Initial import of the Chrome Frame codebase. Integration in chrome.gyp coming...

chrome_frame/np_event_listener.h

+// Copyright (c) 2009 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 CHROME_FRAME_NP_EVENT_LISTENER_H_
+#define CHROME_FRAME_NP_EVENT_LISTENER_H_
+
+#include "base/logging.h"
+
+#include "chrome_frame/utils.h"
+#include "chrome_frame/np_browser_functions.h"
+
+// Avoid conflicts with basictypes and the gecko sdk.
+// (different definitions of uint32).
+#define NO_NSPR_10_SUPPORT
+#include "third_party/xulrunner-sdk/win/include/dom/nsIDOMEventListener.h"
+
+
+class nsIDOMElement;
+
+class NpEventDelegate {
+ public:
+  virtual void OnEvent(const char* event_name) = 0;
+};
+
+class NpEventListener {
+ public:
+  NS_IMETHOD_(nsrefcnt) AddRef() = 0;
+  NS_IMETHOD_(nsrefcnt) Release() = 0;
+  virtual bool Subscribe(NPP instance,
+                         const char* event_names[],
+                         int event_name_count) = 0;
+  virtual bool Unsubscribe(NPP instance,
+                           const char* event_names[],
+                           int event_name_count) = 0;
+};
+
+// A little helper class to implement simple ref counting
+// and assert on single threadedness.
+template <class T>
+class NpEventListenerBase : public NpEventListener {
+ public:
+  NpEventListenerBase(NpEventDelegate* delegate)
+      : ref_count_(0), delegate_(delegate) {
+    DCHECK(delegate_);
+    thread_id_ = ::GetCurrentThreadId();
+  }
+
+  ~NpEventListenerBase() {
+    DCHECK(thread_id_ == ::GetCurrentThreadId());
+  }
+
+  NS_IMETHOD_(nsrefcnt) AddRef() {
+    DCHECK(thread_id_ == ::GetCurrentThreadId());
+    ref_count_++;
+    return ref_count_;
+  }
+
+  NS_IMETHOD_(nsrefcnt) Release() {
+    DCHECK(thread_id_ == ::GetCurrentThreadId());
+    ref_count_--;
+
+    if (!ref_count_) {
+      T* me = static_cast<T*>(this);
+      delete me;
+      return 0;
+    }
+
+    return ref_count_;
+  }
+
+ protected:
+  nsrefcnt ref_count_;
+  NpEventDelegate* delegate_;
+  AddRefModule module_ref_;
+  // used to DCHECK on expected single-threaded usage
+  unsigned long thread_id_;
+};
+
+// Implements nsIDOMEventListener in order to receive events from DOM
+// elements inside an HTML page.
+class DomEventListener
+  : public nsIDOMEventListener,
+  public NpEventListenerBase<DomEventListener> {
+ public:
+  DomEventListener(NpEventDelegate* delegate);
+  ~DomEventListener();
+
+  // Implementation of NpEventListener
+  virtual bool Subscribe(NPP instance,
+                         const char* event_names[],
+                         int event_name_count);
+  virtual bool Unsubscribe(NPP instance,
+                           const char* event_names[],
+                           int event_name_count);
+ protected:
+  // We implement QueryInterface etc ourselves in order to avoid
+  // extra dependencies brought on by the NS_IMPL_* macros.
+  NS_IMETHOD QueryInterface(REFNSIID iid, void** ptr);
+  NS_IMETHOD_(nsrefcnt) AddRef() {
+    return NpEventListenerBase<DomEventListener>::AddRef();
+  }
+
+  NS_IMETHOD_(nsrefcnt) Release() {
+    return NpEventListenerBase<DomEventListener>::Release();
+  }
+
+  // Implementation of nsIDOMEventListener
+  NS_IMETHOD HandleEvent(nsIDOMEvent *event);
+
+ private:
+  static bool GetObjectElement(NPP instance, nsIDOMElement** element);
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(DomEventListener);
+};
+
+class NPObjectEventListener
+  : public NpEventListenerBase<NPObjectEventListener> {
+ public:
+  NPObjectEventListener(NpEventDelegate* delegate);
+  ~NPObjectEventListener();
+
+  // Implementation of NpEventListener
+  virtual bool Subscribe(NPP instance,
+                         const char* event_names[],
+                         int event_name_count);
+  virtual bool Unsubscribe(NPP instance,
+                           const char* event_names[],
+                           int event_name_count);
+
+ protected:
+  // NPObject structure which is exposed by NPObjectEventListener.
+  class Npo : public NPObject {
+   public:
+    Npo(NPP npp) : npp_(npp), listener_(NULL) {
+    }
+
+    void Initialize(NPObjectEventListener* listener) {
+      listener_ = listener;
+    }
+
+    inline NPObjectEventListener* listener() const {
+      return listener_;
+    }
+
+    inline NPP npp() const {
+      return npp_;
+    }
+
+   protected:
+    NPP npp_;
+    NPObjectEventListener* listener_;
+    AddRefModule module_ref_;
+  };
+
+  static NPClass* PluginClass();
+
+  static bool HasMethod(Npo* npo, NPIdentifier name);
+  static bool Invoke(Npo* npo, NPIdentifier name, const NPVariant* args,
+                     uint32_t arg_count, NPVariant* result);
+  static NPObject* AllocateObject(NPP instance, NPClass* class_name);
+  static void DeallocateObject(Npo* npo);
+
+  typedef enum {
+    HANDLE_EVENT,
+    TYPE,
+    ADD_EVENT_LISTENER,
+    REMOVE_EVENT_LISTENER,
+    TAG_NAME,
+    PARENT_ELEMENT,
+    IDENTIFIER_COUNT,
+  } CachedStringIdentifiers;
+
+  static NPIdentifier* GetCachedStringIds();
+
+  void HandleEvent(Npo* npo, NPObject* event);
+  static NPObject* GetObjectElement(NPP instance);
+
+ private:
+  // Our NPObject.
+  ScopedNpObject<Npo> npo_;
+
+  DISALLOW_COPY_AND_ASSIGN(NPObjectEventListener);
+};
+
+#endif  // CHROME_FRAME_NP_EVENT_LISTENER_H_