244 lines
7.4 KiB
C++
244 lines
7.4 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
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** Contact: http://www.qt-project.org/legal
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**
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** This file is part of the QtCore module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and Digia. For licensing terms and
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** conditions see http://qt.digia.com/licensing. For further information
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** use the contact form at http://qt.digia.com/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Digia gives you certain additional
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** rights. These rights are described in the Digia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3.0 as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU General Public License version 3.0 requirements will be
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** met: http://www.gnu.org/copyleft/gpl.html.
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "qwineventnotifier.h"
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#include "qeventdispatcher_win_p.h"
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#include "qcoreapplication.h"
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#include <private/qthread_p.h>
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QT_BEGIN_NAMESPACE
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class QWinEventNotifierPrivate : public QObjectPrivate
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{
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Q_DECLARE_PUBLIC(QWinEventNotifier)
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public:
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QWinEventNotifierPrivate()
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: handleToEvent(0), enabled(false) {}
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QWinEventNotifierPrivate(HANDLE h, bool e)
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: handleToEvent(h), enabled(e) {}
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HANDLE handleToEvent;
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bool enabled;
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};
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/*!
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\class QWinEventNotifier
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\inmodule QtCore
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\since 5.0
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\brief The QWinEventNotifier class provides support for the Windows Wait functions.
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The QWinEventNotifier class makes it possible to use the wait
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functions on windows in a asynchronous manner. With this class,
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you can register a HANDLE to an event and get notification when
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that event becomes signalled. The state of the event is not modified
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in the process so if it is a manual reset event you will need to
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reset it after the notification.
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Once you have created a event object using Windows API such as
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CreateEvent() or OpenEvent(), you can create an event notifier to
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monitor the event handle. If the event notifier is enabled, it will
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emit the activated() signal whenever the corresponding event object
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is signalled.
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The setEnabled() function allows you to disable as well as enable the
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event notifier. It is generally advisable to explicitly enable or
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disable the event notifier. A disabled notifier does nothing when the
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event object is signalled (the same effect as not creating the
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event notifier). Use the isEnabled() function to determine the
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notifier's current status.
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Finally, you can use the setHandle() function to register a new event
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object, and the handle() function to retrieve the event handle.
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\b{Further information:}
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Although the class is called QWinEventNotifier, it can be used for
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certain other objects which are so-called synchronization
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objects, such as Processes, Threads, Waitable timers.
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\warning This class is only available on Windows.
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*/
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/*!
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\fn void QWinEventNotifier::activated(HANDLE hEvent)
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This signal is emitted whenever the event notifier is enabled and
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the corresponding HANDLE is signalled.
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The state of the event is not modified in the process, so if it is a
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manual reset event, you will need to reset it after the notification.
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The object is passed in the \a hEvent parameter.
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\sa handle()
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*/
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/*!
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Constructs an event notifier with the given \a parent.
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*/
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QWinEventNotifier::QWinEventNotifier(QObject *parent)
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: QObject(*new QWinEventNotifierPrivate, parent)
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{}
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/*!
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Constructs an event notifier with the given \a parent. It enables
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the notifier, and watches for the event \a hEvent.
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The notifier is enabled by default, i.e. it emits the activated() signal
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whenever the corresponding event is signalled. However, it is generally
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advisable to explicitly enable or disable the event notifier.
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\sa setEnabled(), isEnabled()
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*/
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QWinEventNotifier::QWinEventNotifier(HANDLE hEvent, QObject *parent)
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: QObject(*new QWinEventNotifierPrivate(hEvent, false), parent)
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{
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Q_D(QWinEventNotifier);
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QAbstractEventDispatcher *eventDispatcher = d->threadData->eventDispatcher.load();
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if (!eventDispatcher) {
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qWarning("QWinEventNotifier: Can only be used with threads started with QThread");
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} else {
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eventDispatcher->registerEventNotifier(this);
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}
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d->enabled = true;
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}
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/*!
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Destroys this notifier.
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*/
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QWinEventNotifier::~QWinEventNotifier()
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{
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setEnabled(false);
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}
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/*!
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Register the HANDLE \a hEvent. The old HANDLE will be automatically
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unregistered.
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\b Note: The notifier will be disabled as a side effect and needs
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to be re-enabled.
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\sa handle(), setEnabled()
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*/
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void QWinEventNotifier::setHandle(HANDLE hEvent)
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{
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Q_D(QWinEventNotifier);
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setEnabled(false);
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d->handleToEvent = hEvent;
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}
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/*!
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Returns the HANDLE that has been registered in the notifier.
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\sa setHandle()
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*/
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HANDLE QWinEventNotifier::handle() const
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{
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Q_D(const QWinEventNotifier);
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return d->handleToEvent;
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}
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/*!
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Returns true if the notifier is enabled; otherwise returns false.
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\sa setEnabled()
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*/
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bool QWinEventNotifier::isEnabled() const
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{
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Q_D(const QWinEventNotifier);
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return d->enabled;
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}
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/*!
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If \a enable is true, the notifier is enabled; otherwise the notifier
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is disabled.
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\sa isEnabled(), activated()
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*/
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void QWinEventNotifier::setEnabled(bool enable)
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{
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Q_D(QWinEventNotifier);
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if (d->enabled == enable) // no change
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return;
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d->enabled = enable;
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QAbstractEventDispatcher *eventDispatcher = d->threadData->eventDispatcher.load();
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if (!eventDispatcher) // perhaps application is shutting down
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return;
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if (enable)
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eventDispatcher->registerEventNotifier(this);
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else
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eventDispatcher->unregisterEventNotifier(this);
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}
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/*!
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\reimp
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*/
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bool QWinEventNotifier::event(QEvent * e)
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{
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Q_D(QWinEventNotifier);
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if (e->type() == QEvent::ThreadChange) {
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if (d->enabled) {
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QMetaObject::invokeMethod(this, "setEnabled", Qt::QueuedConnection,
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Q_ARG(bool, true));
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setEnabled(false);
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}
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}
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QObject::event(e); // will activate filters
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if (e->type() == QEvent::WinEventAct) {
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emit activated(d->handleToEvent, QPrivateSignal());
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return true;
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}
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return false;
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}
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QT_END_NAMESPACE
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