#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QFont>
#include <QFontDialog>
#include <QMessageBox>
#include <QColor>
#include <QColorDialog>
#include <QFileDialog>
#include <QDebug>
#include <QFile>
namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = nullptr);
    ~MainWindow();

private slots:
    void on_colorbtn_clicked();

    void on_openbtn_clicked();

    void on_savebtn_clicked();

    void on_txtbtn_clicked();

private:
    Ui::MainWindow *ui;
    QString filename;
};

#endif // MAINWINDOW_H

?文章來(lái)源地址http://www.zghlxwxcb.cn/news/detail-560924.html

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
}

MainWindow::~MainWindow()
{
    delete ui;
}
void MainWindow::on_colorbtn_clicked()
{
    QColor c = QColorDialog::getColor(QColor(0,255,0),this,"選擇顏色");
    if(c.isValid()){
        ui->textEdit->setTextColor(c);
    }else {
        QMessageBox::information(this,"錯(cuò)誤","沒(méi)有選擇顏色");
}
}

void MainWindow::on_openbtn_clicked()
{
    filename=QFileDialog::getOpenFileName(this,"打開(kāi)文件","./","text file(*.txt)");
    qDebug()<<filename;
    QFile file(filename);
    if(!file.exists()) {
        QMessageBox::information(this,"錯(cuò)誤","文件不存在");
    }
    if(!file.open(QIODevice::ReadWrite)){
        QMessageBox::information(this,"錯(cuò)誤","文件打開(kāi)失敗");
        return;
    }
    QByteArray msg=file.readAll();
    file.close();
    ui->textEdit->setText(QString::fromUtf8(msg));
}

void MainWindow::on_savebtn_clicked()
{
    QString pathName = QFileDialog::getSaveFileName(this, "保存文件", "./", "TEXT(*.txt)");

        //實(shí)例化文件對(duì)象
        QFile file(pathName);

        //打開(kāi)文件
        file.open(QIODevice::WriteOnly | QIODevice::Truncate);

        //寫(xiě)入數(shù)據(jù)
        QString text = ui->textEdit->toPlainText();
        file.write(text.toLocal8Bit());

        //關(guān)閉文件
        file.close();
}

void MainWindow::on_txtbtn_clicked()
{
    bool ok;
    QFont f = QFontDialog::getFont(&ok,QFont("宋體",10,2,false),this,"選擇字體");
    if(ok){
        ui->textEdit->setCurrentFont(f);
    }
    else{
        QMessageBox::information(this,"錯(cuò)誤","沒(méi)有選擇字體");
    }
}

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