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Raise UIA TextSelectionChanged in TextInput so screen readers announce caret navigation #16276

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Raise UIA TextSelectionChanged in TextInput so screen readers announce caret navigation #16276

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7 changes: 7 additions & 0 deletions change/react-native-windows-b55776cc-2475-4854-b426-d55aed0fddb3.json
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Original file line number Diff line number Diff line change
@@ -0,0 +1,7 @@
{
"type": "prerelease",
"comment": "Raise a UIA TextSelectionChanged event when the TextInput caret/selection moves, so Narrator and braille displays announce character/word/line navigation during keyboard caret movement",
"packageName": "react-native-windows",
"email": "clintc@microsoft.com",
"dependentChangeType": "patch"
}
11 changes: 11 additions & 0 deletions vnext/Microsoft.ReactNative/Fabric/Composition/TextInput/WindowsTextInputComponentView.cpp
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Expand Up @@ -1457,6 +1457,17 @@ void WindowsTextInputComponentView::OnSelectionChanged(LONG start, LONG end) noe
onSelectionChangeArgs.selection.end = end;
emitter->onSelectionChange(onSelectionChangeArgs);
}

// Notify UI Automation clients (e.g. Narrator and braille displays) that the caret or
// selection moved, so they re-read the current character/word/line during keyboard
// navigation. Without this, arrowing through the text is silent for screen readers.
// Mirrors the focus- and value-changed raises elsewhere in the Composition layer.
if (UiaClientsAreListening()) {
auto spProviderSimple = EnsureUiaProvider().try_as<IRawElementProviderSimple>();
if (spProviderSimple != nullptr) {
UiaRaiseAutomationEvent(spProviderSimple.get(), UIA_Text_TextSelectionChangedEventId);
}
}
}

std::string WindowsTextInputComponentView::GetTextFromRichEdit() const noexcept {
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