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#ifndef WIDGET_H
#define WIDGET_H#include <QWidget>QT_BEGIN_NAMESPACE
namespace Ui {
class Widget;
}
QT_END_NAMESPACEclass Widget : public QWidget
{Q_OBJECTpublic:Widget(QWidget *parent = nullptr);~Widget();private slots:void on_pushButtonCal_clicked();void on_spinBoxDec_valueChanged(int arg1);void on_spinBoxBin_valueChanged(int arg1);void on_spinBoxHex_valueChanged(int arg1);private:Ui::Widget *ui;
};
#endif // WIDGET_H

#include "widget.h"
#include "ui_widget.h"Widget::Widget(QWidget *parent): QWidget(parent), ui(new Ui::Widget)
{ui->setupUi(this);connect(ui->spinBoxNum, &QSpinBox::valueChanged, this, &Widget::on_pushButtonCal_clicked);connect(ui->doubleSpinBoxPrice, &QDoubleSpinBox::valueChanged, this, &Widget::on_pushButtonCal_clicked);ui->doubleSpinBoxTotalPri->setDecimals(1);
}Widget::~Widget()
{delete ui;
}void Widget::on_pushButtonCal_clicked()
{int num = ui->spinBoxNum->value();float price = ui->doubleSpinBoxPrice->value();float total = num * price;ui->doubleSpinBoxTotalPri->setValue(total);
}void Widget::on_spinBoxDec_valueChanged(int arg1)
{ui->spinBoxBin->setValue(arg1);ui->spinBoxHex->setValue(arg1);
}void Widget::on_spinBoxBin_valueChanged(int arg1)
{ui->spinBoxDec->setValue(arg1);ui->spinBoxHex->setValue(arg1);
}void Widget::on_spinBoxHex_valueChanged(int arg1)
{ui->spinBoxBin->setValue(arg1);ui->spinBoxHex->setValue(arg1);
}

#ifndef WIDGET_H
#define WIDGET_H#include <QWidget>QT_BEGIN_NAMESPACE
namespace Ui {
class Widget;
}
QT_END_NAMESPACEclass Widget : public QWidget
{Q_OBJECTpublic:Widget(QWidget *parent = nullptr);~Widget();private slots:void on_btnLeft_clicked();void on_btnCenter_clicked();void on_btnRight_clicked();void on_btnBlod_clicked(bool checked);void on_btnItalic_clicked(bool checked);void on_btnUnderline_clicked(bool checked);void on_chkBoxReadOly_clicked(bool checked);void on_chkBoxEnable_clicked(bool checked);void on_chkBoxClear_clicked(bool checked);void on_radioBtnBlack_clicked();void on_redioBrnRed_clicked();void on_radioBtnBlue_clicked();private:Ui::Widget *ui;
};
#endif // WIDGET_H

#include "widget.h"
#include "ui_widget.h"Widget::Widget(QWidget *parent): QWidget(parent), ui(new Ui::Widget)
{ui->setupUi(this);
}Widget::~Widget()
{delete ui;
}void Widget::on_btnLeft_clicked()
{ui->lineEdit->setAlignment(Qt::AlignLeft);
}void Widget::on_btnCenter_clicked()
{ui->lineEdit->setAlignment(Qt::AlignCenter);
}void Widget::on_btnRight_clicked()
{ui->lineEdit->setAlignment(Qt::AlignRight);
}void Widget::on_btnBlod_clicked(bool checked)
{QFont font = ui->lineEdit->font();font.setBold(checked);ui->lineEdit->setFont(font);
}void Widget::on_btnItalic_clicked(bool checked)
{QFont font = ui->lineEdit->font();font.setItalic(checked);ui->lineEdit->setFont(font);
}void Widget::on_btnUnderline_clicked(bool checked)
{QFont font = ui->lineEdit->font();font.setUnderline(checked);ui->lineEdit->setFont(font);
}void Widget::on_chkBoxReadOly_clicked(bool checked)
{ui->lineEdit->setReadOnly(checked);
}void Widget::on_chkBoxEnable_clicked(bool checked)
{ui->lineEdit->setEnabled(checked);
}void Widget::on_chkBoxClear_clicked(bool checked)
{ui->lineEdit->setClearButtonEnabled(checked);
}void Widget::on_radioBtnBlack_clicked()
{QPalette palette = ui->lineEdit->palette();palette.setColor(QPalette::Text, Qt::black);ui->lineEdit->setPalette(palette);
}void Widget::on_redioBrnRed_clicked()
{QPalette palette = ui->lineEdit->palette();palette.setColor(QPalette::Text, Qt::red);ui->lineEdit->setPalette(palette);
}void Widget::on_radioBtnBlue_clicked()
{QPalette palette = ui->lineEdit->palette();palette.setColor(QPalette::Text, Qt::blue);ui->lineEdit->setPalette(palette);
}

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