【qt】一个WPS项目了解qt界面设计的基本套路

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项目功能演示:

放心食用!最后有完整代码.
超级详细,期待您的一个点赞❥(^_-)

一览全局:

一.创建项目

用的是QMainWindow类,这个包含菜单,工具栏,状态栏.


能运行出来,就说明环境搭好了.

二.导入资源

三.ui设计

应用图标的添加.

四.字号选择框初始化

获取系统可支持的字号添加到选择框中,再设置当前系统字号

五.滚动条初始化

滚动条就是这个,这是用的后面做完的来演示的.

六.添加自定义文本类

记得添加宏Q_OBJECT,还有初始化父类

七.初始化action状态

八.新建文档

九.打开文件

十.保存与另存为

十一.打印/打印预览

十二.撤销重做剪切复制粘贴

十三.关闭事件/退出

十四.窗体菜单实现

十五.动态添加action/信号映射器

十六.字体颜色加粗斜体下划线

十七.文本对齐

十八.段落符号

void MainWindow::on_comboBoxStandard_activated(int index)
{
    TextEdit*edit=activateWindow();
    if(edit)
    {
        if(index==0)
        {
            QTextCursor cursor=edit->textCursor();
            cursor.beginEditBlock();

            QTextList*list=cursor.currentList();
            if(list)
            {
                list->remove(cursor.block());
                QTextBlockFormat blockFormat=cursor.blockFormat();
                blockFormat.setIndent(0);
                cursor.setBlockFormat(blockFormat);
            }
            cursor.endEditBlock();
            return;
        }
        QTextListFormat::Style style;//描述装饰列表项符号的枚举
        switch (index)
        {
        case 1:
            style=QTextListFormat::ListDisc;
            break;
        case 2:
            style=QTextListFormat::ListCircle;
            break;
        case 3:
            style=QTextListFormat::ListSquare;
            break;
        case 4:
            style=QTextListFormat::ListDecimal;
            break;
        case 5:
            style=QTextListFormat::ListLowerAlpha;
            break;
        case 6:
            style=QTextListFormat::ListUpperAlpha;
            break;
        case 7:
            style=QTextListFormat::ListLowerRoman;
            break;
        case 8:
            style=QTextListFormat::ListUpperRoman;
            break;
        default:
            style=QTextListFormat::ListStyleUndefined;//0
            break;
        }
        QTextCursor cursor=edit->textCursor();
        cursor.beginEditBlock();
        QTextBlockFormat blockFormat=cursor.blockFormat();
        QTextListFormat listFormat;

        QTextList*list=cursor.currentList();
        if(list)
        {
            listFormat=list->format();
            list->remove(cursor.block());

            blockFormat.setIndent(0);
            cursor.setBlockFormat(blockFormat);
        }

        listFormat.setStyle(style);
        cursor.createList(listFormat);
        cursor.endEditBlock();

    }
}

十九.字体字号

二十.打包

二十一.发布

二十二.完整代码

main.cpp

#include "mainwindow.h"

#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();
    return a.exec();
}

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include "textedit.h"
#include <QMdiSubWindow>
#include <QPrinter>
#include <QActionGroup>
#include <QSignalMapper>

QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = nullptr);
    ~MainWindow();

private slots:
    void on_NewAction_triggered();
    void setActionStatus(bool b);

    void on_OpenAction_triggered();

    void on_saveAction_triggered();

    void on_saveAsAction_triggered();

    void on_printAction_triggered();

    void on_printViewAction_triggered();

    void printPreview(QPrinter*printer);

    void on_undoAction_triggered();

    void on_redoAction_triggered();

    void on_cutAction_triggered();

    void on_copyAction_triggered();

    void on_pasteAction_triggered();

    void on_exitAction_triggered();

    void on_closeAction_triggered();

    void on_closeAllAction_triggered();

    void on_tileAction_triggered();

    void on_cascadeAction_triggered();

    void on_nextAction_triggered();

    void on_previousAction_triggered();

    void addSubWindowAction();

    void setActiveSubWindow(QWidget*widget);

    void on_colorAction_triggered();

    void on_blodAction_triggered();

    void on_italicAction_triggered();

    void on_underLineAction_triggered();

    void on_leftAlignAction_triggered();

    void on_centerAction_triggered();

    void on_rightAlignAction_triggered();

    void on_justifyAction_triggered();

    void on_comboBoxStandard_activated(int index);

    void on_fontComboBox_activated(const QString &arg1);

    void on_comboBoxFontSize_activated(const QString &arg1);

protected:
    void closeEvent(QCloseEvent *event)override;//重写关闭事件

private:
    Ui::MainWindow *ui;
    void init();//初始化函数
    void initFontSize();//初始化字号
    void initScrollBar();//初始化滚动条
    void initWindowAction();//初始化窗体相关的action
    void initDocAction();//初始化文本相关的action
    TextEdit* activateWindow();//获取当前活动窗口
    QMdiSubWindow * findSubWindow(const QString&docName);//获取相应文档的子窗体

    QActionGroup*actionGroup;
    QSignalMapper*mapper;
};
#endif // MAINWINDOW_H

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QFontDatabase>
#include <QMdiSubWindow>
#include <QFileDialog>
#include <QFileInfo>
#include <QPrinter>
#include <QPrintDialog>
#include <QPrintPreviewDialog>
#include <QCloseEvent>
#include <QColorDialog>
#include <QTextCharFormat>
#include <QTextList>

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this); 
    init();
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::init()
{
    ui->mdiArea->setBackground(QBrush(Qt::white));//用画刷设置mdi背景颜色
    initFontSize();
    initScrollBar();
    initWindowAction();
    //当窗口关闭时发送一次信号,重新设置窗口action. initWindowAction
    connect(ui->mdiArea,&QMdiArea::subWindowActivated,this,&MainWindow::initWindowAction);
    connect(ui->mdiArea,&QMdiArea::subWindowActivated,this,&MainWindow::initDocAction);
    initDocAction();

    actionGroup=new QActionGroup(this);
    actionGroup->setExclusive(true);//排他选择
    mapper=new QSignalMapper(this);
    connect(ui->menu_W,&QMenu::aboutToShow,this,&MainWindow::addSubWindowAction);
    connect(mapper,SIGNAL(mapped(QWidget*)),this,SLOT(setActiveSubWindow(QWidget*)));
}

void MainWindow::initFontSize()
{
    ui->comboBoxFontSize->clear();

    //QFontDatabase提供系统可用字体的相关信息
    for(int fontSize:QFontDatabase::standardSizes())//返回标准字体大小的列表
    {
        ui->comboBoxFontSize->addItem(QString::number(fontSize));//插入到字体选择框中
    }

    QFont appFont=QApplication::font();//当前系统默认字体
    int fontSize=appFont.pointSize(); //获取字体号
    int sizeIndex=ui->comboBoxFontSize->findText(QString::number(fontSize));
    ui->comboBoxFontSize->setCurrentIndex(sizeIndex);
}

void MainWindow::initScrollBar()
{
    //设置mdi的水平和垂直滚动条当需要的时候
    ui->mdiArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAsNeeded);
    ui->mdiArea->setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
}

void MainWindow::initWindowAction()
{
    bool hasActWindow=(activateWindow()!=nullptr);
    ui->saveAction->setEnabled(hasActWindow);
    ui->saveAsAction->setEnabled(hasActWindow);
    ui->printAction->setEnabled(hasActWindow);
    ui->printViewAction->setEnabled(hasActWindow);
    ui->undoAction->setEnabled(hasActWindow);
    ui->redoAction->setEnabled(hasActWindow);
    ui->pasteAction->setEnabled(hasActWindow);
    ui->closeAction->setEnabled(hasActWindow);
    ui->closeAllAction->setEnabled(hasActWindow);
    ui->tileAction->setEnabled(hasActWindow);
    ui->cascadeAction->setEnabled(hasActWindow);
    ui->nextAction->setEnabled(hasActWindow);
    ui->previousAction->setEnabled(hasActWindow);
}

void MainWindow::initDocAction()
{
    ui->cutAction->setEnabled(false);
    ui->copyAction->setEnabled(false);
    ui->colorAction->setEnabled(false);
    ui->blodAction->setEnabled(false);
    ui->italicAction->setEnabled(false);
    ui->underLineAction->setEnabled(false);
    ui->leftAlignAction->setEnabled(false);
    ui->centerAction->setEnabled(false);
    ui->rightAlignAction->setEnabled(false);
    ui->justifyAction->setEnabled(false);
}

TextEdit *MainWindow::activateWindow()
{
    QMdiSubWindow*window=ui->mdiArea->activeSubWindow();
    if(window)
    {
        return qobject_cast<TextEdit*>(window->widget());
    }
    return nullptr;
}

QMdiSubWindow *MainWindow::findSubWindow(const QString &docName)
{
    QString filepath=QFileInfo(docName).canonicalFilePath();//返回文件的绝对路径
    for(QMdiSubWindow*sub:ui->mdiArea->subWindowList())
    {
        TextEdit* edit=qobject_cast<TextEdit*>(sub->widget());
        if(edit->getDocFilePath()==filepath)
        {
            return sub;
        }
    }
    return nullptr;
}



void MainWindow::on_NewAction_triggered()
{
    TextEdit*edit=new TextEdit;
    ui->mdiArea->addSubWindow(edit);//edit父对象将是QMdiArea的viewport小部件
    //当文本编辑器选中或者取消选中会发出copyAvailable信号.
    connect(edit,&TextEdit::copyAvailable,this,&MainWindow::setActionStatus);
    edit->initNewDoc();
    edit->show();
}

void MainWindow::setActionStatus(bool b)
{
    ui->cutAction->setEnabled(b);
    ui->copyAction->setEnabled(b);
    ui->colorAction->setEnabled(b);
    ui->blodAction->setEnabled(b);
    ui->italicAction->setEnabled(b);
    ui->underLineAction->setEnabled(b);
    ui->leftAlignAction->setEnabled(b);
    ui->centerAction->setEnabled(b);
    ui->rightAlignAction->setEnabled(b);
    ui->justifyAction->setEnabled(b);
}

void MainWindow::on_OpenAction_triggered()
{
    QString docName=QFileDialog::getOpenFileName(this,"打开文档","./","所以文件(*.*)");
    if(!docName.isEmpty())
    {
        QMdiSubWindow*sub=findSubWindow(docName);
        if(sub)
        {
            ui->mdiArea->setActiveSubWindow(sub);
            return;
        }
        TextEdit*edit=new TextEdit;
        ui->mdiArea->addSubWindow(edit);
        connect(edit,&TextEdit::copyAvailable,this,&MainWindow::setActionStatus);
        if(edit->loadDoc(docName))
        {
            statusBar()->showMessage("文档已打开",3000);//3秒显示在状态栏
            edit->show();
        }
        else
        {
            edit->close();
        }
    }
}

void MainWindow::on_saveAction_triggered()
{
    TextEdit* edit=activateWindow();
    if(edit)
    {
        if(edit->saveDoc())
        {
            statusBar()->showMessage("文档已保存",3000);
        }
    }
}

void MainWindow::on_saveAsAction_triggered()
{
    TextEdit* edit=activateWindow();
    if(edit)
    {
        if(edit->saveAsDoc())
        {
            statusBar()->showMessage("文档已保存",3000);
        }
    }
}

void MainWindow::on_printAction_triggered()
{
    TextEdit* edit=activateWindow();
    if(!edit) return;
    //QPrinter::HighResolution将printer分辨率设置为正在使用的打印机分辨率
    QPrinter printer(QPrinter::HighResolution);
    QPrintDialog dialog(&printer,this);
    if(dialog.exec()==QDialog::Accepted)
    {
        edit->print(&printer);
    }
}

void MainWindow::on_printViewAction_triggered()
{
    TextEdit* edit=activateWindow();
    if(!edit) return;
    QPrinter printer;
    QPrintPreviewDialog preview(&printer,this);
    connect(&preview,&QPrintPreviewDialog::paintRequested,this,&MainWindow::printPreview);
    if(preview.exec()==QPrintPreviewDialog::Accepted)
    {
        edit->print(&printer);
    }
}

void MainWindow::printPreview(QPrinter*printer)
{
    TextEdit* edit=activateWindow();
    if(edit)
    {
        edit->print(printer);
    }
}

void MainWindow::on_undoAction_triggered()
{
    TextEdit*edit=activateWindow();
    if(edit)
    {
        edit->undo();
    }
}

void MainWindow::on_redoAction_triggered()
{
    TextEdit*edit=activateWindow();
    if(edit)
    {
        edit->redo();
    }
}

void MainWindow::on_cutAction_triggered()
{
    TextEdit*edit=activateWindow();
    if(edit)
    {
        edit->cut();
    }
}

void MainWindow::on_copyAction_triggered()
{
    TextEdit*edit=activateWindow();
    if(edit)
    {
        edit->copy();
    }
}

void MainWindow::on_pasteAction_triggered()
{
    TextEdit*edit=activateWindow();
    if(edit)
    {
        edit->paste();
    }
}

void MainWindow::closeEvent(QCloseEvent *event)
{
    ui->mdiArea->closeAllSubWindows();
    if(ui->mdiArea->currentSubWindow())
    {
        event->ignore();
    }
    else
    {
        event->accept();
    }
}

void MainWindow::on_exitAction_triggered()
{
    close();
}

void MainWindow::on_closeAction_triggered()
{
    ui->mdiArea->closeActiveSubWindow();
}

void MainWindow::on_closeAllAction_triggered()
{
    ui->mdiArea->closeAllSubWindows();
}

void MainWindow::on_tileAction_triggered()
{
    ui->mdiArea->tileSubWindows();
}

void MainWindow::on_cascadeAction_triggered()
{
    ui->mdiArea->cascadeSubWindows();
}

void MainWindow::on_nextAction_triggered()
{
    ui->mdiArea->activateNextSubWindow();
}

void MainWindow::on_previousAction_triggered()
{
    ui->mdiArea->activatePreviousSubWindow();
}

void MainWindow::addSubWindowAction()
{
    QList<QAction*> actionList=actionGroup->actions();
    if(!actionList.isEmpty())
    {
        for(QAction*action:actionList)
        {
            delete action;
        }
    }
    QList<QMdiSubWindow*>subWindowList=ui->mdiArea->subWindowList();//获取子窗体列表
    if(!subWindowList.isEmpty())ui->menu_W->addSeparator();//添加一个分隔符
    for(int i=0;i<subWindowList.count();i++)
    {
        QMdiSubWindow*subWindow=subWindowList[i];
        TextEdit*edit=qobject_cast<TextEdit*>(subWindow->widget());
        QString action_text=QString("%1 %2").arg(i+1).arg(edit->getDocWindowTitle());
        QAction* action=ui->menu_W->addAction(action_text);
        actionGroup->addAction(action);
        action->setCheckable(true);
        if(edit==activateWindow())action->setChecked(true);//设置选中
        connect(action,SIGNAL(triggered(bool)),mapper,SLOT(map()));
        mapper->setMapping(action,subWindow);
    }

}

void MainWindow::setActiveSubWindow(QWidget *widget)
{
    if(widget)ui->mdiArea->setActiveSubWindow(qobject_cast<QMdiSubWindow*>(widget));
}

void MainWindow::on_colorAction_triggered()
{
    TextEdit*edit=activateWindow();
    if(edit)
    {
        QColor color;
        color=QColorDialog::getColor();
        if(!color.isValid())return ;
        QTextCharFormat format;
        format.setForeground(color);
        edit->mergeCurrentCharFormat(format);

        QPixmap pixmap(24,24);
        pixmap.fill(color);
        ui->colorAction->setIcon(pixmap);
    }
}

void MainWindow::on_blodAction_triggered()
{
    TextEdit*edit=activateWindow();
    if(edit)
    {
        bool ischecked=ui->blodAction->isChecked();
        QTextCharFormat format;
        format.setFontWeight(ischecked?QFont::Bold:QFont::Normal);
        edit->mergeCurrentCharFormat(format);
    }
}

void MainWindow::on_italicAction_triggered()
{
    TextEdit*edit=activateWindow();
    if(edit)
    {
        QTextCharFormat format;
        format.setFontItalic(ui->italicAction->isChecked());
        edit->mergeCurrentCharFormat(format);
    }
}

void MainWindow::on_underLineAction_triggered()
{
    TextEdit*edit=activateWindow();
    if(edit)
    {
        QTextCharFormat format;
        format.setFontUnderline(ui->underLineAction->isChecked());
        edit->mergeCurrentCharFormat(format);
    }
}

void MainWindow::on_leftAlignAction_triggered()
{
    TextEdit*edit=activateWindow();
    if(edit)
    {
        edit->setAlignment(Qt::AlignLeft);
    }
}

void MainWindow::on_centerAction_triggered()
{
    TextEdit*edit=activateWindow();
    if(edit)
    {
        edit->setAlignment(Qt::AlignCenter);
    }
}

void MainWindow::on_rightAlignAction_triggered()
{
    TextEdit*edit=activateWindow();
    if(edit)
    {
        edit->setAlignment(Qt::AlignRight);
    }
}

void MainWindow::on_justifyAction_triggered()
{
    TextEdit*edit=activateWindow();
    if(edit)
    {
        edit->setAlignment(Qt::AlignJustify);
    }
}

void MainWindow::on_comboBoxStandard_activated(int index)
{
    TextEdit*edit=activateWindow();
    if(edit)
    {
        if(index==0)
        {
            QTextCursor cursor=edit->textCursor();
            cursor.beginEditBlock();

            QTextList*list=cursor.currentList();
            if(list)
            {
                list->remove(cursor.block());
                QTextBlockFormat blockFormat=cursor.blockFormat();
                blockFormat.setIndent(0);
                cursor.setBlockFormat(blockFormat);
            }
            cursor.endEditBlock();
            return;
        }
        QTextListFormat::Style style;//描述装饰列表项符号的枚举
        switch (index)
        {
        case 1:
            style=QTextListFormat::ListDisc;
            break;
        case 2:
            style=QTextListFormat::ListCircle;
            break;
        case 3:
            style=QTextListFormat::ListSquare;
            break;
        case 4:
            style=QTextListFormat::ListDecimal;
            break;
        case 5:
            style=QTextListFormat::ListLowerAlpha;
            break;
        case 6:
            style=QTextListFormat::ListUpperAlpha;
            break;
        case 7:
            style=QTextListFormat::ListLowerRoman;
            break;
        case 8:
            style=QTextListFormat::ListUpperRoman;
            break;
        default:
            style=QTextListFormat::ListStyleUndefined;//0
            break;
        }
        QTextCursor cursor=edit->textCursor();
        cursor.beginEditBlock();
        QTextBlockFormat blockFormat=cursor.blockFormat();
        QTextListFormat listFormat;

        QTextList*list=cursor.currentList();
        if(list)
        {
            listFormat=list->format();
            list->remove(cursor.block());

            blockFormat.setIndent(0);
            cursor.setBlockFormat(blockFormat);
        }

        listFormat.setStyle(style);
        cursor.createList(listFormat);
        cursor.endEditBlock();

    }
}

void MainWindow::on_fontComboBox_activated(const QString &arg1)
{
    TextEdit* edit=activateWindow();
    if(edit)
    {
        QTextCharFormat format;
        format.setFontFamily(arg1);
        edit->mergeCurrentCharFormat(format);
    }
}

void MainWindow::on_comboBoxFontSize_activated(const QString &arg1)
{
    TextEdit* edit=activateWindow();
    if(edit)
    {
        QTextCharFormat format;
        format.setFontPointSize(arg1.toInt());
        edit->mergeCurrentCharFormat(format);
    }
}

textedit.h

#ifndef TEXTEDIT_H
#define TEXTEDIT_H
#include <QTextEdit>

class TextEdit : public QTextEdit
{
     Q_OBJECT
public:
    TextEdit(QWidget*parent=nullptr);
    ~TextEdit();

    void initNewDoc(); //初始化新建文档
    QString getDocFilePath()const;//获取文件路径
    bool loadDoc(const QString&docName);//读取文件内容
    bool saveDoc();//保存文档
    bool saveAsDoc();//另存为
    QString getDocWindowTitle()const;

protected:
    void closeEvent(QCloseEvent *event)override;//重写关闭事件

private:
    QString getDocName()const;
    void initOpenDoc(const QString&docName);//初始化打开的文档
    bool writeToDoc(const QString&docName);//写文件
    bool promptSave();//提示是否保存

private slots:
    void setWindowModality();//设置WindowModality属性

private:
    QString docWindowTitle; //文档标题
    static int docNo;//文档编号
    QString docFilePath;//文档路径
};

#endif // TEXTEDIT_H

textedit.cpp

#include "textedit.h"
#include <QFile>
#include <QFileInfo>
#include <QFileDialog>
#include <QTextDocumentWriter>
#include <QCloseEvent>
#include <QMessageBox>

int TextEdit::docNo=1;

TextEdit::TextEdit(QWidget *parent):QTextEdit(parent)
{
    setAttribute(Qt::WA_DeleteOnClose);//关闭窗口时,释放资源
    docWindowTitle="";
    docFilePath="";//路径初始化为空可以区分是否是打开的文档
}

TextEdit::~TextEdit()
{

}

void TextEdit::initNewDoc()
{
    docWindowTitle=QString("文档 %1").arg(docNo++);

    //使用windowModified机制,添加[*]占位符
    //当窗口显示的文档未保存时,*就显示出来
    setWindowTitle(docWindowTitle + "[*]");
    //当文档内容发生改变,发出contentsChanged信号
    //document() 返回当前TextEdit文档
    connect(document(),&QTextDocument::contentsChanged,this,&TextEdit::setWindowModality);
}

QString TextEdit::getDocFilePath() const
{
    return this->docFilePath;
}

QString TextEdit::getDocName() const
{
    return QFileInfo(this->docFilePath).fileName();//获取文件名称
}

bool TextEdit::loadDoc(const QString &docName)
{
    if(!docName.isEmpty())
    {
        QFile file(docName);
        if(!file.exists())return false;//文件不存在
        if(!file.open(QFile::ReadOnly))return false;//打开文件失败
        QByteArray text=file.readAll();//读取文件内容
        if(Qt::mightBeRichText(text))//如果是富文件
        {
            setHtml(text);//富文本显示
        }
        else
        {
            setPlainText(text);//纯文本显示
        }
        initOpenDoc(docName);
    }
    return true;
}

bool TextEdit::saveDoc()
{
    if(document()->isModified())//文档是否被修改
    {
        if(!docFilePath.isEmpty())//路径是否为空
        {
            return writeToDoc(docFilePath);//写文件
        }
        else
        {
            return saveAsDoc();//另存为
        }
    }
    return false;
}

bool TextEdit::saveAsDoc()
{
    QString docName=QFileDialog::getSaveFileName(this,"另存为","./","HTML文档(*.html);;文本文件(*.txt)");
    if(docName.isEmpty())return false;
    return writeToDoc(docName);
}

QString TextEdit::getDocWindowTitle() const
{
    return this->docWindowTitle;
}

bool TextEdit::promptSave()
{
    if(!document()->isModified())
    {
        return true;
    }
    QMessageBox::StandardButton res;
    res=QMessageBox::warning(this,"提示",QString("%1已修改,是否保存?").arg(docWindowTitle),
                         QMessageBox::Yes|QMessageBox::No|QMessageBox::Cancel);
    if(res==QMessageBox::Yes)
    {
        return saveDoc();
    }
    else if(res==QMessageBox::No)
    {
        return true;
    }
    else if(res==QMessageBox::Cancel)
    {
        return false;
    }

}

void TextEdit::closeEvent(QCloseEvent *event)
{
    if(promptSave())
    {
        event->accept();
    }
    else
    {
        event->ignore();
    }
}

void TextEdit::initOpenDoc(const QString &docName)
{
    docFilePath=QFileInfo(docName).canonicalFilePath();
    docWindowTitle=getDocName()+" "+QString::number(docNo++);
    setWindowTitle(docWindowTitle + "[*]");
    connect(document(),&QTextDocument::contentsChanged,this,&TextEdit::setWindowModality);
}

bool TextEdit::writeToDoc(const QString &docName)
{
    //QTextDocumentWriter将QTextDocument写入文件
    QTextDocumentWriter docWriter(docName);
    if(docWriter.write(document()))
    {
        docFilePath=QFileInfo(docName).canonicalFilePath();
        document()->setModified(false);//文档未改动
        setWindowModified(false);//不显示占位符标识
    }
    return true;
}



void TextEdit::setWindowModality()
{
    setWindowModified(document()->isModified());//根据是否改动来设置是否显示*
}

二十三.最后

现在是2024年9月20日15:57:22,让时间见证这一切吧,继续前进!