# :-: 添加状态栏
在`mainwindows.h`里修改
```css
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <QTextEdit> //文本
#include <QMenu> //加入菜单
#include <QMenuBar> //加入菜单栏
#include <QAction> //加入菜单栏
#include <QFileDialog>
QT_BEGIN_NAMESPACE
class QTextEdit;
QT_END_NAMESPACE
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
MainWindow(QWidget *parent = 0);
private:
bool is_changed;
QTextEdit *editor; //中央XextEdit控件
QString fileName; //当前文件的名字
//文件菜单
QMenu *file_menu; //文件菜单
QAction *new_file; //新建文件菜单项
QAction *open_file; //打开文件菜单项
QAction *save_file; //保存文件菜单项
QAction *exit_file; //退出文件菜单项
//编辑菜单
QMenu *edit_menu; //编辑菜单
QAction *copy_edit; //编辑菜单的复制按钮
QAction *paste_edit;
QAction *cut_edit;
QAction *allselect_edit;
QMenu *help_menu; //帮助菜单
//编译菜单
QMenu *comp_menu; //编译菜单
QAction *comp_comp; //编译按钮
QAction *run_comp; //运行按钮
void precomp();
private slots:
void on_exit();//在QT编辑环境，安装ALT+ENTER，出现提示再按一次回车
void on_open(const QString &path = QString());
void on_save();
void on_new();
void on_copy();
void on_paste();
void on_cut();
void on_allselect();
void on_changed();
void on_comp();
void on_run();
void setupEditor();
void setupFileMenu();
void setupHelpMenu();
void about();
};
#endif // MAINWINDOW_H
```
在`mainwindows.cpp`里修改
```css
#include <QtWidgets>
#include "mainwindow.h"
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
{
setupFileMenu();
setupHelpMenu();
setupEditor();
setCentralWidget(editor);
setWindowTitle(tr("IDE"));
//文本内容在保存前是否发生变动
is_changed = false;
//添加菜单项，并为其设定快捷键
//【文件菜单栏】
file_menu = this->menuBar()->addMenu("文件");
new_file = new QAction("新建文件",this); //第一个参数是菜单项的文字，第二个参数是指向主体的指针
new_file ->setShortcut(tr("ctrl+n")); //设定快捷键
file_menu ->addAction(new_file); //关联 菜单栏 与 菜单项
file_menu ->addSeparator(); //在文件下拉菜单上面显示一个分隔符
open_file = new QAction("打开文件",this);
file_menu ->addAction(open_file);
open_file ->setShortcut(tr("ctrl+o"));
save_file = new QAction("保存文件",this);
file_menu ->addAction(save_file);
save_file ->setShortcut(tr("ctrl+s"));
exit_file = new QAction("退出",this);
file_menu ->addAction(exit_file);
//【编译菜单栏】
comp_menu = this->menuBar()->addMenu("编译");
comp_comp = new QAction("编译",this); comp_menu->addAction(comp_comp);
run_comp = new QAction("运行",this); comp_menu->addAction(run_comp);
//【帮助菜单栏】
help_menu = this->menuBar()->addMenu("帮助");
//【鼠标事件与函数关联】当鼠标点击exit_file 菜单的时候，执行on_exit()函数
connect(exit_file,SIGNAL(triggered()),this,SLOT(on_exit()));
connect(open_file,SIGNAL(triggered()),this,SLOT(on_open()));
connect(save_file,SIGNAL(triggered()),this,SLOT(on_save()));
connect(new_file,SIGNAL(triggered()),this,SLOT(on_new()));
connect(copy_edit,SIGNAL(triggered()),this,SLOT(on_copy()));
connect(paste_edit,SIGNAL(triggered()),this,SLOT(on_paste()));
connect(cut_edit,SIGNAL(triggered()),this,SLOT(on_cut()));
connect(allselect_edit,SIGNAL(triggered()),this,SLOT(on_allselect()));
connect(editor,SIGNAL(textChanged()),this,SLOT(on_changed()));//当文本内容发生变化时，触发on_changed函数
connect(comp_comp,SIGNAL(triggered()),this,SLOT(on_comp()));//当文本内容发生变化时，触发on_changed函数
connect(run_comp,SIGNAL(triggered()),this,SLOT(on_run()));//当文本内容发生变化时，触发on_changed函数
}
void MainWindow::on_open(const QString &path)
{
QString fileName = path;
if (fileName.isNull())
fileName = QFileDialog::getOpenFileName(this, tr("Open File"), "", "C++ Files (*.cpp *.h)");
if (!fileName.isEmpty()) {
QFile file(fileName);
if (file.open(QFile::ReadOnly | QFile::Text))
editor->setPlainText(file.readAll());
}
}
void MainWindow::setupFileMenu()
{
QMenu *fileMenu = new QMenu(tr("&File"),this);
menuBar()->addMenu(fileMenu);
//【编辑菜单栏】
edit_menu = this->menuBar()->addMenu("编辑");
copy_edit = new QAction("复制",this);
copy_edit ->setShortcut(tr("ctrl+c"));
edit_menu ->addAction(copy_edit);
paste_edit = new QAction("粘贴",this);
paste_edit ->setShortcut(tr("ctrl+v"));
edit_menu ->addAction(paste_edit);
cut_edit = new QAction("剪切",this);
cut_edit ->setShortcut(tr("ctrl+x"));
edit_menu ->addAction(cut_edit);
allselect_edit = new QAction("全选",this);
allselect_edit ->setShortcut(tr("ctrl+a"));
edit_menu ->addAction(allselect_edit);
}
void MainWindow::setupEditor()
{
QFont font;
font.setFamily("Courier");
font.setFixedPitch(true);
font.setPointSize(10);
editor = new QTextEdit;
editor->setFont(font);
QFile file("mainwindow.h");
if (file.open(QFile::ReadOnly | QFile::Text))
editor->setPlainText(file.readAll());
}
void MainWindow::about()
{
QMessageBox::about(this, tr("About IDE"),
tr("version0.0.1"));
}
void MainWindow::setupHelpMenu()
{
QMenu *helpMenu = new QMenu(tr("&Help"), this);
menuBar()->addMenu(helpMenu);
helpMenu->addAction(tr("&About"), this, SLOT(about()));
}
void MainWindow::precomp()//预编译
{
FILE *p = fopen(fileName.toStdString().data(),"r");
if(p == NULL) return ;
QString cmd = fileName +".c";
FILE *p1 = fopen(cmd.toStdString().data(),"w");
if(p1 == NULL) return ;
QString str;
while(!feof(p))
{
char buf[1024] = {0};
fgets(buf,sizeof(buf),p);
str += buf;
}
str.replace("包含","#include");
str.replace("主函数","main");
str.replace("整数","int");
str.replace("开始","{");
str.replace("收工","}");
str.replace("。",";");
str.replace("返回","return");
str.replace("打印","printf");
str.replace("输入输出","<stdio.h>");
str.replace("无声的等待...","getchar()");
fputs(str.toStdString().data(),p1);
fclose(p);
fclose(p1);
}
//程序退出
void MainWindow::on_exit()
{
this ->close();
}
//保存文件
void MainWindow::on_save()
{
if(fileName.isEmpty())
{
fileName = QFileDialog::getSaveFileName(this,"保存文件");
}
if(!fileName.isEmpty())
{
FILE *p = fopen(fileName.toStdString().data(),"w");
if(p == NULL) return ;
QString str = editor->toPlainText();
fputs(str.toStdString().data(),p);
fclose(p);
}
}
//新建文件
void MainWindow::on_new()
{
if(is_changed == true)
{
on_save();
is_changed = false;
}
fileName = "";
editor->setText("");
}
//IDE的复制功能
void MainWindow::on_copy()
{
editor->copy();
}
void MainWindow::on_paste()
{
editor->paste();
}
void MainWindow::on_cut()
{
editor->cut();
}
void MainWindow::on_allselect()
{
editor->selectAll();
}
void MainWindow::on_changed()
{
is_changed = true;
}
//编译并运行按钮
void MainWindow::on_comp()
{
if (is_changed == true)//在点击编译按钮，如果文本内容发生变化，就自动保存
{
on_save();
}
precomp();//自动以预编译
QString cmd;
const char *s = fileName.toStdString().data();
cmd.sprintf("gcc -o %s.exe %s.c",s,s);
system(cmd.toStdString().data());//先编译
//如何删除那个临时文件呢
cmd = fileName.replace("/","\\") + ".c";
remove(cmd.toStdString().data());
cmd = fileName + ".exe";
system(cmd.toStdString().data());//再运行
}
void MainWindow::on_run()
{
QString cmd;
cmd = fileName + ".exe";
system(cmd.toStdString().data());
}
```
