Expose an accessible relation between the main window and active alert.

ui/views/accessibility/native_view_accessibility_win_unittest.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <oleacc.h>
 
 #include "base/win/scoped_bstr.h"
 #include "base/win/scoped_comptr.h"
 #include "base/win/scoped_variant.h"
+#include "third_party/iaccessible2/ia2_api_all.h"
 #include "ui/views/accessibility/native_view_accessibility.h"
 #include "ui/views/controls/textfield/textfield.h"
 #include "ui/views/test/views_test_base.h"
 
+using base::win::ScopedBstr;
+using base::win::ScopedComPtr;
+using base::win::ScopedVariant;
+
 namespace views {
 namespace test {
 
-typedef ViewsTestBase NativeViewAcccessibilityWinTest;
+class NativeViewAcccessibilityWinTest : public ViewsTestBase {
+ public:
+  NativeViewAcccessibilityWinTest() {}
+  virtual ~NativeViewAcccessibilityWinTest() {}
+
+ protected:
+  void GetIAccessible2InterfaceForView(View* view, IAccessible2_2** result) {
+    ScopedComPtr<IAccessible> view_accessible(
+        view->GetNativeViewAccessible());
+    ScopedComPtr<IServiceProvider> service_provider;
+    view_accessible.QueryInterface(service_provider.Receive());

[David Tseng, 2014/05/13 01:34:54]

Dup with below?

[dmazzoni, 2014/05/13 07:38:46]

Done.

+    ASSERT_EQ(view_accessible.QueryInterface(service_provider.Receive()), S_OK);

[David Tseng, 2014/05/13 01:34:54]

(S_OK, ...); i.e. ASSERT_EQ(expected, actual)

[dmazzoni, 2014/05/13 07:38:46]

Done.

+    ASSERT_EQ(S_OK,
+        service_provider->QueryService(IID_IAccessible2_2, result));
+  }
+};
 
 TEST_F(NativeViewAcccessibilityWinTest, TextfieldAccessibility) {
   Widget widget;
   Widget::InitParams init_params =
       CreateParams(Widget::InitParams::TYPE_POPUP);
   init_params.ownership = Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
   widget.Init(init_params);
 
   View* content = new View;
   widget.SetContentsView(content);
 
   Textfield* textfield = new Textfield;
   textfield->SetAccessibleName(L"Name");
   textfield->SetText(L"Value");
   content->AddChildView(textfield);
 
-  base::win::ScopedComPtr<IAccessible> content_accessible(
+  ScopedComPtr<IAccessible> content_accessible(
       content->GetNativeViewAccessible());
   LONG child_count = 0;
   ASSERT_EQ(S_OK, content_accessible->get_accChildCount(&child_count));
   ASSERT_EQ(1L, child_count);
 
-  base::win::ScopedComPtr<IDispatch> textfield_dispatch;
-  base::win::ScopedComPtr<IAccessible> textfield_accessible;
-  base::win::ScopedVariant child_index(1);
+  ScopedComPtr<IDispatch> textfield_dispatch;
+  ScopedComPtr<IAccessible> textfield_accessible;
+  ScopedVariant child_index(1);
   ASSERT_EQ(S_OK, content_accessible->get_accChild(
       child_index, textfield_dispatch.Receive()));
   ASSERT_EQ(S_OK, textfield_dispatch.QueryInterface(
       textfield_accessible.Receive()));
 
-  base::win::ScopedBstr name;
-  base::win::ScopedVariant childid_self(CHILDID_SELF);
+  ScopedBstr name;
+  ScopedVariant childid_self(CHILDID_SELF);
   ASSERT_EQ(S_OK, textfield_accessible->get_accName(
       childid_self, name.Receive()));
   ASSERT_STREQ(L"Name", name);
 
-  base::win::ScopedBstr value;
+  ScopedBstr value;
   ASSERT_EQ(S_OK, textfield_accessible->get_accValue(
       childid_self, value.Receive()));
   ASSERT_STREQ(L"Value", value);
 
-  base::win::ScopedBstr new_value(L"New value");
+  ScopedBstr new_value(L"New value");
   ASSERT_EQ(S_OK, textfield_accessible->put_accValue(childid_self, new_value));
 
   ASSERT_STREQ(L"New value", textfield->text().c_str());
 }
 
 TEST_F(NativeViewAcccessibilityWinTest, UnattachedWebView) {
   // This is a regression test. Calling get_accChild on the native accessible
   // object for a WebView with no attached WebContents was causing an
   // infinite loop and crash. This test simulates that with an ordinary
   // View that registers itself as a web view with NativeViewAcccessibility.
 
   Widget widget;
   Widget::InitParams init_params =
       CreateParams(Widget::InitParams::TYPE_POPUP);
   init_params.ownership = Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
   widget.Init(init_params);
 
   View* content = new View;
   widget.SetContentsView(content);
 
   View* web_view = new View;
   content->AddChildView(web_view);
   NativeViewAccessibility::RegisterWebView(web_view);
 
-  base::win::ScopedComPtr<IAccessible> web_view_accessible(
+  ScopedComPtr<IAccessible> web_view_accessible(
       web_view->GetNativeViewAccessible());
-  base::win::ScopedComPtr<IDispatch> result_dispatch;
-  base::win::ScopedVariant child_index(-999);
+  ScopedComPtr<IDispatch> result_dispatch;
+  ScopedVariant child_index(-999);
   ASSERT_EQ(E_FAIL, web_view_accessible->get_accChild(
       child_index, result_dispatch.Receive()));
 
   NativeViewAccessibility::UnregisterWebView(web_view);
 }
 
 TEST_F(NativeViewAcccessibilityWinTest, AuraOwnedWidgets) {
   Widget widget;
   Widget::InitParams init_params =
       CreateParams(Widget::InitParams::TYPE_WINDOW);
   init_params.ownership = Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
   widget.Init(init_params);
 
-  base::win::ScopedComPtr<IAccessible> root_view_accessible(
+  ScopedComPtr<IAccessible> root_view_accessible(
       widget.GetRootView()->GetNativeViewAccessible());
 
   LONG child_count = 0;
   ASSERT_EQ(S_OK, root_view_accessible->get_accChildCount(&child_count));
   ASSERT_EQ(1L, child_count);
 
   Widget owned_widget;
   Widget::InitParams owned_init_params =
       CreateParams(Widget::InitParams::TYPE_POPUP);
   owned_init_params.ownership = Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
   owned_init_params.child = false;
   owned_init_params.parent = widget.GetNativeView();
   owned_widget.Init(owned_init_params);
   owned_widget.Show();
 
   ASSERT_EQ(S_OK, root_view_accessible->get_accChildCount(&child_count));
   ASSERT_EQ(2L, child_count);
 }
 
+TEST_F(NativeViewAcccessibilityWinTest, RetrieveAllAlerts) {
+  Widget widget;
+  Widget::InitParams init_params =
+      CreateParams(Widget::InitParams::TYPE_POPUP);
+  init_params.ownership = Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
+  widget.Init(init_params);
+
+  View* content = new View;
+  widget.SetContentsView(content);
+
+  View* infobar = new View;
+  content->AddChildView(infobar);
+
+  View* infobar2 = new View;
+  content->AddChildView(infobar2);
+
+  View* root_view = content->parent();
+  ASSERT_EQ(NULL, root_view->parent());
+
+  ScopedComPtr<IAccessible2_2> root_view_accessible;
+  GetIAccessible2InterfaceForView(root_view, root_view_accessible.Receive());

[David Tseng, 2014/05/13 01:34:54]

ASSERT_EQ?

[dmazzoni, 2014/05/13 07:38:46]

It asserts inside this helper function.

+
+  ScopedComPtr<IAccessible2_2> infobar_accessible;
+  GetIAccessible2InterfaceForView(infobar, infobar_accessible.Receive());
+
+  ScopedComPtr<IAccessible2_2> infobar2_accessible;
+  GetIAccessible2InterfaceForView(infobar2, infobar2_accessible.Receive());
+
+  // Initially, there are no alerts
+  ScopedBstr alerts_bstr(L"alerts");
+  IUnknown** targets;
+  long n_targets;
+  ASSERT_EQ(S_FALSE, root_view_accessible->get_relationTargetsOfType(
+      alerts_bstr, 0, &targets, &n_targets));
+  ASSERT_EQ(0, n_targets);
+
+  // Fire alert events on the infobars.
+  infobar->NotifyAccessibilityEvent(ui::AX_EVENT_ALERT, true);
+  infobar2->NotifyAccessibilityEvent(ui::AX_EVENT_ALERT, true);
+
+  // Now calling get_relationTargetsOfType should retrieve the alerts.
+  ASSERT_EQ(S_OK, root_view_accessible->get_relationTargetsOfType(
+      alerts_bstr, 0, &targets, &n_targets));
+  ASSERT_EQ(2, n_targets);
+  ASSERT_TRUE(infobar_accessible.IsSameObject(targets[0]));
+  ASSERT_TRUE(infobar2_accessible.IsSameObject(targets[1]));
+  CoTaskMemFree(targets);
+
+  // If we set max_targets to 1, we should only get the first one.
+  ASSERT_EQ(S_OK, root_view_accessible->get_relationTargetsOfType(
+      alerts_bstr, 1, &targets, &n_targets));
+  ASSERT_EQ(1, n_targets);
+  ASSERT_TRUE(infobar_accessible.IsSameObject(targets[0]));
+  CoTaskMemFree(targets);

[David Tseng, 2014/05/13 01:34:54]

Odd to see this freed after each call; is this correct?

[dmazzoni, 2014/05/13 07:38:46]

Yep, that's what the spec says. The server allocates it, the caller frees it.

I guess the idea is that it's better than requiring multiple calls - one to get
the number of targets, and then more to retrieve each target.

+
+  // If we delete the first view, we should only get the second one now.
+  delete infobar;
+  ASSERT_EQ(S_OK, root_view_accessible->get_relationTargetsOfType(
+      alerts_bstr, 0, &targets, &n_targets));
+  ASSERT_EQ(1, n_targets);
+  ASSERT_TRUE(infobar2_accessible.IsSameObject(targets[0]));
+  CoTaskMemFree(targets);
+}
+
 }  // namespace test
 }  // namespace views