Create a value interface for qml accessibles.

Change-Id: I472052c6d61a3a32033544ebb5afc5b11fb093e2
Reviewed-by: Jan-Arve Sæther <jan-arve.saether@nokia.com>

src/plugins/accessible/quick/main.cpp

@@ -46,6 +46,7 @@
 
 #include <QtQuick/QQuickView>
 #include <QtQuick/QQuickItem>
+#include <QtQuick/private/qquickaccessibleattached_p.h>
 
 #include <qaccessibleplugin.h>
 #include <qvariant.h>
@@ -82,9 +83,23 @@ QAccessibleInterface *AccessibleQuickFactory::create(const QString &classname, Q
     if (classname == QLatin1String("QQuickView")) {
         return new QAccessibleQuickView(qobject_cast<QQuickView *>(object)); // FIXME
     } else if (classname == QLatin1String("QQuickItem")) {
-            QQuickItem * item = qobject_cast<QQuickItem *>(object);
-            Q_ASSERT(item);
+        QQuickItem * item = qobject_cast<QQuickItem *>(object);
+        Q_ASSERT(item);
+
+        QVariant v = QQuickAccessibleAttached::property(item, "role");
+        bool ok;
+        QAccessible::Role role = (QAccessible::Role)v.toInt(&ok);
+        if (!ok)    // Not sure if this check is needed.
+            return new QAccessibleQuickItem(item);
+
+        switch (role) {
+        case QAccessible::Slider:
+        case QAccessible::SpinBox:
+        case QAccessible::Dial:
+            return new QAccessibleQuickItemValueInterface(item);
+        default:
             return new QAccessibleQuickItem(item);
+        }
     }
 
     return 0;

src/plugins/accessible/quick/qaccessiblequickitem.cpp

@@ -251,8 +251,35 @@ QString QAccessibleQuickItem::text(QAccessible::Text textType) const
         }
     }
 
-
     return QString();
 }
 
+void *QAccessibleQuickItemValueInterface::interface_cast(QAccessible::InterfaceType t)
+{
+    if (t == QAccessible::ValueInterface)
+       return static_cast<QAccessibleValueInterface*>(this);
+    return QAccessibleQuickItem::interface_cast(t);
+}
+
+QVariant QAccessibleQuickItemValueInterface::currentValue()
+{
+    return m_item->property("value");
+}
+
+void QAccessibleQuickItemValueInterface::setCurrentValue(const QVariant &value)
+{
+    m_item->setProperty("value", value);
+}
+
+QVariant QAccessibleQuickItemValueInterface::maximumValue()
+{
+    return m_item->property("maximumValue");
+}
+
+QVariant QAccessibleQuickItemValueInterface::minimumValue()
+{
+    return m_item->property("minimumValue");
+}
+
+
 QT_END_NAMESPACE

src/plugins/accessible/quick/qaccessiblequickitem.h

@@ -72,10 +72,25 @@ class QAccessibleQuickItem : public QDeclarativeAccessible
     QString text(QAccessible::Text) const;
 
     bool isAccessible() const;
-private:
+
+protected:
    QQuickItem *m_item;
 };
 
+class QAccessibleQuickItemValueInterface: public QAccessibleQuickItem, public QAccessibleValueInterface
+{
+public:
+    QAccessibleQuickItemValueInterface(QQuickItem *item) : QAccessibleQuickItem(item)
+    {}
+
+    void *interface_cast(QAccessible::InterfaceType t);
+
+    QVariant currentValue();
+    void setCurrentValue(const QVariant &value);
+    QVariant maximumValue();
+    QVariant minimumValue();
+};
+
 #endif // QT_NO_ACCESSIBILITY
 
 QT_END_NAMESPACE