Long live Qt!

1 files changed, 310 insertions, 0 deletions

diff --git a/examples/tools/plugandpaint/mainwindow.cpp b/examples/tools/plugandpaint/mainwindow.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+
+#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::getInteger(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->setShortcut(tr("Ctrl+O"));
+    connect(openAct, SIGNAL(triggered()), this, SLOT(open()));
+
+    saveAsAct = new QAction(tr("&Save As..."), this);
+    saveAsAct->setShortcut(tr("Ctrl+S"));
+    connect(saveAsAct, SIGNAL(triggered()), this, SLOT(saveAs()));
+
+    exitAct = new QAction(tr("E&xit"), this);
+    exitAct->setShortcut(tr("Ctrl+Q"));
+    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);
+        }
+    }
+}