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#ifndef CONTROLPROXY_H
#define CONTROLPROXY_H
#include <QObject>
#include <QSharedPointer>
#include <QString>
#include "control/control.h"
#include "preferences/usersettings.h"
// This class is the successor of ControlObjectThread. It should be used for
// new code to avoid unnecessary locking during send if no slot is connected.
// Do not (re-)connect slots during runtime, since this locks the mutex in
// QMetaObject::activate().
// Be sure that the ControlProxy is created and deleted from the same
// thread, otherwise a pending signal may lead to a segfault (Bug #1406124).
// Parent it to the the creating object to achieve this.
class ControlProxy : public QObject {
Q_OBJECT
public:
ControlProxy(QObject* pParent = NULL);
ControlProxy(const QString& g, const QString& i, QObject* pParent = NULL);
ControlProxy(const char* g, const char* i, QObject* pParent = NULL);
ControlProxy(const ConfigKey& key, QObject* pParent = NULL);
virtual ~ControlProxy();
void initialize(const ConfigKey& key, bool warn = true);
const ConfigKey& getKey() const {
return m_key;
}
template <typename Receiver, typename Slot>
bool connectValueChanged(Receiver receiver,
Slot func, Qt::ConnectionType requestedConnectionType = Qt::AutoConnection) {
if (!m_pControl) {
return false;
}
// We connect to the
// ControlObjectPrivate only once and in a way that
// the requested ConnectionType is working as desired.
// We try to avoid direct connections if not requested
// since you cannot safely delete an object with a pending
// direct connection. This fixes bug Bug #1406124
// requested: Auto -> COP = Auto / SCO = Auto
// requested: Direct -> COP = Direct / SCO = Direct
// requested: Queued -> COP = Queued / SCO = Auto
// requested: BlockingQueued -> Assert(false)
auto copSlot = &ControlProxy::slotValueChangedAuto;
Qt::ConnectionType copConnection;
Qt::ConnectionType scoConnection;
switch(requestedConnectionType) {
case Qt::AutoConnection:
copConnection = Qt::AutoConnection;
scoConnection = Qt::AutoConnection;
break;
case Qt::DirectConnection:
copSlot = &ControlProxy::slotValueChangedDirect;
copConnection = Qt::DirectConnection;
scoConnection = Qt::DirectConnection;
break;
case Qt::QueuedConnection:
copSlot = &ControlProxy::slotValueChangedQueued;
copConnection = Qt::QueuedConnection;
scoConnection = Qt::AutoConnection;
break;
case Qt::BlockingQueuedConnection:
// We must not block the signal source by a blocking connection
DEBUG_ASSERT(false);
return false;
default:
DEBUG_ASSERT(false);
return false;
}
if (!connect(this, &ControlProxy::valueChanged, receiver, func, scoConnection)) {
return false;
}
// Connect to ControlObjectPrivate only if required. Do not allow
// duplicate connections.
// use only explicit direct connection if requested
// the caller must not delete this until the all signals are
// processed to avoid segfaults
connect(m_pControl.data(), &ControlDoublePrivate::valueChanged,
this, copSlot,
static_cast<Qt::ConnectionType>(copConnection | Qt::UniqueConnection));
return true;
}
// TODO: get the compiler to accept parent() for the receiver
//template <typename Slot>
//bool connectValueChanged(Slot func, Qt::ConnectionType type = Qt::AutoConnection) {
// DEBUG_ASSERT(parent() != nullptr);
// return connectValueChanged(parent(), func, type);
//}
// Called from update();
virtual void emitValueChanged() {
emit(valueChanged(get()));
}
inline bool valid() const { return m_pControl != NULL; }
// Returns the value of the object. Thread safe, non-blocking.
inline double get() const {
return m_pControl ? m_pControl->get() : 0.0;
}
// Returns the bool interpretation of the value
inline bool toBool() const {
return get() > 0.0;
}
// Returns the parameterized value of the object. Thread safe, non-blocking.
inline double getParameter() const {
return m_pControl ? m_pControl->getParameter() : 0.0;
}
// Returns the parameterized value of the object. Thread safe, non-blocking.
inline double getParameterForValue(double value) const {
return m_pControl ? m_pControl->getParameterForValue(value) : 0.0;
}
// Returns the normalized parameter of the object. Thread safe, non-blocking.
inline double getDefault() const {
return m_pControl ? m_pControl->defaultValue() : 0.0;
}
public slots:
// Set the control to a new value. Non-blocking.
inline void slotSet(double v) {
set(v);
}
// Sets the control value to v. Thread safe, non-blocking.
void set(double v) {
if (m_pControl) {
m_pControl->set(v, this);
}
}
// Sets the control parameterized value to v. Thread safe, non-blocking.
void setParameter(double v) {
if (m_pControl) {
m_pControl->setParameter(v, this);
}
}
// Resets the control to its default value. Thread safe, non-blocking.
void reset() {
if (m_pControl) {
// NOTE(rryan): This is important. The originator of this action does
// not know the resulting value so it makes sense that we should emit a
// general valueChanged() signal even though the change originated from
// us. For this reason, we provide NULL here so that the change is
// not filtered in valueChanged()
m_pControl->reset();
}
}
signals:
// This signal must not connected by connect(). Use connectValueChanged()
// instead. It will connect to the base ControlDoublePrivate as well.
void valueChanged(double);
protected slots:
// Receives the value from the master control by a unique direct connection
void slotValueChangedDirect(double v, QObject* pSetter) {
if (pSetter != this) {
// This is base implementation of this function without scaling
emit(valueChanged(v));
}
}
// Receives the value from the master control by a unique auto connection
void slotValueChangedAuto(double v, QObject* pSetter) {
if (pSetter != this) {
// This is base implementation of this function without scaling
emit(valueChanged(v));
}
}
// Receives the value from the master control by a unique Queued connection
void slotValueChangedQueued(double v, QObject* pSetter) {
if (pSetter != this) {
// This is base implementation of this function without scaling
emit(valueChanged(v));
}
}
protected:
ConfigKey m_key;
// Pointer to connected control.
QSharedPointer<ControlDoublePrivate> m_pControl;
};
#endif // CONTROLPROXY_H
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