QEventDispatcherX11 Class Reference

#include <qeventdispatcher_x11_p.h>

Inheritance diagram for QEventDispatcherX11:

Public Functions
void	closingDown ()
void	flush ()
	Flushes the event queue. More...
bool	hasPendingEvents ()
	Returns true if there is an event waiting; otherwise returns false. More...
bool	processEvents (QEventLoop::ProcessEventsFlags flags)
	Processes pending events that match flags until there are no more events to process. More...
	QEventDispatcherX11 (QObject *parent=0)
void	startingUp ()
	~QEventDispatcherX11 ()
Public Functions inherited from QEventDispatcherUNIX
void	interrupt ()
	Interrupts event dispatching; i. More...
	QEventDispatcherUNIX (QObject *parent=0)
QList< TimerInfo >	registeredTimers (QObject *object) const
	Returns a list of registered timers for object. More...
void	registerSocketNotifier (QSocketNotifier *notifier)
	Registers notifier with the event loop. More...
void	registerTimer (int timerId, int interval, QObject *object)
void	unregisterSocketNotifier (QSocketNotifier *notifier)
	Unregisters notifier from the event dispatcher. More...
bool	unregisterTimer (int timerId)
bool	unregisterTimers (QObject *object)
void	wakeUp ()
	Wakes up the event loop. More...
	~QEventDispatcherUNIX ()
Public Functions inherited from QAbstractEventDispatcher
bool	filterEvent (void *message)
	Sends message through the event filter that was set by setEventFilter(). More...
	QAbstractEventDispatcher (QObject *parent=0)
	Constructs a new event dispatcher with the given parent. More...
int	registerTimer (int interval, QObject *object)
	Registers a timer with the specified interval for the given object. More...
EventFilter	setEventFilter (EventFilter filter)
	Replaces the event filter function for this QAbstractEventDispatcher with filter and returns the replaced event filter function. More...
	~QAbstractEventDispatcher ()
	Destroys the event dispatcher. More...
Public Functions inherited from QObject
bool	blockSignals (bool b)
	If block is true, signals emitted by this object are blocked (i.e., emitting a signal will not invoke anything connected to it). More...
const QObjectList &	children () const
	Returns a list of child objects. More...
bool	connect (const QObject *sender, const char *signal, const char *member, Qt::ConnectionType type=Qt::AutoConnection) const
bool	disconnect (const char *signal=0, const QObject *receiver=0, const char *member=0)
bool	disconnect (const QObject *receiver, const char *member=0)
void	dumpObjectInfo ()
	Dumps information about signal connections, etc. More...
void	dumpObjectTree ()
	Dumps a tree of children to the debug output. More...
QList< QByteArray >	dynamicPropertyNames () const
	Returns the names of all properties that were dynamically added to the object using setProperty(). More...
virtual bool	event (QEvent *)
	This virtual function receives events to an object and should return true if the event e was recognized and processed. More...
virtual bool	eventFilter (QObject *, QEvent *)
	Filters events if this object has been installed as an event filter for the watched object. More...
template<typename T >
T	findChild (const QString &aName=QString()) const
	Returns the child of this object that can be cast into type T and that is called name, or 0 if there is no such object. More...
template<typename T >
QList< T >	findChildren (const QString &aName=QString()) const
	Returns all children of this object with the given name that can be cast to type T, or an empty list if there are no such objects. More...
template<typename T >
QList< T >	findChildren (const QRegExp &re) const
bool	inherits (const char *classname) const
	Returns true if this object is an instance of a class that inherits className or a QObject subclass that inherits className; otherwise returns false. More...
void	installEventFilter (QObject *)
	Installs an event filter filterObj on this object. More...
bool	isWidgetType () const
	Returns true if the object is a widget; otherwise returns false. More...
void	killTimer (int id)
	Kills the timer with timer identifier, id. More...
virtual const QMetaObject *	metaObject () const
	Returns a pointer to the meta-object of this object. More...
void	moveToThread (QThread *thread)
	Changes the thread affinity for this object and its children. More...
QString	objectName () const
QObject *	parent () const
	Returns a pointer to the parent object. More...
QVariant	property (const char *name) const
	Returns the value of the object's name property. More...
Q_INVOKABLE	QObject (QObject *parent=0)
	Constructs an object with parent object parent. More...
void	removeEventFilter (QObject *)
	Removes an event filter object obj from this object. More...
void	setObjectName (const QString &name)
void	setParent (QObject *)
	Makes the object a child of parent. More...
bool	setProperty (const char *name, const QVariant &value)
	Sets the value of the object's name property to value. More...
void	setUserData (uint id, QObjectUserData *data)
bool	signalsBlocked () const
	Returns true if signals are blocked; otherwise returns false. More...
int	startTimer (int interval)
	Starts a timer and returns a timer identifier, or returns zero if it could not start a timer. More...
QThread *	thread () const
	Returns the thread in which the object lives. More...
QObjectUserData *	userData (uint id) const
virtual	~QObject ()
	Destroys the object, deleting all its child objects. More...

Protected Functions
int	select (int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, timeval *timeout)
Protected Functions inherited from QEventDispatcherUNIX
int	activateSocketNotifiers ()
int	activateTimers ()
	QEventDispatcherUNIX (QEventDispatcherUNIXPrivate &dd, QObject *parent=0)
void	setSocketNotifierPending (QSocketNotifier *notifier)
Protected Functions inherited from QAbstractEventDispatcher
	QAbstractEventDispatcher (QAbstractEventDispatcherPrivate &, QObject *parent)
Protected Functions inherited from QObject
virtual void	childEvent (QChildEvent *)
	This event handler can be reimplemented in a subclass to receive child events. More...
virtual void	connectNotify (const char *signal)
	This virtual function is called when something has been connected to signal in this object. More...
virtual void	customEvent (QEvent *)
	This event handler can be reimplemented in a subclass to receive custom events. More...
virtual void	disconnectNotify (const char *signal)
	This virtual function is called when something has been disconnected from signal in this object. More...
	QObject (QObjectPrivate &dd, QObject *parent=0)
int	receivers (const char *signal) const
	Returns the number of receivers connected to the signal. More...
QObject *	sender () const
	Returns a pointer to the object that sent the signal, if called in a slot activated by a signal; otherwise it returns 0. More...
int	senderSignalIndex () const
virtual void	timerEvent (QTimerEvent *)
	This event handler can be reimplemented in a subclass to receive timer events for the object. More...

Additional Inherited Members
Public Types inherited from QAbstractEventDispatcher
typedef bool(*	EventFilter) (void *message)
	Typedef for a function with the signature. More...
typedef QPair< int, int >	TimerInfo
	Typedef for QPair<int, int>. More...
Public Slots inherited from QObject
void	deleteLater ()
	Schedules this object for deletion. More...
Signals inherited from QAbstractEventDispatcher
void	aboutToBlock ()
	This signal is emitted before the event loop calls a function that could block. More...
void	awake ()
	This signal is emitted after the event loop returns from a function that could block. More...
Signals inherited from QObject
void	destroyed (QObject *=0)
	This signal is emitted immediately before the object obj is destroyed, and can not be blocked. More...
Static Public Functions inherited from QAbstractEventDispatcher
static QAbstractEventDispatcher *	instance (QThread *thread=0)
	Returns a pointer to the event dispatcher object for the specified thread. More...
Static Public Functions inherited from QObject
static bool	connect (const QObject *sender, const char *signal, const QObject *receiver, const char *member, Qt::ConnectionType=Qt::AutoConnection)
	Creates a connection of the given type from the signal in the sender object to the method in the receiver object. More...
static bool	connect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &method, Qt::ConnectionType type=Qt::AutoConnection)
static bool	disconnect (const QObject *sender, const char *signal, const QObject *receiver, const char *member)
	Disconnects signal in object sender from method in object receiver. More...
static bool	disconnect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &member)
static uint	registerUserData ()
static QString	tr (const char *sourceText, const char *comment=0, int n=-1)
static QString	trUtf8 (const char *sourceText, const char *comment=0, int n=-1)
Static Public Variables inherited from QObject
static const QMetaObject	staticMetaObject
	This variable stores the meta-object for the class. More...
Protected Variables inherited from QObject
QScopedPointer< QObjectData >	d_ptr
Static Protected Variables inherited from QObject
static const QMetaObject	staticQtMetaObject
Related Functions inherited from QObject
T	qFindChildqFindChildren (const QObject *obj, const QString &name)()
QList< T >	qFindChildrenqFindChildren (const QObject *obj, const QString &name)()
QList< T >	qFindChildrenqFindChildren (const QObject *obj, const QRegExp &regExp)()
T *	qobject_cast (QObject *object)
	QObjectList
void *	qt_find_obj_child (QObject *parent, const char *type, const QString &name)
	Returns a pointer to the object named name that inherits type and with a given parent. More...

Detailed Description

Definition at line 62 of file qeventdispatcher_x11_p.h.

Constructors and Destructors

QEventDispatcherX11()

QEventDispatcherX11::QEventDispatcherX11 ( QObject *  parent = 0 )

explicit

Definition at line 63 of file qeventdispatcher_x11.cpp.

    : QEventDispatcherUNIX(*new QEventDispatcherX11Private, parent)
{ }

~QEventDispatcherX11()

QEventDispatcherX11::~QEventDispatcherX11

(

)

Definition at line 67 of file qeventdispatcher_x11.cpp.

{ }

Functions

closingDown()

void QEventDispatcherX11::closingDown ( )

virtual

Warning

This function is not part of the public interface.

Reimplemented from QAbstractEventDispatcher.

Definition at line 174 of file qeventdispatcher_x11.cpp.

{
    Q_D(QEventDispatcherX11);
    d->xfd = -1;
}

flush()

void QEventDispatcherX11::flush ( )

virtual

Flushes the event queue.

This normally returns almost immediately. Does nothing on platforms other than X11.

Reimplemented from QEventDispatcherUNIX.

Definition at line 163 of file qeventdispatcher_x11.cpp.

{
    XFlush(X11->display);
}

hasPendingEvents()

bool QEventDispatcherX11::hasPendingEvents ( )

virtual

Returns true if there is an event waiting; otherwise returns false.

Reimplemented from QEventDispatcherUNIX.

Definition at line 157 of file qeventdispatcher_x11.cpp.

{
    extern uint qGlobalPostedEventsCount(); // from qapplication.cpp
    return (qGlobalPostedEventsCount() || XPending(X11->display));
}

processEvents()

bool QEventDispatcherX11::processEvents ( QEventLoop::ProcessEventsFlags  flags )

virtual

Processes pending events that match flags until there are no more events to process.

Returns true if an event was processed; otherwise returns false.

This function is especially useful if you have a long running operation and want to show its progress without allowing user input; i.e. by using the QEventLoop::ExcludeUserInputEvents flag.

If the QEventLoop::WaitForMoreEvents flag is set in flags, the behavior of this function is as follows:

• If events are available, this function returns after processing them.

• If no events are available, this function will wait until more are available and return after processing newly available events.

If the QEventLoop::WaitForMoreEvents flag is not set in flags, and no events are available, this function will return immediately.

Note: This function does not process events continuously; it returns after all available events are processed.

See also

hasPendingEvents()

Reimplemented from QEventDispatcherUNIX.

Definition at line 70 of file qeventdispatcher_x11.cpp.

{
    Q_D(QEventDispatcherX11);

    d->interrupt = false;
    QApplication::sendPostedEvents();

    ulong marker = XNextRequest(X11->display);
    int nevents = 0;
    do {
        while (!d->interrupt) {
            XEvent event;
            if (!(flags & QEventLoop::ExcludeUserInputEvents)
                && !d->queuedUserInputEvents.isEmpty()) {
                // process a pending user input event
                event = d->queuedUserInputEvents.takeFirst();
            } else if (XEventsQueued(X11->display, QueuedAlready)) {
                // process events from the X server
                XNextEvent(X11->display, &event);

                if (flags & QEventLoop::ExcludeUserInputEvents) {
                    // queue user input events
                    switch (event.type) {
                    case ButtonPress:
                    case ButtonRelease:
                    case MotionNotify:
                    case XKeyPress:
                    case XKeyRelease:
                    case EnterNotify:
                    case LeaveNotify:
                        d->queuedUserInputEvents.append(event);
                        continue;

                    case ClientMessage:
                        // only keep the wm_take_focus and
                        // _qt_scrolldone protocols, queue all other
                        // client messages
                        if (event.xclient.format == 32) {
                            if (event.xclient.message_type == ATOM(WM_PROTOCOLS) &&
                                (Atom) event.xclient.data.l[0] == ATOM(WM_TAKE_FOCUS)) {
                                break;
                            } else if (event.xclient.message_type == ATOM(_QT_SCROLL_DONE)) {
                                break;
                            }
                        }
                        d->queuedUserInputEvents.append(event);
                        continue;

                    default:
                        break;
                    }
                }
            } else {
                // no event to process
                break;
            }

            // send through event filter
            if (filterEvent(&event))
                continue;

            nevents++;
            if (qApp->x11ProcessEvent(&event) == 1)
                return true;

            if (event.xany.serial >= marker) {
                if (XEventsQueued(X11->display, QueuedAfterFlush))
                    flags &= ~QEventLoop::WaitForMoreEvents;
                goto out;
            }
        }
    } while (!d->interrupt && XEventsQueued(X11->display, QueuedAfterFlush));

 out:
    if (!d->interrupt) {
        const uint exclude_all =
            QEventLoop::ExcludeSocketNotifiers | QEventLoop::X11ExcludeTimers | QEventLoop::WaitForMoreEvents;
        if (nevents > 0 && ((uint)flags & exclude_all) == exclude_all) {
            QApplication::sendPostedEvents();
            return nevents > 0;
        }
        // return true if we handled events, false otherwise
        return QEventDispatcherUNIX::processEvents(flags) ||  (nevents > 0);
    }
    return nevents > 0;
}

select()

int QEventDispatcherX11::select ( int  nfds, fd_set *  readfds, fd_set *  writefds, fd_set *  exceptfds, timeval *  timeout  )

protectedvirtual

Reimplemented from QEventDispatcherUNIX.

Definition at line 180 of file qeventdispatcher_x11.cpp.

{
    Q_D(QEventDispatcherX11);
    if (d->xfd > 0) {
        nfds = qMax(nfds - 1, d->xfd) + 1;
        FD_SET(d->xfd, readfds);
    }
    return QEventDispatcherUNIX::select(nfds, readfds, writefds, exceptfds, timeout);
}

startingUp()

void QEventDispatcherX11::startingUp ( )

virtual

Warning

This function is not part of the public interface.

Reimplemented from QAbstractEventDispatcher.

Definition at line 168 of file qeventdispatcher_x11.cpp.

{
    Q_D(QEventDispatcherX11);
    d->xfd = XConnectionNumber(X11->display);
}

---

The documentation for this class was generated from the following files:

• /src/gui/kernel/qeventdispatcher_x11_p.h
• /src/gui/kernel/qeventdispatcher_x11.cpp