QT Learning Tour - Custom Controls

We choose widget

Above is the selected QT Fromstemplate

we can chooseQT设计师界面类

Adjust the length in the horizontalLayout component in QT

where 0,0is the constant width

Use custom controls in other components

About ComboBoxcontrols

ui->comboBox->addItem(QString("字符串"));

About QStringList

QStringList longerList = (QStringList() << str1 << str2 << str3);

ico add failed

Add this paragraph to xhcj.rc:

IDI_ICON ICON DISCARDABLE "ico的名称.ico"

Get the windows port number

pro file (add)

QT       += core gui serialport

cpp file (add)

#include<QtSerialPort/QSerialPort>
#include<QtSerialPort/QSerialPortInfo>
#include <QDebug>//这个可不添加

QList<QSerialPortInfo> serial_list = QSerialPortInfo::availablePorts();
QStringList com_list;
int serialsize = serial_list.size();
qDebug() << serial_list.size();//打印长度
for(int i = 0;i<serialsize;i++)
{
    
    
  QString flag = serial_list.at(i).description();
  //description()的功能：类型转换，将QSerialPortInfo类型转换成QString类型，description()的功能
  qDebug()<<i<<flag;
  if(flag == "USB 串行设备"){
    
    
    qDebug() << serial_list.at(i).portName();//输出端口号
    com_list = QStringList()<< serial_list.at(i).portName();
  }
}

About the form

Need to install QWT, please refer to the detailed installation steps ; QWT download address

Set the background cloth (ui interface)

QLinearGradient gradient(0,0,0,400);
gradient.setColorAt(1,QColor(90,90,90));
gradient.setColorAt(0.38,QColor(105,105,105));
gradient.setColorAt(1,QColor(70,70,70));
ui->qwtPlot->setCanvasBackground(QBrush(gradient));

set grid

QwtPlotGrid *grid = new QwtPlotGrid;
grid->enableXMin( true );
grid->setMajorPen( Qt::gray, 0, Qt::DotLine );
grid->setMinorPen( Qt::darkGray, 0, Qt::DotLine );
grid->attach( ui->qwtPlot );

.h file

#ifndef FFTLEARN_H
#define FFTLEARN_H

#include <QWidget>
#include "qwt_plot.h"
#include "qwt_plot_grid.h"
//#include <qwt_legend.h>
//#include <qwt_legend_label.h>
//#include <qwt_plot_legenditem.h>
#include <qwt_plot_curve.h>
#include <qwt_plot_textlabel.h>
#include <qwt_plot_zoomer.h>
//#include <qwt_scale_draw.h>
//#include <qwt_plot_renderer.h>
//#include <QMessageBox>


namespace Ui {
    
    
class fftLearn;
}

class fftLearn : public QWidget
{
    
    
    Q_OBJECT

public:
    explicit fftLearn(QWidget *parent = 0);
    virtual ~fftLearn();

private:
    int CurNum;
    QVector<QwtPlotCurve *> m_curve;
    QwtPlotZoomer *m_zoomer[2];
    QwtPlotTextLabel *InfoLabel;

private:
    Ui::fftLearn *ui;
    void InsertLegnd();
    void SetZoom();
private slots:
//    void showItem(const QVariant &itemInfo,bool on);
};

#endif // FFTLEARN_H