QT-window记事本

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一、演示效果

二、核心代码

#include <QMessageBox>
#include <QFileDialog>
#include <QDebug>
#include <QProcess>
#include <QDesktopServices>
#include <QDateTime>
#include <QFontDialog>
#include <QTextBlock>
#include <QFileIconProvider>
#include "mainwindow.h"
#include "ui_mainwindow.h"MainWindow::MainWindow(QWidget *parent): QMainWindow(parent), ui(new Ui::MainWindow),settings("MyNotepad")
{ui->setupUi(this);// 读取设置if (!settings.value("wordWrap", true).toBool()){ui->actionWord_Wrap_W->setChecked(false);ui->plainTextEdit->setWordWrapMode(QTextOption::NoWrap);}if (!settings.value("statusBar", true).toBool()){this->statusBar()->hide();ui->actionStatus_Bar_S->setChecked(false);}// 恢复字体QString fs;if (!(fs = settings.value("font").toString()).isEmpty()){QFont f;f.fromString(fs);ui->plainTextEdit->setFont(f);}// 状态栏posLabel = new QLabel(u8"第 1 行，第 1 列", this);zoomLabel = new QLabel(u8"100%", this);lineLabel = new QLabel(u8"Windows (CRLF)", this);codecLabel = new QLabel(u8"GBK", this);ui->statusbar->addPermanentWidget(new QLabel(this), 6);ui->statusbar->addPermanentWidget(posLabel, 3);ui->statusbar->addPermanentWidget(zoomLabel, 1);ui->statusbar->addPermanentWidget(lineLabel, 3);ui->statusbar->addPermanentWidget(codecLabel, 1);// 设置为系统notepad图标QFileIconProvider ip;QIcon icon = ip.icon(QFileInfo("C:\\Windows\\System32\\notepad.exe"));qApp->setWindowIcon(icon);
}MainWindow::~MainWindow()
{delete ui;
}void MainWindow::openFile(QString path)
{filePath = path;if (path.isEmpty()){savedContent = "";fileName = u8"无标题";}else{QFile file(path);if (!file.exists()){qWarning() << u8"文件不存在";return ;}fileName = QFileInfo(path).baseName();// 读取文件if (!file.open(QIODevice::ReadOnly)){qWarning() << u8"打开文件失败";return ;}savedContent = QString::fromLocal8Bit(file.readAll());}ui->plainTextEdit->setPlainText(savedContent);updateWindowTitle();
}bool MainWindow::isModified() const
{return ui->plainTextEdit->toPlainText() != savedContent;
}/*** @brief MainWindow::askSave* @return 是否继续*/
bool MainWindow::askSave()
{if (!isModified())return true;// 有未保存的更改int btn = QMessageBox::question(this, u8"记事本", u8"你想更改保存到 " + (fileName.isEmpty() ? u8"无标题" : fileName) + u8" 吗？", u8"保存(&S)", u8"不保存(&N)", u8"取消");if (btn == 2) // 取消return false;if (btn == 0) // 保存{return on_actionSave_triggered();}return true;
}void MainWindow::updateWindowTitle()
{this->setWindowTitle((isModified() ? "*" : "") + fileName + u8" - 记事本");
}void MainWindow::createFindDialog()
{findDialog = new FindDialog(settings, this);connect(findDialog, &FindDialog::signalShow, this, [=]{ui->actionFind_Next_N->setEnabled(true);ui->actionFind_Prev_V->setEnabled(true);});connect(findDialog, &FindDialog::signalHide, this, [=]{ui->actionFind_Next_N->setEnabled(false);ui->actionFind_Prev_V->setEnabled(false);});/* connect(findDialog, &FindDialog::signalTextChanged, this, [=](const QString& text){this->findText = text;}); */connect(findDialog, &FindDialog::signalFindNext, this, &MainWindow::on_actionFind_Next_N_triggered);connect(findDialog, &FindDialog::signalFindPrev, this, &MainWindow::on_actionFind_Prev_V_triggered);connect(findDialog, &FindDialog::signalReplaceNext, this, [=]{const QString& findText = findDialog->getFindText();const QString& replaceText = findDialog->getReplaceText();if (findText.isEmpty())return ;// 替换 逻辑上分为：查找、选中、替换const QString& selectedText = ui->plainTextEdit->textCursor().selectedText();if ((findDialog->isCaseSensitive() && selectedText != findText)|| selectedText.toLower() != findText.toLower()){// 如果选中的词不是findText，则查找下一个on_actionFind_Next_N_triggered();qInfo() << u8"查找：" << findText;}else{// 已选中，则替换选中的QTextCursor tc = ui->plainTextEdit->textCursor();tc.insertText(replaceText);ui->plainTextEdit->setTextCursor(tc);qInfo() << u8"替换：" << findText << "->" << replaceText;on_actionFind_Next_N_triggered(); // 查找下一个}});connect(findDialog, &FindDialog::signalReplaceAll, this, [=]{const QString& findText = findDialog->getFindText();const QString& replaceText = findDialog->getReplaceText();if (findText.isEmpty())return ;qInfo() << u8"全部替换：" << findText << "->" << replaceText;QString content = ui->plainTextEdit->toPlainText();QTextCursor tc = ui->plainTextEdit->textCursor();tc.setPosition(0);tc.setPosition(content.length(), QTextCursor::KeepAnchor);content.replace(findText, replaceText);tc.insertText(content);// ui->plainTextEdit->setTextCursor(tc);     // 不调用这句话，保留替换之前的位置// ui->plainTextEdit->setPlainText(content); // 这个会导致无法撤销，而且会重置光标位置到开头});
}void MainWindow::showEvent(QShowEvent *e)
{this->restoreGeometry(settings.value("mainwindow/geometry").toByteArray());this->restoreState(settings.value("mainwindow/state").toByteArray());QMainWindow::showEvent(e);
}void MainWindow::closeEvent(QCloseEvent *e)
{if (!askSave()){e->ignore();return ;}settings.setValue("mainwindow/geometry", this->saveGeometry());settings.setValue("mainwindow/state", this->saveState());QMainWindow::closeEvent(e);
}void MainWindow::on_plainTextEdit_textChanged()
{if (fileName.isEmpty())fileName = u8"无标题";updateWindowTitle();bool empty = ui->plainTextEdit->toPlainText().isEmpty();ui->actionFind_F->setEnabled(!empty);ui->actionReplace_R->setEnabled(!empty);ui->actionFind_Next_N->setEnabled(!empty && findDialog && findDialog->isVisible());ui->actionFind_Prev_V->setEnabled(!empty && findDialog && findDialog->isVisible());
}void MainWindow::on_plainTextEdit_cursorPositionChanged()
{QTextCursor tc = ui->plainTextEdit->textCursor();QTextLayout* ly = tc.block().layout();int posInBlock = tc.position() - tc.block().position(); // 当前光标在block内的相对位置int line = ly->lineForTextPosition(posInBlock).lineNumber() + tc.block().firstLineNumber();int col = tc.columnNumber(); // 第几列// int row = tc.blockNumber(); // 第几段，无法识别WordWrap的第几行posLabel->setText(u8"第 " + QString::number(line + 1) + u8" 行，第 " + QString::number(col + 1) + u8" 列");
}void MainWindow::on_plainTextEdit_undoAvailable(bool b)
{ui->actionUndo_U->setEnabled(b);
}void MainWindow::on_plainTextEdit_selectionChanged()
{bool selected = ui->plainTextEdit->textCursor().hasSelection();ui->actionSearch_By_Bing->setEnabled(selected);ui->actionCut_T->setEnabled(selected);ui->actionCopy_C->setEnabled(selected);ui->actionDelete_L->setEnabled(selected);ui->actionReselect_Chinese->setEnabled(selected);
}void MainWindow::on_actionNew_triggered()
{if (!askSave())return ;openFile("");
}void MainWindow::on_actionNew_Window_triggered()
{QProcess p(this);p.startDetached(QApplication::applicationFilePath(), {"-new"});
}void MainWindow::on_actionOpen_triggered()
{if (!askSave())return ;QString recentPath = settings.value("recent/filePath").toString();QString path = QFileDialog::getOpenFileName(this, u8"打开", recentPath, "*.txt");if (path.isEmpty())return ;openFile(path);
}bool MainWindow::on_actionSave_triggered()
{if (filePath.isEmpty()) // 没有路径，另存为{QString recentPath = settings.value("recent/filePath").toString();QString path = QFileDialog::getSaveFileName(this, u8"另存为", recentPath, "*.txt");if (path.isEmpty())return false;settings.setValue("recent/filePath", path);filePath = path;fileName = QFileInfo(path).baseName();}// 写出文件QFile file(filePath);if (!file.open(QIODevice::WriteOnly)){qWarning() << "打开文件失败";return false;}QTextStream ts(&file);ts.setCodec("GBK");savedContent = ui->plainTextEdit->toPlainText();ts << savedContent;file.close();qInfo() << "save:" << filePath << savedContent.length();updateWindowTitle();return true;
}bool MainWindow::on_actionSave_As_triggered()
{QString temp = filePath;filePath = "";if (!on_actionSave_triggered()) // 直接调用保存的filePath = temp;return true;
}void MainWindow::on_actionExit_triggered()
{if (!askSave())return ;this->close();
}void MainWindow::on_actionUndo_U_triggered()
{ui->plainTextEdit->undo();
}void MainWindow::on_actionCut_T_triggered()
{ui->plainTextEdit->cut();
}void MainWindow::on_actionCopy_C_triggered()
{ui->plainTextEdit->copy();
}void MainWindow::on_actionPaste_P_triggered()
{ui->plainTextEdit->paste();
}void MainWindow::on_actionDelete_L_triggered()
{QTextCursor tc = ui->plainTextEdit->textCursor();int pos = tc.position();if (pos >= ui->plainTextEdit->toPlainText().length())return ;tc.setPosition(pos + 1, QTextCursor::MoveMode::KeepAnchor);tc.removeSelectedText();
}void MainWindow::on_actionSearch_By_Bing_triggered()
{// !这里是转到UTF-8，保存到txt是保存为GBKQByteArray key = ui->plainTextEdit->textCursor().selectedText().toUtf8().toPercentEncoding();QDesktopServices::openUrl(QUrl("https://cn.bing.com/search?q=" + key + "&form=NPCTXT"));
}void MainWindow::on_actionSelect_All_A_triggered()
{ui->plainTextEdit->selectAll();
}void MainWindow::on_actionTime_Date_D_triggered()
{ui->plainTextEdit->insertPlainText(QDateTime::currentDateTime().toString("hh:mm yyyy/MM/dd"));
}void MainWindow::on_actionWord_Wrap_W_triggered()
{if (ui->plainTextEdit->wordWrapMode() == QTextOption::NoWrap){ui->plainTextEdit->setWordWrapMode(QTextOption::WordWrap);ui->actionWord_Wrap_W->setChecked(true);settings.setValue("wordWrap", true);}else{ui->plainTextEdit->setWordWrapMode(QTextOption::NoWrap);ui->actionWord_Wrap_W->setChecked(false);settings.setValue("wordWrap", false);}
}void MainWindow::on_actionFont_F_triggered()
{bool ok;QFont f = QFontDialog::getFont(&ok, ui->plainTextEdit->font(), this, u8"字体");if (!ok)return ;ui->plainTextEdit->setFont(f);settings.setValue("font", f.toString());
}void MainWindow::on_actionZoom_In_I_triggered()
{if (zoomSize >= 500)return ;ui->plainTextEdit->zoomIn(1);zoomSize += 10;zoomLabel->setText(QString::number(zoomSize) + "%");
}void MainWindow::on_actionZoom_Out_O_triggered()
{if (zoomSize <= 10)return ;ui->plainTextEdit->zoomOut(1);zoomSize -= 10;zoomLabel->setText(QString::number(zoomSize) + "%");
}void MainWindow::on_actionZoom_Default_triggered()
{QString fs;if (!(fs = settings.value("font").toString()).isEmpty()){QFont f;f.fromString(fs);ui->plainTextEdit->setFont(f);}else{ui->plainTextEdit->setFont(qApp->font());}zoomSize = 100;zoomLabel->setText(QString::number(zoomSize) + "%");
}void MainWindow::on_actionStatus_Bar_S_triggered()
{if (this->statusBar()->isHidden()){this->statusBar()->show();ui->actionStatus_Bar_S->setChecked(true);settings.setValue("statusBar", true);}else{this->statusBar()->hide();ui->actionStatus_Bar_S->setChecked(false);settings.setValue("statusBar", false);}
}void MainWindow::on_actionAbout_A_triggered()
{QMessageBox::about(this, u8"关于", u8"高仿 Windows 记事本的 Qt 实现方案");
}void MainWindow::on_actionFind_F_triggered()
{if (!findDialog){createFindDialog();}findDialog->openFind(false);
}void MainWindow::on_actionFind_Next_N_triggered()
{const QString& text = findDialog->getFindText();if (text.isEmpty())return ;QTextDocument::FindFlags flags;if (findDialog->isCaseSensitive())flags |= QTextDocument::FindCaseSensitively;bool rst = ui->plainTextEdit->find(text, flags);if (!rst && findDialog->isLoop()&& ui->plainTextEdit->toPlainText().contains(text)) // 没找到，尝试从头开始{qInfo() << "从开头查找";QTextCursor tc = ui->plainTextEdit->textCursor();tc.setPosition(0);ui->plainTextEdit->setTextCursor(tc);on_actionFind_Next_N_triggered();}
}void MainWindow::on_actionFind_Prev_V_triggered()
{const QString& text = findDialog->getFindText();if (text.isEmpty())return ;QTextDocument::FindFlags flags = QTextDocument::FindBackward;if (findDialog->isCaseSensitive())flags |= QTextDocument::FindCaseSensitively;bool rst = ui->plainTextEdit->find(text, flags);if (!rst && findDialog->isLoop()&& ui->plainTextEdit->toPlainText().contains(text)){qInfo() << "从末尾查找";QTextCursor tc = ui->plainTextEdit->textCursor();tc.setPosition(ui->plainTextEdit->toPlainText().length());ui->plainTextEdit->setTextCursor(tc);on_actionFind_Prev_V_triggered();}
}void MainWindow::on_actionReplace_R_triggered()
{if (!findDialog){createFindDialog();}findDialog->openFind(true);
}void MainWindow::on_actionGoto_G_triggered()
{// TODO:转到// 我的记事本这个选项一直是灰色的
}void MainWindow::on_actionHelp_triggered()
{QDesktopServices::openUrl(QUrl("https://github.com/iwxyi/Qt-notepad"));
}void MainWindow::on_actionFeedback_F_triggered()
{QDesktopServices::openUrl(QUrl("https://github.com/iwxyi/Qt-notepad/issues"));
}void MainWindow::on_plainTextEdit_customContextMenuRequested(const QPoint&)
{QMenu* menu = new QMenu();QMenu* insertUnicodeControlCharsMenu = new QMenu("插入 Unicode 控制字符(&I)", menu);QList<QPair<QString, QString>> unicodeControlChars{{"LRM", "&Left-to-right mark"},{"RLM", "&Right-to-left mark"},{"ZWJ", "Zero width joiner"},{"ZWNJ", "Zero width &non-joiner"},{"LRE", "Start of left-to-right &embedding"},{"RLE", "Start of right-to-left e&mbedding"},{"LRO", "Start of left-to-right &override"},{"RLO", "Start of right-to-left o&verride"},{"PDF", "&Pop directional formatting"},{"NADS", "N&ational digit shapes substitution"},{"NODS", "Nominal (European) &digit shapes"},{"ASS", "Activate &symmetric swapping"},{"ISS", "Inhibit s&ymmetric swapping"},{"AAFS", "Activate Arabic &form shaping"},{"IAFS", "Inhibit Arabic form s&haping"},{"RS", "Record Separator (&Block separator)"},{"US", "Unit Separator (&Segment separator)"}};for (auto p: unicodeControlChars){QAction* action = new QAction(p.first, insertUnicodeControlCharsMenu);action->setToolTip(p.second);// TODO: 把提示也显示出来connect(action, &QAction::triggered, ui->plainTextEdit, [=]{// TODO: 插入 Unicode 控制字符// ui->plainTextEdit->insertPlainText("\u202c");});insertUnicodeControlCharsMenu->addAction(action);}menu->addAction(ui->actionUndo_U);menu->addSeparator();menu->addAction(ui->actionCut_T);menu->addAction(ui->actionCopy_C);menu->addAction(ui->actionPaste_P);menu->addAction(ui->actionDelete_L);menu->addSeparator();menu->addAction(ui->actionSelect_All_A);menu->addSeparator();menu->addAction(ui->actionRead_Direction);menu->addAction(ui->actionShow_Unicode_Control_Chars);menu->addMenu(insertUnicodeControlCharsMenu);menu->addSeparator();menu->addAction(ui->actionRead_Mode);menu->addAction(ui->actionReselect_Chinese);menu->addSeparator();menu->addAction(ui->actionSearch_By_Bing);menu->exec(QCursor::pos());menu->deleteLater();
}void MainWindow::on_actionRead_Direction_triggered()
{auto direction = ui->actionRead_Direction->isChecked() ? Qt::RightToLeft : Qt::LeftToRight;ui->plainTextEdit->setLayoutDirection(direction);
}void MainWindow::on_actionRead_Mode_triggered()
{if (ui->plainTextEdit->isReadOnly()){ui->plainTextEdit->setReadOnly(false);ui->actionRead_Mode->setText(u8"关闭输入法(&L)");}else{ui->plainTextEdit->setReadOnly(true);ui->actionRead_Mode->setText(u8"打开输入法(&O)");}
}void MainWindow::on_actionShow_Unicode_Control_Chars_triggered()
{// TODO: 显示 Unicode 控制字符
}void MainWindow::on_actionReselect_Chinese_triggered()
{// TODO: 汉字重选
}void MainWindow::on_actionPrefrence_triggered()
{// TODO: 页面设置
}void MainWindow::on_actionPrint_triggered()
{// TODO: 打印
}

#include "finddialog.h"
#include "ui_finddialog.h"FindDialog::FindDialog(QSettings &settings, QWidget *parent) :QDialog(parent),ui(new Ui::FindDialog),settings(settings)
{ui->setupUi(this);//this->setWindowFlags(Qt::WindowContextHelpButtonHint);// 读取数据ui->findEdit->setText(settings.value("find/findText").toString());ui->replaceEdit->setText(settings.value("find/replaceText").toString());ui->caseSensitiveCheck->setChecked(settings.value("find/caseSensitive").toBool());ui->loopCheck->setChecked(settings.value("find/loop").toBool());if (!settings.value("find/down", true).toBool())ui->upRadio->setChecked(true);
}FindDialog::~FindDialog()
{delete ui;
}void FindDialog::openFind(bool replace)
{ui->label_3->setVisible(replace);ui->replaceEdit->setVisible(replace);ui->replaceButton->setVisible(replace);ui->replaceAllButton->setVisible(replace);ui->groupBox->setVisible(!replace);QDialog::show(); // open/exec会导致模态ui->findEdit->setFocus();ui->findEdit->selectAll();this->adjustSize();if (!replace)setWindowTitle(u8"查找");elsesetWindowTitle(u8"替换");
}const QString FindDialog::getFindText() const
{return ui->findEdit->text();
}const QString FindDialog::getReplaceText() const
{return ui->replaceEdit->text();
}bool FindDialog::isCaseSensitive() const
{return ui->caseSensitiveCheck->isChecked();
}bool FindDialog::isLoop() const
{return ui->loopCheck->isChecked();
}void FindDialog::on_findNextButton_clicked()
{if (ui->upRadio->isChecked())emit signalFindPrev();elseemit signalFindNext();settings.setValue("find/findText", ui->findEdit->text());
}void FindDialog::on_replaceButton_clicked()
{emit signalReplaceNext();settings.setValue("find/replaceText", ui->replaceEdit->text());
}void FindDialog::on_replaceAllButton_clicked()
{emit signalReplaceAll();settings.setValue("find/replaceText", ui->replaceEdit->text());
}void FindDialog::on_cancelButton_clicked()
{this->close();
}void FindDialog::on_caseSensitiveCheck_clicked()
{settings.setValue("find/caseSensitive", ui->caseSensitiveCheck->isChecked());
}void FindDialog::on_loopCheck_clicked()
{settings.setValue("find/loop", ui->loopCheck->isChecked());
}void FindDialog::on_upRadio_clicked()
{settings.setValue("find/down", false);
}void FindDialog::on_downRadio_clicked()
{settings.setValue("find/down", true);
}void FindDialog::showEvent(QShowEvent *event)
{emit signalShow();adjustSize();QWidget::showEvent(event);
}void FindDialog::hideEvent(QHideEvent *event)
{emit signalHide();QWidget::hideEvent(event);
}void FindDialog::on_findEdit_returnPressed()
{on_findNextButton_clicked();
}void FindDialog::on_replaceEdit_returnPressed()
{on_replaceButton_clicked();
}

三、下载连接

https://download.csdn.net/download/u013083044/89660580