QEvent(3qt)QEvent(3qt)NAME
QEvent - Base class of all event classes. Event objects
contain event parameters
#include <qevent.h>
Inherits Qt.
Inherited by QChildEvent, QCloseEvent, QCustomEvent,
QDragLeaveEvent, QDragResponseEvent, QDropEvent,
QFocusEvent, QHideEvent, QKeyEvent, QMouseEvent,
QMoveEvent, QPaintEvent, QResizeEvent, QShowEvent,
QTimerEvent and QWheelEvent.
Public Members
enum Type { None = 0, Timer = 1, MouseButtonPress = 2,
MouseButtonRelease = 3, MouseButtonDblClick= 4,
MouseMove = 5, KeyPress = 6, KeyRelease = 7, FocusIn =
8, FocusOut = 9, Enter = 10, Leave = 11, Paint = 12,
Move = 13, Resize = 14, Create = 15, Destroy = 16,
Show = 17, Hide = 18, Close = 19, Quit = 20, Reparent
= 21, ShowMinimized = 22, ShowNormal = 23,
WindowActivate = 24, WindowDeactivate = 25,
ShowToParent = 26, HideToParent = 27, ShowMaximized =
28, Accel = 30, Wheel = 31, AccelAvailable = 32,
CaptionChange = 33, IconChange = 34, ParentFontChange
= 35, ApplicationFontChange = 36, ParentPaletteChange
= 37, ApplicationPaletteChange = 38, Clipboard = 40,
Speech = 42, SockAct = 50, AccelOverride = 51,
DragEnter = 60, DragMove = 61, DragLeave = 62, Drop =
63, DragResponse = 64, ChildInserted = 70,
ChildRemoved = 71, LayoutHint = 72, ShowWindowRequest
= 73, ActivateControl = 80, DeactivateControl = 81,
User = 1000 }
QEvent ( Type type )
virtual ~QEvent ()
Type type () const
DESCRIPTION
The QEvent class is base class of all event classes. Event
objects contain event parameters.
The main event loop of Qt (QApplication::exec()) fetches
native window system events from the event queue,
translates them into QEvent and sends the translated
events to QObjects.
Generally, events come from the underlying window system,
but it is also possible to manually send events through
the QApplication class using QApplication::sendEvent() and
QApplication::postEvent().
QObject received events by having its QObject::event()Trolltech AS 13 June 2001 1
QEvent(3qt)QEvent(3qt)
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 to another object.
The basic QEvent only contains an event type parameter.
Subclasses of QEvent contain additional parameters that
describe the particular event.
See also QObject::event(), QObject::installEventFilter(),
QWidget::event(), QApplication::sendEvent(),
QAppilcation::postEvent() and
QApplication::processEvents().
Member Type Documentation
QEvent::Type
This enum type defines the valid event types in Qt. The
currently defined event types, and the specialized classes
for each type, are:
None - not an event
Timer - regular timer events, QTimerEvent
MouseButtonPress - mouse press, QMouseEvent
MouseButtonRelease - mouse release, QMouseEvent
MouseButtonDblClick - mouse press again, QMouseEvent
MouseMove - mouse move, QMouseEvent
KeyPress - key press (including e.g. shift), QKeyEvent
KeyRelease - key release, QKeyEvent
FocusIn - widget gains keyboard focus, QFocusEvent
FocusOut - widget loses keyboard focus, QFocusEvent
Enter - mouse enters widget's space
Leave - mouse leaves widget's soace
Paint - screen update necessary, QPaintEvent
Move - widget's position changed, QMoveEvent
Resize - widget's size changed, QResizeEvent
Trolltech AS 13 June 2001 2
QEvent(3qt)QEvent(3qt)
Show - widget was shown on screen, QShowEvent
Hide - widget was removed from screen, QHideEvent
Close - widget was closed (permanently), QCloseEvent
Accel - key press in child, for shortcut key handling,
QKeyEvent
Wheel - mouse wheel rolled, QWheelEvent
AccelAvailable - an internal event used by Qt on some
platforms.
AccelOverride - key press in child, for overriding
shortcut key handling, QKeyEvent
WindowActivate - the window was activated
WindowDeactivate - the window was deactivated
CaptionChange - widget's caption changed
IconChange - widget's icon changed
ParentFontChange - the font of the parent widget changed.
ApplicationFontChange - the default application font
changed.
ParentPaletteChange - the palette of the parent widget
changed.
ApplicationPaletteChange - the default application palette
changed.
Clipboard - system clipboard contents have changed
SockAct - socket activated, used to implement
QSocketNotifier
DragEnter - drag-and-drop enters widget, QDragEnterEvent
DragMove - drag-and-drop in progress, QDragMoveEvent
DragLeave - drag-and-drop leaves widget, QDragLeaveEvent
Drop - drag-and-drop is completed, QDropEvent
DragResponse - an internal event used by Qt on some
platforms.
ChildInserted - object gets a child, QChildEvent
Trolltech AS 13 June 2001 3
QEvent(3qt)QEvent(3qt)
ChildRemoved - object loses a child, QChildEvent
LayoutHint - a widget child has changed layout properties
ActivateControl - an internal event used by Qt on some
platforms.
DeactivateControl - an internal event used by Qt on some
platforms.
Quit - reserved
Create - reserved
Destroy - reserved
Reparent - reserved
Configure - reserved
ConfigureLayout - reserved
User - user defined event
MEMBER FUNCTION DOCUMENTATIONQEvent::QEvent ( Type type )
Contructs an event object with a type.
QEvent::~QEvent () [virtual]
Destructs the event. If it was posted, it will be removed
from the list of events to be posted.
QEvent::Type QEvent::type() const
Returns the event type.
SEE ALSO
http://doc.trolltech.com/qevent.html
http://www.trolltech.com/faq/tech.html
COPYRIGHT
Copyright 1992-2001 Trolltech AS,
http://www.trolltech.com. See the license file included
in the distribution for a complete license statement.
AUTHOR
Generated automatically from the source code.
BUGS
If you find a bug in Qt, please report it as described in
http://doc.trolltech.com/bughowto.html. Good bug reports
make our job much simpler. Thank you.
In case of content or formattting problems with this
manual page, please report them to qt-bugs@trolltech.com.
Trolltech AS 13 June 2001 4
QEvent(3qt)QEvent(3qt)
Please include the name of the manual page (qevent.3qt)
and the Qt version (2.3.1).
Trolltech AS 13 June 2001 5
