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, 7 insertions, 3 deletions

diff --git a/src/quick/items/qquickitem.cpp b/src/quick/items/qquickitem.cpp
index 2340da9b9f..b23ff68abd 100644
--- a/src/quick/items/qquickitem.cpp
+++ b/src/quick/items/qquickitem.cpp
@@ -3129,8 +3129,12 @@ void QQuickItem::inputMethodEvent(QInputMethodEvent *event)
 void QQuickItem::focusInEvent(QFocusEvent * /*event*/)
 {
 #ifndef QT_NO_ACCESSIBILITY
-    QAccessibleEvent ev(this, QAccessible::Focus);
-    QAccessible::updateAccessibility(&ev);
+    if (QAccessible::isActive()) {
+        if (QObject *acc = QQuickAccessibleAttached::findAccessible(this)) {
+            QAccessibleEvent ev(acc, QAccessible::Focus);
+            QAccessible::updateAccessibility(&ev);
+        }
+    }
 #endif
 }
 
@@ -5274,7 +5278,7 @@ void QQuickItem::setFlags(Flags flags)
         }
     }
 
-    if ((flags & ItemClipsChildrenToShape ) != (d->flags & ItemClipsChildrenToShape))
+    if ((flags & ItemClipsChildrenToShape) != (d->flags & ItemClipsChildrenToShape))
         d->dirty(QQuickItemPrivate::Clip);
 
     d->flags = flags;