Qt: 记事本源代码

时间：2022-06-19 20:11:44

界面编程之实例学习，系统记事本是个极好的参考，初学Delphi及后之c#，皆以记事本为参考，今以Qt学习，亦是如此。

期间搭建开发环境，复习c++知识，寻找模块对应功能，不一而足；现刻录其模块代码，以做助记，功能接近系统记事本之95%。

学习了Qt事件驱动之信号槽机投、窗体间数据传递方法、文件编码、本地化等功能，然而初接触，仍不能得心应手。

IDE: VS2015+Qt5.8.0

界面如下：

Qt: 记事本源代码

直贴源代码吧！完成源码包，附于文后。

1、入口程序（main.cpp）：

#pragma execution_character_set("utf-8")

#include <QtWidgets/QApplication>

#include "qtranslator.h"

#include "notepad.h"

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

{

    QApplication a(argc, argv);

    //对话框类应用中文

    QTranslator user;

    bool ok = user.load("qt_zh_CN.qm", ".");

    a.installTranslator(&user);

    NotePad np;

    if (argc >= )

    {

        QString s = QString::fromLocal8Bit(argv[]);

        np.loadFromFile(s);

    }

    np.show();

    return a.exec();

}

2、主模块（notepad.cpp）：

#include <Windows.h>

#include <qfileinfo.h>

#include <qfile.h>

#include <qmimedata.h>

#include <qtextstream.h>

#include <qprinter.h>

#include <qprintdialog.h>

#include <qpagesetupdialog.h>

#include <qfiledialog.h>

#include <qfontdialog.h>

#include <qmessagebox.h>

#include <qtextobject.h>

#include <qdatetime.h>

#include <qsettings.h>

#include "notepad.h"

NotePad::NotePad(QWidget *parent)

    : QMainWindow(parent)

{

    ui.setupUi(this);

    //searchDialog = new SearchDialog(Q_NULLPTR, ui.textEdit);

    lblStatus = new QLabel();

    lblStatus->setAlignment(Qt::AlignRight);

    statusBar()->addPermanentWidget(lblStatus);

    setActionState();

    initTextEdifUI();

    loadSettings();

}

void NotePad::loadSettings()

{

    //大小&位置

    QSettings settings("HKEY_CURRENT_USER\\Software\\Microsoft\\Notepad", QSettings::NativeFormat);

    int x = settings.value("iWindowPosX", ).toInt();

    int y = settings.value("iWindowPosY", ).toInt();

    int w = settings.value("iWindowPosDX", ).toInt();

    int h = settings.value("iWindowPosDY", ).toInt();

    this->setGeometry(x, y, w, h);

    ui.actWordWrap->setChecked(settings.value("fWrap", true).toBool());

    ui.actStatus->setChecked(settings.value("StatusBar", true).toBool());

    ui.statusBar->setVisible(ui.actStatus->isChecked());

}

void NotePad::saveSettings()

{

    //大小&位置

    QSettings settings("HKEY_CURRENT_USER\\Software\\Microsoft\\Notepad", QSettings::NativeFormat);

    settings.setValue("iWindowPosX", this->x());

    settings.setValue("iWindowPosY", this->y());

    settings.setValue("iWindowPosDX", this->width());

    settings.setValue("iWindowPosDY", this->height());

    settings.setValue("fWrap", ui.actWordWrap->isChecked());

    settings.setValue("StatusBar", ui.actStatus->isChecked());

}

void NotePad::setFileName(QString fileName)

{

    this->fileName = fileName;

    ui.textEdit->document()->setModified(false);

    QString shownName;

    if (fileName.isEmpty())

        shownName = tr("未命名");

    else

        shownName = QFileInfo(fileName).fileName();

    setWindowTitle(tr("%1[*] - %2").arg(shownName, tr("记事本")));

    setWindowModified(false);

    lastDir = QFileInfo(fileName).absoluteDir().absolutePath();

}

void NotePad::loadFromFile(QString fileName)

{

    QFileInfo fileInfo(fileName);

    if (!fileInfo.isFile())

        return;

    QFile file(fileName);

    if (!file.open(QIODevice::ReadOnly))

    {

        QMessageBox::warning(this, tr("提示"), tr("不能打开此文件！"), tr("确定"));

        return;

    }

    setFileName(fileName);

    QTextStream in(&file);

    ui.textEdit->setText(in.readAll());

}

void NotePad::dragEnterEvent(QDragEnterEvent *event)

{

    if (event->mimeData()->hasFormat("text/uri-list"))

        event->acceptProposedAction();

}

void NotePad::dropEvent(QDropEvent *event)

{

    QList<QUrl> urls = event->mimeData()->urls();

    if (urls.isEmpty())

        return;

    QString fileName = urls.first().toLocalFile();

    if (!fileName.isEmpty())

        loadFromFile(fileName);

}

void NotePad::closeEvent(QCloseEvent * event)

{

    if (confirmSave())

    {

        saveSettings();

        event->accept();

    }

    else

        event->ignore();

}

bool NotePad::confirmSave()

{

    if (!ui.textEdit->document()->isModified())

        return true;

    QMessageBox::StandardButtons sb = QMessageBox::question(this, tr("提示"), tr("是否将更改保存到 %1？").arg(this->windowTitle().replace(tr(" - 记事本"), "")),

        tr("保存(&S)"), tr("不保存(&N)"), tr("取消"));

    switch (sb)

    {

    case :

        return saveFile();

    case :

        return true;

    case :

        return false;

    default:

        return true;

    }

}

bool NotePad::saveFile()

{

    if (this->fileName.isEmpty())

        return saveFileAs();

    return saveFile(this->fileName);

}

bool NotePad::saveFile(QString fileName)

{

    if (!ui.textEdit->document()->isModified())

        return false;

    QFile file(fileName);

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

    {

        QMessageBox::critical(this, tr("提示"), tr("不能写入文件！"), tr("确定"));

        return false;

    }

    QTextStream out(&file);

    out << ui.textEdit->toPlainText();

    setFileName(fileName);

    return true;

}

bool NotePad::saveFileAs()

{

    QString fileName = QFileDialog::getSaveFileName(this, tr("另存为"),

        lastDir + tr("./未命名.txt"), tr("文本文档(*.txt);;所有文件(*.*)"));

    if (fileName.isEmpty())

        return false;

    return saveFile(fileName);

}

void NotePad::setActionState()

{

    ui.actUndo->setEnabled(false);

    ui.actCopy->setEnabled(false);

    ui.actCut->setEnabled(false);

    ui.actDelete->setEnabled(false);

    ui.actFind->setEnabled(false);

    ui.actFindNext->setEnabled(false);

    ui.actGoto->setEnabled(false);

}

void NotePad::initTextEdifUI()

{

    QPalette palette = ui.textEdit->palette();

    palette.setColor(QPalette::Highlight, Qt::darkGreen);

    palette.setColor(QPalette::HighlightedText, Qt::white);

    ui.textEdit->setPalette(palette);

    ui.textEdit->setAcceptDrops(false);

    setAcceptDrops(true);

}

//槽函数

void NotePad::slotNew()

{

    if (!confirmSave())

        return;

    ui.textEdit->clear();

    setFileName("");

}

void NotePad::slotOpen()

{

    if (!confirmSave())

        return;

    QString fileName = QFileDialog::getOpenFileName(this, tr("另存为"),

        lastDir, tr("文本文档(*.txt);;所有文件(*.*)"));

    if (!fileName.isEmpty())

        loadFromFile(fileName);

}

void NotePad::slotSave()

{

    saveFile();

}

void NotePad::slotSaveAs()

{

    saveFileAs();

}

void NotePad::slotPageSetup()

{

    QPrinter printer;

    QPageSetupDialog pageSetUpdlg(&printer, this);

    if (pageSetUpdlg.exec() == QDialog::Accepted)

        printer.setOrientation(QPrinter::Landscape);

    else

        printer.setOrientation(QPrinter::Portrait);

}

void NotePad::slotPrint()

{

    QPrinter printer;

    QString printerName = printer.printerName();

    if (printerName.size() == )

        return;

    QPrintDialog dlg(&printer, this);

    if (ui.textEdit->textCursor().hasSelection())

        dlg.addEnabledOption(QAbstractPrintDialog::PrintSelection);

    // 如果在对话框中按下了打印按钮，则执行打印操作

    if (dlg.exec() == QDialog::Accepted)

        ui.textEdit->print(&printer);

}

void NotePad::slotExit()

{

    this->close();

}

void NotePad::slotUndo()

{

    ui.textEdit->undo();

}

void NotePad::slotCut()

{

    ui.textEdit->cut();

}

void NotePad::slotCopy()

{

    ui.textEdit->copy();

}

void NotePad::slotPaste()

{

    ui.textEdit->paste();

}

void NotePad::slotDelete()

{

    ui.textEdit->textCursor().removeSelectedText();

}

void NotePad::slotFind()

{

    if (replaceDialog != Q_NULLPTR && replaceDialog->isVisible())

    {

        replaceDialog->activateWindow();

        return;

    }

    if (searchDialog == Q_NULLPTR)

        searchDialog = new SearchDialog(this, ui.textEdit);

    searchDialog->show();

    searchDialog->activateWindow();

}

void NotePad::slotFindNext()

{

    if (searchDialog == Q_NULLPTR)

        searchDialog = new SearchDialog(this, ui.textEdit);

    searchDialog->search();

}

void NotePad::slotReplace()

{

    if (searchDialog != Q_NULLPTR && searchDialog->isVisible())

    {

        searchDialog->activateWindow();

        return;

    }

    if (replaceDialog == Q_NULLPTR)

        replaceDialog = new ReplaceDialog(this, ui.textEdit);

    replaceDialog->show();

    replaceDialog->activateWindow();

}

void NotePad::slotGoto()

{

    //跳转...传this以此做为其窗主，Modal状态标题栏闪烁

    GotoDialog gotoDialog(this);

    gotoDialog.setLineNumber(ui.textEdit->textCursor().blockNumber() + , ui.textEdit->document()->lineCount());

    if (gotoDialog.exec() == QDialog::Accepted)

    {

        int line = gotoDialog.gotoLine;

        QTextCursor cursor = ui.textEdit->textCursor();

        int position = ui.textEdit->document()->findBlockByNumber(line - ).position();

        cursor.setPosition(position, QTextCursor::MoveAnchor);

        ui.textEdit->setTextCursor(cursor);

    }

}

void NotePad::slotSelectAll()

{

    ui.textEdit->selectAll();

}

void NotePad::slotDatetime()

{

    QString dateTime = QDateTime::currentDateTime().toString(Qt::SystemLocaleDate);

    ui.textEdit->textCursor().insertText(dateTime);

}

void NotePad::slotWordWrap()

{

    if (ui.actWordWrap->isChecked())

        ui.textEdit->setWordWrapMode(QTextOption::WordWrap);

    else

        ui.textEdit->setWordWrapMode(QTextOption::NoWrap);

    ui.actGoto->setEnabled(!ui.actWordWrap->isChecked());

    ui.actStatus->setEnabled(ui.actWordWrap->isChecked());

    if (!ui.actWordWrap->isChecked())

    {

        if (ui.actStatus->isChecked())

        {

            ui.actStatus->setChecked(false);

            ui.statusBar->setVisible(ui.actStatus->isChecked());

        }

    }

    else if (this->statusChecked)

        ui.actStatus->trigger();

}

void NotePad::slotFont()

{

    bool ok;

    QFont font = QFontDialog::getFont(&ok, ui.textEdit->font());

    if (ok)

        ui.textEdit->setFont(font);

}

void NotePad::slotStatus()

{

    this->statusChecked = ui.actStatus->isChecked();

    ui.statusBar->setVisible(ui.actStatus->isChecked());

}

void NotePad::slotHelp()

{

    QMessageBox::warning(this, tr("提示"), tr("黔驴技穷，搞不定[IHxHelpPane->(\"mshelp://windows/?id=e725b43f-94e4-4410-98e7-cc87ab2739aa\")]"), tr("确定"));

    //HxHelpPane *helpPane = new HxHelpPane();

    //CoInitialize(NULL);

    //IHxHelpPane *helpPane = NULL;

    //HRESULT hr = ::CoCreateInstance(CLSID_HxHelpPane, NULL, CLSCTX_ALL, IID_IHxHelpPane, reinterpret_cast<void**>(&helpPane));

    //if (SUCCEEDED(hr))

    //    helpPane->DisplayTask(BSTR("mshelp://windows/?id=e725b43f-94e4-4410-98e7-cc87ab2739aa"));

}

void NotePad::slotAbout()

{

    QString appPath = QApplication::applicationFilePath();

    HICON icon = ExtractIcon(NULL, appPath.toStdWString().c_str(), );

    ShellAbout((HWND)this->winId(), tr("Qt记事本").toStdWString().c_str(), tr("作者：刘景威").toStdWString().c_str(), icon);

}

void NotePad::slotCopyAvailable(bool enabled)

{

    ui.actCopy->setEnabled(enabled);

}

void NotePad::slotCursorPositionChanged()

{

    QTextCursor tc = ui.textEdit->textCursor();

    QString info = tr("第%1行，第%2列  ").arg(tc.blockNumber() + ).arg(tc.columnNumber());

    lblStatus->setText(info);

}

void NotePad::slotRedoAvailable(bool enabled)

{

}

void NotePad::slotSelectionChanged()

{

    QString selecdedText = ui.textEdit->textCursor().selectedText();

    //ui.actUndo

    ui.actCopy->setEnabled(!selecdedText.isEmpty());

    ui.actCut->setEnabled(!selecdedText.isEmpty());

    ui.actDelete->setEnabled(!selecdedText.isEmpty());

}

void NotePad::slotTextChanged()

{

    slotSelectionChanged();

    QString text = ui.textEdit->toPlainText();

    ui.actFind->setEnabled(text != "");

    ui.actFindNext->setEnabled(text != "");

    ui.actGoto->setEnabled(text != "" && !ui.actWordWrap->isChecked());

}

void NotePad::slotUndoAvailable(bool enabled)

{

    ui.actUndo->setEnabled(enabled);

}

3、跳转模块（goto.cpp）

#include "qmessagebox.h"

#include "goto.h"

GotoDialog::GotoDialog(QWidget *parent) :

    QDialog(parent)

{

    ui.setupUi(this);

    setWindowFlags(Qt::Dialog | Qt::WindowCloseButtonHint | Qt::MSWindowsFixedSizeDialogHint);

    ui.label->setBuddy(ui.lineEdit);

    QRegExp regx("[0-9]+$");

    QValidator *validator = new QRegExpValidator(regx, this);

    ui.lineEdit->setValidator(validator);

}

GotoDialog::~GotoDialog()

{

}

void GotoDialog::setLineNumber(int currLine, int maxLineCount)

{

    ui.lineEdit->setText(QString::number(currLine));

    ui.lineEdit->selectAll();

    this->maxLineCount = maxLineCount;

}

void GotoDialog::accept()

{

    QString value = ui.lineEdit->text().trimmed();

    if (value.isEmpty())

    {

        this->showMessage(tr("请输入要跳到的行数。"));

        return;

    }

    if (value.toInt() > this->maxLineCount)

    {

        this->showMessage(tr("行数超过了总行数。"));

        return;

    }

    this->gotoLine = value.toInt();

    return QDialog::accept();

}

void GotoDialog::showMessage(QString title)

{

    QMessageBox::warning(this, tr("记事本 - 跳行"), title, tr("确定"));

}

4、查找功能（search.cpp）：

#include "qmessagebox.h"

#include "qtextedit.h"

#include "qtextdocument.h"

#include "search.h"

SearchDialog::SearchDialog(QWidget *parent, QTextEdit *textEdit) :

    QDialog(parent),

    textEdit(textEdit)

{

    ui.setupUi(this);

    setWindowFlags(Qt::Dialog | Qt::WindowCloseButtonHint | Qt::MSWindowsFixedSizeDialogHint);

    ui.label->setBuddy(ui.lineEdit);

    ui.searchButton->setEnabled(false);

    QObject::connect(ui.searchButton, SIGNAL(clicked()), this, SLOT(search()));

    QObject::connect(ui.lineEdit, &QLineEdit::textChanged, [=]()

    {

        ui.searchButton->setEnabled(ui.lineEdit->text() != "");

    });

}

SearchDialog::~SearchDialog()

{

}

void SearchDialog::activateWindow()

{

    QDialog::activateWindow();

    ui.lineEdit->setText(textEdit->textCursor().selectedText());

    ui.lineEdit->selectAll();

}

//此重载方法实现选择数据填充，置入上面函数中

//void SearchDialog::show(QString text)

//{

//    QDialog::show();

//    if (text != "")

//        ui.lineEdit->setText(text);

//}

void SearchDialog::search()

{

    QString text = ui.lineEdit->text();

    if (text.isEmpty())

        return;

    QTextDocument::FindFlags findFlags;

    if (ui.cbCaseSensitive->isChecked())

        findFlags = QTextDocument::FindCaseSensitively;

    if (ui.rbUp->isChecked())

        findFlags |= QTextDocument::FindBackward;

    bool found = textEdit->find(text, findFlags);

    if (!found)

        QMessageBox::information(this, tr("记事本"), tr("找不到\"%1\"").arg(text), QMessageBox::Ok);

}

5、替换功能（replace.cpp）：

#include "qmessagebox.h"

#include "qtextedit.h"

#include "qtextdocument.h"

#include "replace.h"

ReplaceDialog::ReplaceDialog(QWidget *parent, QTextEdit *textEdit) :

    QDialog(parent),

    textEdit(textEdit)

{

    ui.setupUi(this);

    setWindowFlags(Qt::Dialog | Qt::WindowCloseButtonHint | Qt::MSWindowsFixedSizeDialogHint);

    initDialog();

}

ReplaceDialog::~ReplaceDialog()

{

}

void ReplaceDialog::initDialog()

{

    ui.label->setBuddy(ui.lineEdit);

    ui.lblReplace->setBuddy(ui.replaceEdit);

    ui.searchButton->setEnabled(false);

    ui.replaceButton->setEnabled(false);

    ui.replaceAllButton->setEnabled(false);

    QObject::connect(ui.searchButton, SIGNAL(clicked()), this, SLOT(search()));

    QObject::connect(ui.replaceButton, SIGNAL(clicked()), this, SLOT(replace()));

    QObject::connect(ui.replaceAllButton, SIGNAL(clicked()), this, SLOT(replaceAll()));

    QObject::connect(ui.lineEdit, &QLineEdit::textChanged, [=]()

    {

        ui.searchButton->setEnabled(ui.lineEdit->text() != "");

        ui.replaceButton->setEnabled(ui.lineEdit->text() != "");

        ui.replaceAllButton->setEnabled(ui.lineEdit->text() != "");

    });

}

void ReplaceDialog::activateWindow()

{

    QDialog::activateWindow();

    ui.lineEdit->setText(textEdit->textCursor().selectedText());

    ui.lineEdit->selectAll();

}

bool ReplaceDialog::search(bool showWarn)

{

    QString text = ui.lineEdit->text();

    if (text.isEmpty())

        return false;

    QTextDocument::FindFlags findFlags;

    if (ui.cbCaseSensitive->isChecked())

        findFlags = QTextDocument::FindCaseSensitively;

    bool found = textEdit->find(text, findFlags);

    if (!found && showWarn)

        QMessageBox::information(this, tr("记事本"), tr("找不到\"%1\"").arg(text), QMessageBox::Ok);

    return found;

}

void ReplaceDialog::replace()

{

    bool found = search();

    if (!found)

        return;

    QTextCursor textCursor = textEdit->textCursor();

    QString replaceText = ui.replaceEdit->text();

    textCursor.insertText(replaceText);

    //寻找下一个

    search();

}

void ReplaceDialog::replaceAll()

{

    QString text = ui.lineEdit->text();

    if (text.isEmpty())

        return;

    QTextDocument::FindFlags findFlags;

    if (ui.cbCaseSensitive->isChecked())

        findFlags = QTextDocument::FindCaseSensitively;

    QString replaceText = ui.replaceEdit->text();

    while (textEdit->find(text, findFlags))

    {

        QTextCursor textCursor = textEdit->textCursor();

        textCursor.insertText(replaceText);

    }

    //往回找

    findFlags |= QTextDocument::FindBackward;

    while (textEdit->find(text, findFlags))

    {

        QTextCursor textCursor = textEdit->textCursor();

        textCursor.insertText(replaceText);

    }

}

源码下载：

https://files.cnblogs.com/files/crwy/qt_notepad.rar

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