src/content/browser/accessibility/accessibility_win_browsertest.cc

   1 // Copyright (c) 2012 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 <vector>
   6
   7 #include "base/memory/scoped_ptr.h"
   8 #include "base/strings/utf_string_conversions.h"
   9 #include "base/win/scoped_bstr.h"
  10 #include "base/win/scoped_comptr.h"
  11 #include "base/win/scoped_variant.h"
  12 #include "content/browser/accessibility/accessibility_tree_formatter_utils_win.h"
  13 #include "content/browser/renderer_host/render_view_host_impl.h"
  14 #include "content/public/browser/notification_service.h"
  15 #include "content/public/browser/notification_types.h"
  16 #include "content/public/browser/render_frame_host.h"
  17 #include "content/public/browser/render_widget_host_view.h"
  18 #include "content/public/browser/web_contents.h"
  19 #include "content/public/common/url_constants.h"
  20 #include "content/public/test/content_browser_test.h"
  21 #include "content/public/test/content_browser_test_utils.h"
  22 #include "content/shell/browser/shell.h"
  23 #include "content/test/accessibility_browser_test_utils.h"
  24 #include "third_party/iaccessible2/ia2_api_all.h"
  25 #include "third_party/isimpledom/ISimpleDOMNode.h"
  26 #include "ui/aura/window.h"
  27 #include "ui/aura/window_tree_host.h"
  28
  29 namespace content {
  30
  31 namespace {
  32
  33 // Helpers --------------------------------------------------------------------
  34
  35 base::win::ScopedComPtr<IAccessible> GetAccessibleFromResultVariant(
  36     IAccessible* parent,
  37     VARIANT* var) {
  38   base::win::ScopedComPtr<IAccessible> ptr;
  39   switch (V_VT(var)) {
  40     case VT_DISPATCH: {
  41       IDispatch* dispatch = V_DISPATCH(var);
  42       if (dispatch)
  43         ptr.QueryFrom(dispatch);
  44       break;
  45     }
  46
  47     case VT_I4: {
  48       base::win::ScopedComPtr<IDispatch> dispatch;
  49       HRESULT hr = parent->get_accChild(*var, dispatch.Receive());
  50       EXPECT_TRUE(SUCCEEDED(hr));
  51       if (dispatch)
  52         dispatch.QueryInterface(ptr.Receive());
  53       break;
  54     }
  55   }
  56   return ptr;
  57 }
  58
  59 HRESULT QueryIAccessible2(IAccessible* accessible, IAccessible2** accessible2) {
  60   // TODO(ctguil): For some reason querying the IAccessible2 interface from
  61   // IAccessible fails.
  62   base::win::ScopedComPtr<IServiceProvider> service_provider;
  63   HRESULT hr = accessible->QueryInterface(service_provider.Receive());
  64   return SUCCEEDED(hr) ?
  65       service_provider->QueryService(IID_IAccessible2, accessible2) : hr;
  66 }
  67
  68 // Recursively search through all of the descendants reachable from an
  69 // IAccessible node and return true if we find one with the given role
  70 // and name.
  71 void RecursiveFindNodeInAccessibilityTree(IAccessible* node,
  72                                           int32 expected_role,
  73                                           const std::wstring& expected_name,
  74                                           int32 depth,
  75                                           bool* found) {
  76   base::win::ScopedBstr name_bstr;
  77   base::win::ScopedVariant childid_self(CHILDID_SELF);
  78   node->get_accName(childid_self, name_bstr.Receive());
  79   std::wstring name(name_bstr, name_bstr.Length());
  80   base::win::ScopedVariant role;
  81   node->get_accRole(childid_self, role.Receive());
  82   ASSERT_EQ(VT_I4, role.type());
  83
  84   // Print the accessibility tree as we go, because if this test fails
  85   // on the bots, this is really helpful in figuring out why.
  86   for (int i = 0; i < depth; i++)
  87     printf("  ");
  88   printf("role=%s name=%s\n",
  89       base::WideToUTF8(IAccessibleRoleToString(V_I4(&role))).c_str(),
  90       base::WideToUTF8(name).c_str());
  91
  92   if (expected_role == V_I4(&role) && expected_name == name) {
  93     *found = true;
  94     return;
  95   }
  96
  97   LONG child_count = 0;
  98   HRESULT hr = node->get_accChildCount(&child_count);
  99   ASSERT_EQ(S_OK, hr);
 100
 101   scoped_ptr<VARIANT[]> child_array(new VARIANT[child_count]);
 102   LONG obtained_count = 0;
 103   hr = AccessibleChildren(
 104       node, 0, child_count, child_array.get(), &obtained_count);
 105   ASSERT_EQ(S_OK, hr);
 106   ASSERT_EQ(child_count, obtained_count);
 107
 108   for (int index = 0; index < obtained_count; index++) {
 109     base::win::ScopedComPtr<IAccessible> child_accessible(
 110         GetAccessibleFromResultVariant(node, &child_array.get()[index]));
 111     if (child_accessible) {
 112       RecursiveFindNodeInAccessibilityTree(
 113           child_accessible.get(), expected_role, expected_name, depth + 1,
 114           found);
 115       if (*found)
 116         return;
 117     }
 118   }
 119 }
 120
 121
 122 // AccessibilityWinBrowserTest ------------------------------------------------
 123
 124 class AccessibilityWinBrowserTest : public ContentBrowserTest {
 125  public:
 126   AccessibilityWinBrowserTest();
 127   virtual ~AccessibilityWinBrowserTest();
 128
 129  protected:
 130   void LoadInitialAccessibilityTreeFromHtml(const std::string& html);
 131   IAccessible* GetRendererAccessible();
 132   void ExecuteScript(const std::wstring& script);
 133
 134  private:
 135   DISALLOW_COPY_AND_ASSIGN(AccessibilityWinBrowserTest);
 136 };
 137
 138 AccessibilityWinBrowserTest::AccessibilityWinBrowserTest() {
 139 }
 140
 141 AccessibilityWinBrowserTest::~AccessibilityWinBrowserTest() {
 142 }
 143
 144 void AccessibilityWinBrowserTest::LoadInitialAccessibilityTreeFromHtml(
 145     const std::string& html) {
 146   AccessibilityNotificationWaiter waiter(
 147       shell(), AccessibilityModeComplete,
 148       ui::AX_EVENT_LOAD_COMPLETE);
 149   GURL html_data_url("data:text/html," + html);
 150   NavigateToURL(shell(), html_data_url);
 151   waiter.WaitForNotification();
 152 }
 153
 154 // Retrieve the MSAA client accessibility object for the Render Widget Host View
 155 // of the selected tab.
 156 IAccessible* AccessibilityWinBrowserTest::GetRendererAccessible() {
 157   content::WebContents* web_contents = shell()->web_contents();
 158   return web_contents->GetRenderWidgetHostView()->GetNativeViewAccessible();
 159 }
 160
 161 void AccessibilityWinBrowserTest::ExecuteScript(const std::wstring& script) {
 162   shell()->web_contents()->GetMainFrame()->ExecuteJavaScript(script);
 163 }
 164
 165
 166 // AccessibleChecker ----------------------------------------------------------
 167
 168 class AccessibleChecker {
 169  public:
 170   // This constructor can be used if the IA2 role will be the same as the MSAA
 171   // role.
 172   AccessibleChecker(const std::wstring& expected_name,
 173                     int32 expected_role,
 174                     const std::wstring& expected_value);
 175   AccessibleChecker(const std::wstring& expected_name,
 176                     int32 expected_role,
 177                     int32 expected_ia2_role,
 178                     const std::wstring& expected_value);
 179   AccessibleChecker(const std::wstring& expected_name,
 180                     const std::wstring& expected_role,
 181                     int32 expected_ia2_role,
 182                     const std::wstring& expected_value);
 183
 184   // Append an AccessibleChecker that verifies accessibility information for
 185   // a child IAccessible. Order is important.
 186   void AppendExpectedChild(AccessibleChecker* expected_child);
 187
 188   // Check that the name and role of the given IAccessible instance and its
 189   // descendants match the expected names and roles that this object was
 190   // initialized with.
 191   void CheckAccessible(IAccessible* accessible);
 192
 193   // Set the expected value for this AccessibleChecker.
 194   void SetExpectedValue(const std::wstring& expected_value);
 195
 196   // Set the expected state for this AccessibleChecker.
 197   void SetExpectedState(LONG expected_state);
 198
 199  private:
 200   typedef std::vector<AccessibleChecker*> AccessibleCheckerVector;
 201
 202   void CheckAccessibleName(IAccessible* accessible);
 203   void CheckAccessibleRole(IAccessible* accessible);
 204   void CheckIA2Role(IAccessible* accessible);
 205   void CheckAccessibleValue(IAccessible* accessible);
 206   void CheckAccessibleState(IAccessible* accessible);
 207   void CheckAccessibleChildren(IAccessible* accessible);
 208   base::string16 RoleVariantToString(const base::win::ScopedVariant& role);
 209
 210   // Expected accessible name. Checked against IAccessible::get_accName.
 211   std::wstring name_;
 212
 213   // Expected accessible role. Checked against IAccessible::get_accRole.
 214   base::win::ScopedVariant role_;
 215
 216   // Expected IAccessible2 role. Checked against IAccessible2::role.
 217   int32 ia2_role_;
 218
 219   // Expected accessible value. Checked against IAccessible::get_accValue.
 220   std::wstring value_;
 221
 222   // Expected accessible state. Checked against IAccessible::get_accState.
 223   LONG state_;
 224
 225   // Expected accessible children. Checked using IAccessible::get_accChildCount
 226   // and ::AccessibleChildren.
 227   AccessibleCheckerVector children_;
 228 };
 229
 230 AccessibleChecker::AccessibleChecker(const std::wstring& expected_name,
 231                                      int32 expected_role,
 232                                      const std::wstring& expected_value)
 233     : name_(expected_name),
 234       role_(expected_role),
 235       ia2_role_(expected_role),
 236       value_(expected_value),
 237       state_(-1) {
 238 }
 239
 240 AccessibleChecker::AccessibleChecker(const std::wstring& expected_name,
 241                                      int32 expected_role,
 242                                      int32 expected_ia2_role,
 243                                      const std::wstring& expected_value)
 244     : name_(expected_name),
 245       role_(expected_role),
 246       ia2_role_(expected_ia2_role),
 247       value_(expected_value),
 248       state_(-1) {
 249 }
 250
 251 AccessibleChecker::AccessibleChecker(const std::wstring& expected_name,
 252                                      const std::wstring& expected_role,
 253                                      int32 expected_ia2_role,
 254                                      const std::wstring& expected_value)
 255     : name_(expected_name),
 256       role_(expected_role.c_str()),
 257       ia2_role_(expected_ia2_role),
 258       value_(expected_value),
 259       state_(-1) {
 260 }
 261
 262 void AccessibleChecker::AppendExpectedChild(
 263     AccessibleChecker* expected_child) {
 264   children_.push_back(expected_child);
 265 }
 266
 267 void AccessibleChecker::CheckAccessible(IAccessible* accessible) {
 268   SCOPED_TRACE("while checking " +
 269                    base::UTF16ToUTF8(RoleVariantToString(role_)));
 270   CheckAccessibleName(accessible);
 271   CheckAccessibleRole(accessible);
 272   CheckIA2Role(accessible);
 273   CheckAccessibleValue(accessible);
 274   CheckAccessibleState(accessible);
 275   CheckAccessibleChildren(accessible);
 276 }
 277
 278 void AccessibleChecker::SetExpectedValue(const std::wstring& expected_value) {
 279   value_ = expected_value;
 280 }
 281
 282 void AccessibleChecker::SetExpectedState(LONG expected_state) {
 283   state_ = expected_state;
 284 }
 285
 286 void AccessibleChecker::CheckAccessibleName(IAccessible* accessible) {
 287   base::win::ScopedBstr name;
 288   base::win::ScopedVariant childid_self(CHILDID_SELF);
 289   HRESULT hr = accessible->get_accName(childid_self, name.Receive());
 290
 291   if (name_.empty()) {
 292     // If the object doesn't have name S_FALSE should be returned.
 293     EXPECT_EQ(S_FALSE, hr);
 294   } else {
 295     // Test that the correct string was returned.
 296     EXPECT_EQ(S_OK, hr);
 297     EXPECT_EQ(name_, std::wstring(name, name.Length()));
 298   }
 299 }
 300
 301 void AccessibleChecker::CheckAccessibleRole(IAccessible* accessible) {
 302   base::win::ScopedVariant role;
 303   base::win::ScopedVariant childid_self(CHILDID_SELF);
 304   HRESULT hr = accessible->get_accRole(childid_self, role.Receive());
 305   ASSERT_EQ(S_OK, hr);
 306   EXPECT_EQ(0, role_.Compare(role))
 307       << "Expected role: " << RoleVariantToString(role_)
 308       << "\nGot role: " << RoleVariantToString(role);
 309 }
 310
 311 void AccessibleChecker::CheckIA2Role(IAccessible* accessible) {
 312   base::win::ScopedComPtr<IAccessible2> accessible2;
 313   HRESULT hr = QueryIAccessible2(accessible, accessible2.Receive());
 314   ASSERT_EQ(S_OK, hr);
 315   long ia2_role = 0;
 316   hr = accessible2->role(&ia2_role);
 317   ASSERT_EQ(S_OK, hr);
 318   EXPECT_EQ(ia2_role_, ia2_role)
 319     << "Expected ia2 role: " << IAccessible2RoleToString(ia2_role_)
 320     << "\nGot ia2 role: " << IAccessible2RoleToString(ia2_role);
 321 }
 322
 323 void AccessibleChecker::CheckAccessibleValue(IAccessible* accessible) {
 324   // Don't check the value if if's a DOCUMENT role, because the value
 325   // is supposed to be the url (and we don't keep track of that in the
 326   // test expectations).
 327   base::win::ScopedVariant role;
 328   base::win::ScopedVariant childid_self(CHILDID_SELF);
 329   HRESULT hr = accessible->get_accRole(childid_self, role.Receive());
 330   ASSERT_EQ(S_OK, hr);
 331   if (role.type() == VT_I4 && V_I4(&role) == ROLE_SYSTEM_DOCUMENT)
 332     return;
 333
 334   // Get the value.
 335   base::win::ScopedBstr value;
 336   hr = accessible->get_accValue(childid_self, value.Receive());
 337   EXPECT_EQ(S_OK, hr);
 338
 339   // Test that the correct string was returned.
 340   EXPECT_EQ(value_, std::wstring(value, value.Length()));
 341 }
 342
 343 void AccessibleChecker::CheckAccessibleState(IAccessible* accessible) {
 344   if (state_ < 0)
 345     return;
 346
 347   base::win::ScopedVariant state;
 348   base::win::ScopedVariant childid_self(CHILDID_SELF);
 349   HRESULT hr = accessible->get_accState(childid_self, state.Receive());
 350   EXPECT_EQ(S_OK, hr);
 351   ASSERT_EQ(VT_I4, state.type());
 352   LONG obj_state = V_I4(&state);
 353   // Avoid flakiness. The "offscreen" state depends on whether the browser
 354   // window is frontmost or not, and "hottracked" depends on whether the
 355   // mouse cursor happens to be over the element.
 356   obj_state &= ~(STATE_SYSTEM_OFFSCREEN | STATE_SYSTEM_HOTTRACKED);
 357   EXPECT_EQ(state_, obj_state)
 358     << "Expected state: " << IAccessibleStateToString(state_)
 359     << "\nGot state: " << IAccessibleStateToString(obj_state);
 360 }
 361
 362 void AccessibleChecker::CheckAccessibleChildren(IAccessible* parent) {
 363   LONG child_count = 0;
 364   HRESULT hr = parent->get_accChildCount(&child_count);
 365   EXPECT_EQ(S_OK, hr);
 366   ASSERT_EQ(child_count, children_.size());
 367
 368   scoped_ptr<VARIANT[]> child_array(new VARIANT[child_count]);
 369   LONG obtained_count = 0;
 370   hr = AccessibleChildren(parent, 0, child_count,
 371                           child_array.get(), &obtained_count);
 372   ASSERT_EQ(S_OK, hr);
 373   ASSERT_EQ(child_count, obtained_count);
 374
 375   VARIANT* child = child_array.get();
 376   for (AccessibleCheckerVector::iterator child_checker = children_.begin();
 377        child_checker != children_.end();
 378        ++child_checker, ++child) {
 379     base::win::ScopedComPtr<IAccessible> child_accessible(
 380         GetAccessibleFromResultVariant(parent, child));
 381     ASSERT_TRUE(child_accessible.get());
 382     (*child_checker)->CheckAccessible(child_accessible);
 383   }
 384 }
 385
 386 base::string16 AccessibleChecker::RoleVariantToString(
 387     const base::win::ScopedVariant& role) {
 388   if (role.type() == VT_I4)
 389     return IAccessibleRoleToString(V_I4(&role));
 390   if (role.type() == VT_BSTR)
 391     return base::string16(V_BSTR(&role), SysStringLen(V_BSTR(&role)));
 392   return base::string16();
 393 }
 394
 395 }  // namespace
 396
 397
 398 // Tests ----------------------------------------------------------------------
 399
 400 IN_PROC_BROWSER_TEST_F(AccessibilityWinBrowserTest,
 401                        TestBusyAccessibilityTree) {
 402   NavigateToURL(shell(), GURL(url::kAboutBlankURL));
 403
 404   // The initial accessible returned should have state STATE_SYSTEM_BUSY while
 405   // the accessibility tree is being requested from the renderer.
 406   AccessibleChecker document1_checker(std::wstring(), ROLE_SYSTEM_DOCUMENT,
 407                                       std::wstring());
 408   document1_checker.SetExpectedState(
 409       STATE_SYSTEM_READONLY | STATE_SYSTEM_FOCUSABLE | STATE_SYSTEM_FOCUSED |
 410       STATE_SYSTEM_BUSY);
 411   document1_checker.CheckAccessible(GetRendererAccessible());
 412 }
 413
 414 // Periodically failing.  See crbug.com/145537
 415 IN_PROC_BROWSER_TEST_F(AccessibilityWinBrowserTest,
 416                        DISABLED_TestNotificationActiveDescendantChanged) {
 417   LoadInitialAccessibilityTreeFromHtml(
 418       "<ul tabindex='-1' role='radiogroup' aria-label='ul'>"
 419       "<li id='li'>li</li></ul>");
 420
 421   // Check the browser's copy of the renderer accessibility tree.
 422   AccessibleChecker list_marker_checker(L"\x2022", ROLE_SYSTEM_TEXT,
 423                                         std::wstring());
 424   AccessibleChecker static_text_checker(L"li", ROLE_SYSTEM_TEXT,
 425                                         std::wstring());
 426   AccessibleChecker list_item_checker(std::wstring(), ROLE_SYSTEM_LISTITEM,
 427                                       std::wstring());
 428   list_item_checker.SetExpectedState(STATE_SYSTEM_READONLY);
 429   AccessibleChecker radio_group_checker(L"ul", ROLE_SYSTEM_GROUPING,
 430                                         IA2_ROLE_SECTION, std::wstring());
 431   radio_group_checker.SetExpectedState(STATE_SYSTEM_FOCUSABLE);
 432   AccessibleChecker document_checker(std::wstring(), ROLE_SYSTEM_DOCUMENT,
 433                                      std::wstring());
 434   list_item_checker.AppendExpectedChild(&list_marker_checker);
 435   list_item_checker.AppendExpectedChild(&static_text_checker);
 436   radio_group_checker.AppendExpectedChild(&list_item_checker);
 437   document_checker.AppendExpectedChild(&radio_group_checker);
 438   document_checker.CheckAccessible(GetRendererAccessible());
 439
 440   // Set focus to the radio group.
 441   scoped_ptr<AccessibilityNotificationWaiter> waiter(
 442       new AccessibilityNotificationWaiter(
 443           shell(), AccessibilityModeComplete,
 444           ui::AX_EVENT_FOCUS));
 445   ExecuteScript(L"document.body.children[0].focus()");
 446   waiter->WaitForNotification();
 447
 448   // Check that the accessibility tree of the browser has been updated.
 449   radio_group_checker.SetExpectedState(
 450       STATE_SYSTEM_FOCUSABLE | STATE_SYSTEM_FOCUSED);
 451   document_checker.CheckAccessible(GetRendererAccessible());
 452
 453   // Set the active descendant of the radio group
 454   waiter.reset(new AccessibilityNotificationWaiter(
 455       shell(), AccessibilityModeComplete,
 456       ui::AX_EVENT_FOCUS));
 457   ExecuteScript(
 458       L"document.body.children[0].setAttribute('aria-activedescendant', 'li')");
 459   waiter->WaitForNotification();
 460
 461   // Check that the accessibility tree of the browser has been updated.
 462   list_item_checker.SetExpectedState(
 463       STATE_SYSTEM_READONLY | STATE_SYSTEM_FOCUSED);
 464   radio_group_checker.SetExpectedState(STATE_SYSTEM_FOCUSABLE);
 465   document_checker.CheckAccessible(GetRendererAccessible());
 466 }
 467
 468 IN_PROC_BROWSER_TEST_F(AccessibilityWinBrowserTest,
 469                        TestNotificationCheckedStateChanged) {
 470   LoadInitialAccessibilityTreeFromHtml(
 471       "<body><input type='checkbox' /></body>");
 472
 473   // Check the browser's copy of the renderer accessibility tree.
 474   AccessibleChecker checkbox_checker(std::wstring(), ROLE_SYSTEM_CHECKBUTTON,
 475                                      std::wstring());
 476   checkbox_checker.SetExpectedState(STATE_SYSTEM_FOCUSABLE);
 477   AccessibleChecker body_checker(std::wstring(), L"body", IA2_ROLE_SECTION,
 478                                  std::wstring());
 479   AccessibleChecker document_checker(std::wstring(), ROLE_SYSTEM_DOCUMENT,
 480                                      std::wstring());
 481   body_checker.AppendExpectedChild(&checkbox_checker);
 482   document_checker.AppendExpectedChild(&body_checker);
 483   document_checker.CheckAccessible(GetRendererAccessible());
 484
 485   // Check the checkbox.
 486   scoped_ptr<AccessibilityNotificationWaiter> waiter(
 487       new AccessibilityNotificationWaiter(
 488           shell(), AccessibilityModeComplete,
 489           ui::AX_EVENT_CHECKED_STATE_CHANGED));
 490   ExecuteScript(L"document.body.children[0].checked=true");
 491   waiter->WaitForNotification();
 492
 493   // Check that the accessibility tree of the browser has been updated.
 494   checkbox_checker.SetExpectedState(
 495       STATE_SYSTEM_CHECKED | STATE_SYSTEM_FOCUSABLE);
 496   document_checker.CheckAccessible(GetRendererAccessible());
 497 }
 498
 499 IN_PROC_BROWSER_TEST_F(AccessibilityWinBrowserTest,
 500                        TestNotificationChildrenChanged) {
 501   // The role attribute causes the node to be in the accessibility tree.
 502   LoadInitialAccessibilityTreeFromHtml("<body role=group></body>");
 503
 504   // Check the browser's copy of the renderer accessibility tree.
 505   AccessibleChecker group_checker(std::wstring(), ROLE_SYSTEM_GROUPING,
 506                                   std::wstring());
 507   AccessibleChecker document_checker(std::wstring(), ROLE_SYSTEM_DOCUMENT,
 508                                      std::wstring());
 509   document_checker.AppendExpectedChild(&group_checker);
 510   document_checker.CheckAccessible(GetRendererAccessible());
 511
 512   // Change the children of the document body.
 513   scoped_ptr<AccessibilityNotificationWaiter> waiter(
 514       new AccessibilityNotificationWaiter(
 515           shell(),
 516           AccessibilityModeComplete,
 517           ui::AX_EVENT_CHILDREN_CHANGED));
 518   ExecuteScript(L"document.body.innerHTML='<b>new text</b>'");
 519   waiter->WaitForNotification();
 520
 521   // Check that the accessibility tree of the browser has been updated.
 522   AccessibleChecker text_checker(
 523       L"new text", ROLE_SYSTEM_STATICTEXT, std::wstring());
 524   group_checker.AppendExpectedChild(&text_checker);
 525   document_checker.CheckAccessible(GetRendererAccessible());
 526 }
 527
 528 IN_PROC_BROWSER_TEST_F(AccessibilityWinBrowserTest,
 529                        TestNotificationChildrenChanged2) {
 530   // The role attribute causes the node to be in the accessibility tree.
 531   LoadInitialAccessibilityTreeFromHtml(
 532       "<div role=group style='visibility: hidden'>text</div>");
 533
 534   // Check the accessible tree of the browser.
 535   AccessibleChecker document_checker(std::wstring(), ROLE_SYSTEM_DOCUMENT,
 536                                      std::wstring());
 537   document_checker.CheckAccessible(GetRendererAccessible());
 538
 539   // Change the children of the document body.
 540   scoped_ptr<AccessibilityNotificationWaiter> waiter(
 541       new AccessibilityNotificationWaiter(
 542           shell(), AccessibilityModeComplete,
 543           ui::AX_EVENT_CHILDREN_CHANGED));
 544   ExecuteScript(L"document.body.children[0].style.visibility='visible'");
 545   waiter->WaitForNotification();
 546
 547   // Check that the accessibility tree of the browser has been updated.
 548   AccessibleChecker static_text_checker(L"text", ROLE_SYSTEM_STATICTEXT,
 549                                         std::wstring());
 550   AccessibleChecker group_checker(std::wstring(), ROLE_SYSTEM_GROUPING,
 551                                   std::wstring());
 552   document_checker.AppendExpectedChild(&group_checker);
 553   group_checker.AppendExpectedChild(&static_text_checker);
 554   document_checker.CheckAccessible(GetRendererAccessible());
 555 }
 556
 557 IN_PROC_BROWSER_TEST_F(AccessibilityWinBrowserTest,
 558                        TestNotificationFocusChanged) {
 559   // The role attribute causes the node to be in the accessibility tree.
 560   LoadInitialAccessibilityTreeFromHtml("<div role=group tabindex='-1'></div>");
 561
 562   // Check the browser's copy of the renderer accessibility tree.
 563   SCOPED_TRACE("Check initial tree");
 564   AccessibleChecker group_checker(std::wstring(), ROLE_SYSTEM_GROUPING,
 565                                   std::wstring());
 566   group_checker.SetExpectedState(STATE_SYSTEM_FOCUSABLE);
 567   AccessibleChecker document_checker(std::wstring(), ROLE_SYSTEM_DOCUMENT,
 568                                      std::wstring());
 569   document_checker.AppendExpectedChild(&group_checker);
 570   document_checker.CheckAccessible(GetRendererAccessible());
 571
 572   // Focus the div in the document
 573   scoped_ptr<AccessibilityNotificationWaiter> waiter(
 574       new AccessibilityNotificationWaiter(
 575           shell(), AccessibilityModeComplete,
 576           ui::AX_EVENT_FOCUS));
 577   ExecuteScript(L"document.body.children[0].focus()");
 578   waiter->WaitForNotification();
 579
 580   // Check that the accessibility tree of the browser has been updated.
 581   SCOPED_TRACE("Check updated tree after focusing div");
 582   group_checker.SetExpectedState(
 583       STATE_SYSTEM_FOCUSABLE | STATE_SYSTEM_FOCUSED);
 584   document_checker.CheckAccessible(GetRendererAccessible());
 585
 586   // Focus the document accessible. This will un-focus the current node.
 587   waiter.reset(
 588       new AccessibilityNotificationWaiter(
 589           shell(), AccessibilityModeComplete,
 590           ui::AX_EVENT_BLUR));
 591   base::win::ScopedComPtr<IAccessible> document_accessible(
 592       GetRendererAccessible());
 593   ASSERT_NE(document_accessible.get(), reinterpret_cast<IAccessible*>(NULL));
 594   base::win::ScopedVariant childid_self(CHILDID_SELF);
 595   HRESULT hr = document_accessible->accSelect(SELFLAG_TAKEFOCUS, childid_self);
 596   ASSERT_EQ(S_OK, hr);
 597   waiter->WaitForNotification();
 598
 599   // Check that the accessibility tree of the browser has been updated.
 600   SCOPED_TRACE("Check updated tree after focusing document again");
 601   group_checker.SetExpectedState(STATE_SYSTEM_FOCUSABLE);
 602   document_checker.CheckAccessible(GetRendererAccessible());
 603 }
 604
 605 IN_PROC_BROWSER_TEST_F(AccessibilityWinBrowserTest,
 606                        TestNotificationValueChanged) {
 607   LoadInitialAccessibilityTreeFromHtml(
 608       "<body><input type='text' value='old value'/></body>");
 609
 610   // Check the browser's copy of the renderer accessibility tree.
 611   AccessibleChecker text_field_checker(std::wstring(), ROLE_SYSTEM_TEXT,
 612                                        L"old value");
 613   text_field_checker.SetExpectedState(STATE_SYSTEM_FOCUSABLE);
 614   AccessibleChecker body_checker(std::wstring(), L"body", IA2_ROLE_SECTION,
 615                                  std::wstring());
 616   AccessibleChecker document_checker(std::wstring(), ROLE_SYSTEM_DOCUMENT,
 617                                      std::wstring());
 618   body_checker.AppendExpectedChild(&text_field_checker);
 619   document_checker.AppendExpectedChild(&body_checker);
 620   document_checker.CheckAccessible(GetRendererAccessible());
 621
 622   // Set the value of the text control
 623   scoped_ptr<AccessibilityNotificationWaiter> waiter(
 624       new AccessibilityNotificationWaiter(
 625           shell(), AccessibilityModeComplete,
 626           ui::AX_EVENT_VALUE_CHANGED));
 627   ExecuteScript(L"document.body.children[0].value='new value'");
 628   waiter->WaitForNotification();
 629
 630   // Check that the accessibility tree of the browser has been updated.
 631   text_field_checker.SetExpectedValue(L"new value");
 632   document_checker.CheckAccessible(GetRendererAccessible());
 633 }
 634
 635 // This test verifies that the web content's accessibility tree is a
 636 // descendant of the main browser window's accessibility tree, so that
 637 // tools like AccExplorer32 or AccProbe can be used to examine Chrome's
 638 // accessibility support.
 639 //
 640 // If you made a change and this test now fails, check that the NativeViewHost
 641 // that wraps the tab contents returns the IAccessible implementation
 642 // provided by RenderWidgetHostViewWin in GetNativeViewAccessible().
 643 IN_PROC_BROWSER_TEST_F(AccessibilityWinBrowserTest,
 644                        ContainsRendererAccessibilityTree) {
 645   LoadInitialAccessibilityTreeFromHtml(
 646       "<html><head><title>MyDocument</title></head>"
 647       "<body>Content</body></html>");
 648
 649   // Get the accessibility object for the window tree host.
 650   aura::Window* window = shell()->window();
 651   CHECK(window);
 652   aura::WindowTreeHost* window_tree_host = window->GetHost();
 653   CHECK(window_tree_host);
 654   HWND hwnd = window_tree_host->GetAcceleratedWidget();
 655   CHECK(hwnd);
 656   base::win::ScopedComPtr<IAccessible> browser_accessible;
 657   HRESULT hr = AccessibleObjectFromWindow(
 658       hwnd,
 659       OBJID_WINDOW,
 660       IID_IAccessible,
 661       reinterpret_cast<void**>(browser_accessible.Receive()));
 662   ASSERT_EQ(S_OK, hr);
 663
 664   bool found = false;
 665   RecursiveFindNodeInAccessibilityTree(
 666       browser_accessible.get(), ROLE_SYSTEM_DOCUMENT, L"MyDocument", 0, &found);
 667   ASSERT_EQ(found, true);
 668 }
 669
 670 IN_PROC_BROWSER_TEST_F(AccessibilityWinBrowserTest,
 671                        SupportsISimpleDOM) {
 672   LoadInitialAccessibilityTreeFromHtml(
 673       "<body><input type='checkbox' /></body>");
 674
 675   // Get the IAccessible object for the document.
 676   base::win::ScopedComPtr<IAccessible> document_accessible(
 677       GetRendererAccessible());
 678   ASSERT_NE(document_accessible.get(), reinterpret_cast<IAccessible*>(NULL));
 679
 680   // Get the ISimpleDOM object for the document.
 681   base::win::ScopedComPtr<IServiceProvider> service_provider;
 682   HRESULT hr = static_cast<IAccessible*>(document_accessible)->QueryInterface(
 683       service_provider.Receive());
 684   ASSERT_EQ(S_OK, hr);
 685   const GUID refguid = {0x0c539790, 0x12e4, 0x11cf,
 686                         0xb6, 0x61, 0x00, 0xaa, 0x00, 0x4c, 0xd6, 0xd8};
 687   base::win::ScopedComPtr<ISimpleDOMNode> document_isimpledomnode;
 688   hr = static_cast<IServiceProvider *>(service_provider)->QueryService(
 689       refguid, IID_ISimpleDOMNode,
 690       reinterpret_cast<void**>(document_isimpledomnode.Receive()));
 691   ASSERT_EQ(S_OK, hr);
 692
 693   base::win::ScopedBstr node_name;
 694   short name_space_id;  // NOLINT
 695   base::win::ScopedBstr node_value;
 696   unsigned int num_children;
 697   unsigned int unique_id;
 698   unsigned short node_type;  // NOLINT
 699   hr = document_isimpledomnode->get_nodeInfo(
 700       node_name.Receive(), &name_space_id, node_value.Receive(), &num_children,
 701       &unique_id, &node_type);
 702   ASSERT_EQ(S_OK, hr);
 703   EXPECT_EQ(NODETYPE_DOCUMENT, node_type);
 704   EXPECT_EQ(1, num_children);
 705   node_name.Reset();
 706   node_value.Reset();
 707
 708   base::win::ScopedComPtr<ISimpleDOMNode> body_isimpledomnode;
 709   hr = document_isimpledomnode->get_firstChild(
 710       body_isimpledomnode.Receive());
 711   ASSERT_EQ(S_OK, hr);
 712   hr = body_isimpledomnode->get_nodeInfo(
 713       node_name.Receive(), &name_space_id, node_value.Receive(), &num_children,
 714       &unique_id, &node_type);
 715   ASSERT_EQ(S_OK, hr);
 716   EXPECT_EQ(L"body", std::wstring(node_name, node_name.Length()));
 717   EXPECT_EQ(NODETYPE_ELEMENT, node_type);
 718   EXPECT_EQ(1, num_children);
 719   node_name.Reset();
 720   node_value.Reset();
 721
 722   base::win::ScopedComPtr<ISimpleDOMNode> checkbox_isimpledomnode;
 723   hr = body_isimpledomnode->get_firstChild(
 724       checkbox_isimpledomnode.Receive());
 725   ASSERT_EQ(S_OK, hr);
 726   hr = checkbox_isimpledomnode->get_nodeInfo(
 727       node_name.Receive(), &name_space_id, node_value.Receive(), &num_children,
 728       &unique_id, &node_type);
 729   ASSERT_EQ(S_OK, hr);
 730   EXPECT_EQ(L"input", std::wstring(node_name, node_name.Length()));
 731   EXPECT_EQ(NODETYPE_ELEMENT, node_type);
 732   EXPECT_EQ(0, num_children);
 733 }
 734
 735 IN_PROC_BROWSER_TEST_F(AccessibilityWinBrowserTest, TestRoleGroup) {
 736   LoadInitialAccessibilityTreeFromHtml(
 737       "<fieldset></fieldset><div role=group></div>");
 738
 739   // Check the browser's copy of the renderer accessibility tree.
 740   AccessibleChecker grouping1_checker(std::wstring(), ROLE_SYSTEM_GROUPING,
 741                                       std::wstring());
 742   AccessibleChecker grouping2_checker(std::wstring(), ROLE_SYSTEM_GROUPING,
 743                                       std::wstring());
 744   AccessibleChecker document_checker(std::wstring(), ROLE_SYSTEM_DOCUMENT,
 745                                      std::wstring());
 746   document_checker.AppendExpectedChild(&grouping1_checker);
 747   document_checker.AppendExpectedChild(&grouping2_checker);
 748   document_checker.CheckAccessible(GetRendererAccessible());
 749 }
 750
 751 }  // namespace content