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java.lang.Objectcom.trolltech.qt.internal.QSignalEmitterInternal
com.trolltech.qt.QSignalEmitter
com.trolltech.qt.QtJambiObject
com.trolltech.qt.core.QObject
com.trolltech.qt.core.QEventLoop
public class QEventLoop
The QEventLoop class provides a means of entering and leaving an event loop. At any time, you can create a QEventLoop object and call exec()
on it to start a local event loop. From within the event loop, calling exit()
will force exec()
to return.
QAbstractEventDispatcher
.
Nested Class Summary | |
---|---|
static class |
QEventLoop.ProcessEventsFlag
This enum controls the types of events processed by the processEvents() functions. |
static class |
QEventLoop.ProcessEventsFlags
|
Nested classes/interfaces inherited from class com.trolltech.qt.QSignalEmitter |
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QSignalEmitter.AbstractSignal, QSignalEmitter.Signal0, QSignalEmitter.Signal1, QSignalEmitter.Signal2, QSignalEmitter.Signal3, QSignalEmitter.Signal4, QSignalEmitter.Signal5, QSignalEmitter.Signal6, QSignalEmitter.Signal7, QSignalEmitter.Signal8, QSignalEmitter.Signal9 |
Nested classes/interfaces inherited from class com.trolltech.qt.internal.QSignalEmitterInternal |
---|
com.trolltech.qt.internal.QSignalEmitterInternal.AbstractSignalInternal |
Field Summary |
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Fields inherited from class com.trolltech.qt.internal.QSignalEmitterInternal |
---|
currentSender |
Constructor Summary | |
---|---|
QEventLoop()
Constructs an event loop object with the given parent. |
|
QEventLoop(QObject parent)
Constructs an event loop object with the given parent. |
Method Summary | |
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int |
exec()
Enters the main event loop and waits until exit() is called. |
int |
exec(QEventLoop.ProcessEventsFlag[] flags)
|
int |
exec(QEventLoop.ProcessEventsFlags flags)
Enters the main event loop and waits until exit() is called. |
void |
exit()
Tells the event loop to exit with a return code. |
void |
exit(int returnCode)
Tells the event loop to exit with a return code. |
boolean |
isRunning()
Returns true if the event loop is running; otherwise returns false. |
boolean |
processEvents()
Processes pending events that match flags until there are no more events to process. |
boolean |
processEvents(QEventLoop.ProcessEventsFlag[] flags)
|
boolean |
processEvents(QEventLoop.ProcessEventsFlags flags)
Processes pending events that match flags until there are no more events to process. |
void |
processEvents(QEventLoop.ProcessEventsFlags flags,
int maximumTime)
Process pending events that match flags for a maximum of maxTime milliseconds, or until there are no more events to process, whichever is shorter. |
void |
quit()
Tells the event loop to exit normally. |
void |
wakeUp()
Wakes up the event loop. |
Methods inherited from class com.trolltech.qt.core.QObject |
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childEvent, children, connectSlotsByName, customEvent, disposeLater, dumpObjectInfo, dumpObjectTree, dynamicPropertyNames, event, eventFilter, findChild, findChild, findChild, findChildren, findChildren, findChildren, findChildren, indexOfProperty, installEventFilter, isWidgetType, killTimer, moveToThread, objectName, parent, properties, property, removeEventFilter, setObjectName, setParent, setProperty, startTimer, timerEvent, toString, userProperty |
Methods inherited from class com.trolltech.qt.QtJambiObject |
---|
dispose, disposed, equals, finalize, reassignNativeResources, tr, tr, tr |
Methods inherited from class com.trolltech.qt.QSignalEmitter |
---|
blockSignals, disconnect, disconnect, signalsBlocked, signalSender, thread |
Methods inherited from class com.trolltech.qt.internal.QSignalEmitterInternal |
---|
__qt_signalInitialization |
Methods inherited from class java.lang.Object |
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clone, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Methods inherited from interface com.trolltech.qt.QtJambiInterface |
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disableGarbageCollection, nativeId, nativePointer, reenableGarbageCollection, setJavaOwnership |
Constructor Detail |
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public QEventLoop()
public QEventLoop(QObject parent)
Method Detail |
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public final int exec(QEventLoop.ProcessEventsFlag[] flags)
public final int exec()
exit()
is called. Returns the value that was passed to exit()
. If flags are specified, only events of the types allowed by the flags will be processed.
It is necessary to call this function to start event handling. The main event loop receives events from the window system and dispatches these to the application widgets.
Generally speaking, no user interaction can take place before calling exec()
. As a special case, modal widgets like QMessageBox
can be used before calling exec()
, because modal widgets use their own local event loop.
To make your application perform idle processing (i.e. executing a special function whenever there are no pending events), use a QTimer
with 0 timeout. More sophisticated idle processing schemes can be achieved using processEvents()
.
QApplication::quit()
, exit()
, and processEvents()
.
public final int exec(QEventLoop.ProcessEventsFlags flags)
exit()
is called. Returns the value that was passed to exit()
. If flags are specified, only events of the types allowed by the flags will be processed.
It is necessary to call this function to start event handling. The main event loop receives events from the window system and dispatches these to the application widgets.
Generally speaking, no user interaction can take place before calling exec()
. As a special case, modal widgets like QMessageBox
can be used before calling exec()
, because modal widgets use their own local event loop.
To make your application perform idle processing (i.e. executing a special function whenever there are no pending events), use a QTimer
with 0 timeout. More sophisticated idle processing schemes can be achieved using processEvents()
.
QApplication::quit()
, exit()
, and processEvents()
.
public final void exit()
After this function has been called, the event loop returns from the call to exec()
. The exec()
function returns returnCode.
By convention, a returnCode of 0 means success, and any non-zero value indicates an error.
Note that unlike the C library function of the same name, this function does return to the caller -- it is event processing that stops.
QCoreApplication::quit()
, quit()
, and exec()
.
public final void exit(int returnCode)
After this function has been called, the event loop returns from the call to exec()
. The exec()
function returns returnCode.
By convention, a returnCode of 0 means success, and any non-zero value indicates an error.
Note that unlike the C library function of the same name, this function does return to the caller -- it is event processing that stops.
QCoreApplication::quit()
, quit()
, and exec()
.
public final boolean isRunning()
exec()
is called until exit()
is called. exec()
, and exit()
.
public final boolean processEvents(QEventLoop.ProcessEventsFlag[] flags)
public final boolean processEvents()
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 ExcludeUserInputEvents
flag.
This function is simply a wrapper for QAbstractEventDispatcher::processEvents()
. See the documentation for that function for details.
public final boolean processEvents(QEventLoop.ProcessEventsFlags flags)
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 ExcludeUserInputEvents
flag.
This function is simply a wrapper for QAbstractEventDispatcher::processEvents()
. See the documentation for that function for details.
public final void processEvents(QEventLoop.ProcessEventsFlags flags, int maximumTime)
ExcludeUserInputEvents
flag. Notes:
WaitForMoreEvents
flag makes no sense and will be ignored.
public final void quit()
Same as exit(0).
QCoreApplication::quit()
, and exit()
.
public final void wakeUp()
QAbstractEventDispatcher::wakeUp()
.
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