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204 lines
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/kernel/qevent.cpp:479 -->
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<title>TQWheelEvent 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>TQWheelEvent Class Reference</h1>
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<p>The TQWheelEvent class contains parameters that describe a wheel event.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qevent-h.html">ntqevent.h</a>></tt>
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<p>Inherits <a href="ntqevent.html">TQEvent</a>.
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<p><a href="qwheelevent-members.html">List of all member functions.</a>
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<h2>Public Members</h2>
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<ul>
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<li class=fn><a href="#TQWheelEvent"><b>TQWheelEvent</b></a> ( const TQPoint & pos, int delta, int state, Orientation orient = Vertical )</li>
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<li class=fn><a href="#TQWheelEvent-2"><b>TQWheelEvent</b></a> ( const TQPoint & pos, const TQPoint & globalPos, int delta, int state, Orientation orient = Vertical )</li>
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<li class=fn>int <a href="#delta"><b>delta</b></a> () const</li>
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<li class=fn>const TQPoint & <a href="#pos"><b>pos</b></a> () const</li>
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<li class=fn>const TQPoint & <a href="#globalPos"><b>globalPos</b></a> () const</li>
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<li class=fn>int <a href="#x"><b>x</b></a> () const</li>
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<li class=fn>int <a href="#y"><b>y</b></a> () const</li>
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<li class=fn>int <a href="#globalX"><b>globalX</b></a> () const</li>
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<li class=fn>int <a href="#globalY"><b>globalY</b></a> () const</li>
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<li class=fn>ButtonState <a href="#state"><b>state</b></a> () const</li>
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<li class=fn>Orientation <a href="#orientation"><b>orientation</b></a> () const</li>
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<li class=fn>bool <a href="#isAccepted"><b>isAccepted</b></a> () const</li>
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<li class=fn>void <a href="#accept"><b>accept</b></a> ()</li>
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<li class=fn>void <a href="#ignore"><b>ignore</b></a> ()</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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The TQWheelEvent class contains parameters that describe a wheel event.
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<p>
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<p> Wheel events are sent to the widget under the mouse, and if that widget
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does not handle the event they are sent to the focus widget. The rotation
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distance is provided by <a href="#delta">delta</a>(). The functions <a href="#pos">pos</a>() and <a href="#globalPos">globalPos</a>() return
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the mouse pointer location at the time of the event.
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<p> A wheel event contains a special accept flag that indicates
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whether the receiver wants the event. You should call
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<a href="#accept">TQWheelEvent::accept</a>() if you handle the wheel event; otherwise it
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will be sent to the parent widget.
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<p> The TQWidget::setEnable() function can be used to enable or disable
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mouse and keyboard events for a widget.
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<p> The event handler <a href="ntqwidget.html#wheelEvent">TQWidget::wheelEvent</a>() receives wheel events.
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<p> <p>See also <a href="qmouseevent.html">TQMouseEvent</a>, <a href="ntqwidget.html#grabMouse">TQWidget::grabMouse</a>(), and <a href="events.html">Event Classes</a>.
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="TQWheelEvent"></a>TQWheelEvent::TQWheelEvent ( const <a href="ntqpoint.html">TQPoint</a> & pos, int delta, int state, <a href="ntqt.html#Orientation-enum">Orientation</a> orient = Vertical )
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</h3>
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<p> Constructs a wheel event object.
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<p> The <a href="#globalPos">globalPos</a>() is initialized to <a href="ntqcursor.html#pos">TQCursor::pos</a>(), i.e. <em>pos</em>,
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which is usually (but not always) right. Use the other constructor
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if you need to specify the global position explicitly. <em>delta</em>
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contains the rotation distance, <em>state</em> holds the keyboard
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modifier flags at the time of the event and <em>orient</em> holds the
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wheel's orientation.
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<p> <p>See also <a href="#pos">pos</a>(), <a href="#delta">delta</a>(), and <a href="#state">state</a>().
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<h3 class=fn><a name="TQWheelEvent-2"></a>TQWheelEvent::TQWheelEvent ( const <a href="ntqpoint.html">TQPoint</a> & pos, const <a href="ntqpoint.html">TQPoint</a> & globalPos, int delta, int state, <a href="ntqt.html#Orientation-enum">Orientation</a> orient = Vertical )
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</h3>
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<p> Constructs a wheel event object. The position when the event
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occurred is given in <em>pos</em> and <em>globalPos</em>. <em>delta</em> contains
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the rotation distance, <em>state</em> holds the keyboard modifier flags
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at the time of the event and <em>orient</em> holds the wheel's
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orientation.
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<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>().
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<h3 class=fn>void <a name="accept"></a>TQWheelEvent::accept ()
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</h3>
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<p> Sets the accept flag of the wheel event object.
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<p> Setting the accept parameter indicates that the receiver of the
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event wants the wheel event. Unwanted wheel events are sent to the
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parent widget.
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<p> The accept flag is set by default.
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<p> <p>See also <a href="#ignore">ignore</a>().
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<h3 class=fn>int <a name="delta"></a>TQWheelEvent::delta () const
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</h3>
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<p> Returns the distance that the wheel is rotated expressed in
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multiples or divisions of the <em>wheel delta</em>, which is currently
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defined to be 120. A positive value indicates that the wheel was
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rotated forwards away from the user; a negative value indicates
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that the wheel was rotated backwards toward the user.
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<p> The <em>wheel delta</em> constant was defined to be 120 by wheel mouse
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vendors to allow building finer-resolution wheels in the future,
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including perhaps a freely rotating wheel with no notches. The
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expectation is that such a device would send more messages per
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rotation but with a smaller value in each message.
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<h3 class=fn>const <a href="ntqpoint.html">TQPoint</a> & <a name="globalPos"></a>TQWheelEvent::globalPos () const
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</h3>
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<p> Returns the global position of the mouse pointer <em>at the time of the event</em>. This is important on asynchronous window systems
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such as X11; whenever you move your widgets around in response to
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mouse events, <a href="#globalPos">globalPos</a>() can differ a lot from the current
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pointer position <a href="ntqcursor.html#pos">TQCursor::pos</a>().
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<p> <p>See also <a href="#globalX">globalX</a>() and <a href="#globalY">globalY</a>().
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<h3 class=fn>int <a name="globalX"></a>TQWheelEvent::globalX () const
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</h3>
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<p> Returns the global x-position of the mouse pointer at the time of
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the event.
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<p> <p>See also <a href="#globalY">globalY</a>() and <a href="#globalPos">globalPos</a>().
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<h3 class=fn>int <a name="globalY"></a>TQWheelEvent::globalY () const
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</h3>
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<p> Returns the global y-position of the mouse pointer at the time of
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the event.
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<p> <p>See also <a href="#globalX">globalX</a>() and <a href="#globalPos">globalPos</a>().
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<h3 class=fn>void <a name="ignore"></a>TQWheelEvent::ignore ()
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</h3>
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<p> Clears the accept flag parameter of the wheel event object.
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<p> Clearing the accept parameter indicates that the event receiver
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does not want the wheel event. Unwanted wheel events are sent to
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the parent widget. The accept flag is set by default.
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<p> <p>See also <a href="#accept">accept</a>().
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<h3 class=fn>bool <a name="isAccepted"></a>TQWheelEvent::isAccepted () const
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</h3>
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<p> Returns TRUE if the receiver of the event handles the wheel event;
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otherwise returns FALSE.
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<h3 class=fn><a href="ntqt.html#Orientation-enum">Orientation</a> <a name="orientation"></a>TQWheelEvent::orientation () const
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</h3>
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<p> Returns the wheel's orientation.
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<h3 class=fn>const <a href="ntqpoint.html">TQPoint</a> & <a name="pos"></a>TQWheelEvent::pos () const
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</h3>
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<p> Returns the position of the mouse pointer, relative to the widget
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that received the event.
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<p> If you move your widgets around in response to mouse
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events, use <a href="#globalPos">globalPos</a>() instead of this function.
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<p> <p>See also <a href="#x">x</a>(), <a href="#y">y</a>(), and <a href="#globalPos">globalPos</a>().
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<h3 class=fn><a href="ntqt.html#ButtonState-enum">ButtonState</a> <a name="state"></a>TQWheelEvent::state () const
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</h3>
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<p> Returns the keyboard modifier flags of the event.
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<p> The returned value is <a href="ntqt.html#ButtonState-enum">ShiftButton</a>, <a href="ntqt.html#ButtonState-enum">ControlButton</a>, and <a href="ntqt.html#ButtonState-enum">AltButton</a> OR'ed together.
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<h3 class=fn>int <a name="x"></a>TQWheelEvent::x () const
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</h3>
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<p> Returns the x-position of the mouse pointer, relative to the
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widget that received the event.
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<p> <p>See also <a href="#y">y</a>() and <a href="#pos">pos</a>().
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<h3 class=fn>int <a name="y"></a>TQWheelEvent::y () const
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</h3>
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<p> Returns the y-position of the mouse pointer, relative to the
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widget that received the event.
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<p> <p>See also <a href="#x">x</a>() and <a href="#pos">pos</a>().
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<hr><p>
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This file is part of the <a href="index.html">TQt toolkit</a>.
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Copyright © 1995-2007
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<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
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<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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<td align=right><div align=right>TQt 3.3.8</div>
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