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50
51#include <QtWidgets>
52
53#include "mainwindow.h"
54
55//! [0]
56MainWindow::MainWindow(QWidget *parent)
57 : QMainWindow(parent)
58{
59 setupFileMenu();
60 setupHelpMenu();
61 setupEditor();
62
63 setCentralWidget(editor);
64 setWindowTitle(tr(s: "Syntax Highlighter"));
65}
66//! [0]
67
68void MainWindow::about()
69{
70 QMessageBox::about(parent: this, title: tr(s: "About Syntax Highlighter"),
71 text: tr(s: "<p>The <b>Syntax Highlighter</b> example shows how " \
72 "to perform simple syntax highlighting by subclassing " \
73 "the QSyntaxHighlighter class and describing " \
74 "highlighting rules using regular expressions.</p>"));
75}
76
77void MainWindow::newFile()
78{
79 editor->clear();
80}
81
82void MainWindow::openFile(const QString &path)
83{
84 QString fileName = path;
85
86 if (fileName.isNull())
87 fileName = QFileDialog::getOpenFileName(parent: this, caption: tr(s: "Open File"), dir: "", filter: "C++ Files (*.cpp *.h)");
88
89 if (!fileName.isEmpty()) {
90 QFile file(fileName);
91 if (file.open(flags: QFile::ReadOnly | QFile::Text))
92 editor->setPlainText(file.readAll());
93 }
94}
95
96//! [1]
97void MainWindow::setupEditor()
98{
99 QFont font;
100 font.setFamily("Courier");
101 font.setFixedPitch(true);
102 font.setPointSize(10);
103
104 editor = new QTextEdit;
105 editor->setFont(font);
106
107 highlighter = new Highlighter(editor->document());
108
109 QFile file("mainwindow.h");
110 if (file.open(flags: QFile::ReadOnly | QFile::Text))
111 editor->setPlainText(file.readAll());
112}
113//! [1]
114
115void MainWindow::setupFileMenu()
116{
117 QMenu *fileMenu = new QMenu(tr(s: "&File"), this);
118 menuBar()->addMenu(menu: fileMenu);
119
120 fileMenu->addAction(text: tr(s: "&New"), object: this,
121 slot: &MainWindow::newFile, shortcut: QKeySequence::New);
122 fileMenu->addAction(text: tr(s: "&Open..."),
123 object: this, slot: [this](){ openFile(); }, shortcut: QKeySequence::Open);
124 fileMenu->addAction(text: tr(s: "E&xit"), qApp,
125 slot: &QApplication::quit, shortcut: QKeySequence::Quit);
126}
127
128void MainWindow::setupHelpMenu()
129{
130 QMenu *helpMenu = new QMenu(tr(s: "&Help"), this);
131 menuBar()->addMenu(menu: helpMenu);
132
133 helpMenu->addAction(text: tr(s: "&About"), object: this, slot: &MainWindow::about);
134 helpMenu->addAction(text: tr(s: "About &Qt"), qApp, slot: &QApplication::aboutQt);
135}
136

source code of qtbase/examples/widgets/richtext/syntaxhighlighter/mainwindow.cpp