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## com.trolltech.qt.core
Class QAbstractEventDispatcher

    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.QAbstractEventDispatcher

All Implemented Interfaces:
  QtJambiInterface

    public abstract class QAbstractEventDispatcher

extends QObject

The QAbstractEventDispatcher class provides an interface to manage Qt's event queue. An event dispatcher receives events from the window system and other sources. It then sends them to the `QCoreApplication` or `QApplication` instance for processing and delivery. QAbstractEventDispatcher provides fine-grained control over event delivery.

For simple control of event processing use `QCoreApplication::processEvents()`.

For finer control of the application's event loop, call `instance()` and call functions on the QAbstractEventDispatcher object that is returned. If you want to use your own instance of QAbstractEventDispatcher or of a QAbstractEventDispatcher subclass, you must create your instance before you create the `QApplication` object.

The main event loop is started by calling `QCoreApplication::exec()`, and stopped by calling `QCoreApplication::exit()`. Local event loops can be created using `QEventLoop`.

Programs that perform long operations can call `processEvents()` with a bitwise OR combination of various `QEventLoop::ProcessEventsFlag` values to control which events should be delivered.

QAbstractEventDispatcher also allows the integration of an external event loop with the Qt event loop. For example, the Motif Extension Qt Solution includes a reimplementation of QAbstractEventDispatcher that merges Qt and Motif events together.

See also:
  `QEventLoop`, and `QCoreApplication`.

Nested Class Summary

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
`QSignalEmitter.Signal0` | `aboutToBlock` This signal is emitted before the event loop calls a function that could block.
`QSignalEmitter.Signal0` | `awake` This signal is emitted after the event loop returns from a function that could block.

Fields inherited from class com.trolltech.qt.internal.QSignalEmitterInternal
`currentSender`

Constructor Summary
`QAbstractEventDispatcher()` Constructs a new event dispatcher with the given `parent`.
`QAbstractEventDispatcher(QObject parent)` Constructs a new event dispatcher with the given `parent`.

Method Summary
`abstract void` | `flush()` Flushes the event queue.
`abstract boolean` | `hasPendingEvents()` Returns true if there is an event waiting; otherwise returns false.
`static QAbstractEventDispatcher` | `instance()` Returns a pointer to the event dispatcher object for the specified `thread`.
`static QAbstractEventDispatcher` | `instance(java.lang.Thread thread)` Returns a pointer to the event dispatcher object for the specified `thread`.
`abstract void` | `interrupt()` Interrupts event dispatching; i.
`abstract boolean` | `processEvents(QEventLoop.ProcessEventsFlags flags)` Processes pending events that match `flags` until there are no more events to process.
`abstract java.util.List` | `registeredTimers(QObject object)` Returns a list of registered timers for `object`.
`abstract void` | `registerSocketNotifier(QSocketNotifier notifier)` Registers `notifier` with the event loop.
`abstract void` | `registerTimer(int timerId, int interval, QObject object)` Register a timer with the specified `timerId` and `interval` for the given `object`.
`int` | `registerTimer(int interval, QObject object)` Registers a timer with the specified `interval` for the given `object`.
`abstract void` | `unregisterSocketNotifier(QSocketNotifier notifier)` Unregisters `notifier` from the event dispatcher.
`abstract boolean` | `unregisterTimer(int timerId)` Unregisters the timer with the given `timerId`.
`abstract boolean` | `unregisterTimers(QObject object)` Unregisters all the timers associated with the given `object`.
`abstract 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`

Field Detail

### aboutToBlock

    public final QSignalEmitter.Signal0 aboutToBlock

  This signal is emitted before the event loop calls a function that could block.

See also:
  `awake()` .

### awake

    public final QSignalEmitter.Signal0 awake

  This signal is emitted after the event loop returns from a function that could block.

See also:
  `wakeUp()`, and `aboutToBlock()` .

Constructor Detail

### QAbstractEventDispatcher

    public QAbstractEventDispatcher()

  Constructs a new event dispatcher with the given `parent`.

### QAbstractEventDispatcher

    public QAbstractEventDispatcher(QObject parent)

  Constructs a new event dispatcher with the given `parent`.

Method Detail

### registerTimer

    public final int registerTimer(int interval,
                                   QObject object)

  Registers a timer with the specified `interval` for the given `object`.

### flush

    public abstract void flush()

  Flushes the event queue. This normally returns almost immediately. Does nothing on platforms other than X11.

### hasPendingEvents

    public abstract boolean hasPendingEvents()

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

### interrupt

    public abstract void interrupt()

  Interrupts event dispatching; i. . the event dispatcher will return from `processEvents()` as soon as possible.

### processEvents

    public abstract boolean processEvents(QEventLoop.ProcessEventsFlags flags)

  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()`.

### registerSocketNotifier

    public abstract void registerSocketNotifier(QSocketNotifier notifier)

  Registers `notifier` with the event loop. Subclasses must implement this method to tie a socket notifier into another event loop.

### registerTimer

    public abstract void registerTimer(int timerId,
                                       int interval,
                                       QObject object)

  Register a timer with the specified `timerId` and `interval` for the given `object`.

### registeredTimers

    public abstract java.util.List registeredTimers(QObject object)

  Returns a list of registered timers for `object`. The timer ID is the first member in each pair; the interval is the second.

### unregisterSocketNotifier

    public abstract void unregisterSocketNotifier(QSocketNotifier notifier)

  Unregisters `notifier` from the event dispatcher. Subclasses must reimplement this method to tie a socket notifier into another event loop. Reimplementations must call the base implementation.

### unregisterTimer

    public abstract boolean unregisterTimer(int timerId)

  Unregisters the timer with the given `timerId`. Returns true if successful; otherwise returns false.

See also:
  `registerTimer()`, and `unregisterTimers()`.

### unregisterTimers

    public abstract boolean unregisterTimers(QObject object)

  Unregisters all the timers associated with the given `object`. Returns true if all timers were successful removed; otherwise returns false.

See also:
  `unregisterTimer()`, and `registeredTimers()`.

### wakeUp

    public abstract void wakeUp()

  Wakes up the event loop.

See also:
  `awake()` .

### instance

    public static QAbstractEventDispatcher instance()

  Returns a pointer to the event dispatcher object for the specified `thread`. If `thread` is zero, the current thread is used. If no event dispatcher exists for the specified thread, this function returns 0.

  Note: If Qt is built without thread support, the `thread` argument is ignored.

### instance

    public static QAbstractEventDispatcher instance(java.lang.Thread thread)

  Returns a pointer to the event dispatcher object for the specified `thread`. If `thread` is zero, the current thread is used. If no event dispatcher exists for the specified thread, this function returns 0.

  Note: If Qt is built without thread support, the `thread` argument is ignored.

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