#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_OBJECT

public:

    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();

}