qdial.html

QT 下载资料仅供参考

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

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

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

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

<p>Reimplemented from <a href="qrangecontrol.html#rangeChange">QRangeControl</a>.
<h3 class=fn>void <a name="repaintScreen"></a>QDial::repaintScreen ( const&nbsp;<a href="qrect.html">QRect</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>QDial::setLineStep ( int )
</h3><p>Sets the current line step.
See the <a href="qdial.html#lineStep-prop">"lineStep"</a> property for details.
<h3 class=fn>void <a name="setMaxValue"></a>QDial::setMaxValue ( int )
</h3><p>Sets the current maximum value.
See the <a href="qdial.html#maxValue-prop">"maxValue"</a> property for details.
<h3 class=fn>void <a name="setMinValue"></a>QDial::setMinValue ( int )
</h3><p>Sets the current minimum value.
See the <a href="qdial.html#minValue-prop">"minValue"</a> property for details.
<h3 class=fn>void <a name="setNotchTarget"></a>QDial::setNotchTarget ( double )<tt> [virtual]</tt>
</h3><p>Sets the target number of pixels between notches.
See the <a href="qdial.html#notchTarget-prop">"notchTarget"</a> property for details.
<h3 class=fn>void <a name="setNotchesVisible"></a>QDial::setNotchesVisible ( bool&nbsp;b )<tt> [virtual slot]</tt>
</h3><p>Sets whether the notches are shown to <em>b</em>.
See the <a href="qdial.html#notchesVisible-prop">"notchesVisible"</a> property for details.
<h3 class=fn>void <a name="setPageStep"></a>QDial::setPageStep ( int )
</h3><p>Sets the current page step.
See the <a href="qdial.html#pageStep-prop">"pageStep"</a> property for details.
<h3 class=fn>void <a name="setTracking"></a>QDial::setTracking ( bool&nbsp;enable )<tt> [virtual slot]</tt>
</h3><p>Sets whether tracking is enabled to <em>enable</em>.
See the <a href="qdial.html#tracking-prop">"tracking"</a> property for details.
<h3 class=fn>void <a name="setValue"></a>QDial::setValue ( int )<tt> [virtual slot]</tt>
</h3><p>Sets the current dial value.
See the <a href="qdial.html#value-prop">"value"</a> property for details.
<h3 class=fn>void <a name="setWrapping"></a>QDial::setWrapping ( bool&nbsp;on )<tt> [virtual slot]</tt>
</h3><p>Sets whether wrapping is enabled to <em>on</em>.
See the <a href="qdial.html#wrapping-prop">"wrapping"</a> property for details.
<h3 class=fn>void <a name="subtractLine"></a>QDial::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>QDial::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>QDial::tracking () const
</h3><p>Returns TRUE if tracking is enabled; otherwise returns FALSE.
See the <a href="qdial.html#tracking-prop">"tracking"</a> property for details.
<h3 class=fn>int <a name="value"></a>QDial::value () const
</h3><p>Returns the current dial value.
See the <a href="qdial.html#value-prop">"value"</a> property for details.
<h3 class=fn>void <a name="valueChange"></a>QDial::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="qrangecontrol.html#valueChange">QRangeControl</a>.
<h3 class=fn>void <a name="valueChanged"></a>QDial::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>QDial::wrapping () const
</h3><p>Returns TRUE if wrapping is enabled; otherwise returns FALSE.
See the <a href="qdial.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="qrangecontrol.html#stepChange">stepChange</a>() function if the new line
step is different from the previous setting.
<p> <p>See also <a href="qrangecontrol.html#setSteps">QRangeControl::setSteps</a>(), <a href="#pageStep-prop">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 current maximum value.
<p>When setting this property, the <a href="#minValue-prop">QDial::minValue</a> is adjusted so that the
range remains valid if necessary.
<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 current minimum value.
<p>When setting this property, the <a href="#maxValue-prop">QDial::maxValue</a> is adjusted so that the
range remains valid if necessary.
<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>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 QDial 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="qrangecontrol.html#stepChange">stepChange</a>() function if the new page
step is different from the previous setting.
<p> <p>See also <a href="qrangecontrol.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">QDial::minValue</a>..<a href="#maxValue-prop">QDial::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