CopperSpice API  1.7.2
QAbstractMessageHandler Class Referenceabstract

The QAbstractMessageHandler class provides a callback interface for handling messages. More...

Inheritance diagram for QAbstractMessageHandler:
QObject

Public Methods

 QAbstractMessageHandler (QObject *parent=nullptr)
 
virtual ~QAbstractMessageHandler ()
 
void message (QtMsgType type, const QString &description, const QUrl &identifier=QUrl (), const QSourceLocation &sourceLocation=QSourceLocation ())
 
- Public Methods inherited from QObject
 QObject (QObject *parent=nullptr)
 
 ~QObject ()
 
bool blockSignals (bool block)
 
const QList< QObject * > & children () const
 
bool connect (const QObject *sender, const QString &signalMethod, const QString &location, const QString &slotMethod, Qt::ConnectionType type=Qt::AutoConnection)
 
bool connect (const QObject *sender, const QString &signalMethod, const QString &slotMethod, Qt::ConnectionType type=Qt::AutoConnection)
 
bool disconnect (const QObject *receiver, const QString &slotMethod=QString ()) const
 
bool disconnect (const QString &signalMethod, const QString &location, const QObject *receiver=nullptr, const QString &slotMethod=QString ()) const
 
bool disconnect (const QString &signalMethod=QString (), const QObject *receiver=nullptr, const QString &slotMethod=QString ()) const
 
void dumpObjectInfo ()
 
void dumpObjectTree ()
 
QList< QStringdynamicPropertyNames () const
 
virtual bool event (QEvent *event)
 
virtual bool eventFilter (QObject *watched, QEvent *event)
 
template<typename T >
findChild (const QString &childName=QString ()) const
 
template<class T >
QList< T > findChildren (const QRegularExpression &regExp, Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
 
template<class T >
QList< T > findChildren (const QString &objName=QString (), Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
 
bool inherits (const QString &className) const
 
void installEventFilter (QObject *filterObj)
 
bool isWidgetType () const
 
bool isWindowType () const
 
void killTimer (int id)
 
const QMetaObjectmetaObject () const
 
void moveToThread (QThread *targetThread)
 
QString objectName () const
 
QObject * parent () const
 
template<class T = QVariant>
property (const QString &name) const
 
void removeEventFilter (QObject *obj)
 
void setObjectName (const QString &name)
 
void setParent (QObject *parent)
 
bool setProperty (const QString &name, const QVariant &value)
 
bool signalsBlocked () const
 
int startTimer (int interval, Qt::TimerType timerType=Qt::CoarseTimer)
 
QThreadthread () const
 

Protected Methods

virtual void handleMessage (QtMsgType type, const QString &description, const QUrl &identifier, const QSourceLocation &sourceLocation) = 0
 
- Protected Methods inherited from QObject
virtual void childEvent (QChildEvent *event)
 
virtual void connectNotify (const QMetaMethod &signalMethod) const
 
virtual void customEvent (QEvent *event)
 
virtual void disconnectNotify (const QMetaMethod &signalMethod) const
 
bool isSignalConnected (const QMetaMethod &signalMethod) const
 
int receivers (const QString &signal) const
 
QObject * sender () const
 
int senderSignalIndex () const
 
virtual void timerEvent (QTimerEvent *event)
 

Additional Inherited Members

- Public Signals inherited from QObject
void destroyed (QObject *obj=nullptr)
 
void objectNameChanged (const QString &objectName)
 
- Public Slots inherited from QObject
void deleteLater ()
 
- Static Public Methods inherited from QObject
static bool connect (const QObject *sender, const QMetaMethod &signalMethod, const QObject *receiver, const QMetaMethod &slotMethod, Qt::ConnectionType type=Qt::AutoConnection)
 
static bool connect (const QObject *sender, const QString &signalMethod, const QObject *receiver, const QString &slotMethod, Qt::ConnectionType type=Qt::AutoConnection, const QString &location=QString ())
 
static bool connect (const QObject *sender, const QString &signalMethod, const QString &location, const QObject *receiver, const QString &slotMethod, Qt::ConnectionType type=Qt::AutoConnection)
 
template<class Sender , class SignalClass , class... SignalArgs, class Receiver , class SlotClass , class... SlotArgs, class SlotReturn >
static bool connect (const Sender *sender, void (SignalClass::*signalMethod)(SignalArgs...), const Receiver *receiver, SlotReturn (SlotClass::*slotMethod)(SlotArgs...), Qt::ConnectionType type=Qt::AutoConnection)
 
template<class Sender , class SignalClass , class... SignalArgs, class Receiver , class T >
static bool connect (const Sender *sender, void (SignalClass::*signalMethod)(SignalArgs...), const Receiver *receiver, T slotLambda, Qt::ConnectionType type=Qt::AutoConnection)
 
static bool disconnect (const QObject *sender, const QMetaMethod &signalMethod, const QObject *receiver, const QMetaMethod &slotMethod)
 
static bool disconnect (const QObject *sender, const QString &signalMethod, const QObject *receiver, const QString &slotMethod)
 
static bool disconnect (const QObject *sender, const QString &signalMethod, const QString &location, const QObject *receiver, const QString &slotMethod)
 
template<class Sender , class SignalClass , class... SignalArgs, class Receiver , class SlotClass , class... SlotArgs, class SlotReturn >
static bool disconnect (const Sender *sender, void (SignalClass::*signalMethod)(SignalArgs...), const Receiver *receiver, SlotReturn (SlotClass::*slotMethod)(SlotArgs...))
 
template<class Sender , class SignalClass , class... SignalArgs, class Receiver >
static bool disconnect (const Sender *sender, void (SignalClass::*signalMethod)(SignalArgs...), const Receiver *receiver, std::nullptr_t slotMethod=nullptr)
 
template<class Sender , class SignalClass , class... SignalArgs, class Receiver , class T >
static bool disconnect (const Sender *sender, void (SignalClass::*signalMethod)(SignalArgs...), const Receiver *receiver, T slotMethod)
 
static QMetaObjectstaticMetaObject ()
 
static QString tr (const char *text, const char *comment=nullptr, std::optional< int > numArg=std::optional< int >())
 
- Properties inherited from QObject
 objectName
 

Detailed Description

The QAbstractMessageHandler class provides a callback interface for handling messages.

QAbstractMessageHandler is an abstract base class that provides a callback interface for handling messages. For example, class QXmlQuery parses and runs an XQuery. When it detects a compile or runtime error, it generates an appropriate error message, but rather than output the message itself, it passes the message to the message() function of its QAbstractMessageHandler. See QXmlQuery::setMessageHandler().

You create a message handler by subclassing QAbstractMessageHandler and implementing handleMessage(). You then pass a pointer to an instance of your subclass to any classes that must generate messages. The messages are sent to the message handler via the message() function, which forwards them to your handleMessge(). The effect is to serialize the handling of all messages, which means your QAbstractMessageHandler subclass is thread safe.

A single instance of QAbstractMessageHandler can be called on to handle messages from multiple sources. Hence, the content of a message, which is the description parameter passed to message() and handleMessage(), must be interpreted in light of the context that required the message to be sent. That context is specified by the identifier and sourceLocation parameters to message() handleMessage().

See also
http://www.w3.org/TR/xquery/#errors

Constructor & Destructor Documentation

QAbstractMessageHandler::QAbstractMessageHandler ( QObject parent = nullptr)

Constructs a QAbstractMessageHandler. The parent is passed to the QObject base class constructor.

QAbstractMessageHandler::~QAbstractMessageHandler ( )
virtual

Destructs this QAbstractMessageHandler.

Method Documentation

void QAbstractMessageHandler::handleMessage ( QtMsgType  type,
const QString description,
const QUrl identifier,
const QSourceLocation sourceLocation 
)
protectedpure virtual

This function must be implemented by the sub-class. message() will call this function, passing in its parameters, type, description, identifier and sourceLocation unmodified.

void QAbstractMessageHandler::message ( QtMsgType  type,
const QString description,
const QUrl identifier = QUrl(),
const QSourceLocation sourceLocation = QSourceLocation() 
)

Sends a message to this message handler. type is the kind of message being sent. description is the message content. The identifier is a URI that identifies the message and is the key to interpreting the other arguments.

Typically this class is used for reporting errors, as is the case for QXmlQuery, which uses a QAbstractMessageHandler to report compile and runtime XQuery errors. Using a QUrl as the message identifier was inspired by the explanation by a paper on "Error handling in the XQuery language". Because the identifier is composed of a namespace URI and a local part, identifiers with the same local part are unique. The caller is responsible for ensuring that identifier is either a valid QUrl or a default constructed QUrl.

sourceLocation identifies a location in a resource (i.e., file or document) where the need for reporting a message was detected.

This function unconditionally calls handleMessage(), passing all its parameters unmodified.

See also
http://www.w3.org/TR/xquery/#errors