C++ GUI Qt4编写的文本编辑器

mainwindow.h:

#ifndef MAINWINDOW_H

#define MAINWINDOW_H

#include <QMenu>

#include <QAction>

#include <QFont>

#include <QToolBar>

#include <QLabel>

#include <QComboBox>

#include <QLineEdit>

#include <QTextEdit>

#include <QPrinter>

#include <QVBoxLayout>

#include <QGridLayout>

#include <QActionGroup>

#include <QPrintDialog>

#include <QPushButton>

#include <QToolButton>

#include <QTextStream>

#include <QMessageBox>

#include <QTextCodec>

#include <QMainWindow>

#include <QFileDialog>

#include <QFontDialog>

#include <QInputDialog>

#include <QFontDatabase>

#include <QFontComboBox>

#include <QColorDialog>

namespace Ui {

class MainWindow;

}

class MainWindow : public QMainWindow

{

    Q_OBJECT

public:

    explicit MainWindow(QWidget *parent = );

    void createAction();

    void createMenu();

    void createToolBar();

    void fileRead();//读文件

    void fileWrite();//写文件

    ~MainWindow();

public:

    Ui::MainWindow *ui;

    QMenu *file;

    QMenu *edit;

    QMenu *style;

    QMenu *insert;//插入菜单

    QMenu *search;//查找菜单

    QMenu *help;//帮助菜单

    QToolBar *fileToolBar;

    QToolBar *editToolBar;

    QToolBar *styleToolBar;

    QToolBar *insertToolBar;

    QToolBar *searchToolBar;

    QToolBar *helpToolBar;

    QTextEdit *textEdit;

    QAction *newFile;

    QAction *openFile;

    QAction *save;

    QAction *saveAs;

    QAction *printText;

    QAction *exit;

    QAction *undoAction;//撤销

    QAction *redoAction;//恢复

    QAction *copy;

    QAction *cut;

    QAction *paste;

    QAction *insertImg;

    QAction *insertTable;

    QAction *find;

    QAction *about;

    QAction *aboutQt;

    QAction *bold;

    QAction *italic;

    QAction *underLine;

    QAction *color;

    QAction *left;

    QAction *center;

    QAction *right;

    QAction *justify;

    QActionGroup *group;

    QLabel *fontLabel;

    QLabel *fontSizeLabel;

    QFontComboBox *fontCom;

    QComboBox *fontSizeCom;

    QString fileName;

    QLineEdit *lineEdit;

    QLabel *label;

    QPushButton *btn;

    QVBoxLayout *layout;

    QLineEdit *column;

    QLineEdit *row;

private slots:

    void findNext();

    void NewFile();

    void OpenFile();

    void Save();

    void SaveAs();

    void Color();

    void Bold();

    void Italic();

    void UnderLine();

    void ALignment(QAction *);

    void PrintText();

    void InsertImage();

    void InsertTable();

    void mergeFormat(QTextCharFormat);

    void FontComBox(QString fontComStr);

    void FontSizeCom(QString fontSizeStr);

    void Find();

    void About();

    void AboutQt();

    void showCurrentCharFormatChanged(const QTextCharFormat &form);

};

mainwindow.cpp:

#endif // MAINWINDOW_H

mainwindow.cpp:

#include "mainwindow.h"

#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :

    QMainWindow(parent),

    ui(new Ui::MainWindow)

{

    ui->setupUi(this);

    QTextCodec::setCodecForTr(QTextCodec::codecForLocale());

    setWindowIcon(QIcon(":/images/textEditor.png"));

    setWindowTitle(tr("Qt文本编辑器"));

    textEdit = new QTextEdit();

    setCentralWidget(textEdit);

    createAction();//创建动作

    createMenu();//创建菜单

    createToolBar();//创建工具栏

    //文件菜单的动作与槽的连接

    connect(newFile,SIGNAL(triggered()),this,SLOT(NewFile()));

    connect(openFile,SIGNAL(triggered()),this,SLOT(OpenFile()));

    connect(save,SIGNAL(triggered()),this,SLOT(Save()));

    connect(saveAs,SIGNAL(triggered()),this,SLOT(SaveAs()));

    connect(exit,SIGNAL(triggered()),this,SLOT(close()));

    //编辑菜单的动作与槽的连接

    connect(cut,SIGNAL(triggered()),textEdit,SLOT(cut()));

    connect(copy,SIGNAL(triggered()),textEdit,SLOT(copy()));

    connect(paste,SIGNAL(triggered()),textEdit,SLOT(paste()));

    connect(undoAction,SIGNAL(triggered()),textEdit,SLOT(undo()));

    connect(redoAction,SIGNAL(triggered()),textEdit,SLOT(redo()));

    //字体设置动作与槽的连接

    connect(fontCom,SIGNAL(activated(QString)),this,

            SLOT(FontComBox(QString)));

    //字号设置动作与槽的连接

    connect(fontSizeCom,SIGNAL(activated(QString)),this,SLOT(FontSizeCom(QString)));

    connect(textEdit,SIGNAL(currentCharFormatChanged(QTextCharFormat&)),

            this,SLOT(showCurrentCharFormatChanged(QTextCharFormat&)));

    //颜色编辑动作与槽的连接

    connect(color,SIGNAL(triggered()),this,SLOT(Color()));

    //格式菜单动作与槽的连接

    connect(bold,SIGNAL(triggered()),this,SLOT(Bold()));

    connect(italic,SIGNAL(triggered()),this,SLOT(Italic()));

    connect(underLine,SIGNAL(triggered()),this,SLOT(UnderLine()));

    connect(group,SIGNAL(triggered(QAction*)),this,SLOT(ALignment(QAction *)));

    //插入菜单动作与槽的连接

    connect(insertImg,SIGNAL(triggered()),this,SLOT(InsertImage()));

    connect(insertTable,SIGNAL(triggered()),this,SLOT(InsertTable()));

    //打印动作与槽的连接

    connect(printText,SIGNAL(triggered()),this,SLOT(PrintText()));

     //查找菜单动作与槽的连接

    connect(find,SIGNAL(triggered()),this,SLOT(Find()));

    connect(about,SIGNAL(triggered()),this,SLOT(About()));

    connect(aboutQt,SIGNAL(triggered()),this,SLOT(AboutQt()));

    resize(,);

}

//创建动作

void MainWindow::createAction(){

    QTextCodec::setCodecForTr(QTextCodec::codecForLocale());

    //新建文件

    newFile = new QAction(QIcon(":/images/new.png"),tr("新建文件"),this);

    newFile->setShortcut(tr("Ctrl+N"));

    newFile->setStatusTip(tr("新建一个文件"));

    //打开文件

    openFile = new QAction(QIcon(":/images/open.png"),tr("打开文件"),this);

    openFile->setShortcut(tr("Ctrl+O"));

    openFile->setStatusTip(tr("打开一个文件"));

    //保存文件

    save = new QAction(QIcon(":/images/save.png"),tr("保存"),this);

    save->setShortcut(tr("Ctrl+S"));

    save->setStatusTip(tr("保存文件"));

    //另存为

    saveAs = new QAction(QIcon(":/images/saveAs.png"),tr("另存为"),this);

    saveAs->setShortcut(tr("Ctrl+A"));

    saveAs->setStatusTip(tr("文件另存为"));

    //打印

    printText = new QAction(QIcon(":/images/printText.png"),tr("打印"),this);

    printText->setShortcut(tr("Ctrl+P"));

    printText->setStatusTip(tr("打印"));

   //退出

    exit = new QAction(QIcon(":/images/exit.png"),tr("退出"),this);

    exit->setShortcut(tr("Ctrl+E"));

    exit->setStatusTip(tr("退出"));

    //恢复

    redoAction = new QAction(QIcon(":/images/redo.png"),tr("恢复"),this);

    redoAction->setShortcut(tr("Ctrl+R"));

    redoAction->setStatusTip(tr("恢复"));

    //撤销

    undoAction = new QAction(QIcon(":/images/undo.png"),tr("撤销"),this);

    undoAction->setShortcut(tr("Ctrl+U"));

    undoAction->setStatusTip(tr("撤销"));

    //剪切

    cut = new QAction(QIcon(":/images/cut.png"),tr("剪切"),this);

    cut->setShortcut(tr("Ctrl+X"));

    cut->setStatusTip(tr("剪切"));

    //复制

    copy = new QAction(QIcon(":/images/copy.png"),tr("复制"),this);

    copy->setShortcut(tr("Ctrl+C"));

    copy->setStatusTip(tr("复制"));

   //粘贴

    paste = new QAction(QIcon(":/images/paste.png"),tr("黏贴"),this);

    paste->setShortcut(tr("Ctrl+P"));

    paste->setStatusTip(tr("粘贴"));

     //粗体

    bold = new QAction(QIcon(":/images/bold.png"),tr("粗体"),this);

    bold->setStatusTip(tr("粗体字"));

    bold->setCheckable(true);

    //斜体

    italic = new QAction(QIcon(":/images/italic.png"),tr("斜体"),this);

    italic->setStatusTip(tr("斜体字"));

    italic->setCheckable(true);

    //下划线

    underLine = new QAction(QIcon(":/images/underline.png"),tr("下划线"),this);

    underLine->setStatusTip(tr("下划线"));

    underLine->setCheckable(true);

    //颜色

    color = new QAction(QIcon(":/images/color.png"),tr("颜色"),this);

    color->setShortcut(tr("Ctrl+C"));

    color->setStatusTip(tr("颜色编辑"));

    group = new QActionGroup(this);

    //左对齐

    left = new QAction(QIcon(":/images/left.png"),tr("左对齐"),group);

    left->setStatusTip(tr("左对齐"));

    left->setCheckable(true);

    //居中

    center = new QAction(QIcon(":/images/center.png"),tr("居中对齐"),group);

    center->setStatusTip(tr("居中对齐"));

    center->setCheckable(true);

    //右对齐

    right = new QAction(QIcon(":/images/right.png"),tr("右对齐"),group);

    right->setStatusTip(tr("右对齐"));

    right->setCheckable(true);

    //两端对齐

    justify = new QAction(QIcon(":/images/justify.png"),tr("两端对齐"),group);

    justify->setStatusTip(tr("两端对齐"));

    justify->setCheckable(true);

    group->addAction(left);

    group->addAction(center);

    group->addAction(right);

    group->addAction(justify);

    //插入图片

    insertImg = new QAction(QIcon(":/images/image.png"),tr("插入图片"),this);

    insertImg->setStatusTip(tr("插入图片"));

    //插入表格

    insertTable = new QAction(QIcon(":/images/table.png"),tr("插入表格"),this);

    insertTable->setStatusTip(tr("插入表格"));

    //查找

    find = new QAction(QIcon(":/images/find.png"),tr("查找"),this);

    find->setShortcut(tr("Ctrl+F"));

    find->setStatusTip(tr("查找"));

    //关于

    about = new QAction(QIcon(":/images/about.png"),tr("关于"),this);

    about->setStatusTip(tr("关于"));

    //字体

    fontLabel = new QLabel(tr("字体"));

    fontCom = new QFontComboBox();

    fontCom->setFontFilters(QFontComboBox::ScalableFonts);

    fontCom->setStatusTip(tr("字体设置"));

    //字号

    fontSizeLabel = new QLabel(tr("字号"));

    QFontDatabase db;

    fontSizeCom = new QComboBox();

    foreach(int size,db.standardSizes())

        fontSizeCom->addItem(QString::number(size));

    fontSizeCom->setStatusTip(tr("字号设置"));

    //关于

    aboutQt = new QAction(tr("关于QT"),this);

    aboutQt->setStatusTip(tr("关于Qt"));

}

//创建菜单

void MainWindow::createMenu(){

    //文件菜单

    file = menuBar()->addMenu(tr("文件(&F)"));

    file->addAction(newFile);

    file->addAction(openFile);

    file->addSeparator();

    file->addAction(save);

    file->addAction(saveAs);

    file->addSeparator();

    file->addAction(printText);

    file->addSeparator();

    file->addAction(exit);

    //编辑菜单

    edit = menuBar()->addMenu(tr("编辑(&E)"));

    edit->addAction(undoAction);

    edit->addAction(redoAction);

    edit->addSeparator();

    edit->addAction(cut);

    edit->addAction(copy);

    edit->addAction(paste);

    //插入菜单

    insert = menuBar()->addMenu(tr("插入(&I)"));

    insert->addAction(insertImg);

    insert->addAction(insertTable);

    //查找菜单

    search = menuBar()->addMenu(tr("查找(&F)"));

    search->addAction(find);

    //格式菜单

    style = menuBar()->addMenu(tr("格式(&S)"));

    style->addAction(bold);

    style->addAction(italic);

    style->addAction(underLine);

    style->addSeparator();

    style->addAction(color);

    style->addSeparator();

    style->addAction(left);

    style->addAction(center);

    style->addAction(right);

    style->addAction(justify);

    //帮助菜单

    help = menuBar()->addMenu(tr("帮助(&H)"));

    help->addAction(about);

    help->addAction(aboutQt);

}

//创建工具栏

void MainWindow::createToolBar(){

    //文件

    fileToolBar = addToolBar(tr("文件(&N)"));

    fileToolBar->addAction(newFile);

    fileToolBar->addAction(openFile);

    fileToolBar->addSeparator();

    fileToolBar->addAction(save);

    fileToolBar->addAction(saveAs);

    fileToolBar->addSeparator();

    fileToolBar->addAction(printText);

    fileToolBar->addSeparator();

    //编辑

    editToolBar = addToolBar(tr("编辑(&E)"));

    editToolBar->addAction(undoAction);

    editToolBar->addAction(redoAction);

    editToolBar->addSeparator();

    editToolBar->addAction(cut);

    editToolBar->addAction(copy);

    editToolBar->addAction(paste);

    //格式

    styleToolBar = addToolBar(tr("格式(&S)"));

    styleToolBar->addAction(bold);

    styleToolBar->addAction(italic);

    styleToolBar->addAction(underLine);

    styleToolBar->addSeparator();

    styleToolBar->addAction(left);

    styleToolBar->addAction(center);

    styleToolBar->addAction(right);

    styleToolBar->addAction(justify);

    styleToolBar->addSeparator();

    styleToolBar->addWidget(fontLabel);

    styleToolBar->addWidget(fontCom);

    styleToolBar->addWidget(fontSizeLabel);

    styleToolBar->addWidget(fontSizeCom);

    //插入

    insertToolBar = addToolBar(tr("插入(&I)"));

    insertToolBar->addAction(insertImg);

    insertToolBar->addAction(insertTable);

    insertToolBar->addSeparator();

    //查找

    searchToolBar = addToolBar(tr("查找(&F)"));

    searchToolBar->addAction(find);

    search->addSeparator();

}

//封装的读文件,用于精简程序

void MainWindow::fileRead(){

    QFile file(fileName);

    if(!file.open(QFile::ReadOnly|QFile::Text)){

         QMessageBox::warning(this,tr("多文档编辑器"),

                tr("不可以打开文件%1:\n%2").arg(fileName).arg(file.errorString()));

         return;

    }

        QTextStream in(&file);

        QApplication::setOverrideCursor(Qt::WaitCursor);

        textEdit->setPlainText(in.readAll());

        QApplication::restoreOverrideCursor();

}

//封装的写文件,用于精简程序

void MainWindow::fileWrite(){

    QFile file(fileName);

    if(!file.open(QFile::WriteOnly|QFile::Text)){

        QMessageBox::warning(this,tr("多文档编辑器"),

                             tr("不可以写入文件%1:/n%2").arg(fileName).arg(file.errorString()));

        return;

    }

    QTextStream out(&file);

    QApplication::setOverrideCursor(Qt::WaitCursor);

    out<<textEdit->toPlainText();

    QApplication::restoreOverrideCursor();

    return;

}

//新建文件

void MainWindow::NewFile(){

    MainWindow *newEdit = new MainWindow;

    newEdit->show();

}

//打开文件

void MainWindow::OpenFile(){

    fileName = QFileDialog::getOpenFileName(this,tr("打开文件"),"/","allFile(*.*)");

    if(!fileName.isEmpty()){

        if(textEdit->document()->isEmpty()){

            fileRead();

        }else{

            MainWindow *newEdit = new MainWindow;

            newEdit->show();

            QFile file(fileName);

            if(!file.open(QFile::ReadOnly|QFile::Text)){

                 QMessageBox::warning(this,tr("多文档编辑器"),

                        tr("不可以打开文件%1:\n%2").arg(fileName).arg(file.errorString()));

                 return;

            }

                QTextStream in(&file);

                QApplication::setOverrideCursor(Qt::WaitCursor);

                newEdit->textEdit->setPlainText(in.readAll());

                QApplication::restoreOverrideCursor();

        }

    }

}

//保存文件

void MainWindow::Save(){

    if(fileName.isEmpty()){

       fileName = QFileDialog::getSaveFileName(this,tr("另存为"),tr("未命名.txt"));

       fileWrite();

    }else{

        fileWrite();

    }

}

//另存为

void MainWindow::SaveAs(){

    fileName = QFileDialog::getSaveFileName(this,tr("另存为"),tr("未命名.txt"));

    fileWrite();

}

//字体设置

void MainWindow::FontComBox(QString fontComStr){

    QTextCharFormat format;

    format.setFontFamily(fontComStr);

    mergeFormat(format);

}

void MainWindow::mergeFormat(QTextCharFormat format){

    QTextCursor cursor = textEdit->textCursor();

    if(!cursor.hasSelection())

       cursor.select(QTextCursor::WordUnderCursor);

       cursor.mergeCharFormat(format);

       textEdit->mergeCurrentCharFormat(format);

}

//字号设置

void MainWindow::FontSizeCom(QString fontSizeStr){

    QTextCharFormat format;

    format.setFontPointSize(fontSizeStr.toFloat());

    textEdit->mergeCurrentCharFormat(format);

}

//颜色设置

void MainWindow::Color(){

    QColor color = QColorDialog::getColor(Qt::blue,this);

    if(color.isValid()){

        QTextCharFormat format;

        format.setForeground(color);

        textEdit->mergeCurrentCharFormat(format);

    }

}

//粗体

void MainWindow::Bold(){

    QTextCharFormat format;

    format.setFontWeight(bold->isChecked()?QFont::Bold:QFont::Normal);

    textEdit->mergeCurrentCharFormat(format);

}

//斜体

void MainWindow::Italic(){

    QTextCharFormat format;

    format.setFontItalic(italic->isChecked());

    textEdit->mergeCurrentCharFormat(format);

}

//下划线

void MainWindow::UnderLine(){

    QTextCharFormat format;

    format.setFontUnderline(underLine->isChecked());

    textEdit->mergeCurrentCharFormat(format);

}

//对齐

void MainWindow::ALignment(QAction *act){

    if(act == left){

        textEdit->setAlignment(Qt::AlignLeft);

    }else if(act == center){

        textEdit->setAlignment(Qt::AlignCenter);

    }else if(act == right){

        textEdit->setAlignment(Qt::AlignRight);

    }else if(act == justify){

        textEdit->setAlignment(Qt::AlignJustify);

    }

}

//插入图片

void MainWindow::InsertImage(){

    QTextCursor cursor = textEdit->textCursor();

    QTextImageFormat format;

    QString image = QFileDialog::getOpenFileName(this,"insert image","/","png(*.png)");

    format.setName(image);

    cursor.insertImage(format);

}

//插入表格,用到输入对话框

void MainWindow::InsertTable(){

    bool ok;

    int a = QInputDialog::getInt(this,tr("插入表格"),tr("输入行数:"),,,,,&ok);

    int b = QInputDialog::getInt(this,tr("插入表格"),tr("输入列数:"),,,,,&ok);

    if(ok){

        QTextCursor cursor = textEdit->textCursor();

        QTextTableFormat format;

        format.setCellSpacing();

        format.setCellPadding();

        cursor.insertTable(a,b,format);

    }

}

//查找

void MainWindow::Find(){

    QDialog *dialog = new QDialog(this);

    dialog->setWindowTitle(tr("查找"));

    lineEdit = new QLineEdit(dialog);

    label = new QLabel(this);

    btn = new QPushButton(dialog);

    btn->setText(tr("下一个"));

    connect(btn,SIGNAL(clicked()),this,SLOT(findNext()));

    layout = new QVBoxLayout();

    layout->addWidget(lineEdit);

    layout->addWidget(btn);

    dialog->setLayout(layout);

    dialog->resize(,);

    dialog->show();

}

void MainWindow::findNext(){

    QString str = lineEdit->text();

    bool isfind = textEdit->find(str,QTextDocument::FindBackward);

    if(isfind){

        label->setText(tr("查找目标在,行号:%1 列号:%2!").arg(textEdit->textCursor().blockNumber()).arg(textEdit->textCursor().columnNumber()));

        ui->statusBar->addPermanentWidget(label);

    }

}

//打印

void MainWindow::PrintText(){

    QPrinter printer;

    QPrintDialog printDialog(&printer,this);

    if(printDialog.exec()){

        QTextDocument *textDocument = textEdit->document();

        textDocument->print(&printer);

    }

}

//帮助

void MainWindow::About(){

    QMessageBox::about(this,tr("关于"),tr("这是一个文本编辑器"));

}

void MainWindow::AboutQt(){

    QMessageBox::aboutQt(this,tr("Qt编辑器"));

}

void MainWindow::showCurrentCharFormatChanged(const QTextCharFormat &form){

    fontCom->setCurrentIndex(fontCom->findText(form.fontFamily()));

    fontSizeCom->setCurrentIndex(fontSizeCom->findText(QString::number(form.fontPointSize())));

    bold->setChecked(form.font().bold());

    italic->setChecked(form.font().italic());

    underLine->setChecked(form.font().underline());

}

MainWindow::~MainWindow()

{

    delete ui;

}

main.cpp:

#include <QApplication>

#include "mainwindow.h"

int main(int argc, char *argv[])

{

    QApplication a(argc, argv);

    MainWindow w;

    w.show();

    return a.exec();

}

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