Qt文本编辑器：从基础到功能实现

#include "mainwindow.h"

#include <QAction>
#include <QApplication>
#include <QClipboard>
#include <QCloseEvent>
#include <QFile>
#include <QFileInfo>
#include <QFileDialog>
#include <QIcon>
#include <QMimeData>
#include <QMenu>
#include <QMenuBar>
#include <QMessageBox>
#include <QTextCodec>
#include <QTextDocumentWriter>
#include <QTextEdit>
#include <QTextStream>
#include <QToolBar>



MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{

    setWindowTitle(tr("Main Window"));
    resize(500, 500);

    setupFileActions();

    setupEditActions();

    textEdit = new QTextEdit(this);
    setCentralWidget(textEdit);         //设置中心编辑框架
    textEdit->setFocus();               //设置文本焦点
    setCurrentFileName(QString());      //设置当前文件名

}

MainWindow::~MainWindow()
{

}
void MainWindow::setupFileActions()           //建立文件动作
{

    fileNewAction = new QAction(QIcon(":/images/New"), tr("&New"), this);       //传入图标，文本和指针
    fileNewAction->setPriority(QAction::LowPriority);                           //设置"新建"低优先权
    fileNewAction->setShortcuts(QKeySequence::New);                             //设置"新建"快捷键
    connect(fileNewAction, SIGNAL(triggered()), this, SLOT(fileNew()));         //信号槽新建

    fileOpenAction = new QAction(QIcon(":/images/Open"), tr("&Open"), this);    //传入图标，文本和指针
    fileOpenAction->setShortcuts(QKeySequence::Open);                           //设置"打开"快捷键
    connect(fileOpenAction, SIGNAL(triggered()), this, SLOT(fileOpen()));   //信号槽打开

    fileSaveAction = new QAction(QIcon(":/images/Save"), tr("&Save"), this);    //传入图标，文本和指针
    fileSaveAction->setShortcuts(QKeySequence::Save);                           //设置"保存"快捷键
    connect(fileSaveAction, SIGNAL(triggered()), this, SLOT(fileSave()));    //信号槽保存

    fileSaveAsAction = new QAction(tr("&SaveAs"), this);                         //传入图标，文本和指针