Send voice interaction structure from cros to Arc.

content/public/browser/voice_interaction_helper.cc

+// Copyright 2017 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/public/browser/voice_interaction_helper.h"
+
+#include "content/browser/accessibility/browser_accessibility.h"
+#include "content/browser/web_contents/web_contents_impl.h"
+#include "content/public/browser/web_contents.h"
+#include "ui/accessibility/platform/ax_android_constants.h"
+
+namespace content {
+
+namespace {
+
+std::string GetClassName(BrowserAccessibility* node) {
+  const char* class_name = nullptr;
+
+  switch (node->GetRole()) {
+    case ui::AX_ROLE_SEARCH_BOX:
+    case ui::AX_ROLE_SPIN_BUTTON:
+    case ui::AX_ROLE_TEXT_FIELD:
+      class_name = ui::kAXEditTextClassname;
+      break;
+    case ui::AX_ROLE_SLIDER:
+      class_name = ui::kAXSeekBarClassname;
+      break;
+    case ui::AX_ROLE_COLOR_WELL:
+    case ui::AX_ROLE_COMBO_BOX:
+    case ui::AX_ROLE_DATE:
+    case ui::AX_ROLE_POP_UP_BUTTON:
+    case ui::AX_ROLE_INPUT_TIME:
+      class_name = ui::kAXSpinnerClassname;
+      break;
+    case ui::AX_ROLE_BUTTON:
+    case ui::AX_ROLE_MENU_BUTTON:
+      class_name = ui::kAXButtonClassname;
+      break;
+    case ui::AX_ROLE_CHECK_BOX:
+    case ui::AX_ROLE_SWITCH:
+      class_name = ui::kAXCheckBoxClassname;
+      break;
+    case ui::AX_ROLE_RADIO_BUTTON:
+      class_name = ui::kAXRadioButtonClassname;
+      break;
+    case ui::AX_ROLE_TOGGLE_BUTTON:
+      class_name = ui::kAXToggleButtonClassname;
+      break;
+    case ui::AX_ROLE_CANVAS:
+    case ui::AX_ROLE_IMAGE:
+    case ui::AX_ROLE_SVG_ROOT:
+      class_name = ui::kAXImageClassname;
+      break;
+    case ui::AX_ROLE_METER:
+    case ui::AX_ROLE_PROGRESS_INDICATOR:
+      class_name = ui::kAXProgressBarClassname;
+      break;
+    case ui::AX_ROLE_TAB_LIST:
+      class_name = ui::kAXTabWidgetClassname;
+      break;
+    case ui::AX_ROLE_GRID:
+    case ui::AX_ROLE_TABLE:
+      class_name = ui::kAXGridViewClassname;
+      break;
+    case ui::AX_ROLE_LIST:
+    case ui::AX_ROLE_LIST_BOX:
+    case ui::AX_ROLE_DESCRIPTION_LIST:
+      class_name = ui::kAXListViewClassname;
+      break;
+    case ui::AX_ROLE_DIALOG:
+      class_name = ui::kAXDialogClassname;
+      break;
+    case ui::AX_ROLE_ROOT_WEB_AREA:
+      if (node->PlatformGetParent() == nullptr) {
+        class_name = ui::kAXWebViewClassname;
+      } else {
+        class_name = ui::kAXViewClassname;
+      }
+      break;
+    case ui::AX_ROLE_MENU_ITEM:
+    case ui::AX_ROLE_MENU_ITEM_CHECK_BOX:
+    case ui::AX_ROLE_MENU_ITEM_RADIO:
+      class_name = ui::kAXMenuItemClassname;
+      break;
+    default:
+      class_name = ui::kAXViewClassname;
+      break;
+  }
+
+  return std::string(class_name);
+}
+
+// TODO(muyuanli): refactor code in web_contents_android
+// to use this function as well.
+std::unique_ptr<AXViewStructure> WalkAXTreeDepthFirst(
+    BrowserAccessibility* node,
+    gfx::Rect rect,
+    const ui::AXTreeUpdate& update) {
+  auto result = base::MakeUnique<AXViewStructure>();
+  result->text = node->GetText();
+  result->class_name = GetClassName(node);
+
+  const int text_style = node->GetIntAttribute(ui::AX_ATTR_TEXT_STYLE);
+  result->bold = (text_style & ui::AX_TEXT_STYLE_BOLD) != 0;
+  result->italic = (text_style & ui::AX_TEXT_STYLE_ITALIC) != 0;
+  result->line_through = (text_style & ui::AX_TEXT_STYLE_LINE_THROUGH) != 0;
+  result->underline = (text_style & ui::AX_TEXT_STYLE_ITALIC) != 0;
+
+  result->text_size = node->GetFloatAttribute(ui::AX_ATTR_FONT_SIZE);
+  result->bgcolor = node->GetIntAttribute(ui::AX_ATTR_BACKGROUND_COLOR);
+
+  const gfx::Rect& absolute_rect = node->GetPageBoundsRect();
+  gfx::Rect parent_relative_rect = absolute_rect;
+  bool is_root = node->GetParent() == nullptr;
+  if (!is_root) {
+    parent_relative_rect.Offset(-rect.OffsetFromOrigin());
+  }
+  result->rect = gfx::Rect(parent_relative_rect.x(), parent_relative_rect.y(),
+                           absolute_rect.width(), absolute_rect.height());
+  result->has_selection = false;
+
+  if (node->PlatformIsLeaf()) {
+    int start_selection = 0;
+    int end_selection = 0;
+    if (update.tree_data.sel_anchor_object_id == node->GetId()) {
+      start_selection = update.tree_data.sel_anchor_offset;
+      end_selection = node->GetText().length();
+    }
+    if (update.tree_data.sel_focus_object_id == node->GetId()) {
+      end_selection = update.tree_data.sel_focus_offset;
+    }
+    if (end_selection > 0) {
+      result->has_selection = true;
+      result->start_selection = start_selection;
+      result->end_selection = end_selection;
+    }
+  }
+
+  for (unsigned int i = 0; i < node->PlatformChildCount(); i++) {
+    auto child =
+        WalkAXTreeDepthFirst(node->PlatformGetChild(i), absolute_rect, update);
+    result->children.push_back(std::move(child));
+  }
+
+  return result;
+}
+
+void AXSnapshotCallback(
+    const base::Callback<void(const std::unique_ptr<AXViewStructure>)>&

[xiyuan, 2017/04/03 21:32:11]

"const std::unique_ptr<>" means the callback cannot take over the ownership.
Should you use just "std::unique_ptr<>" ?

[Muyuan, 2017/04/03 23:00:33]

Done.

+        callback,
+    const ui::AXTreeUpdate& ax_tree_update) {
+  auto manager = std::unique_ptr<content::BrowserAccessibilityManager>(
+      content::BrowserAccessibilityManager::Create(ax_tree_update, nullptr));
+  auto structure =

[xiyuan, 2017/04/03 21:32:11]

nit: get rid of |structure| and inline the call

[Muyuan, 2017/04/03 23:00:33]

Done.

+      WalkAXTreeDepthFirst(manager->GetRoot(), gfx::Rect(), ax_tree_update);
+  callback.Run(std::move(structure));
+}
+
+}  // namespace
+
+AXViewStructure::AXViewStructure() {}
+
+AXViewStructure::~AXViewStructure() {}
+
+void GetAXViewStructure(
+    WebContents* web_contents,
+    const base::Callback<void(const std::unique_ptr<AXViewStructure>)>&
+        callback) {
+  WebContentsImpl* web_contents_impl =
+      static_cast<WebContentsImpl*>(web_contents);
+  web_contents_impl->RequestAXTreeSnapshot(
+      base::Bind(&AXSnapshotCallback, callback));
+}
+
+}  // namespace content