Qt记事本，美化版

主体代码实现

#include "mainwindow.h"

#include "ui_mainwindow.h"

#include<QMenu>

#include<QMenuBar>

#include<QToolBar>

#include<QDockWidget>

#include<QTextEdit>

#include<QDialog>

#include<QAction>

#include<QMessageBox>

#include<QWindow>

#include <QFile>

#include <QFileDialog>

#include <QTextStream>

#include <QIcon>

#include<QString>

#include<QFont>

#include<QDebug>

#include<QFontDialog>

#include<QColorDialog>

#include<QPalette>

#include<QColor>

#include<QMessageBox>

#include<QImage>

#include<QTextDocumentFragment>

#include<QPicture>

#include<QFile>

MainWindow::MainWindow(QWidget *parent)

    : QMainWindow(parent)

    , ui(new Ui::MainWindow)

{

    ui->setupUi(this);

//背景

    edit->setParent(this);

    setCentralWidget(edit);

    QPalette pl = edit->palette();

    setWindowTitle("记事本鬼灭之刃版");

    this->resize(1000,800);

   setStyleSheet("border-image:url(:/a3.jpg)");

//菜单

    QMenuBar *bar=menuBar();

    setMenuBar(bar);

    bar->addSeparator();

    QMenu *m8=bar->addMenu("文件");

    QMenu *m1=bar->addMenu("工具");

    QMenu *m2=bar->addMenu("字号");

    QMenu *m3=bar->addMenu("颜色");

    QMenu *m9=bar->addMenu("字体");

    QMenu *m4=bar->addMenu("撤回");

    QMenu *m5=bar->addMenu("恢复");

    QMenu *m7=bar->addMenu("帮助");

//文件

    //新建

    QAction *file=new QAction(tr("新建"));

    file->setShortcut(tr("Ctrl+N"));

    m8->addAction(file);

    m8->addSeparator();

    connect(file,&QAction::triggered,this,&MainWindow::newfile);

    //打开

    QAction *open=new QAction(tr("打开"));

    open->setShortcut(tr("Ctrl+X"));

    m8->addAction(open);

    m8->addSeparator();

    connect(open,&QAction::triggered,this,&MainWindow::open);

    //关闭

    QAction *close=new QAction(tr("关闭"));

    close->setShortcut(tr("Ctrl+L"));

    m8->addAction(close);

    m8->addSeparator();

    connect(close,&QAction::triggered,this,&MainWindow::closefun);

//工具

    //复制

    QAction *copy=new QAction(tr("复制"));

    copy->setShortcut(tr("Ctrl+C"));

    m1->addAction(copy);

    m1->addSeparator();

    connect(copy,&QAction::triggered,this,&MainWindow::copyfun);

    //粘贴

    QAction *copywrite=new QAction(tr("粘贴"));

    copywrite->setShortcut(tr("Ctrl+V"));

    m1->addAction(copywrite);

    m1->addSeparator();

    connect(copywrite,&QAction::triggered,this,&MainWindow::copywritefun);

    //另存为

    QAction *down=new QAction(tr("另存为"));

    down->setShortcut(tr("Ctrl+A"));

    m1->addAction(down);

    m1->addSeparator();

    connect(down,&QAction::triggered,this,&MainWindow::downfun);

//字号

    //手写

    QAction *a1=new QAction("一号");

    m2->addAction(a1);

    m2->addSeparator();

    connect(a1,&QAction::triggered,[=](){

         edit->setStyleSheet("font-size : 12px");

    });

    QAction *a2=new QAction("二号",m2);

    m2->addAction(a2);

    m2->addSeparator();

    connect(a2,&QAction::triggered,[=](){

         edit->setStyleSheet("font-size : 14px");

    });

    QAction *a3=new QAction("三号",m2);

    m2->addAction(a3);

    m2->addSeparator();

    connect(a3,&QAction::triggered,[=](){

         edit->setStyleSheet("font-size : 16px");

    });

    QAction *a4=new QAction("四号",m2);

    m2->addAction(a4);

    m2->addSeparator();

    connect(a4,&QAction::triggered,[=](){

         edit->setStyleSheet("font-size : 18px");

    });

    QAction *a5=new QAction("五号",m2);

    m2->addAction(a5);

    m2->addSeparator();

    connect(a5,&QAction::triggered,[=](){

         edit->setStyleSheet("font-size : 20px");

    });

    QAction *a6=new QAction("六号",m2);

    m2->addAction(a6);

    m2->addSeparator();

    connect(a6,&QAction::triggered,[=](){

        edit->setStyleSheet("font-size : 22px");

    });

    QAction *a7=new QAction("七号",m2);

    m2->addAction(a7);

    m2->addSeparator();

    connect(a7,&QAction::triggered,[=](){

        edit->setStyleSheet("font-size : 24px");

    });

    QAction *a8=new QAction("八号",m2);

    m2->addAction(a8);

    m2->addSeparator();

    connect(a8,&QAction::triggered,[=](){

         edit->setStyleSheet("font-size : 26px");

    });

    //对话框

    QAction *a9=new QAction("更多选择");

    m2->addAction(a9);

    m2->addSeparator();

    connect(a9,&QAction::triggered,[=](){

        bool ok;

          QFont font = QFontDialog::getFont(&ok,this);

          if(ok)

              edit->setFont(font);

          else

              qDebug()<<tr("没有选择字体");

       } );

//颜色

    //手写— 红

    QAction *red=new QAction("红色");

    m3->addAction(red);

    m3->addSeparator();

    connect(red,&QAction::triggered,[=](){

        edit->setTextColor(QColor(255,0,0));

    });

    //手写- 绿

    QAction *green=new QAction("绿色");

    m3->addAction(green);

    m3->addSeparator();

    connect(green,&QAction::triggered,[=](){

        edit->setTextColor(QColor(0,255,0));

    });

    //手写- 蓝

    QAction *blue=new QAction("蓝色",m3);

    m3->addAction(blue);

    m3->addSeparator();

    connect(blue,&QAction::triggered,[=](){

        edit->setTextColor(QColor(0,0,255));

    });

    //对话框

    QAction *cmore=new  QAction("更多颜色");

    m3->addAction(cmore);

    connect(cmore,&QAction::triggered,[=](){

       QColor color = QColorDialog::getColor();

       if(color.isValid()){

           edit->setTextColor(color);

       }

    });

//字体

    //手写加粗斜体

    QAction *w1=new QAction("加粗");

    QAction *w2=new QAction("斜体");

    m9->addAction(w1);

    m9->addSeparator();

    m9->addAction(w2);

    m9->addSeparator();

    connect(w1,&QAction::triggered,[=]{

        edit->setStyleSheet("font-weight: bold;");

    });

    connect(w2,&QAction::triggered,[=]{

        edit->setFontItalic(true);

    });

    //更换字体

//撤回

    QAction *x1=new QAction("撤回");

    m4->addAction(x1);

    m4->addSeparator();

    x1->setShortcut(tr("Ctrl+Z"));

    connect(x1,&QAction::triggered,[=](){

         edit->undo();

    });

//恢复

    QAction *x2=new QAction("恢复");

    m5->addAction(x2);

    m5->addSeparator();

    x2->setShortcut(tr("Ctrl+M"));

    connect(x2,&QAction::triggered,[=](){

         edit->redo();

    });

//帮助

    QAction *hlep=new QAction("帮助");

    m7->addAction(hlep);

    hlep->setShortcut(tr("Ctrl+H"));

    connect(hlep,&QAction::triggered,[=](){

      QDialog dialog;

      dialog.setWindowTitle(tr("懒得写帮助，自己用用看吧"));

      dialog.exec();

    });

}

MainWindow::~MainWindow()

{

    delete ui;

}

void MainWindow::newfile(){

    edit->clear();

    edit->setText(QString());

}

void MainWindow::closefun(){

    QMessageBox box;

    box.setText("确定要关闭吗？");//用模态对话框来实现。

    box.setStandardButtons(QMessageBox::Yes|QMessageBox::No);

    if(box.exec()==QMessageBox::No){

        return;

    }

    else{

        this->close();

    }

}

void MainWindow::copyfun(){

    edit->copy();

}

void MainWindow::copywritefun(){

    edit->paste();

}

void MainWindow::downfun(){

    QString fn = QFileDialog::getSaveFileName(this,"另存为");

    QFile file(fn);

    file.open(QIODevice::Text|QIODevice::WriteOnly);//打开方式只写，并且是Text

    QTextStream in(&file);

    QString filecontent = edit->toPlainText();//toPlainText读取

    in << filecontent;

    file.close();

}

void MainWindow::open(){

    QString FileName=QFileDialog::getOpenFileName(this,"Open File",QDir::currentPath());

        QFile *file=new QFile;

        file->setFileName(FileName);

        bool ok=file->open(QIODevice::ReadOnly);    //判断是否只读模式打开

        if(ok){

            QTextStream in(file);   //类比c++的io流，使之与file绑定

            edit->setText(in.readAll());   //这个用法学c++的时候我还没看过

            file->close();//关闭文件和c++一样

            delete file;

        }

        else return;//打不开

}

头文件代码

Mainwindow.h

#ifndef MAINWINDOW_H

#define MAINWINDOW_H

#include <QMainWindow>

#include<QTextEdit>

#include <QMouseEvent>

#include<QDockWidget>

#include <QPaintEvent>

QT_BEGIN_NAMESPACE

namespace Ui { class MainWindow; }

QT_END_NAMESPACE

class MainWindow : public QMainWindow

{

    Q_OBJECT

public:

    MainWindow(QWidget *parent = nullptr);

    ~MainWindow();

private:

    Ui::MainWindow *ui;

    QString now;

    QTextEdit *edit=new QTextEdit;

public slots:

    void open();

    void copyfun();

    void copywritefun();

    void downfun();

    void newfile();

    void closefun();

};

#endif // MAINWINDOW_H

巴特西

Qt记事本，美化版

主体代码实现

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