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337 lines
19 KiB
337 lines
19 KiB
14 years ago
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/widgets/qrangecontrol.cpp:46 -->
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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>QRangeControl Class Reference</h1>
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<p>The QRangeControl class provides an integer value within a range.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qrangecontrol-h.html">qrangecontrol.h</a>></tt>
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<p>Inherited by <a href="qdial.html">QDial</a>, <a href="qscrollbar.html">QScrollBar</a>, <a href="qslider.html">QSlider</a>, and <a href="qspinbox.html">QSpinBox</a>.
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<p><a href="qrangecontrol-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="#QRangeControl"><b>QRangeControl</b></a> ()</li>
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<li class=fn><a href="#QRangeControl-2"><b>QRangeControl</b></a> ( int minValue, int maxValue, int lineStep, int pageStep, int value )</li>
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<li class=fn>virtual <a href="#~QRangeControl"><b>~QRangeControl</b></a> ()</li>
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<li class=fn>int <a href="#value"><b>value</b></a> () const</li>
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<li class=fn>void <a href="#setValue"><b>setValue</b></a> ( int value )</li>
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<li class=fn>void <a href="#addPage"><b>addPage</b></a> ()</li>
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<li class=fn>void <a href="#subtractPage"><b>subtractPage</b></a> ()</li>
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<li class=fn>void <a href="#addLine"><b>addLine</b></a> ()</li>
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<li class=fn>void <a href="#subtractLine"><b>subtractLine</b></a> ()</li>
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<li class=fn>int <a href="#minValue"><b>minValue</b></a> () const</li>
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<li class=fn>int <a href="#maxValue"><b>maxValue</b></a> () const</li>
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<li class=fn>void <a href="#setRange"><b>setRange</b></a> ( int minValue, int maxValue )</li>
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<li class=fn>void <a href="#setMinValue"><b>setMinValue</b></a> ( int minVal )</li>
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<li class=fn>void <a href="#setMaxValue"><b>setMaxValue</b></a> ( int maxVal )</li>
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<li class=fn>int <a href="#lineStep"><b>lineStep</b></a> () const</li>
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<li class=fn>int <a href="#pageStep"><b>pageStep</b></a> () const</li>
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<li class=fn>void <a href="#setSteps"><b>setSteps</b></a> ( int lineStep, int pageStep )</li>
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<li class=fn>int <a href="#bound"><b>bound</b></a> ( int v ) const</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>int <a href="#positionFromValue"><b>positionFromValue</b></a> ( int logical_val, int span ) const</li>
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<li class=fn>int <a href="#valueFromPosition"><b>valueFromPosition</b></a> ( int pos, int span ) const</li>
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<li class=fn>void <a href="#directSetValue"><b>directSetValue</b></a> ( int value )</li>
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<li class=fn>int <a href="#prevValue"><b>prevValue</b></a> () const</li>
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<li class=fn>virtual void <a href="#valueChange"><b>valueChange</b></a> ()</li>
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<li class=fn>virtual void <a href="#rangeChange"><b>rangeChange</b></a> ()</li>
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<li class=fn>virtual void <a href="#stepChange"><b>stepChange</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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The QRangeControl class provides an integer value within a range.
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<p>
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<p> Although originally designed for the <a href="qscrollbar.html">QScrollBar</a> widget, the
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QRangeControl can also be used in conjunction with other widgets
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such as <a href="qslider.html">QSlider</a> and <a href="qspinbox.html">QSpinBox</a>. Here are the five main concepts in
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the class:
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<p> <ol type=1>
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<p> <li> <em>Current value</em> The bounded integer that
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QRangeControl maintains. <a href="#value">value</a>() returns it, and several
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functions, including <a href="#setValue">setValue</a>(), set it.
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<p> <li> <em>Minimum</em> The lowest value that value() can ever
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return. Returned by <a href="#minValue">minValue</a>() and set by <a href="#setRange">setRange</a>() or one of the
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constructors.
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<p> <li> <em>Maximum</em> The highest value that value() can ever
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return. Returned by <a href="#maxValue">maxValue</a>() and set by setRange() or one of the
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constructors.
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<p> <li> <em>Line step</em> The smaller of two natural steps that
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QRangeControl provides and typically corresponds to the user
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pressing an arrow key. The line step is returned by <a href="#lineStep">lineStep</a>()
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and set using <a href="#setSteps">setSteps</a>(). The functions <a href="#addLine">addLine</a>() and
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<a href="#subtractLine">subtractLine</a>() respectively increment and decrement the current
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value by lineStep().
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<p> <li> <em>Page step</em> The larger of two natural steps that
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QRangeControl provides and typically corresponds to the user
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pressing PageUp or PageDown. The page step is returned by
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<a href="#pageStep">pageStep</a>() and set using setSteps(). The functions <a href="#addPage">addPage</a>() and
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substractPage() respectively increment and decrement the current
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value by pageStep().
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<p> </ol>
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<p> Unity (1) may be viewed as a third step size. <a href="#setValue">setValue</a>() lets you
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set the current value to any integer in the allowed range, not
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just <a href="#minValue">minValue</a>() + <em>n</em> * lineStep() for integer values of <em>n</em>.
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Some widgets may allow the user to set any value at all; others
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may just provide multiples of lineStep() or pageStep().
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<p> QRangeControl provides three virtual functions that are well
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suited for updating the on-screen representation of range controls
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and emitting signals: <a href="#valueChange">valueChange</a>(), <a href="#rangeChange">rangeChange</a>() and
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<a href="#stepChange">stepChange</a>().
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<p> QRangeControl also provides a function called <a href="#bound">bound</a>() which lets
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you force arbitrary integers to be within the allowed range of the
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range control.
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<p> We recommend that all widgets that inherit QRangeControl provide
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at least a signal called valueChanged(); many widgets will want to
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provide addStep(), <a href="#addPage">addPage</a>(), substractStep() and substractPage()
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as slots.
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<p> Note that you must use multiple inheritance if you plan to
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implement a widget using QRangeControl because QRangeControl is
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not derived from <a href="qwidget.html">QWidget</a>.
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<p>See also <a href="misc.html">Miscellaneous Classes</a>.
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="QRangeControl"></a>QRangeControl::QRangeControl ()
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</h3>
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Constructs a range control with a minimum value of 0, maximum
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value of 99, line step of 1, page step of 10 and initial value 0.
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<h3 class=fn><a name="QRangeControl-2"></a>QRangeControl::QRangeControl ( int minValue, int maxValue, int lineStep, int pageStep, int value )
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</h3>
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Constructs a range control whose value can never be smaller than
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<em>minValue</em> or greater than <em>maxValue</em>, whose line step size is
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<em>lineStep</em> and page step size is <em>pageStep</em> and whose value is
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initially <em>value</em> (which is guaranteed to be in range using
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<a href="#bound">bound</a>()).
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<h3 class=fn><a name="~QRangeControl"></a>QRangeControl::~QRangeControl ()<tt> [virtual]</tt>
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</h3>
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Destroys the range control
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<h3 class=fn>void <a name="addLine"></a>QRangeControl::addLine ()
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</h3>
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Equivalent to <tt>setValue( value() + lineStep() )</tt>.
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<p> If the value is changed, then <a href="#valueChange">valueChange</a>() is called.
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<p> <p>See also <a href="#subtractLine">subtractLine</a>(), <a href="#addPage">addPage</a>(), and <a href="#setValue">setValue</a>().
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<h3 class=fn>void <a name="addPage"></a>QRangeControl::addPage ()
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</h3>
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Equivalent to <tt>setValue( value() + pageStep() )</tt>.
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<p> If the value is changed, then <a href="#valueChange">valueChange</a>() is called.
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<p> <p>See also <a href="#subtractPage">subtractPage</a>(), <a href="#addLine">addLine</a>(), and <a href="#setValue">setValue</a>().
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<h3 class=fn>int <a name="bound"></a>QRangeControl::bound ( int v ) const
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</h3>
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Forces the value <em>v</em> to be within the range from <a href="#minValue">minValue</a>() to
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<a href="#maxValue">maxValue</a>() inclusive, and returns the result.
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<p> This function is provided so that you can easily force other
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numbers than <a href="#value">value</a>() into the allowed range. You do not need to
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call it in order to use QRangeControl itself.
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<p> <p>See also <a href="#setValue">setValue</a>(), <a href="#value">value</a>(), <a href="#minValue">minValue</a>(), and <a href="#maxValue">maxValue</a>().
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<h3 class=fn>void <a name="directSetValue"></a>QRangeControl::directSetValue ( int value )<tt> [protected]</tt>
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</h3>
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Sets the range control <em>value</em> directly without calling
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<a href="#valueChange">valueChange</a>().
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<p> Forces the new <em>value</em> to be within the legal range.
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<p> You will rarely have to call this function. However, if you want
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to change the range control's value inside the overloaded method
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valueChange(), <a href="#setValue">setValue</a>() would call the function valueChange()
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again. To avoid this recursion you must use <a href="#directSetValue">directSetValue</a>()
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instead.
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<p> <p>See also <a href="#setValue">setValue</a>().
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<h3 class=fn>int <a name="lineStep"></a>QRangeControl::lineStep () const
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</h3>
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<p> Returns the line step.
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<p> <p>See also <a href="#setSteps">setSteps</a>() and <a href="#pageStep">pageStep</a>().
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<h3 class=fn>int <a name="maxValue"></a>QRangeControl::maxValue () const
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</h3>
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<p> Returns the maximum value of the range.
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<p> <p>See also <a href="#setMaxValue">setMaxValue</a>(), <a href="#setRange">setRange</a>(), and <a href="#minValue">minValue</a>().
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<h3 class=fn>int <a name="minValue"></a>QRangeControl::minValue () const
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</h3>
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<p> Returns the minimum value of the range.
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<p> <p>See also <a href="#setMinValue">setMinValue</a>(), <a href="#setRange">setRange</a>(), and <a href="#maxValue">maxValue</a>().
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<h3 class=fn>int <a name="pageStep"></a>QRangeControl::pageStep () const
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</h3>
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<p> Returns the page step.
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<p> <p>See also <a href="#setSteps">setSteps</a>() and <a href="#lineStep">lineStep</a>().
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<h3 class=fn>int <a name="positionFromValue"></a>QRangeControl::positionFromValue ( int logical_val, int span ) const<tt> [protected]</tt>
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</h3>
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Converts <em>logical_val</em> to a pixel position. <a href="#minValue">minValue</a>() maps to 0,
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<a href="#maxValue">maxValue</a>() maps to <em>span</em> and other values are distributed evenly
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in-between.
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<p> This function can handle the entire integer range without
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overflow, providing <em>span</em> is <= 4096.
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<p> Calling this method is useful when actually drawing a range
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control such as a <a href="qscrollbar.html">QScrollBar</a> on-screen.
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<p> <p>See also <a href="#valueFromPosition">valueFromPosition</a>().
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<h3 class=fn>int <a name="prevValue"></a>QRangeControl::prevValue () const<tt> [protected]</tt>
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</h3>
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<p> Returns the previous value of the range control. "Previous value"
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means the value before the last change occurred. Setting a new
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range may affect the value, too, because the value is forced to be
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inside the specified range. When the range control is initially
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created, this is the same as <a href="#value">value</a>().
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<p> <a href="#prevValue">prevValue</a>() can be outside the current legal range if a call to
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<a href="#setRange">setRange</a>() causes the current value to change. For example, if the
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range was [0, 1000] and the current value is 500, setRange(0, 400)
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makes value() return 400 and prevValue() return 500.
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<p> <p>See also <a href="#value">value</a>() and <a href="#setRange">setRange</a>().
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<h3 class=fn>void <a name="rangeChange"></a>QRangeControl::rangeChange ()<tt> [virtual protected]</tt>
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</h3>
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This virtual function is called whenever the range control's range
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changes. You can reimplement it if you want to be notified when
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the range changes. The default implementation does nothing.
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<p> Note that this method is called after the range has changed.
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<p> <p>See also <a href="#setRange">setRange</a>(), <a href="#valueChange">valueChange</a>(), and <a href="#stepChange">stepChange</a>().
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<p>Reimplemented in <a href="qdial.html#rangeChange">QDial</a>, <a href="qslider.html#rangeChange">QSlider</a>, and <a href="qspinbox.html#rangeChange">QSpinBox</a>.
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<h3 class=fn>void <a name="setMaxValue"></a>QRangeControl::setMaxValue ( int maxVal )
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</h3>
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Sets the minimum value of the range to <em>maxVal</em>.
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<p> If necessary, the <a href="#minValue">minValue</a>() is adjusted so that the range remains
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valid.
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<p> <p>See also <a href="#maxValue">maxValue</a>() and <a href="#setMinValue">setMinValue</a>().
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<h3 class=fn>void <a name="setMinValue"></a>QRangeControl::setMinValue ( int minVal )
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</h3>
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Sets the minimum value of the range to <em>minVal</em>.
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<p> If necessary, the <a href="#maxValue">maxValue</a>() is adjusted so that the range remains
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valid.
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<p> <p>See also <a href="#minValue">minValue</a>() and <a href="#setMaxValue">setMaxValue</a>().
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<h3 class=fn>void <a name="setRange"></a>QRangeControl::setRange ( int minValue, int maxValue )
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</h3>
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Sets the range control's minimum value to <em>minValue</em> and its
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maximum value to <em>maxValue</em>.
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<p> Calls the virtual <a href="#rangeChange">rangeChange</a>() function if one or both of the new
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minimum and maximum values are different from the previous
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setting. Calls the virtual <a href="#valueChange">valueChange</a>() function if the current
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value is adjusted because it was outside the new range.
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<p> If <em>maxValue</em> is smaller than <em>minValue</em>, <em>minValue</em> becomes
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the only legal value.
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<p> <p>See also <a href="#minValue">minValue</a>() and <a href="#maxValue">maxValue</a>().
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<p>Examples: <a href="listbox-example.html#x1441">listbox/listbox.cpp</a>, <a href="tutorial1-12.html#x2387">t12/lcdrange.cpp</a>, <a href="tutorial1-05.html#x2315">t5/main.cpp</a>, <a href="tutorial1-06.html#x2325">t6/main.cpp</a>, <a href="tutorial1-08.html#x2334">t8/lcdrange.cpp</a>, and <a href="xform-example.html#x1250">xform/xform.cpp</a>.
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<h3 class=fn>void <a name="setSteps"></a>QRangeControl::setSteps ( int lineStep, int pageStep )
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</h3>
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Sets the range's line step to <em>lineStep</em> and page step to <em>pageStep</em>.
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<p> Calls the virtual <a href="#stepChange">stepChange</a>() function if the new line step
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or page step are different from the previous settings.
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<p> <p>See also <a href="#lineStep">lineStep</a>(), <a href="#pageStep">pageStep</a>(), and <a href="#setRange">setRange</a>().
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|
||
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<h3 class=fn>void <a name="setValue"></a>QRangeControl::setValue ( int value )
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</h3>
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||
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Sets the range control's value to <em>value</em> and forces it to be
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|
within the legal range.
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||
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<p> Calls the virtual <a href="#valueChange">valueChange</a>() function if the new value is
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||
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|
different from the previous value. The old value can still be
|
||
|
|
retrieved using <a href="#prevValue">prevValue</a>().
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||
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<p> <p>See also <a href="#value">value</a>().
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<h3 class=fn>void <a name="stepChange"></a>QRangeControl::stepChange ()<tt> [virtual protected]</tt>
|
||
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|
</h3>
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||
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|
This virtual function is called whenever the range control's
|
||
|
|
line or page step settings change. You can reimplement it if you
|
||
|
|
want to be notified when the step changes. The default
|
||
|
|
implementation does nothing.
|
||
|
|
<p> Note that this method is called after a step setting has changed.
|
||
|
|
<p> <p>See also <a href="#setSteps">setSteps</a>(), <a href="#rangeChange">rangeChange</a>(), and <a href="#valueChange">valueChange</a>().
|
||
|
|
|
||
|
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<h3 class=fn>void <a name="subtractLine"></a>QRangeControl::subtractLine ()
|
||
|
|
</h3>
|
||
|
|
Equivalent to <tt>setValue( value() - lineStep() )</tt>.
|
||
|
|
<p> If the value is changed, then <a href="#valueChange">valueChange</a>() is called.
|
||
|
|
<p> <p>See also <a href="#addLine">addLine</a>(), <a href="#subtractPage">subtractPage</a>(), and <a href="#setValue">setValue</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>void <a name="subtractPage"></a>QRangeControl::subtractPage ()
|
||
|
|
</h3>
|
||
|
|
Equivalent to <tt>setValue( value() - pageStep() )</tt>.
|
||
|
|
<p> If the value is changed, then <a href="#valueChange">valueChange</a>() is called.
|
||
|
|
<p> <p>See also <a href="#addPage">addPage</a>(), <a href="#subtractLine">subtractLine</a>(), and <a href="#setValue">setValue</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>int <a name="value"></a>QRangeControl::value () const
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
<p> Returns the current range control value. This is guaranteed to be
|
||
|
|
within the range [minValue(), <a href="#maxValue">maxValue</a>()].
|
||
|
|
<p> <p>See also <a href="#setValue">setValue</a>() and <a href="#prevValue">prevValue</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>void <a name="valueChange"></a>QRangeControl::valueChange ()<tt> [virtual protected]</tt>
|
||
|
|
</h3>
|
||
|
|
This virtual function is called whenever the range control value
|
||
|
|
changes. You can reimplement it if you want to be notified when
|
||
|
|
the value changes. The default implementation does nothing.
|
||
|
|
<p> Note that this method is called after the value has changed. The
|
||
|
|
previous value can be retrieved using <a href="#prevValue">prevValue</a>().
|
||
|
|
<p> <p>See also <a href="#setValue">setValue</a>(), <a href="#addPage">addPage</a>(), <a href="#subtractPage">subtractPage</a>(), <a href="#addLine">addLine</a>(), <a href="#subtractLine">subtractLine</a>(), <a href="#rangeChange">rangeChange</a>(), and <a href="#stepChange">stepChange</a>().
|
||
|
|
|
||
|
|
<p>Reimplemented in <a href="qdial.html#valueChange">QDial</a>, <a href="qslider.html#valueChange">QSlider</a>, and <a href="qspinbox.html#valueChange">QSpinBox</a>.
|
||
|
|
<h3 class=fn>int <a name="valueFromPosition"></a>QRangeControl::valueFromPosition ( int pos, int span ) const<tt> [protected]</tt>
|
||
|
|
</h3>
|
||
|
|
Converts the pixel position <em>pos</em> to a value. 0 maps to
|
||
|
|
<a href="#minValue">minValue</a>(), <em>span</em> maps to <a href="#maxValue">maxValue</a>() and other values are
|
||
|
|
distributed evenly in-between.
|
||
|
|
<p> This function can handle the entire integer range without
|
||
|
|
overflow.
|
||
|
|
<p> Calling this method is useful if you actually implemented a range
|
||
|
|
control widget such as <a href="qscrollbar.html">QScrollBar</a> and want to handle mouse press
|
||
|
|
events. This function then maps screen coordinates to the logical
|
||
|
|
values.
|
||
|
|
<p> <p>See also <a href="#positionFromValue">positionFromValue</a>().
|
||
|
|
|
||
|
|
<!-- eof -->
|
||
|
|
<hr><p>
|
||
|
|
This file is part of the <a href="index.html">Qt toolkit</a>.
|
||
|
|
Copyright © 1995-2007
|
||
|
|
<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
|
||
|
|
<table width=100% cellspacing=0 border=0><tr>
|
||
|
|
<td>Copyright © 2007
|
||
|
|
<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
|
||
|
|
<td align=right><div align=right>Qt 3.3.8</div>
|
||
|
|
</table></div></address></body>
|
||
|
|
</html>
|