mainwindow.cpp Example File

tools/plugandpaint/app/mainwindow.cpp
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#include "interfaces.h" #include "mainwindow.h" #include "paintarea.h" #include "plugindialog.h" #include <QPluginLoader> #include <QTimer> #include <QScrollArea> #include <QMessageBox> #include <QActionGroup> #include <QAction> #include <QMenu> #include <QMenuBar> #include <QFileDialog> #include <QColorDialog> #include <QInputDialog> #include <QApplication> MainWindow::MainWindow() : paintArea(new PaintArea), scrollArea(new QScrollArea) { scrollArea->setBackgroundRole(QPalette::Dark); scrollArea->setWidget(paintArea); setCentralWidget(scrollArea); createActions(); createMenus(); loadPlugins(); setWindowTitle(tr("Plug & Paint")); if (!brushActionGroup->actions().isEmpty()) brushActionGroup->actions().first()->trigger(); QTimer::singleShot(500, this, SLOT(aboutPlugins())); } void MainWindow::open() { const QString fileName = QFileDialog::getOpenFileName(this, tr("Open File"), QDir::currentPath()); if (!fileName.isEmpty()) { if (!paintArea->openImage(fileName)) { QMessageBox::information(this, tr("Plug & Paint"), tr("Cannot load %1.").arg(fileName)); return; } paintArea->adjustSize(); } } bool MainWindow::saveAs() { const QString initialPath = QDir::currentPath() + "/untitled.png"; const QString fileName = QFileDialog::getSaveFileName(this, tr("Save As"), initialPath); if (fileName.isEmpty()) { return false; } else { return paintArea->saveImage(fileName, "png"); } } void MainWindow::brushColor() { const QColor newColor = QColorDialog::getColor(paintArea->brushColor()); if (newColor.isValid()) paintArea->setBrushColor(newColor); } void MainWindow::brushWidth() { bool ok; const int newWidth = QInputDialog::getInt(this, tr("Plug & Paint"), tr("Select brush width:"), paintArea->brushWidth(), 1, 50, 1, &ok); if (ok) paintArea->setBrushWidth(newWidth); } void MainWindow::changeBrush() { QAction *action = qobject_cast<QAction *>(sender()); BrushInterface *iBrush = qobject_cast<BrushInterface *>(action->parent()); const QString brush = action->text(); paintArea->setBrush(iBrush, brush); } void MainWindow::insertShape() { QAction *action = qobject_cast<QAction *>(sender()); ShapeInterface *iShape = qobject_cast<ShapeInterface *>(action->parent()); const QPainterPath path = iShape->generateShape(action->text(), this); if (!path.isEmpty()) paintArea->insertShape(path); } void MainWindow::applyFilter() { QAction *action = qobject_cast<QAction *>(sender()); FilterInterface *iFilter = qobject_cast<FilterInterface *>(action->parent()); const QImage image = iFilter->filterImage(action->text(), paintArea->image(), this); paintArea->setImage(image); } void MainWindow::about() { QMessageBox::about(this, tr("About Plug & Paint"), tr("The <b>Plug & Paint</b> example demonstrates how to write Qt " "applications that can be extended through plugins.")); } void MainWindow::aboutPlugins() { PluginDialog dialog(pluginsDir.path(), pluginFileNames, this); dialog.exec(); } void MainWindow::createActions() { openAct = new QAction(tr("&Open..."), this); openAct->setShortcuts(QKeySequence::Open); connect(openAct, SIGNAL(triggered()), this, SLOT(open())); saveAsAct = new QAction(tr("&Save As..."), this); saveAsAct->setShortcuts(QKeySequence::SaveAs); connect(saveAsAct, SIGNAL(triggered()), this, SLOT(saveAs())); exitAct = new QAction(tr("E&xit"), this); exitAct->setShortcuts(QKeySequence::Quit); connect(exitAct, SIGNAL(triggered()), this, SLOT(close())); brushColorAct = new QAction(tr("&Brush Color..."), this); connect(brushColorAct, SIGNAL(triggered()), this, SLOT(brushColor())); brushWidthAct = new QAction(tr("&Brush Width..."), this); connect(brushWidthAct, SIGNAL(triggered()), this, SLOT(brushWidth())); brushActionGroup = new QActionGroup(this); aboutAct = new QAction(tr("&About"), this); connect(aboutAct, SIGNAL(triggered()), this, SLOT(about())); aboutQtAct = new QAction(tr("About &Qt"), this); connect(aboutQtAct, SIGNAL(triggered()), qApp, SLOT(aboutQt())); aboutPluginsAct = new QAction(tr("About &Plugins"), this); connect(aboutPluginsAct, SIGNAL(triggered()), this, SLOT(aboutPlugins())); } void MainWindow::createMenus() { fileMenu = menuBar()->addMenu(tr("&File")); fileMenu->addAction(openAct); fileMenu->addAction(saveAsAct); fileMenu->addSeparator(); fileMenu->addAction(exitAct); brushMenu = menuBar()->addMenu(tr("&Brush")); brushMenu->addAction(brushColorAct); brushMenu->addAction(brushWidthAct); brushMenu->addSeparator(); shapesMenu = menuBar()->addMenu(tr("&Shapes")); filterMenu = menuBar()->addMenu(tr("&Filter")); menuBar()->addSeparator(); helpMenu = menuBar()->addMenu(tr("&Help")); helpMenu->addAction(aboutAct); helpMenu->addAction(aboutQtAct); helpMenu->addAction(aboutPluginsAct); } void MainWindow::loadPlugins() { foreach (QObject *plugin, QPluginLoader::staticInstances()) populateMenus(plugin); pluginsDir = QDir(qApp->applicationDirPath()); #if defined(Q_OS_WIN) if (pluginsDir.dirName().toLower() == "debug" || pluginsDir.dirName().toLower() == "release") pluginsDir.cdUp(); #elif defined(Q_OS_MAC) if (pluginsDir.dirName() == "MacOS") { pluginsDir.cdUp(); pluginsDir.cdUp(); pluginsDir.cdUp(); } #endif pluginsDir.cd("plugins"); foreach (QString fileName, pluginsDir.entryList(QDir::Files)) { QPluginLoader loader(pluginsDir.absoluteFilePath(fileName)); QObject *plugin = loader.instance(); if (plugin) { populateMenus(plugin); pluginFileNames += fileName; } } brushMenu->setEnabled(!brushActionGroup->actions().isEmpty()); shapesMenu->setEnabled(!shapesMenu->actions().isEmpty()); filterMenu->setEnabled(!filterMenu->actions().isEmpty()); } void MainWindow::populateMenus(QObject *plugin) { BrushInterface *iBrush = qobject_cast<BrushInterface *>(plugin); if (iBrush) addToMenu(plugin, iBrush->brushes(), brushMenu, SLOT(changeBrush()), brushActionGroup); ShapeInterface *iShape = qobject_cast<ShapeInterface *>(plugin); if (iShape) addToMenu(plugin, iShape->shapes(), shapesMenu, SLOT(insertShape())); FilterInterface *iFilter = qobject_cast<FilterInterface *>(plugin); if (iFilter) addToMenu(plugin, iFilter->filters(), filterMenu, SLOT(applyFilter())); } void MainWindow::addToMenu(QObject *plugin, const QStringList &texts, QMenu *menu, const char *member, QActionGroup *actionGroup) { foreach (QString text, texts) { QAction *action = new QAction(text, plugin); connect(action, SIGNAL(triggered()), this, member); menu->addAction(action); if (actionGroup) { action->setCheckable(true); actionGroup->addAction(action); } } }