QT学习笔记（六）各种控件

void on_comboBox_currentIndexChanged(const QString &arg1);

private:

Ui::Widget *ui;

QTimer timer;

#include "ui_widget.h"

Widget::Widget(QWidget *parent) :

QWidget(parent),

ui(new Ui::Widget)

{

ui->setupUi(this);

ui->timeEdit->setTime(QTime::currentTime());

ui->dateEdit->setDate(QDate::currentDate());

ui->dateTimeEdit->setDateTime(QDateTime::currentDateTime());

ui->progressBar->setValue(100);

connect(&timer, &QTimer::timeout,

[this](){

static int i = 0;

i++;

ui->lcdNumber->display(i);

int v = ui->progressBar->value();

v -= 20;

ui->progressBar->setValue(v);

if (v == 0)

timer.stop();

});

timer.start(1000);

}

Widget::~Widget()

{

delete ui;

}

void Widget::on_comboBox_currentIndexChanged(const QString &arg1)

{

if (arg1 == "第一题")

ui->textEdit->setText("第一题");

else if (arg1 == "第二题")

ui->textEdit->setText("第二题");

else if (arg1 == "第三题")

ui->textEdit->setText("第三题");

}