day2: homework 第二到六题

homework-day2-2/homework-day2-2.pro

@@ -26,3 +26,6 @@ HEADERS += \
 qnx: target.path = /tmp/$${TARGET}/bin
 else: unix:!android: target.path = /opt/$${TARGET}/bin
 !isEmpty(target.path): INSTALLS += target
+
+RESOURCES += \
+    res.qrc

homework-day2-2/mainwindow.cpp

@@ -3,6 +3,92 @@
 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()

homework-day2-2/mainwindow.h

@@ -1,12 +1,32 @@
 #ifndef MAINWINDOW_H
 #define MAINWINDOW_H
 
+#include <QDebug>
 #include <QMainWindow>
+#include <QMenu>
+#include <QMenuBar>
+#include <QAction>
+#include <QTextEdit>
+#include <QStatusBar>
+#include <QFileDialog>
+#include <QFile>
+#include <QMessageBox>
+#include <QTextStream>
+#include <QLabel>
+#include <QPixmap>
 
 class MainWindow : public QMainWindow
 {
     Q_OBJECT
 
+private:
+    QMenuBar *menu_bar; // 菜单栏
+    QMenu *menu1,*menu2,*menu3,*menu4; // 文件、编辑、查看、关于
+    QStatusBar *status_bar; // 状态栏
+    QTextEdit *text_edit; // 文本编辑（中心空间）
+    QAction *openAction,*saveAction,*exitAction; // 打开、保存、退出
+    QAction *aboutAction,*aboutQtAction; // 关于、关于Qt
+
 public:
     MainWindow(QWidget *parent = nullptr);
     ~MainWindow();

homework-day2-2/res.qrc

@@ -1,2 +1,7 @@
-<!DOCTYPE RCC>
-<RCC version="1.0"/>
+<RCC>
+    <qresource prefix="/">
+        <file alias="logo">images/logo.png</file>
+        <file alias="open">images/open.png</file>
+        <file alias="save">images/save.png</file>
+    </qresource>
+</RCC>