qt5之QDail,QsSpinBox,QDoubleSpinBox

我会带着你远行 2022-03-11 07:49 67阅读 0赞

（一）圆形调节器QDail的学习  
1，mainwindow.h

#ifndef MAINWINDOW_H
    #define MAINWINDOW_H
    
    #include <QMainWindow>
    #include <QDial>
    
    class MainWindow : public QMainWindow
    {
        Q_OBJECT
    
    public:
        MainWindow(QWidget *parent = 0);
        ~MainWindow();
    
        QDial* dl[10];
    
    public slots:
        void changedDate();
    };
    
    #endif

2，mainwindow.cpp

#include "mainwindow.h"
    #include <QtDebug>
    
    MainWindow::MainWindow(QWidget *parent)
        : QMainWindow(parent)
    {
        this->resize(200,200);
        this->centralWidget();
    
        int xpos = 10 ;
        for(int i=0;i<3;i++)
        {
            dl[i] = new QDial(this); 
            dl[i]->setRange(0,200);
            dl[i]->setGeometry(xpos,10,100,100);
            xpos += 110;
        }
        // 显示刻度
        dl[0]->setNotchesVisible(true);
        connect(dl[0],SIGNAL(valueChanged(int)),this,SLOT(changedDate()));
    }
    
    MainWindow::~MainWindow()
    {
    
    }
    
    void MainWindow::changedDate()
    {
        qDebug()<<dl[0]->value();
    }

3,main.cpp

#include "mainwindow.h"
    #include <QApplication>
    
    int main(int argc, char *argv[])
    {
        QApplication a(argc, argv);
        MainWindow w;
        w.show();
    
        return a.exec();
    }

（二）水平调节器的使用  
1,mainwindow.h

#ifndef MAINWINDOW_H
    #define MAINWINDOW_H
    
    #include <QMainWindow>
    #include <QSpinBox>
    #include <QDoubleSpinBox>
    
    class MainWindow : public QMainWindow
    {
        Q_OBJECT
    
    public:
        MainWindow(QWidget *parent = 0);
        ~MainWindow();
    
        QSpinBox* spin[10];
        QDoubleSpinBox* doublespin[10];
    };

2，mainwindow.cpp

#include "mainwindow.h"
    
    MainWindow::MainWindow(QWidget *parent)
        : QMainWindow(parent)
    {
        this->resize(400,300);
        this->centralWidget();
    
        int xpos = 10 ;
        int ypos = 30 ;
    
        int val[] = {10,110,210};
        double double_val[] = {51.5,17.32,11.32};
    
        for(int i=0;i<3;i++)
        {
            spin[i] = new QSpinBox(this);
            spin[i]->setMinimum(10);
            spin[i]->setMaximum(200);
            spin[i]->setValue(val[i]);
            spin[i]->setGeometry(xpos,ypos,100,30);
            spin[i]->setPrefix("$ ");
    
            doublespin[i] = new QDoubleSpinBox(this);
            doublespin[i]->setMinimum(10.0);
            doublespin[i]->setMaximum(200.0);
            doublespin[i]->setValue(double_val[i]);
            doublespin[i]->setGeometry(xpos+110,ypos,100,30);
            doublespin[i]->setSuffix(" mm");
    
            ypos += 40 ;
        }
    }
    
    MainWindow::~MainWindow()
    {
    
    }

3,main.cpp