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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Qt Tutorial - t14/lcdrange.cpp</title></head><body bgcolor="#ffffff"><p><table width="100%"><tr><td><a href="index.html"><img width="100" height="100" src="qtlogo.png"alt="Home" border="0"><img width="100"height="100" src="face.png" alt="Home" border="0"></a><td valign="top"><div align="right"><img src="dochead.png" width="472" height="27"><br><a href="classes.html"><b>Classes</b></a>- <a href="annotated.html">Annotated</a>- <a href="hierarchy.html">Tree</a>- <a href="functions.html">Functions</a>- <a href="index.html">Home</a>- <a href="topicals.html"><b>Structure</b> <font face="Arial,Helvetica,Geneva,Swiss,SunSans-Regular" align="center" size=32>Qte</font></a></div></table><p><h1 align=center>Source code for <a href="t14.html">tutorial 14</a>: lcdrange.cpp</h1><br clear="all"><hr> <pre>/******************************************************************** Implementation of LCDRange class, Qt tutorial 12******************************************************************/#include "lcdrange.h"#include <<a href="qslider-h.html">qslider.h</a>>#include <<a href="qlcdnumber-h.html">qlcdnumber.h</a>>#include <<a href="qlabel-h.html">qlabel.h</a>>#include <<a href="qlayout-h.html">qlayout.h</a>>LCDRange::LCDRange( <a href="qwidget.html">QWidget</a> *parent, const char *name ) : <a href="qwidget.html">QWidget</a>( parent, name ){ <a href=#636>init</a>();}LCDRange::LCDRange( const char *s, QWidget *parent, const char *name ) : <a href="qwidget.html">QWidget</a>( parent, name ){ <a href=#636>init</a>(); <a href=#641>setText</a>( s );}void <a name="636"></a>LCDRange::init(){ <a href="qlcdnumber.html">QLCDNumber</a> *lcd = new <a href="qlcdnumber.html">QLCDNumber</a>( 2, this, "lcd" ); slider = new <a href="qslider.html">QSlider</a>( Horizontal, this, "slider" ); slider->setRange( 0, 99 ); slider->setValue( 0 ); label = new <a href="qlabel.html">QLabel</a>( " ", this, "label" ); label->setAlignment( AlignCenter ); <a href="qobject.html#fbde73">connect</a>( slider, SIGNAL(valueChanged(int)), lcd, SLOT(display(int)) ); <a href="qobject.html#fbde73">connect</a>( slider, SIGNAL(valueChanged(int)), SIGNAL(valueChanged(int)) ); <a href="qwidget.html#cddadb">setFocusProxy</a>( slider ); <a href="qvboxlayout.html">QVBoxLayout</a> * l = new <a href="qvboxlayout.html">QVBoxLayout</a>( this ); l-><a href="qboxlayout.html#ebba99">addWidget</a>( lcd, 1 ); l-><a href="qboxlayout.html#ebba99">addWidget</a>( slider ); l-><a href="qboxlayout.html#ebba99">addWidget</a>( label );}int <a name="637"></a>LCDRange::value() const{ return slider->value();}const char *<a name="638"></a>LCDRange::text() const{ return label->text();}void <a name="639"></a>LCDRange::setValue( int value ){ slider->setValue( value );}void <a name="640"></a>LCDRange::setRange( int minVal, int maxVal ){ if ( minVal < 0 || maxVal > 99 || minVal > maxVal ) { <a href="qapplication.html#290ef4">qWarning</a>( "<a name="640"></a>LCDRange::setRange(%d,%d)\n" "\tRange must be 0..99\n" "\tand minVal must not be greater than maxVal", minVal, maxVal ); return; } slider->setRange( minVal, maxVal );}void <a name="641"></a>LCDRange::setText( const char *s ){ label->setText( s );}</pre><p><p><address><hr><div align="center"><table width="100%" cellspacing="0" border="0"><tr><td>Copyright ⌨️ 快捷键说明
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