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Diffstat (limited to 'examples/widgets/tools/plugandpaint/mainwindow.cpp')
| -rw-r--r-- | examples/widgets/tools/plugandpaint/mainwindow.cpp | 309 |
1 files changed, 309 insertions, 0 deletions
diff --git a/examples/widgets/tools/plugandpaint/mainwindow.cpp b/examples/widgets/tools/plugandpaint/mainwindow.cpp new file mode 100644 index 0000000000..5626cdb82c --- /dev/null +++ b/examples/widgets/tools/plugandpaint/mainwindow.cpp @@ -0,0 +1,309 @@ +/**************************************************************************** +** +** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/legal +** +** This file is part of the examples of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:BSD$ +** You may use this file under the terms of the BSD license as follows: +** +** "Redistribution and use in source and binary forms, with or without +** modification, are permitted provided that the following conditions are +** met: +** * Redistributions of source code must retain the above copyright +** notice, this list of conditions and the following disclaimer. +** * Redistributions in binary form must reproduce the above copyright +** notice, this list of conditions and the following disclaimer in +** the documentation and/or other materials provided with the +** distribution. +** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names +** of its contributors may be used to endorse or promote products derived +** from this software without specific prior written permission. +** +** +** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + + +#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); +} + +//! [0] +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); +} +//! [0] + +//! [1] +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); +} +//! [1] + +//! [2] +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); +} +//! [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, 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); +} + +//! [4] +void MainWindow::loadPlugins() +{ + foreach (QObject *plugin, QPluginLoader::staticInstances()) + populateMenus(plugin); +//! [4] //! [5] + + 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"); +//! [5] + +//! [6] + foreach (QString fileName, pluginsDir.entryList(QDir::Files)) { + 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) +{ + 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())); +} +//! [10] + +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); + } + } +} |