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234 lines
14 KiB
234 lines
14 KiB
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<title>QMouseEvent 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>QMouseEvent Class Reference</h1>
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<p>The QMouseEvent class contains parameters that describe a mouse event.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qevent-h.html">qevent.h</a>></tt>
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<p>Inherits <a href="qevent.html">QEvent</a>.
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<p><a href="qmouseevent-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="#QMouseEvent"><b>QMouseEvent</b></a> ( Type type, const QPoint & pos, int button, int state )</li>
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<li class=fn><a href="#QMouseEvent-2"><b>QMouseEvent</b></a> ( Type type, const QPoint & pos, const QPoint & globalPos, int button, int state )</li>
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<li class=fn>const QPoint & <a href="#pos"><b>pos</b></a> () const</li>
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<li class=fn>const QPoint & <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="#button"><b>button</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>ButtonState <a href="#stateAfter"><b>stateAfter</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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<p> The QMouseEvent class contains parameters that describe a mouse event.
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<p> Mouse events occur when a mouse button is pressed or released
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inside a widget or when the mouse cursor is moved.
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<p> Mouse move events will occur only when a mouse button is pressed
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down, unless mouse tracking has been enabled with
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<a href="qwidget.html#setMouseTracking">QWidget::setMouseTracking</a>().
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<p> Qt automatically grabs the mouse when a mouse button is pressed
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inside a widget; the widget will continue to receive mouse events
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until the last mouse button is released.
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<p> A mouse 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="#ignore">QMouseEvent::ignore</a>() if the mouse event is not handled by your
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widget. A mouse event is propagated up the parent widget chain
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until a widget accepts it with <a href="#accept">QMouseEvent::accept</a>() or an event
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filter consumes it.
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<p> The functions <a href="#pos">pos</a>(), <a href="#x">x</a>() and <a href="#y">y</a>() give the cursor position relative
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to the widget that receives the mouse event. If you move the
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widget as a result of the mouse event, use the global position
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returned by <a href="#globalPos">globalPos</a>() to avoid a shaking motion.
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<p> The <a href="qwidget.html#setEnabled">QWidget::setEnabled</a>() function can be used to enable or
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disable mouse and keyboard events for a widget.
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<p> The event handlers <a href="qwidget.html#mousePressEvent">QWidget::mousePressEvent</a>(),
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<a href="qwidget.html#mouseReleaseEvent">QWidget::mouseReleaseEvent</a>(), <a href="qwidget.html#mouseDoubleClickEvent">QWidget::mouseDoubleClickEvent</a>() and
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<a href="qwidget.html#mouseMoveEvent">QWidget::mouseMoveEvent</a>() receive mouse events.
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<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>.
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<hr><h2>Member Function Documentation</h2>
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<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 )
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</h3>
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<p> Constructs a mouse event object.
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<p> The <em>type</em> parameter must be one of <a href="qevent.html#Type-enum">QEvent::MouseButtonPress</a>,
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<a href="qevent.html#Type-enum">QEvent::MouseButtonRelease</a>, <a href="qevent.html#Type-enum">QEvent::MouseButtonDblClick</a> or
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<a href="qevent.html#Type-enum">QEvent::MouseMove</a>.
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<p> The <em>pos</em> parameter specifies the position relative to the
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receiving 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
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<a href="qt.html#ButtonState-enum">ButtonState</a> at the time of the
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event.
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<p> The <a href="#globalPos">globalPos</a>() is initialized to <a href="qcursor.html#pos">QCursor::pos</a>(), which may not be
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appropriate. Use the other constructor to specify the global
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position explicitly.
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<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 )
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</h3>
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<p> Constructs a mouse event object.
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<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>.
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<p> The <em>pos</em> parameter specifies the position relative to the
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receiving widget. <em>globalPos</em> is the position in absolute
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coordinates. <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
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<a href="qt.html#ButtonState-enum">ButtonState</a> at the time of the
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event.
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<p>
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<h3 class=fn>void <a name="accept"></a>QMouseEvent::accept ()
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</h3>
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<p> Sets the accept flag of the mouse event object.
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<p> Setting the accept parameter indicates that the receiver of the
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event wants the mouse event. Unwanted mouse 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><a href="qt.html#ButtonState-enum">ButtonState</a> <a name="button"></a>QMouseEvent::button () const
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</h3>
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<p> Returns the button that caused the event.
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<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>.
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<p> Note that the returned value is always <a href="qt.html#ButtonState-enum">NoButton</a> for mouse move
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events.
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<p> <p>See also <a href="#state">state</a>() and <a href="qt.html#ButtonState-enum">Qt::ButtonState</a>.
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<p>Examples: <a href="dclock-example.html#x1101">dclock/dclock.cpp</a>, <a href="life-example.html#x1890">life/life.cpp</a>, and <a href="tutorial1-14.html#x2417">t14/cannon.cpp</a>.
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<h3 class=fn>const <a href="qpoint.html">QPoint</a> & <a name="globalPos"></a>QMouseEvent::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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like X11. Whenever you move your widgets around in response to
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mouse events, <a href="#globalPos">globalPos</a>() may differ a lot from the current
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pointer position <a href="qcursor.html#pos">QCursor::pos</a>(), and from <a href="qwidget.html#mapToGlobal">QWidget::mapToGlobal</a>(
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<a href="#pos">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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<p>Example: <a href="aclock-example.html#x1181">aclock/aclock.cpp</a>.
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<h3 class=fn>int <a name="globalX"></a>QMouseEvent::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>QMouseEvent::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>QMouseEvent::ignore ()
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</h3>
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<p> Clears the accept flag parameter of the mouse event object.
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<p> Clearing the accept parameter indicates that the event receiver
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does not want the mouse event. Unwanted mouse events are sent to
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the parent widget.
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<p> 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>QMouseEvent::isAccepted () const
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</h3>
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<p> Returns TRUE if the receiver of the event wants to keep the key;
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otherwise returns FALSE.
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<h3 class=fn>const <a href="qpoint.html">QPoint</a> & <a name="pos"></a>QMouseEvent::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 the widget as a result of the mouse event, use the
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global position returned by <a href="#globalPos">globalPos</a>() to avoid a shaking motion.
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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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<p>Examples: <a href="tutorial2-06.html#x2580">chart/canvasview.cpp</a>, <a href="drawlines-example.html#x1654">drawlines/connect.cpp</a>, <a href="life-example.html#x1891">life/life.cpp</a>, <a href="popup-example.html#x1611">popup/popup.cpp</a>, <a href="qmag-example.html#x1780">qmag/qmag.cpp</a>, <a href="tutorial1-14.html#x2418">t14/cannon.cpp</a>, and <a href="tooltip-example.html#x443">tooltip/tooltip.cpp</a>.
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<h3 class=fn><a href="qt.html#ButtonState-enum">ButtonState</a> <a name="state"></a>QMouseEvent::state () const
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</h3>
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<p> Returns the button state (a combination of mouse buttons and
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keyboard modifiers), i.e. what buttons and keys were being pressed
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immediately before the event was generated.
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<p> This means that if you have a <a href="qevent.html#Type-enum">QEvent::MouseButtonPress</a> or a <a href="qevent.html#Type-enum">QEvent::MouseButtonDblClick</a> <a href="#state">state</a>() will <em>not</em> include the mouse
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button that's pressed. But once the mouse button has been
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released, the <a href="qevent.html#Type-enum">QEvent::MouseButtonRelease</a> event will have the
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<a href="#button">button</a>() that was pressed.
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<p> This value is mainly interesting for <a href="qevent.html#Type-enum">QEvent::MouseMove</a>; for the
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other cases, button() is more useful.
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<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>,
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<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.
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<p> <p>See also <a href="#button">button</a>(), <a href="#stateAfter">stateAfter</a>(), and <a href="qt.html#ButtonState-enum">Qt::ButtonState</a>.
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<p>Examples: <a href="popup-example.html#x1612">popup/popup.cpp</a> and <a href="showimg-example.html#x1334">showimg/showimg.cpp</a>.
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<h3 class=fn><a href="qt.html#ButtonState-enum">ButtonState</a> <a name="stateAfter"></a>QMouseEvent::stateAfter () const
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</h3>
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<p> Returns the state of buttons after the event.
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<p> <p>See also <a href="#state">state</a>() and <a href="qt.html#ButtonState-enum">Qt::ButtonState</a>.
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<h3 class=fn>int <a name="x"></a>QMouseEvent::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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<p>Example: <a href="showimg-example.html#x1335">showimg/showimg.cpp</a>.
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<h3 class=fn>int <a name="y"></a>QMouseEvent::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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<p>Example: <a href="showimg-example.html#x1336">showimg/showimg.cpp</a>.
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<!-- eof -->
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<hr><p>
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This file is part of the <a href="index.html">Qt 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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<table width=100% cellspacing=0 border=0><tr>
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<td>Copyright © 2007
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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>Qt 3.3.8</div>
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