155 lines
4.3 KiB
C++
155 lines
4.3 KiB
C++
/*
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* barrier -- mouse and keyboard sharing utility
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* Copyright (C) 2012-2016 Symless Ltd.
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* Copyright (C) 2004 Chris Schoeneman
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*
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* This package is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* found in the file LICENSE that should have accompanied this file.
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*
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* This package is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "platform/MSWindowsEventQueueBuffer.h"
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#include "arch/win32/ArchMiscWindows.h"
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#include "mt/Thread.h"
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#include "base/IEventQueue.h"
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#include <VersionHelpers.h>
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//
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// EventQueueTimer
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//
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class EventQueueTimer { };
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//
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// MSWindowsEventQueueBuffer
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//
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MSWindowsEventQueueBuffer::MSWindowsEventQueueBuffer(IEventQueue* events) :
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m_events(events)
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{
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// remember thread. we'll be posting messages to it.
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m_thread = GetCurrentThreadId();
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// create a message type for custom events
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m_userEvent = RegisterWindowMessage("BARRIER_USER_EVENT");
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// get message type for daemon quit
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m_daemonQuit = ArchMiscWindows::getDaemonQuitMessage();
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// make sure this thread has a message queue
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MSG dummy;
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PeekMessage(&dummy, NULL, WM_USER, WM_USER, PM_NOREMOVE);
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m_os_supported_message_types = QS_ALLINPUT;
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if (!IsWindows8OrGreater())
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{
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// don't use QS_POINTER, QS_TOUCH
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// because they can cause GetQueueStatus() to always return 0 and we miss events
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// since those flags are confusing Windows 7. See QTBUG-29097 for related info
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m_os_supported_message_types &= ~(QS_TOUCH | QS_POINTER);
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}
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}
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MSWindowsEventQueueBuffer::~MSWindowsEventQueueBuffer()
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{
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// do nothing
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}
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void
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MSWindowsEventQueueBuffer::waitForEvent(double timeout)
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{
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// check if messages are available first. if we don't do this then
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// MsgWaitForMultipleObjects() will block even if the queue isn't
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// empty if the messages in the queue were there before the last
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// call to GetMessage()/PeekMessage().
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if (!isEmpty()) {
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return;
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}
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// convert timeout
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DWORD t;
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if (timeout < 0.0) {
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t = INFINITE;
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}
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else {
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t = (DWORD)(1000.0 * timeout);
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}
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// wait for a message. we cannot be interrupted by thread
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// cancellation but that's okay because we're run in the main
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// thread and we never cancel that thread.
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HANDLE dummy[1];
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MsgWaitForMultipleObjects(0, dummy, FALSE, t, m_os_supported_message_types);
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}
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IEventQueueBuffer::Type
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MSWindowsEventQueueBuffer::getEvent(Event& event, UInt32& dataID)
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{
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// peek at messages first. waiting for QS_ALLINPUT will return
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// if a message has been sent to our window but GetMessage will
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// dispatch that message behind our backs and block. PeekMessage
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// will also dispatch behind our backs but won't block.
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if (!PeekMessage(&m_event, NULL, 0, 0, PM_NOREMOVE) &&
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!PeekMessage(&m_event, (HWND)-1, 0, 0, PM_NOREMOVE)) {
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return kNone;
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}
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// BOOL. yeah, right.
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BOOL result = GetMessage(&m_event, NULL, 0, 0);
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if (result == -1) {
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return kNone;
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}
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else if (result == 0) {
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event = Event(Event::kQuit);
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return kSystem;
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}
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else if (m_daemonQuit != 0 && m_event.message == m_daemonQuit) {
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event = Event(Event::kQuit);
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return kSystem;
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}
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else if (m_event.message == m_userEvent) {
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dataID = static_cast<UInt32>(m_event.wParam);
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return kUser;
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}
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else {
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event = Event(Event::kSystem,
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m_events->getSystemTarget(), &m_event);
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return kSystem;
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}
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}
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bool
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MSWindowsEventQueueBuffer::addEvent(UInt32 dataID)
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{
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return (PostThreadMessage(m_thread, m_userEvent,
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static_cast<WPARAM>(dataID), 0) != 0);
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}
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bool
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MSWindowsEventQueueBuffer::isEmpty() const
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{
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return (HIWORD(GetQueueStatus(m_os_supported_message_types)) == 0);
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}
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EventQueueTimer*
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MSWindowsEventQueueBuffer::newTimer(double, bool) const
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{
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return new EventQueueTimer;
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}
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void
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MSWindowsEventQueueBuffer::deleteTimer(EventQueueTimer* timer) const
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{
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delete timer;
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}
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