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   源码介绍

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实现多窗口文本编辑

#include "subtext.h"
subText::subText(QWidget *parent) : QTextEdit(parent)
{
    isEdited = false;
    this->filename.clear();
    myFile = new QFile(this);

}

void subText::NewFile()
{
    static int index = 1;
    QString title = QString("未命名文档[%1][*]").arg(index);
    this->setWindowTitle(title);
    index ;
    //处于编辑后，启用*号
    connect(this->document(),SIGNAL(contentsChanged()),
            this, SLOT(doProcessContentsChanged()));

}

void subText::OpenFile()
{
    //获取要打开的文件
    QString ofilename = QFileDialog::getOpenFileName(this, "打开文本文件", ".", "TEXT(*.txt *.text *.cpp *.h);;ALL File(*.*)");
    if(ofilename.isEmpty())
    {
        return;
    }

    //保存文件路径，将文件设置到窗体
    this->filename = ofilename;

    //从路径中获取文件名
    QFileInfo info(filename);
    QString title = QString("%1[*]").arg(info.fileName());
    this->setWindowTitle(title);
    //处于编辑后，启用*号
    connect(this->document(),SIGNAL(contentsChanged()),
            this, SLOT(doProcessContentsChanged()));

    //文件的操作 用流的形式打开文件
    myFile->setFileName(filename);
    bool ret = myFile->open(QIODevice::ReadOnly|QIODevice::ReadOnly);
    if(!ret){
        QMessageBox::warning(this, "打开文件", "打开文件失败！");
        return;
    }
    QTextStream stream(myFile);
    //QString str = this->codeName;
    //QTextCodec::codecForName(str.toLocal8Bit())
    stream.setCodec(this->codeName.toLocal8Bit().data());
    while(!stream.atEnd()){
        QString str = stream.readLine();
        this->append(str);
    }
    myFile->close();
}

void subText::setCodeName(const QString codename)
{
    this->codeName = codename;
}

int subText::SaveFile()
{
    int ret = -1;
    if(!isEdited)
    {
        return -1;
    }
    if(this->filename.isEmpty()){
        QString savefilename = QFileDialog::getSaveFileName(this,
                                "保存提示", ".", "Text(*.txt *.text *.cpp *.h)");
        if(savefilename.isEmpty()){
            return ret;
        }
        this->filename = savefilename;
    }
    //对文件进行操作
    myFile->setFileName(this->filename);
    bool result = myFile->open(QIODevice::WriteOnly|QIODevice::Text);
    if(!result){
        QMessageBox::warning(this, "失败", "打开文件失败！");
        return ret;
    }
    QTextStream stream(myFile);
    //QString str = this->codeName;
    //QTextCodec::codecForName(str.toLocal8Bit())
    stream.setCodec(this->codeName.toLocal8Bit().data());
    stream<<this->toPlainText();
    //根据存储的文件名更改窗口名称
    QFileInfo info(filename);
    QString title = QString("%1[*]").arg(info.fileName());
    this->setWindowTitle(title);
    //处于编辑后，启用*号
    connect(this->document(),SIGNAL(contentsChanged()),
            this, SLOT(doProcessContentsChanged()));
    stream.flush();
    myFile->close();
    this->setWindowModified(false);
    isEdited =false;
    QMessageBox::information(this, "保存提示", "保存文件成功！");
    ret = 0;
    return ret;

}
void subText::SaveAsFile()
{

    bool tepIsEdited = this->isEdited;
    this->isEdited = true;
    QString tepfilename = this->filename;
    this->filename.clear();
    int ret = SaveFile();
    if(ret < 0){
        this->isEdited = tepIsEdited;
        this->filename = tepfilename;
    }
}



//关闭事件重写
void subText::closeEvent(QCloseEvent *event)
{
    if(!isEdited)
        {
        return;
        }
    QMessageBox::StandardButton ret;

    ret = QMessageBox::information(this, "保存提示", "你确定是否需要保存？",
                             QMessageBox::Yes|QMessageBox::No|QMessageBox::Cancel,QMessageBox::Yes);
    if(QMessageBox::Yes == ret){
        SaveFile();
        event->accept();
    }
    else if(QMessageBox::No == ret){
        event->accept();
    }
    else {
        event->ignore();
    }

}

void subText::contextMenuEvent(QContextMenuEvent *e)
{
    QMenu *myMenu = new QMenu(this);
    QAction *undo = myMenu->addAction(QIcon(":/image/undo.png"),
                      "撤销", this, SLOT(undo()), QKeySequence::Undo);
    undo->setEnabled(this->document()->isUndoAvailable());


    QAction *redo = myMenu->addAction(QIcon(":/image/redo.png"),
                      "恢复", this, SLOT(redo()), QKeySequence::Redo);
    redo->setEnabled(this->document()->isRedoAvailable());
    QAction *copy = myMenu->addAction(QIcon(":/image/copy.png"),
                      "复制", this, SLOT(copy()), QKeySequence::Copy);
    copy->setEnabled(this->textCursor().hasSelection());
    QAction *cut = myMenu->addAction(QIcon(":/image/cut.png"),
                      "剪切", this, SLOT(cut()), QKeySequence::Cut);
    cut->setEnabled(this->textCursor().hasSelection());
    QAction *paste = myMenu->addAction(QIcon(":/image/paste.png"),
                      "粘贴", this, SLOT(paste()), QKeySequence::Paste);
    paste->setEnabled(this->canPaste());
    QAction *clear = myMenu->addAction(QIcon(""),
                      "清除", this, SLOT(clear()),QKeySequence(tr("Ctrl D")));
    clear->setEnabled(!(this->document()->isEmpty()));
    QAction *selectall = myMenu->addAction(QIcon(""),
                      "全选", this, SLOT(selectAll()), QKeySequence::SelectAll);
    selectall->setEnabled(!(this->document()->isEmpty()));
    myMenu->exec(e->globalPos());
    //myMenu->show();
}



////////////slots function///////////

void subText::doProcessContentsChanged(){
    isEdited = true;
    this->setWindowModified(true);
}
////////////slots end///////////////