0210作业

思维导图

作业

练习

#include "widget.h"
#include "ui_widget.h"

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
    this->setMouseTracking(true);
}

Widget::~Widget()
{
    delete ui;
}


void Widget::mousePressEvent(QMouseEvent *event)
{
     //qDebug() << "有鼠标被按下";
    if(event->button()==Qt::LeftButton)
    {
        qDebug() << "鼠标左键被按下";
    }
    else if(event->button()==Qt::RightButton)
    {
        qDebug() << "鼠标右键被按下";
    }
    else if(event->button()==Qt::MidButton)
    {
        qDebug() << "鼠标中键被按下";
    }
}
void Widget::mouseReleaseEvent(QMouseEvent *event)
{
    if(event->button()==Qt::LeftButton)
    {
        qDebug() << "鼠标左键被抬起";
    }
    else if(event->button()==Qt::RightButton)
    {
        qDebug() << "鼠标右键被抬起";
    }
    else if(event->button()==Qt::MidButton)
    {
        qDebug() << "鼠标中键被抬起";
    }
}
void Widget::mouseDoubleClickEvent(QMouseEvent *event)
{
    if(event->button()==Qt::LeftButton)
    {
        qDebug() << "鼠标左键被双击";
    }
    else if(event->button()==Qt::RightButton)
    {
        qDebug() << "鼠标右键被双击";
    }
    else if(event->button()==Qt::MidButton)
    {
        qDebug() << "鼠标中键被双击";
    }
}
void Widget::mouseMoveEvent(QMouseEvent *event)
{
    if(event->buttons()==Qt::LeftButton)
    {
        qDebug() << "鼠标左键被移动" <<event->pos() <<event->globalPos();
    }
    else if(event->buttons()==Qt::RightButton)
    {
        qDebug() << "鼠标右键被移动"<<event->pos() <<event->globalPos();
    }
    else if(event->buttons()==Qt::MidButton)
    {
        qDebug() << "鼠标中键被移动"<<event->pos() <<event->globalPos();
    }
}

void Widget::keyPressEvent(QKeyEvent *event)
{
    qDebug() <<event->text()<<"被按下，对应的值为："<<event->key();
}

void Widget::keyReleaseEvent(QKeyEvent *event)
{
    qDebug() <<event->text()<<"被按下，对应的值为："<<event->key();
}

补充

void Widget::on_saveBtn_clicked()
{
    //调用静态成员函数
    QString fname = QFileDialog::getSaveFileName(this,
                                                 "选择文件",
                                                 "./",
                                                 "all(*.*);;text(*.txt);;Image(*,png *.jpg *.xpm);;soures(*.cpp)");
    QFile f;
    f.setFileName(fname);
    if(!f.exists())
    {
        QMessageBox::information(this,"提示","文件不存在");
        return;
    }
    if(!f.open(QFile::WriteOnly))
    {
        QMessageBox::information(this,"提示","文件打开失败");
    }

    //从QTextEdit读取文件
    QString q = ui->textEdit->toPlainText();

    //将内容写入文件
    QByteArray msg = q.toUtf8();
    f.write(msg);

    //关闭文件
    f.close();





}

题目