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操作系统二组
Qt-maxiaowan
Commits
821ffdb2
Commit
821ffdb2
authored
Feb 01, 2021
by
浩
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821ffdb2
# clicked
dialog.h
#ifndef DIALOG_H
#define DIALOG_H
#include <QDialog>
#include <QLabel>
#include <QLineEdit>
#include <QPushButton>
class Dialog : public QDialog
{
Q_OBJECT
public:
Dialog(QWidget *parent = nullptr);
~Dialog();
private:
QLabel *label1,*label2;
QLineEdit *lineEdit;
QPushButton *button;
private slots:
void showArea();
};
#endif // DIALOG_H
dialog.cpp
#include "dialog.h"
#include <QGridLayout>
const static double PI=3.1416;
Dialog::Dialog(QWidget *parent)
: QDialog(parent)
{
label1=new QLabel(this);
label1->setText(tr("请输入圆的半径:"));
lineEdit=new QLineEdit(this);
label2=new QLabel(this);
button=new QPushButton(this);
button->setText(tr("显示对应圆的面积"));
QGridLayout *mainLayout=new QGridLayout(this);
mainLayout->addWidget(label1,0,0);
mainLayout->addWidget(lineEdit,0,1);
mainLayout->addWidget(label2,1,0);
mainLayout->addWidget(button,1,1);
connect(button,SIGNAL(clicked()),this,SLOT(showArea()));
}
Dialog::~Dialog()
{
}
void Dialog::showArea()
{
bool ok;
QString tempStr;
QString valueStr=lineEdit->text();
int valueInt=valueStr.toInt(&ok);
double area=valueInt *valueInt *PI;
label2->setText(tempStr.setNum(area));
}
# textChanged(QString)
dialog.h
#ifndef DIALOG_H
#define DIALOG_H
#include <QDialog>
#include <QLabel>
#include <QLineEdit>
#include <QPushButton>
class Dialog : public QDialog
{
Q_OBJECT
public:
Dialog(QWidget *parent = nullptr);
~Dialog();
private:
QLabel *label1,*label2;
QLineEdit *lineEdit;
QPushButton *button;
private slots:
void showArea();
};
#endif // DIALOG_H
dialog.cpp
#include "dialog.h"
#include <QGridLayout>
const static double PI=3.1416;
Dialog::Dialog(QWidget *parent)
: QDialog(parent)
{
label1=new QLabel(this);
label1->setText(tr("请输入圆的半径:"));
lineEdit=new QLineEdit(this);
label2=new QLabel(this);
button=new QPushButton(this);
button->setText(tr("显示对应圆的面积"));
QGridLayout *mainLayout=new QGridLayout(this);
mainLayout->addWidget(label1,0,0);
mainLayout->addWidget(lineEdit,0,1);
mainLayout->addWidget(label2,1,0);
mainLayout->addWidget(button,1,1);
connect(lineEdit,SIGNAL(textChanged(QString)),this,SLOT(showArea()));
}
Dialog::~Dialog()
{
}
void Dialog::showArea()
{
bool ok;
QString tempStr;
QString valueStr=lineEdit->text();
int valueInt=valueStr.toInt(&ok);
double area=valueInt *valueInt *PI;
label2->setText(tempStr.setNum(area));
}
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