| /**************************************************************************** |
| ** |
| ** Copyright (C) 2016 The Qt Company Ltd. |
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| ** This file is part of the examples of the Qt Toolkit. |
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| |
| |
| #include "mainwindow.h" |
| #include "interfaces.h" |
| #include "paintarea.h" |
| #include "plugindialog.h" |
| |
| #include <QAction> |
| #include <QActionGroup> |
| #include <QApplication> |
| #include <QColorDialog> |
| #include <QFileDialog> |
| #include <QInputDialog> |
| #include <QMenu> |
| #include <QMenuBar> |
| #include <QMessageBox> |
| #include <QPluginLoader> |
| #include <QScrollArea> |
| #include <QTimer> |
| |
| 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, &MainWindow::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; |
| |
| 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); |
| } |
| |
| //! [0] |
| void MainWindow::changeBrush() |
| { |
| auto action = qobject_cast<QAction *>(sender()); |
| if (!action) |
| return; |
| auto iBrush = qobject_cast<BrushInterface *>(action->parent()); |
| if (!iBrush) |
| return; |
| const QString brush = action->text(); |
| |
| paintArea->setBrush(iBrush, brush); |
| } |
| //! [0] |
| |
| //! [1] |
| void MainWindow::insertShape() |
| { |
| auto action = qobject_cast<QAction *>(sender()); |
| if (!action) |
| return; |
| auto iShape = qobject_cast<ShapeInterface *>(action->parent()); |
| if (!iShape) |
| return; |
| |
| const QPainterPath path = iShape->generateShape(action->text(), this); |
| if (!path.isEmpty()) |
| paintArea->insertShape(path); |
| } |
| //! [1] |
| |
| //! [2] |
| void MainWindow::applyFilter() |
| { |
| auto action = qobject_cast<QAction *>(sender()); |
| if (!action) |
| return; |
| auto iFilter = qobject_cast<FilterInterface *>(action->parent()); |
| if (!iFilter) |
| return; |
| |
| const QImage image = iFilter->filterImage(action->text(), paintArea->image(), |
| this); |
| paintArea->setImage(image); |
| } |
| //! [2] |
| |
| 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.")); |
| } |
| |
| //! [3] |
| void MainWindow::aboutPlugins() |
| { |
| PluginDialog dialog(pluginsDir.path(), pluginFileNames, this); |
| dialog.exec(); |
| } |
| //! [3] |
| |
| void MainWindow::createActions() |
| { |
| openAct = new QAction(tr("&Open..."), this); |
| openAct->setShortcuts(QKeySequence::Open); |
| connect(openAct, &QAction::triggered, this, &MainWindow::open); |
| |
| saveAsAct = new QAction(tr("&Save As..."), this); |
| saveAsAct->setShortcuts(QKeySequence::SaveAs); |
| connect(saveAsAct, &QAction::triggered, this, &MainWindow::saveAs); |
| |
| exitAct = new QAction(tr("E&xit"), this); |
| exitAct->setShortcuts(QKeySequence::Quit); |
| connect(exitAct, &QAction::triggered, this, &MainWindow::close); |
| |
| brushColorAct = new QAction(tr("&Brush Color..."), this); |
| connect(brushColorAct, &QAction::triggered, this, &MainWindow::brushColor); |
| |
| brushWidthAct = new QAction(tr("&Brush Width..."), this); |
| connect(brushWidthAct, &QAction::triggered, this, &MainWindow::brushWidth); |
| |
| brushActionGroup = new QActionGroup(this); |
| |
| aboutAct = new QAction(tr("&About"), this); |
| connect(aboutAct, &QAction::triggered, this, &MainWindow::about); |
| |
| aboutQtAct = new QAction(tr("About &Qt"), this); |
| connect(aboutQtAct, &QAction::triggered, qApp, &QApplication::aboutQt); |
| |
| aboutPluginsAct = new QAction(tr("About &Plugins"), this); |
| connect(aboutPluginsAct, &QAction::triggered, this, &MainWindow::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); |
| } |
| |
| //! [4] |
| void MainWindow::loadPlugins() |
| { |
| const auto staticInstances = QPluginLoader::staticInstances(); |
| for (QObject *plugin : staticInstances) |
| populateMenus(plugin); |
| //! [4] //! [5] |
| |
| pluginsDir = QDir(QCoreApplication::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"); |
| //! [5] |
| |
| //! [6] |
| const auto entryList = pluginsDir.entryList(QDir::Files); |
| for (const QString &fileName : entryList) { |
| QPluginLoader loader(pluginsDir.absoluteFilePath(fileName)); |
| QObject *plugin = loader.instance(); |
| if (plugin) { |
| populateMenus(plugin); |
| pluginFileNames += fileName; |
| //! [6] //! [7] |
| } |
| //! [7] //! [8] |
| } |
| //! [8] |
| |
| //! [9] |
| brushMenu->setEnabled(!brushActionGroup->actions().isEmpty()); |
| shapesMenu->setEnabled(!shapesMenu->actions().isEmpty()); |
| filterMenu->setEnabled(!filterMenu->actions().isEmpty()); |
| } |
| //! [9] |
| |
| //! [10] |
| void MainWindow::populateMenus(QObject *plugin) |
| { |
| auto iBrush = qobject_cast<BrushInterface *>(plugin); |
| if (iBrush) |
| addToMenu(plugin, iBrush->brushes(), brushMenu, &MainWindow::changeBrush, |
| brushActionGroup); |
| |
| auto iShape = qobject_cast<ShapeInterface *>(plugin); |
| if (iShape) |
| addToMenu(plugin, iShape->shapes(), shapesMenu, &MainWindow::insertShape); |
| |
| auto iFilter = qobject_cast<FilterInterface *>(plugin); |
| if (iFilter) |
| addToMenu(plugin, iFilter->filters(), filterMenu, &MainWindow::applyFilter); |
| } |
| //! [10] |
| |
| void MainWindow::addToMenu(QObject *plugin, const QStringList &texts, |
| QMenu *menu, Member member, |
| QActionGroup *actionGroup) |
| { |
| for (const QString &text : texts) { |
| auto action = new QAction(text, plugin); |
| connect(action, &QAction::triggered, this, member); |
| menu->addAction(action); |
| |
| if (actionGroup) { |
| action->setCheckable(true); |
| actionGroup->addAction(action); |
| } |
| } |
| } |