QT 第三天（作业）

#include "mainwindow.h"

#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent)

    : QMainWindow(parent)

    , ui(new Ui::MainWindow)

{

    ui->setupUi(this);

    this->setFixedSize(800,520);

    ui->textEdit->resize(800,450);

    ui->textEdit->move(0,0);

    ui->fontBtn->resize(100,30);

    ui->fontBtn->move(205,460);

    ui->colorBtn->resize(100,30);

    ui->colorBtn->move(310,460);

    ui->openBtn->resize(100,30);

    ui->openBtn->move(415,460);

    ui->saveBtn->resize(100,30);

    ui->saveBtn->move(520,460);

}

MainWindow::~MainWindow()

{

    delete ui;

}

void MainWindow::on_fontBtn_clicked()

{

    bool ok;

        QFont f=QFontDialog::getFont(

                    &ok,

                    QFont("Times",14),

                    this);

        if(ok)

        {

            ui->textEdit->setCurrentFont(f);

        }

        else

        {

            QMessageBox::information(this,"wrong","that you selected is wrong");

        }

}

void MainWindow::on_colorBtn_clicked()

{

    QColor c=QColorDialog::getColor(

                QColor(125,32,58),

                this,

                "select color:");

    if(c.isValid())

    {

        ui->textEdit->setTextColor(c);

    }

};

void MainWindow::on_openBtn_clicked()

{

    QString filename=QFileDialog::getOpenFileName(

                this,

                "select the file",

                "./",

                "all (*.*);; 文本 (*.txt);; 头(*.h)");

    QFile file(filename);

    if(!file.exists())

    {

        QMessageBox::information(

                    this,

                    "wrong",

                    "the file is not exists",

                    QMessageBox::Ok);

    }

    if(!file.open(QIODevice::ReadWrite))

        {

            QMessageBox::information(this,"wrong","file open fail");

            return ;

        }

    QByteArray msg = file.readAll();

    file.close();

    ui->textEdit->setText(QString::fromLocal8Bit(msg));

}

void MainWindow::on_saveBtn_clicked()

{

    QString filename=QFileDialog::getOpenFileName(

                this,

                "save file",

                "./",

                "ALL (*.*) ;; 文本 (*.txt);; 头(*.h);;");

    QFile file(filename);

    if(!file.exists()){

        QMessageBox::information(

                    this,

                    "wrong",

                    "open file fail",

                    QMessageBox::Ok);}

    QString msg=ui->textEdit->toPlainText()+"\n";

    file.write(msg.toLocal8Bit());

    file.close();

    QMessageBox::information(this,"success","save file success",QMessageBox::Ok);

};