One accessibility tree per frame.

content/browser/accessibility/browser_accessibility_manager_android.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/accessibility/browser_accessibility_manager_android.h"
 
 #include <stddef.h>
 
 #include <cmath>
 
@@ skipping 128 matching lines @@
     BrowserAccessibilityDelegate* delegate,
     BrowserAccessibilityFactory* factory)
     : BrowserAccessibilityManager(delegate, factory),
       prune_tree_for_screen_reader_(true) {
   Initialize(initial_tree);
   SetContentViewCore(content_view_core);
 }
 
 BrowserAccessibilityManagerAndroid::~BrowserAccessibilityManagerAndroid() {
   JNIEnv* env = AttachCurrentThread();
-  ScopedJavaLocalRef<jobject> obj = java_ref_.get(env);
+  ScopedJavaLocalRef<jobject> obj = GetJavaRefFromRootManager();
   if (obj.is_null())
     return;
 
   Java_BrowserAccessibilityManager_onNativeObjectDestroyed(env, obj.obj());
 }
 
 // static
 ui::AXTreeUpdate
     BrowserAccessibilityManagerAndroid::GetEmptyDocument() {
   ui::AXNodeData empty_document;
@@ skipping 15 matching lines @@
   java_ref_ = JavaObjectWeakGlobalRef(
       env, Java_BrowserAccessibilityManager_create(
           env, reinterpret_cast<intptr_t>(this),
           content_view_core.obj()).obj());
 }
 
 void BrowserAccessibilityManagerAndroid::NotifyAccessibilityEvent(
     ui::AXEvent event_type,
     BrowserAccessibility* node) {
   JNIEnv* env = AttachCurrentThread();
-  ScopedJavaLocalRef<jobject> obj = java_ref_.get(env);
+  ScopedJavaLocalRef<jobject> obj = GetJavaRefFromRootManager();
   if (obj.is_null())
     return;
 
   BrowserAccessibilityAndroid* android_node =
       static_cast<BrowserAccessibilityAndroid*>(node);
 
   if (event_type == ui::AX_EVENT_HIDE)
     return;
 
   if (event_type == ui::AX_EVENT_TREE_CHANGED)
@@ skipping 72 matching lines @@
   }
 }
 
 void BrowserAccessibilityManagerAndroid::OnLocationChanges(
       const std::vector<AccessibilityHostMsg_LocationChangeParams>& params) {
   // Android is not very efficient at handling notifications, and location
   // changes in particular are frequent and not time-critical. If a lot of
   // nodes changed location, just send a single notification after a short
   // delay (to batch them), rather than lots of individual notifications.
   if (params.size() > 3) {
+    ScopedJavaLocalRef<jobject> obj = GetJavaRefFromRootManager();
     JNIEnv* env = AttachCurrentThread();
-    ScopedJavaLocalRef<jobject> obj = java_ref_.get(env);
     if (obj.is_null())
       return;
     Java_BrowserAccessibilityManager_sendDelayedWindowContentChangedEvent(
         env, obj.obj());
     return;
   }
 
   BrowserAccessibilityManager::OnLocationChanges(params);
 }
 
@@ skipping 362 matching lines @@
     BrowserAccessibilityManager::SetValue(
         *node, base::UTF8ToUTF16(base::DoubleToString(value)));
     return true;
   }
   return false;
 }
 
 void BrowserAccessibilityManagerAndroid::HandleHoverEvent(
     BrowserAccessibility* node) {
   JNIEnv* env = AttachCurrentThread();
-  ScopedJavaLocalRef<jobject> obj = java_ref_.get(env);
+  ScopedJavaLocalRef<jobject> obj = GetJavaRefFromRootManager();
   if (obj.is_null())
     return;
 
   BrowserAccessibilityAndroid* ancestor =
       static_cast<BrowserAccessibilityAndroid*>(node->GetParent());
   while (ancestor && ancestor != GetRoot()) {
     if (ancestor->PlatformIsLeaf() ||
         (ancestor->IsFocusable() && !ancestor->HasFocusableChild())) {
       node = ancestor;
       // Don't break - we want the highest ancestor that's focusable or a
@@ skipping 216 matching lines @@
   if (!node)
     return false;
 
   return node->Scroll(direction);
 }
 
 void BrowserAccessibilityManagerAndroid::OnAtomicUpdateFinished(
     ui::AXTree* tree,
     bool root_changed,
     const std::vector<ui::AXTreeDelegate::Change>& changes) {
+  BrowserAccessibilityManager::OnAtomicUpdateFinished(
+      tree, root_changed, changes);
+
   if (root_changed) {
     JNIEnv* env = AttachCurrentThread();
-    ScopedJavaLocalRef<jobject> obj = java_ref_.get(env);
+    ScopedJavaLocalRef<jobject> obj = GetJavaRefFromRootManager();
     if (obj.is_null())
       return;
 
     Java_BrowserAccessibilityManager_handleNavigate(env, obj.obj());
   }
 }
 
 bool
 BrowserAccessibilityManagerAndroid::UseRootScrollOffsetsWhenComputingBounds() {
   // The Java layer handles the root scroll offset.
   return false;
 }
 
 BrowserAccessibilityAndroid*
 BrowserAccessibilityManagerAndroid::GetFromUniqueID(int32_t unique_id) {
   return static_cast<BrowserAccessibilityAndroid*>(
       BrowserAccessibility::GetFromUniqueID(unique_id));
 }
 
+ScopedJavaLocalRef<jobject>
+BrowserAccessibilityManagerAndroid::GetJavaRefFromRootManager() {
+  BrowserAccessibilityManagerAndroid* root_manager =
+      static_cast<BrowserAccessibilityManagerAndroid*>(
+          GetRootManager());
+  if (!root_manager)
+    return ScopedJavaLocalRef<jobject>();
+
+  JNIEnv* env = AttachCurrentThread();
+  return root_manager->java_ref().get(env);
+}
+
 bool RegisterBrowserAccessibilityManager(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace content