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