Improve omnibox accessibility on Windows.

chrome/browser/autocomplete/autocomplete_accessibility.cc

-// Copyright (c) 2011 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 "chrome/browser/autocomplete/autocomplete_accessibility.h"
-
-#include "chrome/browser/autocomplete/autocomplete_edit.h"
-#include "chrome/browser/ui/views/omnibox/omnibox_view_win.h"
-#include "grit/generated_resources.h"
-#include "ui/base/l10n/l10n_util.h"
-#include "views/accessibility/native_view_accessibility_win.h"
-#include "views/view.h"
-
-HRESULT AutocompleteAccessibility::Initialize(
-    const OmniboxViewWin* omnibox_view) {
-  if (omnibox_view == NULL) {
-    return E_INVALIDARG;
-  }
-
-  omnibox_view_ = omnibox_view;
-
-  // Create a default accessible object for this instance.
-  return CreateStdAccessibleObject(omnibox_view_->m_hWnd, OBJID_CLIENT,
-      IID_IAccessible,
-      reinterpret_cast<void **>(default_accessibility_server_.Receive()));
-}
-
-STDMETHODIMP AutocompleteAccessibility::get_accChildCount(LONG* child_count) {
-  if (!child_count) {
-    return E_INVALIDARG;
-  }
-
-  DCHECK(default_accessibility_server_);
-  return default_accessibility_server_->get_accChildCount(child_count);
-}
-
-STDMETHODIMP AutocompleteAccessibility::get_accChild(VARIANT var_child,
-                                                     IDispatch** disp_child) {
-  if (var_child.vt != VT_I4 || !disp_child) {
-    return E_INVALIDARG;
-  }
-
-  // If var_child is the parent, remain with the same IDispatch
-  if (var_child.lVal == CHILDID_SELF)
-    return S_OK;
-
-  *disp_child = NULL;
-  return S_FALSE;
-}
-
-STDMETHODIMP AutocompleteAccessibility::get_accParent(IDispatch** disp_parent) {
-  if (!disp_parent) {
-    return E_INVALIDARG;
-  }
-
-  if (omnibox_view_->parent_view() == NULL) {
-    *disp_parent = NULL;
-    return S_FALSE;
-  }
-
-  // Retrieve the IDispatch interface for the parent view.
-  *disp_parent = omnibox_view_->parent_view()->GetNativeViewAccessible();
-  // Increment the reference count for the retrieved interface.
-  (*disp_parent)->AddRef();
-  return S_OK;
-}
-
-STDMETHODIMP AutocompleteAccessibility::accNavigate(LONG nav_dir, VARIANT start,
-                                                    VARIANT* end) {
-  if (start.vt != VT_I4 || !end) {
-    return E_INVALIDARG;
-  }
-
-  DCHECK(default_accessibility_server_);
-  return default_accessibility_server_->accNavigate(nav_dir, start, end);
-}
-
-STDMETHODIMP AutocompleteAccessibility::get_accFocus(VARIANT* focus_child) {
-  if (!focus_child) {
-    return E_INVALIDARG;
-  }
-
-  DCHECK(default_accessibility_server_);
-  return default_accessibility_server_->get_accFocus(focus_child);
-}
-
-STDMETHODIMP AutocompleteAccessibility::get_accName(VARIANT var_id,
-                                                    BSTR* name) {
-  if (var_id.vt != VT_I4 || !name) {
-    return E_INVALIDARG;
-  }
-
-  string16 temp_name = l10n_util::GetStringUTF16(IDS_ACCNAME_LOCATION);
-
-  if (!temp_name.empty()) {
-    // Return name retrieved.
-    *name = SysAllocString(temp_name.c_str());
-  } else {
-    // If no name is found, return S_FALSE.
-    return S_FALSE;
-  }
-  DCHECK(*name);
-
-  return S_OK;
-}
-
-STDMETHODIMP AutocompleteAccessibility::get_accDescription(VARIANT var_id,
-                                                           BSTR* desc) {
-  if (var_id.vt != VT_I4 || !desc) {
-    return E_INVALIDARG;
-  }
-
-  return S_FALSE;
-}
-
-STDMETHODIMP AutocompleteAccessibility::get_accValue(VARIANT var_id,
-                                                     BSTR* value) {
-  if (var_id.vt != VT_I4 || !value) {
-    return E_INVALIDARG;
-  }
-
-  string16 temp_value;
-
-  if (var_id.lVal != CHILDID_SELF)
-    return E_INVALIDARG;
-
-  // Edit box has no children, only handle self.
-  temp_value = omnibox_view_->GetText();
-  if (temp_value.empty())
-    return S_FALSE;
-
-  // Return value retrieved.
-  *value = SysAllocString(temp_value.c_str());
-
-  DCHECK(*value);
-
-  return S_OK;
-}
-
-STDMETHODIMP AutocompleteAccessibility::get_accState(VARIANT var_id,
-                                                     VARIANT* state) {
-  if (var_id.vt != VT_I4 || !state) {
-    return E_INVALIDARG;
-  }
-
-  DCHECK(default_accessibility_server_);
-  HRESULT hr = default_accessibility_server_->get_accState(var_id, state);
-
-  if (hr != S_OK)
-    return hr;
-
-  // Adding on state to convey the fact that there is a dropdown.
-  state->lVal |= STATE_SYSTEM_HASPOPUP;
-  return S_OK;
-}
-
-STDMETHODIMP AutocompleteAccessibility::get_accRole(VARIANT var_id,
-                                                    VARIANT* role) {
-  if (var_id.vt != VT_I4 || !role) {
-    return E_INVALIDARG;
-  }
-
-  role->vt = VT_I4;
-
-  // Need to override the default role, which is ROLE_SYSTEM_CLIENT.
-  if (var_id.lVal == CHILDID_SELF) {
-    role->lVal = ROLE_SYSTEM_TEXT;
-  } else {
-    return S_FALSE;
-  }
-
-  return S_OK;
-}
-
-STDMETHODIMP AutocompleteAccessibility::get_accDefaultAction(VARIANT var_id,
-                                                             BSTR* def_action) {
-  if (var_id.vt != VT_I4 || !def_action) {
-    return E_INVALIDARG;
-  }
-
-  return S_FALSE;
-}
-
-STDMETHODIMP AutocompleteAccessibility::accLocation(LONG* x_left, LONG* y_top,
-                                                    LONG* width, LONG* height,
-                                                    VARIANT var_id) {
-  if (var_id.vt != VT_I4 || !x_left || !y_top || !width || !height) {
-    return E_INVALIDARG;
-  }
-
-  DCHECK(default_accessibility_server_);
-  return default_accessibility_server_->accLocation(x_left, y_top, width,
-                                                    height, var_id);
-}
-
-STDMETHODIMP AutocompleteAccessibility::accHitTest(LONG x_left, LONG y_top,
-                                                   VARIANT* child) {
-  if (!child) {
-    return E_INVALIDARG;
-  }
-
-  DCHECK(default_accessibility_server_);
-  return default_accessibility_server_->accHitTest(x_left, y_top, child);
-}
-
-STDMETHODIMP AutocompleteAccessibility::get_accKeyboardShortcut(VARIANT var_id,
-                                                                BSTR* acc_key) {
-  if (var_id.vt != VT_I4 || !acc_key) {
-    return E_INVALIDARG;
-  }
-
-  return S_FALSE;
-}
-
-// IAccessible functions not supported.
-
-HRESULT AutocompleteAccessibility::accDoDefaultAction(VARIANT var_id) {
-  return DISP_E_MEMBERNOTFOUND;
-}
-
-STDMETHODIMP AutocompleteAccessibility::get_accSelection(VARIANT* selected) {
-  if (selected)
-    selected->vt = VT_EMPTY;
-  return DISP_E_MEMBERNOTFOUND;
-}
-
-STDMETHODIMP AutocompleteAccessibility::accSelect(LONG flagsSelect,
-                                                  VARIANT var_id) {
-  return DISP_E_MEMBERNOTFOUND;
-}
-
-STDMETHODIMP AutocompleteAccessibility::get_accHelp(VARIANT var_id,
-                                                    BSTR* help) {
-  if (help)
-    *help = NULL;
-  return DISP_E_MEMBERNOTFOUND;
-}
-
-STDMETHODIMP AutocompleteAccessibility::get_accHelpTopic(BSTR* help_file,
-                                                         VARIANT var_id,
-                                                         LONG* topic_id) {
-  if (help_file) {
-    *help_file = NULL;
-  }
-  if (topic_id) {
-    *topic_id = static_cast<LONG>(-1);
-  }
-  return DISP_E_MEMBERNOTFOUND;
-}
-
-STDMETHODIMP AutocompleteAccessibility::put_accName(VARIANT var_id,
-                                                    BSTR put_name) {
-  // Deprecated.
-  return DISP_E_MEMBERNOTFOUND;
-}
-
-STDMETHODIMP AutocompleteAccessibility::put_accValue(VARIANT var_id,
-                                                     BSTR put_val) {
-  // Deprecated.
-  return DISP_E_MEMBERNOTFOUND;
-}