qt6windows7/examples/widgets/richtext/syntaxhighlighter/mainwindow.cpp

// 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);
}