qfedu-qt-level/homework-day2-2/mainwindow.cpp

#include "mainwindow.h"

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    setWindowTitle("简单记事");
    setFixedSize(800,600);
    QPixmap window_icon;
    window_icon.load(":logo");
    setWindowIcon(QIcon(window_icon));


    menu_bar = new QMenuBar(this); // 父组件为当前 MainWindow
    setMenuBar(menu_bar);



    menu1 = new QMenu("文件",menu_bar); // 父组件为 menu_bar
    openAction = new QAction("打开",menu1); // 父组件为 menu1
    saveAction = new QAction("保存",menu1);
    exitAction = new QAction("退出",menu1);
    openAction->setShortcut(QKeySequence(tr("ctrl+o"))); // 快捷键绑定
    saveAction->setShortcut(QKeySequence(Qt::CTRL+Qt::Key_S));
    exitAction->setShortcut(QKeySequence(tr("ctrl+q")));
    connect(openAction,&QAction::triggered,[&]{ // 事件绑定
        qDebug()<<"打开...";
        // 打开文件
        QString file_path = QFileDialog::getOpenFileName(this,"打开文件",".","Text(*.txt);;Markdown(*.md)");
        QFile file(file_path);
        if(!file.open(QIODevice::ReadOnly|QIODevice::Text)){
            QMessageBox::critical(this,"错误","文件路径 "+file_path+" 打开错误");
            return; // 提前返回
        }
        QTextStream in(&file);
        text_edit->setMarkdown(in.readAll());
        file.close();
    });
    connect(saveAction,&QAction::triggered,[&]{
        qDebug()<<"保存...";
        QString file_path = QFileDialog::getSaveFileName(this,"保存文件",".","Markdown(*.md)");
        QFile file(file_path);
        if(!file.open(QIODevice::WriteOnly|QIODevice::Text)){
            QMessageBox::critical(this,"错误","文件路径 "+file_path+"无法保存");
            return;
        }
        QTextStream out(&file);
        out << text_edit->toMarkdown();
        file.close();
    });
    connect(exitAction,&QAction::triggered,[&]{
        qDebug()<<"退出...";
        this->close();
    });
    openAction->setIcon(QIcon(":open"));
    saveAction->setIcon(QIcon(":save"));
    menu1->addAction(openAction);
    menu1->addAction(saveAction);
    menu1->addAction(exitAction);

    menu2 = new QMenu("编辑",menu_bar);
    menu3 = new QMenu("查看",menu_bar);
    menu4 = new QMenu("关于",menu_bar);
    aboutAction = new QAction("关于软件",menu4);
    aboutQtAction = new QAction("关于Qt",menu4);
    connect(aboutAction,&QAction::triggered,[&]{
        QMessageBox::about(this,"简单记事","这是一个简单的记事本");
    });
    connect(aboutQtAction,&QAction::triggered,[&]{
        QMessageBox::aboutQt(this);
    });
    menu4->addAction(aboutAction);
    menu4->addAction(aboutQtAction);

    menu_bar->addMenu(menu1);
    menu_bar->addMenu(menu2);
    menu_bar->addMenu(menu3);
    menu_bar->addMenu(menu4);



    status_bar = new QStatusBar(this);
    QLabel *left_status_label = new QLabel("行4 列19",status_bar);
    QLabel *right_status_label = new QLabel("utf-8",status_bar);

    status_bar->addWidget(left_status_label);
    status_bar->addPermanentWidget(right_status_label); // 添加永久小部件
    setStatusBar(status_bar);

    text_edit = new QTextEdit("文本区占位符",this);
    setCentralWidget(text_edit);

}

MainWindow::~MainWindow()
{
}