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| 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 "ui/views/accessibility/native_view_accessibility_win.h" | |
| 6 | |
| 7 #include <oleacc.h> | |
| 8 #include <UIAutomationClient.h> | |
| 9 | |
| 10 #include <set> | |
| 11 #include <vector> | |
| 12 | |
| 13 #include "base/memory/singleton.h" | |
| 14 #include "base/strings/utf_string_conversions.h" | |
| 15 #include "base/win/scoped_comptr.h" | |
| 16 #include "base/win/windows_version.h" | |
| 17 #include "third_party/iaccessible2/ia2_api_all.h" | |
| 18 #include "ui/accessibility/ax_enums.h" | |
| 19 #include "ui/accessibility/ax_text_utils.h" | |
| 20 #include "ui/accessibility/ax_view_state.h" | |
| 21 #include "ui/base/win/accessibility_ids_win.h" | |
| 22 #include "ui/base/win/accessibility_misc_utils.h" | |
| 23 #include "ui/base/win/atl_module.h" | |
| 24 #include "ui/views/controls/button/custom_button.h" | |
| 25 #include "ui/views/focus/focus_manager.h" | |
| 26 #include "ui/views/focus/view_storage.h" | |
| 27 #include "ui/views/widget/widget.h" | |
| 28 #include "ui/views/win/hwnd_util.h" | |
| 29 | |
| 30 namespace views { | |
| 31 namespace { | |
| 32 | |
| 33 class AccessibleWebViewRegistry { | |
| 34 public: | |
| 35 static AccessibleWebViewRegistry* GetInstance(); | |
| 36 | |
| 37 void RegisterWebView(View* web_view); | |
| 38 | |
| 39 void UnregisterWebView(View* web_view); | |
| 40 | |
| 41 // Given the view that received the request for the accessible | |
| 42 // id in |top_view|, and the child id requested, return the native | |
| 43 // accessible object with that child id from one of the WebViews in | |
| 44 // |top_view|'s view hierarchy, if any. | |
| 45 IAccessible* GetAccessibleFromWebView(View* top_view, long child_id); | |
| 46 | |
| 47 // The system uses IAccessible APIs for many purposes, but only | |
| 48 // assistive technology like screen readers uses IAccessible2. | |
| 49 // Call this method to note that the IAccessible2 interface was queried and | |
| 50 // that WebViews should be proactively notified that this interface will be | |
| 51 // used. If this is enabled for the first time, this will explicitly call | |
| 52 // QueryService with an argument of IAccessible2 on all WebViews, otherwise | |
| 53 // it will just do it from now on. | |
| 54 void EnableIAccessible2Support(); | |
| 55 | |
| 56 private: | |
| 57 friend struct DefaultSingletonTraits<AccessibleWebViewRegistry>; | |
| 58 AccessibleWebViewRegistry(); | |
| 59 ~AccessibleWebViewRegistry() {} | |
| 60 | |
| 61 IAccessible* AccessibleObjectFromChildId(View* web_view, long child_id); | |
| 62 | |
| 63 void QueryIAccessible2Interface(View* web_view); | |
| 64 | |
| 65 // Set of all web views. We check whether each one is contained in a | |
| 66 // top view dynamically rather than keeping track of a map. | |
| 67 std::set<View*> web_views_; | |
| 68 | |
| 69 // The most recent top view used in a call to GetAccessibleFromWebView. | |
| 70 View* last_top_view_; | |
| 71 | |
| 72 // The most recent web view where an accessible object was found, | |
| 73 // corresponding to |last_top_view_|. | |
| 74 View* last_web_view_; | |
| 75 | |
| 76 // If IAccessible2 support is enabled, we query the IAccessible2 interface | |
| 77 // of WebViews proactively when they're registered, so that they are | |
| 78 // aware that they need to support this interface. | |
| 79 bool iaccessible2_support_enabled_; | |
| 80 | |
| 81 DISALLOW_COPY_AND_ASSIGN(AccessibleWebViewRegistry); | |
| 82 }; | |
| 83 | |
| 84 AccessibleWebViewRegistry::AccessibleWebViewRegistry() | |
| 85 : last_top_view_(NULL), | |
| 86 last_web_view_(NULL), | |
| 87 iaccessible2_support_enabled_(false) { | |
| 88 } | |
| 89 | |
| 90 AccessibleWebViewRegistry* AccessibleWebViewRegistry::GetInstance() { | |
| 91 return Singleton<AccessibleWebViewRegistry>::get(); | |
| 92 } | |
| 93 | |
| 94 void AccessibleWebViewRegistry::RegisterWebView(View* web_view) { | |
| 95 DCHECK(web_views_.find(web_view) == web_views_.end()); | |
| 96 web_views_.insert(web_view); | |
| 97 | |
| 98 if (iaccessible2_support_enabled_) | |
| 99 QueryIAccessible2Interface(web_view); | |
| 100 } | |
| 101 | |
| 102 void AccessibleWebViewRegistry::UnregisterWebView(View* web_view) { | |
| 103 DCHECK(web_views_.find(web_view) != web_views_.end()); | |
| 104 web_views_.erase(web_view); | |
| 105 if (last_web_view_ == web_view) { | |
| 106 last_top_view_ = NULL; | |
| 107 last_web_view_ = NULL; | |
| 108 } | |
| 109 } | |
| 110 | |
| 111 IAccessible* AccessibleWebViewRegistry::GetAccessibleFromWebView( | |
| 112 View* top_view, long child_id) { | |
| 113 // This function gets called frequently, so try to avoid searching all | |
| 114 // of the web views if the notification is on the same web view that | |
| 115 // sent the last one. | |
| 116 if (last_top_view_ == top_view) { | |
| 117 IAccessible* accessible = | |
| 118 AccessibleObjectFromChildId(last_web_view_, child_id); | |
| 119 if (accessible) | |
| 120 return accessible; | |
| 121 } | |
| 122 | |
| 123 // Search all web views. For each one, first ensure it's a descendant | |
| 124 // of this view where the event was posted - and if so, see if it owns | |
| 125 // an accessible object with that child id. If so, save the view to speed | |
| 126 // up the next notification. | |
| 127 for (std::set<View*>::iterator iter = web_views_.begin(); | |
| 128 iter != web_views_.end(); ++iter) { | |
| 129 View* web_view = *iter; | |
| 130 if (top_view == web_view || !top_view->Contains(web_view)) | |
| 131 continue; | |
| 132 IAccessible* accessible = AccessibleObjectFromChildId(web_view, child_id); | |
| 133 if (accessible) { | |
| 134 last_top_view_ = top_view; | |
| 135 last_web_view_ = web_view; | |
| 136 return accessible; | |
| 137 } | |
| 138 } | |
| 139 | |
| 140 return NULL; | |
| 141 } | |
| 142 | |
| 143 void AccessibleWebViewRegistry::EnableIAccessible2Support() { | |
| 144 if (iaccessible2_support_enabled_) | |
| 145 return; | |
| 146 iaccessible2_support_enabled_ = true; | |
| 147 for (std::set<View*>::iterator iter = web_views_.begin(); | |
| 148 iter != web_views_.end(); ++iter) { | |
| 149 QueryIAccessible2Interface(*iter); | |
| 150 } | |
| 151 } | |
| 152 | |
| 153 IAccessible* AccessibleWebViewRegistry::AccessibleObjectFromChildId( | |
| 154 View* web_view, | |
| 155 long child_id) { | |
| 156 IAccessible* web_view_accessible = web_view->GetNativeViewAccessible(); | |
| 157 if (web_view_accessible == NULL) | |
| 158 return NULL; | |
| 159 | |
| 160 VARIANT var_child; | |
| 161 var_child.vt = VT_I4; | |
| 162 var_child.lVal = child_id; | |
| 163 IAccessible* result = NULL; | |
| 164 if (S_OK == web_view_accessible->get_accChild( | |
| 165 var_child, reinterpret_cast<IDispatch**>(&result))) { | |
| 166 return result; | |
| 167 } | |
| 168 | |
| 169 return NULL; | |
| 170 } | |
| 171 | |
| 172 void AccessibleWebViewRegistry::QueryIAccessible2Interface(View* web_view) { | |
| 173 IAccessible* web_view_accessible = web_view->GetNativeViewAccessible(); | |
| 174 if (!web_view_accessible) | |
| 175 return; | |
| 176 | |
| 177 base::win::ScopedComPtr<IServiceProvider> service_provider; | |
| 178 if (S_OK != web_view_accessible->QueryInterface(service_provider.Receive())) | |
| 179 return; | |
| 180 base::win::ScopedComPtr<IAccessible2> iaccessible2; | |
| 181 service_provider->QueryService( | |
| 182 IID_IAccessible, IID_IAccessible2, | |
| 183 reinterpret_cast<void**>(iaccessible2.Receive())); | |
| 184 } | |
| 185 | |
| 186 } // anonymous namespace | |
| 187 | |
| 188 // static | |
| 189 long NativeViewAccessibilityWin::next_unique_id_ = 1; | |
| 190 int NativeViewAccessibilityWin::view_storage_ids_[kMaxViewStorageIds] = {0}; | |
| 191 int NativeViewAccessibilityWin::next_view_storage_id_index_ = 0; | |
| 192 std::vector<int> NativeViewAccessibilityWin::alert_target_view_storage_ids_; | |
| 193 | |
| 194 // static | |
| 195 NativeViewAccessibility* NativeViewAccessibility::Create(View* view) { | |
| 196 // Make sure ATL is initialized in this module. | |
| 197 ui::win::CreateATLModuleIfNeeded(); | |
| 198 | |
| 199 CComObject<NativeViewAccessibilityWin>* instance = NULL; | |
| 200 HRESULT hr = CComObject<NativeViewAccessibilityWin>::CreateInstance( | |
| 201 &instance); | |
| 202 DCHECK(SUCCEEDED(hr)); | |
| 203 instance->set_view(view); | |
| 204 instance->AddRef(); | |
| 205 return instance; | |
| 206 } | |
| 207 | |
| 208 NativeViewAccessibilityWin::NativeViewAccessibilityWin() | |
| 209 : unique_id_(next_unique_id_++) { | |
| 210 } | |
| 211 | |
| 212 NativeViewAccessibilityWin::~NativeViewAccessibilityWin() { | |
| 213 RemoveAlertTarget(); | |
| 214 } | |
| 215 | |
| 216 void NativeViewAccessibilityWin::NotifyAccessibilityEvent( | |
| 217 ui::AXEvent event_type) { | |
| 218 if (!view_) | |
| 219 return; | |
| 220 | |
| 221 ViewStorage* view_storage = ViewStorage::GetInstance(); | |
| 222 HWND hwnd = HWNDForView(view_); | |
| 223 int view_storage_id = view_storage_ids_[next_view_storage_id_index_]; | |
| 224 if (view_storage_id == 0) { | |
| 225 view_storage_id = view_storage->CreateStorageID(); | |
| 226 view_storage_ids_[next_view_storage_id_index_] = view_storage_id; | |
| 227 } else { | |
| 228 view_storage->RemoveView(view_storage_id); | |
| 229 } | |
| 230 view_storage->StoreView(view_storage_id, view_); | |
| 231 | |
| 232 // Positive child ids are used for enumerating direct children, | |
| 233 // negative child ids can be used as unique ids to refer to a specific | |
| 234 // descendants. Make index into view_storage_ids_ into a negative child id. | |
| 235 int child_id = | |
| 236 base::win::kFirstViewsAccessibilityId - next_view_storage_id_index_; | |
| 237 ::NotifyWinEvent(MSAAEvent(event_type), hwnd, OBJID_CLIENT, child_id); | |
| 238 next_view_storage_id_index_ = | |
| 239 (next_view_storage_id_index_ + 1) % kMaxViewStorageIds; | |
| 240 | |
| 241 // Keep track of views that are a target of an alert event. | |
| 242 if (event_type == ui::AX_EVENT_ALERT) | |
| 243 AddAlertTarget(); | |
| 244 } | |
| 245 | |
| 246 gfx::NativeViewAccessible NativeViewAccessibilityWin::GetNativeObject() { | |
| 247 return this; | |
| 248 } | |
| 249 | |
| 250 void NativeViewAccessibilityWin::Destroy() { | |
| 251 view_ = NULL; | |
| 252 Release(); | |
| 253 } | |
| 254 | |
| 255 STDMETHODIMP NativeViewAccessibilityWin::accHitTest( | |
| 256 LONG x_left, LONG y_top, VARIANT* child) { | |
| 257 if (!child) | |
| 258 return E_INVALIDARG; | |
| 259 | |
| 260 if (!view_ || !view_->GetWidget()) | |
| 261 return E_FAIL; | |
| 262 | |
| 263 // If this is a root view, our widget might have child widgets. | |
| 264 // Search child widgets first, since they're on top in the z-order. | |
| 265 if (view_->GetWidget()->GetRootView() == view_) { | |
| 266 std::vector<Widget*> child_widgets; | |
| 267 PopulateChildWidgetVector(&child_widgets); | |
| 268 for (size_t i = 0; i < child_widgets.size(); ++i) { | |
| 269 Widget* child_widget = child_widgets[i]; | |
| 270 IAccessible* child_accessible = | |
| 271 child_widget->GetRootView()->GetNativeViewAccessible(); | |
| 272 HRESULT result = child_accessible->accHitTest(x_left, y_top, child); | |
| 273 if (result == S_OK) | |
| 274 return result; | |
| 275 } | |
| 276 } | |
| 277 | |
| 278 gfx::Point point(x_left, y_top); | |
| 279 View::ConvertPointFromScreen(view_, &point); | |
| 280 | |
| 281 // If the point is not inside this view, return false. | |
| 282 if (!view_->HitTestPoint(point)) { | |
| 283 child->vt = VT_EMPTY; | |
| 284 return S_FALSE; | |
| 285 } | |
| 286 | |
| 287 // Check if the point is within any of the immediate children of this | |
| 288 // view. | |
| 289 View* hit_child_view = NULL; | |
| 290 for (int i = view_->child_count() - 1; i >= 0; --i) { | |
| 291 View* child_view = view_->child_at(i); | |
| 292 if (!child_view->visible()) | |
| 293 continue; | |
| 294 | |
| 295 gfx::Point point_in_child_coords(point); | |
| 296 view_->ConvertPointToTarget(view_, child_view, &point_in_child_coords); | |
| 297 if (child_view->HitTestPoint(point_in_child_coords)) { | |
| 298 hit_child_view = child_view; | |
| 299 break; | |
| 300 } | |
| 301 } | |
| 302 | |
| 303 // If the point was within one of this view's immediate children, | |
| 304 // call accHitTest recursively on that child's native view accessible - | |
| 305 // which may be a recursive call to this function or it may be overridden, | |
| 306 // for example in the case of a WebView. | |
| 307 if (hit_child_view) { | |
| 308 HRESULT result = hit_child_view->GetNativeViewAccessible()->accHitTest( | |
| 309 x_left, y_top, child); | |
| 310 | |
| 311 // If the recursive call returned CHILDID_SELF, we have to convert that | |
| 312 // into a VT_DISPATCH for the return value to this call. | |
| 313 if (S_OK == result && child->vt == VT_I4 && child->lVal == CHILDID_SELF) { | |
| 314 child->vt = VT_DISPATCH; | |
| 315 child->pdispVal = hit_child_view->GetNativeViewAccessible(); | |
| 316 // Always increment ref when returning a reference to a COM object. | |
| 317 child->pdispVal->AddRef(); | |
| 318 } | |
| 319 return result; | |
| 320 } | |
| 321 | |
| 322 // This object is the best match, so return CHILDID_SELF. It's tempting to | |
| 323 // simplify the logic and use VT_DISPATCH everywhere, but the Windows | |
| 324 // call AccessibleObjectFromPoint will keep calling accHitTest until some | |
| 325 // object returns CHILDID_SELF. | |
| 326 child->vt = VT_I4; | |
| 327 child->lVal = CHILDID_SELF; | |
| 328 return S_OK; | |
| 329 } | |
| 330 | |
| 331 HRESULT NativeViewAccessibilityWin::accDoDefaultAction(VARIANT var_id) { | |
| 332 if (!IsValidId(var_id)) | |
| 333 return E_INVALIDARG; | |
| 334 | |
| 335 // The object does not support the method. This value is returned for | |
| 336 // controls that do not perform actions, such as edit fields. | |
| 337 return DISP_E_MEMBERNOTFOUND; | |
| 338 } | |
| 339 | |
| 340 STDMETHODIMP NativeViewAccessibilityWin::accLocation( | |
| 341 LONG* x_left, LONG* y_top, LONG* width, LONG* height, VARIANT var_id) { | |
| 342 if (!IsValidId(var_id) || !x_left || !y_top || !width || !height) | |
| 343 return E_INVALIDARG; | |
| 344 | |
| 345 if (!view_) | |
| 346 return E_FAIL; | |
| 347 | |
| 348 if (!view_->bounds().IsEmpty()) { | |
| 349 *width = view_->width(); | |
| 350 *height = view_->height(); | |
| 351 gfx::Point topleft(view_->bounds().origin()); | |
| 352 View::ConvertPointToScreen( | |
| 353 view_->parent() ? view_->parent() : view_, &topleft); | |
| 354 *x_left = topleft.x(); | |
| 355 *y_top = topleft.y(); | |
| 356 } else { | |
| 357 return E_FAIL; | |
| 358 } | |
| 359 return S_OK; | |
| 360 } | |
| 361 | |
| 362 STDMETHODIMP NativeViewAccessibilityWin::accNavigate( | |
| 363 LONG nav_dir, VARIANT start, VARIANT* end) { | |
| 364 if (start.vt != VT_I4 || !end) | |
| 365 return E_INVALIDARG; | |
| 366 | |
| 367 if (!view_) | |
| 368 return E_FAIL; | |
| 369 | |
| 370 switch (nav_dir) { | |
| 371 case NAVDIR_FIRSTCHILD: | |
| 372 case NAVDIR_LASTCHILD: { | |
| 373 if (start.lVal != CHILDID_SELF) { | |
| 374 // Start of navigation must be on the View itself. | |
| 375 return E_INVALIDARG; | |
| 376 } else if (!view_->has_children()) { | |
| 377 // No children found. | |
| 378 return S_FALSE; | |
| 379 } | |
| 380 | |
| 381 // Set child_id based on first or last child. | |
| 382 int child_id = 0; | |
| 383 if (nav_dir == NAVDIR_LASTCHILD) | |
| 384 child_id = view_->child_count() - 1; | |
| 385 | |
| 386 View* child = view_->child_at(child_id); | |
| 387 end->vt = VT_DISPATCH; | |
| 388 end->pdispVal = child->GetNativeViewAccessible(); | |
| 389 end->pdispVal->AddRef(); | |
| 390 return S_OK; | |
| 391 } | |
| 392 case NAVDIR_LEFT: | |
| 393 case NAVDIR_UP: | |
| 394 case NAVDIR_PREVIOUS: | |
| 395 case NAVDIR_RIGHT: | |
| 396 case NAVDIR_DOWN: | |
| 397 case NAVDIR_NEXT: { | |
| 398 // Retrieve parent to access view index and perform bounds checking. | |
| 399 View* parent = view_->parent(); | |
| 400 if (!parent) { | |
| 401 return E_FAIL; | |
| 402 } | |
| 403 | |
| 404 if (start.lVal == CHILDID_SELF) { | |
| 405 int view_index = parent->GetIndexOf(view_); | |
| 406 // Check navigation bounds, adjusting for View child indexing (MSAA | |
| 407 // child indexing starts with 1, whereas View indexing starts with 0). | |
| 408 if (!IsValidNav(nav_dir, view_index, -1, | |
| 409 parent->child_count() - 1)) { | |
| 410 // Navigation attempted to go out-of-bounds. | |
| 411 end->vt = VT_EMPTY; | |
| 412 return S_FALSE; | |
| 413 } else { | |
| 414 if (IsNavDirNext(nav_dir)) { | |
| 415 view_index += 1; | |
| 416 } else { | |
| 417 view_index -=1; | |
| 418 } | |
| 419 } | |
| 420 | |
| 421 View* child = parent->child_at(view_index); | |
| 422 end->pdispVal = child->GetNativeViewAccessible(); | |
| 423 end->vt = VT_DISPATCH; | |
| 424 end->pdispVal->AddRef(); | |
| 425 return S_OK; | |
| 426 } else { | |
| 427 // Check navigation bounds, adjusting for MSAA child indexing (MSAA | |
| 428 // child indexing starts with 1, whereas View indexing starts with 0). | |
| 429 if (!IsValidNav(nav_dir, start.lVal, 0, parent->child_count() + 1)) { | |
| 430 // Navigation attempted to go out-of-bounds. | |
| 431 end->vt = VT_EMPTY; | |
| 432 return S_FALSE; | |
| 433 } else { | |
| 434 if (IsNavDirNext(nav_dir)) { | |
| 435 start.lVal += 1; | |
| 436 } else { | |
| 437 start.lVal -= 1; | |
| 438 } | |
| 439 } | |
| 440 | |
| 441 HRESULT result = this->get_accChild(start, &end->pdispVal); | |
| 442 if (result == S_FALSE) { | |
| 443 // Child is a leaf. | |
| 444 end->vt = VT_I4; | |
| 445 end->lVal = start.lVal; | |
| 446 } else if (result == E_INVALIDARG) { | |
| 447 return E_INVALIDARG; | |
| 448 } else { | |
| 449 // Child is not a leaf. | |
| 450 end->vt = VT_DISPATCH; | |
| 451 } | |
| 452 } | |
| 453 break; | |
| 454 } | |
| 455 default: | |
| 456 return E_INVALIDARG; | |
| 457 } | |
| 458 // Navigation performed correctly. Global return for this function, if no | |
| 459 // error triggered an escape earlier. | |
| 460 return S_OK; | |
| 461 } | |
| 462 | |
| 463 STDMETHODIMP NativeViewAccessibilityWin::get_accChild(VARIANT var_child, | |
| 464 IDispatch** disp_child) { | |
| 465 if (var_child.vt != VT_I4 || !disp_child) | |
| 466 return E_INVALIDARG; | |
| 467 | |
| 468 if (!view_ || !view_->GetWidget()) | |
| 469 return E_FAIL; | |
| 470 | |
| 471 LONG child_id = V_I4(&var_child); | |
| 472 | |
| 473 if (child_id == CHILDID_SELF) { | |
| 474 // Remain with the same dispatch. | |
| 475 return S_OK; | |
| 476 } | |
| 477 | |
| 478 // If this is a root view, our widget might have child widgets. Include | |
| 479 std::vector<Widget*> child_widgets; | |
| 480 if (view_->GetWidget()->GetRootView() == view_) | |
| 481 PopulateChildWidgetVector(&child_widgets); | |
| 482 int child_widget_count = static_cast<int>(child_widgets.size()); | |
| 483 | |
| 484 View* child_view = NULL; | |
| 485 if (child_id > 0) { | |
| 486 // Positive child ids are a 1-based child index, used by clients | |
| 487 // that want to enumerate all immediate children. | |
| 488 int child_id_as_index = child_id - 1; | |
| 489 if (child_id_as_index < view_->child_count()) { | |
| 490 child_view = view_->child_at(child_id_as_index); | |
| 491 } else if (child_id_as_index < view_->child_count() + child_widget_count) { | |
| 492 Widget* child_widget = | |
| 493 child_widgets[child_id_as_index - view_->child_count()]; | |
| 494 child_view = child_widget->GetRootView(); | |
| 495 } | |
| 496 } else { | |
| 497 // Negative child ids can be used to map to any descendant. | |
| 498 // Check child widget first. | |
| 499 for (int i = 0; i < child_widget_count; i++) { | |
| 500 Widget* child_widget = child_widgets[i]; | |
| 501 IAccessible* child_accessible = | |
| 502 child_widget->GetRootView()->GetNativeViewAccessible(); | |
| 503 HRESULT result = child_accessible->get_accChild(var_child, disp_child); | |
| 504 if (result == S_OK) | |
| 505 return result; | |
| 506 } | |
| 507 | |
| 508 // We map child ids to a view storage id that can refer to a | |
| 509 // specific view (if that view still exists). | |
| 510 int view_storage_id_index = | |
| 511 base::win::kFirstViewsAccessibilityId - child_id; | |
| 512 if (view_storage_id_index >= 0 && | |
| 513 view_storage_id_index < kMaxViewStorageIds) { | |
| 514 int view_storage_id = view_storage_ids_[view_storage_id_index]; | |
| 515 ViewStorage* view_storage = ViewStorage::GetInstance(); | |
| 516 child_view = view_storage->RetrieveView(view_storage_id); | |
| 517 } else { | |
| 518 *disp_child = AccessibleWebViewRegistry::GetInstance()-> | |
| 519 GetAccessibleFromWebView(view_, child_id); | |
| 520 if (*disp_child) | |
| 521 return S_OK; | |
| 522 } | |
| 523 } | |
| 524 | |
| 525 if (!child_view) { | |
| 526 // No child found. | |
| 527 *disp_child = NULL; | |
| 528 return E_FAIL; | |
| 529 } | |
| 530 | |
| 531 *disp_child = child_view->GetNativeViewAccessible(); | |
| 532 if (*disp_child) { | |
| 533 (*disp_child)->AddRef(); | |
| 534 return S_OK; | |
| 535 } | |
| 536 | |
| 537 return E_FAIL; | |
| 538 } | |
| 539 | |
| 540 STDMETHODIMP NativeViewAccessibilityWin::get_accChildCount(LONG* child_count) { | |
| 541 if (!child_count) | |
| 542 return E_INVALIDARG; | |
| 543 | |
| 544 if (!view_ || !view_->GetWidget()) | |
| 545 return E_FAIL; | |
| 546 | |
| 547 *child_count = view_->child_count(); | |
| 548 | |
| 549 // If this is a root view, our widget might have child widgets. Include | |
| 550 // them, too. | |
| 551 if (view_->GetWidget()->GetRootView() == view_) { | |
| 552 std::vector<Widget*> child_widgets; | |
| 553 PopulateChildWidgetVector(&child_widgets); | |
| 554 *child_count += child_widgets.size(); | |
| 555 } | |
| 556 | |
| 557 return S_OK; | |
| 558 } | |
| 559 | |
| 560 STDMETHODIMP NativeViewAccessibilityWin::get_accDefaultAction( | |
| 561 VARIANT var_id, BSTR* def_action) { | |
| 562 if (!IsValidId(var_id) || !def_action) | |
| 563 return E_INVALIDARG; | |
| 564 | |
| 565 if (!view_) | |
| 566 return E_FAIL; | |
| 567 | |
| 568 ui::AXViewState state; | |
| 569 view_->GetAccessibleState(&state); | |
| 570 base::string16 temp_action = state.default_action; | |
| 571 | |
| 572 if (!temp_action.empty()) { | |
| 573 *def_action = SysAllocString(temp_action.c_str()); | |
| 574 } else { | |
| 575 return S_FALSE; | |
| 576 } | |
| 577 | |
| 578 return S_OK; | |
| 579 } | |
| 580 | |
| 581 STDMETHODIMP NativeViewAccessibilityWin::get_accDescription( | |
| 582 VARIANT var_id, BSTR* desc) { | |
| 583 if (!IsValidId(var_id) || !desc) | |
| 584 return E_INVALIDARG; | |
| 585 | |
| 586 if (!view_) | |
| 587 return E_FAIL; | |
| 588 | |
| 589 base::string16 temp_desc; | |
| 590 | |
| 591 view_->GetTooltipText(gfx::Point(), &temp_desc); | |
| 592 if (!temp_desc.empty()) { | |
| 593 *desc = SysAllocString(temp_desc.c_str()); | |
| 594 } else { | |
| 595 return S_FALSE; | |
| 596 } | |
| 597 | |
| 598 return S_OK; | |
| 599 } | |
| 600 | |
| 601 STDMETHODIMP NativeViewAccessibilityWin::get_accFocus(VARIANT* focus_child) { | |
| 602 if (!focus_child) | |
| 603 return E_INVALIDARG; | |
| 604 | |
| 605 if (!view_) | |
| 606 return E_FAIL; | |
| 607 | |
| 608 FocusManager* focus_manager = view_->GetFocusManager(); | |
| 609 View* focus = focus_manager ? focus_manager->GetFocusedView() : NULL; | |
| 610 if (focus == view_) { | |
| 611 // This view has focus. | |
| 612 focus_child->vt = VT_I4; | |
| 613 focus_child->lVal = CHILDID_SELF; | |
| 614 } else if (focus && view_->Contains(focus)) { | |
| 615 // Return the child object that has the keyboard focus. | |
| 616 focus_child->vt = VT_DISPATCH; | |
| 617 focus_child->pdispVal = focus->GetNativeViewAccessible(); | |
| 618 focus_child->pdispVal->AddRef(); | |
| 619 return S_OK; | |
| 620 } else { | |
| 621 // Neither this object nor any of its children has the keyboard focus. | |
| 622 focus_child->vt = VT_EMPTY; | |
| 623 } | |
| 624 return S_OK; | |
| 625 } | |
| 626 | |
| 627 STDMETHODIMP NativeViewAccessibilityWin::get_accKeyboardShortcut( | |
| 628 VARIANT var_id, BSTR* acc_key) { | |
| 629 if (!IsValidId(var_id) || !acc_key) | |
| 630 return E_INVALIDARG; | |
| 631 | |
| 632 if (!view_) | |
| 633 return E_FAIL; | |
| 634 | |
| 635 ui::AXViewState state; | |
| 636 view_->GetAccessibleState(&state); | |
| 637 base::string16 temp_key = state.keyboard_shortcut; | |
| 638 | |
| 639 if (!temp_key.empty()) { | |
| 640 *acc_key = SysAllocString(temp_key.c_str()); | |
| 641 } else { | |
| 642 return S_FALSE; | |
| 643 } | |
| 644 | |
| 645 return S_OK; | |
| 646 } | |
| 647 | |
| 648 STDMETHODIMP NativeViewAccessibilityWin::get_accName( | |
| 649 VARIANT var_id, BSTR* name) { | |
| 650 if (!IsValidId(var_id) || !name) | |
| 651 return E_INVALIDARG; | |
| 652 | |
| 653 if (!view_) | |
| 654 return E_FAIL; | |
| 655 | |
| 656 // Retrieve the current view's name. | |
| 657 ui::AXViewState state; | |
| 658 view_->GetAccessibleState(&state); | |
| 659 base::string16 temp_name = state.name; | |
| 660 if (!temp_name.empty()) { | |
| 661 // Return name retrieved. | |
| 662 *name = SysAllocString(temp_name.c_str()); | |
| 663 } else { | |
| 664 // If view has no name, return S_FALSE. | |
| 665 return S_FALSE; | |
| 666 } | |
| 667 | |
| 668 return S_OK; | |
| 669 } | |
| 670 | |
| 671 STDMETHODIMP NativeViewAccessibilityWin::get_accParent( | |
| 672 IDispatch** disp_parent) { | |
| 673 if (!disp_parent) | |
| 674 return E_INVALIDARG; | |
| 675 | |
| 676 if (!view_) | |
| 677 return E_FAIL; | |
| 678 | |
| 679 *disp_parent = NULL; | |
| 680 View* parent_view = view_->parent(); | |
| 681 | |
| 682 if (!parent_view) { | |
| 683 HWND hwnd = HWNDForView(view_); | |
| 684 if (!hwnd) | |
| 685 return S_FALSE; | |
| 686 | |
| 687 return ::AccessibleObjectFromWindow( | |
| 688 hwnd, OBJID_WINDOW, IID_IAccessible, | |
| 689 reinterpret_cast<void**>(disp_parent)); | |
| 690 } | |
| 691 | |
| 692 *disp_parent = parent_view->GetNativeViewAccessible(); | |
| 693 (*disp_parent)->AddRef(); | |
| 694 return S_OK; | |
| 695 } | |
| 696 | |
| 697 STDMETHODIMP NativeViewAccessibilityWin::get_accRole( | |
| 698 VARIANT var_id, VARIANT* role) { | |
| 699 if (!IsValidId(var_id) || !role) | |
| 700 return E_INVALIDARG; | |
| 701 | |
| 702 if (!view_) | |
| 703 return E_FAIL; | |
| 704 | |
| 705 ui::AXViewState state; | |
| 706 view_->GetAccessibleState(&state); | |
| 707 role->vt = VT_I4; | |
| 708 role->lVal = MSAARole(state.role); | |
| 709 return S_OK; | |
| 710 } | |
| 711 | |
| 712 STDMETHODIMP NativeViewAccessibilityWin::get_accState( | |
| 713 VARIANT var_id, VARIANT* state) { | |
| 714 // This returns MSAA states. See also the IAccessible2 interface | |
| 715 // get_states(). | |
| 716 | |
| 717 if (!IsValidId(var_id) || !state) | |
| 718 return E_INVALIDARG; | |
| 719 | |
| 720 if (!view_) | |
| 721 return E_FAIL; | |
| 722 | |
| 723 state->vt = VT_I4; | |
| 724 | |
| 725 // Retrieve all currently applicable states of the parent. | |
| 726 SetState(state, view_); | |
| 727 | |
| 728 // Make sure that state is not empty, and has the proper type. | |
| 729 if (state->vt == VT_EMPTY) | |
| 730 return E_FAIL; | |
| 731 | |
| 732 return S_OK; | |
| 733 } | |
| 734 | |
| 735 STDMETHODIMP NativeViewAccessibilityWin::get_accValue(VARIANT var_id, | |
| 736 BSTR* value) { | |
| 737 if (!IsValidId(var_id) || !value) | |
| 738 return E_INVALIDARG; | |
| 739 | |
| 740 if (!view_) | |
| 741 return E_FAIL; | |
| 742 | |
| 743 // Retrieve the current view's value. | |
| 744 ui::AXViewState state; | |
| 745 view_->GetAccessibleState(&state); | |
| 746 base::string16 temp_value = state.value; | |
| 747 | |
| 748 if (!temp_value.empty()) { | |
| 749 // Return value retrieved. | |
| 750 *value = SysAllocString(temp_value.c_str()); | |
| 751 } else { | |
| 752 // If view has no value, fall back into the default implementation. | |
| 753 *value = NULL; | |
| 754 return E_NOTIMPL; | |
| 755 } | |
| 756 | |
| 757 return S_OK; | |
| 758 } | |
| 759 | |
| 760 STDMETHODIMP NativeViewAccessibilityWin::put_accValue(VARIANT var_id, | |
| 761 BSTR new_value) { | |
| 762 if (!IsValidId(var_id) || !new_value) | |
| 763 return E_INVALIDARG; | |
| 764 | |
| 765 if (!view_) | |
| 766 return E_FAIL; | |
| 767 | |
| 768 // Return an error if the view can't set the value. | |
| 769 ui::AXViewState state; | |
| 770 view_->GetAccessibleState(&state); | |
| 771 if (state.set_value_callback.is_null()) | |
| 772 return E_FAIL; | |
| 773 | |
| 774 state.set_value_callback.Run(new_value); | |
| 775 return S_OK; | |
| 776 } | |
| 777 | |
| 778 // IAccessible functions not supported. | |
| 779 | |
| 780 STDMETHODIMP NativeViewAccessibilityWin::get_accSelection(VARIANT* selected) { | |
| 781 if (selected) | |
| 782 selected->vt = VT_EMPTY; | |
| 783 return E_NOTIMPL; | |
| 784 } | |
| 785 | |
| 786 STDMETHODIMP NativeViewAccessibilityWin::accSelect( | |
| 787 LONG flagsSelect, VARIANT var_id) { | |
| 788 return E_NOTIMPL; | |
| 789 } | |
| 790 | |
| 791 STDMETHODIMP NativeViewAccessibilityWin::get_accHelp( | |
| 792 VARIANT var_id, BSTR* help) { | |
| 793 base::string16 temp = base::UTF8ToUTF16(view_->GetClassName()); | |
| 794 *help = SysAllocString(temp.c_str()); | |
| 795 return S_OK; | |
| 796 } | |
| 797 | |
| 798 STDMETHODIMP NativeViewAccessibilityWin::get_accHelpTopic( | |
| 799 BSTR* help_file, VARIANT var_id, LONG* topic_id) { | |
| 800 if (help_file) { | |
| 801 *help_file = NULL; | |
| 802 } | |
| 803 if (topic_id) { | |
| 804 *topic_id = static_cast<LONG>(-1); | |
| 805 } | |
| 806 return E_NOTIMPL; | |
| 807 } | |
| 808 | |
| 809 STDMETHODIMP NativeViewAccessibilityWin::put_accName( | |
| 810 VARIANT var_id, BSTR put_name) { | |
| 811 // Deprecated. | |
| 812 return E_NOTIMPL; | |
| 813 } | |
| 814 | |
| 815 // | |
| 816 // IAccessible2 | |
| 817 // | |
| 818 | |
| 819 STDMETHODIMP NativeViewAccessibilityWin::role(LONG* role) { | |
| 820 if (!view_) | |
| 821 return E_FAIL; | |
| 822 | |
| 823 if (!role) | |
| 824 return E_INVALIDARG; | |
| 825 | |
| 826 ui::AXViewState state; | |
| 827 view_->GetAccessibleState(&state); | |
| 828 *role = MSAARole(state.role); | |
| 829 return S_OK; | |
| 830 } | |
| 831 | |
| 832 STDMETHODIMP NativeViewAccessibilityWin::get_states(AccessibleStates* states) { | |
| 833 // This returns IAccessible2 states, which supplement MSAA states. | |
| 834 // See also the MSAA interface get_accState. | |
| 835 | |
| 836 if (!view_) | |
| 837 return E_FAIL; | |
| 838 | |
| 839 if (!states) | |
| 840 return E_INVALIDARG; | |
| 841 | |
| 842 ui::AXViewState state; | |
| 843 view_->GetAccessibleState(&state); | |
| 844 | |
| 845 // There are only a couple of states we need to support | |
| 846 // in IAccessible2. If any more are added, we may want to | |
| 847 // add a helper function like MSAAState. | |
| 848 *states = IA2_STATE_OPAQUE; | |
| 849 if (state.HasStateFlag(ui::AX_STATE_EDITABLE)) | |
| 850 *states |= IA2_STATE_EDITABLE; | |
| 851 | |
| 852 return S_OK; | |
| 853 } | |
| 854 | |
| 855 STDMETHODIMP NativeViewAccessibilityWin::get_uniqueID(LONG* unique_id) { | |
| 856 if (!view_) | |
| 857 return E_FAIL; | |
| 858 | |
| 859 if (!unique_id) | |
| 860 return E_INVALIDARG; | |
| 861 | |
| 862 *unique_id = unique_id_; | |
| 863 return S_OK; | |
| 864 } | |
| 865 | |
| 866 STDMETHODIMP NativeViewAccessibilityWin::get_windowHandle(HWND* window_handle) { | |
| 867 if (!view_) | |
| 868 return E_FAIL; | |
| 869 | |
| 870 if (!window_handle) | |
| 871 return E_INVALIDARG; | |
| 872 | |
| 873 *window_handle = HWNDForView(view_); | |
| 874 return *window_handle ? S_OK : S_FALSE; | |
| 875 } | |
| 876 | |
| 877 STDMETHODIMP NativeViewAccessibilityWin::get_relationTargetsOfType( | |
| 878 BSTR type_bstr, | |
| 879 long max_targets, | |
| 880 IUnknown ***targets, | |
| 881 long *n_targets) { | |
| 882 if (!view_) | |
| 883 return E_FAIL; | |
| 884 | |
| 885 if (!targets || !n_targets) | |
| 886 return E_INVALIDARG; | |
| 887 | |
| 888 *n_targets = 0; | |
| 889 *targets = NULL; | |
| 890 | |
| 891 // Only respond to requests for relations of type "alerts" on the | |
| 892 // root view. | |
| 893 base::string16 type(type_bstr); | |
| 894 if (type != L"alerts" || view_->parent()) | |
| 895 return S_FALSE; | |
| 896 | |
| 897 // Collect all of the alert views that are still valid. | |
| 898 std::vector<View*> alert_views; | |
| 899 ViewStorage* view_storage = ViewStorage::GetInstance(); | |
| 900 for (size_t i = 0; i < alert_target_view_storage_ids_.size(); ++i) { | |
| 901 int view_storage_id = alert_target_view_storage_ids_[i]; | |
| 902 View* view = view_storage->RetrieveView(view_storage_id); | |
| 903 if (!view || !view_->Contains(view)) | |
| 904 continue; | |
| 905 alert_views.push_back(view); | |
| 906 } | |
| 907 | |
| 908 long count = alert_views.size(); | |
| 909 if (count == 0) | |
| 910 return S_FALSE; | |
| 911 | |
| 912 // Don't return more targets than max_targets - but note that the caller | |
| 913 // is allowed to specify max_targets=0 to mean no limit. | |
| 914 if (max_targets > 0 && count > max_targets) | |
| 915 count = max_targets; | |
| 916 | |
| 917 // Return the number of targets. | |
| 918 *n_targets = count; | |
| 919 | |
| 920 // Allocate COM memory for the result array and populate it. | |
| 921 *targets = static_cast<IUnknown**>( | |
| 922 CoTaskMemAlloc(count * sizeof(IUnknown*))); | |
| 923 for (long i = 0; i < count; ++i) { | |
| 924 (*targets)[i] = alert_views[i]->GetNativeViewAccessible(); | |
| 925 (*targets)[i]->AddRef(); | |
| 926 } | |
| 927 return S_OK; | |
| 928 } | |
| 929 | |
| 930 STDMETHODIMP NativeViewAccessibilityWin::get_attributes(BSTR* attributes) { | |
| 931 if (!view_) | |
| 932 return E_FAIL; | |
| 933 | |
| 934 if (!attributes) | |
| 935 return E_INVALIDARG; | |
| 936 | |
| 937 base::string16 attributes_str; | |
| 938 | |
| 939 // Text fields need to report the attribute "text-model:a1" to instruct | |
| 940 // screen readers to use IAccessible2 APIs to handle text editing in this | |
| 941 // object (as opposed to treating it like a native Windows text box). | |
| 942 // The text-model:a1 attribute is documented here: | |
| 943 // http://www.linuxfoundation.org/collaborate/workgroups/accessibility/ia2/ia2
_implementation_guide | |
| 944 ui::AXViewState state; | |
| 945 view_->GetAccessibleState(&state); | |
| 946 if (state.role == ui::AX_ROLE_TEXT_FIELD) { | |
| 947 attributes_str = L"text-model:a1;"; | |
| 948 } | |
| 949 | |
| 950 *attributes = SysAllocString(attributes_str.c_str()); | |
| 951 DCHECK(*attributes); | |
| 952 return S_OK; | |
| 953 } | |
| 954 | |
| 955 // | |
| 956 // IAccessibleText | |
| 957 // | |
| 958 | |
| 959 STDMETHODIMP NativeViewAccessibilityWin::get_nCharacters(LONG* n_characters) { | |
| 960 if (!view_) | |
| 961 return E_FAIL; | |
| 962 | |
| 963 if (!n_characters) | |
| 964 return E_INVALIDARG; | |
| 965 | |
| 966 base::string16 text = TextForIAccessibleText(); | |
| 967 *n_characters = static_cast<LONG>(text.size()); | |
| 968 return S_OK; | |
| 969 } | |
| 970 | |
| 971 STDMETHODIMP NativeViewAccessibilityWin::get_caretOffset(LONG* offset) { | |
| 972 if (!view_) | |
| 973 return E_FAIL; | |
| 974 | |
| 975 if (!offset) | |
| 976 return E_INVALIDARG; | |
| 977 | |
| 978 ui::AXViewState state; | |
| 979 view_->GetAccessibleState(&state); | |
| 980 *offset = static_cast<LONG>(state.selection_end); | |
| 981 return S_OK; | |
| 982 } | |
| 983 | |
| 984 STDMETHODIMP NativeViewAccessibilityWin::get_nSelections(LONG* n_selections) { | |
| 985 if (!view_) | |
| 986 return E_FAIL; | |
| 987 | |
| 988 if (!n_selections) | |
| 989 return E_INVALIDARG; | |
| 990 | |
| 991 ui::AXViewState state; | |
| 992 view_->GetAccessibleState(&state); | |
| 993 if (state.selection_start != state.selection_end) | |
| 994 *n_selections = 1; | |
| 995 else | |
| 996 *n_selections = 0; | |
| 997 return S_OK; | |
| 998 } | |
| 999 | |
| 1000 STDMETHODIMP NativeViewAccessibilityWin::get_selection(LONG selection_index, | |
| 1001 LONG* start_offset, | |
| 1002 LONG* end_offset) { | |
| 1003 if (!view_) | |
| 1004 return E_FAIL; | |
| 1005 | |
| 1006 if (!start_offset || !end_offset || selection_index != 0) | |
| 1007 return E_INVALIDARG; | |
| 1008 | |
| 1009 ui::AXViewState state; | |
| 1010 view_->GetAccessibleState(&state); | |
| 1011 *start_offset = static_cast<LONG>(state.selection_start); | |
| 1012 *end_offset = static_cast<LONG>(state.selection_end); | |
| 1013 return S_OK; | |
| 1014 } | |
| 1015 | |
| 1016 STDMETHODIMP NativeViewAccessibilityWin::get_text(LONG start_offset, | |
| 1017 LONG end_offset, | |
| 1018 BSTR* text) { | |
| 1019 if (!view_) | |
| 1020 return E_FAIL; | |
| 1021 | |
| 1022 ui::AXViewState state; | |
| 1023 view_->GetAccessibleState(&state); | |
| 1024 base::string16 text_str = TextForIAccessibleText(); | |
| 1025 LONG len = static_cast<LONG>(text_str.size()); | |
| 1026 | |
| 1027 if (start_offset == IA2_TEXT_OFFSET_LENGTH) { | |
| 1028 start_offset = len; | |
| 1029 } else if (start_offset == IA2_TEXT_OFFSET_CARET) { | |
| 1030 start_offset = static_cast<LONG>(state.selection_end); | |
| 1031 } | |
| 1032 if (end_offset == IA2_TEXT_OFFSET_LENGTH) { | |
| 1033 end_offset = static_cast<LONG>(text_str.size()); | |
| 1034 } else if (end_offset == IA2_TEXT_OFFSET_CARET) { | |
| 1035 end_offset = static_cast<LONG>(state.selection_end); | |
| 1036 } | |
| 1037 | |
| 1038 // The spec allows the arguments to be reversed. | |
| 1039 if (start_offset > end_offset) { | |
| 1040 LONG tmp = start_offset; | |
| 1041 start_offset = end_offset; | |
| 1042 end_offset = tmp; | |
| 1043 } | |
| 1044 | |
| 1045 // The spec does not allow the start or end offsets to be out or range; | |
| 1046 // we must return an error if so. | |
| 1047 if (start_offset < 0) | |
| 1048 return E_INVALIDARG; | |
| 1049 if (end_offset > len) | |
| 1050 return E_INVALIDARG; | |
| 1051 | |
| 1052 base::string16 substr = | |
| 1053 text_str.substr(start_offset, end_offset - start_offset); | |
| 1054 if (substr.empty()) | |
| 1055 return S_FALSE; | |
| 1056 | |
| 1057 *text = SysAllocString(substr.c_str()); | |
| 1058 DCHECK(*text); | |
| 1059 return S_OK; | |
| 1060 } | |
| 1061 | |
| 1062 STDMETHODIMP NativeViewAccessibilityWin::get_textAtOffset( | |
| 1063 LONG offset, | |
| 1064 enum IA2TextBoundaryType boundary_type, | |
| 1065 LONG* start_offset, LONG* end_offset, | |
| 1066 BSTR* text) { | |
| 1067 if (!start_offset || !end_offset || !text) | |
| 1068 return E_INVALIDARG; | |
| 1069 | |
| 1070 // The IAccessible2 spec says we don't have to implement the "sentence" | |
| 1071 // boundary type, we can just let the screenreader handle it. | |
| 1072 if (boundary_type == IA2_TEXT_BOUNDARY_SENTENCE) { | |
| 1073 *start_offset = 0; | |
| 1074 *end_offset = 0; | |
| 1075 *text = NULL; | |
| 1076 return S_FALSE; | |
| 1077 } | |
| 1078 | |
| 1079 const base::string16& text_str = TextForIAccessibleText(); | |
| 1080 | |
| 1081 *start_offset = FindBoundary( | |
| 1082 text_str, boundary_type, offset, ui::BACKWARDS_DIRECTION); | |
| 1083 *end_offset = FindBoundary( | |
| 1084 text_str, boundary_type, offset, ui::FORWARDS_DIRECTION); | |
| 1085 return get_text(*start_offset, *end_offset, text); | |
| 1086 } | |
| 1087 | |
| 1088 STDMETHODIMP NativeViewAccessibilityWin::get_textBeforeOffset( | |
| 1089 LONG offset, | |
| 1090 enum IA2TextBoundaryType boundary_type, | |
| 1091 LONG* start_offset, LONG* end_offset, | |
| 1092 BSTR* text) { | |
| 1093 if (!start_offset || !end_offset || !text) | |
| 1094 return E_INVALIDARG; | |
| 1095 | |
| 1096 // The IAccessible2 spec says we don't have to implement the "sentence" | |
| 1097 // boundary type, we can just let the screenreader handle it. | |
| 1098 if (boundary_type == IA2_TEXT_BOUNDARY_SENTENCE) { | |
| 1099 *start_offset = 0; | |
| 1100 *end_offset = 0; | |
| 1101 *text = NULL; | |
| 1102 return S_FALSE; | |
| 1103 } | |
| 1104 | |
| 1105 const base::string16& text_str = TextForIAccessibleText(); | |
| 1106 | |
| 1107 *start_offset = FindBoundary( | |
| 1108 text_str, boundary_type, offset, ui::BACKWARDS_DIRECTION); | |
| 1109 *end_offset = offset; | |
| 1110 return get_text(*start_offset, *end_offset, text); | |
| 1111 } | |
| 1112 | |
| 1113 STDMETHODIMP NativeViewAccessibilityWin::get_textAfterOffset( | |
| 1114 LONG offset, | |
| 1115 enum IA2TextBoundaryType boundary_type, | |
| 1116 LONG* start_offset, LONG* end_offset, | |
| 1117 BSTR* text) { | |
| 1118 if (!start_offset || !end_offset || !text) | |
| 1119 return E_INVALIDARG; | |
| 1120 | |
| 1121 // The IAccessible2 spec says we don't have to implement the "sentence" | |
| 1122 // boundary type, we can just let the screenreader handle it. | |
| 1123 if (boundary_type == IA2_TEXT_BOUNDARY_SENTENCE) { | |
| 1124 *start_offset = 0; | |
| 1125 *end_offset = 0; | |
| 1126 *text = NULL; | |
| 1127 return S_FALSE; | |
| 1128 } | |
| 1129 | |
| 1130 const base::string16& text_str = TextForIAccessibleText(); | |
| 1131 | |
| 1132 *start_offset = offset; | |
| 1133 *end_offset = FindBoundary( | |
| 1134 text_str, boundary_type, offset, ui::FORWARDS_DIRECTION); | |
| 1135 return get_text(*start_offset, *end_offset, text); | |
| 1136 } | |
| 1137 | |
| 1138 STDMETHODIMP NativeViewAccessibilityWin::get_offsetAtPoint( | |
| 1139 LONG x, LONG y, enum IA2CoordinateType coord_type, LONG* offset) { | |
| 1140 if (!view_) | |
| 1141 return E_FAIL; | |
| 1142 | |
| 1143 if (!offset) | |
| 1144 return E_INVALIDARG; | |
| 1145 | |
| 1146 // We don't support this method, but we have to return something | |
| 1147 // rather than E_NOTIMPL or screen readers will complain. | |
| 1148 *offset = 0; | |
| 1149 return S_OK; | |
| 1150 } | |
| 1151 | |
| 1152 // | |
| 1153 // IServiceProvider methods. | |
| 1154 // | |
| 1155 | |
| 1156 STDMETHODIMP NativeViewAccessibilityWin::QueryService( | |
| 1157 REFGUID guidService, REFIID riid, void** object) { | |
| 1158 if (!view_) | |
| 1159 return E_FAIL; | |
| 1160 | |
| 1161 if (riid == IID_IAccessible2 || riid == IID_IAccessible2_2) | |
| 1162 AccessibleWebViewRegistry::GetInstance()->EnableIAccessible2Support(); | |
| 1163 | |
| 1164 if (guidService == IID_IAccessible || | |
| 1165 guidService == IID_IAccessible2 || | |
| 1166 guidService == IID_IAccessible2_2 || | |
| 1167 guidService == IID_IAccessibleText) { | |
| 1168 return QueryInterface(riid, object); | |
| 1169 } | |
| 1170 | |
| 1171 // We only support the IAccessibleEx interface on Windows 8 and above. This | |
| 1172 // is needed for the On screen Keyboard to show up in metro mode, when the | |
| 1173 // user taps an editable region in the window. | |
| 1174 // All methods in the IAccessibleEx interface are unimplemented. | |
| 1175 if (riid == IID_IAccessibleEx && | |
| 1176 base::win::GetVersion() >= base::win::VERSION_WIN8) { | |
| 1177 return QueryInterface(riid, object); | |
| 1178 } | |
| 1179 | |
| 1180 *object = NULL; | |
| 1181 return E_FAIL; | |
| 1182 } | |
| 1183 | |
| 1184 STDMETHODIMP NativeViewAccessibilityWin::GetPatternProvider( | |
| 1185 PATTERNID id, IUnknown** provider) { | |
| 1186 DVLOG(1) << "In Function: " | |
| 1187 << __FUNCTION__ | |
| 1188 << " for pattern id: " | |
| 1189 << id; | |
| 1190 if (id == UIA_ValuePatternId || id == UIA_TextPatternId) { | |
| 1191 ui::AXViewState state; | |
| 1192 view_->GetAccessibleState(&state); | |
| 1193 long role = MSAARole(state.role); | |
| 1194 | |
| 1195 if (role == ROLE_SYSTEM_TEXT) { | |
| 1196 DVLOG(1) << "Returning UIA text provider"; | |
| 1197 base::win::UIATextProvider::CreateTextProvider( | |
| 1198 state.value, true, provider); | |
| 1199 return S_OK; | |
| 1200 } | |
| 1201 } | |
| 1202 return E_NOTIMPL; | |
| 1203 } | |
| 1204 | |
| 1205 STDMETHODIMP NativeViewAccessibilityWin::GetPropertyValue(PROPERTYID id, | |
| 1206 VARIANT* ret) { | |
| 1207 DVLOG(1) << "In Function: " | |
| 1208 << __FUNCTION__ | |
| 1209 << " for property id: " | |
| 1210 << id; | |
| 1211 if (id == UIA_ControlTypePropertyId) { | |
| 1212 ui::AXViewState state; | |
| 1213 view_->GetAccessibleState(&state); | |
| 1214 long role = MSAARole(state.role); | |
| 1215 if (role == ROLE_SYSTEM_TEXT) { | |
| 1216 V_VT(ret) = VT_I4; | |
| 1217 ret->lVal = UIA_EditControlTypeId; | |
| 1218 DVLOG(1) << "Returning Edit control type"; | |
| 1219 } else { | |
| 1220 DVLOG(1) << "Returning empty control type"; | |
| 1221 V_VT(ret) = VT_EMPTY; | |
| 1222 } | |
| 1223 } else { | |
| 1224 V_VT(ret) = VT_EMPTY; | |
| 1225 } | |
| 1226 return S_OK; | |
| 1227 } | |
| 1228 | |
| 1229 // | |
| 1230 // Static methods. | |
| 1231 // | |
| 1232 | |
| 1233 void NativeViewAccessibility::RegisterWebView(View* web_view) { | |
| 1234 AccessibleWebViewRegistry::GetInstance()->RegisterWebView(web_view); | |
| 1235 } | |
| 1236 | |
| 1237 void NativeViewAccessibility::UnregisterWebView(View* web_view) { | |
| 1238 AccessibleWebViewRegistry::GetInstance()->UnregisterWebView(web_view); | |
| 1239 } | |
| 1240 | |
| 1241 int32 NativeViewAccessibilityWin::MSAAEvent(ui::AXEvent event) { | |
| 1242 switch (event) { | |
| 1243 case ui::AX_EVENT_ALERT: | |
| 1244 return EVENT_SYSTEM_ALERT; | |
| 1245 case ui::AX_EVENT_FOCUS: | |
| 1246 return EVENT_OBJECT_FOCUS; | |
| 1247 case ui::AX_EVENT_MENU_START: | |
| 1248 return EVENT_SYSTEM_MENUSTART; | |
| 1249 case ui::AX_EVENT_MENU_END: | |
| 1250 return EVENT_SYSTEM_MENUEND; | |
| 1251 case ui::AX_EVENT_MENU_POPUP_START: | |
| 1252 return EVENT_SYSTEM_MENUPOPUPSTART; | |
| 1253 case ui::AX_EVENT_MENU_POPUP_END: | |
| 1254 return EVENT_SYSTEM_MENUPOPUPEND; | |
| 1255 case ui::AX_EVENT_SELECTION: | |
| 1256 return EVENT_OBJECT_SELECTION; | |
| 1257 case ui::AX_EVENT_SELECTION_ADD: | |
| 1258 return EVENT_OBJECT_SELECTIONADD; | |
| 1259 case ui::AX_EVENT_SELECTION_REMOVE: | |
| 1260 return EVENT_OBJECT_SELECTIONREMOVE; | |
| 1261 case ui::AX_EVENT_TEXT_CHANGED: | |
| 1262 return EVENT_OBJECT_NAMECHANGE; | |
| 1263 case ui::AX_EVENT_TEXT_SELECTION_CHANGED: | |
| 1264 return IA2_EVENT_TEXT_CARET_MOVED; | |
| 1265 case ui::AX_EVENT_VALUE_CHANGED: | |
| 1266 return EVENT_OBJECT_VALUECHANGE; | |
| 1267 default: | |
| 1268 // Not supported or invalid event. | |
| 1269 NOTREACHED(); | |
| 1270 return -1; | |
| 1271 } | |
| 1272 } | |
| 1273 | |
| 1274 int32 NativeViewAccessibilityWin::MSAARole(ui::AXRole role) { | |
| 1275 switch (role) { | |
| 1276 case ui::AX_ROLE_ALERT: | |
| 1277 return ROLE_SYSTEM_ALERT; | |
| 1278 case ui::AX_ROLE_APPLICATION: | |
| 1279 return ROLE_SYSTEM_APPLICATION; | |
| 1280 case ui::AX_ROLE_BUTTON_DROP_DOWN: | |
| 1281 return ROLE_SYSTEM_BUTTONDROPDOWN; | |
| 1282 case ui::AX_ROLE_POP_UP_BUTTON: | |
| 1283 return ROLE_SYSTEM_BUTTONMENU; | |
| 1284 case ui::AX_ROLE_CHECK_BOX: | |
| 1285 return ROLE_SYSTEM_CHECKBUTTON; | |
| 1286 case ui::AX_ROLE_COMBO_BOX: | |
| 1287 return ROLE_SYSTEM_COMBOBOX; | |
| 1288 case ui::AX_ROLE_DIALOG: | |
| 1289 return ROLE_SYSTEM_DIALOG; | |
| 1290 case ui::AX_ROLE_GROUP: | |
| 1291 return ROLE_SYSTEM_GROUPING; | |
| 1292 case ui::AX_ROLE_IMAGE: | |
| 1293 return ROLE_SYSTEM_GRAPHIC; | |
| 1294 case ui::AX_ROLE_LINK: | |
| 1295 return ROLE_SYSTEM_LINK; | |
| 1296 case ui::AX_ROLE_LOCATION_BAR: | |
| 1297 return ROLE_SYSTEM_GROUPING; | |
| 1298 case ui::AX_ROLE_MENU_BAR: | |
| 1299 return ROLE_SYSTEM_MENUBAR; | |
| 1300 case ui::AX_ROLE_MENU_ITEM: | |
| 1301 return ROLE_SYSTEM_MENUITEM; | |
| 1302 case ui::AX_ROLE_MENU_LIST_POPUP: | |
| 1303 return ROLE_SYSTEM_MENUPOPUP; | |
| 1304 case ui::AX_ROLE_TREE: | |
| 1305 return ROLE_SYSTEM_OUTLINE; | |
| 1306 case ui::AX_ROLE_TREE_ITEM: | |
| 1307 return ROLE_SYSTEM_OUTLINEITEM; | |
| 1308 case ui::AX_ROLE_TAB: | |
| 1309 return ROLE_SYSTEM_PAGETAB; | |
| 1310 case ui::AX_ROLE_TAB_LIST: | |
| 1311 return ROLE_SYSTEM_PAGETABLIST; | |
| 1312 case ui::AX_ROLE_PANE: | |
| 1313 return ROLE_SYSTEM_PANE; | |
| 1314 case ui::AX_ROLE_PROGRESS_INDICATOR: | |
| 1315 return ROLE_SYSTEM_PROGRESSBAR; | |
| 1316 case ui::AX_ROLE_BUTTON: | |
| 1317 return ROLE_SYSTEM_PUSHBUTTON; | |
| 1318 case ui::AX_ROLE_RADIO_BUTTON: | |
| 1319 return ROLE_SYSTEM_RADIOBUTTON; | |
| 1320 case ui::AX_ROLE_SCROLL_BAR: | |
| 1321 return ROLE_SYSTEM_SCROLLBAR; | |
| 1322 case ui::AX_ROLE_SPLITTER: | |
| 1323 return ROLE_SYSTEM_SEPARATOR; | |
| 1324 case ui::AX_ROLE_SLIDER: | |
| 1325 return ROLE_SYSTEM_SLIDER; | |
| 1326 case ui::AX_ROLE_STATIC_TEXT: | |
| 1327 return ROLE_SYSTEM_STATICTEXT; | |
| 1328 case ui::AX_ROLE_TEXT_FIELD: | |
| 1329 return ROLE_SYSTEM_TEXT; | |
| 1330 case ui::AX_ROLE_TITLE_BAR: | |
| 1331 return ROLE_SYSTEM_TITLEBAR; | |
| 1332 case ui::AX_ROLE_TOOLBAR: | |
| 1333 return ROLE_SYSTEM_TOOLBAR; | |
| 1334 case ui::AX_ROLE_WINDOW: | |
| 1335 return ROLE_SYSTEM_WINDOW; | |
| 1336 case ui::AX_ROLE_CLIENT: | |
| 1337 default: | |
| 1338 // This is the default role for MSAA. | |
| 1339 return ROLE_SYSTEM_CLIENT; | |
| 1340 } | |
| 1341 } | |
| 1342 | |
| 1343 int32 NativeViewAccessibilityWin::MSAAState(const ui::AXViewState& state) { | |
| 1344 // This maps MSAA states for get_accState(). See also the IAccessible2 | |
| 1345 // interface get_states(). | |
| 1346 | |
| 1347 int32 msaa_state = 0; | |
| 1348 if (state.HasStateFlag(ui::AX_STATE_CHECKED)) | |
| 1349 msaa_state |= STATE_SYSTEM_CHECKED; | |
| 1350 if (state.HasStateFlag(ui::AX_STATE_COLLAPSED)) | |
| 1351 msaa_state |= STATE_SYSTEM_COLLAPSED; | |
| 1352 if (state.HasStateFlag(ui::AX_STATE_DEFAULT)) | |
| 1353 msaa_state |= STATE_SYSTEM_DEFAULT; | |
| 1354 if (state.HasStateFlag(ui::AX_STATE_EXPANDED)) | |
| 1355 msaa_state |= STATE_SYSTEM_EXPANDED; | |
| 1356 if (state.HasStateFlag(ui::AX_STATE_HASPOPUP)) | |
| 1357 msaa_state |= STATE_SYSTEM_HASPOPUP; | |
| 1358 if (state.HasStateFlag(ui::AX_STATE_HOVERED)) | |
| 1359 msaa_state |= STATE_SYSTEM_HOTTRACKED; | |
| 1360 if (state.HasStateFlag(ui::AX_STATE_INVISIBLE)) | |
| 1361 msaa_state |= STATE_SYSTEM_INVISIBLE; | |
| 1362 if (state.HasStateFlag(ui::AX_STATE_LINKED)) | |
| 1363 msaa_state |= STATE_SYSTEM_LINKED; | |
| 1364 if (state.HasStateFlag(ui::AX_STATE_OFFSCREEN)) | |
| 1365 msaa_state |= STATE_SYSTEM_OFFSCREEN; | |
| 1366 if (state.HasStateFlag(ui::AX_STATE_PRESSED)) | |
| 1367 msaa_state |= STATE_SYSTEM_PRESSED; | |
| 1368 if (state.HasStateFlag(ui::AX_STATE_PROTECTED)) | |
| 1369 msaa_state |= STATE_SYSTEM_PROTECTED; | |
| 1370 if (state.HasStateFlag(ui::AX_STATE_READ_ONLY)) | |
| 1371 msaa_state |= STATE_SYSTEM_READONLY; | |
| 1372 if (state.HasStateFlag(ui::AX_STATE_SELECTABLE)) | |
| 1373 msaa_state |= STATE_SYSTEM_SELECTABLE; | |
| 1374 if (state.HasStateFlag(ui::AX_STATE_SELECTED)) | |
| 1375 msaa_state |= STATE_SYSTEM_SELECTED; | |
| 1376 if (state.HasStateFlag(ui::AX_STATE_FOCUSED)) | |
| 1377 msaa_state |= STATE_SYSTEM_FOCUSED; | |
| 1378 if (state.HasStateFlag(ui::AX_STATE_DISABLED)) | |
| 1379 msaa_state |= STATE_SYSTEM_UNAVAILABLE; | |
| 1380 return msaa_state; | |
| 1381 } | |
| 1382 | |
| 1383 // | |
| 1384 // Private methods. | |
| 1385 // | |
| 1386 | |
| 1387 bool NativeViewAccessibilityWin::IsNavDirNext(int nav_dir) const { | |
| 1388 return (nav_dir == NAVDIR_RIGHT || | |
| 1389 nav_dir == NAVDIR_DOWN || | |
| 1390 nav_dir == NAVDIR_NEXT); | |
| 1391 } | |
| 1392 | |
| 1393 bool NativeViewAccessibilityWin::IsValidNav( | |
| 1394 int nav_dir, int start_id, int lower_bound, int upper_bound) const { | |
| 1395 if (IsNavDirNext(nav_dir)) { | |
| 1396 if ((start_id + 1) > upper_bound) { | |
| 1397 return false; | |
| 1398 } | |
| 1399 } else { | |
| 1400 if ((start_id - 1) <= lower_bound) { | |
| 1401 return false; | |
| 1402 } | |
| 1403 } | |
| 1404 return true; | |
| 1405 } | |
| 1406 | |
| 1407 bool NativeViewAccessibilityWin::IsValidId(const VARIANT& child) const { | |
| 1408 // View accessibility returns an IAccessible for each view so we only support | |
| 1409 // the CHILDID_SELF id. | |
| 1410 return (VT_I4 == child.vt) && (CHILDID_SELF == child.lVal); | |
| 1411 } | |
| 1412 | |
| 1413 void NativeViewAccessibilityWin::SetState( | |
| 1414 VARIANT* msaa_state, View* view) { | |
| 1415 // Ensure the output param is initialized to zero. | |
| 1416 msaa_state->lVal = 0; | |
| 1417 | |
| 1418 // Default state; all views can have accessibility focus. | |
| 1419 msaa_state->lVal |= STATE_SYSTEM_FOCUSABLE; | |
| 1420 | |
| 1421 if (!view) | |
| 1422 return; | |
| 1423 | |
| 1424 if (!view->enabled()) | |
| 1425 msaa_state->lVal |= STATE_SYSTEM_UNAVAILABLE; | |
| 1426 if (!view->visible()) | |
| 1427 msaa_state->lVal |= STATE_SYSTEM_INVISIBLE; | |
| 1428 if (!strcmp(view->GetClassName(), CustomButton::kViewClassName)) { | |
| 1429 CustomButton* button = static_cast<CustomButton*>(view); | |
| 1430 if (button->IsHotTracked()) | |
| 1431 msaa_state->lVal |= STATE_SYSTEM_HOTTRACKED; | |
| 1432 } | |
| 1433 if (view->HasFocus()) | |
| 1434 msaa_state->lVal |= STATE_SYSTEM_FOCUSED; | |
| 1435 | |
| 1436 // Add on any view-specific states. | |
| 1437 ui::AXViewState view_state; | |
| 1438 view->GetAccessibleState(&view_state); | |
| 1439 msaa_state->lVal |= MSAAState(view_state); | |
| 1440 } | |
| 1441 | |
| 1442 base::string16 NativeViewAccessibilityWin::TextForIAccessibleText() { | |
| 1443 ui::AXViewState state; | |
| 1444 view_->GetAccessibleState(&state); | |
| 1445 if (state.role == ui::AX_ROLE_TEXT_FIELD) | |
| 1446 return state.value; | |
| 1447 else | |
| 1448 return state.name; | |
| 1449 } | |
| 1450 | |
| 1451 void NativeViewAccessibilityWin::HandleSpecialTextOffset( | |
| 1452 const base::string16& text, LONG* offset) { | |
| 1453 if (*offset == IA2_TEXT_OFFSET_LENGTH) { | |
| 1454 *offset = static_cast<LONG>(text.size()); | |
| 1455 } else if (*offset == IA2_TEXT_OFFSET_CARET) { | |
| 1456 get_caretOffset(offset); | |
| 1457 } | |
| 1458 } | |
| 1459 | |
| 1460 ui::TextBoundaryType NativeViewAccessibilityWin::IA2TextBoundaryToTextBoundary( | |
| 1461 IA2TextBoundaryType ia2_boundary) { | |
| 1462 switch(ia2_boundary) { | |
| 1463 case IA2_TEXT_BOUNDARY_CHAR: return ui::CHAR_BOUNDARY; | |
| 1464 case IA2_TEXT_BOUNDARY_WORD: return ui::WORD_BOUNDARY; | |
| 1465 case IA2_TEXT_BOUNDARY_LINE: return ui::LINE_BOUNDARY; | |
| 1466 case IA2_TEXT_BOUNDARY_SENTENCE: return ui::SENTENCE_BOUNDARY; | |
| 1467 case IA2_TEXT_BOUNDARY_PARAGRAPH: return ui::PARAGRAPH_BOUNDARY; | |
| 1468 case IA2_TEXT_BOUNDARY_ALL: return ui::ALL_BOUNDARY; | |
| 1469 default: | |
| 1470 NOTREACHED(); | |
| 1471 return ui::CHAR_BOUNDARY; | |
| 1472 } | |
| 1473 } | |
| 1474 | |
| 1475 LONG NativeViewAccessibilityWin::FindBoundary( | |
| 1476 const base::string16& text, | |
| 1477 IA2TextBoundaryType ia2_boundary, | |
| 1478 LONG start_offset, | |
| 1479 ui::TextBoundaryDirection direction) { | |
| 1480 HandleSpecialTextOffset(text, &start_offset); | |
| 1481 ui::TextBoundaryType boundary = IA2TextBoundaryToTextBoundary(ia2_boundary); | |
| 1482 std::vector<int32> line_breaks; | |
| 1483 return ui::FindAccessibleTextBoundary( | |
| 1484 text, line_breaks, boundary, start_offset, direction); | |
| 1485 } | |
| 1486 | |
| 1487 void NativeViewAccessibilityWin::PopulateChildWidgetVector( | |
| 1488 std::vector<Widget*>* result_child_widgets) { | |
| 1489 const Widget* widget = view()->GetWidget(); | |
| 1490 if (!widget) | |
| 1491 return; | |
| 1492 | |
| 1493 std::set<Widget*> child_widgets; | |
| 1494 Widget::GetAllChildWidgets(widget->GetNativeView(), &child_widgets); | |
| 1495 Widget::GetAllOwnedWidgets(widget->GetNativeView(), &child_widgets); | |
| 1496 for (std::set<Widget*>::const_iterator iter = child_widgets.begin(); | |
| 1497 iter != child_widgets.end(); ++iter) { | |
| 1498 Widget* child_widget = *iter; | |
| 1499 if (child_widget == widget) | |
| 1500 continue; | |
| 1501 | |
| 1502 if (!child_widget->IsVisible()) | |
| 1503 continue; | |
| 1504 | |
| 1505 if (widget->GetNativeWindowProperty(kWidgetNativeViewHostKey)) | |
| 1506 continue; | |
| 1507 | |
| 1508 result_child_widgets->push_back(child_widget); | |
| 1509 } | |
| 1510 } | |
| 1511 | |
| 1512 void NativeViewAccessibilityWin::AddAlertTarget() { | |
| 1513 ViewStorage* view_storage = ViewStorage::GetInstance(); | |
| 1514 for (size_t i = 0; i < alert_target_view_storage_ids_.size(); ++i) { | |
| 1515 int view_storage_id = alert_target_view_storage_ids_[i]; | |
| 1516 View* view = view_storage->RetrieveView(view_storage_id); | |
| 1517 if (view == view_) | |
| 1518 return; | |
| 1519 } | |
| 1520 int view_storage_id = view_storage->CreateStorageID(); | |
| 1521 view_storage->StoreView(view_storage_id, view_); | |
| 1522 alert_target_view_storage_ids_.push_back(view_storage_id); | |
| 1523 } | |
| 1524 | |
| 1525 void NativeViewAccessibilityWin::RemoveAlertTarget() { | |
| 1526 ViewStorage* view_storage = ViewStorage::GetInstance(); | |
| 1527 size_t i = 0; | |
| 1528 while (i < alert_target_view_storage_ids_.size()) { | |
| 1529 int view_storage_id = alert_target_view_storage_ids_[i]; | |
| 1530 View* view = view_storage->RetrieveView(view_storage_id); | |
| 1531 if (view == NULL || view == view_) { | |
| 1532 alert_target_view_storage_ids_.erase( | |
| 1533 alert_target_view_storage_ids_.begin() + i); | |
| 1534 } else { | |
| 1535 ++i; | |
| 1536 } | |
| 1537 } | |
| 1538 } | |
| 1539 | |
| 1540 } // namespace views | |
| OLD | NEW |
|---|
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