Refactor and send voice interaction structure

ui/accessibility/platform/ax_android_snapshot.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 "ui/accessibility/platform/ax_android_snapshot.h"
+
+#include <memory>
+#include <string>
+
+#include "base/logging.h"
+#include "base/memory/ptr_util.h"
+#include "ui/accessibility/ax_enums.h"
+#include "ui/accessibility/ax_node.h"
+#include "ui/accessibility/ax_serializable_tree.h"
+#include "ui/accessibility/platform/ax_android_constants.h"
+#include "ui/gfx/geometry/rect_conversions.h"
+#include "ui/gfx/transform.h"
+
+namespace ui {
+
+namespace {
+
+bool HasFocusableChild(const AXNode* node) {
+  for (auto* child : node->children()) {
+    if ((child->data().state & ui::AX_STATE_FOCUSABLE) != 0 ||
+        HasFocusableChild(child)) {
+      return true;
+    }
+  }
+  return false;
+}
+
+bool IsLeaf(const AXNode* node) {
+  if (node->child_count() == 0)
+    return true;
+
+  if (node->IsTextNode()) {
+    return true;
+  }
+
+  switch (node->data().role) {
+    case ui::AX_ROLE_IMAGE:
+    case ui::AX_ROLE_METER:
+    case ui::AX_ROLE_SCROLL_BAR:
+    case ui::AX_ROLE_SLIDER:
+    case ui::AX_ROLE_SPLITTER:
+    case ui::AX_ROLE_PROGRESS_INDICATOR:
+    case ui::AX_ROLE_DATE:
+    case ui::AX_ROLE_DATE_TIME:
+    case ui::AX_ROLE_INPUT_TIME:
+      return true;
+    default:
+      return false;
+  }
+}
+
+std::unique_ptr<AXSnapshotNodeAndroid> WalkAXTreeDepthFirst(
+    const AXNode* node,
+    gfx::Rect rect,
+    const ui::AXTreeUpdate& update,
+    const AXTree* tree) {
+  auto result = base::MakeUnique<AXSnapshotNodeAndroid>();
+  if (node->IsTextNode())
+    result->text = GetText(node);
+  result->class_name = GetClassName(node);
+
+  result->text_size = -1.0;
+  result->bgcolor = 0;
+  result->color = 0;
+  result->bold = 0;
+  result->italic = 0;
+  result->line_through = 0;
+  result->underline = 0;
+
+  if (node->data().HasFloatAttribute(ui::AX_ATTR_FONT_SIZE)) {
+    gfx::RectF text_size_rect(
+        0, 0, 1, node->data().GetFloatAttribute(ui::AX_ATTR_FONT_SIZE));
+    gfx::Rect scaled_text_size_rect =
+        RelativeToAbsoluteBounds(node, text_size_rect, tree);
+    result->text_size = scaled_text_size_rect.height();
+
+    const int text_style = node->data().GetIntAttribute(ui::AX_ATTR_TEXT_STYLE);
+    result->color = node->data().GetIntAttribute(ui::AX_ATTR_COLOR);
+    result->bgcolor =
+        node->data().GetIntAttribute(ui::AX_ATTR_BACKGROUND_COLOR);
+    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;
+  }
+
+  const gfx::Rect& absolute_rect = GetPageBoundsRect(node, tree);
+  gfx::Rect parent_relative_rect = absolute_rect;
+  bool is_root = node->parent() == 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 (IsLeaf(node)) {
+    int start_selection = 0;
+    int end_selection = 0;
+    if (update.tree_data.sel_anchor_object_id == node->data().id) {
+      start_selection = update.tree_data.sel_anchor_offset;
+      end_selection = GetText(node).length();
+    }
+    if (update.tree_data.sel_focus_object_id == node->data().id) {
+      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 (auto* child : node->children()) {
+    result->children.push_back(
+        WalkAXTreeDepthFirst(child, absolute_rect, update, tree));
+  }
+
+  return result;
+}
+}
+
+AX_EXPORT AXSnapshotNodeAndroid::AXSnapshotNodeAndroid() = default;
+AX_EXPORT AXSnapshotNodeAndroid::~AXSnapshotNodeAndroid() = default;
+
+AX_EXPORT std::unique_ptr<AXSnapshotNodeAndroid> AXSnapshotNodeAndroid::Create(
+    const AXTreeUpdate& update) {
+  auto tree = base::MakeUnique<ui::AXSerializableTree>();
+  if (!tree->Unserialize(update)) {
+    LOG(FATAL) << tree->error();
+  }
+  return WalkAXTreeDepthFirst(tree->root(), gfx::Rect(), update, tree.get());
+}
+
+std::string GetClassName(const AXNode* node) {
+  switch (node->data().role) {
+    case ui::AX_ROLE_SEARCH_BOX:
+    case ui::AX_ROLE_SPIN_BUTTON:
+    case ui::AX_ROLE_TEXT_FIELD:
+      return ui::kAXEditTextClassname;
+    case ui::AX_ROLE_SLIDER:
+      return ui::kAXSeekBarClassname;
+    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:
+      return ui::kAXSpinnerClassname;
+    case ui::AX_ROLE_BUTTON:
+    case ui::AX_ROLE_MENU_BUTTON:
+      return ui::kAXButtonClassname;
+    case ui::AX_ROLE_CHECK_BOX:
+    case ui::AX_ROLE_SWITCH:
+      return ui::kAXCheckBoxClassname;
+    case ui::AX_ROLE_RADIO_BUTTON:
+      return ui::kAXRadioButtonClassname;
+    case ui::AX_ROLE_TOGGLE_BUTTON:
+      return ui::kAXToggleButtonClassname;
+    case ui::AX_ROLE_CANVAS:
+    case ui::AX_ROLE_IMAGE:
+    case ui::AX_ROLE_SVG_ROOT:
+      return ui::kAXImageClassname;
+    case ui::AX_ROLE_METER:
+    case ui::AX_ROLE_PROGRESS_INDICATOR:
+      return ui::kAXProgressBarClassname;
+    case ui::AX_ROLE_TAB_LIST:
+      return ui::kAXTabWidgetClassname;
+    case ui::AX_ROLE_GRID:
+    case ui::AX_ROLE_TABLE:
+      return ui::kAXGridViewClassname;
+    case ui::AX_ROLE_LIST:
+    case ui::AX_ROLE_LIST_BOX:
+    case ui::AX_ROLE_DESCRIPTION_LIST:
+      return ui::kAXListViewClassname;
+    case ui::AX_ROLE_DIALOG:
+      return ui::kAXDialogClassname;
+    case ui::AX_ROLE_ROOT_WEB_AREA:
+      return node->parent() == nullptr ? ui::kAXWebViewClassname
+                                       : ui::kAXViewClassname;
+    case ui::AX_ROLE_MENU_ITEM:
+    case ui::AX_ROLE_MENU_ITEM_CHECK_BOX:
+    case ui::AX_ROLE_MENU_ITEM_RADIO:
+      return ui::kAXMenuItemClassname;
+    default:
+      return ui::kAXViewClassname;
+  }
+}
+
+base::string16 GetText(const AXNode* node) {
+  if (node->IsTextNode()) {
+    return node->data().GetString16Attribute(ui::AX_ATTR_NAME);
+  }
+  base::string16 text;
+  for (auto* child : node->children()) {
+    text += GetText(child);
+  }
+  return text;
+}
+
+gfx::Rect GetPageBoundsRect(const AXNode* node, const AXTree* tree) {
+  gfx::RectF bounds = node->data().location;
+  FixEmptyBounds(node, &bounds, tree);
+  return RelativeToAbsoluteBounds(node, bounds, tree);
+}
+
+void FixEmptyBounds(const AXNode* node,
+                    gfx::RectF* bounds,
+                    const AXTree* tree) {
+  if (bounds->width() > 0 && bounds->height() > 0)
+    return;
+  for (auto* child : node->children()) {
+    gfx::Rect child_bounds = GetPageBoundsRect(child, tree);
+    if (child_bounds.width() == 0 || child_bounds.height() == 0)
+      continue;
+    if (bounds->width() == 0 || bounds->height() == 0) {
+      *bounds = gfx::RectF(child_bounds);
+      continue;
+    }
+    bounds->Union(gfx::RectF(child_bounds));
+  }
+}
+
+gfx::Rect RelativeToAbsoluteBounds(const AXNode* node,
+                                   gfx::RectF bounds,
+                                   const AXTree* tree) {
+  const AXNode* current = node;
+  while (current != nullptr) {
+    if (current->data().transform)
+      current->data().transform->TransformRect(&bounds);
+    auto* container = tree->GetFromId(current->data().offset_container_id);
+    if (!container) {
+      if (current == tree->root())
+        container = current->parent();
+      else
+        container = tree->root();
+    }
+    if (!container || container == current)
+      break;
+
+    gfx::RectF container_bounds = container->data().location;
+    bounds.Offset(container_bounds.x(), container_bounds.y());
+    current = container;
+  }
+  return gfx::ToEnclosingRect(bounds);
+}
+
+}  // namespace ui