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## com.trolltech.qt.core
Class QEventLoop

    java.lang.Object
      com.trolltech.qt.internal.QSignalEmitterInternal
          com.trolltech.qt.QSignalEmitter
              com.trolltech.qt.QtJambiObject
                  com.trolltech.qt.core.QObject
                      com.trolltech.qt.core.QEventLoop

All Implemented Interfaces:
  QtJambiInterface

    public class QEventLoop

extends QObject

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.

See also:
  `QAbstractEventDispatcher`.

Nested Class Summary
`static class` | `QEventLoop.ProcessEventsFlag` This enum controls the types of events processed by the `processEvents()` functions.
`static class` | `QEventLoop.ProcessEventsFlags` This is a flags class for com.trolltech.qt.core.QEventLoop.ProcessEventsFlag

Nested classes/interfaces inherited from class com.trolltech.qt.QSignalEmitter
`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

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
`int` | `exec()` Enters the main event loop and waits until `exit()` is called.
`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()` 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)` 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 `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
`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
`clone, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Methods inherited from interface com.trolltech.qt.QtJambiInterface
`disableGarbageCollection, nativeId, nativePointer, reenableGarbageCollection, setJavaOwnership`

Constructor Detail

### QEventLoop

    public QEventLoop()

  Constructs an event loop object with the given `parent`.

### QEventLoop

    public QEventLoop(QObject parent)

  Constructs an event loop object with the given `parent`.

Method Detail

### exec

    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()`.

See also:
  `QApplication::quit()`, `exit()`, and `processEvents()`.

### exec

    public final int exec()

  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()`.

See also:
  `QApplication::quit()`, `exit()`, and `processEvents()`.

### exec

    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()`.

See also:
  `QApplication::quit()`, `exit()`, and `processEvents()`.

### exit

    public final void exit()

  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.

See also:
  `QCoreApplication::quit()`, `quit()`, and `exec()`.

### exit

    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.

See also:
  `QCoreApplication::quit()`, `quit()`, and `exec()`.

### isRunning

    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.

See also:
  `exec()`, and `exit()`.

### processEvents

    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.

### processEvents

    public final boolean processEvents()

  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.

### processEvents

    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.

### processEvents

    public final 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. 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:

  - This function does not process events continuously; it returns after all available events are processed.
  - Specifying the `WaitForMoreEvents` flag makes no sense and will be ignored.

### quit

    public final void quit()

  Tells the event loop to exit normally.

  Same as exit(0).

See also:
  `QCoreApplication::quit()`, and `exit()`.

### wakeUp

    public final void wakeUp()

  Wakes up the event loop.

See also:
  `QAbstractEventDispatcher::wakeUp()`.

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