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<title>QWheelEvent Class</title>
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>QWheelEvent Class Reference</h1>
<p>The QWheelEvent class contains parameters that describe a wheel event.
<a href="#details">More...</a>
<p><tt>#include <<a href="qevent-h.html">qevent.h</a>></tt>
<p>Inherits <a href="qevent.html">QEvent</a>.
<p><a href="qwheelevent-members.html">List of all member functions.</a>
<h2>Public Members</h2>
<ul>
<li class=fn><a href="#QWheelEvent"><b>QWheelEvent</b></a> ( const QPoint & pos, int delta, int state, Orientation orient = Vertical )</li>
<li class=fn><a href="#QWheelEvent-2"><b>QWheelEvent</b></a> ( const QPoint & pos, const QPoint & globalPos, int delta, int state, Orientation orient = Vertical )</li>
<li class=fn>int <a href="#delta"><b>delta</b></a> () const</li>
<li class=fn>const QPoint & <a href="#pos"><b>pos</b></a> () const</li>
<li class=fn>const QPoint & <a href="#globalPos"><b>globalPos</b></a> () const</li>
<li class=fn>int <a href="#x"><b>x</b></a> () const</li>
<li class=fn>int <a href="#y"><b>y</b></a> () const</li>
<li class=fn>int <a href="#globalX"><b>globalX</b></a> () const</li>
<li class=fn>int <a href="#globalY"><b>globalY</b></a> () const</li>
<li class=fn>ButtonState <a href="#state"><b>state</b></a> () const</li>
<li class=fn>Orientation <a href="#orientation"><b>orientation</b></a> () const</li>
<li class=fn>bool <a href="#isAccepted"><b>isAccepted</b></a> () const</li>
<li class=fn>void <a href="#accept"><b>accept</b></a> ()</li>
<li class=fn>void <a href="#ignore"><b>ignore</b></a> ()</li>
</ul>
<hr><a name="details"></a><h2>Detailed Description</h2>
The QWheelEvent class contains parameters that describe a wheel event.
<p>
<p> Wheel events are sent to the widget under the mouse, and if that widget
does not handle the event they are sent to the focus widget. The rotation
distance is provided by <a href="#delta">delta</a>(). The functions <a href="#pos">pos</a>() and <a href="#globalPos">globalPos</a>() return
the mouse pointer location at the time of the event.
<p> A wheel event contains a special accept flag that indicates
whether the receiver wants the event. You should call
<a href="#accept">QWheelEvent::accept</a>() if you handle the wheel event; otherwise it
will be sent to the parent widget.
<p> The QWidget::setEnable() function can be used to enable or disable
mouse and keyboard events for a widget.
<p> The event handler <a href="qwidget.html#wheelEvent">QWidget::wheelEvent</a>() receives wheel events.
<p> <p>See also <a href="qmouseevent.html">QMouseEvent</a>, <a href="qwidget.html#grabMouse">QWidget::grabMouse</a>(), and <a href="events.html">Event Classes</a>.
<hr><h2>Member Function Documentation</h2>
<h3 class=fn><a name="QWheelEvent"></a>QWheelEvent::QWheelEvent ( const <a href="qpoint.html">QPoint</a> & pos, int delta, int state, <a href="qt.html#Orientation-enum">Orientation</a> orient = Vertical )
</h3>
<p> Constructs a wheel event object.
<p> The <a href="#globalPos">globalPos</a>() is initialized to <a href="qcursor.html#pos">QCursor::pos</a>(), i.e. <em>pos</em>,
which is usually (but not always) right. Use the other constructor
if you need to specify the global position explicitly. <em>delta</em>
contains the rotation distance, <em>state</em> holds the keyboard
modifier flags at the time of the event and <em>orient</em> holds the
wheel's orientation.
<p> <p>See also <a href="#pos">pos</a>(), <a href="#delta">delta</a>(), and <a href="#state">state</a>().
<h3 class=fn><a name="QWheelEvent-2"></a>QWheelEvent::QWheelEvent ( const <a href="qpoint.html">QPoint</a> & pos, const <a href="qpoint.html">QPoint</a> & globalPos, int delta, int state, <a href="qt.html#Orientation-enum">Orientation</a> orient = Vertical )
</h3>
<p> Constructs a wheel event object. The position when the event
occurred is given in <em>pos</em> and <em>globalPos</em>. <em>delta</em> contains
the rotation distance, <em>state</em> holds the keyboard modifier flags
at the time of the event and <em>orient</em> holds the wheel's
orientation.
<p> <p>See also <a href="#pos">pos</a>(), <a href="#globalPos">globalPos</a>(), <a href="#delta">delta</a>(), and <a href="#state">state</a>().
<h3 class=fn>void <a name="accept"></a>QWheelEvent::accept ()
</h3>
<p> Sets the accept flag of the wheel event object.
<p> Setting the accept parameter indicates that the receiver of the
event wants the wheel event. Unwanted wheel events are sent to the
parent widget.
<p> The accept flag is set by default.
<p> <p>See also <a href="#ignore">ignore</a>().
<h3 class=fn>int <a name="delta"></a>QWheelEvent::delta () const
</h3>
<p> Returns the distance that the wheel is rotated expressed in
multiples or divisions of the <em>wheel delta</em>, which is currently
defined to be 120. A positive value indicates that the wheel was
rotated forwards away from the user; a negative value indicates
that the wheel was rotated backwards toward the user.
<p> The <em>wheel delta</em> constant was defined to be 120 by wheel mouse
vendors to allow building finer-resolution wheels in the future,
including perhaps a freely rotating wheel with no notches. The
expectation is that such a device would send more messages per
rotation but with a smaller value in each message.
<h3 class=fn>const <a href="qpoint.html">QPoint</a> & <a name="globalPos"></a>QWheelEvent::globalPos () const
</h3>
<p> Returns the global position of the mouse pointer <em>at the time of the event</em>. This is important on asynchronous window systems
such as X11; whenever you move your widgets around in response to
mouse events, <a href="#globalPos">globalPos</a>() can differ a lot from the current
pointer position <a href="qcursor.html#pos">QCursor::pos</a>().
<p> <p>See also <a href="#globalX">globalX</a>() and <a href="#globalY">globalY</a>().
<h3 class=fn>int <a name="globalX"></a>QWheelEvent::globalX () const
</h3>
<p> Returns the global x-position of the mouse pointer at the time of
the event.
<p> <p>See also <a href="#globalY">globalY</a>() and <a href="#globalPos">globalPos</a>().
<h3 class=fn>int <a name="globalY"></a>QWheelEvent::globalY () const
</h3>
<p> Returns the global y-position of the mouse pointer at the time of
the event.
<p> <p>See also <a href="#globalX">globalX</a>() and <a href="#globalPos">globalPos</a>().
<h3 class=fn>void <a name="ignore"></a>QWheelEvent::ignore ()
</h3>
<p> Clears the accept flag parameter of the wheel event object.
<p> Clearing the accept parameter indicates that the event receiver
does not want the wheel event. Unwanted wheel events are sent to
the parent widget. The accept flag is set by default.
<p> <p>See also <a href="#accept">accept</a>().
<h3 class=fn>bool <a name="isAccepted"></a>QWheelEvent::isAccepted () const
</h3>
<p> Returns TRUE if the receiver of the event handles the wheel event;
otherwise returns FALSE.
<h3 class=fn><a href="qt.html#Orientation-enum">Orientation</a> <a name="orientation"></a>QWheelEvent::orientation () const
</h3>
<p> Returns the wheel's orientation.
<h3 class=fn>const <a href="qpoint.html">QPoint</a> & <a name="pos"></a>QWheelEvent::pos () const
</h3>
<p> Returns the position of the mouse pointer, relative to the widget
that received the event.
<p> If you move your widgets around in response to mouse
events, use <a href="#globalPos">globalPos</a>() instead of this function.
<p> <p>See also <a href="#x">x</a>(), <a href="#y">y</a>(), and <a href="#globalPos">globalPos</a>().
<h3 class=fn><a href="qt.html#ButtonState-enum">ButtonState</a> <a name="state"></a>QWheelEvent::state () const
</h3>
<p> Returns the keyboard modifier flags of the event.
<p> The returned value is <a href="qt.html#ButtonState-enum">ShiftButton</a>, <a href="qt.html#ButtonState-enum">ControlButton</a>, and <a href="qt.html#ButtonState-enum">AltButton</a> OR'ed together.
<h3 class=fn>int <a name="x"></a>QWheelEvent::x () const
</h3>
<p> Returns the x-position of the mouse pointer, relative to the
widget that received the event.
<p> <p>See also <a href="#y">y</a>() and <a href="#pos">pos</a>().
<h3 class=fn>int <a name="y"></a>QWheelEvent::y () const
</h3>
<p> Returns the y-position of the mouse pointer, relative to the
widget that received the event.
<p> <p>See also <a href="#x">x</a>() and <a href="#pos">pos</a>().
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