Add support for UIA accessibility interfaces like IAccessibleEx and IRawElementProviderSimple.

base/win/accessibility_misc_utils.h

+// Copyright (c) 2012 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.
+#ifndef BASE_WIN_ACCESSIBILITY_MISC_UTILS_H_
+#define BASE_WIN_ACCESSIBILITY_MISC_UTILS_H_
+#pragma once
+
+#include <atlbase.h>
+#include <atlcom.h>
+#include <UIAutomationCore.h>
+
+#include "base/base_export.h"
+
+namespace base {
+namespace win {
+
+  // UIA Text provider implementation for edit controls.
+class BASE_EXPORT UIATextProvider
+    : public CComObjectRootEx<CComMultiThreadModel>,
+      public IValueProvider,
+      public ITextProvider {
+ public:
+  BEGIN_COM_MAP(UIATextProvider)
+    COM_INTERFACE_ENTRY2(IUnknown, ITextProvider)
+    COM_INTERFACE_ENTRY(IValueProvider)
+    COM_INTERFACE_ENTRY(ITextProvider)
+  END_COM_MAP()
+
+  UIATextProvider();
+
+  // Creates an instance of the UIATextProvider class.
+  // Returns true on success
+  static bool CreateTextProvider(bool editable, IUnknown** provider);
+
+  void set_editable(bool editable) {
+    editable_ = editable;
+  }
+
+  //
+  // IValueProvider methods.
+  //
+  STDMETHODIMP get_IsReadOnly(BOOL* read_only);
+
+  //
+  // IValueProvider methods not implemented.
+  //
+  STDMETHODIMP SetValue(const wchar_t* val) {
+    return E_NOTIMPL;
+  }
+
+  STDMETHODIMP get_Value(BSTR* value) {
+    return E_NOTIMPL;
+  }
+
+  //
+  // ITextProvider methods.
+  //
+  STDMETHODIMP GetSelection(SAFEARRAY** ret) {
+    return E_NOTIMPL;
+  }
+
+  STDMETHODIMP GetVisibleRanges(SAFEARRAY** ret) {
+    return E_NOTIMPL;
+  }
+
+  STDMETHODIMP RangeFromChild(IRawElementProviderSimple* child,
+                              ITextRangeProvider** ret) {
+    return E_NOTIMPL;
+  }
+
+  STDMETHODIMP RangeFromPoint(struct UiaPoint point,
+                              ITextRangeProvider** ret) {
+    return E_NOTIMPL;
+  }
+
+  STDMETHODIMP get_DocumentRange(ITextRangeProvider** ret) {
+    return E_NOTIMPL;
+  }
+
+  STDMETHODIMP get_SupportedTextSelection(enum SupportedTextSelection* ret) {
+    return E_NOTIMPL;
+  }
+
+ private:
+  bool editable_;
+};
+
+}  // win
+}  // base
+
+#endif  // BASE_WIN_ACCESSIBILITY_MISC_UTILS_H_