source: tspsg/src/mainwindow.cpp @ 7cd6da5021

/*
 *  TSPSG: TSP Solver and Generator
 *  Copyright (C) 2007-2010 Lёppa <contacts[at]oleksii[dot]name>
 *
 *  $Id$
 *  $URL$
 *
 *  This file is part of TSPSG.
 *
 *  TSPSG is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  TSPSG is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with TSPSG.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "mainwindow.h"

#ifdef Q_OS_WIN32
        #include "shobjidl.h"
#endif

#ifdef _T_T_L_
#include "_.h"
_C_ _R_ _Y_ _P_ _T_
#endif

/*!
 * \brief Class constructor.
 * \param parent Main Window parent widget.
 *
 *  Initializes Main Window and creates its layout based on target OS.
 *  Loads TSPSG settings and opens a task file if it was specified as a commandline parameter.
 */
MainWindow::MainWindow(QWidget *parent)
        : QMainWindow(parent)
{
        settings = new QSettings(QSettings::IniFormat, QSettings::UserScope, "TSPSG", "tspsg", this);

        if (settings->contains("Style")) {
QStyle *s = QStyleFactory::create(settings->value("Style").toString());
                if (s != NULL)
                        QApplication::setStyle(s);
                else
                        settings->remove("Style");
        }

        loadLanguage();
        setupUi();
        setAcceptDrops(true);

        initDocStyleSheet();

#ifndef QT_NO_PRINTER
        printer = new QPrinter(QPrinter::HighResolution);
#endif // QT_NO_PRINTER

#ifdef Q_OS_WINCE_WM
        currentGeometry = QApplication::desktop()->availableGeometry(0);
        // We need to react to SIP show/hide and resize the window appropriately
        connect(QApplication::desktop(), SIGNAL(workAreaResized(int)), SLOT(desktopResized(int)));
#endif // Q_OS_WINCE_WM
        connect(actionFileNew, SIGNAL(triggered()), SLOT(actionFileNewTriggered()));
        connect(actionFileOpen, SIGNAL(triggered()), SLOT(actionFileOpenTriggered()));
        connect(actionFileSave, SIGNAL(triggered()), SLOT(actionFileSaveTriggered()));
        connect(actionFileSaveAsTask, SIGNAL(triggered()), SLOT(actionFileSaveAsTaskTriggered()));
        connect(actionFileSaveAsSolution, SIGNAL(triggered()), SLOT(actionFileSaveAsSolutionTriggered()));
#ifndef QT_NO_PRINTER
        connect(actionFilePrintPreview, SIGNAL(triggered()), SLOT(actionFilePrintPreviewTriggered()));
        connect(actionFilePrint, SIGNAL(triggered()), SLOT(actionFilePrintTriggered()));
#endif // QT_NO_PRINTER
#ifndef HANDHELD
        connect(actionSettingsToolbarsConfigure, SIGNAL(triggered()), SLOT(actionSettingsToolbarsConfigureTriggered()));
#endif // HANDHELD
        connect(actionSettingsPreferences, SIGNAL(triggered()), SLOT(actionSettingsPreferencesTriggered()));
#ifdef Q_OS_WIN32
        connect(actionHelpCheck4Updates, SIGNAL(triggered()), SLOT(actionHelpCheck4UpdatesTriggered()));
#endif // Q_OS_WIN32
        connect(actionSettingsLanguageAutodetect, SIGNAL(triggered(bool)), SLOT(actionSettingsLanguageAutodetectTriggered(bool)));
        connect(groupSettingsLanguageList, SIGNAL(triggered(QAction *)), SLOT(groupSettingsLanguageListTriggered(QAction *)));
        connect(actionSettingsStyleSystem, SIGNAL(triggered(bool)), SLOT(actionSettingsStyleSystemTriggered(bool)));
        connect(groupSettingsStyleList, SIGNAL(triggered(QAction*)), SLOT(groupSettingsStyleListTriggered(QAction*)));
        connect(actionHelpAboutQt, SIGNAL(triggered()), qApp, SLOT(aboutQt()));
        connect(actionHelpAbout, SIGNAL(triggered()), SLOT(actionHelpAboutTriggered()));

        connect(buttonSolve, SIGNAL(clicked()), SLOT(buttonSolveClicked()));
        connect(buttonRandom, SIGNAL(clicked()), SLOT(buttonRandomClicked()));
        connect(buttonBackToTask, SIGNAL(clicked()), SLOT(buttonBackToTaskClicked()));
        connect(spinCities, SIGNAL(valueChanged(int)), SLOT(spinCitiesValueChanged(int)));

#ifndef HANDHELD
        // Centering main window
QRect rect = geometry();
        rect.moveCenter(QApplication::desktop()->availableGeometry(this).center());
        setGeometry(rect);
        if (settings->value("SavePos", DEF_SAVEPOS).toBool()) {
                // Loading of saved window state
                settings->beginGroup("MainWindow");
                restoreGeometry(settings->value("Geometry").toByteArray());
                restoreState(settings->value("State").toByteArray());
                settings->endGroup();
        }
#endif // HANDHELD

        tspmodel = new CTSPModel(this);
        taskView->setModel(tspmodel);
        connect(tspmodel, SIGNAL(numCitiesChanged(int)), SLOT(numCitiesChanged(int)));
        connect(tspmodel, SIGNAL(dataChanged(const QModelIndex &, const QModelIndex &)), SLOT(dataChanged(const QModelIndex &, const QModelIndex &)));
        connect(tspmodel, SIGNAL(layoutChanged()), SLOT(dataChanged()));
        if ((QCoreApplication::arguments().count() > 1) && (tspmodel->loadTask(QCoreApplication::arguments().at(1))))
                setFileName(QCoreApplication::arguments().at(1));
        else {
                setFileName();
                spinCities->setValue(settings->value("NumCities",DEF_NUM_CITIES).toInt());
                spinCitiesValueChanged(spinCities->value());
        }
        setWindowModified(false);
}

MainWindow::~MainWindow()
{
#ifndef QT_NO_PRINTER
        delete printer;
#endif
}

/* Privates **********************************************************/

void MainWindow::actionFileNewTriggered()
{
        if (!maybeSave())
                return;
        QApplication::setOverrideCursor(QCursor(Qt::WaitCursor));
        tspmodel->clear();
        setFileName();
        setWindowModified(false);
        tabWidget->setCurrentIndex(0);
        solutionText->clear();
        toggleSolutionActions(false);
        QApplication::restoreOverrideCursor();
}

void MainWindow::actionFileOpenTriggered()
{
        if (!maybeSave())
                return;

QStringList filters(tr("All Supported Formats") + " (*.tspt *.zkt)");
        filters.append(tr("%1 Task Files").arg("TSPSG") + " (*.tspt)");
        filters.append(tr("%1 Task Files").arg("ZKomModRd") + " (*.zkt)");
        filters.append(tr("All Files") + " (*)");

QString file;
        if ((fileName == tr("Untitled") + ".tspt") && settings->value("SaveLastUsed", DEF_SAVE_LAST_USED).toBool())
                file = settings->value("LastUsed/TaskLoadPath").toString();
        else
                file = QFileInfo(fileName).path();
QFileDialog::Options opts = settings->value("UseNativeDialogs", DEF_USE_NATIVE_DIALOGS).toBool() ? QFileDialog::Options() : QFileDialog::DontUseNativeDialog;
        file = QFileDialog::getOpenFileName(this, tr("Task Load"), file, filters.join(";;"), NULL, opts);
        if (file.isEmpty() || !QFileInfo(file).isFile())
                return;
        if (settings->value("SaveLastUsed", DEF_SAVE_LAST_USED).toBool())
                settings->setValue("LastUsed/TaskLoadPath", QFileInfo(file).path());

        if (!tspmodel->loadTask(file))
                return;
        setFileName(file);
        tabWidget->setCurrentIndex(0);
        setWindowModified(false);
        solutionText->clear();
        toggleSolutionActions(false);
}

bool MainWindow::actionFileSaveTriggered()
{
        if ((fileName == tr("Untitled") + ".tspt") || !fileName.endsWith(".tspt", Qt::CaseInsensitive))
                return saveTask();
        else
                if (tspmodel->saveTask(fileName)) {
                        setWindowModified(false);
                        return true;
                } else
                        return false;
}

void MainWindow::actionFileSaveAsTaskTriggered()
{
        saveTask();
}

void MainWindow::actionFileSaveAsSolutionTriggered()
{
static QString selectedFile;
        if (selectedFile.isEmpty()) {
                if (settings->value("SaveLastUsed", DEF_SAVE_LAST_USED).toBool()) {
                        selectedFile = settings->value("LastUsed/SolutionSavePath").toString();
                }
        } else
                selectedFile = QFileInfo(selectedFile).path();
        if (!selectedFile.isEmpty())
                selectedFile.append("/");
        if (fileName == tr("Untitled") + ".tspt") {
#ifndef QT_NO_PRINTER
                selectedFile += "solution.pdf";
#else
                selectedFile += "solution.html";
#endif // QT_NO_PRINTER
        } else {
#ifndef QT_NO_PRINTER
                selectedFile += QFileInfo(fileName).completeBaseName() + ".pdf";
#else
                selectedFile += QFileInfo(fileName).completeBaseName() + ".html";
#endif // QT_NO_PRINTER
        }

QStringList filters;
#ifndef QT_NO_PRINTER
        filters.append(tr("PDF Files") + " (*.pdf)");
#endif
        filters.append(tr("HTML Files") + " (*.html *.htm)");
#if QT_VERSION >= 0x040500
        filters.append(tr("OpenDocument Files") + " (*.odt)");
#endif // QT_VERSION >= 0x040500
        filters.append(tr("All Files") + " (*)");

QFileDialog::Options opts(settings->value("UseNativeDialogs", DEF_USE_NATIVE_DIALOGS).toBool() ? QFileDialog::Options() : QFileDialog::DontUseNativeDialog);
QString file = QFileDialog::getSaveFileName(this, QString(), selectedFile, filters.join(";;"), NULL, opts);
        if (file.isEmpty())
                return;
        selectedFile = file;
        if (settings->value("SaveLastUsed", DEF_SAVE_LAST_USED).toBool())
                settings->setValue("LastUsed/SolutionSavePath", QFileInfo(selectedFile).path());
        QApplication::setOverrideCursor(QCursor(Qt::WaitCursor));
#ifndef QT_NO_PRINTER
        if (selectedFile.endsWith(".pdf",Qt::CaseInsensitive)) {
QPrinter printer(QPrinter::HighResolution);
                printer.setOutputFormat(QPrinter::PdfFormat);
                printer.setOutputFileName(selectedFile);
                solutionText->document()->print(&printer);
                QApplication::restoreOverrideCursor();
                return;
        }
#endif
        if (selectedFile.endsWith(".htm", Qt::CaseInsensitive) || selectedFile.endsWith(".html", Qt::CaseInsensitive)) {
QFile file(selectedFile);
                if (!file.open(QFile::WriteOnly)) {
                        QApplication::restoreOverrideCursor();
                        QMessageBox::critical(this, tr("Solution Save"), tr("Unable to save the solution.\nError: %1").arg(file.errorString()));
                        return;
                }
QFileInfo fi(selectedFile);
QString format = settings->value("Output/GraphImageFormat", DEF_GRAPH_IMAGE_FORMAT).toString();
#if !defined(NOSVG) && (QT_VERSION >= 0x040500)
        if (!QImageWriter::supportedImageFormats().contains(format.toAscii()) && (format != "svg")) {
#else // NOSVG && QT_VERSION >= 0x040500
        if (!QImageWriter::supportedImageFormats().contains(format.toAscii())) {
#endif // NOSVG && QT_VERSION >= 0x040500
                format = DEF_GRAPH_IMAGE_FORMAT;
                settings->remove("Output/GraphImageFormat");
        }
QString html = solutionText->document()->toHtml("UTF-8"),
                img =  fi.completeBaseName() + "." + format;
                html.replace(QRegExp("<img\\s+src=\"tspsg://graph.pic\""), QString("<img src=\"%1\" alt=\"%2\"").arg(img, tr("Solution Graph")));

                // Saving solution text as HTML
QTextStream ts(&file);
                ts.setCodec(QTextCodec::codecForName("UTF-8"));
                ts << html;
                file.close();

                // Saving solution graph as SVG or PNG (depending on settings and SVG support)
#if !defined(NOSVG) && (QT_VERSION >= 0x040500)
                if (format == "svg") {
QSvgGenerator svg;
                        svg.setSize(QSize(graph.width(), graph.height()));
                        svg.setResolution(graph.logicalDpiX());
                        svg.setFileName(fi.path() + "/" + img);
                        svg.setTitle(tr("Solution Graph"));
                        svg.setDescription(tr("Generated with %1").arg(QApplication::applicationName()));
QPainter p;
                        p.begin(&svg);
                        p.drawPicture(1, 1, graph);
                        p.end();
                } else {
#endif // NOSVG && QT_VERSION >= 0x040500
QImage i(graph.width(), graph.height(), QImage::Format_ARGB32);
                        i.fill(0x00FFFFFF);
QPainter p;
                        p.begin(&i);
                        p.drawPicture(1, 1, graph);
                        p.end();
QImageWriter pic(fi.path() + "/" + img);
                        if (pic.supportsOption(QImageIOHandler::Description)) {
                                pic.setText("Title", "Solution Graph");
                                pic.setText("Software", QApplication::applicationName());
                        }
                        if (format == "png")
                                pic.setQuality(5);
                        else if (format == "jpeg")
                                pic.setQuality(80);
                        if (!pic.write(i)) {
                                QApplication::restoreOverrideCursor();
                                QMessageBox::critical(this, tr("Solution Save"), tr("Unable to save the solution graph.\nError: %1").arg(pic.errorString()));
                                return;
                        }
#if !defined(NOSVG) && (QT_VERSION >= 0x040500)
                }
#endif // NOSVG && QT_VERSION >= 0x040500

// Qt < 4.5 has no QTextDocumentWriter class
#if QT_VERSION >= 0x040500
        } else {
QTextDocumentWriter dw(selectedFile);
                if (!selectedFile.endsWith(".odt",Qt::CaseInsensitive))
                        dw.setFormat("plaintext");
                if (!dw.write(solutionText->document()))
                        QMessageBox::critical(this, tr("Solution Save"), tr("Unable to save the solution.\nError: %1").arg(dw.device()->errorString()));
#endif // QT_VERSION >= 0x040500
        }
        QApplication::restoreOverrideCursor();
}

#ifndef QT_NO_PRINTER
void MainWindow::actionFilePrintPreviewTriggered()
{
QPrintPreviewDialog ppd(printer, this);
        connect(&ppd,SIGNAL(paintRequested(QPrinter *)),SLOT(printPreview(QPrinter *)));
        ppd.exec();
}

void MainWindow::actionFilePrintTriggered()
{
QPrintDialog pd(printer,this);
        if (pd.exec() != QDialog::Accepted)
                return;
        QApplication::setOverrideCursor(QCursor(Qt::WaitCursor));
        solutionText->print(printer);
        QApplication::restoreOverrideCursor();
}
#endif // QT_NO_PRINTER

void MainWindow::actionSettingsPreferencesTriggered()
{
SettingsDialog sd(this);
        if (sd.exec() != QDialog::Accepted)
                return;
        if (sd.colorChanged() || sd.fontChanged()) {
                if (!solutionText->document()->isEmpty() && sd.colorChanged())
                        QMessageBox::information(this, tr("Settings Changed"), tr("You have changed color settings.\nThey will be applied to the next solution output."));
                initDocStyleSheet();
        }
        if (sd.translucencyChanged() != 0)
                toggleTranclucency(sd.translucencyChanged() == 1);
}

void MainWindow::actionSettingsLanguageAutodetectTriggered(bool checked)
{
        if (checked) {
                settings->remove("Language");
                QMessageBox::information(this, tr("Language change"), tr("Language will be autodetected on the next %1 start.").arg(QApplication::applicationName()));
        } else
                settings->setValue("Language", groupSettingsLanguageList->checkedAction()->data().toString());
}

void MainWindow::groupSettingsLanguageListTriggered(QAction *action)
{
        if (actionSettingsLanguageAutodetect->isChecked()) {
                // We have language autodetection. It needs to be disabled to change language.
                if (QMessageBox::question(this, tr("Language change"), tr("You have language autodetection turned on.\nIt needs to be off.\nDo you wish to turn it off?"), QMessageBox::Yes | QMessageBox::No) == QMessageBox::Yes) {
                        actionSettingsLanguageAutodetect->trigger();
                } else
                        return;
        }
bool untitled = (fileName == tr("Untitled") + ".tspt");
        if (loadLanguage(action->data().toString())) {
                QApplication::setOverrideCursor(QCursor(Qt::WaitCursor));
                settings->setValue("Language",action->data().toString());
                retranslateUi();
                if (untitled)
                        setFileName();
#ifdef Q_OS_WIN32
                if (QtWin::isCompositionEnabled() && settings->value("UseTranslucency", DEF_USE_TRANSLUCENCY).toBool())  {
                        toggleStyle(labelVariant, true);
                        toggleStyle(labelCities, true);
                }
#endif
                QApplication::restoreOverrideCursor();
                if (!solutionText->document()->isEmpty())
                        QMessageBox::information(this, tr("Settings Changed"), tr("You have changed the application language.\nTo get current solution output in the new language\nyou need to re-run the solution process."));
        }
}

void MainWindow::actionSettingsStyleSystemTriggered(bool checked)
{
        if (checked) {
                settings->remove("Style");
                QMessageBox::information(this, tr("Style Change"), tr("To apply the default style you need to restart %1.").arg(QApplication::applicationName()));
        } else {
                settings->setValue("Style", groupSettingsStyleList->checkedAction()->text());
        }
}

void MainWindow::groupSettingsStyleListTriggered(QAction *action)
{
QStyle *s = QStyleFactory::create(action->text());
        if (s != NULL) {
                QApplication::setStyle(s);
                settings->setValue("Style", action->text());
                actionSettingsStyleSystem->setChecked(false);
        }
}

#ifndef HANDHELD
void MainWindow::actionSettingsToolbarsConfigureTriggered()
{
QtToolBarDialog dlg(this);
        dlg.setToolBarManager(toolBarManager);
        dlg.exec();
QToolButton *tb = static_cast<QToolButton *>(toolBarMain->widgetForAction(actionFileSave));
        if (tb != NULL) {
                tb->setMenu(menuFileSaveAs);
                tb->setPopupMode(QToolButton::MenuButtonPopup);
                tb->resize(tb->sizeHint());
        }

        loadToolbarList();
}
#endif // HANDHELD

#ifdef Q_OS_WIN32
void MainWindow::actionHelpCheck4UpdatesTriggered()
{
        if (!hasUpdater()) {
                QMessageBox::warning(this, tr("Unsupported Feature"), tr("Sorry, but this feature is not supported on your platform\nor support for this feature was not installed."));
                return;
        }

        QApplication::setOverrideCursor(QCursor(Qt::WaitCursor));
        QProcess::execute("updater/Update.exe -name=\"TSPSG: TSP Solver and Generator\" -check=\"freeupdate\"");
        QApplication::restoreOverrideCursor();
}
#endif // Q_OS_WIN32

void MainWindow::actionHelpAboutTriggered()
{
        QApplication::setOverrideCursor(QCursor(Qt::WaitCursor));

QString title;
#ifdef HANDHELD
        title += QString("<b>TSPSG<br>TSP Solver and Generator</b><br>");
#else
        title += QString("<b>%1</b><br>").arg(QApplication::applicationName());
#endif // HANDHELD
        title += QString("%1: <b>%2</b><br>").arg(tr("Version"), QApplication::applicationVersion());
#ifndef HANDHELD
        title += QString("<b>&copy; 2007-%1 <a href=\"http://%2/\">%3</a></b><br>").arg(QDate::currentDate().toString("yyyy"), QApplication::organizationDomain(), QApplication::organizationName());
#endif // HANDHELD
        title += QString("<b><a href=\"http://tspsg.info/\">http://tspsg.info/</a></b>");

QString about;
        about += QString("%1: <b>%2</b><br>").arg(tr("Target OS (ARCH)"), OS);
#ifndef STATIC_BUILD
        about += QString("%1 (%2):<br>").arg(tr("Qt library"), tr("shared"));
        about += QString("&nbsp;&nbsp;&nbsp;&nbsp;%1: <b>%2</b><br>").arg(tr("Build time"), QT_VERSION_STR);
        about += QString("&nbsp;&nbsp;&nbsp;&nbsp;%1: <b>%2</b><br>").arg(tr("Runtime"), qVersion());
#else
        about += QString("%1: <b>%2</b> (%3)<br>").arg(tr("Qt library"), QT_VERSION_STR, tr("static"));
#endif // STATIC_BUILD
        about += tr("Buid <b>%1</b>, built on <b>%2</b> at <b>%3</b>").arg(BUILD_NUMBER).arg(__DATE__).arg(__TIME__) + "<br>";
        about += QString("%1: <b>%2</b><br>").arg(tr("Algorithm"), CTSPSolver::getVersionId());
        about += "<br>";
        about += tr("This program is free software: you can redistribute it and/or modify<br>\n"
                "it under the terms of the GNU General Public License as published by<br>\n"
                "the Free Software Foundation, either version 3 of the License, or<br>\n"
                "(at your option) any later version.<br>\n"
                "<br>\n"
                "This program is distributed in the hope that it will be useful,<br>\n"
                "but WITHOUT ANY WARRANTY; without even the implied warranty of<br>\n"
                "MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the<br>\n"
                "GNU General Public License for more details.<br>\n"
                "<br>\n"
                "You should have received a copy of the GNU General Public License<br>\n"
                "along with TSPSG.  If not, see <a href=\"http://www.gnu.org/licenses/\">www.gnu.org/licenses/</a>.");

QString credits;
        credits += tr("%1 was created using <b>Qt&nbsp;framework</b> licensed "
                "under the terms of the GNU Lesser General Public License,<br>\n"
                "see <a href=\"http://qt.nokia.com/\">qt.nokia.com</a><br>\n"
                "<br>\n"
                "Most icons used in %1 are part of <b>Oxygen&nbsp;Icons</b> project "
                "licensed according to the GNU Lesser General Public License,<br>\n"
                "see <a href=\"http://www.oxygen-icons.org/\">www.oxygen-icons.org</a><br>\n"
                "<br>\n"
                "Country flag icons used in %1 are part of the free "
                "<b>Flag&nbsp;Icons</b> collection created by <b>IconDrawer</b>,<br>\n"
                "see <a href=\"http://www.icondrawer.com/\">www.icondrawer.com</a>")
                        .arg(QApplication::applicationName());

QFile f(":/files/COPYING");
        f.open(QIODevice::ReadOnly);

QString translation = QApplication::translate("--------", "AUTHORS %1", "Please, provide translator credits here. %1 will be replaced with VERSION");
        if ((translation != "AUTHORS %1") && (translation.contains("%1"))) {
QString about = QApplication::translate("--------", "VERSION", "Please, provide your translation version here.");
                if (about != "VERSION")
                        translation = translation.arg(about);
        }

QDialog *dlg = new QDialog(this);
QLabel *lblIcon = new QLabel(dlg),
        *lblTitle = new QLabel(dlg);
#ifdef HANDHELD
QLabel *lblSubTitle = new QLabel(QString("<b>&copy; 2007-%1 <a href=\"http://%2/\">%3</a></b>").arg(QDate::currentDate().toString("yyyy"), QApplication::organizationDomain(), QApplication::organizationName()), dlg);
#endif // HANDHELD
QTabWidget *tabs = new QTabWidget(dlg);
QTextBrowser *txtAbout = new QTextBrowser(dlg);
QTextBrowser *txtLicense = new QTextBrowser(dlg);
QTextBrowser *txtCredits = new QTextBrowser(dlg);
QVBoxLayout *vb = new QVBoxLayout();
QHBoxLayout *hb1 = new QHBoxLayout(),
        *hb2 = new QHBoxLayout();
QDialogButtonBox *bb = new QDialogButtonBox(QDialogButtonBox::Ok, Qt::Horizontal, dlg);

        lblTitle->setOpenExternalLinks(true);
        lblTitle->setText(title);
        lblTitle->setAlignment(Qt::AlignTop);
        lblTitle->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Preferred);
#ifndef HANDHELD
        lblTitle->setStyleSheet(QString("QLabel {background-color: %1; border-color: %2; border-width: 1px; border-style: solid; border-radius: 4px; padding: 1px;}").arg(palette().alternateBase().color().name(), palette().shadow().color().name()));
#endif // HANDHELD

        lblIcon->setPixmap(QPixmap(":/images/tspsg.png").scaledToHeight(lblTitle->sizeHint().height(), Qt::SmoothTransformation));
        lblIcon->setAlignment(Qt::AlignVCenter);
#ifndef HANDHELD
        lblIcon->setStyleSheet(QString("QLabel {background-color: white; border-color: %1; border-width: 1px; border-style: solid; border-radius: 4px; padding: 1px;}").arg(palette().windowText().color().name()));
#endif // HANDHELD

        hb1->addWidget(lblIcon);
        hb1->addWidget(lblTitle);

        txtAbout->setWordWrapMode(QTextOption::NoWrap);
        txtAbout->setOpenExternalLinks(true);
        txtAbout->setHtml(about);
        txtAbout->moveCursor(QTextCursor::Start);
        txtAbout->setFrameShape(QFrame::NoFrame);

//      txtCredits->setWordWrapMode(QTextOption::NoWrap);
        txtCredits->setOpenExternalLinks(true);
        txtCredits->setHtml(credits);
        txtCredits->moveCursor(QTextCursor::Start);
        txtCredits->setFrameShape(QFrame::NoFrame);

        txtLicense->setWordWrapMode(QTextOption::NoWrap);
        txtLicense->setOpenExternalLinks(true);
        txtLicense->setText(f.readAll());
        txtLicense->moveCursor(QTextCursor::Start);
        txtLicense->setFrameShape(QFrame::NoFrame);

        bb->button(QDialogButtonBox::Ok)->setCursor(QCursor(Qt::PointingHandCursor));
        bb->button(QDialogButtonBox::Ok)->setIcon(QIcon::fromTheme("dialog-ok", QIcon(":/images/icons/dialog-ok.png")));

        hb2->addWidget(bb);

#ifdef Q_OS_WINCE_WM
        vb->setMargin(3);
#endif // Q_OS_WINCE_WM
        vb->addLayout(hb1);
#ifdef HANDHELD
        vb->addWidget(lblSubTitle);
#endif // HANDHELD

        tabs->addTab(txtAbout, tr("About"));
        tabs->addTab(txtLicense, tr("License"));
        tabs->addTab(txtCredits, tr("Credits"));
        if (translation != "AUTHORS %1") {
QTextBrowser *txtTranslation = new QTextBrowser(dlg);
//              txtTranslation->setWordWrapMode(QTextOption::NoWrap);
                txtTranslation->setOpenExternalLinks(true);
                txtTranslation->setText(translation);
                txtTranslation->moveCursor(QTextCursor::Start);
                txtTranslation->setFrameShape(QFrame::NoFrame);

                tabs->addTab(txtTranslation, tr("Translation"));
        }
#ifndef HANDHELD
        tabs->setStyleSheet(QString("QTabWidget::pane {background-color: %1; border-color: %3; border-width: 1px; border-style: solid; border-bottom-left-radius: 4px; border-bottom-right-radius: 4px; padding: 1px;} QTabBar::tab {background-color: %2; border-color: %3; border-width: 1px; border-style: solid; border-bottom: none; border-top-left-radius: 4px; border-top-right-radius: 4px; padding: 2px 6px;} QTabBar::tab:selected {background-color: %4;} QTabBar::tab:!selected {margin-top: 1px;}").arg(palette().base().color().name(), palette().button().color().name(), palette().shadow().color().name(), palette().light().color().name()));
#endif // HANDHELD

        vb->addWidget(tabs);
        vb->addLayout(hb2);

        dlg->setWindowFlags(Qt::Dialog | Qt::CustomizeWindowHint | Qt::WindowTitleHint | Qt::WindowCloseButtonHint);
        dlg->setWindowTitle(tr("About %1").arg(QApplication::applicationName()));
        dlg->setWindowIcon(QIcon::fromTheme("help-about", QIcon(":/images/icons/help-about.png")));
        dlg->setLayout(vb);

        connect(bb, SIGNAL(accepted()), dlg, SLOT(accept()));

#ifdef Q_OS_WIN32
        // Adding some eyecandy in Vista and 7 :-)
        if (QtWin::isCompositionEnabled())  {
                QtWin::enableBlurBehindWindow(dlg, true);
        }
#endif // Q_OS_WIN32

        dlg->resize(450, 350);
        QApplication::restoreOverrideCursor();

        dlg->exec();

        delete dlg;
}

void MainWindow::buttonBackToTaskClicked()
{
        tabWidget->setCurrentIndex(0);
}

void MainWindow::buttonRandomClicked()
{
        QApplication::setOverrideCursor(QCursor(Qt::WaitCursor));
        tspmodel->randomize();
        QApplication::restoreOverrideCursor();
}

void MainWindow::buttonSolveClicked()
{
TMatrix matrix;
QList<double> row;
int n = spinCities->value();
bool ok;
        for (int r = 0; r < n; r++) {
                row.clear();
                for (int c = 0; c < n; c++) {
                        row.append(tspmodel->index(r,c).data(Qt::UserRole).toDouble(&ok));
                        if (!ok) {
                                QMessageBox::critical(this, tr("Data error"), tr("Error in cell [Row %1; Column %2]: Invalid data format.").arg(r + 1).arg(c + 1));
                                return;
                        }
                }
                matrix.append(row);
        }

QProgressDialog pd(this);
QProgressBar *pb = new QProgressBar(&pd);
        pb->setAlignment(Qt::AlignCenter);
        pb->setFormat(tr("%v of %1 parts found").arg(n));
        pd.setBar(pb);
QPushButton *cancel = new QPushButton(&pd);
        cancel->setIcon(QIcon::fromTheme("dialog-cancel", QIcon(":/images/icons/dialog-cancel.png")));
        cancel->setText(QApplication::translate("QProgressDialog", "Cancel", "No need to translate this. This translation will be taken from Qt translation files."));
        pd.setCancelButton(cancel);
        pd.setMaximum(n);
        pd.setAutoReset(false);
        pd.setLabelText(tr("Calculating optimal route..."));
        pd.setWindowTitle(tr("Solution Progress"));
        pd.setWindowModality(Qt::ApplicationModal);
        pd.setWindowFlags(Qt::Dialog | Qt::CustomizeWindowHint | Qt::WindowTitleHint);
        pd.show();

#ifdef Q_OS_WIN32
HRESULT hr = CoCreateInstance(CLSID_TaskbarList, NULL, CLSCTX_INPROC_SERVER, IID_ITaskbarList3, (LPVOID*)&tl);
        if (SUCCEEDED(hr)) {
                hr = tl->HrInit();
                if (FAILED(hr)) {
                        tl->Release();
                        tl = NULL;
                } else {
//                      tl->SetProgressState(winId(), TBPF_INDETERMINATE);
                        tl->SetProgressValue(winId(), 0, n * 2);
                }
        }
#endif

CTSPSolver solver;
        solver.setCleanupOnCancel(false);
        connect(&solver, SIGNAL(routePartFound(int)), &pd, SLOT(setValue(int)));
        connect(&pd, SIGNAL(canceled()), &solver, SLOT(cancel()));
#ifdef Q_OS_WIN32
        if (tl != NULL)
                connect(&solver, SIGNAL(routePartFound(int)), SLOT(solverRoutePartFound(int)));
#endif
SStep *root = solver.solve(n, matrix);
#ifdef Q_OS_WIN32
        if (tl != NULL)
                disconnect(&solver, SIGNAL(routePartFound(int)), this, SLOT(solverRoutePartFound(int)));
#endif
        disconnect(&solver, SIGNAL(routePartFound(int)), &pd, SLOT(setValue(int)));
        disconnect(&pd, SIGNAL(canceled()), &solver, SLOT(cancel()));
        if (!root) {
                pd.reset();
                if (!solver.wasCanceled()) {
#ifdef Q_OS_WIN32
                        if (tl != NULL) {
//                              tl->SetProgressValue(winId(), n, n * 2);
                                tl->SetProgressState(winId(), TBPF_ERROR);
                        }
#endif
                        QApplication::alert(this);
                        QMessageBox::warning(this, tr("Solution Result"), tr("Unable to find a solution.\nMaybe, this task has no solution."));
                }
                pd.setLabelText(tr("Cleaning up..."));
                pd.setMaximum(0);
                pd.setCancelButton(NULL);
                pd.show();
#ifdef Q_OS_WIN32
                if (tl != NULL)
                        tl->SetProgressState(winId(), TBPF_INDETERMINATE);
#endif
                QApplication::processEvents(QEventLoop::ExcludeUserInputEvents);

QFuture<void> f = QtConcurrent::run(&solver, &CTSPSolver::cleanup, false);
                while (!f.isFinished()) {
                        QApplication::processEvents(QEventLoop::ExcludeUserInputEvents);
                }
                pd.reset();
#ifdef Q_OS_WIN32
                if (tl != NULL) {
                        tl->SetProgressState(winId(), TBPF_NOPROGRESS);
                        tl->Release();
                        tl = NULL;
                }
#endif
                return;
        }
        pb->setFormat(tr("Generating header"));
        pd.setLabelText(tr("Generating solution output..."));
        pd.setMaximum(solver.getTotalSteps() + 1);
        pd.setValue(0);

#ifdef Q_OS_WIN32
        if (tl != NULL)
                tl->SetProgressValue(winId(), spinCities->value(), spinCities->value() + solver.getTotalSteps() + 1);
#endif

        solutionText->clear();
        solutionText->setDocumentTitle(tr("Solution of Variant #%1 Task").arg(spinVariant->value()));

QPainter pic;
        if (settings->value("Output/ShowGraph", DEF_SHOW_GRAPH).toBool()) {
                pic.begin(&graph);
                pic.setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform);
QFont font = settings->value("Output/Font", QFont(DEF_FONT_FACE, 9)).value<QFont>();
                if (settings->value("Output/HQGraph", DEF_HQ_GRAPH).toBool()) {
                        font.setWeight(QFont::DemiBold);
                        font.setPointSizeF(font.pointSizeF() * 2);
                }
                pic.setFont(font);
                pic.setBrush(QBrush(QColor(Qt::white)));
                if (settings->value("Output/HQGraph", DEF_HQ_GRAPH).toBool()) {
QPen pen = pic.pen();
                        pen.setWidth(2);
                        pic.setPen(pen);
                }
                pic.setBackgroundMode(Qt::OpaqueMode);
        }

QTextDocument *doc = solutionText->document();
QTextCursor cur(doc);

        cur.beginEditBlock();
        cur.setBlockFormat(fmt_paragraph);
        cur.insertText(tr("Variant #%1 Task").arg(spinVariant->value()), fmt_default);
        cur.insertBlock(fmt_paragraph);
        cur.insertText(tr("Task:"));
        outputMatrix(cur, matrix);
        if (settings->value("Output/ShowGraph", DEF_SHOW_GRAPH).toBool()) {
#ifdef _T_T_L_
                _b_ _i_ _z_ _a_ _r_ _r_ _e_
#endif
                drawNode(pic, 0);
        }
        cur.insertHtml("<hr>");
        cur.insertBlock(fmt_paragraph);
int imgpos = cur.position();
        cur.insertText(tr("Variant #%1 Solution").arg(spinVariant->value()), fmt_default);
        cur.endEditBlock();

SStep *step = root;
int c = n = 1;
        pb->setFormat(tr("Generating step %v"));
        while ((step->next != SStep::NoNextStep) && (c < spinCities->value())) {
                if (pd.wasCanceled()) {
                        pd.setLabelText(tr("Cleaning up..."));
                        pd.setMaximum(0);
                        pd.setCancelButton(NULL);
                        pd.show();
                        QApplication::processEvents(QEventLoop::ExcludeUserInputEvents);
#ifdef Q_OS_WIN32
                        if (tl != NULL)
                                tl->SetProgressState(winId(), TBPF_INDETERMINATE);
#endif
QFuture<void> f = QtConcurrent::run(&solver, &CTSPSolver::cleanup, false);
                        while (!f.isFinished()) {
                                QApplication::processEvents(QEventLoop::ExcludeUserInputEvents);
                        }
                        solutionText->clear();
                        toggleSolutionActions(false);
#ifdef Q_OS_WIN32
                        if (tl != NULL) {
                                tl->SetProgressState(winId(), TBPF_NOPROGRESS);
                                tl->Release();
                                tl = NULL;
                        }
#endif
                        return;
                }
                pd.setValue(n);
#ifdef Q_OS_WIN32
                if (tl != NULL)
                        tl->SetProgressValue(winId(), spinCities->value() + n, spinCities->value() + solver.getTotalSteps() + 1);
#endif

                cur.beginEditBlock();
                cur.insertBlock(fmt_paragraph);
                cur.insertText(tr("Step #%1").arg(n));
                if (settings->value("Output/ShowMatrix", DEF_SHOW_MATRIX).toBool() && (!settings->value("Output/UseShowMatrixLimit", DEF_USE_SHOW_MATRIX_LIMIT).toBool() || (settings->value("Output/UseShowMatrixLimit", DEF_USE_SHOW_MATRIX_LIMIT).toBool() && (spinCities->value() <= settings->value("Output/ShowMatrixLimit", DEF_SHOW_MATRIX_LIMIT).toInt())))) {
                        outputMatrix(cur, *step);
                }
                cur.insertBlock(fmt_paragraph);
                cur.insertText(tr("Selected route %1 %2 part.").arg((step->next == SStep::RightBranch) ? tr("with") : tr("without")).arg(tr("(%1;%2)").arg(step->candidate.nRow + 1).arg(step->candidate.nCol + 1)), fmt_default);
                if (!step->alts.empty()) {
                        SStep::SCandidate cand;
                        QString alts;
                        foreach(cand, step->alts) {
                                if (!alts.isEmpty())
                                        alts += ", ";
                                alts += tr("(%1;%2)").arg(cand.nRow + 1).arg(cand.nCol + 1);
                        }
                        cur.insertBlock(fmt_paragraph);
                        cur.insertText(tr("%n alternate candidate(s) for branching: %1.", "", step->alts.count()).arg(alts), fmt_altlist);
                }
                cur.insertBlock(fmt_paragraph);
                cur.insertText(" ", fmt_default);
                cur.endEditBlock();

                if (settings->value("Output/ShowGraph", DEF_SHOW_GRAPH).toBool()) {
                        if (step->prNode != NULL)
                                drawNode(pic, n, false, step->prNode);
                        if (step->plNode != NULL)
                                drawNode(pic, n, true, step->plNode);
                }
                n++;

                if (step->next == SStep::RightBranch) {
                        c++;
                        step = step->prNode;
                } else if (step->next == SStep::LeftBranch) {
                        step = step->plNode;
                } else
                        break;
        }
        pb->setFormat(tr("Generating footer"));
        pd.setValue(n);
#ifdef Q_OS_WIN32
        if (tl != NULL)
                tl->SetProgressValue(winId(), spinCities->value() + n, spinCities->value() + solver.getTotalSteps() + 1);
#endif

        cur.beginEditBlock();
        cur.insertBlock(fmt_paragraph);
        if (solver.isOptimal())
                cur.insertText(tr("Optimal path:"));
        else
                cur.insertText(tr("Resulting path:"));

        cur.insertBlock(fmt_paragraph);
        cur.insertText("  " + solver.getSortedPath(tr("City %1")));

        cur.insertBlock(fmt_paragraph);
        if (isInteger(step->price))
                cur.insertHtml("<p>" + tr("The price is <b>%n</b> unit(s).", "", qRound(step->price)) + "</p>");
        else
                cur.insertHtml("<p>" + tr("The price is <b>%1</b> units.").arg(step->price, 0, 'f', settings->value("Task/FractionalAccuracy", DEF_FRACTIONAL_ACCURACY).toInt()) + "</p>");
        if (!solver.isOptimal()) {
                cur.insertBlock(fmt_paragraph);
                cur.insertText(" ");
                cur.insertBlock(fmt_paragraph);
                cur.insertHtml("<p>" + tr("<b>WARNING!!!</b><br>This result is a record, but it may not be optimal.<br>Iterations need to be continued to check whether this result is optimal or get an optimal one.") + "</p>");
        }
        cur.endEditBlock();

        if (settings->value("Output/ShowGraph", DEF_SHOW_GRAPH).toBool()) {
                pic.end();

QImage i(graph.width() + 1, graph.height() + 1, QImage::Format_RGB32);
                i.fill(0xFFFFFF);
                pic.begin(&i);
                pic.drawPicture(1, 1, graph);
                pic.end();
                doc->addResource(QTextDocument::ImageResource, QUrl("tspsg://graph.pic"), i);

QTextImageFormat img;
                img.setName("tspsg://graph.pic");
                if (settings->value("Output/HQGraph", DEF_HQ_GRAPH).toBool()) {
                        img.setWidth(i.width() / 2);
                        img.setHeight(i.height() / 2);
                } else {
                        img.setWidth(i.width());
                        img.setHeight(i.height());
                }

                cur.setPosition(imgpos);
                cur.insertImage(img, QTextFrameFormat::FloatRight);
        }

        if (settings->value("Output/ScrollToEnd", DEF_SCROLL_TO_END).toBool()) {
                // Scrolling to the end of the text.
                solutionText->moveCursor(QTextCursor::End);
        } else
                solutionText->moveCursor(QTextCursor::Start);

        pd.setLabelText(tr("Cleaning up..."));
        pd.setMaximum(0);
        pd.setCancelButton(NULL);
        QApplication::processEvents(QEventLoop::ExcludeUserInputEvents);
#ifdef Q_OS_WIN32
        if (tl != NULL)
                tl->SetProgressState(winId(), TBPF_INDETERMINATE);
#endif
QFuture<void> f = QtConcurrent::run(&solver, &CTSPSolver::cleanup, false);
        while (!f.isFinished()) {
                QApplication::processEvents(QEventLoop::ExcludeUserInputEvents);
        }
        toggleSolutionActions();
        tabWidget->setCurrentIndex(1);
#ifdef Q_OS_WIN32
        if (tl != NULL) {
                tl->SetProgressState(winId(), TBPF_NOPROGRESS);
                tl->Release();
                tl = NULL;
        }
#endif

        pd.reset();
        QApplication::alert(this, 3000);
}

void MainWindow::dataChanged()
{
        setWindowModified(true);
}

void MainWindow::dataChanged(const QModelIndex &tl, const QModelIndex &br)
{
        setWindowModified(true);
        if (settings->value("Autosize", DEF_AUTOSIZE).toBool()) {
                for (int k = tl.row(); k <= br.row(); k++)
                        taskView->resizeRowToContents(k);
                for (int k = tl.column(); k <= br.column(); k++)
                        taskView->resizeColumnToContents(k);
        }
}

#ifdef Q_OS_WINCE_WM
void MainWindow::changeEvent(QEvent *ev)
{
        if ((ev->type() == QEvent::ActivationChange) && isActiveWindow())
                desktopResized(0);

        QWidget::changeEvent(ev);
}

void MainWindow::desktopResized(int screen)
{
        if ((screen != 0) || !isActiveWindow())
                return;

QRect availableGeometry = QApplication::desktop()->availableGeometry(0);
        if (currentGeometry != availableGeometry) {
                QApplication::setOverrideCursor(QCursor(Qt::WaitCursor));
                /*!
                 * \hack HACK: This hack checks whether \link QDesktopWidget::availableGeometry() availableGeometry()\endlink's \c top + \c hegiht = \link QDesktopWidget::screenGeometry() screenGeometry()\endlink's \c height.
                 *  If \c true, the window gets maximized. If we used \c setGeometry() in this case, the bottom of the
                 *  window would end up being behind the soft buttons. Is this a bug in Qt or Windows Mobile?
                 */
                if ((availableGeometry.top() + availableGeometry.height()) == QApplication::desktop()->screenGeometry().height()) {
                        setWindowState(windowState() | Qt::WindowMaximized);
                } else {
                        if (windowState() & Qt::WindowMaximized)
                                setWindowState(windowState() ^ Qt::WindowMaximized);
                        setGeometry(availableGeometry);
                }
                currentGeometry = availableGeometry;
                QApplication::restoreOverrideCursor();
        }
}
#endif // Q_OS_WINCE_WM

void MainWindow::numCitiesChanged(int nCities)
{
        blockSignals(true);
        spinCities->setValue(nCities);
        blockSignals(false);
}

#ifndef QT_NO_PRINTER
void MainWindow::printPreview(QPrinter *printer)
{
        solutionText->print(printer);
}
#endif // QT_NO_PRINTER

#ifdef Q_OS_WIN32
void MainWindow::solverRoutePartFound(int n)
{
#ifdef Q_OS_WIN32
        tl->SetProgressValue(winId(), n, spinCities->value() * 2);
#else
        Q_UNUSED(n);
#endif // Q_OS_WIN32
}
#endif // Q_OS_WIN32

void MainWindow::spinCitiesValueChanged(int n)
{
        QApplication::setOverrideCursor(QCursor(Qt::WaitCursor));
int count = tspmodel->numCities();
        tspmodel->setNumCities(n);
        if ((n > count) && settings->value("Autosize", DEF_AUTOSIZE).toBool())
                for (int k = count; k < n; k++) {
                        taskView->resizeColumnToContents(k);
                        taskView->resizeRowToContents(k);
                }
        QApplication::restoreOverrideCursor();
}

void MainWindow::closeEvent(QCloseEvent *ev)
{
        if (!maybeSave()) {
                ev->ignore();
                return;
        }
        if (!settings->value("SettingsReset", false).toBool()) {
                settings->setValue("NumCities", spinCities->value());

                // Saving Main Window state
#ifndef HANDHELD
                if (settings->value("SavePos", DEF_SAVEPOS).toBool()) {
                        settings->beginGroup("MainWindow");
                        settings->setValue("Geometry", saveGeometry());
                        settings->setValue("State", saveState());
                        settings->setValue("Toolbars", toolBarManager->saveState());
                        settings->endGroup();
                }
#endif // HANDHELD
        } else {
                settings->remove("SettingsReset");
        }

        QMainWindow::closeEvent(ev);
}

void MainWindow::dragEnterEvent(QDragEnterEvent *ev)
{
        if (ev->mimeData()->hasUrls() && (ev->mimeData()->urls().count() == 1)) {
QFileInfo fi(ev->mimeData()->urls().first().toLocalFile());
                if ((fi.suffix() == "tspt") || (fi.suffix() == "zkt"))
                        ev->acceptProposedAction();
        }
}

void MainWindow::drawNode(QPainter &pic, int nstep, bool left, SStep *step)
{
int r;
        if (settings->value("Output/HQGraph", DEF_HQ_GRAPH).toBool())
                r = 70;
        else
                r = 35;
qreal x, y;
        if (step != NULL)
                x = left ? r : r * 3.5;
        else
                x = r * 2.25;
        y = r * (3 * nstep + 1);

#ifdef _T_T_L_
        if (nstep == -481124) {
                _t_t_l_(pic, r, x);
                return;
        }
#endif

        pic.drawEllipse(QPointF(x, y), r, r);

        if (step != NULL) {
QFont font;
                if (left) {
                        font = pic.font();
                        font.setStrikeOut(true);
                        pic.setFont(font);
                }
                pic.drawText(QRectF(x - r, y - r, r * 2, r * 2), Qt::AlignCenter, tr("(%1;%2)").arg(step->pNode->candidate.nRow + 1).arg(step->pNode->candidate.nCol + 1) + "\n");
                if (left) {
                        font.setStrikeOut(false);
                        pic.setFont(font);
                }
                if (step->price != INFINITY) {
                        pic.drawText(QRectF(x - r, y - r, r * 2, r * 2), Qt::AlignCenter, isInteger(step->price) ?  QString("\n%1").arg(step->price) : QString("\n%1").arg(step->price, 0, 'f', settings->value("Task/FractionalAccuracy", DEF_FRACTIONAL_ACCURACY).toInt()));
                } else {
                        pic.drawText(QRectF(x - r, y - r, r * 2, r * 2), Qt::AlignCenter, "\n"INFSTR);
                }
        } else {
                pic.drawText(QRectF(x - r, y - r, r * 2, r * 2), Qt::AlignCenter, tr("Root"));
        }

        if (nstep == 1) {
                pic.drawLine(QPointF(x, y - r), QPointF(r * 2.25, y - 2 * r));
        } else if (nstep > 1) {
                pic.drawLine(QPointF(x, y - r), QPointF((step->pNode->pNode->next == SStep::RightBranch) ? r * 3.5 : r, y - 2 * r));
        }

}

void MainWindow::dropEvent(QDropEvent *ev)
{
        if (maybeSave() && tspmodel->loadTask(ev->mimeData()->urls().first().toLocalFile())) {
                setFileName(ev->mimeData()->urls().first().toLocalFile());
                tabWidget->setCurrentIndex(0);
                setWindowModified(false);
                solutionText->clear();
                toggleSolutionActions(false);

                ev->setDropAction(Qt::CopyAction);
                ev->accept();
        }
}

bool MainWindow::hasUpdater() const
{
#ifdef Q_OS_WIN32
        return QFile::exists("updater/Update.exe");
#else // Q_OS_WIN32
        return false;
#endif // Q_OS_WIN32
}

void MainWindow::initDocStyleSheet()
{
        solutionText->document()->setDefaultFont(settings->value("Output/Font", QFont(DEF_FONT_FACE, DEF_FONT_SIZE)).value<QFont>());

        fmt_paragraph.setTopMargin(0);
        fmt_paragraph.setRightMargin(10);
        fmt_paragraph.setBottomMargin(0);
        fmt_paragraph.setLeftMargin(10);

        fmt_table.setTopMargin(5);
        fmt_table.setRightMargin(10);
        fmt_table.setBottomMargin(5);
        fmt_table.setLeftMargin(10);
        fmt_table.setBorder(0);
        fmt_table.setBorderStyle(QTextFrameFormat::BorderStyle_None);
        fmt_table.setCellSpacing(5);

        fmt_cell.setAlignment(Qt::AlignHCenter);

        settings->beginGroup("Output/Colors");

QColor color = settings->value("Text", DEF_TEXT_COLOR).value<QColor>();
QColor hilight;
        if (color.value() < 192)
                hilight.setHsv(color.hue(), color.saturation(), 127 + qRound(color.value() / 2));
        else
                hilight.setHsv(color.hue(), color.saturation(), color.value() / 2);

        solutionText->document()->setDefaultStyleSheet(QString("* {color: %1;}").arg(color.name()));
        fmt_default.setForeground(QBrush(color));

        fmt_selected.setForeground(QBrush(settings->value("Selected", DEF_SELECTED_COLOR).value<QColor>()));
        fmt_selected.setFontWeight(QFont::Bold);

        fmt_alternate.setForeground(QBrush(settings->value("Alternate", DEF_ALTERNATE_COLOR).value<QColor>()));
        fmt_alternate.setFontWeight(QFont::Bold);
        fmt_altlist.setForeground(QBrush(hilight));

        settings->endGroup();

        solutionText->setTextColor(color);
}

void MainWindow::loadLangList()
{
QMap<QString, QStringList> langlist;
QFileInfoList langs;
QFileInfo lang;
QString name;
QStringList language, dirs;
QTranslator t;
QDir dir;
        dir.setFilter(QDir::Files);
        dir.setNameFilters(QStringList("tspsg_*.qm"));
        dir.setSorting(QDir::NoSort);

        dirs << PATH_L10N << ":/l10n";
        foreach (QString dirname, dirs) {
                dir.setPath(dirname);
                if (dir.exists()) {
                        langs = dir.entryInfoList();
                        for (int k = 0; k < langs.size(); k++) {
                                lang = langs.at(k);
                                if (lang.completeBaseName().compare("tspsg_en", Qt::CaseInsensitive) && !langlist.contains(lang.completeBaseName().mid(6)) && t.load(lang.completeBaseName(), dirname)) {

                                        language.clear();
                                        language.append(lang.completeBaseName().mid(6));
                                        language.append(t.translate("--------", "COUNTRY", "Please, provide an ISO 3166-1 alpha-2 country code for this translation language here (eg., UA).").toLower());
                                        language.append(t.translate("--------", "LANGNAME", "Please, provide a native name of your translation language here."));
                                        language.append(t.translate("MainWindow", "Set application language to %1", "").arg(name));

                                        langlist.insert(language.at(0), language);
                                }
                        }
                }
        }

QAction *a;
        foreach (language, langlist) {
                a = menuSettingsLanguage->addAction(language.at(2));
                a->setStatusTip(language.at(3));
                a->setIcon(QIcon::fromTheme(QString("flag-%1").arg(language.at(1)), QIcon(QString(":/images/icons/l10n/flag-%1.png").arg(language.at(1)))));
                a->setData(language.at(0));
                a->setCheckable(true);
                a->setActionGroup(groupSettingsLanguageList);
                if (settings->value("Language", QLocale::system().name()).toString().startsWith(language.at(0)))
                        a->setChecked(true);
        }
}

bool MainWindow::loadLanguage(const QString &lang)
{
// i18n
bool ad = false;
QString lng = lang;
        if (lng.isEmpty()) {
                ad = settings->value("Language", "").toString().isEmpty();
                lng = settings->value("Language", QLocale::system().name()).toString();
        }
static QTranslator *qtTranslator; // Qt library translator
        if (qtTranslator) {
                qApp->removeTranslator(qtTranslator);
                delete qtTranslator;
                qtTranslator = NULL;
        }
static QTranslator *translator; // Application translator
        if (translator) {
                qApp->removeTranslator(translator);
                delete translator;
                translator = NULL;
        }

        if (lng == "en")
                return true;

        // Trying to load system Qt library translation...
        qtTranslator = new QTranslator(this);
        if (qtTranslator->load("qt_" + lng, QLibraryInfo::location(QLibraryInfo::TranslationsPath)))
                qApp->installTranslator(qtTranslator);
        else {
                // No luck. Let's try to load a bundled one.
                if (qtTranslator->load("qt_" + lng, PATH_L10N)) {
                        // We have a translation in the localization direcotry.
                        qApp->installTranslator(qtTranslator);
                } else if (qtTranslator->load("qt_" + lng, ":/l10n")) {
                        // We have a translation "built-in" into application resources.
                        qApp->installTranslator(qtTranslator);
                } else {
                        // Qt library translation unavailable for this language.
                        delete qtTranslator;
                        qtTranslator = NULL;
                }
        }

        // Now let's load application translation.
        translator = new QTranslator(this);
        if (translator->load("tspsg_" + lng, PATH_L10N)) {
                // We have a translation in the localization directory.
                qApp->installTranslator(translator);
        } else if (translator->load("tspsg_" + lng, ":/l10n")) {
                // We have a translation "built-in" into application resources.
                qApp->installTranslator(translator);
        } else {
                delete translator;
                translator = NULL;
                if (!ad) {
                        settings->remove("Language");
                        QApplication::setOverrideCursor(QCursor(Qt::ArrowCursor));
                        QMessageBox::warning(isVisible() ? this : NULL, tr("Language Change"), tr("Unable to load the translation language.\nFalling back to autodetection."));
                        QApplication::restoreOverrideCursor();
                }
                return false;
        }
        return true;
}

void MainWindow::loadStyleList()
{
        menuSettingsStyle->clear();
QStringList styles = QStyleFactory::keys();
        menuSettingsStyle->insertAction(NULL, actionSettingsStyleSystem);
        actionSettingsStyleSystem->setChecked(!settings->contains("Style"));
        menuSettingsStyle->addSeparator();
QAction *a;
        foreach (QString style, styles) {
                a = menuSettingsStyle->addAction(style);
                a->setData(false);
                a->setStatusTip(tr("Set application style to %1").arg(style));
                a->setCheckable(true);
                a->setActionGroup(groupSettingsStyleList);
                if ((style == settings->value("Style").toString())
                        || QString(QApplication::style()->metaObject()->className()).contains(QRegExp(QString("^Q?%1(Style)?$").arg(QRegExp::escape(style)), Qt::CaseInsensitive))) {
                        a->setChecked(true);
                }
        }
}

void MainWindow::loadToolbarList()
{
        menuSettingsToolbars->clear();
#ifndef HANDHELD
        menuSettingsToolbars->insertAction(NULL, actionSettingsToolbarsConfigure);
        menuSettingsToolbars->addSeparator();
QList<QToolBar *> list = toolBarManager->toolBars();
        foreach (QToolBar *t, list) {
                menuSettingsToolbars->insertAction(NULL, t->toggleViewAction());
        }
#else // HANDHELD
        menuSettingsToolbars->insertAction(NULL, toolBarMain->toggleViewAction());
#endif // HANDHELD
}

bool MainWindow::maybeSave()
{
        if (!isWindowModified())
                return true;
int res = QMessageBox::warning(this, tr("Unsaved Changes"), tr("Would you like to save changes in the current task?"), QMessageBox::Save | QMessageBox::Discard | QMessageBox::Cancel);
        if (res == QMessageBox::Save)
                return actionFileSaveTriggered();
        else if (res == QMessageBox::Cancel)
                return false;
        else
                return true;
}

void MainWindow::outputMatrix(QTextCursor &cur, const TMatrix &matrix)
{
int n = spinCities->value();
QTextTable *table = cur.insertTable(n, n, fmt_table);

        for (int r = 0; r < n; r++) {
                for (int c = 0; c < n; c++) {
                        cur = table->cellAt(r, c).firstCursorPosition();
                        cur.setBlockFormat(fmt_cell);
                        cur.setBlockCharFormat(fmt_default);
                        if (matrix.at(r).at(c) == INFINITY)
                                cur.insertText(INFSTR);
                        else
                                cur.insertText(isInteger(matrix.at(r).at(c)) ? QString("%1").arg(matrix.at(r).at(c)) : QString("%1").arg(matrix.at(r).at(c), 0, 'f', settings->value("Task/FractionalAccuracy", DEF_FRACTIONAL_ACCURACY).toInt()));
                }
                QApplication::processEvents();
        }
        cur.movePosition(QTextCursor::End);
}

void MainWindow::outputMatrix(QTextCursor &cur, const SStep &step)
{
int n = spinCities->value();
QTextTable *table = cur.insertTable(n, n, fmt_table);

        for (int r = 0; r < n; r++) {
                for (int c = 0; c < n; c++) {
                        cur = table->cellAt(r, c).firstCursorPosition();
                        cur.setBlockFormat(fmt_cell);
                        if (step.matrix.at(r).at(c) == INFINITY)
                                cur.insertText(INFSTR, fmt_default);
                        else if ((r == step.candidate.nRow) && (c == step.candidate.nCol))
                                cur.insertText(isInteger(step.matrix.at(r).at(c)) ? QString("%1").arg(step.matrix.at(r).at(c)) : QString("%1").arg(step.matrix.at(r).at(c), 0, 'f', settings->value("Task/FractionalAccuracy", DEF_FRACTIONAL_ACCURACY).toInt()), fmt_selected);
                        else {
SStep::SCandidate cand;
                                cand.nRow = r;
                                cand.nCol = c;
                                if (step.alts.contains(cand))
                                        cur.insertText(isInteger(step.matrix.at(r).at(c)) ? QString("%1").arg(step.matrix.at(r).at(c)) : QString("%1").arg(step.matrix.at(r).at(c), 0, 'f', settings->value("Task/FractionalAccuracy", DEF_FRACTIONAL_ACCURACY).toInt()), fmt_alternate);
                                else
                                        cur.insertText(isInteger(step.matrix.at(r).at(c)) ? QString("%1").arg(step.matrix.at(r).at(c)) : QString("%1").arg(step.matrix.at(r).at(c), 0, 'f', settings->value("Task/FractionalAccuracy", DEF_FRACTIONAL_ACCURACY).toInt()), fmt_default);
                        }
                }
                QApplication::processEvents();
        }

        cur.movePosition(QTextCursor::End);
}

void MainWindow::retranslateUi(bool all)
{
        if (all)
                Ui::MainWindow::retranslateUi(this);

        loadStyleList();
        loadToolbarList();

#ifndef QT_NO_PRINTER
        actionFilePrintPreview->setText(tr("P&rint Preview..."));
#ifndef QT_NO_TOOLTIP
        actionFilePrintPreview->setToolTip(tr("Preview solution results"));
#endif // QT_NO_TOOLTIP
#ifndef QT_NO_STATUSTIP
        actionFilePrintPreview->setStatusTip(tr("Preview current solution results before printing"));
#endif // QT_NO_STATUSTIP

        actionFilePrint->setText(tr("&Print..."));
#ifndef QT_NO_TOOLTIP
        actionFilePrint->setToolTip(tr("Print solution"));
#endif // QT_NO_TOOLTIP
#ifndef QT_NO_STATUSTIP
        actionFilePrint->setStatusTip(tr("Print current solution results"));
#endif // QT_NO_STATUSTIP
        actionFilePrint->setShortcut(tr("Ctrl+P"));
#endif // QT_NO_PRINTER

#ifndef HANDHELD
        actionSettingsToolbarsConfigure->setText(tr("Configure..."));
#ifndef QT_NO_STATUSTIP
        actionSettingsToolbarsConfigure->setStatusTip(tr("Customize toolbars"));
#endif // QT_NO_STATUSTIP
#endif // HANDHELD

#ifdef Q_OS_WIN32
        actionHelpCheck4Updates->setText(tr("Check for &Updates..."));
#ifndef QT_NO_STATUSTIP
        actionHelpCheck4Updates->setStatusTip(tr("Check for %1 updates").arg(QApplication::applicationName()));
#endif // QT_NO_STATUSTIP
#endif // Q_OS_WIN32
}

bool MainWindow::saveTask() {
QStringList filters(tr("%1 Task File").arg("TSPSG") + " (*.tspt)");
        filters.append(tr("All Files") + " (*)");
QString file;
        if ((fileName == tr("Untitled") + ".tspt") && settings->value("SaveLastUsed", DEF_SAVE_LAST_USED).toBool()) {
                file = settings->value("LastUsed/TaskSavePath").toString();
                if (!file.isEmpty())
                        file.append("/");
                file.append(fileName);
        } else if (fileName.endsWith(".tspt", Qt::CaseInsensitive))
                file = fileName;
        else
                file = QFileInfo(fileName).path() + "/" + QFileInfo(fileName).completeBaseName() + ".tspt";

QFileDialog::Options opts = settings->value("UseNativeDialogs", DEF_USE_NATIVE_DIALOGS).toBool() ? QFileDialog::Options() : QFileDialog::DontUseNativeDialog;
        file = QFileDialog::getSaveFileName(this, tr("Task Save"), file, filters.join(";;"), NULL, opts);
        if (file.isEmpty())
                return false;
        else if (settings->value("SaveLastUsed", DEF_SAVE_LAST_USED).toBool())
                settings->setValue("LastUsed/TaskSavePath", QFileInfo(file).path());

        if (tspmodel->saveTask(file)) {
                setFileName(file);
                setWindowModified(false);
                return true;
        }
        return false;
}

void MainWindow::setFileName(const QString &fileName)
{
        this->fileName = fileName;
        setWindowTitle(QString("%1[*] - %2").arg(QFileInfo(fileName).completeBaseName()).arg(QApplication::applicationName()));
}

void MainWindow::setupUi()
{
        Ui::MainWindow::setupUi(this);

        // File Menu
        actionFileNew->setIcon(QIcon::fromTheme("document-new", QIcon(":/images/icons/document-new.png")));
        actionFileOpen->setIcon(QIcon::fromTheme("document-open", QIcon(":/images/icons/document-open.png")));
        actionFileSave->setIcon(QIcon::fromTheme("document-save", QIcon(":/images/icons/document-save.png")));
        menuFileSaveAs->setIcon(QIcon::fromTheme("document-save-as", QIcon(":/images/icons/document-save-as.png")));
        actionFileExit->setIcon(QIcon::fromTheme("application-exit", QIcon(":/images/icons/application-exit.png")));
        // Settings Menu
        menuSettingsLanguage->setIcon(QIcon::fromTheme("preferences-desktop-locale", QIcon(":/images/icons/preferences-desktop-locale.png")));
        actionSettingsLanguageEnglish->setIcon(QIcon::fromTheme("flag-gb", QIcon(":/images/icons/l10n/flag-gb.png")));
        menuSettingsStyle->setIcon(QIcon::fromTheme("preferences-desktop-theme", QIcon(":/images/icons/preferences-desktop-theme.png")));
        actionSettingsPreferences->setIcon(QIcon::fromTheme("preferences-system", QIcon(":/images/icons/preferences-system.png")));
        // Help Menu
        actionHelpContents->setIcon(QIcon::fromTheme("help-contents", QIcon(":/images/icons/help-contents.png")));
        actionHelpContextual->setIcon(QIcon::fromTheme("help-contextual", QIcon(":/images/icons/help-contextual.png")));
        actionHelpAbout->setIcon(QIcon::fromTheme("help-about", QIcon(":/images/icons/help-about.png")));
        // Buttons
        buttonRandom->setIcon(QIcon::fromTheme("roll", QIcon(":/images/icons/roll.png")));
        buttonSolve->setIcon(QIcon::fromTheme("dialog-ok", QIcon(":/images/icons/dialog-ok.png")));
        buttonSaveSolution->setIcon(QIcon::fromTheme("document-save-as", QIcon(":/images/icons/document-save-as.png")));
        buttonBackToTask->setIcon(QIcon::fromTheme("go-previous", QIcon(":/images/icons/go-previous.png")));

//      action->setIcon(QIcon::fromTheme("", QIcon(":/images/icons/.png")));

#if QT_VERSION >= 0x040600
        setToolButtonStyle(Qt::ToolButtonFollowStyle);
#endif

#ifndef HANDHELD
QStatusBar *statusbar = new QStatusBar(this);
        statusbar->setObjectName("statusbar");
        setStatusBar(statusbar);
#endif // HANDHELD

#ifdef Q_OS_WINCE_WM
        menuBar()->setDefaultAction(menuFile->menuAction());

QScrollArea *scrollArea = new QScrollArea(this);
        scrollArea->setFrameShape(QFrame::NoFrame);
        scrollArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
        scrollArea->setWidgetResizable(true);
        scrollArea->setWidget(tabWidget);
        setCentralWidget(scrollArea);
#else
        setCentralWidget(tabWidget);
#endif // Q_OS_WINCE_WM

        //! \hack HACK: A little hack for toolbar icons to have a sane size.
#ifdef HANDHELD
        toolBarMain->setIconSize(QSize(logicalDpiX() / 4, logicalDpiY() / 4));
#endif // HANDHELD
QToolButton *tb = static_cast<QToolButton *>(toolBarMain->widgetForAction(actionFileSave));
        if (tb != NULL)  {
                tb->setMenu(menuFileSaveAs);
                tb->setPopupMode(QToolButton::MenuButtonPopup);
        }

//      solutionText->document()->setDefaultFont(settings->value("Output/Font", QFont(DEF_FONT_FAMILY, DEF_FONT_SIZE)).value<QFont>());
        solutionText->setWordWrapMode(QTextOption::WordWrap);

#ifndef QT_NO_PRINTER
        actionFilePrintPreview = new QAction(this);
        actionFilePrintPreview->setObjectName("actionFilePrintPreview");
        actionFilePrintPreview->setEnabled(false);
        actionFilePrintPreview->setIcon(QIcon::fromTheme("document-print-preview", QIcon(":/images/icons/document-print-preview.png")));

        actionFilePrint = new QAction(this);
        actionFilePrint->setObjectName("actionFilePrint");
        actionFilePrint->setEnabled(false);
        actionFilePrint->setIcon(QIcon::fromTheme("document-print", QIcon(":/images/icons/document-print.png")));

        menuFile->insertAction(actionFileExit,actionFilePrintPreview);
        menuFile->insertAction(actionFileExit,actionFilePrint);
        menuFile->insertSeparator(actionFileExit);

        toolBarMain->insertAction(actionSettingsPreferences, actionFilePrint);
#endif // QT_NO_PRINTER

        groupSettingsLanguageList = new QActionGroup(this);
        actionSettingsLanguageEnglish->setData("en");
        actionSettingsLanguageEnglish->setActionGroup(groupSettingsLanguageList);
        loadLangList();
        actionSettingsLanguageAutodetect->setChecked(settings->value("Language", "").toString().isEmpty());

        actionSettingsStyleSystem->setData(true);
        groupSettingsStyleList = new QActionGroup(this);

#ifndef HANDHELD
        actionSettingsToolbarsConfigure = new QAction(this);
        actionSettingsToolbarsConfigure->setIcon(QIcon::fromTheme("configure-toolbars", QIcon(":/images/icons/configure-toolbars.png")));
#endif // HANDHELD

#ifdef Q_OS_WIN32
        actionHelpCheck4Updates = new QAction(this);
        actionHelpCheck4Updates->setIcon(QIcon::fromTheme("system-software-update", QIcon(":/images/icons/system-software-update.png")));
        actionHelpCheck4Updates->setEnabled(hasUpdater());
        menuHelp->insertAction(actionHelpAboutQt, actionHelpCheck4Updates);
        menuHelp->insertSeparator(actionHelpAboutQt);
#endif // Q_OS_WIN32

        spinCities->setMaximum(MAX_NUM_CITIES);

#ifndef HANDHELD
        toolBarManager = new QtToolBarManager;
        toolBarManager->setMainWindow(this);
QString cat = toolBarMain->windowTitle();
        toolBarManager->addToolBar(toolBarMain, cat);
#ifndef QT_NO_PRINTER
        toolBarManager->addAction(actionFilePrintPreview, cat);
#endif // QT_NO_PRINTER
        toolBarManager->addAction(actionHelpContents, cat);
        toolBarManager->addAction(actionHelpContextual, cat);
//      toolBarManager->addAction(action, cat);
        toolBarManager->restoreState(settings->value("MainWindow/Toolbars").toByteArray());
#endif // HANDHELD

        retranslateUi(false);

#ifdef Q_OS_WIN32
        // Adding some eyecandy in Vista and 7 :-)
        if (QtWin::isCompositionEnabled() && settings->value("UseTranslucency", DEF_USE_TRANSLUCENCY).toBool())  {
                toggleTranclucency(true);
        }
#endif // Q_OS_WIN32
}

void MainWindow::toggleSolutionActions(bool enable)
{
        buttonSaveSolution->setEnabled(enable);
        actionFileSaveAsSolution->setEnabled(enable);
        solutionText->setEnabled(enable);
#ifndef QT_NO_PRINTER
        actionFilePrint->setEnabled(enable);
        actionFilePrintPreview->setEnabled(enable);
#endif // QT_NO_PRINTER
}

void MainWindow::toggleTranclucency(bool enable)
{
#ifdef Q_OS_WIN32
        toggleStyle(labelVariant, enable);
        toggleStyle(labelCities, enable);
        toggleStyle(statusBar(), enable);
        tabWidget->setDocumentMode(enable);
        QtWin::enableBlurBehindWindow(this, enable);
#else
        Q_UNUSED(enable);
#endif // Q_OS_WIN32
}