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** This file is part of the demonstration applications of the Qt Toolkit.

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****************************************************************************/

#include "mainwindow.h"

#include "menumanager.h"

#include "colors.h"

#include "dockitem.h"

#include "demotextitem.h"

#include "imageitem.h"

#include "demoitem.h"

#include "demoscene.h"

#ifndef QT_NO_OPENGL

    #include <QGLWidget>

#endif

//#define QT_NO_OPENGL

MainWindow::MainWindow(QWidget *parent) : QGraphicsView(parent), updateTimer(this)

{

    this->currentFps = Colors::fps;

    this->loop = false;

    this->fpsMedian = -1;

    this->fpsLabel = 0;

    this->pausedLabel = 0;

    this->doneAdapt = false;

    this->useTimer = false;

    this->updateTimer.setSingleShot(true);

    this->companyLogo = 0;

    this->qtLogo = 0;

    this->setupWidget();

    this->setupScene();

    this->setupSceneItems();

    this->drawBackgroundToPixmap();

}

MainWindow::~MainWindow()

{

    delete this->companyLogo;

    delete this->qtLogo;

}

void MainWindow::setupWidget()

{

    QRect screenRect = QApplication::desktop()->screenGeometry(QApplication::desktop()->primaryScreen());

    QRect windowRect(0, 0, 800, 600);

    if (screenRect.width() < 800)

        windowRect.setWidth(screenRect.width());

    if (screenRect.height() < 600)

        windowRect.setHeight(screenRect.height());

    windowRect.moveCenter(screenRect.center());

    this->setGeometry(windowRect);

    this->setMinimumSize(80, 60);

    setWindowTitle(tr("Qt Examples and Demos"));

    setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);

    setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);

    setFrameStyle(QFrame::NoFrame);

    this->setRenderingSystem();

    connect(&this->updateTimer, SIGNAL(timeout()), this, SLOT(tick()));

}

void MainWindow::setRenderingSystem()

{

    QWidget *viewport = 0;

#ifndef QT_NO_OPENGL

    if (Colors::openGlRendering) {

        QGLWidget *glw = new QGLWidget(QGLFormat(QGL::SampleBuffers));

        if (Colors::noScreenSync)

            glw->format().setSwapInterval(0);

        glw->setAutoFillBackground(false);

        viewport = glw;

        setCacheMode(QGraphicsView::CacheNone);

        if (Colors::verbose)

            qDebug() << "- using OpenGL";

    } else // software rendering

#endif

    {

        // software rendering

        viewport = new QWidget;

        setCacheMode(QGraphicsView::CacheBackground);

        if (Colors::verbose)

            qDebug() << "- using software rendering";

    }

    setViewport(viewport);

}

void MainWindow::start()

{

    this->switchTimerOnOff(true);

    this->demoStartTime.restart();

    MenuManager::instance()->itemSelected(MenuManager::ROOT, Colors::rootMenuName);

    if (Colors::verbose)

        qDebug("- starting demo");

}

void MainWindow::enableMask(bool enable)

{

    if (!enable || Colors::noWindowMask)

        this->clearMask();

    else {

        QPolygon region;

        region.setPoints(9,

                                // north side:

                                0, 0,

                                800, 0,

                                // east side:

                                // 800, 70,

                                // 790, 90,

                                // 790, 480,

                                // 800, 500,

                                800, 600,

                                // south side:

                                700, 600,

                                670, 590,

                                130, 590,

                                100, 600,

                                0, 600,

                                // west side:

                                // 0, 550,

                                // 10, 530,

                                // 10, 520,

                                // 0, 520,

                                0, 0);

        this->setMask(QRegion(region));

    }

}

void MainWindow::setupScene()

{

    this->scene = new DemoScene(this);

    this->scene->setSceneRect(0, 0, 800, 600);

    setScene(this->scene);

    this->scene->setItemIndexMethod(QGraphicsScene::NoIndex);

}

void MainWindow::drawItems(QPainter *painter, int numItems, QGraphicsItem **items, const QStyleOptionGraphicsItem* options)

{

    QGraphicsView::drawItems(painter, numItems, items, options);

}

void MainWindow::switchTimerOnOff(bool on)

{

    bool ticker = MenuManager::instance()->ticker && MenuManager::instance()->ticker->scene();

    if (ticker)

        MenuManager::instance()->ticker->tickOnPaint = !on || Colors::noTimerUpdate;

    if (on && !Colors::noTimerUpdate){

        this->useTimer = true;

        this->setViewportUpdateMode(QGraphicsView::NoViewportUpdate);

        this->fpsTime = QTime::currentTime();

        this->updateTimer.start(int(1000 / Colors::fps));

    }

    else{

        this->useTimer = false;

        this->updateTimer.stop();

        if (Colors::softwareRendering)

            if (Colors::noTicker)

                this->setViewportUpdateMode(QGraphicsView::MinimalViewportUpdate);

            else

                this->setViewportUpdateMode(QGraphicsView::SmartViewportUpdate);

        else

            this->setViewportUpdateMode(QGraphicsView::FullViewportUpdate);

    }

}

bool MainWindow::measureFps()

{

    // Calculate time diff:

    float t = this->fpsTime.msecsTo(QTime::currentTime());

    if (t == 0)

        t = 0.01f;

    this->currentFps = (1000.0f / t);

    this->fpsHistory += this->currentFps;

    this->fpsTime = QTime::currentTime();

    // Calculate median:

    int size = this->fpsHistory.size();

    if (size == 10){

        qSort(this->fpsHistory.begin(), this->fpsHistory.end());

        this->fpsMedian = this->fpsHistory.at(int(size/2));

        if (this->fpsMedian == 0)

            this->fpsMedian = 0.01f;

        this->fpsHistory.clear();

        return true;

    }

    return false;

}

/**

    Used for adaption in case things are so slow

    that no median  yet has been calculated

*/

void MainWindow::forceFpsMedianCalculation()

{

    if (this->fpsMedian != -1)

        return;

    int size = this->fpsHistory.size();

    if (size == 0){

        this->fpsMedian = 0.01f;

        return;

    }

    qSort(this->fpsHistory.begin(), this->fpsHistory.end());

    this->fpsMedian = this->fpsHistory.at(int(size/2));

    if (this->fpsMedian == 0)

        this->fpsMedian = 0.01f;

}

void MainWindow::tick()

{

    bool medianChanged = this->measureFps();

    this->checkAdapt();

    if (medianChanged && this->fpsLabel && Colors::showFps)

        this->fpsLabel->setText(QString("FPS: ") + QString::number(int(this->currentFps)));

    if (MenuManager::instance()->ticker)

        MenuManager::instance()->ticker->tick();

    this->viewport()->update();

    if (this->useTimer)

        this->updateTimer.start(int(1000 / Colors::fps));

}

void MainWindow::setupSceneItems()

{

    if (Colors::showFps){

        this->fpsLabel = new DemoTextItem(QString("FPS: --"), Colors::buttonFont(), Qt::white, -1, this->scene, 0, DemoTextItem::DYNAMIC_TEXT);

        this->fpsLabel->setZValue(100);

        this->fpsLabel->setPos(Colors::stageStartX, 600 - QFontMetricsF(Colors::buttonFont()).height() - 5);

    }

    this->companyLogo = new ImageItem(QImage(":/images/trolltech-logo.png"), 1000, 1000, this->scene, 0, true, 0.5f);

    this->qtLogo = new ImageItem(QImage(":/images/qtlogo_small.png"), 1000, 1000, this->scene, 0, true, 0.5f);

    this->companyLogo->setZValue(100);

    this->qtLogo->setZValue(100);

    this->pausedLabel = new DemoTextItem(QString("PAUSED"), Colors::buttonFont(), Qt::white, -1, this->scene, 0);

    this->pausedLabel->setZValue(100);

    QFontMetricsF fm(Colors::buttonFont());

    this->pausedLabel->setPos(Colors::stageWidth - fm.width("PAUSED"), 590 - fm.height());

    this->pausedLabel->setRecursiveVisible(false);

}

void MainWindow::checkAdapt()

{

    if (this->doneAdapt

        || Colors::noTimerUpdate

        || this->demoStartTime.elapsed() < 2000)

       return;

    this->doneAdapt = true;

    this->forceFpsMedianCalculation();

    Colors::benchmarkFps = this->fpsMedian;

    if (Colors::verbose)

        qDebug() << "- benchmark:" << QString::number(Colors::benchmarkFps) << "FPS";

    if (Colors::noAdapt)

        return;

    if (this->fpsMedian < 30){

        if (MenuManager::instance()->ticker && MenuManager::instance()->ticker->scene()){

            this->scene->removeItem(MenuManager::instance()->ticker);

            Colors::noTimerUpdate = true;

            this->switchTimerOnOff(false);

            if (this->fpsLabel)

               this->fpsLabel->setText(QString("FPS: (") + QString::number(this->fpsMedian) + QString(")"));

            if (Colors::verbose)

               qDebug() << "- benchmark adaption: removed ticker (fps < 30)";

        }

        if (this->fpsMedian < 20){

            Colors::noAnimations = true;

            if (Colors::verbose)

               qDebug() << "- benchmark adaption: animations switched off (fps < 20)";

        }

        Colors::adapted = true;

    }

}

int MainWindow::performBenchmark()

{

/*

    QTime time;

    time.restart();

    while (time.elapsed() < 2000)

        QCoreApplication::processEvents(QEventLoop::AllEvents, 50);

*/

    return 0;

}

void MainWindow::drawBackgroundToPixmap()

{

    const QRectF r = this->scene->sceneRect();

    this->background = QPixmap(qRound(r.width()), qRound(r.height()));

    this->background.fill(Qt::black);

    QPainter painter(&this->background);

    if (false && Colors::useEightBitPalette){

        painter.fillRect(r, Colors::sceneBg1);

    } else {

        QImage bg(":/images/demobg.png");

        painter.drawImage(0, 0, bg);

    }

}

void MainWindow::drawBackground(QPainter *painter, const QRectF &rect)

{

    Q_UNUSED(rect);

    painter->drawPixmap(QPoint(0, 0), this->background);

}

void MainWindow::showEvent(QShowEvent * event)

{

    Q_UNUSED(event);

    QGraphicsView::showEvent(event);

}

void MainWindow::toggleFullscreen()

{

    if (this->isFullScreen()){

        this->enableMask(true);

        this->showNormal();

        if (MenuManager::instance()->ticker)

            MenuManager::instance()->ticker->pause(false);

    }

    else {

        this->enableMask(false);

        this->showFullScreen();

    }

}

void MainWindow::keyPressEvent(QKeyEvent *event)

{

    if (event->key() == Qt::Key_Escape){

        this->loop = false;

        QApplication::quit();

    }

    else if (event->key() == Qt::Key_1){

            QString s("");

            s += "Rendering system: ";

            if (Colors::openGlRendering)

                s += "OpenGL";

            else

                s += "software";

            s += "\nAdapt: ";

            s += Colors::noAdapt ? "off" : "on";

            s += "\nAdaption occured: ";

            s += Colors::adapted ? "yes" : "no";

            s += "\nOpenGL version: ";

            s += Colors::glVersion;

            QWidget w;

            s += "\nColor bit depth: ";

            s += QString::number(w.depth());

            s += "\nWanted FPS: ";

            s += QString::number(Colors::fps);

            s += "\nBenchmarked FPS: ";

            s += Colors::benchmarkFps != -1 ? QString::number(Colors::benchmarkFps) : "not calculated";

            s += "\nAnimations: ";

            s += Colors::noAnimations ? "off" : "on";

            s += "\nBlending: ";

            s += Colors::useEightBitPalette ? "off" : "on";

            s += "\nTicker: ";

            s += Colors::noTicker ? "off" : "on";

            s += "\nPixmaps: ";

            s += Colors::usePixmaps ? "on" : "off";

            s += "\nRescale images on resize: ";

            s += Colors::noRescale ? "off" : "on";

            s += "\nTimer based updates: ";

            s += Colors::noTimerUpdate ? "off" : "on";

            s += "\nSeparate loop: ";

            s += Colors::useLoop ? "yes" : "no";

            s += "\nScreen sync: ";

            s += Colors::noScreenSync ? "no" : "yes";

            QMessageBox::information(0, QString("Current configuration"), s);

    }

}

void MainWindow::focusInEvent(QFocusEvent *)

{

    if (!Colors::pause)

        return;

    if (MenuManager::instance()->ticker)

        MenuManager::instance()->ticker->pause(false);

    int code = MenuManager::instance()->currentMenuCode;

    if (code == MenuManager::ROOT || code == MenuManager::MENU1)

        this->switchTimerOnOff(true);

    this->pausedLabel->setRecursiveVisible(false);

}

void MainWindow::focusOutEvent(QFocusEvent *)

{

    if (!Colors::pause)

        return;

    if (MenuManager::instance()->ticker)

        MenuManager::instance()->ticker->pause(true);

    int code = MenuManager::instance()->currentMenuCode;

    if (code == MenuManager::ROOT || code == MenuManager::MENU1)

        this->switchTimerOnOff(false);

    this->pausedLabel->setRecursiveVisible(true);

}

void MainWindow::resizeEvent(QResizeEvent *event)

{

    Q_UNUSED(event);

    this->resetMatrix();

    this->scale(event->size().width() / 800.0, event->size().height() / 600.0);

    QGraphicsView::resizeEvent(event);

    DemoItem::setMatrix(this->matrix());

    if (this->companyLogo){

        const QRectF r = this->scene->sceneRect();

        QRectF ttb = this->companyLogo->boundingRect();

        this->companyLogo->setPos(int((r.width() - ttb.width()) / 2), 595 - ttb.height());

        QRectF qtb = this->qtLogo->boundingRect();

        this->qtLogo->setPos(802 - qtb.width(), 0);

    }

    // Changing size will almost always

    // hurt FPS during the changing. So

    // ignore it.

    this->fpsHistory.clear();

}