Make AccessiblityActivationObserver separate of RWHV

It is a global control anyway, and with future Chromium headers, there
are conflicts with qaccessibility.h.

Change-Id: Ife43340684b8b9498b1f4cd3f6fbe450d88794ec
Reviewed-by: Peter Varga <pvarga@inf.u-szeged.hu>

1 files changed, 89 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..75ad90c54
--- /dev/null
+++ b/src/core/accessibility_activation_observer.cpp
@@ -0,0 +1,89 @@
+/****************************************************************************
+**
+** Copyright (C) 2018 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtWebEngine module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "accessibility_activation_observer.h"
+
+#ifndef QT_NO_ACCESSIBILITY
+
+#include "content/browser/accessibility/browser_accessibility_state_impl.h"
+
+namespace QtWebEngineCore {
+
+namespace {
+
+bool isAccessibilityEnabled() {
+    // On Linux accessibility is disabled by default due to performance issues,
+    // and can be re-enabled by setting the QTWEBENGINE_ENABLE_LINUX_ACCESSIBILITY environment
+    // variable. For details, see QTBUG-59922.
+#ifdef Q_OS_LINUX
+    static bool accessibility_enabled
+            = qEnvironmentVariableIsSet("QTWEBENGINE_ENABLE_LINUX_ACCESSIBILITY");
+#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
+
+#endif  // QT_NO_ACCESSIBILITY