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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef BASE_MESSAGE_PUMP_WIN_H_ | 5 #ifndef BASE_MESSAGE_PUMP_WIN_H_ |
6 #define BASE_MESSAGE_PUMP_WIN_H_ | 6 #define BASE_MESSAGE_PUMP_WIN_H_ |
7 #pragma once | 7 #pragma once |
8 | 8 |
9 #include <windows.h> | 9 #include <windows.h> |
10 | 10 |
11 #include <list> | 11 #include <list> |
12 | 12 |
13 #include "base/base_export.h" | 13 #include "base/base_export.h" |
14 #include "base/basictypes.h" | 14 #include "base/basictypes.h" |
15 #include "base/message_pump.h" | 15 #include "base/message_pump.h" |
| 16 #include "base/message_pump_dispatcher.h" |
16 #include "base/message_pump_observer.h" | 17 #include "base/message_pump_observer.h" |
17 #include "base/observer_list.h" | 18 #include "base/observer_list.h" |
18 #include "base/time.h" | 19 #include "base/time.h" |
19 #include "base/win/scoped_handle.h" | 20 #include "base/win/scoped_handle.h" |
20 | 21 |
21 namespace base { | 22 namespace base { |
22 | 23 |
23 // MessagePumpWin serves as the base for specialized versions of the MessagePump | 24 // MessagePumpWin serves as the base for specialized versions of the MessagePump |
24 // for Windows. It provides basic functionality like handling of observers and | 25 // for Windows. It provides basic functionality like handling of observers and |
25 // controlling the lifetime of the message pump. | 26 // controlling the lifetime of the message pump. |
26 class BASE_EXPORT MessagePumpWin : public MessagePump { | 27 class BASE_EXPORT MessagePumpWin : public MessagePump { |
27 public: | 28 public: |
28 | |
29 // Dispatcher is used during a nested invocation of Run to dispatch events. | |
30 // If Run is invoked with a non-NULL Dispatcher, MessageLoop does not | |
31 // dispatch events (or invoke TranslateMessage), rather every message is | |
32 // passed to Dispatcher's Dispatch method for dispatch. It is up to the | |
33 // Dispatcher to dispatch, or not, the event. | |
34 // | |
35 // The nested loop is exited by either posting a quit, or returning false | |
36 // from Dispatch. | |
37 class BASE_EXPORT Dispatcher { | |
38 public: | |
39 virtual ~Dispatcher() {} | |
40 // Dispatches the event. If true is returned processing continues as | |
41 // normal. If false is returned, the nested loop exits immediately. | |
42 virtual bool Dispatch(const MSG& msg) = 0; | |
43 }; | |
44 | |
45 MessagePumpWin() : have_work_(0), state_(NULL) {} | 29 MessagePumpWin() : have_work_(0), state_(NULL) {} |
46 virtual ~MessagePumpWin() {} | 30 virtual ~MessagePumpWin() {} |
47 | 31 |
48 // Add an Observer, which will start receiving notifications immediately. | 32 // Add an Observer, which will start receiving notifications immediately. |
49 void AddObserver(MessagePumpObserver* observer); | 33 void AddObserver(MessagePumpObserver* observer); |
50 | 34 |
51 // Remove an Observer. It is safe to call this method while an Observer is | 35 // Remove an Observer. It is safe to call this method while an Observer is |
52 // receiving a notification callback. | 36 // receiving a notification callback. |
53 void RemoveObserver(MessagePumpObserver* observer); | 37 void RemoveObserver(MessagePumpObserver* observer); |
54 | 38 |
55 // Give a chance to code processing additional messages to notify the | 39 // Give a chance to code processing additional messages to notify the |
56 // message loop observers that another message has been processed. | 40 // message loop observers that another message has been processed. |
57 void WillProcessMessage(const MSG& msg); | 41 void WillProcessMessage(const MSG& msg); |
58 void DidProcessMessage(const MSG& msg); | 42 void DidProcessMessage(const MSG& msg); |
59 | 43 |
60 // Like MessagePump::Run, but MSG objects are routed through dispatcher. | 44 // Like MessagePump::Run, but MSG objects are routed through dispatcher. |
61 void RunWithDispatcher(Delegate* delegate, Dispatcher* dispatcher); | 45 void RunWithDispatcher(Delegate* delegate, MessagePumpDispatcher* dispatcher); |
62 | 46 |
63 // MessagePump methods: | 47 // MessagePump methods: |
64 virtual void Run(Delegate* delegate) { RunWithDispatcher(delegate, NULL); } | 48 virtual void Run(Delegate* delegate) { RunWithDispatcher(delegate, NULL); } |
65 virtual void Quit(); | 49 virtual void Quit(); |
66 | 50 |
67 protected: | 51 protected: |
68 struct RunState { | 52 struct RunState { |
69 Delegate* delegate; | 53 Delegate* delegate; |
70 Dispatcher* dispatcher; | 54 MessagePumpDispatcher* dispatcher; |
71 | 55 |
72 // Used to flag that the current Run() invocation should return ASAP. | 56 // Used to flag that the current Run() invocation should return ASAP. |
73 bool should_quit; | 57 bool should_quit; |
74 | 58 |
75 // Used to count how many Run() invocations are on the stack. | 59 // Used to count how many Run() invocations are on the stack. |
76 int run_depth; | 60 int run_depth; |
77 }; | 61 }; |
78 | 62 |
79 virtual void DoRunLoop() = 0; | 63 virtual void DoRunLoop() = 0; |
80 int GetCurrentDelay() const; | 64 int GetCurrentDelay() const; |
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345 // This list will be empty almost always. It stores IO completions that have | 329 // This list will be empty almost always. It stores IO completions that have |
346 // not been delivered yet because somebody was doing cleanup. | 330 // not been delivered yet because somebody was doing cleanup. |
347 std::list<IOItem> completed_io_; | 331 std::list<IOItem> completed_io_; |
348 | 332 |
349 ObserverList<IOObserver> io_observers_; | 333 ObserverList<IOObserver> io_observers_; |
350 }; | 334 }; |
351 | 335 |
352 } // namespace base | 336 } // namespace base |
353 | 337 |
354 #endif // BASE_MESSAGE_PUMP_WIN_H_ | 338 #endif // BASE_MESSAGE_PUMP_WIN_H_ |
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