Re-land: Implement NativeViewAccessibilityWin using AXPlatformNodeWin.

ui/accessibility/platform/ax_platform_node_base.cc

 // Copyright 2014 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 "ui/accessibility/platform/ax_platform_node_base.h"
 
+#include "base/strings/utf_string_conversions.h"
 #include "ui/accessibility/ax_node_data.h"
 #include "ui/accessibility/platform/ax_platform_node_delegate.h"
 
 namespace ui {
 
-AXPlatformNodeBase::AXPlatformNodeBase() {
-}
-
-AXPlatformNodeBase::~AXPlatformNodeBase() {
-}
+namespace {
+
+// Predicate that returns true if the first value of a pair is |first|.
+template<typename FirstType, typename SecondType>
+struct FirstIs {
+  FirstIs(FirstType first)
+      : first_(first) {}
+  bool operator()(std::pair<FirstType, SecondType> const& p) {
+    return p.first == first_;
+  }
+  FirstType first_;
+};
+
+// Helper function that finds in a vector of pairs by matching on the
+// first value, and returns an iterator.
+template<typename FirstType, typename SecondType>
+typename std::vector<std::pair<FirstType, SecondType>>::const_iterator
+    FindInVectorOfPairs(
+        FirstType first,
+        const std::vector<std::pair<FirstType, SecondType>>& vector) {
+  return std::find_if(vector.begin(),
+                      vector.end(),
+                      FirstIs<FirstType, SecondType>(first));
+}
+
+}  // namespace
 
 void AXPlatformNodeBase::Init(AXPlatformNodeDelegate* delegate) {
   delegate_ = delegate;
 }
 
-AXRole AXPlatformNodeBase::GetRole() const {
-  return delegate_ ? delegate_->GetData()->role : AX_ROLE_UNKNOWN;
+const AXNodeData& AXPlatformNodeBase::GetData() const {
+  CHECK(delegate_);
+  CR_DEFINE_STATIC_LOCAL(ui::AXNodeData, empty_data, ());
+  const AXNodeData* data = delegate_->GetData();
+  return data ? *data : empty_data;
 }
 
 gfx::Rect AXPlatformNodeBase::GetBoundsInScreen() const {
-  if (!delegate_)
-    return gfx::Rect();
+  CHECK(delegate_);
   gfx::Rect bounds = delegate_->GetData()->location;
   bounds.Offset(delegate_->GetGlobalCoordinateOffset());
   return bounds;
 }
 
 gfx::NativeViewAccessible AXPlatformNodeBase::GetParent() {
-  return delegate_ ? delegate_->GetParent() : NULL;
+  CHECK(delegate_);
+  return delegate_->GetParent();
 }
 
 int AXPlatformNodeBase::GetChildCount() {
-  return delegate_ ? delegate_->GetChildCount() : 0;
+  CHECK(delegate_);
+  return delegate_->GetChildCount();
 }
 
 gfx::NativeViewAccessible AXPlatformNodeBase::ChildAtIndex(int index) {
-  return delegate_ ? delegate_->ChildAtIndex(index) : NULL;
-}
-
-// AXPlatformNode
+  CHECK(delegate_);
+  return delegate_->ChildAtIndex(index);
+}
+
+int AXPlatformNodeBase::GetIndexInParent() {
+  CHECK(delegate_);
+  return delegate_->GetIndexInParent();
+}
+
+// AXPlatformNode overrides.
 
 void AXPlatformNodeBase::Destroy() {
-  delegate_ = NULL;
+  delegate_ = nullptr;
   delete this;
 }
 
 gfx::NativeViewAccessible AXPlatformNodeBase::GetNativeViewAccessible() {
-  return NULL;
-}
-
+  return nullptr;
+}
+
+// Helpers.
+
+AXPlatformNodeBase* AXPlatformNodeBase::GetPreviousSibling() {
+  CHECK(delegate_);
+  gfx::NativeViewAccessible parent_accessible = GetParent();
+  AXPlatformNodeBase* parent = FromNativeViewAccessible(parent_accessible);
+  if (!parent)
+    return nullptr;
+
+  int previous_index = GetIndexInParent() - 1;
+  if (previous_index >= 0 &&
+      previous_index < parent->GetChildCount()) {
+    return FromNativeViewAccessible(parent->ChildAtIndex(previous_index));
+  }
+  return nullptr;
+}
+
+AXPlatformNodeBase* AXPlatformNodeBase::GetNextSibling() {
+  CHECK(delegate_);
+  gfx::NativeViewAccessible parent_accessible = GetParent();
+  AXPlatformNodeBase* parent = FromNativeViewAccessible(parent_accessible);
+  if (!parent)
+    return nullptr;
+
+  int next_index = GetIndexInParent() + 1;
+  if (next_index >= 0 && next_index < parent->GetChildCount())
+    return FromNativeViewAccessible(parent->ChildAtIndex(next_index));
+  return nullptr;
+}
+
+bool AXPlatformNodeBase::IsDescendant(AXPlatformNodeBase* node) {
+  CHECK(delegate_);
+  if (!node)
+    return false;
+  if (node == this)
+    return true;
+  AXPlatformNodeBase* parent = FromNativeViewAccessible(node->GetParent());
+  return IsDescendant(parent);
+}
+
+bool AXPlatformNodeBase::HasBoolAttribute(
+    ui::AXBoolAttribute attribute) const {
+  CHECK(delegate_);
+  const ui::AXNodeData& data = GetData();
+  auto iter = FindInVectorOfPairs(attribute, data.bool_attributes);
+  return iter != data.bool_attributes.end();
+}
+
+bool AXPlatformNodeBase::GetBoolAttribute(
+    ui::AXBoolAttribute attribute) const {
+  CHECK(delegate_);
+  bool result;
+  if (GetBoolAttribute(attribute, &result))
+    return result;
+  return false;
+}
+
+bool AXPlatformNodeBase::GetBoolAttribute(
+    ui::AXBoolAttribute attribute, bool* value) const {
+  CHECK(delegate_);
+  const ui::AXNodeData& data = GetData();
+  auto iter = FindInVectorOfPairs(attribute, data.bool_attributes);
+  if (iter != data.bool_attributes.end()) {
+    *value = iter->second;
+    return true;
+  }
+
+  return false;
+}
+
+bool AXPlatformNodeBase::HasFloatAttribute(
+    ui::AXFloatAttribute attribute) const {
+  CHECK(delegate_);
+  const ui::AXNodeData& data = GetData();
+  auto iter = FindInVectorOfPairs(attribute, data.float_attributes);
+  return iter != data.float_attributes.end();
+}
+
+float AXPlatformNodeBase::GetFloatAttribute(
+    ui::AXFloatAttribute attribute) const {
+  CHECK(delegate_);
+  float result;
+  if (GetFloatAttribute(attribute, &result))
+    return result;
+  return 0.0;
+}
+
+bool AXPlatformNodeBase::GetFloatAttribute(
+    ui::AXFloatAttribute attribute, float* value) const {
+  CHECK(delegate_);
+  const ui::AXNodeData& data = GetData();
+  auto iter = FindInVectorOfPairs(attribute, data.float_attributes);
+  if (iter != data.float_attributes.end()) {
+    *value = iter->second;
+    return true;
+  }
+
+  return false;
+}
+
+bool AXPlatformNodeBase::HasIntAttribute(
+    ui::AXIntAttribute attribute) const {
+  CHECK(delegate_);
+  const ui::AXNodeData& data = GetData();
+  auto iter = FindInVectorOfPairs(attribute, data.int_attributes);
+  return iter != data.int_attributes.end();
+}
+
+int AXPlatformNodeBase::GetIntAttribute(
+    ui::AXIntAttribute attribute) const {
+  CHECK(delegate_);
+  int result;
+  if (GetIntAttribute(attribute, &result))
+    return result;
+  return 0;
+}
+
+bool AXPlatformNodeBase::GetIntAttribute(
+    ui::AXIntAttribute attribute, int* value) const {
+  CHECK(delegate_);
+  const ui::AXNodeData& data = GetData();
+  auto iter = FindInVectorOfPairs(attribute, data.int_attributes);
+  if (iter != data.int_attributes.end()) {
+    *value = iter->second;
+    return true;
+  }
+
+  return false;
+}
+
+bool AXPlatformNodeBase::HasStringAttribute(
+    ui::AXStringAttribute attribute) const {
+  CHECK(delegate_);
+  const ui::AXNodeData& data = GetData();
+  auto iter = FindInVectorOfPairs(attribute, data.string_attributes);
+  return iter != data.string_attributes.end();
+}
+
+const std::string& AXPlatformNodeBase::GetStringAttribute(
+    ui::AXStringAttribute attribute) const {
+  CHECK(delegate_);
+  const ui::AXNodeData& data = GetData();
+  CR_DEFINE_STATIC_LOCAL(std::string, empty_string, ());
+  auto iter = FindInVectorOfPairs(attribute, data.string_attributes);
+  return iter != data.string_attributes.end() ? iter->second : empty_string;
+}
+
+bool AXPlatformNodeBase::GetStringAttribute(
+    ui::AXStringAttribute attribute, std::string* value) const {
+  CHECK(delegate_);
+  const ui::AXNodeData& data = GetData();
+  auto iter = FindInVectorOfPairs(attribute, data.string_attributes);
+  if (iter != data.string_attributes.end()) {
+    *value = iter->second;
+    return true;
+  }
+
+  return false;
+}
+
+base::string16 AXPlatformNodeBase::GetString16Attribute(
+    ui::AXStringAttribute attribute) const {
+  CHECK(delegate_);
+  std::string value_utf8;
+  if (!GetStringAttribute(attribute, &value_utf8))
+    return base::string16();
+  return base::UTF8ToUTF16(value_utf8);
+}
+
+bool AXPlatformNodeBase::GetString16Attribute(
+    ui::AXStringAttribute attribute,
+    base::string16* value) const {
+  CHECK(delegate_);
+  std::string value_utf8;
+  if (!GetStringAttribute(attribute, &value_utf8))
+    return false;
+  *value = base::UTF8ToUTF16(value_utf8);
+  return true;
+}
+
+AXPlatformNodeBase::AXPlatformNodeBase() {
+}
+
+AXPlatformNodeBase::~AXPlatformNodeBase() {
+}
+
+// static
+AXPlatformNodeBase* AXPlatformNodeBase::FromNativeViewAccessible(
+    gfx::NativeViewAccessible accessible) {
+  return static_cast<AXPlatformNodeBase*>(
+      AXPlatformNode::FromNativeViewAccessible(accessible));
+}
 
 }  // namespace ui