barrier/lib/platform/COSXEventQueueBuffer.cpp

/*
 * synergy -- mouse and keyboard sharing utility
 * Copyright (C) 2004 Chris Schoeneman
 * 
 * This package is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * found in the file COPYING that should have accompanied this file.
 * 
 * This package is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include "COSXEventQueueBuffer.h"
#include "CEvent.h"
#include "IEventQueue.h"

//
// CEventQueueTimer
//

class CEventQueueTimer { };

//
// COSXEventQueueBuffer
//

COSXEventQueueBuffer::COSXEventQueueBuffer() :
	m_event(NULL)
{
	// do nothing
}

COSXEventQueueBuffer::~COSXEventQueueBuffer()
{
	setOSXEvent(NULL);
}

void
COSXEventQueueBuffer::waitForEvent(double timeout)
{
	EventRef event;
	ReceiveNextEvent(0, NULL, timeout, false, &event);
}

IEventQueueBuffer::Type
COSXEventQueueBuffer::getEvent(CEvent& event, UInt32& dataID)
{
	EventRef carbonEvent = NULL;
	OSStatus error = ReceiveNextEvent(0, NULL, 0.0, true, &carbonEvent);
	setOSXEvent(carbonEvent);

	if (error == eventLoopQuitErr) {
		event = CEvent(CEvent::kQuit);
		return kSystem;
	}
	else if (error != noErr) {
		return kNone;
	}
	else {
		UInt32 eventClass = GetEventClass(m_event);
		switch (eventClass) {
		case 'Syne': 
			dataID = GetEventKind(m_event);
			return kUser;

		default: 
			event = CEvent(CEvent::kSystem,
						IEventQueue::getSystemTarget(), &m_event);
			return kNone;
		}
	}
}

bool
COSXEventQueueBuffer::addEvent(UInt32 dataID)
{
	EventRef event;
	OSStatus error = CreateEvent( 
							kCFAllocatorDefault,
							'Syne', 
							dataID,
							0,
							kEventAttributeNone,
							&event);

	if (error == noErr) {
		error = PostEventToQueue(GetMainEventQueue(), event, 
							kEventPriorityStandard);
		ReleaseEvent(event);
	}
	
	return (error == noErr);
}

bool
COSXEventQueueBuffer::isEmpty() const
{
	EventRef event;
	OSStatus status = ReceiveNextEvent(0, NULL, 0.0, false, &event);
	return (status == eventLoopTimedOutErr);
}

CEventQueueTimer*
COSXEventQueueBuffer::newTimer(double, bool) const
{
	return new CEventQueueTimer;
}

void
COSXEventQueueBuffer::deleteTimer(CEventQueueTimer* timer) const
{
	delete timer;
}

void 
COSXEventQueueBuffer::setOSXEvent(EventRef event)
{
	if (m_event != NULL) {
		ReleaseEvent(m_event);
	}
	m_event = RetainEvent(event);
}