#ifndef MAINWINDOW_H
#define MAINWINDOW_H#include <QMainWindow>
#include <QApplication>
#include <QAction>
#include <QMenu>
#include <QFileDialog>
#include <QFile>
#include <QTextStream>
#include <QToolBar>
#include <QTextEdit>
#include <QMainWindow>
#include <QString>
#include <QMenuBar>class MainWindow : public QMainWindow
{Q_OBJECTpublic:explicit MainWindow(QWidget *parent = 0);~MainWindow();void createMenus();void createActions();void createToolBars();void loadFile(QString fileName);public slots:void slotNewFile();void slotOpenFile();void slotSaveFile();private:QMenu *fileMenu;QMenu *editMenu;QMenu *aboutMenu;QString fileName;QToolBar *fileTool;QToolBar *editTool;QAction *fileOpenAction;QAction *fileNewAction;QAction *fileSaveAction;QAction *exitAction;QAction *copyAction;QAction *cutAction;QAction *pasteAction;QAction *aboutAction;QTextEdit *text;};#endif // MAINWINDOW_H

#include "mainwindow.h"MainWindow::MainWindow(QWidget *parent) :QMainWindow(parent){//设置主窗口标题setWindowTitle(tr("QMainWindow"));text = new QTextEdit(this);setCentralWidget(text);createActions();createMenus();createToolBars();}MainWindow::~MainWindow()
{}void MainWindow::createActions()
{//通过图片路径来实现添加Qt资源文件目的fileOpenAction = new QAction(QIcon("C:/qt/Mwindow/open.png"),tr("Open"),this);fileOpenAction->setShortcut(tr("Ctrl+O"));fileOpenAction->setStatusTip(tr("Open a file"));connect(fileOpenAction,SIGNAL(triggered()),this,SLOT(slotOpenFile()));fileNewAction = new QAction(QIcon("C:/qt/Mwindow/new.png"),tr("New"),this);fileNewAction->setShortcut(tr("Ctrl+N"));fileNewAction->setStatusTip(tr("new file"));connect(fileNewAction,SIGNAL(triggered()),this,SLOT(slotNewFile()));fileSaveAction = new QAction(QIcon("C:/qt/Mwindow/save.png"),tr("Save"),this);fileSaveAction->setShortcut(tr("Ctrl+S"));fileNewAction->setStatusTip(tr("save file"));connect(fileNewAction,SIGNAL(triggered()),this,SLOT(slotSaveFile()));exitAction = new QAction(tr("Exit"),this);exitAction->setShortcut(tr("Ctrl+Q"));exitAction->setStatusTip(tr("exit"));connect(exitAction,SIGNAL(triggered()),this,SLOT(close()));cutAction = new QAction(QIcon("C:/qt/Mwindow/cut.png"),tr("Cut"),this);cutAction->setShortcut(tr("Ctrl+X"));cutAction->setStatusTip(tr("cut to clipboard"));connect(cutAction,SIGNAL(triggered()),text,SLOT(cut()));copyAction = new QAction(QIcon("C:/qt/Mwindow/copy.png"),tr("Copy"),this);copyAction->setShortcut(tr("Ctrl+C"));copyAction->setStatusTip(tr("copy to clipboard"));connect(copyAction,SIGNAL(triggered()),this,SLOT(copy()));pasteAction = new QAction(QIcon("C:/qt/Mwindow/paste.png"),tr("paste"),this);pasteAction->setShortcut(tr("Ctrl+V"));pasteAction->setStatusTip(tr("paste clipboard to selection"));connect(pasteAction,SIGNAL(triggered()),this,SLOT(paste()));aboutAction = new QAction(tr("About"),this);connect(aboutAction,SIGNAL(triggered()),this,SLOT(slotAbout()));}void MainWindow::createMenus()
{fileMenu = menuBar()->addMenu(tr("File"));fileMenu->addAction(fileNewAction);fileMenu->addAction(fileOpenAction);fileMenu->addAction(fileSaveAction);fileMenu->addAction(exitAction);editMenu = menuBar()->addMenu(tr("Edit"));editMenu->addAction(copyAction);editMenu->addAction(cutAction);editMenu->addAction(pasteAction);aboutMenu = menuBar()->addMenu(tr("Help"));aboutMenu->addAction(aboutAction);}void MainWindow::createToolBars()
{fileTool = addToolBar("File");fileTool->addAction(fileNewAction);fileTool->addAction(fileOpenAction);fileTool->addAction(fileSaveAction);editTool = addToolBar("Edit");editTool->addAction(copyAction);editTool->addAction(cutAction);editTool->addAction(pasteAction);
}void MainWindow::slotNewFile()
{MainWindow *newWin = new MainWindow;newWin->show();
}void MainWindow::slotOpenFile()
{fileName = QFileDialog::getOpenFileName(this);if(!fileName.isEmpty()){if(text->document()->isEmpty()){loadFile(fileName);}else{MainWindow *newWin = new MainWindow;newWin->show();newWin->loadFile(fileName);}}}void MainWindow::loadFile(QString fileName)
{printf("file name:%s\n",fileName.data());QFile file(fileName);if(file.open(QIODevice::ReadOnly|QIODevice::Text)){QTextStream textStream(&file);while(!textStream.atEnd()){text->append(textStream.readLine());printf("read line.\n");}printf("end\n");}
}

#include <QtGui/QApplication>
#include "mainwindow.h"int main(int argc, char *argv[])
{QApplication a(argc, argv);MainWindow w;w.show();return a.exec();
}