QT编程的问题?(十万火急）__include_slider_LCDRange_int_parent_

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QT编程的问题?(十万火急）

来源: 互联网发布时间：2015-03-24

本文导语: 代码如下，／／lcdrange.cpp文件如下 #include "lcdrange.h" #include #include LCDRange::LCDRange( QWidget *parent, const char *name ) : QVBox( parent, name ) { QLCDNumber *lcd = new QLCDNumber( 2, this, "lcd" ); sli...

代码如下，
／／lcdrange.cpp文件如下
#include "lcdrange.h"

#include
#include

LCDRange::LCDRange( QWidget *parent, const char *name )
        : QVBox( parent, name )
{
    QLCDNumber *lcd  = new QLCDNumber( 2, this, "lcd"  );
    slider = new QSlider( Horizontal, this, "slider" );
    slider->setRange( 0, 99 );
    slider->setValue( 0 );
    connect( slider, SIGNAL(valueChanged(int)),
             lcd, SLOT(display(int)) );
    connect( slider, SIGNAL(valueChanged(int)),
             SIGNAL(valueChanged(int)) );
}

int LCDRange::value() const
{
    return slider->value();
}

void LCDRange::setValue( int value )
{
    slider->setValue( value );
}
//lcdrange.h文件如下
#ifndef LCDRANGE_H
#define LCDRANGE_H
#include
#include
class QSlider;
class LCDRange : public QVBox
    {
        Q_OBJECT
    public:
        LCDRange( QWidget *parent=0, const char *name=0 );


    int value() const;
    public slots:
        void setValue( int );

    signals:
        void valueChanged( int );
   private:
QSlider *slider;
    };
#endif
//main.cpp文件如下

#include
#include
#include
#include
#include
#include

#include "lcdrange.h"

class MyWidget : public QVBox
{
public:
    MyWidget( QWidget *parent=0, const char *name=0 );
};

MyWidget::MyWidget( QWidget *parent, const char *name )
        : QVBox( parent, name )
{
    QPushButton *quit = new QPushButton( "Quit", this, "quit" );
    quit->setFont( QFont( "Times", 18, QFont::Bold ) );

    connect( quit, SIGNAL(clicked()), qApp, SLOT(quit()) );

    QGrid *grid = new QGrid( 4, this );

    LCDRange *previous = 0;
    for( int r = 0 ; r