a11y uia: Forward new QAccessibleAnnouncementEvent to UIA

Bridge the newly added QAccessibleAnnouncementEvent to UIA
on Windows, by calling UiaRaiseNotificationEvent [1].

This makes the announcement from the example app attached
to QTBUG-75003 work when using the NVDA screen reader on Windows.

As described in commit d25d9f2c2673bc287590d9a83bd7ef1357d7021a,
implement the UiaRaiseNotificationEvent function for MingW
in qwindowsuiautomation as MingW doesn't provide that
itself yet (see the earlier MingW build failure without
that "kludge" in place: [2]).

[1] https://learn.microsoft.com/en-us/windows/win32/api/uiautomationcoreapi/nf-uiautomationcoreapi-uiaraisenotificationevent
[2] https://testresults.qt.io/logs/qt/qtbase/e56b201c7260ebb02ca2d030a71b9f11e40a08ac/WindowsWindows_11_23H2x86_64WindowsWindows_11_23H2x86_64Clangqtci-windows-11_23H2-x86_64-52-8f4da0Sccache_UseConfigure/a2e63edda6293b516dbe4a96615c7aa3530d3c4d/build_1714142084/log.txt.gz

Fixes: QTBUG-75003
Change-Id: Ia32d49276e0dd33cff5113b4169ee317869390e7
Reviewed-by: Oliver Wolff <oliver.wolff@qt.io>

4 files changed, 30 insertions, 0 deletions

diff --git a/src/plugins/platforms/windows/uiautomation/qwindowsuiaaccessibility.cpp b/src/plugins/platforms/windows/uiautomation/qwindowsuiaaccessibility.cpp
index 1abb412ccd..5892493281 100644
--- a/src/plugins/platforms/windows/uiautomation/qwindowsuiaaccessibility.cpp
+++ b/src/plugins/platforms/windows/uiautomation/qwindowsuiaaccessibility.cpp
@@ -127,6 +127,9 @@ void QWindowsUiaAccessibility::notifyAccessibilityUpdate(QAccessibleEvent *event
         return;
 
     switch (event->type()) {
+    case QAccessible::Announcement:
+        QWindowsUiaMainProvider::raiseNotification(static_cast<QAccessibleAnnouncementEvent *>(event));
+        break;
     case QAccessible::Focus:
         QWindowsUiaMainProvider::notifyFocusChange(event);
         break;
diff --git a/src/plugins/platforms/windows/uiautomation/qwindowsuiamainprovider.cpp b/src/plugins/platforms/windows/uiautomation/qwindowsuiamainprovider.cpp
index 95ddbcced6..b8f2d0eadd 100644
--- a/src/plugins/platforms/windows/uiautomation/qwindowsuiamainprovider.cpp
+++ b/src/plugins/platforms/windows/uiautomation/qwindowsuiamainprovider.cpp
@@ -204,6 +204,24 @@ void QWindowsUiaMainProvider::notifyTextChange(QAccessibleEvent *event)
     }
 }
 
+void QWindowsUiaMainProvider::raiseNotification(QAccessibleAnnouncementEvent *event)
+{
+    if (QAccessibleInterface *accessible = event->accessibleInterface()) {
+        if (QWindowsUiaMainProvider *provider = providerForAccessible(accessible)) {
+            BSTR message = bStrFromQString(event->message());
+            QAccessible::AnnouncementPriority prio = event->priority();
+            NotificationProcessing processing = (prio == QAccessible::AnnouncementPriority::Assertive)
+                    ? NotificationProcessing_ImportantAll
+                    : NotificationProcessing_All;
+            BSTR activityId = bStrFromQString(QString::fromLatin1(""));
+            UiaRaiseNotificationEvent(provider, NotificationKind_Other, processing, message, activityId);
+
+            ::SysFreeString(message);
+            ::SysFreeString(activityId);
+        }
+    }
+}
+
 HRESULT STDMETHODCALLTYPE QWindowsUiaMainProvider::QueryInterface(REFIID iid, LPVOID *iface)
 {
     HRESULT result = QComObject::QueryInterface(iid, iface);
diff --git a/src/plugins/platforms/windows/uiautomation/qwindowsuiamainprovider.h b/src/plugins/platforms/windows/uiautomation/qwindowsuiamainprovider.h
index 99db0ed318..b24f4a6cc3 100644
--- a/src/plugins/platforms/windows/uiautomation/qwindowsuiamainprovider.h
+++ b/src/plugins/platforms/windows/uiautomation/qwindowsuiamainprovider.h
@@ -34,6 +34,7 @@ public:
     static void notifyNameChange(QAccessibleEvent *event);
     static void notifySelectionChange(QAccessibleEvent *event);
     static void notifyTextChange(QAccessibleEvent *event);
+    static void raiseNotification(QAccessibleAnnouncementEvent *event);
 
     // IUnknown
     HRESULT STDMETHODCALLTYPE QueryInterface(REFIID id, LPVOID *iface) override;
diff --git a/src/plugins/platforms/windows/uiautomation/qwindowsuiautomation.cpp b/src/plugins/platforms/windows/uiautomation/qwindowsuiautomation.cpp
index 1593a07202..6954a881d0 100644
--- a/src/plugins/platforms/windows/uiautomation/qwindowsuiautomation.cpp
+++ b/src/plugins/platforms/windows/uiautomation/qwindowsuiautomation.cpp
@@ -69,6 +69,14 @@ HRESULT WINAPI UiaRaiseAutomationEvent(IRawElementProviderSimple *pProvider, EVE
     return func.invoke(pProvider, id);
 }
 
+HRESULT WINAPI UiaRaiseNotificationEvent(
+    IRawElementProviderSimple *pProvider, NotificationKind notificationKind,
+    NotificationProcessing notificationProcessing, BSTR displayString, BSTR activityId)
+{
+    static auto func = winapi_func("uiautomationcore", FN(UiaRaiseNotificationEvent));
+    return func.invoke(pProvider, notificationKind, notificationProcessing, displayString, activityId);
+}
+
 #endif // defined(__MINGW32__) || defined(__MINGW64__)
 
 #endif // QT_CONFIG(accessibility)