/*
 *  TSPSG: TSP Solver and Generator
 *  Copyright (C) 2007-2011 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_WS_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_WS_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_WS_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()));
    if (actionHelpCheck4Updates != NULL)
        connect(actionHelpCheck4Updates, SIGNAL(triggered()), SLOT(actionHelpCheck4UpdatesTriggered()));
    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(actionHelpOnlineSupport, SIGNAL(triggered()), SLOT(actionHelpOnlineSupportTriggered()));
    connect(actionHelpReportBug, SIGNAL(triggered()), SLOT(actionHelpReportBugTriggered()));
    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);

    if (actionHelpCheck4Updates != NULL) {
        if (!settings->contains("Check4Updates/Enabled")) {
            QApplication::setOverrideCursor(QCursor(Qt::ArrowCursor));
            settings->setValue("Check4Updates/Enabled",
                QMessageBox::question(this, QCoreApplication::applicationName(),
                    tr("Would you like %1 to automatically check for updates every %n day(s)?", "", settings->value("Check4Updates/Interval", DEF_UPDATE_CHECK_INTERVAL).toInt()).arg(QCoreApplication::applicationName()),
                    QMessageBox::Yes | QMessageBox::No
                ) == QMessageBox::Yes
            );
            QApplication::restoreOverrideCursor();
        }
        if ((settings->value("Check4Updates/Enabled", DEF_CHECK_FOR_UPDATES).toBool())
            && (QDate(qvariant_cast<QDate>(settings->value("Check4Updates/LastAttempt"))).daysTo(QDate::currentDate()) >= settings->value("Check4Updates/Interval", DEF_UPDATE_CHECK_INTERVAL).toInt())) {
            check4Updates(true);
        }
    }
}

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(OS"/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(OS"/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(OS"/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)");
    filters.append(tr("OpenDocument Files") + " (*.odt)");
    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(OS"/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)
    if (!QImageWriter::supportedImageFormats().contains(format.toAscii()) && (format != "svg")) {
#else // NOSVG
    if (!QImageWriter::supportedImageFormats().contains(format.toAscii())) {
#endif // NOSVG
        format = DEF_GRAPH_IMAGE_FORMAT;
        settings->remove("Output/GraphImageFormat");
    }
QString html = solutionText->document()->toHtml("UTF-8"),
        img =  fi.completeBaseName() + "." + format;
        html.replace(QRegExp("font-family:([^;]*);"), "font-family:\\1, 'DejaVu Sans Mono', 'Courier New', Courier, monospace;");
        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)
        if (format == "svg") {
QSvgGenerator svg;
            svg.setSize(QSize(graph.width() + 2, graph.height() + 2));
            svg.setResolution(graph.logicalDpiX());
            svg.setFileName(fi.path() + "/" + img);
            svg.setTitle(tr("Solution Graph"));
            svg.setDescription(tr("Generated with %1").arg(QCoreApplication::applicationName()));
QPainter p;
            p.begin(&svg);
            p.drawPicture(1, 1, graph);
            p.end();
        } else {
#endif // NOSVG
QImage i(graph.width() + 2, graph.height() + 2, 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", QCoreApplication::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)
        }
#endif // NOSVG
    } 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()));
    }
    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(QCoreApplication::applicationName()));
    } else
        settings->setValue("Language", groupSettingsLanguageList->checkedAction()->data().toString());
}

void MainWindow::groupSettingsLanguageListTriggered(QAction *action)
{
#ifndef Q_WS_MAEMO_5
    if (actionSettingsLanguageAutodetect->isChecked())
        actionSettingsLanguageAutodetect->trigger();
#endif
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();
#ifndef HANDHELD
        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(QCoreApplication::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

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;
    }

    check4Updates();
}

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

QString title;
    title += QString("<b>%1</b><br>").arg(QCoreApplication::applicationName());
    title += QString("%1: <b>%2</b><br>").arg(tr("Version"), QCoreApplication::applicationVersion());
#ifndef HANDHELD
    title += QString("<b>&copy; 2007-%1 <a href=\"http://%2/\">%3</a></b><br>").arg(QDate::currentDate().toString("yyyy"), QCoreApplication::organizationDomain(), QCoreApplication::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)"), PLATFROM);
#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> with <b>%4</b> compiler.").arg(BUILD_NUMBER).arg(__DATE__).arg(__TIME__).arg(COMPILER) + "<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><br>\n"
        "<br>\n"
        "%1 comes with the default \"embedded\" font <b>DejaVu&nbsp;LGC&nbsp;Sans&nbsp;"
        "Mono</b> from the <b>DejaVu fonts</b> licensed under a Free license</a>,<br>\n"
        "see <a href=\"http://dejavu-fonts.org/\">dejavu-fonts.org</a>")
            .arg("TSPSG");

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

QString translation = QCoreApplication::translate("--------", "AUTHORS %1", "Please, provide translator credits here. %1 will be replaced with VERSION");
    if ((translation != "AUTHORS %1") && (translation.contains("%1"))) {
QString about = QCoreApplication::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"), QCoreApplication::organizationDomain(), QCoreApplication::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(GET_ICON("dialog-ok"));

    hb2->addWidget(bb);

#ifdef Q_WS_WINCE_WM
    vb->setMargin(3);
#endif // Q_WS_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(QCoreApplication::applicationName()));
    dlg->setWindowIcon(GET_ICON("help-about"));
    dlg->setLayout(vb);

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

#ifndef HANDHELD
    // Adding some eyecandy
    if (QtWin::isCompositionEnabled())  {
        QtWin::enableBlurBehindWindow(dlg, true);
    }
#endif // HANDHELD

#ifndef HANDHELD
    dlg->resize(450, 350);
#endif
    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(GET_ICON("dialog-cancel"));
    cancel->setText(QCoreApplication::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_WS_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_WS_WIN32
    if (tl != NULL)
        connect(&solver, SIGNAL(routePartFound(int)), SLOT(solverRoutePartFound(int)));
#endif
SStep *root = solver.solve(n, matrix);
#ifdef Q_WS_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_WS_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_WS_WIN32
        if (tl != NULL)
            tl->SetProgressState(winId(), TBPF_INDETERMINATE);
#endif
        QCoreApplication::processEvents(QEventLoop::ExcludeUserInputEvents);

#ifndef QT_NO_CONCURRENT
QFuture<void> f = QtConcurrent::run(&solver, &CTSPSolver::cleanup, false);
        while (!f.isFinished()) {
            QCoreApplication::processEvents(QEventLoop::ExcludeUserInputEvents);
        }
#else
        solver.cleanup(true);
#endif
        pd.reset();
#ifdef Q_WS_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_WS_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 = qvariant_cast<QFont>(settings->value("Output/Font", QFont(DEF_FONT_FACE, 9)));
        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();
            QCoreApplication::processEvents(QEventLoop::ExcludeUserInputEvents);
#ifdef Q_WS_WIN32
            if (tl != NULL)
                tl->SetProgressState(winId(), TBPF_INDETERMINATE);
#endif
#ifndef QT_NO_CONCURRENT
QFuture<void> f = QtConcurrent::run(&solver, &CTSPSolver::cleanup, false);
            while (!f.isFinished()) {
                QCoreApplication::processEvents(QEventLoop::ExcludeUserInputEvents);
            }
#else
            solver.cleanup(true);
#endif
            solutionText->clear();
            toggleSolutionActions(false);
#ifdef Q_WS_WIN32
            if (tl != NULL) {
                tl->SetProgressState(winId(), TBPF_NOPROGRESS);
                tl->Release();
                tl = NULL;
            }
#endif
            return;
        }
        pd.setValue(n);
#ifdef Q_WS_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_WS_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() + 2, graph.height() + 2, 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);
    QCoreApplication::processEvents(QEventLoop::ExcludeUserInputEvents);
#ifdef Q_WS_WIN32
    if (tl != NULL)
        tl->SetProgressState(winId(), TBPF_INDETERMINATE);
#endif
#ifndef QT_NO_CONCURRENT
QFuture<void> f = QtConcurrent::run(&solver, &CTSPSolver::cleanup, false);
    while (!f.isFinished()) {
        QCoreApplication::processEvents(QEventLoop::ExcludeUserInputEvents);
    }
#else
    solver.cleanup(true);
#endif
    toggleSolutionActions();
    tabWidget->setCurrentIndex(1);
#ifdef Q_WS_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_WS_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_WS_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_WS_WIN32
void MainWindow::solverRoutePartFound(int n)
{
    tl->SetProgressValue(winId(), n, spinCities->value() * 2);
}
#endif // Q_WS_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::check4Updates(bool silent)
{
#ifdef Q_WS_WIN32
    if (silent)
        QProcess::startDetached("updater/Update.exe -name=\"TSPSG: TSP Solver and Generator\" -check=\"freeupdate\" -silentcheck");
    else {
        QApplication::setOverrideCursor(QCursor(Qt::WaitCursor));
        QProcess::execute("updater/Update.exe -name=\"TSPSG: TSP Solver and Generator\" -check=\"freeupdate\"");
        QApplication::restoreOverrideCursor();
    }
#else
    Q_UNUSED(silent)
#endif
    settings->setValue("Check4Updates/LastAttempt", QDate::currentDate().toString(Qt::ISODate));
}

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();
        }
#else
        settings->setValue("MainWindow/ToolbarVisible", toolBarMain->isVisible());
#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();
    }
}

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

    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 = qvariant_cast<QColor>(settings->value("Text", DEF_TEXT_COLOR));
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(qvariant_cast<QColor>(settings->value("Selected", DEF_SELECTED_COLOR))));
    fmt_selected.setFontWeight(QFont::Bold);

    fmt_alternate.setForeground(QBrush(qvariant_cast<QColor>(settings->value("Alternate", DEF_ALTERNATE_COLOR))));
    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;
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(language.at(2)));

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

QAction *a;
    foreach (language, langlist) {
        a = menuSettingsLanguage->addAction(language.at(2));
#ifndef QT_NO_STATUSTIP
        a->setStatusTip(language.at(3));
#endif
#if QT_VERSION >= 0x040600
        a->setIcon(QIcon::fromTheme(QString("flag-%1").arg(language.at(1)), QIcon(QString(":/images/icons/l10n/flag-%1.png").arg(language.at(1)))));
#else
        a->setIcon(QIcon(QString(":/images/icons/l10n/flag-%1.png").arg(language.at(1))));
#endif
        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);
#ifndef QT_NO_STATUSTIP
        a->setStatusTip(tr("Set application style to %1").arg(style));
#endif
        a->setCheckable(true);
        a->setActionGroup(groupSettingsStyleList);
        if ((style == settings->value("Stlye").toString())
#ifndef Q_WS_MAEMO_5
            || QString(QApplication::style()->metaObject()->className()).contains(QRegExp(QString("^Q?%1(Style)?$").arg(QRegExp::escape(style)), Qt::CaseInsensitive))
#endif
        ) {
            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()));
        }
        QCoreApplication::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);
            }
        }
        QCoreApplication::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"));
    actionFileExit->setStatusTip(tr("Exit %1").arg(QCoreApplication::applicationName()));
#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

#ifndef QT_NO_STATUSTIP
    actionHelpReportBug->setStatusTip(tr("Report about a bug in %1").arg(QCoreApplication::applicationName()));
#endif // QT_NO_STATUSTIP
    if (actionHelpCheck4Updates != NULL) {
        actionHelpCheck4Updates->setText(tr("Check for &Updates..."));
#ifndef QT_NO_STATUSTIP
        actionHelpCheck4Updates->setStatusTip(tr("Check for %1 updates").arg(QCoreApplication::applicationName()));
#endif // QT_NO_STATUSTIP
    }
#ifndef QT_NO_STATUSTIP
    actionHelpAbout->setStatusTip(tr("About %1").arg(QCoreApplication::applicationName()));
#endif // QT_NO_STATUSTIP
}

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(OS"/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(OS"/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(QCoreApplication::applicationName()));
}

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

    // File Menu
    actionFileNew->setIcon(GET_ICON("document-new"));
    actionFileOpen->setIcon(GET_ICON("document-open"));
    actionFileSave->setIcon(GET_ICON("document-save"));
#ifndef HANDHELD
    menuFileSaveAs->setIcon(GET_ICON("document-save-as"));
#endif
    actionFileExit->setIcon(GET_ICON("application-exit"));
    // Settings Menu
#ifndef HANDHELD
    menuSettingsLanguage->setIcon(GET_ICON("preferences-desktop-locale"));
#if QT_VERSION >= 0x040600
    actionSettingsLanguageEnglish->setIcon(QIcon::fromTheme("flag-gb", QIcon(":/images/icons/l10n/flag-gb.png")));
#else // QT_VERSION >= 0x040600
    actionSettingsLanguageEnglish->setIcon(QIcon(":/images/icons/l10n/flag-gb.png"));
#endif // QT_VERSION >= 0x040600
    menuSettingsStyle->setIcon(GET_ICON("preferences-desktop-theme"));
#endif // HANDHELD
    actionSettingsPreferences->setIcon(GET_ICON("preferences-system"));
    // Help Menu
#ifndef HANDHELD
    actionHelpContents->setIcon(GET_ICON("help-contents"));
    actionHelpContextual->setIcon(GET_ICON("help-contextual"));
    actionHelpOnlineSupport->setIcon(GET_ICON("applications-internet"));
    actionHelpReportBug->setIcon(GET_ICON("tools-report-bug"));
    actionHelpAbout->setIcon(GET_ICON("help-about"));
    actionHelpAboutQt->setIcon(QIcon(":/images/icons/"ICON_SIZE"/qtlogo."ICON_FORMAT));
#endif
    // Buttons
    buttonRandom->setIcon(GET_ICON("roll"));
    buttonSolve->setIcon(GET_ICON("dialog-ok"));
    buttonSaveSolution->setIcon(GET_ICON("document-save-as"));
    buttonBackToTask->setIcon(GET_ICON("go-previous"));

//	action->setIcon(GET_ICON(""));

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

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

#ifdef Q_WS_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_WS_WINCE_WM

    //! \hack HACK: A little hack for toolbar icons to have a sane size.
#if defined(HANDHELD) && !defined(Q_WS_MAEMO_5)
#ifdef Q_WS_S60
    toolBarMain->setIconSize(QSize(logicalDpiX() / 5, logicalDpiY() / 5));
#else
    toolBarMain->setIconSize(QSize(logicalDpiX() / 4, logicalDpiY() / 4));
#endif // Q_WS_S60
#endif // HANDHELD && !Q_WS_MAEMO_5
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(GET_ICON("document-print-preview"));

    actionFilePrint = new QAction(this);
    actionFilePrint->setObjectName("actionFilePrint");
    actionFilePrint->setEnabled(false);
    actionFilePrint->setIcon(GET_ICON("document-print"));

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

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

    groupSettingsLanguageList = new QActionGroup(this);
#ifdef Q_WS_MAEMO_5
    groupSettingsLanguageList->addAction(actionSettingsLanguageAutodetect);
#endif
    actionSettingsLanguageEnglish->setData("en");
    actionSettingsLanguageEnglish->setActionGroup(groupSettingsLanguageList);
    loadLangList();
    actionSettingsLanguageAutodetect->setChecked(settings->value("Language", "").toString().isEmpty());

    actionSettingsStyleSystem->setData(true);
    groupSettingsStyleList = new QActionGroup(this);
#ifdef Q_WS_MAEMO_5
    groupSettingsStyleList->addAction(actionSettingsStyleSystem);
#endif

#ifndef HANDHELD
    actionSettingsToolbarsConfigure = new QAction(this);
    actionSettingsToolbarsConfigure->setIcon(GET_ICON("configure-toolbars"));
#endif // HANDHELD

    if (hasUpdater()) {
        actionHelpCheck4Updates = new QAction(this);
        actionHelpCheck4Updates->setIcon(GET_ICON("system-software-update"));
        actionHelpCheck4Updates->setEnabled(hasUpdater());
        menuHelp->insertAction(actionHelpAboutQt, actionHelpCheck4Updates);
        menuHelp->insertSeparator(actionHelpAboutQt);
    } else
        actionHelpCheck4Updates = NULL;

    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());
#else
    toolBarMain->setVisible(settings->value("MainWindow/ToolbarVisible", true).toBool());
#endif // HANDHELD

    retranslateUi(false);

#ifndef HANDHELD
    // Adding some eyecandy
    if (QtWin::isCompositionEnabled() && settings->value("UseTranslucency", DEF_USE_TRANSLUCENCY).toBool())  {
        toggleTranclucency(true);
    }
#endif // HANDHELD
}

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)
{
#ifndef HANDHELD
    toggleStyle(labelVariant, enable);
    toggleStyle(labelCities, enable);
    toggleStyle(statusBar(), enable);
    tabWidget->setDocumentMode(enable);
    QtWin::enableBlurBehindWindow(this, enable);
#else
    Q_UNUSED(enable);
#endif // HANDHELD
}

void MainWindow::actionHelpOnlineSupportTriggered()
{
    QDesktopServices::openUrl(QUrl("http://tspsg.info/goto/support"));
}

void MainWindow::actionHelpReportBugTriggered()
{
    QDesktopServices::openUrl(QUrl("http://tspsg.info/goto/bugtracker"));
}