75 lines
2.2 KiB
C
75 lines
2.2 KiB
C
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// 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_GTK_H_
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#define BASE_MESSAGE_LOOP_MESSAGE_PUMP_GTK_H_
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#include "base/message_loop/message_pump_glib.h"
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typedef union _GdkEvent GdkEvent;
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typedef struct _XDisplay Display;
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namespace base {
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// The documentation for this class is in message_pump_glib.h
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class MessagePumpObserver {
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public:
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// This method is called before processing a message.
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virtual void WillProcessEvent(GdkEvent* event) = 0;
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// This method is called after processing a message.
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virtual void DidProcessEvent(GdkEvent* event) = 0;
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protected:
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virtual ~MessagePumpObserver() {}
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};
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// The documentation for this class is in message_pump_glib.h
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//
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// The nested loop is exited by either posting a quit, or returning false
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// from Dispatch.
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class MessagePumpDispatcher {
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public:
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// Dispatches the event. If true is returned processing continues as
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// normal. If false is returned, the nested loop exits immediately.
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virtual bool Dispatch(GdkEvent* event) = 0;
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protected:
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virtual ~MessagePumpDispatcher() {}
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};
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// This class implements a message-pump for dispatching GTK events.
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class BASE_EXPORT MessagePumpGtk : public MessagePumpGlib {
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public:
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MessagePumpGtk();
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virtual ~MessagePumpGtk();
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// Dispatch an available GdkEvent. Essentially this allows a subclass to do
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// some task before/after calling the default handler (EventDispatcher).
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void DispatchEvents(GdkEvent* event);
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// Returns default X Display.
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static Display* GetDefaultXDisplay();
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private:
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// Invoked from EventDispatcher. Notifies all observers we're about to
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// process an event.
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void WillProcessEvent(GdkEvent* event);
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// Invoked from EventDispatcher. Notifies all observers we processed an
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// event.
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void DidProcessEvent(GdkEvent* event);
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// Callback prior to gdk dispatching an event.
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static void EventDispatcher(GdkEvent* event, void* data);
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DISALLOW_COPY_AND_ASSIGN(MessagePumpGtk);
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};
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typedef MessagePumpGtk MessagePumpForUI;
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} // namespace base
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#endif // BASE_MESSAGE_LOOP_MESSAGE_PUMP_GTK_H_
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