mainwindow.cpp Example File

richtext/syntaxhighlighter/mainwindow.cpp
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#include <QtWidgets> #include "mainwindow.h" MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent) { setupFileMenu(); setupHelpMenu(); setupEditor(); setCentralWidget(editor); setWindowTitle(tr("Syntax Highlighter")); } 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()); } } 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()); } void MainWindow::setupFileMenu() { QMenu *fileMenu = new QMenu(tr("&File"), this); menuBar()->addMenu(fileMenu); fileMenu->addAction(tr("&New"), this, SLOT(newFile()), QKeySequence::New); fileMenu->addAction(tr("&Open..."), this, SLOT(openFile()), QKeySequence::Open); fileMenu->addAction(tr("E&xit"), qApp, SLOT(quit()), QKeySequence::Quit); } void MainWindow::setupHelpMenu() { QMenu *helpMenu = new QMenu(tr("&Help"), this); menuBar()->addMenu(helpMenu); helpMenu->addAction(tr("&About"), this, SLOT(about())); helpMenu->addAction(tr("About &Qt"), qApp, SLOT(aboutQt())); }