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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QSIGNALSPY_H
#define QSIGNALSPY_H
#include <QtCore/qbytearray.h>
#include <QtCore/qlist.h>
#include <QtCore/qobject.h>
#include <QtCore/qmetaobject.h>
#include <QtTest/qtesteventloop.h>
#include <QtCore/qvariant.h>
#include <QtCore/qmutex.h>
QT_BEGIN_NAMESPACE
class QVariant;
class QSignalSpy: public QObject, public QList<QList<QVariant> >
{
struct ObjectSignal {
const QObject *obj;
QMetaMethod sig;
};
public:
explicit QSignalSpy(const QObject *obj, const char *aSignal)
: QSignalSpy(verify(obj, aSignal)) {}
private:
static ObjectSignal verify(const QObject *obj, const char *aSignal)
{
if (!isObjectValid(obj))
return {};
if (!aSignal) {
qWarning("QSignalSpy: Null signal name is not valid");
return {};
}
if (((aSignal[0] - '0') & 0x03) != QSIGNAL_CODE) {
qWarning("QSignalSpy: Not a valid signal, use the SIGNAL macro");
return {};
}
const QByteArray ba = QMetaObject::normalizedSignature(aSignal + 1);
const QMetaObject * const mo = obj->metaObject();
const int sigIndex = mo->indexOfMethod(ba.constData());
if (sigIndex < 0) {
qWarning("QSignalSpy: No such signal: '%s'", ba.constData());
return {};
}
return verify(obj, mo->method(sigIndex));
}
public:
#ifdef Q_QDOC
template <typename PointerToMemberFunction>
QSignalSpy(const QObject *object, PointerToMemberFunction signal);
#else
template <typename Func>
QSignalSpy(const typename QtPrivate::FunctionPointer<Func>::Object *obj, Func signal0)
: QSignalSpy(verify(obj, QMetaMethod::fromSignal(signal0))) {}
#endif // Q_QDOC
QSignalSpy(const QObject *obj, QMetaMethod signal)
: QSignalSpy(verify(obj, signal)) {}
private:
static ObjectSignal verify(const QObject *obj, QMetaMethod signal)
{
if (isObjectValid(obj) && isSignalMetaMethodValid(signal))
return {obj, signal};
else
return {};
}
public:
inline bool isValid() const { return !sig.isEmpty(); }
inline QByteArray signal() const { return sig; }
bool wait(int timeout)
{ return wait(std::chrono::milliseconds{timeout}); }
bool wait(std::chrono::milliseconds timeout = std::chrono::seconds{5})
{
QMutexLocker locker(&m_mutex);
Q_ASSERT(!m_waiting);
const qsizetype origCount = size();
m_waiting = true;
locker.unlock();
m_loop.enterLoop(timeout);
locker.relock();
m_waiting = false;
return size() > origCount;
}
int qt_metacall(QMetaObject::Call call, int methodId, void **a) override
{
methodId = QObject::qt_metacall(call, methodId, a);
if (methodId < 0)
return methodId;
if (call == QMetaObject::InvokeMetaMethod) {
if (methodId == 0) {
appendArgs(a);
}
--methodId;
}
return methodId;
}
private:
explicit QSignalSpy(ObjectSignal os)
{
if (!os.obj)
return;
initArgs(os.sig, os.obj);
if (!connectToSignal(os.obj, os.sig.methodIndex()))
return;
sig = os.sig.methodSignature();
}
bool connectToSignal(const QObject *sender, int sigIndex)
{
static const int memberOffset = QObject::staticMetaObject.methodCount();
const bool connected = QMetaObject::connect(
sender, sigIndex, this, memberOffset, Qt::DirectConnection, nullptr);
if (!connected)
qWarning("QSignalSpy: QMetaObject::connect returned false. Unable to connect.");
return connected;
}
static bool isSignalMetaMethodValid(const QMetaMethod &signal)
{
if (!signal.isValid()) {
qWarning("QSignalSpy: Null signal is not valid");
return false;
}
if (signal.methodType() != QMetaMethod::Signal) {
qWarning("QSignalSpy: Not a signal: '%s'", signal.methodSignature().constData());
return false;
}
return true;
}
static bool isObjectValid(const QObject *object)
{
const bool valid = !!object;
if (!valid)
qWarning("QSignalSpy: Cannot spy on a null object");
return valid;
}
void initArgs(const QMetaMethod &member, const QObject *obj)
{
QMutexLocker locker(&m_mutex);
args.reserve(member.parameterCount());
for (int i = 0; i < member.parameterCount(); ++i) {
QMetaType tp = member.parameterMetaType(i);
if (!tp.isValid() && obj) {
locker.unlock();
void *argv[] = { &tp, &i };
QMetaObject::metacall(const_cast<QObject*>(obj),
QMetaObject::RegisterMethodArgumentMetaType,
member.methodIndex(), argv);
locker.relock();
}
if (!tp.isValid()) {
qWarning("QSignalSpy: Unable to handle parameter '%s' of type '%s' of method '%s',"
" use qRegisterMetaType to register it.",
member.parameterNames().at(i).constData(),
member.parameterTypes().at(i).constData(),
member.name().constData());
}
args << tp.id();
}
}
void appendArgs(void **a)
{
QMutexLocker locker(&m_mutex);
QList<QVariant> list;
list.reserve(args.size());
for (qsizetype i = 0; i < args.size(); ++i) {
const QMetaType::Type type = static_cast<QMetaType::Type>(args.at(i));
if (type == QMetaType::QVariant)
list << *reinterpret_cast<QVariant *>(a[i + 1]);
else
list << QVariant(QMetaType(type), a[i + 1]);
}
append(std::move(list));
if (m_waiting) {
locker.unlock();
m_loop.exitLoop();
}
}
// the full, normalized signal name
QByteArray sig;
// holds the QMetaType types for the argument list of the signal
QList<int> args;
QTestEventLoop m_loop;
bool m_waiting = false;
QMutex m_mutex; // protects m_waiting, args and the QList base class, between appendArgs() and wait()
};
QT_END_NAMESPACE
#endif
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