Qt：QSlider

比眉伴天荒 2023-01-12 11:47 168阅读 0赞

1、新建QtGUI应用，选取QWidget为基类，取消创建界面

2、widget.h中

#ifndef WIDGET_H
    #define WIDGET_H
    
    #include <QSlider>
    #include <QLabel>
    
    class Widget : public QWidget
    {
        Q_OBJECT
    
    public:
        Widget(QWidget *parent = 0);
        ~Widget();
    
    private:
        QSlider *slider[6];
        QLabel *lbl[3];
    
    private slots:
        void valueChanged1(int value);
        void valueChanged2(int value);
        void valueChanged3(int value);
    
    };
    
    #endif // WIDGET_H

widget.cpp中

#include "widget.h"
    
    Widget::Widget(QWidget *parent)
        : QWidget(parent)
    {
        int xpos = 20, ypos = 20;
        for(int i = 0 ; i < 6 ; i++)
        {
            if(i <= 2)
            {
                slider[i] = new QSlider(Qt::Vertical, this);
                slider[i]->setGeometry(xpos, 20, 30, 80);
                xpos += 30;
            }
            else if(i >= 3)
            {
                slider[i] = new QSlider(Qt::Horizontal, this);
                slider[i]->setGeometry(130, ypos, 80, 30);
                ypos += 30;
            }
    
            slider[i]->setRange(0, 100);
            slider[i]->setValue(50);
        }
    
        xpos = 20;
        for(int i = 0 ; i < 3 ; i++)
        {
            lbl[i] = new QLabel(QString("%1").arg(slider[i]->value()), this);
            lbl[i]->setGeometry(xpos+10, 100, 30, 40);
            xpos += 30;
        }
    
        connect(slider[0], SIGNAL(valueChanged(int)), this,
                           SLOT(valueChanged1(int)));
    
        connect(slider[1], SIGNAL(valueChanged(int)), this,
                           SLOT(valueChanged2(int)));
    
        connect(slider[2], SIGNAL(valueChanged(int)), this,
                           SLOT(valueChanged3(int)));
    }
    
    void Widget::valueChanged1(int value)
    {
        lbl[0]->setText(QString("%1").arg(value));
        slider[3]->setValue(slider[0]->value());
    }
    
    void Widget::valueChanged2(int value)
    {
        lbl[1]->setText(QString("%1").arg(value));
        slider[4]->setValue(slider[1]->value());
    }
    
    void Widget::valueChanged3(int value)
    {
        lbl[2]->setText(QString("%1").arg(value));
        slider[5]->setValue(slider[2]->value());
    }
    
    Widget::~Widget()
    {
    
    }

效果：

![96df8625da44da6702acbf7e063c2dbd.png][]

[96df8625da44da6702acbf7e063c2dbd.png]: /images/20221119/184f1b868199405a9e89ad083dc2fd97.png