Bug 1668100 - Make target root for AXUIElementsForSearchPredicate. r=morgan

Instead of having the web area be the implicit root, the search results should
exclusively be descendants of the target element that the search is called on.

Differential Revision: https://phabricator.services.mozilla.com/D91826

accessible/mac/MOXSearchInfo.h

@@ -13,7 +13,7 @@ using namespace mozilla::a11y;
 @interface MOXSearchInfo : NSObject {
   // The MOX accessible of the web area, we need a reference
   // to set the pivot's root. This is a weak ref.
-  MOXWebAreaAccessible* mWebArea;
+  MOXAccessibleBase* mRoot;
 
   // The MOX accessible we should start searching from.
   // This is a weak ref.
@@ -32,8 +32,7 @@ using namespace mozilla::a11y;
   BOOL mImmediateDescendantsOnly;
 }
 
-- (id)initWithParameters:(NSDictionary*)params
-                 andRoot:(MOXWebAreaAccessible*)root;
+- (id)initWithParameters:(NSDictionary*)params andRoot:(MOXAccessibleBase*)root;
 
 - (NSArray*)performSearch;
 

accessible/mac/MOXSearchInfo.mm

@@ -17,13 +17,15 @@ using namespace mozilla::a11y;
 @interface MOXSearchInfo ()
 - (NSMutableArray*)getMatchesForRule:(PivotRule&)rule;
 
+- (AccessibleOrProxy)rootGeckoAccessible;
+
 - (AccessibleOrProxy)startGeckoAccessible;
 @end
 
 @implementation MOXSearchInfo
 
 - (id)initWithParameters:(NSDictionary*)params
-                 andRoot:(MOXWebAreaAccessible*)root {
+                 andRoot:(MOXAccessibleBase*)root {
   if (id searchKeyParam = [params objectForKey:@"AXSearchKey"]) {
     mSearchKeys = [searchKeyParam isKindOfClass:[NSString class]]
                       ? @[ searchKeyParam ]
@@ -36,7 +38,7 @@ using namespace mozilla::a11y;
     mStartElem = root;
   }
 
-  mWebArea = root;
+  mRoot = root;
 
   mResultLimit = [[params objectForKey:@"AXResultsLimit"] intValue];
 
@@ -49,6 +51,15 @@ using namespace mozilla::a11y;
   return [super init];
 }
 
+- (AccessibleOrProxy)rootGeckoAccessible {
+  id root =
+      [mRoot isKindOfClass:[mozAccessible class]] ? mRoot : [mRoot moxParent];
+
+  MOZ_ASSERT([mRoot isKindOfClass:[mozAccessible class]]);
+
+  return [static_cast<mozAccessible*>(root) geckoAccessible];
+}
+
 - (AccessibleOrProxy)startGeckoAccessible {
   if ([mStartElem isKindOfClass:[mozAccessible class]]) {
     return [static_cast<mozAccessible*>(mStartElem) geckoAccessible];
@@ -57,14 +68,15 @@ using namespace mozilla::a11y;
   // If it isn't a mozAccessible, it doesn't have a gecko accessible
   // this is most likely the root group. Use the gecko doc as the start
   // accessible.
-  return [mWebArea geckoAccessible];
+  return [self rootGeckoAccessible];
 }
 
 - (NSMutableArray*)getMatchesForRule:(PivotRule&)rule {
   int resultLimit = mResultLimit;
   NSMutableArray* matches = [[NSMutableArray alloc] init];
-  Pivot p = Pivot([mWebArea geckoAccessible]);
+  AccessibleOrProxy geckoRootAcc = [self rootGeckoAccessible];
   AccessibleOrProxy geckoStartAcc = [self startGeckoAccessible];
+  Pivot p = Pivot(geckoRootAcc);
   AccessibleOrProxy match = mSearchForward ? p.Next(geckoStartAcc, rule)
                                            : p.Prev(geckoStartAcc, rule);
   while (!match.IsNull() && resultLimit != 0) {

accessible/mac/mozAccessible.mm

@@ -751,11 +751,8 @@ struct RoleDescrComparator {
   // params. The init function does additional parsing. We pass a
   // reference to the web area to use as a start element if one is not
   // specified.
-  MOXWebAreaAccessible* webArea = static_cast<MOXWebAreaAccessible*>(
-      GetNativeFromGeckoAccessible([self geckoDocument]));
   MOXSearchInfo* search =
-      [[MOXSearchInfo alloc] initWithParameters:searchPredicate
-                                        andRoot:webArea];
+      [[MOXSearchInfo alloc] initWithParameters:searchPredicate andRoot:self];
 
   return [search performSearch];
 }

accessible/tests/browser/mac/browser_rotor.js

@@ -1343,3 +1343,25 @@ addAccessibleTask(
     // );
   }
 );
+
+/**
+ * Test search with non-webarea root
+ */
+addAccessibleTask(
+  `<div id="searchroot"><p>hello</p><p>world</p></div><div><p>goodybe</p></div>`,
+  async (browser, accDoc) => {
+    let searchPred = {
+      AXSearchKey: "AXAnyTypeSearchKey",
+      AXImmediateDescendantsOnly: 1,
+      AXResultsLimit: -1,
+      AXDirection: "AXDirectionNext",
+    };
+
+    const searchRoot = getNativeInterface(accDoc, "searchroot");
+    const resultCount = searchRoot.getParameterizedAttributeValue(
+      "AXUIElementCountForSearchPredicate",
+      NSDictionary(searchPred)
+    );
+    is(resultCount, 2, "Found 2 items");
+  }
+);