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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><!-- /home/reggie/tmp/qt-3.0-reggie-5401/qt-x11-commercial-3.0.5/src/kernel/qevent.cpp:230 --><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>QMouseEvent Class</title><style type="text/css"><!--h3.fn,span.fn { margin-left: 1cm; text-indent: -1cm; }a:link { color: #004faf; text-decoration: none }a:visited { color: #672967; text-decoration: none }body { background: #ffffff; color: black; }--></style></head><body><table border="0" cellpadding="0" cellspacing="0" width="100%"><tr bgcolor="#E5E5E5"><td valign=center> <a href="index.html"><font color="#004faf">Home</font></a> | <a href="classes.html"><font color="#004faf">All Classes</font></a> | <a href="mainclasses.html"><font color="#004faf">Main Classes</font></a> | <a href="annotated.html"><font color="#004faf">Annotated</font></a> | <a href="groups.html"><font color="#004faf">Grouped Classes</font></a> | <a href="functions.html"><font color="#004faf">Functions</font></a></td><td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>QMouseEvent Class Reference</h1><p>The QMouseEvent class contains parameters that describe a mouse 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="qmouseevent-members.html">List of all member functions.</a><h2>Public Members</h2><ul><li><div class=fn><a href="#QMouseEvent"><b>QMouseEvent</b></a> ( Type type, const QPoint & pos, int button, int state )</div></li><li><div class=fn><a href="#QMouseEvent-2"><b>QMouseEvent</b></a> ( Type type, const QPoint & pos, const QPoint & globalPos, int button, int state )</div></li><li><div class=fn>const QPoint & <a href="#pos"><b>pos</b></a> () const</div></li><li><div class=fn>const QPoint & <a href="#globalPos"><b>globalPos</b></a> () const</div></li><li><div class=fn>int <a href="#x"><b>x</b></a> () const</div></li><li><div class=fn>int <a href="#y"><b>y</b></a> () const</div></li><li><div class=fn>int <a href="#globalX"><b>globalX</b></a> () const</div></li><li><div class=fn>int <a href="#globalY"><b>globalY</b></a> () const</div></li><li><div class=fn>ButtonState <a href="#button"><b>button</b></a> () const</div></li><li><div class=fn>ButtonState <a href="#state"><b>state</b></a> () const</div></li><li><div class=fn>ButtonState <a href="#stateAfter"><b>stateAfter</b></a> () const</div></li><li><div class=fn>bool <a href="#isAccepted"><b>isAccepted</b></a> () const</div></li><li><div class=fn>void <a href="#accept"><b>accept</b></a> ()</div></li><li><div class=fn>void <a href="#ignore"><b>ignore</b></a> ()</div></li></ul><hr><a name="details"></a><h2>Detailed Description</h2><p> The QMouseEvent class contains parameters that describe a mouse event.<p> Mouse events occur when a mouse button is pressed or releasedinside a widget or when the mouse cursor is moved.<p> Mouse move events will occur only when a mouse button is presseddown, unless mouse tracking has been enabled with<a href="qwidget.html#setMouseTracking">QWidget::setMouseTracking</a>().<p> Qt automatically grabs the mouse when a mouse button is pressedinside a widget; the widget will continue to receive mouse eventsuntil the last mouse button is released.<p> A mouse event contains a special accept flag that indicateswhether the receiver wants the event. You should call<a href="#ignore">QMouseEvent::ignore</a>() if the mouse event is not handled by yourwidget. A mouse event is propagated up the parent widget chainuntil a widget accepts it with <a href="#accept">QMouseEvent::accept</a>() or an eventfilter consumes it.<p> The functions <a href="#pos">pos</a>(), <a href="#x">x</a>() and <a href="#y">y</a>() give the cursor position relativeto the widget that receives the mouse event. If you move thewidget as a result of the mouse event, use the global positionreturned by <a href="#globalPos">globalPos</a>() to avoid a shaking motion.<p> The <a href="qwidget.html#setEnabled">QWidget::setEnabled</a>() function can be used to enable ordisable mouse and keyboard events for a widget.<p> The event handlers <a href="qwidget.html#mousePressEvent">QWidget::mousePressEvent</a>(),<a href="qwidget.html#mouseReleaseEvent">QWidget::mouseReleaseEvent</a>(), <a href="qwidget.html#mouseDoubleClickEvent">QWidget::mouseDoubleClickEvent</a>() and<a href="qwidget.html#mouseMoveEvent">QWidget::mouseMoveEvent</a>() receive mouse events.<p> <p>See also <a href="qwidget.html#mouseTracking-prop">QWidget::mouseTracking</a>, <a href="qwidget.html#grabMouse">QWidget::grabMouse</a>(), <a href="qcursor.html#pos">QCursor::pos</a>() and <a href="events.html">Event Classes</a>.<hr><h2>Member Function Documentation</h2><h3 class=fn><a name="QMouseEvent"></a>QMouseEvent::QMouseEvent ( <a href="qevent.html#Type-enum">Type</a> type, const <a href="qpoint.html">QPoint</a> & pos, int button, int state )</h3><p> Constructs a mouse event object.<p> The <em>type</em> parameter must be one of <a href="qevent.html#Type-enum">QEvent::MouseButtonPress</a>,<a href="qevent.html#Type-enum">QEvent::MouseButtonRelease</a>, <a href="qevent.html#Type-enum">QEvent::MouseButtonDblClick</a> or<a href="qevent.html#Type-enum">QEvent::MouseMove</a>.<p> The <em>pos</em> parameter specifies the position relative to thereceiving widget. <em>button</em> specifies the <a href="qt.html#ButtonState-enum">button</a> that caused the event, which should be <a href="qt.html#ButtonState-enum">Qt::NoButton</a> (0), if <em>type</em> is <a href="qevent.html#Type-enum">MouseMove</a>. <em>state</em> is the<a href="qt.html#ButtonState-enum">ButtonState</a> at the time of theevent.<p> The <a href="#globalPos">globalPos</a>() is initialized to <a href="qcursor.html#pos">QCursor::pos</a>(), which may not beappropriate. Use the other constructor to specify the globalposition explicitly.<h3 class=fn><a name="QMouseEvent-2"></a>QMouseEvent::QMouseEvent ( <a href="qevent.html#Type-enum">Type</a> type, const <a href="qpoint.html">QPoint</a> & pos, const <a href="qpoint.html">QPoint</a> & globalPos, int button, int state )</h3><p> Constructs a mouse event object.<p> The <em>type</em> parameter must be <a href="qevent.html#Type-enum">QEvent::MouseButtonPress</a>, <a href="qevent.html#Type-enum">QEvent::MouseButtonRelease</a>, <a href="qevent.html#Type-enum">QEvent::MouseButtonDblClick</a> or <a href="qevent.html#Type-enum">QEvent::MouseMove</a>.<p> The <em>pos</em> parameter specifies the position relative to thereceiving widget. <em>globalPos</em> is the position in absolutecoordinates. <em>button</em> specifies the <a href="qt.html#ButtonState-enum">button</a> that caused the event, which should be <a href="qt.html#ButtonState-enum">Qt::NoButton</a> (0), if <em>type</em> is <a href="qevent.html#Type-enum">MouseMove</a>. <em>state</em> is the<a href="qt.html#ButtonState-enum">ButtonState</a> at the time of theevent.<p> <h3 class=fn>void <a name="accept"></a>QMouseEvent::accept ()</h3><p> Sets the accept flag of the mouse event object.<p> Setting the accept parameter indicates that the receiver of theevent wants the mouse event. Unwanted mouse events are sent to theparent widget.<p> The accept flag is set by default.<p> <p>See also <a href="#ignore">ignore</a>().<h3 class=fn><a href="qt.html#ButtonState-enum">ButtonState</a> <a name="button"></a>QMouseEvent::button () const</h3><p> Returns the button that caused the event.<p> Possible return values are <a href="qt.html#ButtonState-enum">LeftButton</a>, <a href="qt.html#ButtonState-enum">RightButton</a>, <a href="qt.html#ButtonState-enum">MidButton</a> and <a href="qt.html#ButtonState-enum">NoButton</a>.<p> Note that the returned value is always <a href="qt.html#ButtonState-enum">NoButton</a> for mouse moveevents.<p> <p>See also <a href="#state">state</a>() and <a href="qt.html#ButtonState-enum">Qt::ButtonState</a>.<p>Examples: <a href="dclock-example.html#x901">dclock/dclock.cpp</a>, <a href="life-example.html#x1879">life/life.cpp</a> and <a href="tutorial1-14.html#x2404">t14/cannon.cpp</a>.<h3 class=fn>const <a href="qpoint.html">QPoint</a> & <a name="globalPos"></a>QMouseEvent::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 systemslike X11. Whenever you move your widgets around in response tomouse events, <a href="#globalPos">globalPos</a>() may differ a lot from the currentpointer position <a href="qcursor.html#pos">QCursor::pos</a>(), and from <a href="qwidget.html#mapToGlobal">QWidget::mapToGlobal</a>(<a href="#pos">pos</a>() ).<p> <p>See also <a href="#globalX">globalX</a>() and <a href="#globalY">globalY</a>().<p>Example: <a href="aclock-example.html#x1199">aclock/aclock.cpp</a>.<h3 class=fn>int <a name="globalX"></a>QMouseEvent::globalX () const</h3><p> Returns the global x-position of the mouse pointer at the time ofthe event.<p> <p>See also <a href="#globalY">globalY</a>() and <a href="#globalPos">globalPos</a>().<h3 class=fn>int <a name="globalY"></a>QMouseEvent::globalY () const</h3><p> Returns the global y-position of the mouse pointer at the time ofthe event.<p> <p>See also <a href="#globalX">globalX</a>() and <a href="#globalPos">globalPos</a>().<h3 class=fn>void <a name="ignore"></a>QMouseEvent::ignore ()</h3><p> Clears the accept flag parameter of the mouse event object.<p> Clearing the accept parameter indicates that the event receiverdoes not want the mouse event. Unwanted mouse events are sent tothe parent widget.<p> The accept flag is set by default.<p> <p>See also <a href="#accept">accept</a>().<h3 class=fn>bool <a name="isAccepted"></a>QMouseEvent::isAccepted () const</h3><p> Returns TRUE if the receiver of the event wants to keep the key;otherwise returns FALSE.<h3 class=fn>const <a href="qpoint.html">QPoint</a> & <a name="pos"></a>QMouseEvent::pos () const</h3><p> Returns the position of the mouse pointer relative to the widgetthat received the event.<p> If you move the widget as a result of the mouse event, use theglobal position returned by <a href="#globalPos">globalPos</a>() to avoid a shaking motion.<p> <p>See also <a href="#x">x</a>(), <a href="#y">y</a>() and <a href="#globalPos">globalPos</a>().<p>Examples: <a href="tutorial2-06.html#x2485">chart/canvasview.cpp</a>, <a href="drawlines-example.html#x1696">drawlines/connect.cpp</a>, <a href="life-example.html#x1880">life/life.cpp</a>, <a href="popup-example.html#x1577">popup/popup.cpp</a>, <a href="qmag-example.html#x1633">qmag/qmag.cpp</a>, <a href="tutorial1-14.html#x2405">t14/cannon.cpp</a> and <a href="tooltip-example.html#x562">tooltip/tooltip.cpp</a>.<h3 class=fn><a href="qt.html#ButtonState-enum">ButtonState</a> <a name="state"></a>QMouseEvent::state () const</h3><p> Returns the button state (a combination of mouse buttons andkeyboard modifiers), i.e. what buttons and keys were being pressedimmediately before the event was generated.<p> Note that this means that for <a href="qevent.html#Type-enum">QEvent::MouseButtonPress</a> and <a href="qevent.html#Type-enum">QEvent::MouseButtonDblClick</a>, the flag for the <a href="#button">button</a>() itself willnot be set in the state, whereas for <a href="qevent.html#Type-enum">QEvent::MouseButtonRelease</a>it will.<p> This value is mainly interesting for <a href="qevent.html#Type-enum">QEvent::MouseMove</a>; for theother cases, button() is more useful.<p> The returned value is <a href="qt.html#ButtonState-enum">LeftButton</a>, <a href="qt.html#ButtonState-enum">RightButton</a>, <a href="qt.html#ButtonState-enum">MidButton</a>,<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.<p> <p>See also <a href="#button">button</a>(), <a href="#stateAfter">stateAfter</a>() and <a href="qt.html#ButtonState-enum">Qt::ButtonState</a>.<p>Examples: <a href="popup-example.html#x1578">popup/popup.cpp</a> and <a href="showimg-example.html#x1272">showimg/showimg.cpp</a>.<h3 class=fn><a href="qt.html#ButtonState-enum">ButtonState</a> <a name="stateAfter"></a>QMouseEvent::stateAfter () const</h3><p> Returns the state of buttons after the event.<p> <p>See also <a href="#state">state</a>() and <a href="qt.html#ButtonState-enum">Qt::ButtonState</a>.<h3 class=fn>int <a name="x"></a>QMouseEvent::x () const</h3><p> Returns the x-position of the mouse pointer, relative to thewidget that received the event.<p> <p>See also <a href="#y">y</a>() and <a href="#pos">pos</a>().<p>Example: <a href="showimg-example.html#x1273">showimg/showimg.cpp</a>.<h3 class=fn>int <a name="y"></a>QMouseEvent::y () const</h3><p> Returns the y-position of the mouse pointer, relative to thewidget that received the event.<p> <p>See also <a href="#x">x</a>() and <a href="#pos">pos</a>().<p>Example: <a href="showimg-example.html#x1274">showimg/showimg.cpp</a>.<!-- eof --><hr><p>This file is part of the <a href="index.html">Qt toolkit</a>.Copyright © 1995-2002<a href="http://www.trolltech.com/">Trolltech</a>. 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