextLength) {
case 4:
newText.write(newValue.text.substring(0, 1) +
'.' +
newValue.text.substring(1, usedSubstringIndex = 3));
selectionIndex = 5;
break;
case 5:
newText.write(newValue.text.substring(0, 2) +
'.' +
newValue.text.substring(2, usedSubstringIndex = 3));
selectionIndex = 6;
break;
case 6:
newText.write(newValue.text.substring(0, 3) +
'.' +
newValue.text.substring(3, usedSubstringIndex = 3));
selectionIndex = 7;
break;
case 7:
newText.write(newValue.text.substring(0, 1) +
'.' +
newValue.text.substring(1, 4) +
'.' +
newValue.text.substring(4, usedSubstringIndex = 5));
selectionIndex = 9;
break;
case 8:
newText.write(newValue.text.substring(0, 2) +
'.' +
newValue.text.substring(2, 5) +
'.' +
newValue.text.substring(5, usedSubstringIndex = 6));
selectionIndex = 10;
break;
case 9:
newText.write(newValue.text.substring(0, 3) +
'.' +
newValue.text.substring(3, 6) +
'.' +
newValue.text.substring(6, usedSubstringIndex = 7));
selectionIndex = 11;
break;
case 10:
newText.write(newValue.text.substring(0, 1) +
'.' +
newValue.text.substring(1, 4) +
'.' +
newValue.text.substring(4, 7) +
'.' +
newValue.text.substring(7, usedSubstringIndex = 10));
selectionIndex = 13;
break;
case 11:
newText.write(newValue.text.substring(0, 2) +
'.' +
newValue.text.substring(2, 5) +
'.' +
newValue.text.substring(5, 8) +
'.' +
newValue.text.substring(8, usedSubstringIndex = 11));
selectionIndex = 14;
break;
case 12:
newText.write(newValue.text.substring(0, 3) +
'.' +
newValue.text.substring(3, 6) +
'.' +
newValue.text.substring(6, 9) +
'.' +
newValue.text.substring(9, usedSubstringIndex = 12));
selectionIndex = 15;
break;
}
}
if (newTextLength >= usedSubstringIndex) {
newText.write(newValue.text.substring(usedSubstringIndex));
}
return TextEditingValue(
text: newText.toString(),
selection: TextSelection.collapsed(offset: selectionIndex),
);
}