mainwindow.cpp Example File

webenginewidgets/markdowneditor/mainwindow.cpp
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#include "mainwindow.h" #include "previewpage.h" #include "ui_mainwindow.h" #include <QFile> #include <QFileDialog> #include <QFontDatabase> #include <QMessageBox> #include <QTextStream> #include <QWebChannel> MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) { ui->setupUi(this); ui->editor->setFont(QFontDatabase::systemFont(QFontDatabase::FixedFont)); ui->preview->setContextMenuPolicy(Qt::NoContextMenu); PreviewPage *page = new PreviewPage(this); ui->preview->setPage(page); connect(ui->editor, &QPlainTextEdit::textChanged, [this]() { m_content.setText(ui->editor->toPlainText()); }); QWebChannel *channel = new QWebChannel(this); channel->registerObject(QStringLiteral("content"), &m_content); page->setWebChannel(channel); ui->preview->setUrl(QUrl("qrc:/index.html")); connect(ui->actionNew, &QAction::triggered, this, &MainWindow::onFileNew); connect(ui->actionOpen, &QAction::triggered, this, &MainWindow::onFileOpen); connect(ui->actionSave, &QAction::triggered, this, &MainWindow::onFileSave); connect(ui->actionSaveAs, &QAction::triggered, this, &MainWindow::onFileSaveAs); connect(ui->actionExit, &QAction::triggered, this, &MainWindow::onExit); connect(ui->editor->document(), &QTextDocument::modificationChanged, ui->actionSave, &QAction::setEnabled); QFile defaultTextFile(":/default.md"); defaultTextFile.open(QIODevice::ReadOnly); ui->editor->setPlainText(defaultTextFile.readAll()); } MainWindow::~MainWindow() { delete ui; } void MainWindow::openFile(const QString &path) { QFile f(path); if (!f.open(QIODevice::ReadOnly)) { QMessageBox::warning(this, windowTitle(), tr("Could not open file %1: %2").arg( QDir::toNativeSeparators(path), f.errorString())); return; } m_filePath = path; ui->editor->setPlainText(f.readAll()); } bool MainWindow::isModified() const { return ui->editor->document()->isModified(); } void MainWindow::onFileNew() { if (isModified()) { QMessageBox::StandardButton button = QMessageBox::question(this, windowTitle(), tr("You have unsaved changes. Do you want to create a new document anyway?")); if (button != QMessageBox::Yes) return; } m_filePath.clear(); ui->editor->setPlainText(tr("## New document")); ui->editor->document()->setModified(false); } void MainWindow::onFileOpen() { if (isModified()) { QMessageBox::StandardButton button = QMessageBox::question(this, windowTitle(), tr("You have unsaved changes. Do you want to open a new document anyway?")); if (button != QMessageBox::Yes) return; } QString path = QFileDialog::getOpenFileName(this, tr("Open MarkDown File"), "", tr("MarkDown File (*.md)")); if (path.isEmpty()) return; openFile(path); } void MainWindow::onFileSave() { if (m_filePath.isEmpty()) { onFileSaveAs(); return; } QFile f(m_filePath); if (!f.open(QIODevice::WriteOnly | QIODevice::Text)) { QMessageBox::warning(this, windowTitle(), tr("Could not write to file %1: %2").arg( QDir::toNativeSeparators(m_filePath), f.errorString())); return; } QTextStream str(&f); str << ui->editor->toPlainText(); ui->editor->document()->setModified(false); } void MainWindow::onFileSaveAs() { QString path = QFileDialog::getSaveFileName(this, tr("Save MarkDown File"), "", tr("MarkDown File (*.md, *.markdown)")); if (path.isEmpty()) return; m_filePath = path; onFileSave(); } void MainWindow::onExit() { if (isModified()) { QMessageBox::StandardButton button = QMessageBox::question(this, windowTitle(), tr("You have unsaved changes. Do you want to exit anyway?")); if (button != QMessageBox::Yes) return; } close(); }