qevent(3qt)

1QEvent(3qt)                                                        QEvent(3qt)
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NAME

6       QEvent - The base class of all event classes. Event objects contain
7       event parameters
8

SYNOPSIS

10       #include <qevent.h>
11
12       Inherits Qt.
13
14       Inherited by QTimerEvent, QMouseEvent, QWheelEvent, QTabletEvent,
15       QKeyEvent, QFocusEvent, QPaintEvent, QMoveEvent, QResizeEvent,
16       QCloseEvent, QIconDragEvent, QShowEvent, QHideEvent, QContextMenuEvent,
17       QIMEvent, QDropEvent, QDragLeaveEvent, QChildEvent, and QCustomEvent.
18
19   Public Members
20       enum Type { None = 0, Timer = 1, MouseButtonPress = 2,
21           MouseButtonRelease = 3, MouseButtonDblClick = 4, MouseMove = 5,
22           KeyPress = 6, KeyRelease = 7, FocusIn = 8, FocusOut = 9, Enter =
23           10, Leave = 11, Paint = 12, Move = 13, Resize = 14, Create = 15,
24           Destroy = 16, Show = 17, Hide = 18, Close = 19, Quit = 20, Reparent
25           = 21, ShowMinimized = 22, ShowNormal = 23, WindowActivate = 24,
26           WindowDeactivate = 25, ShowToParent = 26, HideToParent = 27,
27           ShowMaximized = 28, ShowFullScreen = 29, Accel = 30, Wheel = 31,
28           AccelAvailable = 32, CaptionChange = 33, IconChange = 34,
29           ParentFontChange = 35, ApplicationFontChange = 36,
30           ParentPaletteChange = 37, ApplicationPaletteChange = 38,
31           PaletteChange = 39, Clipboard = 40, Speech = 42, SockAct = 50,
32           AccelOverride = 51, DeferredDelete = 52, DragEnter = 60, DragMove =
33           61, DragLeave = 62, Drop = 63, DragResponse = 64, ChildInserted =
34           70, ChildRemoved = 71, LayoutHint = 72, ShowWindowRequest = 73,
35           WindowBlocked = 74, WindowUnblocked = 75, ActivateControl = 80,
36           DeactivateControl = 81, ContextMenu = 82, IMStart = 83, IMCompose =
37           84, IMEnd = 85, Accessibility = 86, TabletMove = 87, LocaleChange =
38           88, LanguageChange = 89, LayoutDirectionChange = 90, Style = 91,
39           TabletPress = 92, TabletRelease = 93, OkRequest = 94, HelpRequest =
40           95, WindowStateChange = 96, IconDrag = 97, User = 1000, MaxUser =
41           65535 }
42       QEvent ( Type type )
43       virtual ~QEvent ()
44       Type type () const
45       bool spontaneous () const
46

DESCRIPTION

48       The QEvent class is the base class of all event classes. Event objects
49       contain event parameters.
50
51       Qt's main event loop (QApplication::exec()) fetches native window
52       system events from the event queue, translates them into QEvents and
53       sends the translated events to QObjects.
54
55       In general, events come from the underlying window system
56       (spontaneous() returns TRUE) but it is also possible to manually send
57       events using QApplication::sendEvent() and QApplication::postEvent()
58       (spontaneous() returns FALSE).
59
60       QObjects receive events by having their QObject::event() function
61       called. The function can be reimplemented in subclasses to customize
62       event handling and add additional event types; QWidget::event() is a
63       notable example. By default, events are dispatched to event handlers
64       like QObject::timerEvent() and QWidget::mouseMoveEvent().
65       QObject::installEventFilter() allows an object to intercept events
66       destined for another object.
67
68       The basic QEvent contains only an event type parameter. Subclasses of
69       QEvent contain additional parameters that describe the particular
70       event.
71
72       See also QObject::event(), QObject::installEventFilter(),
73       QWidget::event(), QApplication::sendEvent(), QApplication::postEvent(),
74       QApplication::processEvents(), Environment Classes, and Event Classes.
75
76   Member Type Documentation

QEvent::Type

78       This enum type defines the valid event types in Qt. The event types and
79       the specialized classes for each type are these:
80
81       QEvent::None - Not an event.
82
83       QEvent::Accessibility - Accessibility information is requested
84
85       QEvent::Timer - Regular timer events, QTimerEvent.
86
87       QEvent::MouseButtonPress - Mouse press, QMouseEvent.
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89       QEvent::MouseButtonRelease - Mouse release, QMouseEvent.
90
91       QEvent::MouseButtonDblClick - Mouse press again, QMouseEvent.
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93       QEvent::MouseMove - Mouse move, QMouseEvent.
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95       QEvent::KeyPress - Key press (including Shift, for example), QKeyEvent.
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97       QEvent::KeyRelease - Key release, QKeyEvent.
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99       QEvent::IMStart - The start of input method composition, QIMEvent.
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101       QEvent::IMCompose - Input method composition is taking place, QIMEvent.
102
103       QEvent::IMEnd - The end of input method composition, QIMEvent.
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105       QEvent::FocusIn - Widget gains keyboard focus, QFocusEvent.
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107       QEvent::FocusOut - Widget loses keyboard focus, QFocusEvent.
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109       QEvent::Enter - Mouse enters widget's boundaries.
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111       QEvent::Leave - Mouse leaves widget's boundaries.
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113       QEvent::Paint - Screen update necessary, QPaintEvent.
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115       QEvent::Move - Widget's position changed, QMoveEvent.
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117       QEvent::Resize - Widget's size changed, QResizeEvent.
118
119       QEvent::Show - Widget was shown on screen, QShowEvent.
120
121       QEvent::Hide - Widget was hidden, QHideEvent.
122
123       QEvent::ShowToParent - A child widget has been shown.
124
125       QEvent::HideToParent - A child widget has been hidden.
126
127       QEvent::Close - Widget was closed (permanently), QCloseEvent.
128
129       QEvent::ShowNormal - Widget should be shown normally (obsolete).
130
131       QEvent::ShowMaximized - Widget should be shown maximized (obsolete).
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133       QEvent::ShowMinimized - Widget should be shown minimized (obsolete).
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135       QEvent::ShowFullScreen - Widget should be shown full-screen (obsolete).
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137       QEvent::ShowWindowRequest - Widget's window should be shown (obsolete).
138
139       QEvent::DeferredDelete - The object will be deleted after it has
140       cleaned up.
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142       QEvent::Accel - Key press in child for shortcut key handling,
143       QKeyEvent.
144
145       QEvent::Wheel - Mouse wheel rolled, QWheelEvent.
146
147       QEvent::ContextMenu - Context popup menu, QContextMenuEvent
148
149       QEvent::AccelOverride - Key press in child, for overriding shortcut key
150       handling, QKeyEvent.
151
152       QEvent::AccelAvailable - internal.
153
154       QEvent::WindowActivate - Window was activated.
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156       QEvent::WindowDeactivate - Window was deactivated.
157
158       QEvent::CaptionChange - Widget's caption changed.
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160       QEvent::IconChange - Widget's icon changed.
161
162       QEvent::ParentFontChange - Font of the parent widget changed.
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164       QEvent::ApplicationFontChange - Default application font changed.
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166       QEvent::PaletteChange - Palette of the widget changed.
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168       QEvent::ParentPaletteChange - Palette of the parent widget changed.
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170       QEvent::ApplicationPaletteChange - Default application palette changed.
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172       QEvent::Clipboard - Clipboard contents have changed.
173
174       QEvent::SockAct - Socket activated, used to implement QSocketNotifier.
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176       QEvent::DragEnter - A drag-and-drop enters widget, QDragEnterEvent.
177
178       QEvent::DragMove - A drag-and-drop is in progress, QDragMoveEvent.
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180       QEvent::DragLeave - A drag-and-drop leaves widget, QDragLeaveEvent.
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182       QEvent::Drop - A drag-and-drop is completed, QDropEvent.
183
184       QEvent::DragResponse - Internal event used by Qt on some platforms.
185
186       QEvent::ChildInserted - Object gets a child, QChildEvent.
187
188       QEvent::ChildRemoved - Object loses a child, QChildEvent.
189
190       QEvent::LayoutHint - Widget child has changed layout properties.
191
192       QEvent::ActivateControl - Internal event used by Qt on some platforms.
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194       QEvent::DeactivateControl - Internal event used by Qt on some
195       platforms.
196
197       QEvent::LanguageChange - The application translation changed,
198       QTranslator
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200       QEvent::LayoutDirectionChange - The direction of layouts changed
201
202       QEvent::LocaleChange - The system locale changed
203
204       QEvent::Quit - Reserved.
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206       QEvent::Create - Reserved.
207
208       QEvent::Destroy - Reserved.
209
210       QEvent::Reparent - Reserved.
211
212       QEvent::Speech - Reserved for speech input.
213
214       QEvent::TabletMove - A Wacom Tablet Move Event.
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216       QEvent::Style - Internal use only
217
218       QEvent::TabletPress - A Wacom Tablet Press Event
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220       QEvent::TabletRelease - A Wacom Tablet Release Event
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222       QEvent::OkRequest - Internal event used by Qt on some platforms.
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224       QEvent::HelpRequest - Internal event used by Qt on some platforms.
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226       QEvent::IconDrag - Internal event used by Qt on some platforms when
227       proxy icon is dragged.
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229       QEvent::WindowStateChange - The window's state, i.e. minimized,
230       maximized or full-screen, has changed. See QWidget::windowState().
231
232       QEvent::WindowBlocked - The window is modally blocked
233
234       QEvent::WindowUnblocked - The window leaves modal blocking
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236       QEvent::User - User defined event.
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238       QEvent::MaxUser - Last user event id.
239
240       User events should have values between User and MaxUser inclusive.
241

MEMBER FUNCTION DOCUMENTATION

QEvent::QEvent ( Type type )

244       Contructs an event object of type type.
245

QEvent::~QEvent () [virtual]

247       Destroys the event. If it was posted, it will be removed from the list
248       of events to be posted.
249

bool QEvent::spontaneous () const

251       Returns TRUE if the event originated outside the application, i.e. it
252       is a system event; otherwise returns FALSE.
253

Type QEvent::type () const

255       Returns the event type.
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COPYRIGHT

263       Copyright 1992-2007 Trolltech ASA, http://www.trolltech.com.  See the
264       license file included in the distribution for a complete license
265       statement.
266

AUTHOR

268       Generated automatically from the source code.
269

BUGS

271       If you find a bug in Qt, please report it as described in
272       http://doc.trolltech.com/bughowto.html.  Good bug reports help us to
273       help you. Thank you.
274
275       The definitive Qt documentation is provided in HTML format; it is
276       located at $QTDIR/doc/html and can be read using Qt Assistant or with a
277       web browser. This man page is provided as a convenience for those users
278       who prefer man pages, although this format is not officially supported
279       by Trolltech.
280
281       If you find errors in this manual page, please report them to qt-
282       bugs@trolltech.com.  Please include the name of the manual page
283       (qevent.3qt) and the Qt version (3.3.8).
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287Trolltech AS                    2 February 2007                    QEvent(3qt)