QT 实现在一个模块中间显示一个红色提示框，3秒后消失

#include "dialog.h"

#include "ui_dialog.h"

#include <QLabel>

#include <QTimer>

Dialog::Dialog(QWidget *parent) :

QDialog(parent),

ui(new Ui::Dialog),

label(new QLabel(this))

{

ui->setupUi(this);

}

Dialog::~Dialog()

{

delete ui;

}

void Dialog::on_toolButton_clicked()

{

showFinished();

QTimer::singleShot(3000, this, SLOT(slotHideFinishedLabel()));  // 这里是一个3秒定时器， 且只执行一次。

}

//下面这是提示框隐藏

void Dialog::slotHideFinishedLabel()

{

label->hide();

this->close();

}

//下面这个红色提示框显示

void Dialog::showFinished()

{

QRect rect = geometry();

label->setMaximumWidth(500);

label->setMaximumHeight(50);

label->setMinimumWidth(500);

label->setMinimumHeight(50);

QFont font;

font.setPointSize(25);

label->setFont(font);

label->setStyleSheet(QLatin1String("color:red;"));

label->setText("The answer end of time!");

label->setGeometry(int((rect.width()-label->width())/2), int((rect.height()-label->height())/2), label->width(), label->height());

label->show();

}