On Fri, Jan 1, 2010 at 7:13 PM, Chris Fleizach cfleiz...@apple.com wrote:
I need to have a layout test register a callback with DRT, then have that
callback be called at the appropriate time (in order to test accessibility
notifications)
I can't figure out the right incantations to do so.
I'd like to do something like this in the LayoutTest
var addedNotification = liveRegion.addNotificationListener(ariaCallback);
then have a function in the test like
function ariaCallback(notification) {
// do stuff with notification
}
DRT knows when to call this method, but I'm not sure how.. This is what I
have so far, which does not work.
// The JavaScript callback we'll use when we get a notification
static JSStringRef AXNotificationFunctionCallback = 0;
static void _accessibilityNotificationCallback(id element, NSString*
notification)
{
if (!AXNotificationFunctionCallback)
return;
JSObjectRef function = JSObjectMakeFunction([mainFrame globalContext],
NULL, 0, NULL, AXNotificationFunctionCallback, NULL, 1, NULL);
JSValueRef argument = JSValueMakeString([mainFrame globalContext],
JSStringCreateWithCFString((CFStringRef)notification));
JSObjectCallAsFunction([mainFrame globalContext], function, NULL, 1,
argument, NULL);
}
What you need to do is lookup the function object on the global object. Your
function would look more like:
static void _accessibilityNotificationCallback(id element, NSString*
notification)
{
if (!AXNotificationFunctionCallback)
return;
JSValueRef functionValue = JSObjectGetProperty([mainFrame
globalContext], JSContextGetGlobalObject([mainFrame globalContext]),
AXNotificationFunctionCallback, NULL);
if (!JSValueIsObject(functionValue))
return;
JSObjectRef functionObject = static_castJSObjectRef(functionValue);
JSValueRef argument = JSValueMakeString([mainFrame globalContext],
JSStringCreateWithCFString((CFStringRef)notification));
JSObjectCallAsFunction([mainFrame globalContext], function, NULL, 1,
argument, NULL);
}
(You probably would want to add some more exception checks).
That said, a more javascripty way to do this would be to pass the function
object to liveRegion.addNotificationListener itself. That way, in the test
file, you would have,
liveRegion.addNotificationListener(function(notification) {
// do stuff with notification
});
In the implementation of addNotificationListener, you would save the
function object off instead of saving off the string, and then call it in
_accessibilityNotificationCallback.
-Sam
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