Accessibility: Improve interface handling in Quick

This changes how interfaces are handled:
the QAccessibleQuickItem will simply subclass
all interfaces and dynamically return 0 or the
appropriate interface_cast.

This makes our implementation a lot more flexible.
To make use of the value interface, only a value
property is needed (together with a corresponding role).

Since the implementation of the interfaces became simpler,
the value interface and some text interface improvements
go along with the change.

Change-Id: I003ec3016d48d730a4acac467bce322167842f4d
Reviewed-by: Jan Arve Sæther <jan-arve.saether@digia.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/src/quick/items/qquickaccessibleattached_p.h b/src/quick/items/qquickaccessibleattached_p.h
index 74f486ae7d..a11f40c535 100644
--- a/src/quick/items/qquickaccessibleattached_p.h
+++ b/src/quick/items/qquickaccessibleattached_p.h
@@ -127,6 +127,18 @@ public:
         return obj->setProperty(propertyName, value);
     }
 
+    static QObject *findAccessible(QObject *object, QAccessible::Role role = QAccessible::NoRole)
+    {
+        while (object) {
+            QObject *att = QQuickAccessibleAttached::attachedProperties(object);
+            if (att && (role == QAccessible::NoRole || att->property("role").toInt() == role)) {
+                break;
+            }
+            object = object->parent();
+        }
+        return object;
+    }
+
 
 Q_SIGNALS:
     void roleChanged();