界面文件、事件、槽使用

原创已于 2024-07-17 09:39:51 修改 · 217 阅读

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#c++ #qt

于 2024-06-05 11:34:28 首次发布

dialog.h

#ifndef DIALOG_H
#define DIALOG_H

#include <QDialog>

namespace Ui {
class Dialog;
}

class Dialog : public QDialog
{
    Q_OBJECT

public:
    explicit Dialog(QWidget *parent = nullptr);
    ~Dialog();

private slots:
    void on_pushButton_clicked();

    void on_lineEdit_textChanged(const QString &arg1);

private:
    Ui::Dialog *ui;
};

#endif // DIALOG_H

dialog.cpp

#include "dialog.h"
#include "ui_dialog.h"

const static double PI = 3.1416;
Dialog::Dialog(QWidget *parent)
    : QDialog(parent)
    , ui(new Ui::Dialog)
{
    ui->setupUi(this);
}


Dialog::~Dialog()
{
    delete ui;
}

void Dialog::on_pushButton_clicked()
{
    bool ok;
    QString tempStr;
    QString valueStr = ui->lineEdit->text();
    int valueInt = valueStr.toInt(&ok);
    double area = valueInt* valueInt * PI;
    ui->areaLabel_2->setText(tempStr.setNum(area));

}


void Dialog::on_lineEdit_textChanged(const QString &arg1)
{
    bool ok;
    QString tempStr;
    QString valueStr = ui->lineEdit->text();
    int valueInt = valueStr.toInt(&ok);
    double area = valueInt* valueInt * PI;
    ui->areaLabel_2->setText(tempStr.setNum(area));
}