1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
|
/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qcoreevent.h"
#include "qcoreapplication.h"
#include "qcoreapplication_p.h"
#include "qmutex.h"
#include "qset.h"
QT_BEGIN_NAMESPACE
/*!
\class QEvent
\brief The QEvent class is the base class of all
event classes. Event objects contain event parameters.
\ingroup events
Qt's main event loop (QCoreApplication::exec()) fetches native
window system events from the event queue, translates them into
QEvents, and sends the translated events to \l{QObject}s.
In general, events come from the underlying window system
(spontaneous() returns true), but it is also possible to manually
send events using QCoreApplication::sendEvent() and
QCoreApplication::postEvent() (spontaneous() returns false).
QObjects receive events by having their QObject::event() function
called. The function can be reimplemented in subclasses to
customize event handling and add additional event types;
QWidget::event() is a notable example. By default, events are
dispatched to event handlers like QObject::timerEvent() and
QWidget::mouseMoveEvent(). QObject::installEventFilter() allows an
object to intercept events destined for another object.
The basic QEvent contains only an event type parameter and an
"accept" flag. The accept flag set with accept(), and cleared
with ignore(). It is set by default, but don't rely on this as
subclasses may choose to clear it in their constructor.
Subclasses of QEvent contain additional parameters that describe
the particular event.
\sa QObject::event(), QObject::installEventFilter(),
QWidget::event(), QCoreApplication::sendEvent(),
QCoreApplication::postEvent(), QCoreApplication::processEvents()
*/
/*!
\enum QEvent::Type
This enum type defines the valid event types in Qt. The event
types and the specialized classes for each type are as follows:
\value None Not an event.
\value AccessibilityDescription Used to query accessibility description texts (QAccessibleEvent).
\value AccessibilityHelp Used to query accessibility help texts (QAccessibleEvent).
\value AccessibilityPrepare Accessibility information is requested.
\value ActionAdded A new action has been added (QActionEvent).
\value ActionChanged An action has been changed (QActionEvent).
\value ActionRemoved An action has been removed (QActionEvent).
\value ActivationChange A widget's top-level window activation state has changed.
\value ApplicationActivate The application has been made available to the user.
\value ApplicationActivated This enum has been deprecated. Use ApplicationActivate instead.
\value ApplicationDeactivate The application has been suspended, and is unavailable to the user.
\value ApplicationFontChange The default application font has changed.
\value ApplicationLayoutDirectionChange The default application layout direction has changed.
\value ApplicationPaletteChange The default application palette has changed.
\value ApplicationWindowIconChange The application's icon has changed.
\value ChildAdded An object gets a child (QChildEvent).
\value ChildInserted An object gets a child (QChildEvent). Qt3Support only, use ChildAdded instead.
\value ChildPolished A widget child gets polished (QChildEvent).
\value ChildRemoved An object loses a child (QChildEvent).
\value Clipboard The clipboard contents have changed (QClipboardEvent).
\value Close Widget was closed (QCloseEvent).
\value CloseSoftwareInputPanel A widget wants to close the software input panel (SIP).
\value ContentsRectChange The margins of the widget's content rect changed.
\value ContextMenu Context popup menu (QContextMenuEvent).
\value CursorChange The widget's cursor has changed.
\value DeferredDelete The object will be deleted after it has cleaned up.
\value DragEnter The cursor enters a widget during a drag and drop operation (QDragEnterEvent).
\value DragLeave The cursor leaves a widget during a drag and drop operation (QDragLeaveEvent).
\value DragMove A drag and drop operation is in progress (QDragMoveEvent).
\value Drop A drag and drop operation is completed (QDropEvent).
\value EnabledChange Widget's enabled state has changed.
\value Enter Mouse enters widget's boundaries.
\value EnterEditFocus An editor widget gains focus for editing.
\value EnterWhatsThisMode Send to toplevel widgets when the application enters "What's This?" mode.
\value FileOpen File open request (QFileOpenEvent).
\value FocusIn Widget gains keyboard focus (QFocusEvent).
\value FocusOut Widget loses keyboard focus (QFocusEvent).
\value FontChange Widget's font has changed.
\value GrabKeyboard Item gains keyboard grab (QGraphicsItem only).
\value GrabMouse Item gains mouse grab (QGraphicsItem only).
\value GraphicsSceneContextMenu Context popup menu over a graphics scene (QGraphicsSceneContextMenuEvent).
\value GraphicsSceneDragEnter The cursor enters a graphics scene during a drag and drop operation (QGraphicsSceneDragDropEvent).
\value GraphicsSceneDragLeave The cursor leaves a graphics scene during a drag and drop operation (QGraphicsSceneDragDropEvent).
\value GraphicsSceneDragMove A drag and drop operation is in progress over a scene (QGraphicsSceneDragDropEvent).
\value GraphicsSceneDrop A drag and drop operation is completed over a scene (QGraphicsSceneDragDropEvent).
\value GraphicsSceneHelp The user requests help for a graphics scene (QHelpEvent).
\value GraphicsSceneHoverEnter The mouse cursor enters a hover item in a graphics scene (QGraphicsSceneHoverEvent).
\value GraphicsSceneHoverLeave The mouse cursor leaves a hover item in a graphics scene (QGraphicsSceneHoverEvent).
\value GraphicsSceneHoverMove The mouse cursor moves inside a hover item in a graphics scene (QGraphicsSceneHoverEvent).
\value GraphicsSceneMouseDoubleClick Mouse press again (double click) in a graphics scene (QGraphicsSceneMouseEvent).
\value GraphicsSceneMouseMove Move mouse in a graphics scene (QGraphicsSceneMouseEvent).
\value GraphicsSceneMousePress Mouse press in a graphics scene (QGraphicsSceneMouseEvent).
\value GraphicsSceneMouseRelease Mouse release in a graphics scene (QGraphicsSceneMouseEvent).
\value GraphicsSceneMove Widget was moved (QGraphicsSceneMoveEvent).
\value GraphicsSceneResize Widget was resized (QGraphicsSceneResizeEvent).
\value GraphicsSceneWheel Mouse wheel rolled in a graphics scene (QGraphicsSceneWheelEvent).
\value Hide Widget was hidden (QHideEvent).
\value HideToParent A child widget has been hidden.
\value HoverEnter The mouse cursor enters a hover widget (QHoverEvent).
\value HoverLeave The mouse cursor leaves a hover widget (QHoverEvent).
\value HoverMove The mouse cursor moves inside a hover widget (QHoverEvent).
\value IconDrag The main icon of a window has been dragged away (QIconDragEvent).
\value IconTextChange Widget's icon text has been changed.
\value InputMethod An input method is being used (QInputMethodEvent).
\value KeyPress Key press (QKeyEvent).
\value KeyRelease Key release (QKeyEvent).
\value LanguageChange The application translation changed.
\value LayoutDirectionChange The direction of layouts changed.
\value LayoutRequest Widget layout needs to be redone.
\value Leave Mouse leaves widget's boundaries.
\value LeaveEditFocus An editor widget loses focus for editing.
\value LeaveWhatsThisMode Send to toplevel widgets when the application leaves "What's This?" mode.
\value LocaleChange The system locale has changed.
\value NonClientAreaMouseButtonDblClick A mouse double click occurred outside the client area.
\value NonClientAreaMouseButtonPress A mouse button press occurred outside the client area.
\value NonClientAreaMouseButtonRelease A mouse button release occurred outside the client area.
\value NonClientAreaMouseMove A mouse move occurred outside the client area.
\value MacSizeChange The user changed his widget sizes (Mac OS X only).
\value MenubarUpdated The window's menu bar has been updated.
\value MetaCall An asynchronous method invocation via QMetaObject::invokeMethod().
\value ModifiedChange Widgets modification state has been changed.
\value MouseButtonDblClick Mouse press again (QMouseEvent).
\value MouseButtonPress Mouse press (QMouseEvent).
\value MouseButtonRelease Mouse release (QMouseEvent).
\value MouseMove Mouse move (QMouseEvent).
\value MouseTrackingChange The mouse tracking state has changed.
\value Move Widget's position changed (QMoveEvent).
\value Paint Screen update necessary (QPaintEvent).
\value PaletteChange Palette of the widget changed.
\value ParentAboutToChange The widget parent is about to change.
\value ParentChange The widget parent has changed.
\value PlatformPanel A platform specific panel has been requested.
\value Polish The widget is polished.
\value PolishRequest The widget should be polished.
\value QueryWhatsThis The widget should accept the event if it has "What's This?" help.
\value RequestSoftwareInputPanel A widget wants to open a software input panel (SIP).
\value Resize Widget's size changed (QResizeEvent).
\value Shortcut Key press in child for shortcut key handling (QShortcutEvent).
\value ShortcutOverride Key press in child, for overriding shortcut key handling (QKeyEvent).
\value Show Widget was shown on screen (QShowEvent).
\value ShowToParent A child widget has been shown.
\value SockAct Socket activated, used to implement QSocketNotifier.
\value StateMachineSignal A signal delivered to a state machine (QStateMachine::SignalEvent).
\value StateMachineWrapped The event is a wrapper for, i.e., contains, another event (QStateMachine::WrappedEvent).
\value StatusTip A status tip is requested (QStatusTipEvent).
\value StyleChange Widget's style has been changed.
\value TabletMove Wacom tablet move (QTabletEvent).
\value TabletPress Wacom tablet press (QTabletEvent).
\value TabletRelease Wacom tablet release (QTabletEvent).
\value OkRequest Ok button in decoration pressed. Supported only for Windows CE.
\value TabletEnterProximity Wacom tablet enter proximity event (QTabletEvent), sent to QApplication.
\value TabletLeaveProximity Wacom tablet leave proximity event (QTabletEvent), sent to QApplication.
\value Timer Regular timer events (QTimerEvent).
\value ToolBarChange The toolbar button is toggled on Mac OS X.
\value ToolTip A tooltip was requested (QHelpEvent).
\value ToolTipChange The widget's tooltip has changed.
\value UngrabKeyboard Item loses keyboard grab (QGraphicsItem only).
\value UngrabMouse Item loses mouse grab (QGraphicsItem only).
\value UpdateLater The widget should be queued to be repainted at a later time.
\value UpdateRequest The widget should be repainted.
\value WhatsThis The widget should reveal "What's This?" help (QHelpEvent).
\value WhatsThisClicked A link in a widget's "What's This?" help was clicked.
\value Wheel Mouse wheel rolled (QWheelEvent).
\value WinEventAct A Windows-specific activation event has occurred.
\value WindowActivate Window was activated.
\value WindowBlocked The window is blocked by a modal dialog.
\value WindowDeactivate Window was deactivated.
\value WindowIconChange The window's icon has changed.
\value WindowStateChange The \l{QWidget::windowState()}{window's state} (minimized, maximized or full-screen) has changed (QWindowStateChangeEvent).
\value WindowTitleChange The window title has changed.
\value WindowUnblocked The window is unblocked after a modal dialog exited.
\value ZOrderChange The widget's z-order has changed. This event is never sent to top level windows.
\value KeyboardLayoutChange The keyboard layout has changed.
\value DynamicPropertyChange A dynamic property was added, changed or removed from the object.
\value TouchBegin Beginning of a sequence of touch-screen and/or track-pad events (QTouchEvent)
\value TouchUpdate Touch-screen event (QTouchEvent)
\value TouchEnd End of touch-event sequence (QTouchEvent)
\value WinIdChange The window system identifer for this native widget has changed
\value Gesture A gesture was triggered (QGestureEvent)
\value GestureOverride A gesture override was triggered (QGestureEvent)
User events should have values between \c User and \c{MaxUser}:
\value User User-defined event.
\value MaxUser Last user event ID.
For convenience, you can use the registerEventType() function to
register and reserve a custom event type for your
application. Doing so will allow you to avoid accidentally
re-using a custom event type already in use elsewhere in your
application.
\omitvalue Accel
\omitvalue AccelAvailable
\omitvalue AccelOverride
\omitvalue AcceptDropsChange
\omitvalue ActivateControl
\omitvalue CaptionChange
\omitvalue ChildInsertedRequest
\omitvalue ChildInserted
\omitvalue Create
\omitvalue DeactivateControl
\omitvalue Destroy
\omitvalue DragResponse
\omitvalue EmbeddingControl
\omitvalue HelpRequest
\omitvalue IconChange
\omitvalue LayoutHint
\omitvalue Quit
\omitvalue Reparent
\omitvalue ShowWindowRequest
\omitvalue Speech
\omitvalue Style
\omitvalue ThreadChange
\omitvalue ZeroTimerEvent
\omitvalue ApplicationActivated
\omitvalue ApplicationDeactivated
\omitvalue MacGLWindowChange
\omitvalue MacGLClearDrawable
\omitvalue NetworkReplyUpdated
\omitvalue FutureCallOut
\omitvalue UpdateSoftKeys
\omitvalue NativeGesture
*/
/*!
Contructs an event object of type \a type.
*/
QEvent::QEvent(Type type)
: d(0), t(type), posted(false), spont(false), m_accept(true)
{}
/*!
Destroys the event. If it was \link
QCoreApplication::postEvent() posted \endlink,
it will be removed from the list of events to be posted.
*/
QEvent::~QEvent()
{
if (posted && QCoreApplication::instance())
QCoreApplicationPrivate::removePostedEvent(this);
}
/*!
\property QEvent::accepted
the accept flag of the event object
Setting the accept parameter indicates that the event receiver
wants the event. Unwanted events might be propagated to the parent
widget. By default, isAccepted() is set to true, but don't rely on
this as subclasses may choose to clear it in their constructor.
For convenience, the accept flag can also be set with accept(),
and cleared with ignore().
*/
/*!
\fn void QEvent::accept()
Sets the accept flag of the event object, the equivalent of
calling setAccepted(true).
Setting the accept parameter indicates that the event receiver
wants the event. Unwanted events might be propagated to the parent
widget.
\sa ignore()
*/
/*!
\fn void QEvent::ignore()
Clears the accept flag parameter of the event object, the
equivalent of calling setAccepted(false).
Clearing the accept parameter indicates that the event receiver
does not want the event. Unwanted events might be propagated to the
parent widget.
\sa accept()
*/
/*!
\fn QEvent::Type QEvent::type() const
Returns the event type.
*/
/*!
\fn bool QEvent::spontaneous() const
Returns true if the event originated outside the application (a
system event); otherwise returns false.
The return value of this function is not defined for paint events.
*/
class QEventUserEventRegistration
{
public:
QMutex mutex;
QSet<int> set;
};
Q_GLOBAL_STATIC(QEventUserEventRegistration, userEventRegistrationHelper)
/*!
\since 4.4
\threadsafe
Registers and returns a custom event type. The \a hint provided
will be used if it is available, otherwise it will return a value
between QEvent::User and QEvent::MaxUser that has not yet been
registered. The \a hint is ignored if its value is not between
QEvent::User and QEvent::MaxUser.
*/
int QEvent::registerEventType(int hint)
{
QEventUserEventRegistration *userEventRegistration
= userEventRegistrationHelper();
if (!userEventRegistration)
return -1;
QMutexLocker locker(&userEventRegistration->mutex);
// if the type hint hasn't been registered yet, take it
if (hint >= QEvent::User && hint <= QEvent::MaxUser && !userEventRegistration->set.contains(hint)) {
userEventRegistration->set.insert(hint);
return hint;
}
// find a free event type, starting at MaxUser and decreasing
int id = QEvent::MaxUser;
while (userEventRegistration->set.contains(id) && id >= QEvent::User)
--id;
if (id >= QEvent::User) {
userEventRegistration->set.insert(id);
return id;
}
return -1;
}
/*!
\class QTimerEvent
\brief The QTimerEvent class contains parameters that describe a
timer event.
\ingroup events
Timer events are sent at regular intervals to objects that have
started one or more timers. Each timer has a unique identifier. A
timer is started with QObject::startTimer().
The QTimer class provides a high-level programming interface that
uses signals instead of events. It also provides single-shot timers.
The event handler QObject::timerEvent() receives timer events.
\sa QTimer, QObject::timerEvent(), QObject::startTimer(),
QObject::killTimer()
*/
/*!
Constructs a timer event object with the timer identifier set to
\a timerId.
*/
QTimerEvent::QTimerEvent(int timerId)
: QEvent(Timer), id(timerId)
{}
/*! \internal
*/
QTimerEvent::~QTimerEvent()
{
}
/*!
\fn int QTimerEvent::timerId() const
Returns the unique timer identifier, which is the same identifier
as returned from QObject::startTimer().
*/
/*!
\class QChildEvent
\brief The QChildEvent class contains event parameters for child object
events.
\ingroup events
Child events are sent immediately to objects when children are
added or removed.
In both cases you can only rely on the child being a QObject (or,
if QObject::isWidgetType() returns true, a QWidget). This is
because in the QEvent::ChildAdded case the child is not yet fully
constructed; in the QEvent::ChildRemoved case it might have
already been destructed.
The handler for these events is QObject::childEvent().
*/
/*!
Constructs a child event object of a particular \a type for the
\a child.
\a type can be QEvent::ChildAdded, QEvent::ChildRemoved,
QEvent::ChildPolished, or QEvent::ChildRemoved.
\sa child()
*/
QChildEvent::QChildEvent(Type type, QObject *child)
: QEvent(type), c(child)
{}
/*! \internal
*/
QChildEvent::~QChildEvent()
{
}
/*!
\fn QObject *QChildEvent::child() const
Returns the child object that was added or removed.
*/
/*!
\fn bool QChildEvent::added() const
Returns true if type() is QEvent::ChildAdded; otherwise returns
false.
*/
/*!
\fn bool QChildEvent::removed() const
Returns true if type() is QEvent::ChildRemoved; otherwise returns
false.
*/
/*!
\fn bool QChildEvent::polished() const
Returns true if type() is QEvent::ChildPolished; otherwise returns
false.
*/
/*!
\class QCustomEvent
\brief The QCustomEvent class provides support for custom events.
\compat
QCustomEvent has a \c{void *} that can be used to store custom
data.
In Qt 3, QObject::customEvent() took a QCustomEvent pointer. We
found out that this approach was unsatisfactory, because
there was often no safe way of deleting the data held in the
\c{void *}.
In Qt 4, QObject::customEvent() takes a plain QEvent pointer.
You can add custom data by subclassing.
\sa QObject::customEvent(), QCoreApplication::notify()
*/
/*!
\fn QCustomEvent::QCustomEvent(int type, void *data)
Constructs a custom event object with the event \a type and a
pointer to \a data. The value of \a type must be at least as
large as QEvent::User. By default, the data pointer is set to 0.
*/
#ifdef QT3_SUPPORT
QCustomEvent::QCustomEvent(int type, void *data)
: QEvent(static_cast<Type>(type))
{
d = reinterpret_cast<QEventPrivate *>(data);
}
/*! \internal
*/
QCustomEvent::~QCustomEvent()
{
}
#endif
/*!
\fn void QCustomEvent::setData(void *data)
\compat
Sets the generic data pointer to \a data.
\sa data()
*/
/*!
\fn void *QCustomEvent::data() const
\compat
Returns a pointer to the generic event data.
\sa setData()
*/
/*!
\fn bool QChildEvent::inserted() const
\compat
A child has been inserted if the event's type() is ChildInserted.
*/
/*!
\class QDynamicPropertyChangeEvent
\since 4.2
\brief The QDynamicPropertyChangeEvent class contains event parameters for dynamic
property change events.
\ingroup events
Dynamic property change events are sent to objects when properties are
dynamically added, changed or removed using QObject::setProperty().
*/
/*!
Constructs a dynamic property change event object with the property name set to
\a name.
*/
QDynamicPropertyChangeEvent::QDynamicPropertyChangeEvent(const QByteArray &name)
: QEvent(QEvent::DynamicPropertyChange), n(name)
{
}
/*!
\internal
*/
QDynamicPropertyChangeEvent::~QDynamicPropertyChangeEvent()
{
}
/*!
\fn QByteArray QDynamicPropertyChangeEvent::propertyName() const
Returns the name of the dynamic property that was added, changed or
removed.
\sa QObject::setProperty(), QObject::dynamicPropertyNames()
*/
QT_END_NAMESPACE
|