Browser Plugin: New Implementation (Renderer Side)

content/renderer/browser_plugin/browser_plugin_bindings.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 WEBKIT_PLUGINS_PPAPI_MESSAGE_CHANNEL_H_
+#define WEBKIT_PLUGINS_PPAPI_MESSAGE_CHANNEL_H_
+
+#include "base/memory/weak_ptr.h"
+#include "ppapi/shared_impl/resource.h"
+#include "third_party/npapi/bindings/npruntime.h"
+
+namespace WebKit {
+class WebSerializedScriptValue;
+}
+
+namespace content {
+namespace browser_plugin {
+
+class BrowserPlugin;
+
+class BrowserPluginBindings {
+ public:
+  // BrowserPluginNPObject is a simple struct that adds a pointer back to a
+  // BrowserPluginBindings instance.  This way, we can use an NPObject to allow
+  // JavaScript interactions without forcing BrowserPluginBindings to inherit
+  // from NPObject.
+  struct BrowserPluginNPObject : public NPObject {
+    BrowserPluginNPObject();
+    ~BrowserPluginNPObject();
+
+    base::WeakPtr<BrowserPluginBindings> message_channel;
+  };
+
+  explicit BrowserPluginBindings(BrowserPlugin* instance);
+  ~BrowserPluginBindings();
+
+  NPObject* np_object() const { return np_object_; }
+
+  BrowserPlugin* instance() const { return instance_; }
+ private:
+  BrowserPlugin* instance_;
+  // The NPObject we use to expose postMessage to JavaScript.
+  BrowserPluginNPObject* np_object_;
+
+  // This is used to ensure pending tasks will not fire after this object is
+  // destroyed.
+  base::WeakPtrFactory<BrowserPluginBindings> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(BrowserPluginBindings);
+};
+
+}  // namespace browser_plugin
+}  // namespace content
+
+#endif  // WEBKIT_PLUGINS_PPAPI_MESSAGE_CHANNEL_H_