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333 lines
20 KiB
333 lines
20 KiB
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/widgets/qlcdnumber.cpp:44 -->
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<title>QLCDNumber 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>QLCDNumber Class Reference</h1>
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<p>The QLCDNumber widget displays a number with LCD-like digits.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qlcdnumber-h.html">qlcdnumber.h</a>></tt>
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<p>Inherits <a href="qframe.html">QFrame</a>.
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<p><a href="qlcdnumber-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="#QLCDNumber"><b>QLCDNumber</b></a> ( QWidget * parent = 0, const char * name = 0 )</li>
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<li class=fn><a href="#QLCDNumber-2"><b>QLCDNumber</b></a> ( uint numDigits, QWidget * parent = 0, const char * name = 0 )</li>
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<li class=fn><a href="#~QLCDNumber"><b>~QLCDNumber</b></a> ()</li>
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<li class=fn>enum <a href="#Mode-enum"><b>Mode</b></a> { Hex, Dec, Oct, Bin, HEX = Hex, DEC = Dec, OCT = Oct, BIN = Bin }</li>
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<li class=fn>enum <a href="#SegmentStyle-enum"><b>SegmentStyle</b></a> { Outline, Filled, Flat }</li>
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<li class=fn>bool <a href="#smallDecimalPoint"><b>smallDecimalPoint</b></a> () const</li>
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<li class=fn>int <a href="#numDigits"><b>numDigits</b></a> () const</li>
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<li class=fn>virtual void <a href="#setNumDigits"><b>setNumDigits</b></a> ( int nDigits )</li>
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<li class=fn>bool <a href="#checkOverflow"><b>checkOverflow</b></a> ( double num ) const</li>
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<li class=fn>bool <a href="#checkOverflow-2"><b>checkOverflow</b></a> ( int num ) const</li>
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<li class=fn>Mode <a href="#mode"><b>mode</b></a> () const</li>
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<li class=fn>virtual void <a href="#setMode"><b>setMode</b></a> ( Mode )</li>
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<li class=fn>SegmentStyle <a href="#segmentStyle"><b>segmentStyle</b></a> () const</li>
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<li class=fn>virtual void <a href="#setSegmentStyle"><b>setSegmentStyle</b></a> ( SegmentStyle )</li>
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<li class=fn>double <a href="#value"><b>value</b></a> () const</li>
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<li class=fn>int <a href="#intValue"><b>intValue</b></a> () const</li>
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</ul>
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<h2>Public Slots</h2>
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<ul>
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<li class=fn>void <a href="#display"><b>display</b></a> ( const QString & s )</li>
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<li class=fn>void <a href="#display-2"><b>display</b></a> ( int num )</li>
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<li class=fn>void <a href="#display-3"><b>display</b></a> ( double num )</li>
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<li class=fn>virtual void <a href="#setHexMode"><b>setHexMode</b></a> ()</li>
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<li class=fn>virtual void <a href="#setDecMode"><b>setDecMode</b></a> ()</li>
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<li class=fn>virtual void <a href="#setOctMode"><b>setOctMode</b></a> ()</li>
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<li class=fn>virtual void <a href="#setBinMode"><b>setBinMode</b></a> ()</li>
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<li class=fn>virtual void <a href="#setSmallDecimalPoint"><b>setSmallDecimalPoint</b></a> ( bool )</li>
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</ul>
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<h2>Signals</h2>
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<ul>
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<li class=fn>void <a href="#overflow"><b>overflow</b></a> ()</li>
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</ul>
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<h2>Properties</h2>
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<ul>
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<li class=fn>int <a href="#intValue-prop"><b>intValue</b></a> - the displayed value rounded to the nearest integer</li>
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<li class=fn>Mode <a href="#mode-prop"><b>mode</b></a> - the current display mode (number base)</li>
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<li class=fn>int <a href="#numDigits-prop"><b>numDigits</b></a> - the current number of digits displayed</li>
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<li class=fn>SegmentStyle <a href="#segmentStyle-prop"><b>segmentStyle</b></a> - the style of the LCDNumber</li>
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<li class=fn>bool <a href="#smallDecimalPoint-prop"><b>smallDecimalPoint</b></a> - the style of the decimal point</li>
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<li class=fn>double <a href="#value-prop"><b>value</b></a> - the displayed value</li>
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</ul>
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<h2>Protected Members</h2>
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<ul>
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<li class=fn>virtual void <a href="#drawContents"><b>drawContents</b></a> ( QPainter * p )</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 QLCDNumber widget displays a number with LCD-like digits.
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<p>
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<p> It can display a number in just about any size. It can display
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decimal, hexadecimal, octal or binary numbers. It is easy to
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connect to data sources using the <a href="#display">display</a>() slot, which is
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overloaded to take any of five argument types.
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<p> There are also slots to change the base with <a href="#setMode">setMode</a>() and the
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decimal point with <a href="#setSmallDecimalPoint">setSmallDecimalPoint</a>().
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<p> QLCDNumber emits the <a href="#overflow">overflow</a>() signal when it is asked to display
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something beyond its range. The range is set by <a href="#setNumDigits">setNumDigits</a>(),
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but setSmallDecimalPoint() also influences it. If the display is
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set to hexadecimal, octal or binary, the integer equivalent of the
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value is displayed.
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<p> These digits and other symbols can be shown: 0/O, 1, 2, 3, 4, 5/S,
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6, 7, 8, 9/g, minus, decimal point, A, B, C, D, E, F, h, H, L, o,
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P, r, u, U, Y, colon, degree sign (which is specified as single
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quote in the string) and space. QLCDNumber substitutes spaces for
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illegal characters.
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<p> It is not possible to retrieve the contents of a QLCDNumber
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object, although you can retrieve the numeric value with <a href="#value">value</a>().
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If you really need the text, we recommend that you connect the
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signals that feed the <a href="#display">display</a>() slot to another slot as well and
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store the value there.
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<p> Incidentally, QLCDNumber is the very oldest part of Qt, tracing
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back to a BASIC program on the <a href="http://www.nvg.ntnu.no/sinclair/computers/zxspectrum/zxspectrum.htm">Sinclair Spectrum</a>.
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<p> <img src=qlcdnum-m.png> <img src=qlcdnum-w.png>
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<p> <p>See also <a href="qlabel.html">QLabel</a>, <a href="qframe.html">QFrame</a>, and <a href="basic.html">Basic Widgets</a>.
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<hr><h2>Member Type Documentation</h2>
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<h3 class=fn><a name="Mode-enum"></a>QLCDNumber::Mode</h3>
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<p> This type determines how numbers are shown.
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<ul>
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<li><tt>QLCDNumber::Hex</tt> - Hexadecimal
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<li><tt>QLCDNumber::Dec</tt> - Decimal
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<li><tt>QLCDNumber::Oct</tt> - Octal
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<li><tt>QLCDNumber::Bin</tt> - Binary
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</ul><p> If the display is set to hexadecimal, octal or binary, the integer
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equivalent of the value is displayed.
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<h3 class=fn><a name="SegmentStyle-enum"></a>QLCDNumber::SegmentStyle</h3>
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<p> This type determines the visual appearance of the QLCDNumber
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widget.
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<ul>
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<li><tt>QLCDNumber::Outline</tt> - gives raised segments filled with the background brush.
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<li><tt>QLCDNumber::Filled</tt> - gives raised segments filled with the foreground brush.
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<li><tt>QLCDNumber::Flat</tt> - gives flat segments filled with the foreground brush.
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</ul>
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="QLCDNumber"></a>QLCDNumber::QLCDNumber ( <a href="qwidget.html">QWidget</a> * parent = 0, const char * name = 0 )
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</h3>
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Constructs an LCD number, sets the number of digits to 5, the base
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to decimal, the decimal point mode to 'small' and the frame style
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to a raised box. The <a href="#segmentStyle">segmentStyle</a>() is set to <a href="#SegmentStyle-enum">Outline</a>.
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<p> The <em>parent</em> and <em>name</em> arguments are passed to the <a href="qframe.html">QFrame</a>
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constructor.
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<p> <p>See also <a href="#numDigits-prop">numDigits</a> and <a href="#smallDecimalPoint-prop">smallDecimalPoint</a>.
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<h3 class=fn><a name="QLCDNumber-2"></a>QLCDNumber::QLCDNumber ( uint numDigits, <a href="qwidget.html">QWidget</a> * parent = 0, const char * name = 0 )
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</h3>
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Constructs an LCD number, sets the number of digits to <em>numDigits</em>, the base to decimal, the decimal point mode to 'small'
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and the frame style to a raised box. The <a href="#segmentStyle">segmentStyle</a>() is set to
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<a href="#SegmentStyle-enum">Outline</a>.
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<p> The <em>parent</em> and <em>name</em> arguments are passed to the <a href="qframe.html">QFrame</a>
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constructor.
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<p> <p>See also <a href="#numDigits-prop">numDigits</a> and <a href="#smallDecimalPoint-prop">smallDecimalPoint</a>.
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<h3 class=fn><a name="~QLCDNumber"></a>QLCDNumber::~QLCDNumber ()
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</h3>
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Destroys the LCD number.
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<h3 class=fn>bool <a name="checkOverflow"></a>QLCDNumber::checkOverflow ( double num ) const
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</h3>
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Returns TRUE if <em>num</em> is too big to be displayed in its entirety;
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otherwise returns FALSE.
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<p> <p>See also <a href="#display">display</a>(), <a href="#numDigits-prop">numDigits</a>, and <a href="#smallDecimalPoint-prop">smallDecimalPoint</a>.
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<h3 class=fn>bool <a name="checkOverflow-2"></a>QLCDNumber::checkOverflow ( int num ) const
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</h3>
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This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p> Returns TRUE if <em>num</em> is too big to be displayed in its entirety;
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otherwise returns FALSE.
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<p> <p>See also <a href="#display">display</a>(), <a href="#numDigits-prop">numDigits</a>, and <a href="#smallDecimalPoint-prop">smallDecimalPoint</a>.
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<h3 class=fn>void <a name="display"></a>QLCDNumber::display ( const <a href="qstring.html">QString</a> & s )<tt> [slot]</tt>
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</h3>
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Displays the number represented by the string <em>s</em>.
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<p> This version of the function disregards <a href="#mode">mode</a>() and
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<a href="#smallDecimalPoint">smallDecimalPoint</a>().
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<p> These digits and other symbols can be shown: 0/O, 1, 2, 3, 4, 5/S,
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6, 7, 8, 9/g, minus, decimal point, A, B, C, D, E, F, h, H, L, o,
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P, r, u, U, Y, colon, degree sign (which is specified as single
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quote in the string) and space. QLCDNumber substitutes spaces for
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illegal characters.
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<p>Examples: <a href="rangecontrols-example.html#x1384">rangecontrols/rangecontrols.cpp</a>, <a href="tutorial1-12.html#x2386">t12/lcdrange.cpp</a>, <a href="tutorial1-13.html#x2414">t13/gamebrd.cpp</a>, <a href="tutorial1-05.html#x2314">t5/main.cpp</a>, <a href="tutorial1-06.html#x2324">t6/main.cpp</a>, <a href="tutorial1-07.html#x2330">t7/lcdrange.cpp</a>, and <a href="xform-example.html#x1229">xform/xform.cpp</a>.
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<h3 class=fn>void <a name="display-2"></a>QLCDNumber::display ( int num )<tt> [slot]</tt>
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</h3><p>Sets the displayed value rounded to the nearest integer to <em>num</em>.
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See the <a href="qlcdnumber.html#intValue-prop">"intValue"</a> property for details.
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<h3 class=fn>void <a name="display-3"></a>QLCDNumber::display ( double num )<tt> [slot]</tt>
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</h3>
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This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p> Displays the number <em>num</em>.
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<h3 class=fn>void <a name="drawContents"></a>QLCDNumber::drawContents ( <a href="qpainter.html">QPainter</a> * p )<tt> [virtual protected]</tt>
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</h3>
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Draws the LCD number using painter <em>p</em>. This function is called
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from <a href="qframe.html#paintEvent">QFrame::paintEvent</a>().
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<p>Reimplemented from <a href="qframe.html#drawContents">QFrame</a>.
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<h3 class=fn>int <a name="intValue"></a>QLCDNumber::intValue () const
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</h3><p>Returns the displayed value rounded to the nearest integer.
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See the <a href="qlcdnumber.html#intValue-prop">"intValue"</a> property for details.
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<h3 class=fn><a href="qlcdnumber.html#Mode-enum">Mode</a> <a name="mode"></a>QLCDNumber::mode () const
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</h3><p>Returns the current display mode (number base).
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See the <a href="qlcdnumber.html#mode-prop">"mode"</a> property for details.
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<h3 class=fn>int <a name="numDigits"></a>QLCDNumber::numDigits () const
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</h3><p>Returns the current number of digits displayed.
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See the <a href="qlcdnumber.html#numDigits-prop">"numDigits"</a> property for details.
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<h3 class=fn>void <a name="overflow"></a>QLCDNumber::overflow ()<tt> [signal]</tt>
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</h3>
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<p> This signal is emitted whenever the QLCDNumber is asked to display
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a too-large number or a too-long string.
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<p> It is never emitted by <a href="#setNumDigits">setNumDigits</a>().
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<h3 class=fn><a href="qlcdnumber.html#SegmentStyle-enum">SegmentStyle</a> <a name="segmentStyle"></a>QLCDNumber::segmentStyle () const
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</h3><p>Returns the style of the LCDNumber.
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See the <a href="qlcdnumber.html#segmentStyle-prop">"segmentStyle"</a> property for details.
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<h3 class=fn>void <a name="setBinMode"></a>QLCDNumber::setBinMode ()<tt> [virtual slot]</tt>
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</h3>
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Calls <a href="#setMode">setMode</a>( BIN ). Provided for convenience (e.g. for
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connecting buttons to it).
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<p> <p>See also <a href="#mode-prop">mode</a>, <a href="#setHexMode">setHexMode</a>(), <a href="#setDecMode">setDecMode</a>(), <a href="#setOctMode">setOctMode</a>(), and <a href="#mode-prop">mode</a>.
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<h3 class=fn>void <a name="setDecMode"></a>QLCDNumber::setDecMode ()<tt> [virtual slot]</tt>
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</h3>
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Calls <a href="#setMode">setMode</a>( DEC ). Provided for convenience (e.g. for
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connecting buttons to it).
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<p> <p>See also <a href="#mode-prop">mode</a>, <a href="#setHexMode">setHexMode</a>(), <a href="#setOctMode">setOctMode</a>(), <a href="#setBinMode">setBinMode</a>(), and <a href="#mode-prop">mode</a>.
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<h3 class=fn>void <a name="setHexMode"></a>QLCDNumber::setHexMode ()<tt> [virtual slot]</tt>
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</h3>
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Calls <a href="#setMode">setMode</a>( HEX ). Provided for convenience (e.g. for
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connecting buttons to it).
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<p> <p>See also <a href="#mode-prop">mode</a>, <a href="#setDecMode">setDecMode</a>(), <a href="#setOctMode">setOctMode</a>(), <a href="#setBinMode">setBinMode</a>(), and <a href="#mode-prop">mode</a>.
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<h3 class=fn>void <a name="setMode"></a>QLCDNumber::setMode ( <a href="qlcdnumber.html#Mode-enum">Mode</a> )<tt> [virtual]</tt>
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</h3><p>Sets the current display mode (number base).
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See the <a href="qlcdnumber.html#mode-prop">"mode"</a> property for details.
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<h3 class=fn>void <a name="setNumDigits"></a>QLCDNumber::setNumDigits ( int nDigits )<tt> [virtual]</tt>
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</h3><p>Sets the current number of digits displayed to <em>nDigits</em>.
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See the <a href="qlcdnumber.html#numDigits-prop">"numDigits"</a> property for details.
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<h3 class=fn>void <a name="setOctMode"></a>QLCDNumber::setOctMode ()<tt> [virtual slot]</tt>
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</h3>
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Calls <a href="#setMode">setMode</a>( OCT ). Provided for convenience (e.g. for
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connecting buttons to it).
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<p> <p>See also <a href="#mode-prop">mode</a>, <a href="#setHexMode">setHexMode</a>(), <a href="#setDecMode">setDecMode</a>(), <a href="#setBinMode">setBinMode</a>(), and <a href="#mode-prop">mode</a>.
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<h3 class=fn>void <a name="setSegmentStyle"></a>QLCDNumber::setSegmentStyle ( <a href="qlcdnumber.html#SegmentStyle-enum">SegmentStyle</a> )<tt> [virtual]</tt>
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</h3><p>Sets the style of the LCDNumber.
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See the <a href="qlcdnumber.html#segmentStyle-prop">"segmentStyle"</a> property for details.
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<h3 class=fn>void <a name="setSmallDecimalPoint"></a>QLCDNumber::setSmallDecimalPoint ( bool )<tt> [virtual slot]</tt>
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</h3><p>Sets the style of the decimal point.
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See the <a href="qlcdnumber.html#smallDecimalPoint-prop">"smallDecimalPoint"</a> property for details.
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<h3 class=fn>bool <a name="smallDecimalPoint"></a>QLCDNumber::smallDecimalPoint () const
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</h3><p>Returns the style of the decimal point.
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See the <a href="qlcdnumber.html#smallDecimalPoint-prop">"smallDecimalPoint"</a> property for details.
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<h3 class=fn>double <a name="value"></a>QLCDNumber::value () const
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</h3><p>Returns the displayed value.
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See the <a href="qlcdnumber.html#value-prop">"value"</a> property for details.
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<hr><h2>Property Documentation</h2>
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<h3 class=fn>int <a name="intValue-prop"></a>intValue</h3>
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<p>This property holds the displayed value rounded to the nearest integer.
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<p>This property corresponds to the nearest integer to the current
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value displayed by the LCDNumber. This is the value used for
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hexadecimal, octal and binary modes.
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<p> If the displayed value is not a number, the property has a value
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of 0.
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<p>Set this property's value with <a href="#display">display</a>() and get this property's value with <a href="#intValue">intValue</a>().
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<h3 class=fn><a href="qlcdnumber.html#Mode-enum">Mode</a> <a name="mode-prop"></a>mode</h3>
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<p>This property holds the current display mode (number base).
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<p>Corresponds to the current display mode, which is one of <a href="#Mode-enum">BIN</a>,
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<a href="#Mode-enum">OCT</a>, <a href="#Mode-enum">DEC</a> (the default) and <a href="#Mode-enum">HEX</a>. <a href="#Mode-enum">DEC</a> mode can display
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floating point values, the other modes display the integer
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equivalent.
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<p> <p>See also <a href="#smallDecimalPoint-prop">smallDecimalPoint</a>, <a href="#setHexMode">setHexMode</a>(), <a href="#setDecMode">setDecMode</a>(), <a href="#setOctMode">setOctMode</a>(), and <a href="#setBinMode">setBinMode</a>().
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<p>Set this property's value with <a href="#setMode">setMode</a>() and get this property's value with <a href="#mode">mode</a>().
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<h3 class=fn>int <a name="numDigits-prop"></a>numDigits</h3>
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<p>This property holds the current number of digits displayed.
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<p>Corresponds to the current number of digits. If <a href="#smallDecimalPoint-prop">QLCDNumber::smallDecimalPoint</a> is FALSE, the decimal point occupies
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one digit position.
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<p> <p>See also <a href="#smallDecimalPoint-prop">smallDecimalPoint</a>.
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<p>Set this property's value with <a href="#setNumDigits">setNumDigits</a>() and get this property's value with <a href="#numDigits">numDigits</a>().
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<h3 class=fn><a href="qlcdnumber.html#SegmentStyle-enum">SegmentStyle</a> <a name="segmentStyle-prop"></a>segmentStyle</h3>
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<p>This property holds the style of the LCDNumber.
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<p><center><table cellpadding="4" cellspacing="2" border="0">
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<tr bgcolor="#a2c511"> <th valign="top">Style <th valign="top">Result
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<tr bgcolor="#f0f0f0"> <td valign="top"><a href="#SegmentStyle-enum">Outline</a>
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<td valign="top">Produces raised segments filled with the background color
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(this is the default).
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<tr bgcolor="#d0d0d0"> <td valign="top"><a href="#SegmentStyle-enum">Filled</a>
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<td valign="top">Produces raised segments filled with the foreground color.
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<tr bgcolor="#f0f0f0"> <td valign="top"><a href="#SegmentStyle-enum">Flat</a>
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<td valign="top">Produces flat segments filled with the foreground color.
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</table></center>
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<p> <a href="#SegmentStyle-enum">Outline</a> and <a href="#SegmentStyle-enum">Filled</a> will additionally use
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<a href="qcolorgroup.html#light">QColorGroup::light</a>() and <a href="qcolorgroup.html#dark">QColorGroup::dark</a>() for shadow effects.
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<p>Set this property's value with <a href="#setSegmentStyle">setSegmentStyle</a>() and get this property's value with <a href="#segmentStyle">segmentStyle</a>().
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<h3 class=fn>bool <a name="smallDecimalPoint-prop"></a>smallDecimalPoint</h3>
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<p>This property holds the style of the decimal point.
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<p>If TRUE the decimal point is drawn between two digit positions.
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Otherwise it occupies a digit position of its own, i.e. is drawn
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in a digit position. The default is FALSE.
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<p> The inter-digit space is made slightly wider when the decimal
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point is drawn between the digits.
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<p> <p>See also <a href="#mode-prop">mode</a>.
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<p>Set this property's value with <a href="#setSmallDecimalPoint">setSmallDecimalPoint</a>() and get this property's value with <a href="#smallDecimalPoint">smallDecimalPoint</a>().
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<h3 class=fn>double <a name="value-prop"></a>value</h3>
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<p>This property holds the displayed value.
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<p>This property corresponds to the current value displayed by the
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LCDNumber.
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<p> If the displayed value is not a number, the property has a value
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of 0.
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<p>Set this property's value with <a href="#display">display</a>() and get this property's value with <a href="#value">value</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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</table></div></address></body>
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</html>
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