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++ // Copyright (C) 2016 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
++
++ #include <QtWidgets>
++
++ #include "mainwindow.h"
++
++ //! [0]
++ MainWindow::MainWindow(QWidget *parent)
++ : QMainWindow(parent)
++ {
++ setupFileMenu();
++ setupHelpMenu();
++ setupEditor();
++
++ setCentralWidget(editor);
++ setWindowTitle(tr("Syntax Highlighter"));
++ }
++ //! [0]
++
++ void MainWindow::about()
++ {
++ QMessageBox::about(this, tr("About Syntax Highlighter"),
++ tr("<p>The <b>Syntax Highlighter</b> example shows how " \
++ "to perform simple syntax highlighting by subclassing " \
++ "the QSyntaxHighlighter class and describing " \
++ "highlighting rules using regular expressions.</p>"));
++ }
++
++ void MainWindow::newFile()
++ {
++ editor->clear();
++ }
++
++ void MainWindow::openFile(const QString &path)
++ {
++ QString fileName = path;
++
++ if (fileName.isNull())
++ fileName = QFileDialog::getOpenFileName(this, tr("Open File"), "", "C++ Files (*.cpp *.h)");
++
++ if (!fileName.isEmpty()) {
++ QFile file(fileName);
++ if (file.open(QFile::ReadOnly | QFile::Text))
++ editor->setPlainText(file.readAll());
++ }
++ }
++
++ //! [1]
++ void MainWindow::setupEditor()
++ {
++ QFont font;
++ font.setFamily("Courier");
++ font.setFixedPitch(true);
++ font.setPointSize(10);
++
++ editor = new QTextEdit;
++ editor->setFont(font);
++
++ highlighter = new Highlighter(editor->document());
++
++ QFile file("mainwindow.h");
++ if (file.open(QFile::ReadOnly | QFile::Text))
++ editor->setPlainText(file.readAll());
++ }
++ //! [1]
++
++ void MainWindow::setupFileMenu()
++ {
++ QMenu *fileMenu = new QMenu(tr("&File"), this);
++ menuBar()->addMenu(fileMenu);
++
++ fileMenu->addAction(tr("&New"), QKeySequence::New,
++ this, &MainWindow::newFile);
++ fileMenu->addAction(tr("&Open..."), QKeySequence::Open,
++ this, [this](){ openFile(); });
++ fileMenu->addAction(tr("E&xit"), QKeySequence::Quit,
++ qApp, &QApplication::quit);
++ }
++
++ void MainWindow::setupHelpMenu()
++ {
++ QMenu *helpMenu = new QMenu(tr("&Help"), this);
++ menuBar()->addMenu(helpMenu);
++
++ helpMenu->addAction(tr("&About"), this, &MainWindow::about);
++ helpMenu->addAction(tr("About &Qt"), qApp, &QApplication::aboutQt);
++ }