1 /****************************************************************************

     2 **

     3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

     4 ** All rights reserved.

     5 ** Contact: Nokia Corporation (qt-info@nokia.com)

     6 **

     7 ** This file is part of the examples of the Qt Toolkit.

     8 **

     9 ** $QT_BEGIN_LICENSE:LGPL$

    10 ** No Commercial Usage

    11 ** This file contains pre-release code and may not be distributed.

    12 ** You may use this file in accordance with the terms and conditions

    13 ** contained in the Technology Preview License Agreement accompanying

    14 ** this package.

    15 **

    16 ** GNU Lesser General Public License Usage

    17 ** Alternatively, this file may be used under the terms of the GNU Lesser

    18 ** General Public License version 2.1 as published by the Free Software

    19 ** Foundation and appearing in the file LICENSE.LGPL included in the

    20 ** packaging of this file.  Please review the following information to

    21 ** ensure the GNU Lesser General Public License version 2.1 requirements

    22 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.

    23 **

    24 ** In addition, as a special exception, Nokia gives you certain additional

    25 ** rights.  These rights are described in the Nokia Qt LGPL Exception

    26 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

    27 **

    28 ** If you have questions regarding the use of this file, please contact

    29 ** Nokia at qt-info@nokia.com.

    30 **

    31 **

    32 **

    33 **

    34 **

    35 **

    36 **

    37 **

    38 ** $QT_END_LICENSE$

    39 **

    40 ****************************************************************************/

    41 

    42 

    43 #include "interfaces.h"

    44 #include "mainwindow.h"

    45 #include "paintarea.h"

    46 #include "plugindialog.h"

    47 

    48 #include <QPluginLoader>

    49 #include <QTimer>

    50 

    51 #include <QScrollArea>

    52 #include <QMessageBox>

    53 #include <QActionGroup>

    54 #include <QAction>

    55 #include <QMenu>

    56 #include <QMenuBar>

    57 #include <QFileDialog>

    58 #include <QColorDialog>

    59 #include <QInputDialog>

    60 #include <QApplication>

    61 

    62 MainWindow::MainWindow() :

    63     paintArea(new PaintArea),

    64     scrollArea(new QScrollArea)

    65 {

    66     scrollArea->setBackgroundRole(QPalette::Dark);

    67     scrollArea->setWidget(paintArea);

    68     setCentralWidget(scrollArea);

    69 

    70     createActions();

    71     createMenus();

    72     loadPlugins();

    73 

    74     setWindowTitle(tr("Plug & Paint"));

    75 

    76     if (!brushActionGroup->actions().isEmpty())

    77         brushActionGroup->actions().first()->trigger();

    78 

    79     QTimer::singleShot(500, this, SLOT(aboutPlugins()));

    80 }

    81 

    82 void MainWindow::open()

    83 {

    84     const QString fileName = QFileDialog::getOpenFileName(this,

    85                                                           tr("Open File"), 

    86                                                           QDir::currentPath());

    87     if (!fileName.isEmpty()) {

    88         if (!paintArea->openImage(fileName)) {

    89             QMessageBox::information(this, tr("Plug & Paint"),

    90                                      tr("Cannot load %1.").arg(fileName));

    91             return;

    92         }

    93         paintArea->adjustSize();

    94     }

    95 }

    96 

    97 bool MainWindow::saveAs()

    98 {

    99     const QString initialPath = QDir::currentPath() + "/untitled.png";

   100 

   101     const QString fileName = QFileDialog::getSaveFileName(this, tr("Save As"),

   102                                                           initialPath);

   103     if (fileName.isEmpty()) {

   104         return false;

   105     } else {

   106         return paintArea->saveImage(fileName, "png");

   107     }

   108 }

   109 

   110 void MainWindow::brushColor()

   111 {

   112     const QColor newColor = QColorDialog::getColor(paintArea->brushColor());

   113     if (newColor.isValid())

   114         paintArea->setBrushColor(newColor);

   115 }

   116 

   117 void MainWindow::brushWidth()

   118 {

   119     bool ok;

   120     const int newWidth = QInputDialog::getInteger(this, tr("Plug & Paint"),

   121                                                   tr("Select brush width:"),

   122                                                   paintArea->brushWidth(),

   123                                                   1, 50, 1, &ok);

   124     if (ok)

   125         paintArea->setBrushWidth(newWidth);

   126 }

   127 

   128 //! [0]

   129 void MainWindow::changeBrush()

   130 {

   131     QAction *action = qobject_cast<QAction *>(sender());

   132     BrushInterface *iBrush = qobject_cast<BrushInterface *>(action->parent());

   133     const QString brush = action->text();

   134 

   135     paintArea->setBrush(iBrush, brush);

   136 }

   137 //! [0]

   138 

   139 //! [1]

   140 void MainWindow::insertShape()

   141 {

   142     QAction *action = qobject_cast<QAction *>(sender());

   143     ShapeInterface *iShape = qobject_cast<ShapeInterface *>(action->parent());

   144 

   145     const QPainterPath path = iShape->generateShape(action->text(), this);

   146     if (!path.isEmpty())

   147         paintArea->insertShape(path);

   148 }

   149 //! [1]

   150 

   151 //! [2]

   152 void MainWindow::applyFilter()

   153 {

   154     QAction *action = qobject_cast<QAction *>(sender());

   155     FilterInterface *iFilter =

   156             qobject_cast<FilterInterface *>(action->parent());

   157 

   158     const QImage image = iFilter->filterImage(action->text(), paintArea->image(),

   159                                               this);

   160     paintArea->setImage(image);

   161 }

   162 //! [2]

   163 

   164 void MainWindow::about()

   165 {

   166    QMessageBox::about(this, tr("About Plug & Paint"),

   167             tr("The <b>Plug & Paint</b> example demonstrates how to write Qt "

   168                "applications that can be extended through plugins."));

   169 }

   170 

   171 //! [3]

   172 void MainWindow::aboutPlugins()

   173 {

   174     PluginDialog dialog(pluginsDir.path(), pluginFileNames, this);

   175     dialog.exec();

   176 }

   177 //! [3]

   178 

   179 void MainWindow::createActions()

   180 {

   181     openAct = new QAction(tr("&Open..."), this);

   182     openAct->setShortcuts(QKeySequence::Open);

   183     connect(openAct, SIGNAL(triggered()), this, SLOT(open()));

   184 

   185     saveAsAct = new QAction(tr("&Save As..."), this);

   186     saveAsAct->setShortcuts(QKeySequence::SaveAs);

   187     connect(saveAsAct, SIGNAL(triggered()), this, SLOT(saveAs()));

   188 

   189     exitAct = new QAction(tr("E&xit"), this);

   190     exitAct->setShortcuts(QKeySequence::Quit);

   191     connect(exitAct, SIGNAL(triggered()), this, SLOT(close()));

   192 

   193     brushColorAct = new QAction(tr("&Brush Color..."), this);

   194     connect(brushColorAct, SIGNAL(triggered()), this, SLOT(brushColor()));

   195 

   196     brushWidthAct = new QAction(tr("&Brush Width..."), this);

   197     connect(brushWidthAct, SIGNAL(triggered()), this, SLOT(brushWidth()));

   198 

   199     brushActionGroup = new QActionGroup(this);

   200 

   201     aboutAct = new QAction(tr("&About"), this);

   202     connect(aboutAct, SIGNAL(triggered()), this, SLOT(about()));

   203 

   204     aboutQtAct = new QAction(tr("About &Qt"), this);

   205     connect(aboutQtAct, SIGNAL(triggered()), qApp, SLOT(aboutQt()));

   206 

   207     aboutPluginsAct = new QAction(tr("About &Plugins"), this);

   208     connect(aboutPluginsAct, SIGNAL(triggered()), this, SLOT(aboutPlugins()));

   209 }

   210 

   211 void MainWindow::createMenus()

   212 {

   213     fileMenu = menuBar()->addMenu(tr("&File"));

   214     fileMenu->addAction(openAct);

   215     fileMenu->addAction(saveAsAct);

   216     fileMenu->addSeparator();

   217     fileMenu->addAction(exitAct);

   218 

   219     brushMenu = menuBar()->addMenu(tr("&Brush"));

   220     brushMenu->addAction(brushColorAct);

   221     brushMenu->addAction(brushWidthAct);

   222     brushMenu->addSeparator();

   223 

   224     shapesMenu = menuBar()->addMenu(tr("&Shapes"));

   225 

   226     filterMenu = menuBar()->addMenu(tr("&Filter"));

   227 

   228     menuBar()->addSeparator();

   229 

   230     helpMenu = menuBar()->addMenu(tr("&Help"));

   231     helpMenu->addAction(aboutAct);

   232     helpMenu->addAction(aboutQtAct);

   233     helpMenu->addAction(aboutPluginsAct);

   234 }

   235 

   236 //! [4]

   237 void MainWindow::loadPlugins()

   238 {

   239     foreach (QObject *plugin, QPluginLoader::staticInstances())

   240         populateMenus(plugin);

   241 //! [4] //! [5]

   242 

   243     pluginsDir = QDir(qApp->applicationDirPath());

   244 

   245 #if defined(Q_OS_WIN)

   246     if (pluginsDir.dirName().toLower() == "debug" || pluginsDir.dirName().toLower() == "release")

   247         pluginsDir.cdUp();

   248 #elif defined(Q_OS_MAC)

   249     if (pluginsDir.dirName() == "MacOS") {

   250         pluginsDir.cdUp();

   251         pluginsDir.cdUp();

   252         pluginsDir.cdUp();

   253     }

   254 #endif

   255     pluginsDir.cd("plugins");

   256 //! [5]

   257 

   258 //! [6]

   259     foreach (QString fileName, pluginsDir.entryList(QDir::Files)) {

   260         QPluginLoader loader(pluginsDir.absoluteFilePath(fileName));

   261         QObject *plugin = loader.instance();

   262         if (plugin) {

   263             populateMenus(plugin);

   264             pluginFileNames += fileName;

   265 //! [6] //! [7]

   266         }

   267 //! [7] //! [8]

   268     }

   269 //! [8]

   270 

   271 //! [9]

   272     brushMenu->setEnabled(!brushActionGroup->actions().isEmpty());

   273     shapesMenu->setEnabled(!shapesMenu->actions().isEmpty());

   274     filterMenu->setEnabled(!filterMenu->actions().isEmpty());

   275 }

   276 //! [9]

   277 

   278 //! [10]

   279 void MainWindow::populateMenus(QObject *plugin)

   280 {

   281     BrushInterface *iBrush = qobject_cast<BrushInterface *>(plugin);

   282     if (iBrush)

   283         addToMenu(plugin, iBrush->brushes(), brushMenu, SLOT(changeBrush()),

   284                   brushActionGroup);

   285 

   286     ShapeInterface *iShape = qobject_cast<ShapeInterface *>(plugin);

   287     if (iShape)

   288         addToMenu(plugin, iShape->shapes(), shapesMenu, SLOT(insertShape()));

   289 

   290     FilterInterface *iFilter = qobject_cast<FilterInterface *>(plugin);

   291     if (iFilter)

   292         addToMenu(plugin, iFilter->filters(), filterMenu, SLOT(applyFilter()));

   293 }

   294 //! [10]

   295 

   296 void MainWindow::addToMenu(QObject *plugin, const QStringList &texts,

   297                            QMenu *menu, const char *member,

   298                            QActionGroup *actionGroup)

   299 {

   300     foreach (QString text, texts) {

   301         QAction *action = new QAction(text, plugin);

   302         connect(action, SIGNAL(triggered()), this, member);

   303         menu->addAction(action);

   304 

   305         if (actionGroup) {

   306             action->setCheckable(true);

   307             actionGroup->addAction(action);

   308         }

   309     }

   310 }