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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>QScrollBar Class Reference</h1>
<p>The QScrollBar widget provides a vertical or horizontal scroll bar.
<a href="#details">More...</a>
<p><tt>#include <<a href="qscrollbar-h.html">qscrollbar.h</a>></tt>
<p>Inherits <a href="qwidget.html">QWidget</a> and <a href="qrangecontrol.html">QRangeControl</a>.
<p><a href="qscrollbar-members.html">List of all member functions.</a>
<h2>Public Members</h2>
<ul>
<li class=fn><a href="#QScrollBar"><b>QScrollBar</b></a> ( QWidget * parent, const char * name = 0 )</li>
<li class=fn><a href="#QScrollBar-2"><b>QScrollBar</b></a> ( Orientation orientation, QWidget * parent, const char * name = 0 )</li>
<li class=fn><a href="#QScrollBar-3"><b>QScrollBar</b></a> ( int minValue, int maxValue, int lineStep, int pageStep, int value, Orientation orientation, QWidget * parent, const char * name = 0 )</li>
<li class=fn><a href="#~QScrollBar"><b>~QScrollBar</b></a> ()</li>
<li class=fn>virtual void <a href="#setOrientation"><b>setOrientation</b></a> ( Orientation )</li>
<li class=fn>Orientation <a href="#orientation"><b>orientation</b></a> () const</li>
<li class=fn>virtual void <a href="#setTracking"><b>setTracking</b></a> ( bool enable )</li>
<li class=fn>bool <a href="#tracking"><b>tracking</b></a> () const</li>
<li class=fn>bool <a href="#draggingSlider"><b>draggingSlider</b></a> () const</li>
<li class=fn>virtual void <a href="#setPalette"><b>setPalette</b></a> ( const QPalette & p )</li>
<li class=fn>int <a href="#minValue"><b>minValue</b></a> () const</li>
<li class=fn>int <a href="#maxValue"><b>maxValue</b></a> () const</li>
<li class=fn>void <a href="#setMinValue"><b>setMinValue</b></a> ( int )</li>
<li class=fn>void <a href="#setMaxValue"><b>setMaxValue</b></a> ( int )</li>
<li class=fn>int <a href="#lineStep"><b>lineStep</b></a> () const</li>
<li class=fn>int <a href="#pageStep"><b>pageStep</b></a> () const</li>
<li class=fn>void <a href="#setLineStep"><b>setLineStep</b></a> ( int )</li>
<li class=fn>void <a href="#setPageStep"><b>setPageStep</b></a> ( int )</li>
<li class=fn>int <a href="#value"><b>value</b></a> () const</li>
<li class=fn>int <a href="#sliderStart"><b>sliderStart</b></a> () const</li>
<li class=fn>QRect <a href="#sliderRect"><b>sliderRect</b></a> () const</li>
</ul>
<h2>Public Slots</h2>
<ul>
<li class=fn>void <a href="#setValue"><b>setValue</b></a> ( int )</li>
</ul>
<h2>Signals</h2>
<ul>
<li class=fn>void <a href="#valueChanged"><b>valueChanged</b></a> ( int value )</li>
<li class=fn>void <a href="#sliderPressed"><b>sliderPressed</b></a> ()</li>
<li class=fn>void <a href="#sliderMoved"><b>sliderMoved</b></a> ( int value )</li>
<li class=fn>void <a href="#sliderReleased"><b>sliderReleased</b></a> ()</li>
<li class=fn>void <a href="#nextLine"><b>nextLine</b></a> ()</li>
<li class=fn>void <a href="#prevLine"><b>prevLine</b></a> ()</li>
<li class=fn>void <a href="#nextPage"><b>nextPage</b></a> ()</li>
<li class=fn>void <a href="#prevPage"><b>prevPage</b></a> ()</li>
</ul>
<h2>Properties</h2>
<ul>
<li class=fn>bool <a href="#draggingSlider-prop"><b>draggingSlider</b></a> - whether the user has clicked the mouse on the slider and is currently dragging it <em>(read only)</em></li>
<li class=fn>int <a href="#lineStep-prop"><b>lineStep</b></a> - the line step</li>
<li class=fn>int <a href="#maxValue-prop"><b>maxValue</b></a> - the scroll bar's maximum value</li>
<li class=fn>int <a href="#minValue-prop"><b>minValue</b></a> - the scroll bar's minimum value</li>
<li class=fn>Orientation <a href="#orientation-prop"><b>orientation</b></a> - the orientation of the scroll bar</li>
<li class=fn>int <a href="#pageStep-prop"><b>pageStep</b></a> - the page step</li>
<li class=fn>bool <a href="#tracking-prop"><b>tracking</b></a> - whether scroll bar tracking is enabled</li>
<li class=fn>int <a href="#value-prop"><b>value</b></a> - the scroll bar's value</li>
</ul>
<h2>Protected Members</h2>
<ul>
<li class=fn>virtual void <a href="#hideEvent"><b>hideEvent</b></a> ( QHideEvent * )</li>
</ul>
<hr><a name="details"></a><h2>Detailed Description</h2>
The QScrollBar widget provides a vertical or horizontal scroll bar.
<p>
<p> A scroll bar allows the user to control a value within a
program-definable range and gives users a visible indication of
the current value of a <a href="qrangecontrol.html">range control</a>.
<p> Scroll bars include four separate controls:
<p> <ul>
<p> <li> The <em>line-up</em> and <em>line-down</em> controls are little buttons
which the user can use to move one "line" up or down. The meaning
of line is configurable. In editors and list boxes it means one
line of text; in an image viewer it might mean 20 pixels.
<p> <li> The <em>slider</em> is the handle that indicates the current value of
the scroll bar, which the user can drag to change the value. This
part of the scroll bar is sometimes called the "thumb".
<p> <li> The <em>page-up/page-down</em> control is the area on which the
slider slides (the scroll bar's background). Clicking here moves
the scroll bar towards the click. The meaning of "page" is also
configurable: in editors and list boxes it means as many lines as
there is space for in the widget.
<p> </ul>
<p> QScrollBar has very few of its own functions; it mostly relies on
<a href="qrangecontrol.html">QRangeControl</a>. The most useful functions are <a href="#setValue">setValue</a>() to set the
scroll bar directly to some value; <a href="qrangecontrol.html#addPage">addPage</a>(), <a href="qrangecontrol.html#addLine">addLine</a>(),
<a href="qrangecontrol.html#subtractPage">subtractPage</a>(), and <a href="qrangecontrol.html#subtractLine">subtractLine</a>() to simulate the effects of
clicking (useful for accelerator keys); <a href="qrangecontrol.html#setSteps">setSteps</a>() to define the
values of <a href="#pageStep">pageStep</a>() and <a href="#lineStep">lineStep</a>(); and <a href="qrangecontrol.html#setRange">setRange</a>() to set the
<a href="#minValue">minValue</a>() and <a href="#maxValue">maxValue</a>() of the scroll bar. QScrollBar has a
convenience constructor with which you can set most of these
properties.
<p> Some GUI styles (for example, the Windows and <a href="motif-extension.html#Motif">Motif</a> styles
provided with Qt), also use the pageStep() value to calculate the
size of the slider.
<p> In addition to the access functions from <a href="qrangecontrol.html">QRangeControl</a>, QScrollBar
provides a comprehensive set of signals:
<center><table cellpadding="4" cellspacing="2" border="0">
<tr bgcolor="#a2c511"> <th valign="top">Signal <th valign="top">Emitted when
<tr bgcolor="#f0f0f0"> <td valign="top"><a href="#valueChanged">valueChanged</a>()
<td valign="top">the scroll bar's value has changed. The <a href="#tracking">tracking</a>()
determines whether this signal is emitted during user
interaction.
<tr bgcolor="#d0d0d0"> <td valign="top"><a href="#sliderPressed">sliderPressed</a>()
<td valign="top">the user starts to drag the slider.
<tr bgcolor="#f0f0f0"> <td valign="top"><a href="#sliderMoved">sliderMoved</a>()
<td valign="top">the user drags the slider.
<tr bgcolor="#d0d0d0"> <td valign="top"><a href="#sliderReleased">sliderReleased</a>()
<td valign="top">the user releases the slider.
<tr bgcolor="#f0f0f0"> <td valign="top"><a href="#nextLine">nextLine</a>()
<td valign="top">the scroll bar has moved one line down or right. Line is
defined in <a href="qrangecontrol.html">QRangeControl</a>.
<tr bgcolor="#d0d0d0"> <td valign="top"><a href="#prevLine">prevLine</a>()
<td valign="top">the scroll bar has moved one line up or left.
<tr bgcolor="#f0f0f0"> <td valign="top"><a href="#nextPage">nextPage</a>()
<td valign="top">the scroll bar has moved one page down or right.
<tr bgcolor="#d0d0d0"> <td valign="top"><a href="#prevPage">prevPage</a>()
<td valign="top">the scroll bar has moved one page up or left.
</table></center>
<p> QScrollBar only provides integer ranges. Note that although
QScrollBar handles very large numbers, scroll bars on current
screens cannot usefully control ranges above about 100,000 pixels.
Beyond that, it becomes difficult for the user to control the
scroll bar using either the keyboard or the mouse.
<p> A scroll bar can be controlled by the keyboard, but it has a
default <a href="qwidget.html#focusPolicy">focusPolicy</a>() of <a href="qwidget.html#FocusPolicy-enum">NoFocus</a>. Use <a href="qwidget.html#setFocusPolicy">setFocusPolicy</a>() to
enable <a href="focus.html#keyboard-focus">keyboard focus</a>. See <a href="qwidget.html#keyPressEvent">keyPressEvent</a>() for a list of key
bindings.
<p> If you need to add scroll bars to an interface, consider using the
<a href="qscrollview.html">QScrollView</a> class, which encapsulates the common uses for scroll
bars.
<p> <img src=qscrbar-m.png> <img src=qscrbar-w.png>
<p> <p>See also <a href="qslider.html">QSlider</a>, <a href="qspinbox.html">QSpinBox</a>, <a href="qscrollview.html">QScrollView</a>, <a href="guibooks.html#fowler">GUI Design Handbook: Scroll Bar</a>, and <a href="basic.html">Basic Widgets</a>.
<hr><h2>Member Function Documentation</h2>
<h3 class=fn><a name="QScrollBar"></a>QScrollBar::QScrollBar ( <a href="qwidget.html">QWidget</a> * parent, const char * name = 0 )
</h3>
Constructs a vertical scroll bar.
<p> The <em>parent</em> and <em>name</em> arguments are sent on to the <a href="qwidget.html">QWidget</a>
constructor.
<p> The <a href="#minValue-prop">minValue</a> defaults to 0, the <a href="#maxValue-prop">maxValue</a> to 99, with a <a href="#lineStep-prop">lineStep</a> size of 1 and a <a href="#pageStep-prop">pageStep</a> size of 10, and an initial
<a href="#value-prop">value</a> of 0.
<h3 class=fn><a name="QScrollBar-2"></a>QScrollBar::QScrollBar ( <a href="qt.html#Orientation-enum">Orientation</a> orientation, <a href="qwidget.html">QWidget</a> * parent, const char * name = 0 )
</h3>
Constructs a scroll bar.
<p> The <em>orientation</em> must be <a href="qt.html#Orientation-enum">Qt::Vertical</a> or <a href="qt.html#Orientation-enum">Qt::Horizontal</a>.
<p> The <em>parent</em> and <em>name</em> arguments are sent on to the <a href="qwidget.html">QWidget</a>
constructor.
<p> The <a href="#minValue-prop">minValue</a> defaults to 0, the <a href="#maxValue-prop">maxValue</a> to 99, with a <a href="#lineStep-prop">lineStep</a> size of 1 and a <a href="#pageStep-prop">pageStep</a> size of 10, and an initial
<a href="#value-prop">value</a> of 0.
<h3 class=fn><a name="QScrollBar-3"></a>QScrollBar::QScrollBar ( int minValue, int maxValue, int lineStep, int pageStep, int value, <a href="qt.html#Orientation-enum">Orientation</a> orientation, <a href="qwidget.html">QWidget</a> * parent, const char * name = 0 )
</h3>
Constructs a scroll bar whose value can never be smaller than <em>minValue</em> or greater than <em>maxValue</em>, whose line step size is <em>lineStep</em> and page step size is <em>pageStep</em> and whose value is
initially <em>value</em> (which is guaranteed to be in range using
<a href="qrangecontrol.html#bound">bound</a>()).
<p> If <em>orientation</em> is <a href="qt.html#Orientation-enum">Vertical</a> the scroll bar is vertical and if
it is <a href="qt.html#Orientation-enum">Horizontal</a> the scroll bar is horizontal.
<p> The <em>parent</em> and <em>name</em> arguments are sent on to the <a href="qwidget.html">QWidget</a>
constructor.
<h3 class=fn><a name="~QScrollBar"></a>QScrollBar::~QScrollBar ()
</h3>
Destructor.
<h3 class=fn>bool <a name="draggingSlider"></a>QScrollBar::draggingSlider () const
</h3><p>Returns TRUE if the user has clicked the mouse on the slider and is currently dragging it; otherwise returns FALSE.
See the <a href="qscrollbar.html#draggingSlider-prop">"draggingSlider"</a> property for details.
<h3 class=fn>void <a name="hideEvent"></a>QScrollBar::hideEvent ( <a href="qhideevent.html">QHideEvent</a> * )<tt> [virtual protected]</tt>
</h3>
This function is called when the scrollbar is hidden.
<p>Reimplemented from <a href="qwidget.html#hideEvent">QWidget</a>.
<h3 class=fn>int <a name="lineStep"></a>QScrollBar::lineStep () const
</h3><p>Returns the line step.
See the <a href="qscrollbar.html#lineStep-prop">"lineStep"</a> property for details.
<h3 class=fn>int <a name="maxValue"></a>QScrollBar::maxValue () const
</h3><p>Returns the scroll bar's maximum value.
See the <a href="qscrollbar.html#maxValue-prop">"maxValue"</a> property for details.
<h3 class=fn>int <a name="minValue"></a>QScrollBar::minValue () const
</h3><p>Returns the scroll bar's minimum value.
See the <a href="qscrollbar.html#minValue-prop">"minValue"</a> property for details.
<h3 class=fn>void <a name="nextLine"></a>QScrollBar::nextLine ()<tt> [signal]</tt>
</h3>
<p> This signal is emitted when the scroll bar scrolls one line down
or right.
<h3 class=fn>void <a name="nextPage"></a>QScrollBar::nextPage ()<tt> [signal]</tt>
</h3>
<p> This signal is emitted when the scroll bar scrolls one page down
or right.
<h3 class=fn><a href="qt.html#Orientation-enum">Orientation</a> <a name="orientation"></a>QScrollBar::orientation () const
</h3><p>Returns the orientation of the scroll bar.
See the <a href="qscrollbar.html#orientation-prop">"orientation"</a> property for details.
<h3 class=fn>int <a name="pageStep"></a>QScrollBar::pageStep () const
</h3><p>Returns the page step.
See the <a href="qscrollbar.html#pageStep-prop">"pageStep"</a> property for details.
<h3 class=fn>void <a name="prevLine"></a>QScrollBar::prevLine ()<tt> [signal]</tt>
</h3>
<p> This signal is emitted when the scroll bar scrolls one line up or
left.
<h3 class=fn>void <a name="prevPage"></a>QScrollBar::prevPage ()<tt> [signal]</tt>
</h3>
<p> This signal is emitted when the scroll bar scrolls one page up or
left.
<h3 class=fn>void <a name="setLineStep"></a>QScrollBar::setLineStep ( int )
</h3><p>Sets the line step.
See the <a href="qscrollbar.html#lineStep-prop">"lineStep"</a> property for details.
<h3 class=fn>void <a name="setMaxValue"></a>QScrollBar::setMaxValue ( int )
</h3><p>Sets the scroll bar's maximum value.
See the <a href="qscrollbar.html#maxValue-prop">"maxValue"</a> property for details.
<h3 class=fn>void <a name="setMinValue"></a>QScrollBar::setMinValue ( int )
</h3><p>Sets the scroll bar's minimum value.
See the <a href="qscrollbar.html#minValue-prop">"minValue"</a> property for details.
<h3 class=fn>void <a name="setOrientation"></a>QScrollBar::setOrientation ( <a href="qt.html#Orientation-enum">Orientation</a> )<tt> [virtual]</tt>
</h3><p>Sets the orientation of the scroll bar.
See the <a href="qscrollbar.html#orientation-prop">"orientation"</a> property for details.
<h3 class=fn>void <a name="setPageStep"></a>QScrollBar::setPageStep ( int )
</h3><p>Sets the page step.
See the <a href="qscrollbar.html#pageStep-prop">"pageStep"</a> property for details.
<h3 class=fn>void <a name="setPalette"></a>QScrollBar::setPalette ( const <a href="qpalette.html">QPalette</a> & p )<tt> [virtual]</tt>
</h3>
Reimplements the virtual function <a href="qwidget.html#setPalette">QWidget::setPalette</a>().
<p> Sets the background color to the mid color for <a href="motif-extension.html#Motif">Motif</a> style scroll
bars using palette <em>p</em>.
<p>Reimplemented from <a href="qwidget.html#setPalette">QWidget</a>.
<h3 class=fn>void <a name="setTracking"></a>QScrollBar::setTracking ( bool enable )<tt> [virtual]</tt>
</h3><p>Sets whether scroll bar tracking is enabled to <em>enable</em>.
See the <a href="qscrollbar.html#tracking-prop">"tracking"</a> property for details.
<h3 class=fn>void <a name="setValue"></a>QScrollBar::setValue ( int )<tt> [slot]</tt>
</h3><p>Sets the scroll bar's value.
See the <a href="qscrollbar.html#value-prop">"value"</a> property for details.
<h3 class=fn>void <a name="sliderMoved"></a>QScrollBar::sliderMoved ( int value )<tt> [signal]</tt>
</h3>
<p> This signal is emitted when the slider is dragged by the user, with
the new scroll bar <em>value</em> as an argument.
<p> This signal is emitted even when tracking is turned off.
<p> <p>See also <a href="#tracking-prop">tracking</a>, <a href="#valueChanged">valueChanged</a>(), <a href="#nextLine">nextLine</a>(), <a href="#prevLine">prevLine</a>(), <a href="#nextPage">nextPage</a>(), and <a href="#prevPage">prevPage</a>().
<h3 class=fn>void <a name="sliderPressed"></a>QScrollBar::sliderPressed ()<tt> [signal]</tt>
</h3>
<p> This signal is emitted when the user presses the slider with the
mouse.
<h3 class=fn><a href="qrect.html">QRect</a> <a name="sliderRect"></a>QScrollBar::sliderRect () const
</h3>
Returns the scroll bar slider rectangle.
<p> <p>See also <a href="#sliderStart">sliderStart</a>().
<h3 class=fn>void <a name="sliderReleased"></a>QScrollBar::sliderReleased ()<tt> [signal]</tt>
</h3>
<p> This signal is emitted when the user releases the slider with the
mouse.
<h3 class=fn>int <a name="sliderStart"></a>QScrollBar::sliderStart () const
</h3>
<p> Returns the pixel position where the scroll bar slider starts.
<p> This is equivalent to <a href="#sliderRect">sliderRect</a>().<a href="qwidget.html#y">y</a>() for vertical scroll bars or
sliderRect().<a href="qwidget.html#x">x</a>() for horizontal scroll bars.
<h3 class=fn>bool <a name="tracking"></a>QScrollBar::tracking () const
</h3><p>Returns TRUE if scroll bar tracking is enabled; otherwise returns FALSE.
See the <a href="qscrollbar.html#tracking-prop">"tracking"</a> property for details.
<h3 class=fn>int <a name="value"></a>QScrollBar::value () const
</h3><p>Returns the scroll bar's value.
See the <a href="qscrollbar.html#value-prop">"value"</a> property for details.
<h3 class=fn>void <a name="valueChanged"></a>QScrollBar::valueChanged ( int value )<tt> [signal]</tt>
</h3>
<p> This signal is emitted when the scroll bar value has changed, with
the new scroll bar <em>value</em> as an argument.
<hr><h2>Property Documentation</h2>
<h3 class=fn>bool <a name="draggingSlider-prop"></a>draggingSlider</h3>
<p>This property holds whether the user has clicked the mouse on the slider and is currently dragging it.
<p>
<p>Get this property's value with <a href="#draggingSlider">draggingSlider</a>().
<h3 class=fn>int <a name="lineStep-prop"></a>lineStep</h3>
<p>This property holds the line step.
<p>When setting lineStep, the virtual <a href="qrangecontrol.html#stepChange">stepChange</a>() function will be
called if the new line step is different from the previous
setting.
<p> <p>See also <a href="qrangecontrol.html#setSteps">setSteps</a>(), <a href="qrangecontrol.html#pageStep">QRangeControl::pageStep</a>(), and <a href="qrangecontrol.html#setRange">setRange</a>().
<p>Set this property's value with <a href="#setLineStep">setLineStep</a>() and get this property's value with <a href="#lineStep">lineStep</a>().
<h3 class=fn>int <a name="maxValue-prop"></a>maxValue</h3>
<p>This property holds the scroll bar's maximum value.
<p>When setting this property, the <a href="#minValue-prop">QScrollBar::minValue</a> is
adjusted if necessary to ensure that the range remains valid.
<p> <p>See also <a href="qrangecontrol.html#setRange">setRange</a>().
<p>Set this property's value with <a href="#setMaxValue">setMaxValue</a>() and get this property's value with <a href="#maxValue">maxValue</a>().
<h3 class=fn>int <a name="minValue-prop"></a>minValue</h3>
<p>This property holds the scroll bar's minimum value.
<p>When setting this property, the <a href="#maxValue-prop">QScrollBar::maxValue</a> is
adjusted if necessary to ensure that the range remains valid.
<p> <p>See also <a href="qrangecontrol.html#setRange">setRange</a>().
<p>Set this property's value with <a href="#setMinValue">setMinValue</a>() and get this property's value with <a href="#minValue">minValue</a>().
<h3 class=fn><a href="qt.html#Orientation-enum">Orientation</a> <a name="orientation-prop"></a>orientation</h3>
<p>This property holds the orientation of the scroll bar.
<p>The orientation must be <a href="qt.html#Orientation-enum">Qt::Vertical</a> (the default) or <a href="qt.html#Orientation-enum">Qt::Horizontal</a>.
<p>Set this property's value with <a href="#setOrientation">setOrientation</a>() and get this property's value with <a href="#orientation">orientation</a>().
<h3 class=fn>int <a name="pageStep-prop"></a>pageStep</h3>
<p>This property holds the page step.
<p>When setting pageStep, the virtual <a href="qrangecontrol.html#stepChange">stepChange</a>() function will be
called if the new page step is different from the previous
setting.
<p> <p>See also <a href="qrangecontrol.html#setSteps">QRangeControl::setSteps</a>(), <a href="#lineStep-prop">lineStep</a>, and <a href="qrangecontrol.html#setRange">setRange</a>().
<p>Set this property's value with <a href="#setPageStep">setPageStep</a>() and get this property's value with <a href="#pageStep">pageStep</a>().
<h3 class=fn>bool <a name="tracking-prop"></a>tracking</h3>
<p>This property holds whether scroll bar tracking is enabled.
<p>If tracking is enabled (the default), the scroll bar emits the
<a href="#valueChanged">valueChanged</a>() signal while the slider is being dragged. If
tracking is disabled, the scroll bar emits the valueChanged()
signal only when the user releases the mouse button after moving
the slider.
<p>Set this property's value with <a href="#setTracking">setTracking</a>() and get this property's value with <a href="#tracking">tracking</a>().
<h3 class=fn>int <a name="value-prop"></a>value</h3>
<p>This property holds the scroll bar's value.
<p>Set this property's value with <a href="#setValue">setValue</a>() and get this property's value with <a href="#value">value</a>().
<p><p>See also <a href="qrangecontrol.html#value">QRangeControl::value</a>() and <a href="qrangecontrol.html#prevValue">prevValue</a>().
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