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fix:【update Demo】manualDelete function support delete system emoji #219

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fix:【update Demo】manualDelete function support delete system emoji #219

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28 changes: 27 additions & 1 deletion example/lib/pages/complex/text_demo.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -420,6 +420,28 @@ class _TextDemoState extends State<TextDemo> {
});
}


// Is then code (a 16-bit unsigned integer) a UTF-16 lead surrogate.
bool _isLeadSurrogate(int code) => (code & 0xFC00) == 0xD800;

// Is then code (a 16-bit unsigned integer) a UTF-16 trail surrogate.
bool _isTrailSurrogate(int code) => (code & 0xFC00) == 0xDC00;


bool checkIsUTF16(String content, int index) {
if(content.isEmpty || index < 0) {
return false;
}
final int code = content.codeUnitAt(index);
if (_isTrailSurrogate(code) && content.length > 1 && index >= 1) {
final int previousCode = content.codeUnitAt(index - 1);
if (_isLeadSurrogate(previousCode)) {
return true;
}
}
return false;
}

void manualDelete() {
//delete by code
final TextEditingValue _value = _textEditingController.value;
Expand All @@ -433,10 +455,14 @@ class _TextDemoState extends State<TextDemo> {
if (selection.isCollapsed && selection.start == 0) {
return;
}
final int start =
int start =
selection.isCollapsed ? selection.start - 1 : selection.start;
final int end = selection.end;

if(checkIsUTF16(actualText, end - 1)){
start--;
}

value = TextEditingValue(
text: actualText.replaceRange(start, end, ''),
selection: TextSelection.collapsed(offset: start),
Expand Down