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java.lang.Objectcom.trolltech.qt.QSignalEmitter
com.trolltech.qt.QtJambiObject
com.trolltech.qt.core.QObject
com.trolltech.qt.core.QAbstractEventDispatcher
public abstract class QAbstractEventDispatcher
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.
Nested Class Summary |
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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> |
Field Summary | |
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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. |
Constructor Summary | |
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QAbstractEventDispatcher()
Equivalent to QAbstractEventDispatcher(0). |
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QAbstractEventDispatcher(QObject parent)
Constructs a new event dispatcher with the given parent. |
Method Summary | |
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void |
closingDown()
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abstract void |
flush()
Flushes the event queue. |
static QAbstractEventDispatcher |
fromNativePointer(QNativePointer nativePointer)
This function returns the QAbstractEventDispatcher instance pointed to by nativePointer |
abstract boolean |
hasPendingEvents()
Returns true if there is an event waiting; otherwise returns false. |
static QAbstractEventDispatcher |
instance()
Equivalent to instance(0). |
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.e. the event dispatcher will return from processEvents as soon as possible. |
abstract boolean |
processEvents(QEventLoop.ProcessEventsFlags flags)
Processes pending events that match flags until there are no more events to process. |
abstract java.util.List<QPair<java.lang.Integer,java.lang.Integer>> |
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. |
void |
startingUp()
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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 |
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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 |
Field Detail |
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public final QSignalEmitter.Signal0 aboutToBlock
This signal is emitted before the event loop calls a function that could block.
public final QSignalEmitter.Signal0 awake
This signal is emitted after the event loop returns from a function that could block.
Constructor Detail |
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public QAbstractEventDispatcher()
Equivalent to QAbstractEventDispatcher(0).
public QAbstractEventDispatcher(QObject parent)
Constructs a new event dispatcher with the given parent.
Method Detail |
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public final int registerTimer(int interval, QObject object)
Registers a timer with the specified interval for the given object.
public void closingDown()
public abstract void flush()
Flushes the event queue. This normally returns almost immediately. Does nothing on platforms other than X11.
public abstract boolean hasPendingEvents()
Returns true if there is an event waiting; otherwise returns false.
public abstract void interrupt()
Interrupts event dispatching; i.e. the event dispatcher will return from processEvents as soon as possible.
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 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.
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.
public abstract void registerTimer(int timerId, int interval, QObject object)
Register a timer with the specified timerId and interval for the given object.
public abstract java.util.List<QPair<java.lang.Integer,java.lang.Integer>> 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.
public void startingUp()
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.
public abstract boolean unregisterTimer(int timerId)
Unregisters the timer with the given timerId. Returns true if successful; otherwise returns false.
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.
public abstract void wakeUp()
Wakes up the event loop.
public static QAbstractEventDispatcher instance()
Equivalent to instance(0).
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.
public static QAbstractEventDispatcher fromNativePointer(QNativePointer nativePointer)
nativePointer
- the QNativePointer of which object should be returned.
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