Add core accessibility

This commit adds the basics to bridge the blink
accessibility classes to QAccessibleInterfaces.

Note that it needs two follow up commits to implement the bridging from
the QWidget/Qt Quick worlds.

[ChangeLog][Accessibility] QtWebEngine now has accessibility
support, enabling assistive technology such as screen readers to work
with it.

Change-Id: Ied1d97e61a024115ac7a9245331211f6d9fac1b4
Reviewed-by: Zeno Albisser <zeno.albisser@digia.com>
Reviewed-by: Andras Becsi <andras.becsi@digia.com>

1 files changed, 119 insertions, 0 deletions

diff --git a/src/core/browser_accessibility_manager_qt.cpp b/src/core/browser_accessibility_manager_qt.cpp
new file mode 100644
index 000000000..8c2c3444a
--- /dev/null
+++ b/src/core/browser_accessibility_manager_qt.cpp
@@ -0,0 +1,119 @@
+/****************************************************************************
+**
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** 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 Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/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 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "browser_accessibility_manager_qt.h"
+
+#include "third_party/WebKit/public/web/WebAXEnums.h"
+#include "browser_accessibility_qt.h"
+
+using namespace blink;
+
+namespace content {
+
+BrowserAccessibility *BrowserAccessibilityFactoryQt::Create()
+{
+    return new BrowserAccessibilityQt();
+}
+
+BrowserAccessibilityManagerQt::BrowserAccessibilityManagerQt(
+    QObject* parentObject,
+    const AccessibilityNodeData& src,
+    BrowserAccessibilityDelegate* delegate,
+    BrowserAccessibilityFactory* factory)
+    : BrowserAccessibilityManager(delegate, factory)
+    , m_parentObject(parentObject) {
+    Initialize(src);
+}
+
+QAccessibleInterface *BrowserAccessibilityManagerQt::rootParentAccessible()
+{
+    return QAccessible::queryAccessibleInterface(m_parentObject);
+}
+
+void BrowserAccessibilityManagerQt::NotifyRootChanged()
+{
+}
+
+void BrowserAccessibilityManagerQt::NotifyAccessibilityEvent(blink::WebAXEvent event_type,
+    BrowserAccessibility* node)
+{
+    BrowserAccessibilityQt *iface = static_cast<BrowserAccessibilityQt*>(node);
+
+    switch (event_type) {
+    case WebAXEventFocus: {
+        QAccessibleEvent event(iface, QAccessible::Focus);
+        QAccessible::updateAccessibility(&event);
+        break;
+    }
+    case WebAXEventCheckedStateChanged: {
+        BrowserAccessibilityQt *iface = static_cast<BrowserAccessibilityQt*>(node);
+        QAccessible::State change;
+        change.checked = true;
+        QAccessibleStateChangeEvent event(iface, change);
+        QAccessible::updateAccessibility(&event);
+        break;
+    }
+    case WebAXEventValueChanged: {
+        QVariant value;
+        if (QAccessibleValueInterface *valueIface = iface->valueInterface())
+            value = valueIface->currentValue();
+        QAccessibleValueChangeEvent event(iface, value);
+        QAccessible::updateAccessibility(&event);
+        break;
+    }
+    case WebAXEventChildrenChanged:
+        break;
+    case WebAXEventLayoutComplete:
+        break;
+    case WebAXEventLoadComplete:
+        break;
+    case WebAXEventTextChanged:
+        break;
+    case WebAXEventTextInserted:
+        break;
+    case WebAXEventTextRemoved:
+        break;
+    default:
+        break;
+    }
+}
+
+}