1// Copyright (C) 2016 The Qt Company Ltd.
2// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
3
4#ifndef QTIMERINFO_UNIX_P_H
5#define QTIMERINFO_UNIX_P_H
6
7//
8// W A R N I N G
9// -------------
10//
11// This file is not part of the Qt API. It exists purely as an
12// implementation detail. This header file may change from version to
13// version without notice, or even be removed.
14//
15// We mean it.
16//
17
18#include <QtCore/private/qglobal_p.h>
19
20#include "qabstracteventdispatcher.h"
21
22#include <sys/time.h> // struct timespec
23#include <chrono>
24
25QT_BEGIN_NAMESPACE
26
27// internal timer info
28struct QTimerInfo
29{
30 using Duration = QAbstractEventDispatcher::Duration;
31 using TimePoint = std::chrono::time_point<std::chrono::steady_clock, Duration>;
32 QTimerInfo(Qt::TimerId timerId, Duration interval, Qt::TimerType type, QObject *obj)
33 : interval(interval), id(timerId), timerType(type), obj(obj)
34 {
35 }
36
37 TimePoint timeout = {}; // - when to actually fire
38 Duration interval = Duration{-1}; // - timer interval
39 Qt::TimerId id = Qt::TimerId::Invalid; // - timer identifier
40 Qt::TimerType timerType; // - timer type
41 QObject *obj = nullptr; // - object to receive event
42 QTimerInfo **activateRef = nullptr; // - ref from activateTimers
43};
44
45class Q_CORE_EXPORT QTimerInfoList
46{
47public:
48 using Duration = QAbstractEventDispatcher::Duration;
49 using TimerInfo = QAbstractEventDispatcher::TimerInfoV2;
50 QTimerInfoList();
51
52 mutable std::chrono::steady_clock::time_point currentTime;
53
54 std::optional<Duration> timerWait();
55 void timerInsert(QTimerInfo *);
56
57 Duration remainingDuration(Qt::TimerId timerId) const;
58
59 void registerTimer(Qt::TimerId timerId, Duration interval,
60 Qt::TimerType timerType, QObject *object);
61 bool unregisterTimer(Qt::TimerId timerId);
62 bool unregisterTimers(QObject *object);
63 QList<TimerInfo> registeredTimers(QObject *object) const;
64
65 int activateTimers();
66 bool hasPendingTimers();
67
68 void clearTimers()
69 {
70 qDeleteAll(c: timers);
71 timers.clear();
72 }
73
74 bool isEmpty() const { return timers.empty(); }
75
76 qsizetype size() const { return timers.size(); }
77
78 auto findTimerById(Qt::TimerId timerId) const
79 {
80 auto matchesId = [timerId](const auto &t) { return t->id == timerId; };
81 return std::find_if(first: timers.cbegin(), last: timers.cend(), pred: matchesId);
82 }
83
84private:
85 std::chrono::steady_clock::time_point updateCurrentTime() const;
86
87 // state variables used by activateTimers()
88 QTimerInfo *firstTimerInfo = nullptr;
89 QList<QTimerInfo *> timers;
90};
91
92QT_END_NAMESPACE
93
94#endif // QTIMERINFO_UNIX_P_H
95

source code of qtbase/src/corelib/kernel/qtimerinfo_unix_p.h