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java.lang.Objectcom.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.
Nested Class Summary | |
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static class |
QEventLoop.ProcessEventsFlag
This enum controls the types of events processed by the processEvents functions. |
static class |
QEventLoop.ProcessEventsFlags
This QFlag class provides flags for the int enum. |
Nested classes/interfaces inherited from class com.trolltech.qt.QSignalEmitter |
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QSignalEmitter.AbstractSignal, QSignalEmitter.Signal0, QSignalEmitter.Signal1<A>, QSignalEmitter.Signal2<A,B>, QSignalEmitter.Signal3<A,B,C>, QSignalEmitter.Signal4<A,B,C,D>, QSignalEmitter.Signal5<A,B,C,D,E>, QSignalEmitter.Signal6<A,B,C,D,E,F>, QSignalEmitter.Signal7<A,B,C,D,E,F,G>, QSignalEmitter.Signal8<A,B,C,D,E,F,G,H>, QSignalEmitter.Signal9<A,B,C,D,E,F,G,H,I> |
Constructor Summary | |
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QEventLoop()
Equivalent to QEventLoop(0). |
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QEventLoop(QObject parent)
Constructs an event loop object with the given parent. |
Method Summary | |
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int |
exec()
Equivalent to exec(AllEvents). |
int |
exec(QEventLoop.ProcessEventsFlag... flags)
Enters the main event loop and waits until exit is called. |
int |
exec(QEventLoop.ProcessEventsFlags flags)
Enters the main event loop and waits until exit is called. |
void |
exit()
Equivalent to exit(0). |
void |
exit(int returnCode)
Tells the event loop to exit with a return code. |
static QEventLoop |
fromNativePointer(QNativePointer nativePointer)
This function returns the QEventLoop instance pointed to by nativePointer |
boolean |
isRunning()
Returns true if the event loop is running; otherwise returns false. |
boolean |
processEvents()
Equivalent to processEvents(AllEvents). |
boolean |
processEvents(QEventLoop.ProcessEventsFlag... flags)
Processes pending events that match flags until there are no more events to process. |
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 maximumTime 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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blockSignals, childEvent, children, connectSlotsByName, customEvent, disposeLater, dumpObjectInfo, dumpObjectTree, dynamicPropertyNames, event, eventFilter, findChild, findChild, findChild, findChildren, findChildren, findChildren, findChildren, installEventFilter, isWidgetType, killTimer, moveToThread, objectName, parent, property, removeEventFilter, setObjectName, setParent, setProperty, signalsBlocked, startTimer, thread, timerEvent |
Methods inherited from class com.trolltech.qt.QtJambiObject |
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dispose, disposed, finalize, reassignNativeResources, tr, tr, tr |
Methods inherited from class com.trolltech.qt.QSignalEmitter |
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disconnect, disconnect, signalSender |
Methods inherited from class java.lang.Object |
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clone, equals, getClass, hashCode, notify, notifyAll, toString, 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()
Equivalent to QEventLoop(0).
public QEventLoop(QObject parent)
Constructs an event loop object with the given parent.
Method Detail |
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public final int exec(QEventLoop.ProcessEventsFlag... flags)
Enters the main event loop and waits until 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.
public final int exec()
Equivalent to exec(AllEvents).
public final int exec(QEventLoop.ProcessEventsFlags flags)
Enters the main event loop and waits until 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.
public final void exit()
Equivalent to exit(0).
public final void exit(int returnCode)
Tells the event loop to exit with a return code.
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.
public final boolean isRunning()
Returns true if the event loop is running; otherwise returns false. The event loop is considered running from the time when exec is called until exit is called.
public final boolean processEvents(QEventLoop.ProcessEventsFlag... flags)
Processes pending events that match flags until there are no more events to process. Returns true if pending events were handled; 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 ExcludeUserInputEvents flag.
This function is simply a wrapper for QAbstractEventDispatcher::processEvents(). See the documentation for that function for details.
public final boolean processEvents()
Equivalent to processEvents(AllEvents).
public final boolean processEvents(QEventLoop.ProcessEventsFlags flags)
Processes pending events that match flags until there are no more events to process. Returns true if pending events were handled; 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 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)
Process pending events that match flags for a maximum of maximumTime milliseconds, or until there are no more events to process, whichever is shorter. 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.
Notes:
public final void quit()
Tells the event loop to exit normally.
Same as exit(0).
public final void wakeUp()
Wakes up the event loop.
public static QEventLoop fromNativePointer(QNativePointer nativePointer)
nativePointer
- the QNativePointer of which object should be returned.
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