qt第三天

#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::keyPressEvent(QKeyEvent *event)
{
    qDebug()<<"键盘被按下了";
    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()>=0+this->height())
        {
            ui->label->move(ui->label->x(),0-ui->label->height());
        }
        ui->label->move(ui->label->x(),ui->label->y()+10);
    }
    break;
    case 'D':
    {
        if(ui->label->x()>=0+this->width())
        {
            ui->label->move(0-ui->label->width(),ui->label->y());
        }
        ui->label->move(ui->label->x()+10,ui->label->y());
    }
    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;
    }
}

void Widget::keyReleaseEvent(QKeyEvent *event)
{
    qDebug()<<"键盘弹起了";
}

#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_pushButton_clicked()
{
    bool ok;
    QFont f=QFontDialog::getFont(&ok,
                         QFont("隶书",10,10,false),this,"选择字体");
    if(ok)
    {
        ui->textEdit->setFont(f);
    }
    else
    {
        QMessageBox::information(this,"提示","您取消了选择字体");
    }
}

void Widget::on_btn2_clicked()
{
    QColor c = QColorDialog::getColor(QColor("pink"),this,"选择颜色");
    if(c.isValid())
    {
       // ui->textEdit->setTextColor(c);
        ui->textEdit->setTextBackgroundColor(c);
    }
    else
    {
        QMessageBox::information(this,"提示","您取消了选择颜色");
    }
}

void Widget::on_btn3_clicked()
{
    QString fileName = QFileDialog::getOpenFileName(this,"选择文件","./",
                                                    "Image File(*.png *.jpg *bmp);;Text File(*.txt);;All(*.*)");
    if(fileName.isNull())
    {
        QMessageBox::information(this,"提示","您取消了选择打开");
        return;
    }
    qDebug()<textEdit->setText(QString::fromLocal8Bit(msg));
    //5、关闭文件
    file.close();

}

void Widget::on_pushButton_4_clicked()
{
    QString filename = QFileDialog::getSaveFileName(
                    this,                //父组件
                    "保存",         //标题
                    "./",                //起始路径
                    "Txt(*.txt)");      //过滤器

        //创建文件对象
        QFile file(filename);
        if(file.open(QFile::ReadWrite))
        {
            QString msg = ui->textEdit->toPlainText();
            file.write(msg.toLocal8Bit());      //写入文件中
        }
        else
        {
            QMessageBox::information(this,"提示","文件另存失败");
        }
}