diff options
author | Andre de la Rocha <andre.rocha@qt.io> | 2020-03-02 20:30:13 +0100 |
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committer | Andre de la Rocha <andre.rocha@qt.io> | 2020-03-04 13:09:48 +0100 |
commit | 566def740ec58e842e6bb37177f80e20aebaa245 (patch) | |
tree | aa2bac7a70531a0e84e5fade27c70f4a1b41affa /src/plugins | |
parent | 295a16b0d3836a8f41b5133bcd9f355afb03f38b (diff) |
Windows QPA: Add support to UiaRaiseNotificationEvent()
This change adds support to UiaRaiseNotificationEvent() in the
UI Automation-based accessibility code, and uses it to notify changes
in string-typed values, allowing Narrator, NVDA and other screen readers
to notice changes in the application state that were previously missed.
Fixes: QTBUG-75003
Change-Id: I646ca3a851ab7b69817d900b002eb91a3bf607a6
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Diffstat (limited to 'src/plugins')
-rw-r--r-- | src/plugins/platforms/windows/uiautomation/qwindowsuiamainprovider.cpp | 26 |
1 files changed, 21 insertions, 5 deletions
diff --git a/src/plugins/platforms/windows/uiautomation/qwindowsuiamainprovider.cpp b/src/plugins/platforms/windows/uiautomation/qwindowsuiamainprovider.cpp index 9adc5c78dd..59360616a1 100644 --- a/src/plugins/platforms/windows/uiautomation/qwindowsuiamainprovider.cpp +++ b/src/plugins/platforms/windows/uiautomation/qwindowsuiamainprovider.cpp @@ -166,11 +166,27 @@ void QWindowsUiaMainProvider::notifyValueChange(QAccessibleValueChangeEvent *eve } if (event->value().type() == QVariant::String) { if (QWindowsUiaMainProvider *provider = providerForAccessible(accessible)) { - // Notifies changes in string values. - VARIANT oldVal, newVal; - clearVariant(&oldVal); - setVariantString(event->value().toString(), &newVal); - QWindowsUiaWrapper::instance()->raiseAutomationPropertyChangedEvent(provider, UIA_ValueValuePropertyId, oldVal, newVal); + + // Tries to notify the change using UiaRaiseNotificationEvent(), which is only available on + // Windows 10 version 1709 or newer. Otherwise uses UiaRaiseAutomationPropertyChangedEvent(). + + BSTR displayString = bStrFromQString(event->value().toString()); + BSTR activityId = bStrFromQString(QString()); + + HRESULT hr = QWindowsUiaWrapper::instance()->raiseNotificationEvent(provider, NotificationKind_Other, + NotificationProcessing_ImportantMostRecent, + displayString, activityId); + + ::SysFreeString(displayString); + ::SysFreeString(activityId); + + if (hr == static_cast<HRESULT>(UIA_E_NOTSUPPORTED)) { + VARIANT oldVal, newVal; + clearVariant(&oldVal); + setVariantString(event->value().toString(), &newVal); + QWindowsUiaWrapper::instance()->raiseAutomationPropertyChangedEvent(provider, UIA_ValueValuePropertyId, oldVal, newVal); + ::SysFreeString(newVal.bstrVal); + } } } else if (QAccessibleValueInterface *valueInterface = accessible->valueInterface()) { if (QWindowsUiaMainProvider *provider = providerForAccessible(accessible)) { |