mirror of
https://github.com/strawberrymusicplayer/strawberry
synced 2024-12-14 09:44:51 +01:00
237 lines
7.4 KiB
C++
237 lines
7.4 KiB
C++
/* This file is part of Strawberry.
|
|
Copyright 2011, David Sansome <me@davidsansome.com>
|
|
|
|
Strawberry is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
Strawberry 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.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with Strawberry. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#ifndef CLOSURE_H
|
|
#define CLOSURE_H
|
|
|
|
#include <functional>
|
|
#include <memory>
|
|
#include <chrono>
|
|
|
|
#include <QtGlobal>
|
|
#include <QObject>
|
|
#include <QFuture>
|
|
#include <QFutureWatcher>
|
|
#include <QMetaObject>
|
|
#include <QMetaMethod>
|
|
#include <QSharedPointer>
|
|
#include <QByteArray>
|
|
#include <QString>
|
|
#include <QList>
|
|
#include <QTimer>
|
|
|
|
#include "core/logging.h"
|
|
|
|
namespace _detail {
|
|
|
|
class ObjectHelper;
|
|
|
|
// Interface for ObjectHelper to call on signal emission.
|
|
class ClosureBase {
|
|
public:
|
|
virtual ~ClosureBase();
|
|
virtual void Invoke() = 0;
|
|
|
|
// Tests only.
|
|
ObjectHelper *helper() const;
|
|
|
|
protected:
|
|
explicit ClosureBase(ObjectHelper*);
|
|
ObjectHelper *helper_;
|
|
|
|
private:
|
|
Q_DISABLE_COPY(ClosureBase)
|
|
|
|
};
|
|
|
|
// QObject helper as templated QObjects do not work.
|
|
// Connects to the given signal and invokes the closure when called.
|
|
// Deletes itself and the Closure after being invoked.
|
|
class ObjectHelper : public QObject {
|
|
Q_OBJECT
|
|
public:
|
|
ObjectHelper(QObject *parent, const char *signal, ClosureBase *closure);
|
|
~ObjectHelper();
|
|
|
|
private slots:
|
|
void Invoked();
|
|
|
|
private:
|
|
std::unique_ptr<ClosureBase> closure_;
|
|
Q_DISABLE_COPY(ObjectHelper)
|
|
|
|
};
|
|
|
|
// Helpers for unpacking a variadic template list.
|
|
|
|
// Base case of no arguments.
|
|
void Unpack(QList<QGenericArgument>*);
|
|
|
|
template <typename Arg>
|
|
void Unpack(QList<QGenericArgument> *list, const Arg &arg) {
|
|
list->append(Q_ARG(Arg, arg));
|
|
}
|
|
|
|
template <typename Head, typename... Tail>
|
|
void Unpack(QList<QGenericArgument> *list, const Head &head, const Tail&... tail) {
|
|
Unpack(list, head);
|
|
Unpack(list, tail...);
|
|
}
|
|
|
|
template <typename... Args>
|
|
class Closure : public ClosureBase {
|
|
public:
|
|
Closure(
|
|
QObject *sender,
|
|
const char *signal,
|
|
QObject *receiver,
|
|
const char *slot,
|
|
const Args&... args)
|
|
: ClosureBase(new ObjectHelper(sender, signal, this)),
|
|
// std::bind is the easiest way to store an argument list.
|
|
function_(std::bind(&Closure<Args...>::Call, this, args...)),
|
|
receiver_(receiver) {
|
|
const QMetaObject *meta_receiver = receiver->metaObject();
|
|
QByteArray normalised_slot = QMetaObject::normalizedSignature(slot + 1);
|
|
const int index = meta_receiver->indexOfSlot(normalised_slot.constData());
|
|
Q_ASSERT(index != -1);
|
|
slot_ = meta_receiver->method(index);
|
|
QObject::connect(receiver_, SIGNAL(destroyed()), helper_, SLOT(deleteLater()));
|
|
}
|
|
|
|
virtual void Invoke() {
|
|
function_();
|
|
}
|
|
|
|
private:
|
|
void Call(const Args&... args) {
|
|
QList<QGenericArgument> arg_list;
|
|
Unpack(&arg_list, args...);
|
|
|
|
slot_.invoke(
|
|
receiver_,
|
|
arg_list.size() > 0 ? arg_list[0] : QGenericArgument(),
|
|
arg_list.size() > 1 ? arg_list[1] : QGenericArgument(),
|
|
arg_list.size() > 2 ? arg_list[2] : QGenericArgument(),
|
|
arg_list.size() > 3 ? arg_list[3] : QGenericArgument(),
|
|
arg_list.size() > 4 ? arg_list[4] : QGenericArgument(),
|
|
arg_list.size() > 5 ? arg_list[5] : QGenericArgument(),
|
|
arg_list.size() > 6 ? arg_list[6] : QGenericArgument(),
|
|
arg_list.size() > 7 ? arg_list[7] : QGenericArgument(),
|
|
arg_list.size() > 8 ? arg_list[8] : QGenericArgument(),
|
|
arg_list.size() > 9 ? arg_list[9] : QGenericArgument());
|
|
}
|
|
|
|
std::function<void()> function_;
|
|
QObject *receiver_;
|
|
QMetaMethod slot_;
|
|
};
|
|
|
|
template <typename T, typename... Args>
|
|
class SharedClosure : public Closure<Args...> {
|
|
public:
|
|
SharedClosure(
|
|
QSharedPointer<T> sender,
|
|
const char *signal,
|
|
QObject *receiver,
|
|
const char *slot,
|
|
const Args&... args)
|
|
: Closure<Args...>(
|
|
sender.data(),
|
|
signal,
|
|
receiver,
|
|
slot,
|
|
args...),
|
|
data_(sender) {
|
|
}
|
|
|
|
private:
|
|
QSharedPointer<T> data_;
|
|
};
|
|
|
|
class CallbackClosure : public ClosureBase {
|
|
public:
|
|
CallbackClosure(QObject *sender, const char *signal, std::function<void()> callback);
|
|
|
|
virtual void Invoke();
|
|
|
|
private:
|
|
std::function<void()> callback_;
|
|
};
|
|
|
|
} // namespace _detail
|
|
|
|
template <typename... Args>
|
|
_detail::ClosureBase *NewClosure(QObject *sender, const char *signal, QObject *receiver, const char *slot, const Args&... args) {
|
|
return new _detail::Closure<Args...>(sender, signal, receiver, slot, args...);
|
|
}
|
|
|
|
// QSharedPointer variant
|
|
template <typename T, typename... Args>
|
|
_detail::ClosureBase *NewClosure(QSharedPointer<T> sender, const char *signal, QObject *receiver, const char *slot, const Args&... args) {
|
|
return new _detail::SharedClosure<T, Args...>(sender, signal, receiver, slot, args...);
|
|
}
|
|
|
|
_detail::ClosureBase *NewClosure(QObject *sender, const char *signal, std::function<void()> callback);
|
|
|
|
template <typename... Args>
|
|
_detail::ClosureBase *NewClosure(QObject *sender, const char *signal, std::function<void(Args...)> callback, const Args&... args) {
|
|
return NewClosure(sender, signal, std::bind(callback, args...));
|
|
}
|
|
|
|
template <typename... Args>
|
|
_detail::ClosureBase *NewClosure(QObject *sender, const char *signal, void (*callback)(Args...), const Args&... args) {
|
|
return NewClosure(sender, signal, std::bind(callback, args...));
|
|
}
|
|
|
|
template <typename T, typename Unused, typename... Args>
|
|
_detail::ClosureBase *NewClosure(QObject *sender, const char *signal, T *receiver, Unused (T::*callback)(Args...), const Args&... args) {
|
|
return NewClosure(sender, signal, std::bind(callback, receiver, args...));
|
|
}
|
|
|
|
template <typename T, typename... Args>
|
|
_detail::ClosureBase *NewClosure(QFuture<T> future, QObject *receiver, const char *slot, const Args&... args) {
|
|
QFutureWatcher<T> *watcher = new QFutureWatcher<T>;
|
|
watcher->setFuture(future);
|
|
QObject::connect(watcher, SIGNAL(finished()), watcher, SLOT(deleteLater()));
|
|
return NewClosure(watcher, SIGNAL(finished()), receiver, slot, args...);
|
|
}
|
|
|
|
template <typename T, typename F, typename... Args>
|
|
_detail::ClosureBase *NewClosure(QFuture<T> future, const F &callback, const Args&... args) {
|
|
QFutureWatcher<T> *watcher = new QFutureWatcher<T>;
|
|
watcher->setFuture(future);
|
|
QObject::connect(watcher, SIGNAL(finished()), watcher, SLOT(deleteLater()));
|
|
return NewClosure(watcher, SIGNAL(finished()), callback, args...);
|
|
}
|
|
|
|
void DoAfter(QObject *receiver, const char *slot, int msec);
|
|
void DoAfter(std::function<void()> callback, std::chrono::milliseconds msec);
|
|
void DoInAMinuteOrSo(QObject *receiver, const char *slot);
|
|
|
|
template <typename R, typename P>
|
|
void DoAfter(std::function<void()> callback, std::chrono::duration<R, P> duration) {
|
|
QTimer *timer = new QTimer;
|
|
timer->setSingleShot(true);
|
|
NewClosure(timer, SIGNAL(timeout()), callback);
|
|
QObject::connect(timer, SIGNAL(timeout()), timer, SLOT(deleteLater()));
|
|
std::chrono::milliseconds msec = std::chrono::duration_cast<std::chrono::milliseconds>(duration);
|
|
timer->start(msec.count());
|
|
}
|
|
|
|
#endif // CLOSURE_H
|