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Side by Side Diff: trunk/src/base/message_loop/message_pump_dispatcher.h

Issue 16897005: Revert 206507 "Move message_pump to base/message_loop." (Closed) Base URL: svn://svn.chromium.org/chrome/
Patch Set: Created 7 years, 6 months ago
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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
3 // found in the LICENSE file.
4
5 #ifndef BASE_MESSAGE_LOOP_MESSAGE_PUMP_DISPATCHER_H
6 #define BASE_MESSAGE_LOOP_MESSAGE_PUMP_DISPATCHER_H
7
8 #include "base/base_export.h"
9 #include "base/event_types.h"
10
11 namespace base {
12
13 // Dispatcher is used during a nested invocation of Run to dispatch events when
14 // |RunLoop(dispatcher).Run()| is used. If |RunLoop().Run()| is invoked,
15 // MessageLoop does not dispatch events (or invoke TranslateMessage), rather
16 // every message is passed to Dispatcher's Dispatch method for dispatch. It is
17 // up to the Dispatcher whether or not to dispatch the event.
18 //
19 // The nested loop is exited by either posting a quit, or returning false
20 // from Dispatch.
21 class BASE_EXPORT MessagePumpDispatcher {
22 public:
23 virtual ~MessagePumpDispatcher() {}
24
25 // Dispatches the event. If true is returned processing continues as
26 // normal. If false is returned, the nested loop exits immediately.
27 virtual bool Dispatch(const NativeEvent& event) = 0;
28 };
29
30 } // namespace base
31
32 #endif // BASE_MESSAGE_LOOP_MESSAGE_PUMP_DISPATCHER_H
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