mainwindow.cpp Example File

svgviewer/mainwindow.cpp
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#include "mainwindow.h" #include "exportdialog.h" #include <QtWidgets> #include <QSvgRenderer> #include "svgview.h" static inline QString picturesLocation() { return QStandardPaths::standardLocations(QStandardPaths::PicturesLocation).value(0, QDir::currentPath()); } MainWindow::MainWindow() : QMainWindow() , m_view(new SvgView) { QToolBar *toolBar = new QToolBar(this); addToolBar(Qt::TopToolBarArea, toolBar); QMenu *fileMenu = menuBar()->addMenu(tr("&File")); const QIcon openIcon = QIcon::fromTheme("document-open", QIcon(":/qt-project.org/styles/commonstyle/images/standardbutton-open-32.png")); QAction *openAction = fileMenu->addAction(openIcon, tr("&Open..."), this, &MainWindow::openFile); openAction->setShortcut(QKeySequence::Open); toolBar->addAction(openAction); const QIcon exportIcon = QIcon::fromTheme("document-save", QIcon(":/qt-project.org/styles/commonstyle/images/standardbutton-save-32.png")); QAction *exportAction = fileMenu->addAction(exportIcon, tr("&Export..."), this, &MainWindow::exportImage); exportAction->setToolTip(tr("Export Image")); exportAction->setShortcut(Qt::CTRL + Qt::Key_E); toolBar->addAction(exportAction); QAction *quitAction = fileMenu->addAction(tr("E&xit"), qApp, QCoreApplication::quit); quitAction->setShortcuts(QKeySequence::Quit); QMenu *viewMenu = menuBar()->addMenu(tr("&View")); m_backgroundAction = viewMenu->addAction(tr("&Background")); m_backgroundAction->setEnabled(false); m_backgroundAction->setCheckable(true); m_backgroundAction->setChecked(false); connect(m_backgroundAction, &QAction::toggled, m_view, &SvgView::setViewBackground); m_outlineAction = viewMenu->addAction(tr("&Outline")); m_outlineAction->setEnabled(false); m_outlineAction->setCheckable(true); m_outlineAction->setChecked(true); connect(m_outlineAction, &QAction::toggled, m_view, &SvgView::setViewOutline); QMenu *rendererMenu = menuBar()->addMenu(tr("&Renderer")); m_nativeAction = rendererMenu->addAction(tr("&Native")); m_nativeAction->setCheckable(true); m_nativeAction->setChecked(true); m_nativeAction->setData(int(SvgView::Native)); #ifndef QT_NO_OPENGL m_glAction = rendererMenu->addAction(tr("&OpenGL")); m_glAction->setCheckable(true); m_glAction->setData(int(SvgView::OpenGL)); #endif m_imageAction = rendererMenu->addAction(tr("&Image")); m_imageAction->setCheckable(true); m_imageAction->setData(int(SvgView::Image)); rendererMenu->addSeparator(); m_highQualityAntialiasingAction = rendererMenu->addAction(tr("&High Quality Antialiasing")); m_highQualityAntialiasingAction->setEnabled(false); m_highQualityAntialiasingAction->setCheckable(true); m_highQualityAntialiasingAction->setChecked(false); connect(m_highQualityAntialiasingAction, &QAction::toggled, m_view, &SvgView::setHighQualityAntialiasing); #ifdef QT_NO_OPENGL m_highQualityAntialiasingAction->setVisible(false); #endif QActionGroup *rendererGroup = new QActionGroup(this); rendererGroup->addAction(m_nativeAction); #ifndef QT_NO_OPENGL rendererGroup->addAction(m_glAction); #endif rendererGroup->addAction(m_imageAction); menuBar()->addMenu(rendererMenu); connect(rendererGroup, &QActionGroup::triggered, [this] (QAction *a) { setRenderer(a->data().toInt()); }); QMenu *help = menuBar()->addMenu(tr("&Help")); help->addAction(tr("About Qt"), qApp, &QApplication::aboutQt); setCentralWidget(m_view); } void MainWindow::openFile() { QFileDialog fileDialog(this); fileDialog.setAcceptMode(QFileDialog::AcceptOpen); fileDialog.setMimeTypeFilters(QStringList() << "image/svg+xml" << "image/svg+xml-compressed"); fileDialog.setWindowTitle(tr("Open SVG File")); if (m_currentPath.isEmpty()) fileDialog.setDirectory(picturesLocation()); while (fileDialog.exec() == QDialog::Accepted && !loadFile(fileDialog.selectedFiles().constFirst())) ; } bool MainWindow::loadFile(const QString &fileName) { if (!QFileInfo::exists(fileName) || !m_view->openFile(fileName)) { QMessageBox::critical(this, tr("Open SVG File"), tr("Could not open file '%1'.").arg(QDir::toNativeSeparators(fileName))); return false; } if (!fileName.startsWith(":/")) { m_currentPath = fileName; setWindowFilePath(fileName); const QSize size = m_view->svgSize(); const QString message = tr("Opened %1, %2x%3").arg(QFileInfo(fileName).fileName()).arg(size.width()).arg(size.width()); statusBar()->showMessage(message); } m_outlineAction->setEnabled(true); m_backgroundAction->setEnabled(true); const QSize availableSize = QApplication::desktop()->availableGeometry(this).size(); resize(m_view->sizeHint().expandedTo(availableSize / 4) + QSize(80, 80 + menuBar()->height())); return true; } void MainWindow::setRenderer(int renderMode) { m_highQualityAntialiasingAction->setEnabled(renderMode == SvgView::OpenGL); m_view->setRenderer(static_cast<SvgView::RendererType>(renderMode)); } void MainWindow::exportImage() { ExportDialog exportDialog(this); exportDialog.setExportSize(m_view->svgSize()); QString fileName; if (m_currentPath.isEmpty()) { fileName = picturesLocation() + QLatin1String("/export.png"); } else { const QFileInfo fi(m_currentPath); fileName = fi.absolutePath() + QLatin1Char('/') + fi.baseName() + QLatin1String(".png"); } exportDialog.setExportFileName(fileName); while (true) { if (exportDialog.exec() != QDialog::Accepted) break; const QSize imageSize = exportDialog.exportSize(); QImage image(imageSize, QImage::Format_ARGB32); image.fill(Qt::transparent); QPainter painter; painter.begin(&image); m_view->renderer()->render(&painter, QRectF(QPointF(), QSizeF(imageSize))); painter.end(); const QString fileName = exportDialog.exportFileName(); if (image.save(fileName)) { const QString message = tr("Exported %1, %2x%3, %4 bytes") .arg(QDir::toNativeSeparators(fileName)).arg(imageSize.width()).arg(imageSize.height()) .arg(QFileInfo(fileName).size()); statusBar()->showMessage(message); break; } else { QMessageBox::critical(this, tr("Export Image"), tr("Could not write file '%1'.").arg(QDir::toNativeSeparators(fileName))); } } }

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