1 // Copyright 2013 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #ifndef CONTENT_RENDERER_INPUT_INPUT_EVENT_FILTER_H_
6 #define CONTENT_RENDERER_INPUT_INPUT_EVENT_FILTER_H_
11 #include "base/callback_forward.h"
12 #include "base/synchronization/lock.h"
13 #include "content/common/content_export.h"
14 #include "content/common/input/input_event_ack_state.h"
15 #include "content/renderer/input/input_handler_manager_client.h"
16 #include "ipc/message_filter.h"
17 #include "third_party/WebKit/public/web/WebInputEvent.h"
20 class MessageLoopProxy;
28 // This class can be used to intercept InputMsg_HandleInputEvent messages
29 // and have them be delivered to a target thread. Input events are filtered
30 // based on routing_id (see AddRoute and RemoveRoute).
32 // The user of this class provides an instance of InputEventFilter::Handler,
33 // which will be passed WebInputEvents on the target thread.
38 class CONTENT_EXPORT InputEventFilter : public InputHandlerManagerClient,
39 public IPC::MessageFilter {
41 InputEventFilter(IPC::Listener* main_listener,
42 const scoped_refptr<base::MessageLoopProxy>& target_loop);
44 // The |handler| is invoked on the thread associated with |target_loop| to
45 // handle input events matching the filtered routes.
47 // If INPUT_EVENT_ACK_STATE_NOT_CONSUMED is returned by the handler,
48 // the original InputMsg_HandleInputEvent message will be delivered to
49 // |main_listener| on the main thread. (The "main thread" in this context is
50 // the thread where the InputEventFilter was constructed.) The responsibility
51 // is left to the eventual handler to deliver the corresponding
52 // InputHostMsg_HandleInputEvent_ACK.
54 virtual void SetBoundHandler(const Handler& handler) OVERRIDE;
55 virtual void DidAddInputHandler(int routing_id,
56 cc::InputHandler* input_handler) OVERRIDE;
57 virtual void DidRemoveInputHandler(int routing_id) OVERRIDE;
58 virtual void DidOverscroll(int routing_id,
59 const DidOverscrollParams& params) OVERRIDE;
60 virtual void DidStopFlinging(int routing_id) OVERRIDE;
62 // IPC::MessageFilter methods:
63 virtual void OnFilterAdded(IPC::Channel* channel) OVERRIDE;
64 virtual void OnFilterRemoved() OVERRIDE;
65 virtual void OnChannelClosing() OVERRIDE;
66 virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
69 virtual ~InputEventFilter();
71 void ForwardToMainListener(const IPC::Message& message);
72 void ForwardToHandler(const IPC::Message& message);
73 void SendACK(blink::WebInputEvent::Type type,
74 InputEventAckState ack_result,
75 const ui::LatencyInfo& latency_info,
77 void SendMessage(const IPC::Message& message);
78 void SendMessageOnIOThread(const IPC::Message& message);
80 scoped_refptr<base::MessageLoopProxy> main_loop_;
81 IPC::Listener* main_listener_;
83 // The sender_ only gets invoked on the thread corresponding to io_loop_.
84 scoped_refptr<base::MessageLoopProxy> io_loop_;
87 // The handler_ only gets Run on the thread corresponding to target_loop_.
88 scoped_refptr<base::MessageLoopProxy> target_loop_;
91 // Protects access to routes_.
92 base::Lock routes_lock_;
94 // Indicates the routing_ids for which input events should be filtered.
95 std::set<int> routes_;
97 // Specifies whether overscroll notifications are forwarded to the host.
98 bool overscroll_notifications_enabled_;
101 } // namespace content
103 #endif // CONTENT_RENDERER_INPUT_INPUT_EVENT_FILTER_H_