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

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

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** contained in the Technology Preview License Agreement accompanying

** this package.

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

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

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

#include <QBasicTimer>

#include <QList>

#include <QImage>

#include <QDir>

#include <QPainter>

#include <QPaintEvent>

#include <QDebug>

#include "slideshow.h"

class SlideShowPrivate

{

public:

    SlideShowPrivate();

    int currentSlide;

    int slideInterval;

    QBasicTimer interSlideTimer;

    QStringList imagePaths;

    void showNextSlide();

};

SlideShowPrivate::SlideShowPrivate()

{

    currentSlide = 0;

    slideInterval = 10000; // Default to 10 sec interval

}

void SlideShowPrivate::showNextSlide()

{

    currentSlide++;

    if (currentSlide >= imagePaths.size())

      currentSlide = 0;

}

SlideShow::SlideShow(QWidget* parent) :

    QWidget(parent)

{

    d = new SlideShowPrivate;

    setAttribute(Qt::WA_StaticContents, true);

    setAttribute(Qt::WA_OpaquePaintEvent, true);

    setAttribute(Qt::WA_NoSystemBackground, true);

    setMouseTracking(true);

}

SlideShow::~SlideShow()

{

    delete d;

}

void SlideShow::addImageDir(QString dirName)

{

    QDir dir(dirName);

    QStringList fileNames = dir.entryList(QDir::Files | QDir::Readable, QDir::Name);

    for (int i=0; i<fileNames.count(); i++)

        d->imagePaths << dir.absoluteFilePath(fileNames[i]);

}

void SlideShow::addImage(QString filename)

{

    d->imagePaths << filename;

}

void SlideShow::clearImages()

{

    d->imagePaths.clear();

}

void SlideShow::startShow()

{

    d->interSlideTimer.start(d->slideInterval, this);

    d->showNextSlide();

    update();

}

void SlideShow::stopShow()

{

    d->interSlideTimer.stop();

}

int SlideShow::slideInterval()

{

    return d->slideInterval;

}

void SlideShow::setSlideInterval(int val)

{

    d->slideInterval = val;

}

void SlideShow::timerEvent(QTimerEvent* event)

{

    Q_UNUSED(event);

    d->showNextSlide();

    update();

}

void SlideShow::paintEvent(QPaintEvent *event)

{

    QPainter painter(this);

    painter.setRenderHint(QPainter::Antialiasing, false);

    if (d->imagePaths.size() > 0) {

        QPixmap slide = QPixmap(d->imagePaths[d->currentSlide]);

        QSize slideSize = slide.size();

        QSize scaledSize = QSize(qMin(slideSize.width(), size().width()),

            qMin(slideSize.height(), size().height()));

        if (slideSize != scaledSize)

            slide = slide.scaled(scaledSize, Qt::KeepAspectRatio);

        QRect pixmapRect(qMax( (size().width() - slide.width())/2, 0),

                         qMax( (size().height() - slide.height())/2, 0),

                         slide.width(),

                         slide.height());

        if (pixmapRect.top() > 0) {

            // Fill in top & bottom rectangles:

            painter.fillRect(0, 0, size().width(), pixmapRect.top(), Qt::black);

            painter.fillRect(0, pixmapRect.bottom(), size().width(), size().height(), Qt::black);

        }

        if (pixmapRect.left() > 0) {

            // Fill in left & right rectangles:

            painter.fillRect(0, 0, pixmapRect.left(), size().height(), Qt::black);

            painter.fillRect(pixmapRect.right(), 0, size().width(), size().height(), Qt::black);

        }

        painter.drawPixmap(pixmapRect, slide);

    } else

        painter.fillRect(event->rect(), Qt::black);

}

void SlideShow::keyPressEvent(QKeyEvent* event)

{

    Q_UNUSED(event);

    emit inputReceived();

}

void SlideShow::mouseMoveEvent(QMouseEvent* event)

{

    Q_UNUSED(event);

    emit inputReceived();

}

void SlideShow::mousePressEvent(QMouseEvent* event)

{

    Q_UNUSED(event);

    emit inputReceived();

}

void SlideShow::mouseReleaseEvent(QMouseEvent* event)

{

    Q_UNUSED(event);

    emit inputReceived();

}

void SlideShow::showEvent(QShowEvent * event )

{

    Q_UNUSED(event);

#ifndef QT_NO_CURSOR

    setCursor(Qt::BlankCursor);

#endif

}