[WIP] BufferedInputRouter

content/renderer/gpu/renderer_event_packet.h

+// Copyright (c) 2013 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 CONTENT_RENDERER_GPU_RENDERER_EVENT_PACKET_H_
+#define CONTENT_RENDERER_GPU_RENDERER_EVENT_PACKET_H_
+
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/scoped_vector.h"
+#include "content/common/content_export.h"
+#include "content/common/input/input_event_disposition.h"
+#include "ipc/ipc_message.h"
+
+namespace ui {
+struct LatencyInfo;
+}
+
+namespace WebKit {
+class WebInputEvent;
+}
+
+namespace content {
+
+class EventPacket;
+
+// Utility wrapper class for handling EventPacket dispatch in the renderer.
+class RendererEventPacket {
+ public:
+  // |packet| is assumed to outlive the constructed RendererEventPacket.
+  RendererEventPacket(const EventPacket* packet,
+                      const InputEventDispositions& dispositions);
+  ~RendererEventPacket();
+
+  // Provides dispatch of individual |InputEvent| payloads.
+  class Dispatcher {
+   public:
+    virtual ~Dispatcher() {}
+    virtual InputEventDisposition Dispatch(const IPC::Message& message) = 0;
+    virtual InputEventDisposition Dispatch(int routing_id,
+                                           const WebKit::WebInputEvent* event,
+                                           const ui::LatencyInfo& latency_info,
+                                           bool is_keyboard_shortcut) = 0;
+  };
+
+  enum DispatchThreadType {
+    THREAD_MAIN,
+    THREAD_IMPL
+  };
+
+  // Attempts to dispatch all unprocessed events to |dispatcher| until an
+  // unhandled event prevents further dispatch (e.g., touch event).
+  // Returns the appropriate message for the result, either
+  //    * |InputHostMsg_HandleEventPacket_ACK| if dispatch is complete, or
+  //    * |InputMsg_HandleEventPacket| if the packet needs forwarding.
+ scoped_ptr<IPC::Message> DispatchWith(Dispatcher* dispatcher,
+                                       DispatchThreadType thread_type,
+                                       int routing_id);
+
+ private:
+  const EventPacket* packet_;
+  InputEventDispositions dispositions_;
+
+  DISALLOW_COPY_AND_ASSIGN(RendererEventPacket);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_GPU_RENDERER_EVENT_PACKET_H_