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39 
40 #include "accessibility_activation_observer.h"
41 
42 #if QT_CONFIG(accessibility)
43 
44 #include "content/browser/accessibility/browser_accessibility_state_impl.h"
45 
46 namespace QtWebEngineCore {
47 
48 namespace {
49 
isAccessibilityEnabled()50 bool isAccessibilityEnabled() {
51     // On Linux accessibility is disabled by default due to performance issues,
52     // and can be re-enabled by setting the QTWEBENGINE_ENABLE_LINUX_ACCESSIBILITY environment
53     // variable. For details, see QTBUG-59922.
54 #ifdef Q_OS_LINUX
55     static bool accessibility_enabled
56             = qEnvironmentVariableIsSet("QTWEBENGINE_ENABLE_LINUX_ACCESSIBILITY");
57 #else
58     const bool accessibility_enabled = true;
59 #endif
60     return accessibility_enabled;
61 }
62 
63 } // namespace
64 
AccessibilityActivationObserver()65 AccessibilityActivationObserver::AccessibilityActivationObserver()
66 {
67     if (isAccessibilityEnabled()) {
68         QAccessible::installActivationObserver(this);
69         if (QAccessible::isActive())
70             content::BrowserAccessibilityStateImpl::GetInstance()->EnableAccessibility();
71     }
72 }
73 
~AccessibilityActivationObserver()74 AccessibilityActivationObserver::~AccessibilityActivationObserver()
75 {
76     QAccessible::removeActivationObserver(this);
77 }
78 
accessibilityActiveChanged(bool active)79 void AccessibilityActivationObserver::accessibilityActiveChanged(bool active)
80 {
81     if (active)
82         content::BrowserAccessibilityStateImpl::GetInstance()->EnableAccessibility();
83     else
84         content::BrowserAccessibilityStateImpl::GetInstance()->DisableAccessibility();
85 }
86 
87 } // namespace QtWebEngineCore
88 
89 #endif // QT_CONFIG(accessibility)
90