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

ui/views/accessibility/native_view_accessibility_win.h

Index: ui/views/accessibility/native_view_accessibility_win.h
diff --git a/ui/views/accessibility/native_view_accessibility_win.h b/ui/views/accessibility/native_view_accessibility_win.h
index 2c8c1fee76e267df65ce16d571ea0ea04248515c..7e566c63d807ad0fdc49ddd566bf1d8731d13c54 100644
--- a/ui/views/accessibility/native_view_accessibility_win.h
+++ b/ui/views/accessibility/native_view_accessibility_win.h
@@ -12,6 +12,7 @@
 #include <UIAutomationCore.h>
 
 #include <set>
+#include <vector>
 
 #include "third_party/iaccessible2/ia2_api_all.h"
 #include "ui/accessibility/ax_view_state.h"
@@ -38,7 +39,7 @@ namespace views {
 class __declspec(uuid("26f5641a-246d-457b-a96d-07f3fae6acf2"))
 NativeViewAccessibilityWin
   : public CComObjectRootEx<CComMultiThreadModel>,
-    public IDispatchImpl<IAccessible2, &IID_IAccessible2,
+    public IDispatchImpl<IAccessible2_2, &IID_IAccessible2_2,
                            &LIBID_IAccessible2Lib>,
     public IAccessibleText,
     public IServiceProvider,
@@ -47,9 +48,9 @@ NativeViewAccessibilityWin
     public NativeViewAccessibility {
  public:
   BEGIN_COM_MAP(NativeViewAccessibilityWin)
-    COM_INTERFACE_ENTRY2(IDispatch, IAccessible2)
-    COM_INTERFACE_ENTRY2(IAccessible, IAccessible2)
-    COM_INTERFACE_ENTRY(IAccessible2)
+    COM_INTERFACE_ENTRY2(IDispatch, IAccessible2_2)
+    COM_INTERFACE_ENTRY2(IAccessible, IAccessible2_2)
+    COM_INTERFACE_ENTRY(IAccessible2_2)
     COM_INTERFACE_ENTRY(IAccessibleText)
     COM_INTERFACE_ENTRY(IServiceProvider)
     COM_INTERFACE_ENTRY(IAccessibleEx)
@@ -145,6 +146,11 @@ NativeViewAccessibilityWin
 
   STDMETHODIMP get_windowHandle(HWND* window_handle);
 
+  STDMETHODIMP get_relationTargetsOfType(BSTR type,
+                                         long max_targets,
+                                         IUnknown ***targets,
+                                         long *n_targets);
+
   //
   // IAccessible2 methods not implemented.
   //
@@ -152,6 +158,9 @@ NativeViewAccessibilityWin
   STDMETHODIMP get_attributes(BSTR* attributes) {
     return E_NOTIMPL;
   }
+  STDMETHODIMP get_attribute(BSTR name, VARIANT* attribute) {
+    return E_NOTIMPL;
+  }
   STDMETHODIMP get_indexInParent(LONG* index_in_parent) {
     return E_NOTIMPL;
   }
@@ -205,6 +214,10 @@ NativeViewAccessibilityWin
   STDMETHODIMP get_locale(IA2Locale* locale) {
     return E_NOTIMPL;
   }
+  STDMETHODIMP get_accessibleWithCaret(IUnknown** accessible,
+                                       long* caret_offset) {
+    return E_NOTIMPL;
+  }
 
   //
   // IAccessibleText methods.
@@ -396,6 +409,12 @@ NativeViewAccessibilityWin
   // NativeViewHost.
   void PopulateChildWidgetVector(std::vector<Widget*>* child_widgets);
 
+  // Adds this view to alert_target_view_storage_ids_.
+  void AddAlertTarget();
+
+  // Removes this view from alert_target_view_storage_ids_.
+  void RemoveAlertTarget();
+
   // Give CComObject access to the class constructor.
   template <class Base> friend class CComObject;
 
@@ -418,6 +437,11 @@ NativeViewAccessibilityWin
   // Next index into |view_storage_ids_| to use.
   static int next_view_storage_id_index_;
 
+  // A vector of view storage ids of views that have been the target of
+  // an alert event, in order to provide an api to quickly identify all
+  // open alerts.
+  static std::vector<int> alert_target_view_storage_ids_;
+

[David Tseng, 2014/05/08 17:23:55]

Why is this static? Shouldn't the lifetime of this list of ids be tied to this
instance?

[dmazzoni, 2014/05/08 19:16:13]

Every view has its own instance of this class.

There shouldn't be that many alerts. It seemed simpler to keep track of all
alerts, globally, and then return the ones associated with a window on-demand.

Would a comment make that more clear?

If you'd prefer, the alternative would be to map each alert to its root view,
then keep track of it there - the downside is we'd either need a special class
for the root view, or a field that only applies to that view.

   DISALLOW_COPY_AND_ASSIGN(NativeViewAccessibilityWin);
 };