QT day3

保存：

//保存
void Widget::on_savebtn_clicked()
{
    QString name = QFileDialog::getSaveFileName(this,"保存文件","E:/c/qt3",
                                            "Image File(*.png *.jpg *bmp);;Text File(*.txt);;ALL(*.*)");

    if(name.isNull())
    {
        QMessageBox::information(this,"提示","你取消了保存文件");
        return;
    }
    else
    {
        qDebug()<textEdit->toPlainText();
        //将文件写入
        qDebug()<

键盘按下响应

void Widget::keyPressEvent(QKeyEvent *event)//键盘按下
{
    //qDebug()<<"jianpan按下"<text()<<"键值为"<key();
    switch(event->key())
    {
        case 'W':
        {
            if(ui->label->y() <= 0-ui->label->height())
            {
              ui->label->move(ui->label->x(),this->height());
            }
            ui->label->move(ui->label->x(),ui->label->y()-10);
        }
        break;
    case 'S':
    {
        if(ui->label->y() >= this->height())
        {
             ui->label->move(ui->label->x(), 0-ui->label->height());
         }
         else
         {
            ui->label->move(ui->label->x(), ui->label->y() + 10);
         }
    }
    break;
    case 'A':
    {
        if(ui->label->x() <= 0-ui->label->width())
        {
          ui->label->move(this->width(),ui->label->y());
        }
        ui->label->move(ui->label->x()-10,ui->label->y());
    }
    break;
    case 'D':
    {
        if(ui->label->x() >= this->width())
        {
             ui->label->move(0-ui->label->width(), ui->label->y());
         }
         else
        ui->label->move(ui->label->x()+10,ui->label->y());
    }
    break;

    }

}