48 lines
1.6 KiB
C++
48 lines
1.6 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_MESSAGE_LOOP_MESSAGE_PUMP_OBSERVER_H
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#define BASE_MESSAGE_LOOP_MESSAGE_PUMP_OBSERVER_H
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#include "base/base_export.h"
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#include "base/event_types.h"
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namespace base {
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enum EventStatus {
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EVENT_CONTINUE, // The event should be dispatched as normal.
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#if defined(USE_X11)
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EVENT_HANDLED // The event should not be processed any farther.
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#endif
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};
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// A MessagePumpObserver is an object that receives global
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// notifications from the UI MessageLoop with MessagePumpWin or
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// MessagePumpAuraX11.
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//
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// NOTE: An Observer implementation should be extremely fast!
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//
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// For use with MessagePumpAuraX11, please see message_pump_glib.h for more
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// info about how this is invoked in this environment.
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class BASE_EXPORT MessagePumpObserver {
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public:
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// This method is called before processing a NativeEvent. If the
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// method returns EVENT_HANDLED, it indicates the event has already
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// been handled, so the event is not processed any farther. If the
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// method returns EVENT_CONTINUE, the event dispatching proceeds as
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// normal.
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virtual EventStatus WillProcessEvent(const NativeEvent& event) = 0;
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// This method is called after processing a message. This method
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// will not be called if WillProcessEvent returns EVENT_HANDLED.
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virtual void DidProcessEvent(const NativeEvent& event) = 0;
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protected:
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virtual ~MessagePumpObserver() {}
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};
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} // namespace base
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#endif // BASE_MESSAGE_LOOP_MESSAGE_PUMP_OBSERVER_H
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