Qt基础学习（3）-----滑动条之QSlider

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//mydialog.h
#ifndef MYDIALOG_H
#define MYDIALOG_H
#include <QDialog>
class QLineEdit;
class QSlider;
class MyDialog : public QDialog
{
Q_OBJECT
public:
explicit MyDialog(QWidget *parent = 0);
signals:
public slots:
void setLineEditValue(int value);
private:
QLineEdit *lineEdit;
QSlider *slider;
};
#endif // MYDIALOG_H

//mydialog.cpp
#include "mydialog.h"
#include <QtGui/QLineEdit>
#include <QtGui/QSlider>
#include <QtGui/QHBoxLayout>
MyDialog::MyDialog(QWidget *parent) :
QDialog(parent)
{
lineEdit = new QLineEdit("50"); //新建一个水平方向的滑动条QSlider控件
slider = new QSlider(Qt::Horizontal);
//设置滑动条控件的最小值
slider->setMinimum(0);
//设置滑动条控件的最大值
slider->setMaximum(100);
//设置滑动条控件的值
slider->setValue(50); //信号和槽当滑动条的值发生改变时，即产生一个valueChanged(int)信号设置QLineEdit控件的显示文本
connect(slider, SIGNAL(valueChanged(int)), this, SLOT(setLineEditValue(int))); QHBoxLayout *layout = new QHBoxLayout();
layout->addWidget(lineEdit);
layout->addWidget(slider); this->setLayout(layout);
this->resize(200, 50);
this->setWindowTitle("QSliderDemo");
}void MyDialog::setLineEditValue(int value)
{
int pos = slider->value();
QString str = QString("%1").arg(pos);
lineEdit->setText(str);
}