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Side by Side Diff: trunk/src/base/message_loop/message_pump_observer.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_OBSERVER_H
6 #define BASE_MESSAGE_LOOP_MESSAGE_PUMP_OBSERVER_H
7
8 #include "base/base_export.h"
9 #include "base/event_types.h"
10
11 namespace base {
12
13 enum EventStatus {
14 EVENT_CONTINUE, // The event should be dispatched as normal.
15 #if defined(USE_X11)
16 EVENT_HANDLED // The event should not be processed any farther.
17 #endif
18 };
19
20 // A MessagePumpObserver is an object that receives global
21 // notifications from the UI MessageLoop with MessagePumpWin or
22 // MessagePumpAuraX11.
23 //
24 // NOTE: An Observer implementation should be extremely fast!
25 //
26 // For use with MessagePumpAuraX11, please see message_pump_glib.h for more
27 // info about how this is invoked in this environment.
28 class BASE_EXPORT MessagePumpObserver {
29 public:
30 // This method is called before processing a NativeEvent. If the
31 // method returns EVENT_HANDLED, it indicates the event has already
32 // been handled, so the event is not processed any farther. If the
33 // method returns EVENT_CONTINUE, the event dispatching proceeds as
34 // normal.
35 virtual EventStatus WillProcessEvent(const NativeEvent& event) = 0;
36
37 // This method is called after processing a message. This method
38 // will not be called if WillProcessEvent returns EVENT_HANDLED.
39 virtual void DidProcessEvent(const NativeEvent& event) = 0;
40
41 protected:
42 virtual ~MessagePumpObserver() {}
43 };
44
45 } // namespace base
46
47 #endif // BASE_MESSAGE_LOOP_MESSAGE_PUMP_OBSERVER_H
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