[GTK][a11y] Add initial WTR accessibility support when building with ATSPI

[Carlos Garcia Campos]

Add WTR support to run the layout tests.

[Carlos Garcia Campos]

Created attachment 442353 [details]
Patch

[Andres Gonzalez]

(In reply to Carlos Garcia Campos from comment #1)
> Created attachment 442353 [details]
> Patch

--- a/Source/WebKit/WebProcess/InjectedBundle/API/c/WKBundlePage.cpp
+++ a/Source/WebKit/WebProcess/InjectedBundle/API/c/WKBundlePage.cpp
@@ -246,7 +246,11 @@ void* WKAccessibilityRootObject(WKBundlePageRef pageRef)
 #if ENABLE(ACCESSIBILITY)
     if (!pageRef)
         return 0;
-
+
+#if USE(ATSPI)
+    return WebKit::toImpl(pageRef)->accessibilityRootObject().child();
+#endif

Why the root obtained down below doesn't work for ATSPI?

    WebCore::AXCoreObject* root = core.document()->axObjectCache()->rootObject();
    if (!root)
        return 0;
    
    return root->wrapper();

[Andres Gonzalez]

@@ -273,7 +277,11 @@ void* WKAccessibilityFocusedObject(WKBundlePageRef pageRef)
 #if ENABLE(ACCESSIBILITY)
     if (!pageRef)
         return 0;
-
+
+#if USE(ATSPI)
+    return WebKit::toImpl(pageRef)->accessibilityRootObject().focusedObject();
+#endif

Same question here. Why this is not good for ATSPI?

    auto* focusedObject = axObjectCache->focusedUIElementForPage(page);
    if (!focusedObject)
        return 0;
    
    return focusedObject->wrapper();

[Carlos Garcia Campos]

(In reply to Andres Gonzalez from comment #2)
> (In reply to Carlos Garcia Campos from comment #1)
> > Created attachment 442353 [details]
> > Patch
> 
> --- a/Source/WebKit/WebProcess/InjectedBundle/API/c/WKBundlePage.cpp
> +++ a/Source/WebKit/WebProcess/InjectedBundle/API/c/WKBundlePage.cpp
> @@ -246,7 +246,11 @@ void* WKAccessibilityRootObject(WKBundlePageRef pageRef)
>  #if ENABLE(ACCESSIBILITY)
>      if (!pageRef)
>          return 0;
> -
> +
> +#if USE(ATSPI)
> +    return WebKit::toImpl(pageRef)->accessibilityRootObject().child();
> +#endif
> 
> Why the root obtained down below doesn't work for ATSPI?
> 
>     WebCore::AXCoreObject* root =
> core.document()->axObjectCache()->rootObject();
>     if (!root)
>         return 0;
>     
>     return root->wrapper();

In the web process the web page has an accessibility object that is the parent of the root object. In case of ATK that's WebKitWebPageAccessibilityObject, in atspi it's WebCore::AccessibilityRootAtspi. When running layout tests we don't really need a parent for the root object, but in atspi WebCore::AccessibilityRootAtspi contains the AccessibilityAtspi object that implements the communication with atspi service. So, all wrappers expect to have a valid root that they use to talk to atspi service. In case of ATK, when tests are run the web page accessibility object is never connected to the root object wrapper, but in atspi we need to make that connection that happens in AccessibilityRootAtspi::child(). That's why we get the root object wrapper as the child of the web page accessibility object (the root of the tree in the web process).

[Carlos Garcia Campos]

Created attachment 442792 [details]
Patch

[Carlos Garcia Campos]

Created attachment 443386 [details]
Patch

[Adrian Perez]

Comment on attachment 443386 [details]
Patch

There has not been further comments by Andres, and the patch
and clarifications LGTM, so let's try and get this landed :)

[Carlos Garcia Campos]

Committed r285996 (244393@main): <https://commits.webkit.org/244393@main>