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41
42 #include "qcoreevent.h"
43 #include "qcoreapplication.h"
44 #include "qcoreapplication_p.h"
45
46 #include "qmutex.h"
47 #include "qset.h"
48
49 QT_BEGIN_NAMESPACE
50
51 /*!
52 \class QEvent
53 \brief The QEvent class is the base class of all
54 event classes. Event objects contain event parameters.
55
56 \ingroup events
57
58 Qt's main event loop (QCoreApplication::exec()) fetches native
59 window system events from the event queue, translates them into
60 QEvents, and sends the translated events to \l{QObject}s.
61
62 In general, events come from the underlying window system
63 (spontaneous() returns true), but it is also possible to manually
64 send events using QCoreApplication::sendEvent() and
65 QCoreApplication::postEvent() (spontaneous() returns false).
66
67 QObjects receive events by having their QObject::event() function
68 called. The function can be reimplemented in subclasses to
69 customize event handling and add additional event types;
70 QWidget::event() is a notable example. By default, events are
71 dispatched to event handlers like QObject::timerEvent() and
72 QWidget::mouseMoveEvent(). QObject::installEventFilter() allows an
73 object to intercept events destined for another object.
74
75 The basic QEvent contains only an event type parameter and an
76 "accept" flag. The accept flag set with accept(), and cleared
77 with ignore(). It is set by default, but don't rely on this as
78 subclasses may choose to clear it in their constructor.
79
80 Subclasses of QEvent contain additional parameters that describe
81 the particular event.
82
83 \sa QObject::event(), QObject::installEventFilter(),
84 QWidget::event(), QCoreApplication::sendEvent(),
85 QCoreApplication::postEvent(), QCoreApplication::processEvents()
86 */
87
88
89 /*!
90 \enum QEvent::Type
91
92 This enum type defines the valid event types in Qt. The event
93 types and the specialized classes for each type are as follows:
94
95 \value None Not an event.
96 \value AccessibilityDescription Used to query accessibility description texts (QAccessibleEvent).
97 \value AccessibilityHelp Used to query accessibility help texts (QAccessibleEvent).
98 \value AccessibilityPrepare Accessibility information is requested.
99 \value ActionAdded A new action has been added (QActionEvent).
100 \value ActionChanged An action has been changed (QActionEvent).
101 \value ActionRemoved An action has been removed (QActionEvent).
102 \value ActivationChange A widget's top-level window activation state has changed.
103 \value ApplicationActivate The application has been made available to the user.
104 \value ApplicationActivated This enum has been deprecated. Use ApplicationActivate instead.
105 \value ApplicationDeactivate The application has been suspended, and is unavailable to the user.
106 \value ApplicationFontChange The default application font has changed.
107 \value ApplicationLayoutDirectionChange The default application layout direction has changed.
108 \value ApplicationPaletteChange The default application palette has changed.
109 \value ApplicationWindowIconChange The application's icon has changed.
110 \value ChildAdded An object gets a child (QChildEvent).
111 \value ChildInserted An object gets a child (QChildEvent). Qt3Support only, use ChildAdded instead.
112 \value ChildPolished A widget child gets polished (QChildEvent).
113 \value ChildRemoved An object loses a child (QChildEvent).
114 \value Clipboard The clipboard contents have changed (QClipboardEvent).
115 \value Close Widget was closed (QCloseEvent).
116 \value CloseSoftwareInputPanel A widget wants to close the software input panel (SIP).
117 \value ContentsRectChange The margins of the widget's content rect changed.
118 \value ContextMenu Context popup menu (QContextMenuEvent).
119 \value CursorChange The widget's cursor has changed.
120 \value DeferredDelete The object will be deleted after it has cleaned up.
121 \value DragEnter The cursor enters a widget during a drag and drop operation (QDragEnterEvent).
122 \value DragLeave The cursor leaves a widget during a drag and drop operation (QDragLeaveEvent).
123 \value DragMove A drag and drop operation is in progress (QDragMoveEvent).
124 \value Drop A drag and drop operation is completed (QDropEvent).
125 \value EnabledChange Widget's enabled state has changed.
126 \value Enter Mouse enters widget's boundaries.
127 \value EnterEditFocus An editor widget gains focus for editing.
128 \value EnterWhatsThisMode Send to toplevel widgets when the application enters "What's This?" mode.
129 \value FileOpen File open request (QFileOpenEvent).
130 \value FocusIn Widget gains keyboard focus (QFocusEvent).
131 \value FocusOut Widget loses keyboard focus (QFocusEvent).
132 \value FontChange Widget's font has changed.
133 \value GrabKeyboard Item gains keyboard grab (QGraphicsItem only).
134 \value GrabMouse Item gains mouse grab (QGraphicsItem only).
135 \value GraphicsSceneContextMenu Context popup menu over a graphics scene (QGraphicsSceneContextMenuEvent).
136 \value GraphicsSceneDragEnter The cursor enters a graphics scene during a drag and drop operation (QGraphicsSceneDragDropEvent).
137 \value GraphicsSceneDragLeave The cursor leaves a graphics scene during a drag and drop operation (QGraphicsSceneDragDropEvent).
138 \value GraphicsSceneDragMove A drag and drop operation is in progress over a scene (QGraphicsSceneDragDropEvent).
139 \value GraphicsSceneDrop A drag and drop operation is completed over a scene (QGraphicsSceneDragDropEvent).
140 \value GraphicsSceneHelp The user requests help for a graphics scene (QHelpEvent).
141 \value GraphicsSceneHoverEnter The mouse cursor enters a hover item in a graphics scene (QGraphicsSceneHoverEvent).
142 \value GraphicsSceneHoverLeave The mouse cursor leaves a hover item in a graphics scene (QGraphicsSceneHoverEvent).
143 \value GraphicsSceneHoverMove The mouse cursor moves inside a hover item in a graphics scene (QGraphicsSceneHoverEvent).
144 \value GraphicsSceneMouseDoubleClick Mouse press again (double click) in a graphics scene (QGraphicsSceneMouseEvent).
145 \value GraphicsSceneMouseMove Move mouse in a graphics scene (QGraphicsSceneMouseEvent).
146 \value GraphicsSceneMousePress Mouse press in a graphics scene (QGraphicsSceneMouseEvent).
147 \value GraphicsSceneMouseRelease Mouse release in a graphics scene (QGraphicsSceneMouseEvent).
148 \value GraphicsSceneMove Widget was moved (QGraphicsSceneMoveEvent).
149 \value GraphicsSceneResize Widget was resized (QGraphicsSceneResizeEvent).
150 \value GraphicsSceneWheel Mouse wheel rolled in a graphics scene (QGraphicsSceneWheelEvent).
151 \value Hide Widget was hidden (QHideEvent).
152 \value HideToParent A child widget has been hidden.
153 \value HoverEnter The mouse cursor enters a hover widget (QHoverEvent).
154 \value HoverLeave The mouse cursor leaves a hover widget (QHoverEvent).
155 \value HoverMove The mouse cursor moves inside a hover widget (QHoverEvent).
156 \value IconDrag The main icon of a window has been dragged away (QIconDragEvent).
157 \value IconTextChange Widget's icon text has been changed.
158 \value InputMethod An input method is being used (QInputMethodEvent).
159 \value KeyPress Key press (QKeyEvent).
160 \value KeyRelease Key release (QKeyEvent).
161 \value LanguageChange The application translation changed.
162 \value LayoutDirectionChange The direction of layouts changed.
163 \value LayoutRequest Widget layout needs to be redone.
164 \value Leave Mouse leaves widget's boundaries.
165 \value LeaveEditFocus An editor widget loses focus for editing.
166 \value LeaveWhatsThisMode Send to toplevel widgets when the application leaves "What's This?" mode.
167 \value LocaleChange The system locale has changed.
168 \value NonClientAreaMouseButtonDblClick A mouse double click occurred outside the client area.
169 \value NonClientAreaMouseButtonPress A mouse button press occurred outside the client area.
170 \value NonClientAreaMouseButtonRelease A mouse button release occurred outside the client area.
171 \value NonClientAreaMouseMove A mouse move occurred outside the client area.
172 \value MacSizeChange The user changed his widget sizes (Mac OS X only).
173 \value MenubarUpdated The window's menu bar has been updated.
174 \value MetaCall An asynchronous method invocation via QMetaObject::invokeMethod().
175 \value ModifiedChange Widgets modification state has been changed.
176 \value MouseButtonDblClick Mouse press again (QMouseEvent).
177 \value MouseButtonPress Mouse press (QMouseEvent).
178 \value MouseButtonRelease Mouse release (QMouseEvent).
179 \value MouseMove Mouse move (QMouseEvent).
180 \value MouseTrackingChange The mouse tracking state has changed.
181 \value Move Widget's position changed (QMoveEvent).
182 \value Paint Screen update necessary (QPaintEvent).
183 \value PaletteChange Palette of the widget changed.
184 \value ParentAboutToChange The widget parent is about to change.
185 \value ParentChange The widget parent has changed.
186 \value PlatformPanel A platform specific panel has been requested.
187 \value Polish The widget is polished.
188 \value PolishRequest The widget should be polished.
189 \value QueryWhatsThis The widget should accept the event if it has "What's This?" help.
190 \value RequestSoftwareInputPanel A widget wants to open a software input panel (SIP).
191 \value Resize Widget's size changed (QResizeEvent).
192 \value Shortcut Key press in child for shortcut key handling (QShortcutEvent).
193 \value ShortcutOverride Key press in child, for overriding shortcut key handling (QKeyEvent).
194 \value Show Widget was shown on screen (QShowEvent).
195 \value ShowToParent A child widget has been shown.
196 \value SockAct Socket activated, used to implement QSocketNotifier.
197 \value StateMachineSignal A signal delivered to a state machine (QStateMachine::SignalEvent).
198 \value StateMachineWrapped The event is a wrapper for, i.e., contains, another event (QStateMachine::WrappedEvent).
199 \value StatusTip A status tip is requested (QStatusTipEvent).
200 \value StyleChange Widget's style has been changed.
201 \value TabletMove Wacom tablet move (QTabletEvent).
202 \value TabletPress Wacom tablet press (QTabletEvent).
203 \value TabletRelease Wacom tablet release (QTabletEvent).
204 \value OkRequest Ok button in decoration pressed. Supported only for Windows CE.
205 \value TabletEnterProximity Wacom tablet enter proximity event (QTabletEvent), sent to QApplication.
206 \value TabletLeaveProximity Wacom tablet leave proximity event (QTabletEvent), sent to QApplication.
207 \value Timer Regular timer events (QTimerEvent).
208 \value ToolBarChange The toolbar button is toggled on Mac OS X.
209 \value ToolTip A tooltip was requested (QHelpEvent).
210 \value ToolTipChange The widget's tooltip has changed.
211 \value UngrabKeyboard Item loses keyboard grab (QGraphicsItem only).
212 \value UngrabMouse Item loses mouse grab (QGraphicsItem only).
213 \value UpdateLater The widget should be queued to be repainted at a later time.
214 \value UpdateRequest The widget should be repainted.
215 \value WhatsThis The widget should reveal "What's This?" help (QHelpEvent).
216 \value WhatsThisClicked A link in a widget's "What's This?" help was clicked.
217 \value Wheel Mouse wheel rolled (QWheelEvent).
218 \value WinEventAct A Windows-specific activation event has occurred.
219 \value WindowActivate Window was activated.
220 \value WindowBlocked The window is blocked by a modal dialog.
221 \value WindowDeactivate Window was deactivated.
222 \value WindowIconChange The window's icon has changed.
223 \value WindowStateChange The \l{QWidget::windowState()}{window's state} (minimized, maximized or full-screen) has changed (QWindowStateChangeEvent).
224 \value WindowTitleChange The window title has changed.
225 \value WindowUnblocked The window is unblocked after a modal dialog exited.
226 \value ZOrderChange The widget's z-order has changed. This event is never sent to top level windows.
227 \value KeyboardLayoutChange The keyboard layout has changed.
228 \value DynamicPropertyChange A dynamic property was added, changed or removed from the object.
229 \value TouchBegin Beginning of a sequence of touch-screen and/or track-pad events (QTouchEvent)
230 \value TouchUpdate Touch-screen event (QTouchEvent)
231 \value TouchEnd End of touch-event sequence (QTouchEvent)
232 \value WinIdChange The window system identifer for this native widget has changed
233 \value Gesture A gesture was triggered (QGestureEvent)
234 \value GestureOverride A gesture override was triggered (QGestureEvent)
235
236 User events should have values between \c User and \c{MaxUser}:
237
238 \value User User-defined event.
239 \value MaxUser Last user event ID.
240
241 For convenience, you can use the registerEventType() function to
242 register and reserve a custom event type for your
243 application. Doing so will allow you to avoid accidentally
244 re-using a custom event type already in use elsewhere in your
245 application.
246
247 \omitvalue Accel
248 \omitvalue AccelAvailable
249 \omitvalue AccelOverride
250 \omitvalue AcceptDropsChange
251 \omitvalue ActivateControl
252 \omitvalue CaptionChange
253 \omitvalue ChildInsertedRequest
254 \omitvalue ChildInserted
255 \omitvalue Create
256 \omitvalue DeactivateControl
257 \omitvalue Destroy
258 \omitvalue DragResponse
259 \omitvalue EmbeddingControl
260 \omitvalue HelpRequest
261 \omitvalue IconChange
262 \omitvalue LayoutHint
263 \omitvalue Quit
264 \omitvalue Reparent
265 \omitvalue ShowWindowRequest
266 \omitvalue Speech
267 \omitvalue Style
268 \omitvalue ThreadChange
269 \omitvalue ZeroTimerEvent
270 \omitvalue ApplicationActivated
271 \omitvalue ApplicationDeactivated
272 \omitvalue MacGLWindowChange
273 \omitvalue MacGLClearDrawable
274 \omitvalue NetworkReplyUpdated
275 \omitvalue FutureCallOut
276 \omitvalue UpdateSoftKeys
277 \omitvalue NativeGesture
278 */
279
280 /*!
281 Contructs an event object of type \a type.
282 */
QEvent(Type type)283 QEvent::QEvent(Type type)
284 : d(0), t(type), posted(false), spont(false), m_accept(true)
285 {}
286
287 /*!
288 Destroys the event. If it was \link
289 QCoreApplication::postEvent() posted \endlink,
290 it will be removed from the list of events to be posted.
291 */
292
~QEvent()293 QEvent::~QEvent()
294 {
295 if (posted && QCoreApplication::instance())
296 QCoreApplicationPrivate::removePostedEvent(this);
297 }
298
299
300 /*!
301 \property QEvent::accepted
302 the accept flag of the event object
303
304 Setting the accept parameter indicates that the event receiver
305 wants the event. Unwanted events might be propagated to the parent
306 widget. By default, isAccepted() is set to true, but don't rely on
307 this as subclasses may choose to clear it in their constructor.
308
309 For convenience, the accept flag can also be set with accept(),
310 and cleared with ignore().
311 */
312
313 /*!
314 \fn void QEvent::accept()
315
316 Sets the accept flag of the event object, the equivalent of
317 calling setAccepted(true).
318
319 Setting the accept parameter indicates that the event receiver
320 wants the event. Unwanted events might be propagated to the parent
321 widget.
322
323 \sa ignore()
324 */
325
326
327 /*!
328 \fn void QEvent::ignore()
329
330 Clears the accept flag parameter of the event object, the
331 equivalent of calling setAccepted(false).
332
333 Clearing the accept parameter indicates that the event receiver
334 does not want the event. Unwanted events might be propagated to the
335 parent widget.
336
337 \sa accept()
338 */
339
340
341 /*!
342 \fn QEvent::Type QEvent::type() const
343
344 Returns the event type.
345 */
346
347 /*!
348 \fn bool QEvent::spontaneous() const
349
350 Returns true if the event originated outside the application (a
351 system event); otherwise returns false.
352
353 The return value of this function is not defined for paint events.
354 */
355
356 class QEventUserEventRegistration
357 {
358 public:
359 QMutex mutex;
360 QSet<int> set;
361 };
Q_GLOBAL_STATIC(QEventUserEventRegistration,userEventRegistrationHelper)362 Q_GLOBAL_STATIC(QEventUserEventRegistration, userEventRegistrationHelper)
363
364 /*!
365 \since 4.4
366 \threadsafe
367
368 Registers and returns a custom event type. The \a hint provided
369 will be used if it is available, otherwise it will return a value
370 between QEvent::User and QEvent::MaxUser that has not yet been
371 registered. The \a hint is ignored if its value is not between
372 QEvent::User and QEvent::MaxUser.
373 */
374 int QEvent::registerEventType(int hint)
375 {
376 QEventUserEventRegistration *userEventRegistration
377 = userEventRegistrationHelper();
378 if (!userEventRegistration)
379 return -1;
380
381 QMutexLocker locker(&userEventRegistration->mutex);
382
383 // if the type hint hasn't been registered yet, take it
384 if (hint >= QEvent::User && hint <= QEvent::MaxUser && !userEventRegistration->set.contains(hint)) {
385 userEventRegistration->set.insert(hint);
386 return hint;
387 }
388
389 // find a free event type, starting at MaxUser and decreasing
390 int id = QEvent::MaxUser;
391 while (userEventRegistration->set.contains(id) && id >= QEvent::User)
392 --id;
393 if (id >= QEvent::User) {
394 userEventRegistration->set.insert(id);
395 return id;
396 }
397 return -1;
398 }
399
400 /*!
401 \class QTimerEvent
402 \brief The QTimerEvent class contains parameters that describe a
403 timer event.
404
405 \ingroup events
406
407 Timer events are sent at regular intervals to objects that have
408 started one or more timers. Each timer has a unique identifier. A
409 timer is started with QObject::startTimer().
410
411 The QTimer class provides a high-level programming interface that
412 uses signals instead of events. It also provides single-shot timers.
413
414 The event handler QObject::timerEvent() receives timer events.
415
416 \sa QTimer, QObject::timerEvent(), QObject::startTimer(),
417 QObject::killTimer()
418 */
419
420 /*!
421 Constructs a timer event object with the timer identifier set to
422 \a timerId.
423 */
QTimerEvent(int timerId)424 QTimerEvent::QTimerEvent(int timerId)
425 : QEvent(Timer), id(timerId)
426 {}
427
428 /*! \internal
429 */
~QTimerEvent()430 QTimerEvent::~QTimerEvent()
431 {
432 }
433
434 /*!
435 \fn int QTimerEvent::timerId() const
436
437 Returns the unique timer identifier, which is the same identifier
438 as returned from QObject::startTimer().
439 */
440
441 /*!
442 \class QChildEvent
443 \brief The QChildEvent class contains event parameters for child object
444 events.
445
446 \ingroup events
447
448 Child events are sent immediately to objects when children are
449 added or removed.
450
451 In both cases you can only rely on the child being a QObject (or,
452 if QObject::isWidgetType() returns true, a QWidget). This is
453 because in the QEvent::ChildAdded case the child is not yet fully
454 constructed; in the QEvent::ChildRemoved case it might have
455 already been destructed.
456
457 The handler for these events is QObject::childEvent().
458 */
459
460 /*!
461 Constructs a child event object of a particular \a type for the
462 \a child.
463
464 \a type can be QEvent::ChildAdded, QEvent::ChildRemoved,
465 QEvent::ChildPolished, or QEvent::ChildRemoved.
466
467 \sa child()
468 */
QChildEvent(Type type,QObject * child)469 QChildEvent::QChildEvent(Type type, QObject *child)
470 : QEvent(type), c(child)
471 {}
472
473 /*! \internal
474 */
~QChildEvent()475 QChildEvent::~QChildEvent()
476 {
477 }
478
479 /*!
480 \fn QObject *QChildEvent::child() const
481
482 Returns the child object that was added or removed.
483 */
484
485 /*!
486 \fn bool QChildEvent::added() const
487
488 Returns true if type() is QEvent::ChildAdded; otherwise returns
489 false.
490 */
491
492 /*!
493 \fn bool QChildEvent::removed() const
494
495 Returns true if type() is QEvent::ChildRemoved; otherwise returns
496 false.
497 */
498
499 /*!
500 \fn bool QChildEvent::polished() const
501
502 Returns true if type() is QEvent::ChildPolished; otherwise returns
503 false.
504 */
505
506 /*!
507 \class QCustomEvent
508 \brief The QCustomEvent class provides support for custom events.
509
510 \compat
511
512 QCustomEvent has a \c{void *} that can be used to store custom
513 data.
514
515 In Qt 3, QObject::customEvent() took a QCustomEvent pointer. We
516 found out that this approach was unsatisfactory, because
517 there was often no safe way of deleting the data held in the
518 \c{void *}.
519
520 In Qt 4, QObject::customEvent() takes a plain QEvent pointer.
521 You can add custom data by subclassing.
522
523 \sa QObject::customEvent(), QCoreApplication::notify()
524 */
525
526 /*!
527 \fn QCustomEvent::QCustomEvent(int type, void *data)
528
529 Constructs a custom event object with the event \a type and a
530 pointer to \a data. The value of \a type must be at least as
531 large as QEvent::User. By default, the data pointer is set to 0.
532 */
533 #ifdef QT3_SUPPORT
QCustomEvent(int type,void * data)534 QCustomEvent::QCustomEvent(int type, void *data)
535 : QEvent(static_cast<Type>(type))
536 {
537 d = reinterpret_cast<QEventPrivate *>(data);
538 }
539
540 /*! \internal
541 */
~QCustomEvent()542 QCustomEvent::~QCustomEvent()
543 {
544 }
545 #endif
546 /*!
547 \fn void QCustomEvent::setData(void *data)
548
549 \compat
550
551 Sets the generic data pointer to \a data.
552
553 \sa data()
554 */
555
556 /*!
557 \fn void *QCustomEvent::data() const
558
559 \compat
560
561 Returns a pointer to the generic event data.
562
563 \sa setData()
564 */
565
566 /*!
567 \fn bool QChildEvent::inserted() const
568
569 \compat
570
571 A child has been inserted if the event's type() is ChildInserted.
572 */
573
574 /*!
575 \class QDynamicPropertyChangeEvent
576 \since 4.2
577 \brief The QDynamicPropertyChangeEvent class contains event parameters for dynamic
578 property change events.
579
580 \ingroup events
581
582 Dynamic property change events are sent to objects when properties are
583 dynamically added, changed or removed using QObject::setProperty().
584 */
585
586 /*!
587 Constructs a dynamic property change event object with the property name set to
588 \a name.
589 */
QDynamicPropertyChangeEvent(const QByteArray & name)590 QDynamicPropertyChangeEvent::QDynamicPropertyChangeEvent(const QByteArray &name)
591 : QEvent(QEvent::DynamicPropertyChange), n(name)
592 {
593 }
594
595 /*!
596 \internal
597 */
~QDynamicPropertyChangeEvent()598 QDynamicPropertyChangeEvent::~QDynamicPropertyChangeEvent()
599 {
600 }
601
602 /*!
603 \fn QByteArray QDynamicPropertyChangeEvent::propertyName() const
604
605 Returns the name of the dynamic property that was added, changed or
606 removed.
607
608 \sa QObject::setProperty(), QObject::dynamicPropertyNames()
609 */
610
611 QT_END_NAMESPACE
612