Qt大作业————记事本——Day3

今天做的是文件的新建 打开 保存 另存为

 

//新建

void MainWindow::on_actionNew_triggered()

{

    ui->TextEdit->clear();

    this->setWindowTitle(tr("新建文本文件"));

}

//打开

void MainWindow::on_actionOpen_triggered()

{

    QString filename = QFileDialog::getOpenFileName(this,"打开文件",".",

                                                    tr("Text files (*.txt);; ALL(*.*)"));

    QFile file(filename);

 

    //判断是否打开文件

    if(!file.open(QFile::ReadOnly | QFile::Text)){

        return;

    }

    filePath = filename;

    QTextStream in(&file);

    QString text = in.readAll();

    ui->TextEdit->insertPlainText(text);

    file.close();

    this->setWindowTitle(QFileInfo(filename).absoluteFilePath());

}

//保存

void MainWindow::on_actionSave_triggered()

{

    QFile file(filePath);

    //判断是否打开

    if(!file.open(QFile::WriteOnly | QFile::Text)){

        QString filename = QFileDialog::getSaveFileName(this,"保存文件",".",

                                                        tr("Text files (*.txt);; ALL(*.*)"));

        QFile file(filename);

        if(!file.open(QFile::WriteOnly | QFile::Text)){

            return;

        }

        filePath = filename;

    }

    QTextStream out(&file);

    QString text = ui->TextEdit->toPlainText();

    out<<text;

    file.flush();

    file.close();

    this->setWindowTitle(QFileInfo(filePath).absoluteFilePath());

}

//另存为

void MainWindow::on_actionSaveAs_triggered()

{

    QString filename = QFileDialog::getSaveFileName(this,"保存文件",".",

                                                    tr("Text files (*.txt);; ALL(*.*)"));

    QFile file(filename);

    //判断是否打开文件

    if(!file.open(QFile::WriteOnly | QFile::Text)){

        return;

    }

     filePath = filename;

     QTextStream out(&file);

     QString text = ui->TextEdit->toPlainText();

     out<<text;

     file.flush();

     file.close();

     this->setWindowTitle(QFileInfo(filePath).absoluteFilePath());

}