mojo/services/html_viewer/ax_provider_impl.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "mojo/services/html_viewer/ax_provider_impl.h"
   6
   7 #include "mojo/services/html_viewer/blink_basic_type_converters.h"
   8 #include "third_party/WebKit/public/platform/WebURL.h"
   9 #include "third_party/WebKit/public/web/WebAXObject.h"
  10 #include "third_party/WebKit/public/web/WebSettings.h"
  11 #include "third_party/WebKit/public/web/WebView.h"
  12
  13 using blink::WebAXObject;
  14 using blink::WebURL;
  15 using blink::WebView;
  16
  17 namespace mojo {
  18
  19 AxProviderImpl::AxProviderImpl(WebView* web_view) : web_view_(web_view) {
  20 }
  21
  22 void AxProviderImpl::GetTree(
  23     const Callback<void(Array<AxNodePtr> nodes)>& callback) {
  24   web_view_->settings()->setAccessibilityEnabled(true);
  25   web_view_->settings()->setInlineTextBoxAccessibilityEnabled(true);
  26
  27   Array<AxNodePtr> result;
  28   Populate(web_view_->accessibilityObject(), 0, 0, &result);
  29   callback.Run(result.Pass());
  30 }
  31
  32 int AxProviderImpl::Populate(const WebAXObject& ax_object,
  33                              int parent_id,
  34                              int next_sibling_id,
  35                              Array<AxNodePtr>* result) {
  36   AxNodePtr ax_node(ConvertAxNode(ax_object, parent_id, next_sibling_id));
  37   int ax_node_id = ax_node->id;
  38   if (ax_node.is_null())
  39     return 0;
  40
  41   result->push_back(ax_node.Pass());
  42
  43   unsigned num_children = ax_object.childCount();
  44   next_sibling_id = 0;
  45   for (unsigned i = 0; i < num_children; ++i) {
  46     int new_id = Populate(ax_object.childAt(num_children - i - 1),
  47                           ax_node_id,
  48                           next_sibling_id,
  49                           result);
  50     if (new_id != 0)
  51       next_sibling_id = new_id;
  52   }
  53
  54   return ax_node_id;
  55 }
  56
  57 AxNodePtr AxProviderImpl::ConvertAxNode(const WebAXObject& ax_object,
  58                                         int parent_id,
  59                                         int next_sibling_id) {
  60   AxNodePtr result;
  61   if (!const_cast<WebAXObject&>(ax_object).updateLayoutAndCheckValidity())
  62     return result.Pass();
  63
  64   result = AxNode::New();
  65   result->id = static_cast<int>(ax_object.axID());
  66   result->parent_id = parent_id;
  67   result->next_sibling_id = next_sibling_id;
  68   result->bounds = Rect::From(ax_object.boundingBoxRect());
  69
  70   if (ax_object.isAnchor()) {
  71     result->link = AxLink::New();
  72     result->link->url = String::From(ax_object.url().string());
  73   } else if (ax_object.childCount() == 0 &&
  74              !ax_object.stringValue().isEmpty()) {
  75     result->text = AxText::New();
  76     result->text->content = String::From(ax_object.stringValue());
  77   }
  78
  79   return result.Pass();
  80 }
  81
  82 }  // namespace mojo