Add direct DOM access (issue #511).

git-svn-id: https://chromiumembedded.googlecode.com/svn/trunk@610 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

libcef/renderer/browser_impl.cc

@@ -392,6 +392,24 @@ CefRefPtr<CefFrameImpl> CefBrowserImpl::GetWebFrameImpl(int64 frame_id) {
   return NULL;
 }
 
+void CefBrowserImpl::AddFrameObject(int64 frame_id,
+                                    CefTrackNode* tracked_object) {
+  CefRefPtr<CefTrackManager> manager;
+
+  if (!frame_objects_.empty()) {
+    FrameObjectMap::const_iterator it = frame_objects_.find(frame_id);
+    if (it != frame_objects_.end())
+      manager = it->second;
+  }
+
+  if (!manager.get()) {
+    manager = new CefTrackManager();
+    frame_objects_.insert(std::make_pair(frame_id, manager));
+  }
+
+  manager->Add(tracked_object);
+}
+
 
 // RenderViewObserver methods.
 // -----------------------------------------------------------------------------
@@ -417,11 +435,20 @@ void CefBrowserImpl::DidStartProvisionalLoad(WebKit::WebFrame* frame) {
 void CefBrowserImpl::FrameDetached(WebFrame* frame) {
   int64 frame_id = frame->identifier();
 
-  // Remove the frame from the map.
-  FrameMap::iterator it = frames_.find(frame_id);
-  DCHECK(it != frames_.end());
-  it->second->Detach();
-  frames_.erase(it);
+  {
+    // Remove the frame from the map.
+    FrameMap::iterator it = frames_.find(frame_id);
+    DCHECK(it != frames_.end());
+    it->second->Detach();
+    frames_.erase(it);
+  }
+
+  if (!frame_objects_.empty()) {
+    // Remove any tracked objects associated with the frame.
+    FrameObjectMap::iterator it = frame_objects_.find(frame_id);
+    if (it != frame_objects_.end())
+      frame_objects_.erase(it);
+  }
 
   // Notify the browser that the frame has detached.
   Send(new CefHostMsg_FrameDetached(routing_id(), frame_id));

libcef/renderer/browser_impl.h

@@ -14,6 +14,7 @@
 #include "include/cef_browser.h"
 #include "include/cef_client.h"
 #include "libcef/common/response_manager.h"
+#include "libcef/common/tracker.h"
 #include "libcef/renderer/frame_impl.h"
 
 #include "content/public/renderer/render_view_observer.h"
@@ -83,6 +84,9 @@ class CefBrowserImpl : public CefBrowser,
   CefRefPtr<CefFrameImpl> GetWebFrameImpl(WebKit::WebFrame* frame);
   CefRefPtr<CefFrameImpl> GetWebFrameImpl(int64 frame_id);
 
+  // Frame objects will be deleted immediately before the frame is closed.
+  void AddFrameObject(int64 frame_id, CefTrackNode* tracked_object);
+
   int browser_window_id() const { return browser_window_id_; }
   content::RenderView* render_view() {
     return content::RenderViewObserver::render_view();
@@ -115,6 +119,11 @@ class CefBrowserImpl : public CefBrowser,
   typedef std::map<int64, CefRefPtr<CefFrameImpl> > FrameMap;
   FrameMap frames_;
 
+  // Map of unique frame ids to CefTrackManager objects that need to be cleaned
+  // up when the frame is deleted.
+  typedef std::map<int64, CefRefPtr<CefTrackManager> > FrameObjectMap;
+  FrameObjectMap frame_objects_;
+
   // Manages response registrations.
   CefResponseManager response_manager_;
 

libcef/renderer/dom_document_impl.cc

@@ -0,0 +1,262 @@
+// Copyright (c) 2012 The Chromium Embedded Framework 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 "libcef/renderer/dom_document_impl.h"
+#include "libcef/renderer/dom_node_impl.h"
+#include "libcef/renderer/thread_util.h"
+
+#include "base/logging.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebDocument.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebElement.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebNode.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebRange.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebString.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebURL.h"
+
+using WebKit::WebDocument;
+using WebKit::WebElement;
+using WebKit::WebFrame;
+using WebKit::WebNode;
+using WebKit::WebRange;
+using WebKit::WebString;
+using WebKit::WebURL;
+
+
+CefDOMDocumentImpl::CefDOMDocumentImpl(CefBrowserImpl* browser,
+                                       WebFrame* frame)
+    : browser_(browser),
+      frame_(frame) {
+  const WebDocument& document = frame_->document();
+  DCHECK(!document.isNull());
+}
+
+CefDOMDocumentImpl::~CefDOMDocumentImpl() {
+  CEF_REQUIRE_RT();
+
+  // Verify that the Detach() method has been called.
+  DCHECK(frame_ == NULL);
+}
+
+CefDOMDocumentImpl::Type CefDOMDocumentImpl::GetType() {
+  if (!VerifyContext())
+    return DOM_DOCUMENT_TYPE_UNKNOWN;
+
+  const WebDocument& document = frame_->document();
+  if (document.isHTMLDocument())
+    return DOM_DOCUMENT_TYPE_HTML;
+  if (document.isXHTMLDocument())
+    return DOM_DOCUMENT_TYPE_XHTML;
+  if (document.isPluginDocument())
+    return DOM_DOCUMENT_TYPE_PLUGIN;
+  return DOM_DOCUMENT_TYPE_UNKNOWN;
+}
+
+CefRefPtr<CefDOMNode> CefDOMDocumentImpl::GetDocument() {
+  const WebDocument& document = frame_->document();
+  return GetOrCreateNode(document.document());
+}
+
+CefRefPtr<CefDOMNode> CefDOMDocumentImpl::GetBody() {
+  const WebDocument& document = frame_->document();
+  return GetOrCreateNode(document.body());
+}
+
+CefRefPtr<CefDOMNode> CefDOMDocumentImpl::GetHead() {
+  WebDocument document = frame_->document();
+  return GetOrCreateNode(document.head());
+}
+
+CefString CefDOMDocumentImpl::GetTitle() {
+  CefString str;
+  if (!VerifyContext())
+    return str;
+
+  const WebDocument& document = frame_->document();
+  const WebString& title = document.title();
+  if (!title.isNull())
+    str = title;
+
+  return str;
+}
+
+CefRefPtr<CefDOMNode> CefDOMDocumentImpl::GetElementById(const CefString& id) {
+  const WebDocument& document = frame_->document();
+  return GetOrCreateNode(document.getElementById(string16(id)));
+}
+
+CefRefPtr<CefDOMNode> CefDOMDocumentImpl::GetFocusedNode() {
+  const WebDocument& document = frame_->document();
+  return GetOrCreateNode(document.focusedNode());
+}
+
+bool CefDOMDocumentImpl::HasSelection() {
+  if (!VerifyContext())
+    return false;
+
+  return frame_->hasSelection();
+}
+
+CefRefPtr<CefDOMNode> CefDOMDocumentImpl::GetSelectionStartNode() {
+  if (!VerifyContext() || !frame_->hasSelection())
+    return NULL;
+
+  const WebRange& range = frame_->selectionRange();
+  if (range.isNull())
+    return NULL;
+
+  int exceptionCode;
+  return GetOrCreateNode(range.startContainer(exceptionCode));
+}
+
+int CefDOMDocumentImpl::GetSelectionStartOffset() {
+  if (!VerifyContext() || !frame_->hasSelection())
+    return 0;
+
+  const WebRange& range = frame_->selectionRange();
+  if (range.isNull())
+    return 0;
+
+  return range.startOffset();
+}
+
+CefRefPtr<CefDOMNode> CefDOMDocumentImpl::GetSelectionEndNode() {
+  if (!VerifyContext() || !frame_->hasSelection())
+    return NULL;
+
+  const WebRange& range = frame_->selectionRange();
+  if (range.isNull())
+    return NULL;
+
+  int exceptionCode;
+  return GetOrCreateNode(range.endContainer(exceptionCode));
+}
+
+int CefDOMDocumentImpl::GetSelectionEndOffset() {
+  if (!VerifyContext() || !frame_->hasSelection())
+    return 0;
+
+  const WebRange& range = frame_->selectionRange();
+  if (range.isNull())
+    return 0;
+
+  return range.endOffset();
+}
+
+CefString CefDOMDocumentImpl::GetSelectionAsMarkup() {
+  CefString str;
+  if (!VerifyContext() || !frame_->hasSelection())
+    return str;
+
+  const WebString& markup = frame_->selectionAsMarkup();
+  if (!markup.isNull())
+    str = markup;
+
+  return str;
+}
+
+CefString CefDOMDocumentImpl::GetSelectionAsText() {
+  CefString str;
+  if (!VerifyContext() || !frame_->hasSelection())
+    return str;
+
+  const WebString& text = frame_->selectionAsText();
+  if (!text.isNull())
+    str = text;
+
+  return str;
+}
+
+CefString CefDOMDocumentImpl::GetBaseURL() {
+  CefString str;
+  if (!VerifyContext())
+    return str;
+
+  const WebDocument& document = frame_->document();
+  const WebURL& url = document.baseURL();
+  if (!url.isNull()) {
+    GURL gurl = url;
+    str = gurl.spec();
+  }
+
+  return str;
+}
+
+CefString CefDOMDocumentImpl::GetCompleteURL(const CefString& partialURL) {
+  CefString str;
+  if (!VerifyContext())
+    return str;
+
+  const WebDocument& document = frame_->document();
+  const WebURL& url = document.completeURL(string16(partialURL));
+  if (!url.isNull()) {
+    GURL gurl = url;
+    str = gurl.spec();
+  }
+
+  return str;
+}
+
+CefRefPtr<CefDOMNode> CefDOMDocumentImpl::GetOrCreateNode(
+    const WebKit::WebNode& node) {
+  if (!VerifyContext())
+    return NULL;
+
+  // Nodes may potentially be null.
+  if (node.isNull())
+    return NULL;
+
+  if (!node_map_.empty()) {
+    // Locate the existing node, if any.
+    NodeMap::const_iterator it = node_map_.find(node);
+    if (it != node_map_.end())
+      return it->second;
+  }
+
+  // Create the new node object.
+  CefRefPtr<CefDOMNode> nodeImpl(new CefDOMNodeImpl(this, node));
+  node_map_.insert(std::make_pair(node, nodeImpl));
+  return nodeImpl;
+}
+
+void CefDOMDocumentImpl::RemoveNode(const WebKit::WebNode& node) {
+  if (!VerifyContext())
+    return;
+
+  if (!node_map_.empty()) {
+    NodeMap::iterator it = node_map_.find(node);
+    if (it != node_map_.end())
+      node_map_.erase(it);
+  }
+}
+
+void CefDOMDocumentImpl::Detach() {
+  if (!VerifyContext())
+    return;
+
+  // If you hit this assert it means that you are keeping references to node
+  // objects beyond the valid scope.
+  DCHECK(node_map_.empty());
+
+  // If you hit this assert it means that you are keeping references to this
+  // document object beyond the valid scope.
+  DCHECK_EQ(GetRefCt(), 1);
+
+  if (!node_map_.empty()) {
+    NodeMap::const_iterator it = node_map_.begin();
+    for (; it != node_map_.end(); ++it)
+      static_cast<CefDOMNodeImpl*>(it->second)->Detach();
+    node_map_.clear();
+  }
+
+  frame_ = NULL;
+}
+
+bool CefDOMDocumentImpl::VerifyContext() {
+  if (!CEF_CURRENTLY_ON_RT() || frame_ == NULL) {
+    NOTREACHED();
+    return false;
+  }
+  return true;
+}

libcef/renderer/dom_document_impl.h

@@ -0,0 +1,66 @@
+// Copyright (c) 2012 The Chromium Embedded Framework 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 CEF_LIBCEF_DOM_DOCUMENT_IMPL_H_
+#define CEF_LIBCEF_DOM_DOCUMENT_IMPL_H_
+#pragma once
+
+#include <map>
+#include "include/cef_dom.h"
+
+namespace WebKit {
+class WebFrame;
+class WebNode;
+};
+
+class CefBrowserImpl;
+
+class CefDOMDocumentImpl : public CefDOMDocument {
+ public:
+  CefDOMDocumentImpl(CefBrowserImpl* browser,
+                     WebKit::WebFrame* frame);
+  virtual ~CefDOMDocumentImpl();
+
+  // CefDOMDocument methods.
+  virtual Type GetType() OVERRIDE;
+  virtual CefRefPtr<CefDOMNode> GetDocument() OVERRIDE;
+  virtual CefRefPtr<CefDOMNode> GetBody() OVERRIDE;
+  virtual CefRefPtr<CefDOMNode> GetHead() OVERRIDE;
+  virtual CefString GetTitle() OVERRIDE;
+  virtual CefRefPtr<CefDOMNode> GetElementById(const CefString& id) OVERRIDE;
+  virtual CefRefPtr<CefDOMNode> GetFocusedNode() OVERRIDE;
+  virtual bool HasSelection() OVERRIDE;
+  virtual CefRefPtr<CefDOMNode> GetSelectionStartNode() OVERRIDE;
+  virtual int GetSelectionStartOffset() OVERRIDE;
+  virtual CefRefPtr<CefDOMNode> GetSelectionEndNode() OVERRIDE;
+  virtual int GetSelectionEndOffset() OVERRIDE;
+  virtual CefString GetSelectionAsMarkup() OVERRIDE;
+  virtual CefString GetSelectionAsText() OVERRIDE;
+  virtual CefString GetBaseURL() OVERRIDE;
+  virtual CefString GetCompleteURL(const CefString& partialURL) OVERRIDE;
+
+  CefBrowserImpl* GetBrowser() { return browser_; }
+  WebKit::WebFrame* GetFrame() { return frame_; }
+
+  // The document maintains a map of all existing node objects.
+  CefRefPtr<CefDOMNode> GetOrCreateNode(const WebKit::WebNode& node);
+  void RemoveNode(const WebKit::WebNode& node);
+
+  // Must be called before the object is destroyed.
+  void Detach();
+
+  // Verify that the object exists and is being accessed on the UI thread.
+  bool VerifyContext();
+
+ protected:
+  CefBrowserImpl* browser_;
+  WebKit::WebFrame* frame_;
+
+  typedef std::map<WebKit::WebNode, CefDOMNode*> NodeMap;
+  NodeMap node_map_;
+
+  IMPLEMENT_REFCOUNTING(CefDOMDocumentImpl);
+};
+
+#endif  // CEF_LIBCEF_DOM_DOCUMENT_IMPL_H_

libcef/renderer/dom_event_impl.cc

@@ -0,0 +1,160 @@
+// Copyright (c) 2012 The Chromium Embedded Framework 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 "libcef/renderer/dom_event_impl.h"
+#include "libcef/renderer/dom_document_impl.h"
+#include "libcef/renderer/thread_util.h"
+
+#include "base/logging.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebDOMEvent.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebString.h"
+
+using WebKit::WebDOMEvent;
+using WebKit::WebString;
+
+
+CefDOMEventImpl::CefDOMEventImpl(CefRefPtr<CefDOMDocumentImpl> document,
+                                 const WebKit::WebDOMEvent& event)
+    : document_(document),
+      event_(event) {
+  DCHECK(!event_.isNull());
+}
+
+CefDOMEventImpl::~CefDOMEventImpl() {
+  CEF_REQUIRE_RT();
+  DCHECK(event_.isNull());
+}
+
+CefString CefDOMEventImpl::GetType() {
+  CefString str;
+  if (!VerifyContext())
+    return str;
+
+  const WebString& type = event_.type();
+  if (!type.isNull())
+    str = type;
+
+  return str;
+}
+
+CefDOMEventImpl::Category CefDOMEventImpl::GetCategory() {
+  if (!VerifyContext())
+    return DOM_EVENT_CATEGORY_UNKNOWN;
+
+  int flags = 0;
+  if (event_.isUIEvent())
+    flags |= DOM_EVENT_CATEGORY_UI;
+  if (event_.isMouseEvent())
+    flags |= DOM_EVENT_CATEGORY_MOUSE;
+  if (event_.isMutationEvent())
+    flags |= DOM_EVENT_CATEGORY_MUTATION;
+  if (event_.isKeyboardEvent())
+    flags |= DOM_EVENT_CATEGORY_KEYBOARD;
+  if (event_.isTextEvent())
+    flags |= DOM_EVENT_CATEGORY_TEXT;
+  if (event_.isCompositionEvent())
+    flags |= DOM_EVENT_CATEGORY_COMPOSITION;
+  if (event_.isDragEvent())
+    flags |= DOM_EVENT_CATEGORY_DRAG;
+  if (event_.isClipboardEvent())
+    flags |= DOM_EVENT_CATEGORY_CLIPBOARD;
+  if (event_.isMessageEvent())
+    flags |= DOM_EVENT_CATEGORY_MESSAGE;
+  if (event_.isWheelEvent())
+    flags |= DOM_EVENT_CATEGORY_WHEEL;
+  if (event_.isBeforeTextInsertedEvent())
+    flags |= DOM_EVENT_CATEGORY_BEFORE_TEXT_INSERTED;
+  if (event_.isOverflowEvent())
+    flags |= DOM_EVENT_CATEGORY_OVERFLOW;
+  if (event_.isPageTransitionEvent())
+    flags |= DOM_EVENT_CATEGORY_PAGE_TRANSITION;
+  if (event_.isPopStateEvent())
+    flags |= DOM_EVENT_CATEGORY_POPSTATE;
+  if (event_.isProgressEvent())
+    flags |= DOM_EVENT_CATEGORY_PROGRESS;
+  if (event_.isXMLHttpRequestProgressEvent())
+    flags |= DOM_EVENT_CATEGORY_XMLHTTPREQUEST_PROGRESS;
+  if (event_.isWebKitAnimationEvent())
+    flags |= DOM_EVENT_CATEGORY_WEBKIT_ANIMATION;
+  if (event_.isWebKitTransitionEvent())
+    flags |= DOM_EVENT_CATEGORY_WEBKIT_TRANSITION;
+  if (event_.isBeforeLoadEvent())
+    flags |= DOM_EVENT_CATEGORY_BEFORE_LOAD;
+
+  return static_cast<Category>(flags);
+}
+
+CefDOMEventImpl::Phase CefDOMEventImpl::GetPhase() {
+  if (!VerifyContext())
+    return DOM_EVENT_PHASE_UNKNOWN;
+
+  switch (event_.eventPhase()) {
+    case WebDOMEvent::CapturingPhase:
+      return DOM_EVENT_PHASE_CAPTURING;
+    case WebDOMEvent::AtTarget:
+      return DOM_EVENT_PHASE_AT_TARGET;
+    case WebDOMEvent::BubblingPhase:
+      return DOM_EVENT_PHASE_BUBBLING;
+  }
+
+  return DOM_EVENT_PHASE_UNKNOWN;
+}
+
+bool CefDOMEventImpl::CanBubble() {
+  if (!VerifyContext())
+    return false;
+
+  return event_.bubbles();
+}
+
+bool CefDOMEventImpl::CanCancel() {
+  if (!VerifyContext())
+    return false;
+
+  return event_.cancelable();
+}
+
+CefRefPtr<CefDOMDocument> CefDOMEventImpl::GetDocument() {
+  if (!VerifyContext())
+    return NULL;
+
+  return document_.get();
+}
+
+CefRefPtr<CefDOMNode> CefDOMEventImpl::GetTarget() {
+  if (!VerifyContext())
+    return NULL;
+
+  return document_->GetOrCreateNode(event_.target());
+}
+
+CefRefPtr<CefDOMNode> CefDOMEventImpl::GetCurrentTarget() {
+  if (!VerifyContext())
+    return NULL;
+
+  return document_->GetOrCreateNode(event_.currentTarget());
+}
+
+void CefDOMEventImpl::Detach() {
+  // If you hit this assert it means that you are keeping references to this
+  // event object beyond the valid scope.
+  DCHECK_EQ(GetRefCt(), 1);
+
+  document_ = NULL;
+  event_.assign(WebDOMEvent());
+}
+
+bool CefDOMEventImpl::VerifyContext() {
+  if (!document_.get()) {
+    NOTREACHED();
+    return false;
+  }
+  if (!document_->VerifyContext())
+    return false;
+  if (event_.isNull()) {
+    NOTREACHED();
+    return false;
+  }
+  return true;
+}

libcef/renderer/dom_event_impl.h

@@ -0,0 +1,43 @@
+// Copyright (c) 2012 The Chromium Embedded Framework 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 CEF_LIBCEF_DOM_EVENT_IMPL_H_
+#define CEF_LIBCEF_DOM_EVENT_IMPL_H_
+#pragma once
+
+#include "include/cef_dom.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebDOMEvent.h"
+
+class CefDOMDocumentImpl;
+
+class CefDOMEventImpl : public CefDOMEvent {
+ public:
+  CefDOMEventImpl(CefRefPtr<CefDOMDocumentImpl> document,
+                  const WebKit::WebDOMEvent& event);
+  virtual ~CefDOMEventImpl();
+
+  // CefDOMEvent methods.
+  virtual CefString GetType() OVERRIDE;
+  virtual Category GetCategory() OVERRIDE;
+  virtual Phase GetPhase() OVERRIDE;
+  virtual bool CanBubble() OVERRIDE;
+  virtual bool CanCancel() OVERRIDE;
+  virtual CefRefPtr<CefDOMDocument> GetDocument() OVERRIDE;
+  virtual CefRefPtr<CefDOMNode> GetTarget() OVERRIDE;
+  virtual CefRefPtr<CefDOMNode> GetCurrentTarget() OVERRIDE;
+
+  // Will be called from CefDOMEventListenerWrapper::handleEvent().
+  void Detach();
+
+  // Verify that the object exists and is being accessed on the UI thread.
+  bool VerifyContext();
+
+ protected:
+  CefRefPtr<CefDOMDocumentImpl> document_;
+  WebKit::WebDOMEvent event_;
+
+  IMPLEMENT_REFCOUNTING(CefDOMEventImpl);
+};
+
+#endif  // CEF_LIBCEF_DOM_EVENT_IMPL_H_

libcef/renderer/dom_node_impl.cc

@@ -0,0 +1,459 @@
+// Copyright (c) 2012 The Chromium Embedded Framework 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 "libcef/renderer/dom_node_impl.h"
+#include "libcef/common/tracker.h"
+#include "libcef/renderer/browser_impl.h"
+#include "libcef/renderer/dom_document_impl.h"
+#include "libcef/renderer/dom_event_impl.h"
+#include "libcef/renderer/thread_util.h"
+
+#include "base/logging.h"
+#include "base/string_util.h"
+#include "base/utf_string_conversions.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebDocument.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebDOMEvent.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebDOMEventListener.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebElement.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebFormControlElement.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebInputElement.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebNode.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebSelectElement.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebString.h"
+
+using WebKit::WebDocument;
+using WebKit::WebDOMEvent;
+using WebKit::WebDOMEventListener;
+using WebKit::WebElement;
+using WebKit::WebFrame;
+using WebKit::WebFormControlElement;
+using WebKit::WebInputElement;
+using WebKit::WebNode;
+using WebKit::WebSelectElement;
+using WebKit::WebString;
+
+namespace {
+
+// Wrapper implementation for WebDOMEventListener.
+class CefDOMEventListenerWrapper : public WebDOMEventListener,
+                                   public CefTrackNode {
+ public:
+  CefDOMEventListenerWrapper(CefBrowserImpl* browser, WebFrame* frame,
+                             CefRefPtr<CefDOMEventListener> listener)
+    : browser_(browser),
+      frame_(frame),
+      listener_(listener) {
+    // Cause this object to be deleted immediately before the frame is closed.
+    browser->AddFrameObject(frame->identifier(), this);
+  }
+  virtual ~CefDOMEventListenerWrapper() {
+    CEF_REQUIRE_RT();
+  }
+
+  virtual void handleEvent(const WebDOMEvent& event) {
+    CefRefPtr<CefDOMDocumentImpl> documentImpl;
+    CefRefPtr<CefDOMEventImpl> eventImpl;
+
+    if (!event.isNull()) {
+      // Create CefDOMDocumentImpl and CefDOMEventImpl objects that are valid
+      // only for the scope of this method.
+      const WebDocument& document = frame_->document();
+      if (!document.isNull()) {
+        documentImpl = new CefDOMDocumentImpl(browser_, frame_);
+        eventImpl = new CefDOMEventImpl(documentImpl, event);
+      }
+    }
+
+    listener_->HandleEvent(eventImpl.get());
+
+    if (eventImpl.get())
+      eventImpl->Detach();
+    if (documentImpl.get())
+      documentImpl->Detach();
+  }
+
+ protected:
+  CefBrowserImpl* browser_;
+  WebFrame* frame_;
+  CefRefPtr<CefDOMEventListener> listener_;
+};
+
+}  // namespace
+
+
+CefDOMNodeImpl::CefDOMNodeImpl(CefRefPtr<CefDOMDocumentImpl> document,
+                               const WebKit::WebNode& node)
+    : document_(document),
+      node_(node) {
+}
+
+CefDOMNodeImpl::~CefDOMNodeImpl() {
+  CEF_REQUIRE_RT();
+
+  if (document_.get() && !node_.isNull()) {
+    // Remove the node from the document.
+    document_->RemoveNode(node_);
+  }
+}
+
+CefDOMNodeImpl::Type CefDOMNodeImpl::GetType() {
+  if (!VerifyContext())
+    return DOM_NODE_TYPE_UNSUPPORTED;
+
+  switch (node_.nodeType()) {
+    case WebNode::ElementNode:
+      return DOM_NODE_TYPE_ELEMENT;
+    case WebNode::AttributeNode:
+      return DOM_NODE_TYPE_ATTRIBUTE;
+    case WebNode::TextNode:
+      return DOM_NODE_TYPE_TEXT;
+    case WebNode::CDataSectionNode:
+      return DOM_NODE_TYPE_CDATA_SECTION;
+    case WebNode::EntityReferenceNode:
+      return DOM_NODE_TYPE_ENTITY_REFERENCE;
+    case WebNode::EntityNode:
+      return DOM_NODE_TYPE_ENTITY;
+    case WebNode::ProcessingInstructionsNode:
+      return DOM_NODE_TYPE_PROCESSING_INSTRUCTIONS;
+    case WebNode::CommentNode:
+      return DOM_NODE_TYPE_COMMENT;
+    case WebNode::DocumentNode:
+      return DOM_NODE_TYPE_DOCUMENT;
+    case WebNode::DocumentTypeNode:
+      return DOM_NODE_TYPE_DOCUMENT_TYPE;
+    case WebNode::DocumentFragmentNode:
+      return DOM_NODE_TYPE_DOCUMENT_FRAGMENT;
+    case WebNode::NotationNode:
+      return DOM_NODE_TYPE_NOTATION;
+    case WebNode::XPathNamespaceNode:
+      return DOM_NODE_TYPE_XPATH_NAMESPACE;
+    default:
+      return DOM_NODE_TYPE_UNSUPPORTED;
+  }
+}
+
+bool CefDOMNodeImpl::IsText() {
+  if (!VerifyContext())
+    return false;
+
+  return node_.isTextNode();
+}
+
+bool CefDOMNodeImpl::IsElement() {
+  if (!VerifyContext())
+    return false;
+
+  return node_.isElementNode();
+}
+
+bool CefDOMNodeImpl::IsFormControlElement() {
+  if (!VerifyContext())
+    return false;
+
+  if (node_.isElementNode()) {
+    const WebElement& element = node_.toConst<WebElement>();
+    return element.isFormControlElement();
+  }
+
+  return false;
+}
+
+CefString CefDOMNodeImpl::GetFormControlElementType() {
+  CefString str;
+  if (!VerifyContext())
+    return str;
+
+  if (node_.isElementNode()) {
+    const WebElement& element = node_.toConst<WebElement>();
+    if (element.isFormControlElement()) {
+      // Retrieve the type from the form control element.
+      const WebFormControlElement& formElement =
+          node_.toConst<WebFormControlElement>();
+
+      const string16& form_control_type = formElement.formControlType();
+      str = form_control_type;
+    }
+  }
+
+  return str;
+}
+
+bool CefDOMNodeImpl::IsSame(CefRefPtr<CefDOMNode> that) {
+  if (!VerifyContext())
+    return false;
+
+  CefDOMNodeImpl* impl = static_cast<CefDOMNodeImpl*>(that.get());
+  if (!impl || !impl->VerifyContext())
+    return false;
+
+  return node_.equals(impl->node_);
+}
+
+CefString CefDOMNodeImpl::GetName() {
+  CefString str;
+  if (!VerifyContext())
+    return str;
+
+  const WebString& name = node_.nodeName();
+  if (!name.isNull())
+    str = name;
+
+  return str;
+}
+
+CefString CefDOMNodeImpl::GetValue() {
+  CefString str;
+  if (!VerifyContext())
+    return str;
+
+  if (node_.isElementNode()) {
+    const WebElement& element = node_.toConst<WebElement>();
+    if (element.isFormControlElement()) {
+      // Retrieve the value from the form control element.
+      const WebFormControlElement& formElement =
+          node_.toConst<WebFormControlElement>();
+
+      string16 value;
+      const string16& form_control_type = formElement.formControlType();
+      if (form_control_type == ASCIIToUTF16("text")) {
+        const WebInputElement& input_element =
+            formElement.toConst<WebInputElement>();
+        value = input_element.value();
+      } else if (form_control_type == ASCIIToUTF16("select-one")) {
+        const WebSelectElement& select_element =
+            formElement.toConst<WebSelectElement>();
+        value = select_element.value();
+      }
+
+      TrimWhitespace(value, TRIM_LEADING, &value);
+      str = value;
+    }
+  }
+
+  if (str.empty()) {
+    const WebString& value = node_.nodeValue();
+    if (!value.isNull())
+      str = value;
+  }
+
+  return str;
+}
+
+bool CefDOMNodeImpl::SetValue(const CefString& value) {
+  if (!VerifyContext())
+    return false;
+
+  if (node_.isElementNode())
+    return false;
+
+  return node_.setNodeValue(string16(value));
+}
+
+CefString CefDOMNodeImpl::GetAsMarkup() {
+  CefString str;
+  if (!VerifyContext())
+    return str;
+
+  const WebString& markup = node_.createMarkup();
+  if (!markup.isNull())
+    str = markup;
+
+  return str;
+}
+
+CefRefPtr<CefDOMDocument> CefDOMNodeImpl::GetDocument() {
+  if (!VerifyContext())
+    return NULL;
+
+  return document_.get();
+}
+
+CefRefPtr<CefDOMNode> CefDOMNodeImpl::GetParent() {
+  if (!VerifyContext())
+    return NULL;
+
+  return document_->GetOrCreateNode(node_.parentNode());
+}
+
+CefRefPtr<CefDOMNode> CefDOMNodeImpl::GetPreviousSibling() {
+  if (!VerifyContext())
+    return NULL;
+
+  return document_->GetOrCreateNode(node_.previousSibling());
+}
+
+CefRefPtr<CefDOMNode> CefDOMNodeImpl::GetNextSibling() {
+  if (!VerifyContext())
+    return NULL;
+
+  return document_->GetOrCreateNode(node_.nextSibling());
+}
+
+bool CefDOMNodeImpl::HasChildren() {
+  if (!VerifyContext())
+    return false;
+
+  return node_.hasChildNodes();
+}
+
+CefRefPtr<CefDOMNode> CefDOMNodeImpl::GetFirstChild() {
+  if (!VerifyContext())
+    return NULL;
+
+  return document_->GetOrCreateNode(node_.firstChild());
+}
+
+CefRefPtr<CefDOMNode> CefDOMNodeImpl::GetLastChild() {
+  if (!VerifyContext())
+    return NULL;
+
+  return document_->GetOrCreateNode(node_.lastChild());
+}
+
+void CefDOMNodeImpl::AddEventListener(const CefString& eventType,
+                                      CefRefPtr<CefDOMEventListener> listener,
+                                      bool useCapture) {
+  if (!VerifyContext())
+    return;
+
+  node_.addEventListener(string16(eventType),
+      new CefDOMEventListenerWrapper(document_->GetBrowser(),
+          document_->GetFrame(), listener),
+      useCapture);
+}
+
+CefString CefDOMNodeImpl::GetElementTagName() {
+  CefString str;
+  if (!VerifyContext())
+    return str;
+
+  if (!node_.isElementNode()) {
+    NOTREACHED();
+    return str;
+  }
+
+  const WebElement& element = node_.toConst<WebKit::WebElement>();
+  const WebString& tagname = element.tagName();
+  if (!tagname.isNull())
+    str = tagname;
+
+  return str;
+}
+
+bool CefDOMNodeImpl::HasElementAttributes() {
+  if (!VerifyContext())
+    return false;
+
+  if (!node_.isElementNode()) {
+    NOTREACHED();
+    return false;
+  }
+
+  const WebElement& element = node_.toConst<WebKit::WebElement>();
+  return (element.attributeCount() > 0);
+}
+
+bool CefDOMNodeImpl::HasElementAttribute(const CefString& attrName) {
+  if (!VerifyContext())
+    return false;
+
+  if (!node_.isElementNode()) {
+    NOTREACHED();
+    return false;
+  }
+
+  const WebElement& element = node_.toConst<WebKit::WebElement>();
+  return element.hasAttribute(string16(attrName));
+}
+
+CefString CefDOMNodeImpl::GetElementAttribute(const CefString& attrName) {
+  CefString str;
+  if (!VerifyContext())
+    return str;
+
+  if (!node_.isElementNode()) {
+    NOTREACHED();
+    return str;
+  }
+
+  const WebElement& element = node_.toConst<WebKit::WebElement>();
+  const WebString& attr = element.getAttribute(string16(attrName));
+  if (!attr.isNull())
+    str = attr;
+
+  return str;
+}
+
+void CefDOMNodeImpl::GetElementAttributes(AttributeMap& attrMap) {
+  if (!VerifyContext())
+    return;
+
+  if (!node_.isElementNode()) {
+    NOTREACHED();
+    return;
+  }
+
+  const WebElement& element = node_.toConst<WebKit::WebElement>();
+  unsigned int len = element.attributeCount();
+  if (len == 0)
+    return;
+
+  for (unsigned int i = 0; i < len; ++i) {
+    string16 name = element.attributeLocalName(i);
+    string16 value = element.attributeValue(i);
+    attrMap.insert(std::make_pair(name, value));
+  }
+}
+
+bool CefDOMNodeImpl::SetElementAttribute(const CefString& attrName,
+                                         const CefString& value) {
+  if (!VerifyContext())
+    return false;
+
+  if (!node_.isElementNode()) {
+    NOTREACHED();
+    return false;
+  }
+
+  WebElement element = node_.to<WebKit::WebElement>();
+  return element.setAttribute(string16(attrName), string16(value));
+}
+
+CefString CefDOMNodeImpl::GetElementInnerText() {
+  CefString str;
+  if (!VerifyContext())
+    return str;
+
+  if (!node_.isElementNode()) {
+    NOTREACHED();
+    return str;
+  }
+
+  WebElement element = node_.to<WebKit::WebElement>();
+  const WebString& text = element.innerText();
+  if (!text.isNull())
+    str = text;
+
+  return str;
+}
+
+void CefDOMNodeImpl::Detach() {
+  document_ = NULL;
+  node_.assign(WebNode());
+}
+
+bool CefDOMNodeImpl::VerifyContext() {
+  if (!document_.get()) {
+    NOTREACHED();
+    return false;
+  }
+  if (!document_->VerifyContext())
+    return false;
+  if (node_.isNull()) {
+    NOTREACHED();
+    return false;
+  }
+  return true;
+}

libcef/renderer/dom_node_impl.h

@@ -0,0 +1,63 @@
+// Copyright (c) 2012 The Chromium Embedded Framework 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 CEF_LIBCEF_DOM_NODE_IMPL_H_
+#define CEF_LIBCEF_DOM_NODE_IMPL_H_
+#pragma once
+
+#include "include/cef_dom.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebNode.h"
+
+class CefDOMDocumentImpl;
+
+class CefDOMNodeImpl : public CefDOMNode {
+ public:
+  CefDOMNodeImpl(CefRefPtr<CefDOMDocumentImpl> document,
+                 const WebKit::WebNode& node);
+  virtual ~CefDOMNodeImpl();
+
+  // CefDOMNode methods.
+  virtual Type GetType() OVERRIDE;
+  virtual bool IsText() OVERRIDE;
+  virtual bool IsElement() OVERRIDE;
+  virtual bool IsFormControlElement() OVERRIDE;
+  virtual CefString GetFormControlElementType() OVERRIDE;
+  virtual bool IsSame(CefRefPtr<CefDOMNode> that) OVERRIDE;
+  virtual CefString GetName() OVERRIDE;
+  virtual CefString GetValue() OVERRIDE;
+  virtual bool SetValue(const CefString& value) OVERRIDE;
+  virtual CefString GetAsMarkup() OVERRIDE;
+  virtual CefRefPtr<CefDOMDocument> GetDocument() OVERRIDE;
+  virtual CefRefPtr<CefDOMNode> GetParent() OVERRIDE;
+  virtual CefRefPtr<CefDOMNode> GetPreviousSibling() OVERRIDE;
+  virtual CefRefPtr<CefDOMNode> GetNextSibling() OVERRIDE;
+  virtual bool HasChildren() OVERRIDE;
+  virtual CefRefPtr<CefDOMNode> GetFirstChild() OVERRIDE;
+  virtual CefRefPtr<CefDOMNode> GetLastChild() OVERRIDE;
+  virtual void AddEventListener(const CefString& eventType,
+                                CefRefPtr<CefDOMEventListener> listener,
+                                bool useCapture) OVERRIDE;
+  virtual CefString GetElementTagName() OVERRIDE;
+  virtual bool HasElementAttributes() OVERRIDE;
+  virtual bool HasElementAttribute(const CefString& attrName) OVERRIDE;
+  virtual CefString GetElementAttribute(const CefString& attrName) OVERRIDE;
+  virtual void GetElementAttributes(AttributeMap& attrMap) OVERRIDE;
+  virtual bool SetElementAttribute(const CefString& attrName,
+                                   const CefString& value) OVERRIDE;
+  virtual CefString GetElementInnerText() OVERRIDE;
+
+  // Will be called from CefDOMDocumentImpl::Detach().
+  void Detach();
+
+  // Verify that the object exists and is being accessed on the UI thread.
+  bool VerifyContext();
+
+ protected:
+  CefRefPtr<CefDOMDocumentImpl> document_;
+  WebKit::WebNode node_;
+
+  IMPLEMENT_REFCOUNTING(CefDOMNodeImpl);
+};
+
+#endif  // CEF_LIBCEF_DOM_NODE_IMPL_H_

libcef/renderer/frame_impl.cc

@@ -8,6 +8,7 @@
 #include "libcef/common/http_header_utils.h"
 #include "libcef/common/request_impl.h"
 #include "libcef/renderer/browser_impl.h"
+#include "libcef/renderer/dom_document_impl.h"
 #include "libcef/renderer/thread_util.h"
 #include "libcef/renderer/v8_impl.h"
 #include "libcef/renderer/webkit_glue.h"
@@ -240,6 +241,25 @@ CefRefPtr<CefV8Context> CefFrameImpl::GetV8Context() {
   }
 }
 
+void CefFrameImpl::VisitDOM(CefRefPtr<CefDOMVisitor> visitor) {
+  CEF_REQUIRE_RT_RETURN_VOID();
+
+  if (!frame_)
+    return;
+
+  // Create a CefDOMDocumentImpl object that is valid only for the scope of this
+  // method.
+  CefRefPtr<CefDOMDocumentImpl> documentImpl;
+  const WebKit::WebDocument& document = frame_->document();
+  if (!document.isNull())
+    documentImpl = new CefDOMDocumentImpl(browser_, frame_);
+
+  visitor->Visit(documentImpl.get());
+
+  if (documentImpl.get())
+    documentImpl->Detach();
+}
+
 void CefFrameImpl::Detach() {
   browser_ = NULL;
   frame_ = NULL;

libcef/renderer/frame_impl.h

@@ -52,6 +52,7 @@ class CefFrameImpl : public CefFrame {
   virtual CefString GetURL() OVERRIDE;
   virtual CefRefPtr<CefBrowser> GetBrowser() OVERRIDE;
   virtual CefRefPtr<CefV8Context> GetV8Context() OVERRIDE;
+  virtual void VisitDOM(CefRefPtr<CefDOMVisitor> visitor) OVERRIDE;
 
   void Detach();