Make BrowserAccessibilityManager cross platform. Step 2.

chrome/browser/accessibility/browser_accessibility_manager_win.cc

 // Copyright (c) 2010 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/accessibility/browser_accessibility_manager_win.h"
 
 #include "chrome/browser/accessibility/browser_accessibility_win.h"
-#include "chrome/browser/renderer_host/render_process_host.h"
-#include "chrome/browser/renderer_host/render_view_host.h"
-#include "chrome/common/render_messages.h"
-#include "chrome/common/render_messages_params.h"
 
 using webkit_glue::WebAccessibility;
 
 // static
 BrowserAccessibilityManager* BrowserAccessibilityManager::Create(
-    gfx::NativeWindow parent_window,
-    const webkit_glue::WebAccessibility& src,
-    BrowserAccessibilityDelegate* delegate) {
+    gfx::NativeView parent_view,
+    const WebAccessibility& src,
+    BrowserAccessibilityDelegate* delegate,
+    BrowserAccessibilityFactory* factory) {
   return new BrowserAccessibilityManagerWin(
-      parent_window, src, delegate, new BrowserAccessibilityWinFactory());
+      parent_view,
+      src,
+      delegate,
+      factory);
 }
 
-// Factory method to create an instance of BrowserAccessibility
-BrowserAccessibilityWin* BrowserAccessibilityWinFactory::Create() {
-  CComObject<BrowserAccessibilityWin>* instance;
-  HRESULT hr = CComObject<BrowserAccessibilityWin>::CreateInstance(&instance);
-  DCHECK(SUCCEEDED(hr));
-  return instance->NewReference();
+// Defining this here instead of in the base implementation file to address link
+// errors on the linux shared library build. (linux shlib)
+BrowserAccessibility* BrowserAccessibilityFactory::Create() {
+  return BrowserAccessibility::Create();
 }
 
-// static
-// Start child IDs at -1 and decrement each time, because clients use
-// child IDs of 1, 2, 3, ... to access the children of an object by
-// index, so we use negative IDs to clearly distinguish between indices
-// and unique IDs.
-LONG BrowserAccessibilityManagerWin::next_child_id_ = -1;
+BrowserAccessibilityManagerWin*
+BrowserAccessibilityManager::toBrowserAccessibilityManagerWin() {
+  return static_cast<BrowserAccessibilityManagerWin*>(this);
+}
 
 BrowserAccessibilityManagerWin::BrowserAccessibilityManagerWin(
-    HWND parent_window,
-    const webkit_glue::WebAccessibility& src,
+    HWND parent_view,
+    const WebAccessibility& src,
     BrowserAccessibilityDelegate* delegate,
-    BrowserAccessibilityWinFactory* factory)
-    : BrowserAccessibilityManager(parent_window),
-      delegate_(delegate),
-      factory_(factory),
-      focus_(NULL) {
+    BrowserAccessibilityFactory* factory)
+    : BrowserAccessibilityManager(parent_view, src, delegate, factory) {
   HRESULT hr = ::CreateStdAccessibleObject(
-      parent_window, OBJID_WINDOW, IID_IAccessible,
+      parent_view, OBJID_WINDOW, IID_IAccessible,
       reinterpret_cast<void **>(&window_iaccessible_));
   DCHECK(SUCCEEDED(hr));
-  root_ = CreateAccessibilityTree(NULL, GetNextChildID(), src, 0);
-  if (!focus_)
-    focus_ = root_;
 }
 
 BrowserAccessibilityManagerWin::~BrowserAccessibilityManagerWin() {
-  // Clients could still hold references to some nodes of the tree, so
-  // calling Inactivate will make sure that as many nodes as possible are
-  // released now, and remaining nodes are marked as inactive so that
-  // calls to any methods on them will return E_FAIL;
-  root_->InactivateTree();
-  root_->Release();
-}
-
-BrowserAccessibilityWin* BrowserAccessibilityManagerWin::GetRoot() {
-  return root_;
-}
-
-void BrowserAccessibilityManagerWin::Remove(LONG child_id) {
-  child_id_map_.erase(child_id);
-}
-
-BrowserAccessibilityWin* BrowserAccessibilityManagerWin::GetFromChildID(
-    LONG child_id) {
-  base::hash_map<LONG, BrowserAccessibilityWin*>::iterator iter =
-      child_id_map_.find(child_id);
-  if (iter != child_id_map_.end()) {
-    return iter->second;
-  } else {
-    return NULL;
-  }
 }
 
 IAccessible* BrowserAccessibilityManagerWin::GetParentWindowIAccessible() {
   return window_iaccessible_;
 }
 
-BrowserAccessibilityWin* BrowserAccessibilityManagerWin::GetFocus(
-    BrowserAccessibilityWin* root) {
-  if (focus_ && (!root || focus_->IsDescendantOf(root)))
-    return focus_;
-
-  return NULL;
-}
-
-void BrowserAccessibilityManagerWin::SetFocus(
-    const BrowserAccessibilityWin& node) {
-  if (delegate_)
-    delegate_->SetAccessibilityFocus(node.renderer_id());
-}
-
-void BrowserAccessibilityManagerWin::DoDefaultAction(
-    const BrowserAccessibilityWin& node) {
-  if (delegate_)
-    delegate_->AccessibilityDoDefaultAction(node.renderer_id());
-}
-
-bool BrowserAccessibilityManagerWin::CanModifyTreeInPlace(
-    BrowserAccessibilityWin* current_root,
-    const webkit_glue::WebAccessibility& new_root) {
-  if (current_root->renderer_id() != new_root.id)
-    return false;
-  if (current_root->GetChildCount() != new_root.children.size())
-    return false;
-  for (unsigned int i = 0; i < current_root->GetChildCount(); i++) {
-    if (!CanModifyTreeInPlace(current_root->GetChild(i),
-                              new_root.children[i])) {
-      return false;
-    }
-  }
-  return true;
-}
-
-void BrowserAccessibilityManagerWin::ModifyTreeInPlace(
-      BrowserAccessibilityWin* current_root,
-      const webkit_glue::WebAccessibility& new_root) {
-  DCHECK_EQ(current_root->renderer_id(), new_root.id);
-  DCHECK_EQ(current_root->GetChildCount(), new_root.children.size());
-  for (unsigned int i = 0; i < current_root->GetChildCount(); i++)
-    ModifyTreeInPlace(current_root->GetChild(i), new_root.children[i]);
-  current_root->Initialize(
-      this,
-      current_root->GetParent(),
-      current_root->child_id(),
-      current_root->index_in_parent(),
-      new_root);
-}
-
-
-BrowserAccessibilityWin* BrowserAccessibilityManagerWin::UpdateTree(
-    const webkit_glue::WebAccessibility& acc_obj) {
-  base::hash_map<int, LONG>::iterator iter =
-      renderer_id_to_child_id_map_.find(acc_obj.id);
-  if (iter == renderer_id_to_child_id_map_.end())
-    return NULL;
-
-  LONG child_id = iter->second;
-  BrowserAccessibilityWin* old_browser_acc = GetFromChildID(child_id);
-  if (!old_browser_acc)
-    return NULL;
-
-  if (CanModifyTreeInPlace(old_browser_acc, acc_obj)) {
-    ModifyTreeInPlace(old_browser_acc, acc_obj);
-    return old_browser_acc;
+void BrowserAccessibilityManagerWin::NotifyAccessibilityEvent(
+    ViewHostMsg_AccessibilityNotification_Params::NotificationType n,
+    BrowserAccessibility* node) {
+  LONG event_id;
+  switch (n) {
+    case ViewHostMsg_AccessibilityNotification_Params::
+          NOTIFICATION_TYPE_CHECK_STATE_CHANGED:
+      event_id = EVENT_OBJECT_STATECHANGE;
+      break;
+    case ViewHostMsg_AccessibilityNotification_Params::
+          NOTIFICATION_TYPE_CHILDREN_CHANGED:
+      event_id = EVENT_OBJECT_REORDER;
+      break;
+    case ViewHostMsg_AccessibilityNotification_Params::
+          NOTIFICATION_TYPE_FOCUS_CHANGED:
+      event_id = EVENT_OBJECT_FOCUS;
+      break;
+    case ViewHostMsg_AccessibilityNotification_Params::
+          NOTIFICATION_TYPE_LOAD_COMPLETE:
+      event_id = IA2_EVENT_DOCUMENT_LOAD_COMPLETE;
+      break;
+    case ViewHostMsg_AccessibilityNotification_Params::
+          NOTIFICATION_TYPE_VALUE_CHANGED:
+      event_id = EVENT_OBJECT_VALUECHANGE;
+      break;
+    case ViewHostMsg_AccessibilityNotification_Params::
+          NOTIFICATION_TYPE_SELECTED_TEXT_CHANGED:
+      event_id = IA2_EVENT_TEXT_CARET_MOVED;
   }
 
-  BrowserAccessibilityWin* new_browser_acc = CreateAccessibilityTree(
-        old_browser_acc->GetParent(),
-        child_id,
-        acc_obj,
-        old_browser_acc->index_in_parent());
-
-    if (old_browser_acc->GetParent()) {
-      old_browser_acc->GetParent()->ReplaceChild(
-          old_browser_acc,
-          new_browser_acc);
-    } else {
-      DCHECK_EQ(old_browser_acc, root_);
-      root_ = new_browser_acc;
-    }
-    old_browser_acc->InactivateTree();
-    old_browser_acc->Release();
-    child_id_map_[child_id] = new_browser_acc;
-
-    return new_browser_acc;
+  NotifyWinEvent(event_id, GetParentView(), OBJID_CLIENT, node->child_id());
 }
-
-void BrowserAccessibilityManagerWin::GotFocus() {
-  // TODO(ctguil): Remove when tree update logic handles focus changes.
-  if (!focus_)
-    return;
-
-  NotifyWinEvent(
-      EVENT_OBJECT_FOCUS,
-      GetParentWindow(),
-      OBJID_CLIENT,
-      focus_->child_id());
-}
-
-IAccessible* BrowserAccessibilityManagerWin::GetRootAccessible() {
-  return root_;
-}
-
-void BrowserAccessibilityManagerWin::OnAccessibilityObjectStateChange(
-    const webkit_glue::WebAccessibility& acc_obj) {
-  BrowserAccessibilityWin* new_browser_acc = UpdateTree(acc_obj);
-  if (!new_browser_acc)
-    return;
-
-  LONG child_id = new_browser_acc->child_id();
-  NotifyWinEvent(
-      EVENT_OBJECT_STATECHANGE, GetParentWindow(), OBJID_CLIENT, child_id);
-}
-
-void BrowserAccessibilityManagerWin::OnAccessibilityObjectChildrenChange(
-    const webkit_glue::WebAccessibility& acc_obj) {
-  BrowserAccessibilityWin* new_browser_acc = UpdateTree(acc_obj);
-  if (!new_browser_acc)
-    return;
-
-  LONG child_id;
-  if (root_ != new_browser_acc) {
-    child_id = new_browser_acc->GetParent()->child_id();
-  } else {
-    child_id = CHILDID_SELF;
-  }
-
-  NotifyWinEvent(
-      EVENT_OBJECT_REORDER, GetParentWindow(), OBJID_CLIENT, child_id);
-}
-
-void BrowserAccessibilityManagerWin::OnAccessibilityObjectFocusChange(
-  const webkit_glue::WebAccessibility& acc_obj) {
-  BrowserAccessibilityWin* new_browser_acc = UpdateTree(acc_obj);
-  if (!new_browser_acc)
-    return;
-
-  focus_ = new_browser_acc;
-  LONG child_id = new_browser_acc->child_id();
-  if (delegate_ && delegate_->HasFocus())
-    GotFocus();
-}
-
-void BrowserAccessibilityManagerWin::OnAccessibilityObjectLoadComplete(
-  const webkit_glue::WebAccessibility& acc_obj) {
-  root_->InactivateTree();
-  root_->Release();
-  focus_ = NULL;
-
-  root_ = CreateAccessibilityTree(NULL, GetNextChildID(), acc_obj, 0);
-  if (!focus_)
-    focus_ = root_;
-
-  NotifyWinEvent(
-      IA2_EVENT_DOCUMENT_LOAD_COMPLETE,
-      GetParentWindow(),
-      OBJID_CLIENT,
-      root_->child_id());
-  if (delegate_ && delegate_->HasFocus())
-    GotFocus();
-}
-
-void BrowserAccessibilityManagerWin::OnAccessibilityObjectValueChange(
-    const webkit_glue::WebAccessibility& acc_obj) {
-  BrowserAccessibilityWin* new_browser_acc = UpdateTree(acc_obj);
-  if (!new_browser_acc)
-    return;
-
-  LONG child_id = new_browser_acc->child_id();
-  NotifyWinEvent(
-      EVENT_OBJECT_VALUECHANGE, GetParentWindow(), OBJID_CLIENT, child_id);
-}
-
-void BrowserAccessibilityManagerWin::OnAccessibilityObjectTextChange(
-    const webkit_glue::WebAccessibility& acc_obj) {
-  BrowserAccessibilityWin* new_browser_acc = UpdateTree(acc_obj);
-  if (!new_browser_acc)
-    return;
-
-  LONG child_id = new_browser_acc->child_id();
-  NotifyWinEvent(
-      IA2_EVENT_TEXT_CARET_MOVED, GetParentWindow(), OBJID_CLIENT, child_id);
-}
-
-LONG BrowserAccessibilityManagerWin::GetNextChildID() {
-  // Get the next child ID, and wrap around when we get near the end
-  // of a 32-bit integer range. It's okay to wrap around; we just want
-  // to avoid it as long as possible because clients may cache the ID of
-  // an object for a while to determine if they've seen it before.
-  next_child_id_--;
-  if (next_child_id_ == -2000000000)
-    next_child_id_ = -1;
-
-  return next_child_id_;
-}
-
-BrowserAccessibilityWin*
-BrowserAccessibilityManagerWin::CreateAccessibilityTree(
-    BrowserAccessibilityWin* parent,
-    int child_id,
-    const webkit_glue::WebAccessibility& src,
-    int index_in_parent) {
-  BrowserAccessibilityWin* instance = factory_->Create();
-
-  instance->Initialize(this, parent, child_id, index_in_parent, src);
-  child_id_map_[child_id] = instance;
-  renderer_id_to_child_id_map_[src.id] = child_id;
-  if ((src.state >> WebAccessibility::STATE_FOCUSED) & 1)
-    focus_ = instance;
-  for (int i = 0; i < static_cast<int>(src.children.size()); ++i) {
-    BrowserAccessibilityWin* child = CreateAccessibilityTree(
-        instance, GetNextChildID(), src.children[i], i);
-    instance->AddChild(child);
-  }
-
-  return instance;
-}