Add accessibility to qml

This consists of two parts:
An attached property for QML items and a plugin for the accessibility framework.

The attached property simply takes care of some properties (name, role)
that are needed in order to expose semantics of the application to
assistive tools.

The plugin exposes the hierarchy of QML items to the
accessibility framework.

Change-Id: I32f5603d0d9549b01b3645b205b710b9801762f7
Reviewed-by: Jan-Arve Sæther <jan-arve.saether@nokia.com>

1 files changed, 153 insertions, 0 deletions

diff --git a/src/quick/items/qquickaccessibleattached_p.h b/src/quick/items/qquickaccessibleattached_p.h
new file mode 100644
index 0000000000..184dc2116d
--- /dev/null
+++ b/src/quick/items/qquickaccessibleattached_p.h
@@ -0,0 +1,153 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtDeclarative module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** 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, Nokia gives you certain additional
+** rights. These rights are described in the Nokia 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.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QQUICKACCESSIBLEATTACHED_H
+#define QQUICKACCESSIBLEATTACHED_H
+
+#include <QtQuick/qquickitem.h>
+
+#include <QtCore/qobject.h>
+#include <QtCore/qstring.h>
+
+#ifndef QT_NO_ACCESSIBILITY
+
+#include <QtGui/qaccessible.h>
+#include <private/qtquickglobal_p.h>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(Declarative)
+
+class Q_QUICK_PRIVATE_EXPORT QQuickAccessibleAttached : public QObject
+{
+    Q_OBJECT
+    Q_PROPERTY(QAccessible::Role role READ role WRITE setRole NOTIFY roleChanged)
+    Q_PROPERTY(QString name READ name WRITE setName NOTIFY nameChanged)
+    Q_PROPERTY(QString description READ description WRITE setDescription NOTIFY descriptionChanged)
+
+public:
+    Q_ENUMS(QAccessible::Role QAccessible::Event QAccessible::State)
+
+    QQuickAccessibleAttached(QObject *parent);
+    ~QQuickAccessibleAttached();
+
+    QAccessible::Role role() const { return m_role; }
+    void setRole(QAccessible::Role role)
+    {
+        if (role != m_role) {
+            m_role = role;
+            emit roleChanged();
+            // There is no way to signify role changes at the moment.
+            // QAccessible::updateAccessibility(parent(), 0, QAccessible::);
+        }
+    }
+    QString name() const { return m_name; }
+    void setName(const QString &name) {
+        if (name != m_name) {
+            m_name = name;
+            emit nameChanged();
+            QAccessible::updateAccessibility(parent(), 0, QAccessible::NameChanged);
+        }
+    }
+
+    QString description() const { return m_description; }
+    void setDescription(const QString &description)
+    {
+        if (m_description != description) {
+            m_description = description;
+            emit descriptionChanged();
+            QAccessible::updateAccessibility(parent(), 0, QAccessible::DescriptionChanged);
+        }
+    }
+
+    // Factory function
+    static QQuickAccessibleAttached *qmlAttachedProperties(QObject *obj);
+
+    // Property getter
+    static QObject *attachedProperties(const QObject *obj)
+    {
+        return qmlAttachedPropertiesObject<QQuickAccessibleAttached>(obj, false);
+    }
+
+    static QVariant property(const QObject *object, const char *propertyName)
+    {
+        if (QObject *attachedObject = QQuickAccessibleAttached::attachedProperties(object))
+            return attachedObject->property(propertyName);
+        return QVariant();
+    }
+
+    static bool setProperty(QObject *object, const char *propertyName, const QVariant &value)
+    {
+        QObject *obj = qmlAttachedPropertiesObject<QQuickAccessibleAttached>(object, true);
+        if (!obj) {
+            qWarning("cannot set property Accessible.%s of QObject %s", propertyName, object->metaObject()->className());
+            return false;
+        }
+        return obj->setProperty(propertyName, value);
+    }
+
+
+Q_SIGNALS:
+    void roleChanged();
+    void nameChanged();
+    void descriptionChanged();
+private:
+    QAccessible::Role m_role;
+    QString m_name;
+    QString m_description;
+
+public:
+    using QObject::property;
+};
+
+
+QT_END_NAMESPACE
+
+QML_DECLARE_TYPE(QQuickAccessibleAttached)
+QML_DECLARE_TYPEINFO(QQuickAccessibleAttached, QML_HAS_ATTACHED_PROPERTIES)
+
+QT_END_HEADER
+
+#endif // QT_NO_ACCESSIBILITY
+
+#endif