diff options
| author | André de la Rocha <andre.rocha@qt.io> | 2022-03-25 14:40:56 -0300 |
|---|---|---|
| committer | André de la Rocha <andre.rocha@qt.io> | 2022-03-31 09:04:08 -0300 |
| commit | 350a75f792156724a620ddfb987c27cfd767abbf (patch) | |
| tree | 86c9e9ba2ed2465287b47448a2688f8b262b21a9 /src/plugins/platforms/windows | |
| parent | bcd0a3220348778c0d72faac202efb97f4d6dd07 (diff) | |
Windows QPA: Avoid sending accessibility notifications before activation
When accessibility was activated after the application startup, it would
send state update notifications for every accessible object, which for a
large number of objects could result in a flood of UI Automation
notifications and UI slowdown. This patch ignores these notifications
until QAccessible is activated, which should avoid the slowdown and
seems to cause no side effects with accessibility tools.
Fixes: QTBUG-95114
Pick-to: 6.2 6.3 5.15
Change-Id: If1495d0aa846d7810b3d297b7e156563a7e5f6e6
Reviewed-by: Jan Arve Sæther <jan-arve.saether@qt.io>
Diffstat (limited to 'src/plugins/platforms/windows')
| -rw-r--r-- | src/plugins/platforms/windows/uiautomation/qwindowsuiaaccessibility.cpp | 7 | ||||
| -rw-r--r-- | src/plugins/platforms/windows/uiautomation/qwindowsuiaaccessibility.h | 2 |
2 files changed, 9 insertions, 0 deletions
diff --git a/src/plugins/platforms/windows/uiautomation/qwindowsuiaaccessibility.cpp b/src/plugins/platforms/windows/uiautomation/qwindowsuiaaccessibility.cpp index 0903f5a618..5f87badd51 100644 --- a/src/plugins/platforms/windows/uiautomation/qwindowsuiaaccessibility.cpp +++ b/src/plugins/platforms/windows/uiautomation/qwindowsuiaaccessibility.cpp @@ -58,6 +58,7 @@ QT_BEGIN_NAMESPACE using namespace QWindowsUiAutomation; +bool QWindowsUiaAccessibility::m_accessibleActive = false; QWindowsUiaAccessibility::QWindowsUiaAccessibility() { @@ -72,6 +73,7 @@ bool QWindowsUiaAccessibility::handleWmGetObject(HWND hwnd, WPARAM wParam, LPARA { // Start handling accessibility internally QGuiApplicationPrivate::platformIntegration()->accessibility()->setActive(true); + m_accessibleActive = true; // Ignoring all requests while starting up / shutting down if (QCoreApplication::startingUp() || QCoreApplication::closingDown()) @@ -131,6 +133,11 @@ void QWindowsUiaAccessibility::notifyAccessibilityUpdate(QAccessibleEvent *event if (!event) return; + // Ignore events sent before the first UI Automation + // request or while QAccessible is being activated. + if (!m_accessibleActive) + return; + switch (event->type()) { case QAccessible::PopupMenuStart: playSystemSound(QStringLiteral("MenuPopup")); diff --git a/src/plugins/platforms/windows/uiautomation/qwindowsuiaaccessibility.h b/src/plugins/platforms/windows/uiautomation/qwindowsuiaaccessibility.h index 48b4f9fa6a..ac01a51e76 100644 --- a/src/plugins/platforms/windows/uiautomation/qwindowsuiaaccessibility.h +++ b/src/plugins/platforms/windows/uiautomation/qwindowsuiaaccessibility.h @@ -56,6 +56,8 @@ public: virtual ~QWindowsUiaAccessibility(); static bool handleWmGetObject(HWND hwnd, WPARAM wParam, LPARAM lParam, LRESULT *lResult); void notifyAccessibilityUpdate(QAccessibleEvent *event) override; +private: + static bool m_accessibleActive; }; QT_END_NAMESPACE |