Re-land: Implement NativeViewAccessibilityWin using AXPlatformNodeWin.

ui/accessibility/platform/test_ax_node_wrapper.cc

+// Copyright 2015 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 "base/containers/hash_tables.h"
+#include "ui/accessibility/platform/test_ax_node_wrapper.h"
+
+namespace ui {
+
+namespace {
+
+// A global map from AXNodes to TestAXNodeWrappers.
+base::hash_map<AXNode*, TestAXNodeWrapper*> g_node_to_wrapper_map;
+
+// A global coordinate offset.
+gfx::Vector2d g_offset;
+
+// A simple implementation of AXTreeDelegate to catch when AXNodes are
+// deleted so we can delete their wrappers.
+class TestAXTreeDelegate : public AXTreeDelegate {
+  void OnNodeWillBeDeleted(AXNode* node) override {
+    auto iter = g_node_to_wrapper_map.find(node);
+    if (iter != g_node_to_wrapper_map.end()) {
+      TestAXNodeWrapper* wrapper = iter->second;
+      delete wrapper;
+      g_node_to_wrapper_map.erase(iter->first);
+    }
+  }
+  void OnSubtreeWillBeDeleted(AXNode* node) override {}
+  void OnNodeCreated(AXNode* node) override {}
+  void OnNodeChanged(AXNode* node) override {}
+  void OnAtomicUpdateFinished(bool root_changed,
+                              const std::vector<Change>& changes) override {}
+};
+
+TestAXTreeDelegate g_ax_tree_delegate;
+
+}  // namespace
+
+// static
+TestAXNodeWrapper* TestAXNodeWrapper::GetOrCreate(AXTree* tree, AXNode* node) {
+  // Just return NULL if |node| is NULL; this makes test code simpler because
+  // now we don't have to null-check AXNode* every time we call GetOrCreate.
+  if (!node)
+    return nullptr;
+
+  tree->SetDelegate(&g_ax_tree_delegate);
+  auto iter = g_node_to_wrapper_map.find(node);
+  if (iter != g_node_to_wrapper_map.end())
+    return iter->second;
+  TestAXNodeWrapper* wrapper = new TestAXNodeWrapper(tree, node);
+  g_node_to_wrapper_map[node] = wrapper;
+  return wrapper;
+}
+
+// static
+void TestAXNodeWrapper::SetGlobalCoordinateOffset(const gfx::Vector2d& offset) {
+  g_offset = offset;
+}
+
+TestAXNodeWrapper::~TestAXNodeWrapper() {
+  platform_node_->Destroy();
+}
+
+const AXNodeData* TestAXNodeWrapper::GetData() {
+  return &node_->data();
+}
+
+gfx::NativeViewAccessible TestAXNodeWrapper::GetParent() {
+  TestAXNodeWrapper* parent_wrapper = GetOrCreate(tree_, node_->parent());
+  return parent_wrapper ?
+      parent_wrapper->ax_platform_node()->GetNativeViewAccessible() :
+      nullptr;
+}
+
+int TestAXNodeWrapper::GetChildCount() {
+  return node_->child_count();
+}
+
+gfx::NativeViewAccessible TestAXNodeWrapper::ChildAtIndex(int index) {
+  CHECK_GE(index, 0);
+  CHECK_LT(index, GetChildCount());
+  TestAXNodeWrapper* child_wrapper =
+      GetOrCreate(tree_, node_->children()[index]);
+  return child_wrapper ?
+      child_wrapper->ax_platform_node()->GetNativeViewAccessible() :
+      nullptr;
+}
+
+int TestAXNodeWrapper::GetIndexInParent() {
+  return node_->index_in_parent();
+}
+
+gfx::Vector2d TestAXNodeWrapper::GetGlobalCoordinateOffset() {
+  return g_offset;
+}
+
+gfx::NativeViewAccessible TestAXNodeWrapper::HitTestSync(int x, int y) {
+  return nullptr;
+}
+
+gfx::NativeViewAccessible TestAXNodeWrapper::GetFocus() {
+  return nullptr;
+}
+
+gfx::AcceleratedWidget
+TestAXNodeWrapper::GetTargetForNativeAccessibilityEvent() {
+  return gfx::kNullAcceleratedWidget;
+}
+
+void TestAXNodeWrapper::DoDefaultAction() {
+}
+
+bool TestAXNodeWrapper::SetStringValue(const base::string16& new_value) {
+  return false;
+}
+
+TestAXNodeWrapper::TestAXNodeWrapper(AXTree* tree, AXNode* node)
+    : tree_(tree),
+      node_(node),
+      platform_node_(AXPlatformNode::Create(this)) {
+}
+
+}  // namespace ui