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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>TQDial Class Reference</h1>

<p>The TQDial class provides a rounded range control (like a speedometer or potentiometer).
<a href="#details">More...</a>
<p><tt>#include &lt;<a href="qdial-h.html">ntqdial.h</a>&gt;</tt>
<p>Inherits <a href="tqwidget.html">TQWidget</a> and <a href="ntqrangecontrol.html">TQRangeControl</a>.
<p><a href="qdial-members.html">List of all member functions.</a>
<h2>Public Members</h2>
<ul>
<li class=fn><a href="#TQDial"><b>TQDial</b></a> ( TQWidget&nbsp;*&nbsp;parent = 0, const&nbsp;char&nbsp;*&nbsp;name = 0, WFlags&nbsp;f = 0 )</li>
<li class=fn><a href="#TQDial-2"><b>TQDial</b></a> ( int&nbsp;minValue, int&nbsp;maxValue, int&nbsp;pageStep, int&nbsp;value, TQWidget&nbsp;*&nbsp;parent = 0, const&nbsp;char&nbsp;*&nbsp;name = 0 )</li>
<li class=fn><a href="#~TQDial"><b>~TQDial</b></a> ()</li>
<li class=fn>bool <a href="#tracking"><b>tracking</b></a> () const</li>
<li class=fn>bool <a href="#wrapping"><b>wrapping</b></a> () const</li>
<li class=fn>int <a href="#notchSize"><b>notchSize</b></a> () const</li>
<li class=fn>virtual void <a href="#setNotchTarget"><b>setNotchTarget</b></a> ( double )</li>
<li class=fn>double <a href="#notchTarget"><b>notchTarget</b></a> () const</li>
<li class=fn>bool <a href="#notchesVisible"><b>notchesVisible</b></a> () const</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>
</ul>
<h2>Public Slots</h2>
<ul>
<li class=fn>virtual void <a href="#setValue"><b>setValue</b></a> ( int )</li>
<li class=fn>void <a href="#addLine"><b>addLine</b></a> ()</li>
<li class=fn>void <a href="#subtractLine"><b>subtractLine</b></a> ()</li>
<li class=fn>void <a href="#addPage"><b>addPage</b></a> ()</li>
<li class=fn>void <a href="#subtractPage"><b>subtractPage</b></a> ()</li>
<li class=fn>virtual void <a href="#setNotchesVisible"><b>setNotchesVisible</b></a> ( bool&nbsp;b )</li>
<li class=fn>virtual void <a href="#setWrapping"><b>setWrapping</b></a> ( bool&nbsp;on )</li>
<li class=fn>virtual void <a href="#setTracking"><b>setTracking</b></a> ( bool&nbsp;enable )</li>
</ul>
<h2>Signals</h2>
<ul>
<li class=fn>void <a href="#valueChanged"><b>valueChanged</b></a> ( int&nbsp;value )</li>
<li class=fn>void <a href="#dialPressed"><b>dialPressed</b></a> ()</li>
<li class=fn>void <a href="#dialMoved"><b>dialMoved</b></a> ( int&nbsp;value )</li>
<li class=fn>void <a href="#dialReleased"><b>dialReleased</b></a> ()</li>
</ul>
<h2>Properties</h2>
<ul>
<li class=fn>int <a href="#lineStep-prop"><b>lineStep</b></a>&nbsp;- the current line step</li>
<li class=fn>int <a href="#maxValue-prop"><b>maxValue</b></a>&nbsp;- the current maximum value</li>
<li class=fn>int <a href="#minValue-prop"><b>minValue</b></a>&nbsp;- the current minimum value</li>
<li class=fn>int <a href="#notchSize-prop"><b>notchSize</b></a>&nbsp;- the current notch size &nbsp;<em>(read only)</em></li>
<li class=fn>double <a href="#notchTarget-prop"><b>notchTarget</b></a>&nbsp;- the target number of pixels between notches</li>
<li class=fn>bool <a href="#notchesVisible-prop"><b>notchesVisible</b></a>&nbsp;- whether the notches are shown</li>
<li class=fn>int <a href="#pageStep-prop"><b>pageStep</b></a>&nbsp;- the current page step</li>
<li class=fn>bool <a href="#tracking-prop"><b>tracking</b></a>&nbsp;- whether tracking is enabled</li>
<li class=fn>int <a href="#value-prop"><b>value</b></a>&nbsp;- the current dial value</li>
<li class=fn>bool <a href="#wrapping-prop"><b>wrapping</b></a>&nbsp;- whether wrapping is enabled</li>
</ul>
<h2>Protected Members</h2>
<ul>
<li class=fn>virtual void <a href="#valueChange"><b>valueChange</b></a> ()</li>
<li class=fn>virtual void <a href="#rangeChange"><b>rangeChange</b></a> ()</li>
<li class=fn>virtual void <a href="#repaintScreen"><b>repaintScreen</b></a> ( const&nbsp;TQRect&nbsp;*&nbsp;cr = 0 )</li>
</ul>
<hr><a name="details"></a><h2>Detailed Description</h2>


<p> The TQDial class provides a rounded range control (like a speedometer or potentiometer).
<p> 

<p> TQDial is used when the user needs to control a value within a
program-definable range, and the range either wraps around
(typically, 0..359 degrees) or the dialog layout needs a square
widget.
<p> Both API- and UI-wise, the dial is very similar to a <a href="ntqslider.html">slider.</a> Indeed, when <a href="#wrapping">wrapping</a>() is FALSE (the default)
there is no real difference between a slider and a dial. They
have the same signals, slots and member functions, all of which do
the same things. Which one you use depends only on your taste
and on the application.
<p> The dial initially emits <a href="#valueChanged">valueChanged</a>() signals continuously while
the slider is being moved; you can make it emit the signal less
often by calling <a href="#setTracking">setTracking</a>(FALSE). <a href="#dialMoved">dialMoved</a>() is emitted
continuously even when <a href="#tracking">tracking</a>() is FALSE.
<p> The slider also emits <a href="#dialPressed">dialPressed</a>() and <a href="#dialReleased">dialReleased</a>() signals
when the mouse button is pressed and released. But note that the
dial's value can change without these signals being emitted; the
keyboard and wheel can be used to change the value.
<p> Unlike the slider, TQDial attempts to draw a "nice" number of
notches rather than one per <a href="#lineStep">lineStep</a>(). If possible, the number
of notches drawn is one per lineStep(), but if there aren't enough
pixels to draw every one, TQDial will draw every second, third
etc., notch. <a href="#notchSize">notchSize</a>() returns the number of units per notch,
hopefully a multiple of lineStep(); <a href="#setNotchTarget">setNotchTarget</a>() sets the
target distance between neighbouring notches in pixels. The
default is 3.75 pixels.
<p> Like the slider, the dial makes the <a href="ntqrangecontrol.html">TQRangeControl</a> functions
<a href="#setValue">setValue</a>(), <a href="#addLine">addLine</a>(), <a href="#subtractLine">subtractLine</a>(), <a href="#addPage">addPage</a>() and
<a href="#subtractPage">subtractPage</a>() available as slots.
<p> The dial's keyboard interface is fairly simple: The left/up and
right/down arrow keys move by lineStep(), page up and page down by
<a href="#pageStep">pageStep</a>() and Home and End to <a href="#minValue">minValue</a>() and <a href="#maxValue">maxValue</a>().
<p> <img src=qdial-m.png> <img src=qdial-w.png>
<p> <p>See also <a href="ntqscrollbar.html">TQScrollBar</a>, <a href="ntqspinbox.html">TQSpinBox</a>, <a href="guibooks.html#fowler">GUI Design Handbook: Slider</a>, and <a href="basic.html">Basic Widgets</a>.

<hr><h2>Member Function Documentation</h2>
<h3 class=fn><a name="TQDial"></a>TQDial::TQDial ( <a href="tqwidget.html">TQWidget</a>&nbsp;*&nbsp;parent = 0, const&nbsp;char&nbsp;*&nbsp;name = 0, WFlags&nbsp;f = 0 )
</h3>
Constructs a dial called <em>name</em> with parent <em>parent</em>. <em>f</em> is
propagated to the <a href="tqwidget.html">TQWidget</a> constructor. It has the default range of
a <a href="ntqrangecontrol.html">TQRangeControl</a>.

<h3 class=fn><a name="TQDial-2"></a>TQDial::TQDial ( int&nbsp;minValue, int&nbsp;maxValue, int&nbsp;pageStep, int&nbsp;value, <a href="tqwidget.html">TQWidget</a>&nbsp;*&nbsp;parent = 0, const&nbsp;char&nbsp;*&nbsp;name = 0 )
</h3>
Constructs a dial called <em>name</em> with parent <em>parent</em>. The dial's
value can never be smaller than <em>minValue</em> or greater than <em>maxValue</em>. Its page step size is <em>pageStep</em>, and its initial value
is <em>value</em>.
<p> <em>value</em> is forced to be within the legal range.

<h3 class=fn><a name="~TQDial"></a>TQDial::~TQDial ()
</h3>
Destroys the dial.

<h3 class=fn>void <a name="addLine"></a>TQDial::addLine ()<tt> [slot]</tt>
</h3>
Increments the dial's <a href="#value">value</a>() by one <a href="#lineStep">lineStep</a>().

<h3 class=fn>void <a name="addPage"></a>TQDial::addPage ()<tt> [slot]</tt>
</h3>
Increments the dial's <a href="#value">value</a>() by one <a href="#pageStep">pageStep</a>() of steps.

<h3 class=fn>void <a name="dialMoved"></a>TQDial::dialMoved ( int&nbsp;value )<tt> [signal]</tt>
</h3>

<p> This signal is emitted whenever the dial <em>value</em> changes. The
frequency of this signal is <em>not</em> influenced by <a href="#setTracking">setTracking</a>().
<p> <p>See also <a href="#valueChanged">valueChanged</a>().

<h3 class=fn>void <a name="dialPressed"></a>TQDial::dialPressed ()<tt> [signal]</tt>
</h3>

<p> This signal is emitted when the user begins mouse interaction with
the dial.
<p> <p>See also <a href="#dialReleased">dialReleased</a>().

<h3 class=fn>void <a name="dialReleased"></a>TQDial::dialReleased ()<tt> [signal]</tt>
</h3>

<p> This signal is emitted when the user ends mouse interaction with
the dial.
<p> <p>See also <a href="#dialPressed">dialPressed</a>().

<h3 class=fn>int <a name="lineStep"></a>TQDial::lineStep () const
</h3><p>Returns the current line step.
See the <a href="ntqdial.html#lineStep-prop">"lineStep"</a> property for details.
<h3 class=fn>int <a name="maxValue"></a>TQDial::maxValue () const
</h3><p>Returns the current maximum value.
See the <a href="ntqdial.html#maxValue-prop">"maxValue"</a> property for details.
<h3 class=fn>int <a name="minValue"></a>TQDial::minValue () const
</h3><p>Returns the current minimum value.
See the <a href="ntqdial.html#minValue-prop">"minValue"</a> property for details.
<h3 class=fn>int <a name="notchSize"></a>TQDial::notchSize () const
</h3><p>Returns the current notch size.
See the <a href="ntqdial.html#notchSize-prop">"notchSize"</a> property for details.
<h3 class=fn>double <a name="notchTarget"></a>TQDial::notchTarget () const
</h3><p>Returns the target number of pixels between notches.
See the <a href="ntqdial.html#notchTarget-prop">"notchTarget"</a> property for details.
<h3 class=fn>bool <a name="notchesVisible"></a>TQDial::notchesVisible () const
</h3><p>Returns TRUE if the notches are shown; otherwise returns FALSE.
See the <a href="ntqdial.html#notchesVisible-prop">"notchesVisible"</a> property for details.
<h3 class=fn>int <a name="pageStep"></a>TQDial::pageStep () const
</h3><p>Returns the current page step.
See the <a href="ntqdial.html#pageStep-prop">"pageStep"</a> property for details.
<h3 class=fn>void <a name="rangeChange"></a>TQDial::rangeChange ()<tt> [virtual protected]</tt>
</h3>
Reimplemented to ensure tick-marks are consistent with the new range.

<p>Reimplemented from <a href="ntqrangecontrol.html#rangeChange">TQRangeControl</a>.
<h3 class=fn>void <a name="repaintScreen"></a>TQDial::repaintScreen ( const&nbsp;<a href="ntqrect.html">TQRect</a>&nbsp;*&nbsp;cr = 0 )<tt> [virtual protected]</tt>
</h3>
Paints the dial using clip region <em>cr</em>.

<h3 class=fn>void <a name="setLineStep"></a>TQDial::setLineStep ( int )
</h3><p>Sets the current line step.
See the <a href="ntqdial.html#lineStep-prop">"lineStep"</a> property for details.
<h3 class=fn>void <a name="setMaxValue"></a>TQDial::setMaxValue ( int )
</h3><p>Sets the current maximum value.
See the <a href="ntqdial.html#maxValue-prop">"maxValue"</a> property for details.
<h3 class=fn>void <a name="setMinValue"></a>TQDial::setMinValue ( int )
</h3><p>Sets the current minimum value.
See the <a href="ntqdial.html#minValue-prop">"minValue"</a> property for details.
<h3 class=fn>void <a name="setNotchTarget"></a>TQDial::setNotchTarget ( double )<tt> [virtual]</tt>
</h3><p>Sets the target number of pixels between notches.
See the <a href="ntqdial.html#notchTarget-prop">"notchTarget"</a> property for details.
<h3 class=fn>void <a name="setNotchesVisible"></a>TQDial::setNotchesVisible ( bool&nbsp;b )<tt> [virtual slot]</tt>
</h3><p>Sets whether the notches are shown to <em>b</em>.
See the <a href="ntqdial.html#notchesVisible-prop">"notchesVisible"</a> property for details.
<h3 class=fn>void <a name="setPageStep"></a>TQDial::setPageStep ( int )
</h3><p>Sets the current page step.
See the <a href="ntqdial.html#pageStep-prop">"pageStep"</a> property for details.
<h3 class=fn>void <a name="setTracking"></a>TQDial::setTracking ( bool&nbsp;enable )<tt> [virtual slot]</tt>
</h3><p>Sets whether tracking is enabled to <em>enable</em>.
See the <a href="ntqdial.html#tracking-prop">"tracking"</a> property for details.
<h3 class=fn>void <a name="setValue"></a>TQDial::setValue ( int )<tt> [virtual slot]</tt>
</h3><p>Sets the current dial value.
See the <a href="ntqdial.html#value-prop">"value"</a> property for details.
<h3 class=fn>void <a name="setWrapping"></a>TQDial::setWrapping ( bool&nbsp;on )<tt> [virtual slot]</tt>
</h3><p>Sets whether wrapping is enabled to <em>on</em>.
See the <a href="ntqdial.html#wrapping-prop">"wrapping"</a> property for details.
<h3 class=fn>void <a name="subtractLine"></a>TQDial::subtractLine ()<tt> [slot]</tt>
</h3>
Decrements the dial's <a href="#value">value</a>() by one <a href="#lineStep">lineStep</a>().

<h3 class=fn>void <a name="subtractPage"></a>TQDial::subtractPage ()<tt> [slot]</tt>
</h3>
Decrements the dial's <a href="#value">value</a>() by one <a href="#pageStep">pageStep</a>() of steps.

<h3 class=fn>bool <a name="tracking"></a>TQDial::tracking () const
</h3><p>Returns TRUE if tracking is enabled; otherwise returns FALSE.
See the <a href="ntqdial.html#tracking-prop">"tracking"</a> property for details.
<h3 class=fn>int <a name="value"></a>TQDial::value () const
</h3><p>Returns the current dial value.
See the <a href="ntqdial.html#value-prop">"value"</a> property for details.
<h3 class=fn>void <a name="valueChange"></a>TQDial::valueChange ()<tt> [virtual protected]</tt>
</h3>
Reimplemented to ensure the display is correct and to emit the
<a href="#valueChanged">valueChanged</a>(int) signal when appropriate.

<p>Reimplemented from <a href="ntqrangecontrol.html#valueChange">TQRangeControl</a>.
<h3 class=fn>void <a name="valueChanged"></a>TQDial::valueChanged ( int&nbsp;value )<tt> [signal]</tt>
</h3>

<p> This signal is emitted whenever the dial's <em>value</em> changes. The
frequency of this signal is influenced by <a href="#setTracking">setTracking</a>().

<h3 class=fn>bool <a name="wrapping"></a>TQDial::wrapping () const
</h3><p>Returns TRUE if wrapping is enabled; otherwise returns FALSE.
See the <a href="ntqdial.html#wrapping-prop">"wrapping"</a> property for details.
<hr><h2>Property Documentation</h2>
<h3 class=fn>int <a name="lineStep-prop"></a>lineStep</h3>
<p>This property holds the current line step.
<p>setLineStep() calls the virtual <a href="ntqrangecontrol.html#stepChange">stepChange</a>() function if the new
line step is different from the previous setting.
<p> <p>See also <a href="ntqrangecontrol.html#setSteps">TQRangeControl::setSteps</a>(), <a href="#pageStep-prop">pageStep</a>, and <a href="ntqrangecontrol.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 current maximum value.
<p>When setting this property, the <a href="#minValue-prop">TQDial::minValue</a> is adjusted if
necessary to ensure that the range remains valid.
<p> <p>See also <a href="ntqrangecontrol.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 current minimum value.
<p>When setting this property, the <a href="#maxValue-prop">TQDial::maxValue</a> is adjusted if
necessary to ensure that the range remains valid.
<p> <p>See also <a href="ntqrangecontrol.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>int <a name="notchSize-prop"></a>notchSize</h3>
<p>This property holds the current notch size.
<p>The notch size is in range control units, not pixels, and if
possible it is a multiple of <a href="#lineStep">lineStep</a>() that results in an
on-screen notch size near <a href="#notchTarget">notchTarget</a>().
<p> <p>See also <a href="#notchTarget-prop">notchTarget</a> and <a href="#lineStep-prop">lineStep</a>.

<p>Get this property's value with <a href="#notchSize">notchSize</a>().
<h3 class=fn>double <a name="notchTarget-prop"></a>notchTarget</h3>
<p>This property holds the target number of pixels between notches.
<p>The notch target is the number of pixels TQDial attempts to put
between each notch.
<p> The actual size may differ from the target size.

<p>Set this property's value with <a href="#setNotchTarget">setNotchTarget</a>() and get this property's value with <a href="#notchTarget">notchTarget</a>().
<h3 class=fn>bool <a name="notchesVisible-prop"></a>notchesVisible</h3>
<p>This property holds whether the notches are shown.
<p>If TRUE, the notches are shown. If FALSE (the default) notches are
not shown.

<p>Set this property's value with <a href="#setNotchesVisible">setNotchesVisible</a>() and get this property's value with <a href="#notchesVisible">notchesVisible</a>().
<h3 class=fn>int <a name="pageStep-prop"></a>pageStep</h3>
<p>This property holds the current page step.
<p>setPageStep() calls the virtual <a href="ntqrangecontrol.html#stepChange">stepChange</a>() function if the new
page step is different from the previous setting.
<p> <p>See also <a href="ntqrangecontrol.html#stepChange">stepChange</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 tracking is enabled.
<p>If TRUE (the default), tracking is enabled. This means that the
arrow can be moved using the mouse; otherwise the arrow cannot be
moved with the mouse.

<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 current dial value.
<p>This is guaranteed to be within the range
<a href="#minValue-prop">TQDial::minValue</a>..<a href="#maxValue-prop">TQDial::maxValue</a>.
<p> <p>See also <a href="#minValue-prop">minValue</a> and <a href="#maxValue-prop">maxValue</a>.

<p>Set this property's value with <a href="#setValue">setValue</a>() and get this property's value with <a href="#value">value</a>().
<h3 class=fn>bool <a name="wrapping-prop"></a>wrapping</h3>
<p>This property holds whether wrapping is enabled.
<p>If TRUE, wrapping is enabled. This means that the arrow can be
turned around 360°. Otherwise there is some space at the bottom of
the dial which is skipped by the arrow.
<p> This property's default is FALSE.

<p>Set this property's value with <a href="#setWrapping">setWrapping</a>() and get this property's value with <a href="#wrapping">wrapping</a>().
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