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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<h1 align=center>QEvent Class Reference</h1><br clear="all">
<p>
The QEvent class is base class of all event classes. Event objects contain event parameters.
<a href="#details">More...</a>
<p>
<code>#include <<a href="qevent-h.html">qevent.h</a>></code>
<p>
Inherits <a href="qt.html">Qt</a>.
<p>Inherited by <a href="qchildevent.html">QChildEvent</a>, <a href="qcloseevent.html">QCloseEvent</a>, <a href="qcustomevent.html">QCustomEvent</a>, <a href="qdragleaveevent.html">QDragLeaveEvent</a>, QDragResponseEvent, <a href="qdropevent.html">QDropEvent</a>, <a href="qfocusevent.html">QFocusEvent</a>, <a href="qhideevent.html">QHideEvent</a>, <a href="qkeyevent.html">QKeyEvent</a>, <a href="qmouseevent.html">QMouseEvent</a>, <a href="qmoveevent.html">QMoveEvent</a>, <a href="qpaintevent.html">QPaintEvent</a>, <a href="qresizeevent.html">QResizeEvent</a>, <a href="qshowevent.html">QShowEvent</a>, <a href="qtimerevent.html">QTimerEvent</a> and <a href="qwheelevent.html">QWheelEvent</a>.
<p><a href="qevent-members.html">List of all member functions.</a>
<h2>Public Members</h2>
<ul>
<li><div class="fn">enum<a href="#Type"><b>Type</b></a>{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}</div>
<li><div class="fn"><a href="#ca89e5"><b>QEvent</b></a>(Typetype)</div>
<li><div class="fn">virtual<a href="#343abf"><b>~QEvent</b></a>()</div>
<li><div class="fn">Type<a href="#4d3e5b"><b>type</b></a>()const</div>
</ul>
<hr><h2><a name="details"></a>Detailed Description</h2>
The QEvent class is base class of all event classes. Event objects contain event parameters.
<p>
The main event loop of Qt (<a href="qapplication.html#84c7bf">QApplication::exec</a>()) fetches
native window system events from the event queue, translates them
into QEvent and sends the translated events to QObjects.
<p>Generally, events come from the underlying window system, but it is
also possible to manually send events through the <a href="qapplication.html">QApplication</a> class
using <a href="qapplication.html#333290">QApplication::sendEvent</a>() and <a href="qapplication.html#96d77e">QApplication::postEvent</a>().
<p><a href="qobject.html">QObject</a> received events by having its <a href="qobject.html#c67adb">QObject::event</a>() function
called. The function can be reimplemented in subclasses to customize
event handling and add additional event types. <a href="qwidget.html#6ff658">QWidget::event</a>() is
a notable example. By default, events are dispatched to event handlers
like <a href="qobject.html#7fd5bf">QObject::timerEvent</a>() and <a href="qwidget.html#a51d92">QWidget::mouseMoveEvent</a>().
<a href="qobject.html#185219">QObject::installEventFilter</a>() allows an object to intercept events
to another object.
<p>The basic QEvent only contains an event type parameter. Subclasses
of QEvent contain additional parameters that describe the particular
event.
<p>See also <a href="qobject.html#c67adb">QObject::event</a>(), <a href="qobject.html#185219">QObject::installEventFilter</a>(), <a href="qwidget.html#6ff658">QWidget::event</a>(), <a href="qapplication.html#333290">QApplication::sendEvent</a>(), QAppilcation::postEvent() and <a href="qapplication.html#003456">QApplication::processEvents</a>().
<hr><h2>Member Type Documentation</h2>
<h3 class="fn"><a name="Type">QEvent::Type</a></h3>
This enum type defines the valid event types in Qt. The currently
defined event types, and the specialized classes for each type, are: <ul>
<li> <code>None</code> - not an event
<li> <code>Timer</code> - regular timer events, <a href="qtimerevent.html">QTimerEvent</a>
<li> <code>MouseButtonPress</code> - mouse press, <a href="qmouseevent.html">QMouseEvent</a>
<li> <code>MouseButtonRelease</code> - mouse release, QMouseEvent
<li> <code>MouseButtonDblClick</code> - mouse press again, QMouseEvent
<li> <code>MouseMove</code> - mouse move, QMouseEvent
<li> <code>KeyPress</code> - key press (including e.g. shift), <a href="qkeyevent.html">QKeyEvent</a>
<li> <code>KeyRelease</code> - key release, QKeyEvent
<li> <code>FocusIn</code> - widget gains keyboard focus, <a href="qfocusevent.html">QFocusEvent</a>
<li> <code>FocusOut</code> - widget loses keyboard focus, QFocusEvent
<li> <code>Enter</code> - mouse enters widget's space
<li> <code>Leave</code> - mouse leaves widget's soace
<li> <code>Paint</code> - screen update necessary, <a href="qpaintevent.html">QPaintEvent</a>
<li> <code>Move</code> - widget's position changed, <a href="qmoveevent.html">QMoveEvent</a>
<li> <code>Resize</code> - widget's size changed, <a href="qresizeevent.html">QResizeEvent</a>
<li> <code>Show</code> - widget was shown on screen, <a href="qshowevent.html">QShowEvent</a>
<li> <code>Hide</code> - widget was removed from screen, <a href="qhideevent.html">QHideEvent</a>
<li> <code>Close</code> - widget was closed (permanently), <a href="qcloseevent.html">QCloseEvent</a>
<li> <code>Accel</code> - key press in child, for shortcut key handling, QKeyEvent
<li> <code>Wheel</code> - mouse wheel rolled, <a href="qwheelevent.html">QWheelEvent</a>
<li> <code>AccelAvailable</code> - an internal event used by Qt on some platforms.
<li> <code>AccelOverride</code> - key press in child, for overriding shortcut key handling, QKeyEvent
<li> <code>WindowActivate</code> - the window was activated
<li> <code>WindowDeactivate</code> - the window was deactivated
<li> <code>CaptionChange</code> - widget's caption changed
<li> <code>IconChange</code> - widget's icon changed
<li> <code>ParentFontChange</code> - the font of the parent widget changed.
<li> <code>ApplicationFontChange</code> - the default application font changed.
<li> <code>ParentPaletteChange</code> - the palette of the parent widget changed.
<li> <code>ApplicationPaletteChange</code> - the default application palette changed.
<li> <code>Clipboard</code> - system clipboard contents have changed
<li> <code>SockAct</code> - socket activated, used to implement <a href="qsocketnotifier.html">QSocketNotifier</a>
<li> <code>DragEnter</code> - drag-and-drop enters widget, <a href="qdragenterevent.html">QDragEnterEvent</a>
<li> <code>DragMove</code> - drag-and-drop in progress, <a href="qdragmoveevent.html">QDragMoveEvent</a>
<li> <code>DragLeave</code> - drag-and-drop leaves widget, <a href="qdragleaveevent.html">QDragLeaveEvent</a>
<li> <code>Drop</code> - drag-and-drop is completed, <a href="qdropevent.html">QDropEvent</a>
<li> <code>DragResponse</code> - an internal event used by Qt on some platforms.
<li> <code>ChildInserted</code> - object gets a child, <a href="qchildevent.html">QChildEvent</a>
<li> <code>ChildRemoved</code> - object loses a child, QChildEvent
<li> <code>LayoutHint</code> - a widget child has changed layout properties
<li> <code>ActivateControl</code> - an internal event used by Qt on some platforms.
<li> <code>DeactivateControl</code> - an internal event used by Qt on some platforms.
<li> <code>Quit</code> - reserved
<li> <code>Create</code> - reserved
<li> <code>Destroy</code> - reserved
<li> <code>Reparent</code> - reserved
<li> <code>Configure</code> - reserved
<li> <code>ConfigureLayout</code> - reserved
<li> <code>User</code> - user defined event
</ul>
<hr><h2>Member Function Documentation</h2>
<h3 class="fn"><a name="ca89e5"></a>QEvent::QEvent(<a href="qevent.html#Type">Type</a>type)</h3>
<p>Contructs an event object with a <em>type.</em>
<h3 class="fn"><a name="343abf"></a>QEvent::~QEvent() <code>[virtual]</code></h3>
<p>Destructs the event. If it was <a href="qapplication.html#96d77e">posted</a>,
it will be removed from the list of events to be posted.
<h3 class="fn">QEvent::Type<a name="4d3e5b"></a>QEvent::type()const</h3>
<p>Returns the event type.
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