1 files changed, 50 insertions, 0 deletions
diff --git a/src/core/accessibility_activation_observer.cpp b/src/core/accessibility_activation_observer.cpp
new file mode 100644
index 000000000..4f25a35ff
--- /dev/null
+++ b/src/core/accessibility_activation_observer.cpp
@@ -0,0 +1,50 @@
+// Copyright (C) 2018 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+#include "accessibility_activation_observer.h"
+
+#include "content/browser/accessibility/browser_accessibility_state_impl.h"
+
+namespace QtWebEngineCore {
+
+namespace {
+
+bool isAccessibilityEnabled() {
+    // On Linux accessibility can be disabled due to performance issues by setting the
+    // QTWEBENGINE_ENABLE_LINUX_ACCESSIBILITY environment variable to 0. For details,
+    // see QTBUG-59922.
+#ifdef Q_OS_LINUX
+    static bool accessibility_enabled
+            = qEnvironmentVariable("QTWEBENGINE_ENABLE_LINUX_ACCESSIBILITY", QLatin1String("1"))
+                == QLatin1String("1");
+#else
+    const bool accessibility_enabled = true;
+#endif
+    return accessibility_enabled;
+}
+
+} // namespace
+
+AccessibilityActivationObserver::AccessibilityActivationObserver()
+{
+    if (isAccessibilityEnabled()) {
+        QAccessible::installActivationObserver(this);
+        if (QAccessible::isActive())
+            content::BrowserAccessibilityStateImpl::GetInstance()->EnableAccessibility();
+    }
+}
+
+AccessibilityActivationObserver::~AccessibilityActivationObserver()
+{
+    QAccessible::removeActivationObserver(this);
+}
+
+void AccessibilityActivationObserver::accessibilityActiveChanged(bool active)
+{
+    if (active)
+        content::BrowserAccessibilityStateImpl::GetInstance()->EnableAccessibility();
+    else
+        content::BrowserAccessibilityStateImpl::GetInstance()->DisableAccessibility();
+}
+
+} // namespace QtWebEngineCore