滑动条之QSlider

//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);   }  

//main.cpp   #include <QtGui/QApplication>   #include "mydialog.h"   int main(int argc, char *argv[])   {     QApplication a(argc, argv);     MyDialog dialog;     dialog.show();     return a.exec();   }  

文章来源: 滑动条之QSlider