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#include "fademessage.h"

#include <QtGui>

FadeMessage::FadeMessage(QWidget *parent): QGraphicsView(parent)

{

    setScene(&m_scene);

    setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);

    setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);

    setupScene();

    m_animation = new QPropertyAnimation(m_effect, "strength", this);

    m_animation->setDuration(500);

    m_animation->setEasingCurve(QEasingCurve::InOutSine);

    m_animation->setStartValue(0);

    m_animation->setEndValue(1);

    setRenderHint(QPainter::Antialiasing, true);

    setFrameStyle(QFrame::NoFrame);

}

void FadeMessage::togglePopup()

{

    if (m_message->isVisible()) {

        m_message->setVisible(false);

        m_animation->setDirection(QAbstractAnimation::Backward);

    } else {

        m_message->setVisible(true);

        m_animation->setDirection(QAbstractAnimation::Forward);

    }

    m_animation->start();

}

void FadeMessage::setupScene()

{

    QGraphicsRectItem *parent = m_scene.addRect(0, 0, 400, 600);

    parent->setPen(Qt::NoPen);

    parent->setZValue(0);

    QGraphicsPixmapItem *bg = m_scene.addPixmap(QPixmap(":/background.jpg"));

    bg->setParentItem(parent);

    bg->setZValue(-1);

    for (int i = 1; i < 5; ++i)

        for (int j = 2; j < 5; ++j) {

            QGraphicsRectItem *item = m_scene.addRect(i * 50, j * 50, 38, 38);

            item->setParentItem(parent);

            item->setZValue(1);

            int hue = 12 * (i * 5 + j);

            item->setBrush(QColor::fromHsv(hue, 128, 128));

        }

    QFont font;

    font.setPointSize(font.pointSize() * 2);

    font.setBold(true);

    QFontMetrics fontMetrics(font);

    int fh = fontMetrics.height();

    QString sceneText = "Qt Everywhere!";

    int sceneTextWidth = fontMetrics.width(sceneText);

    QGraphicsRectItem *block = m_scene.addRect(50, 300, sceneTextWidth, fh + 3);

    block->setPen(Qt::NoPen);

    block->setBrush(QColor(102, 153, 51));

    QGraphicsTextItem *text = m_scene.addText(sceneText, font);

    text->setDefaultTextColor(Qt::white);

    text->setPos(50, 300);

    block->setZValue(2);

    block->hide();

    text->setParentItem(block);

    m_message = block;

    m_effect = new QGraphicsColorizeEffect;

    m_effect->setColor(QColor(122, 193, 66));

    m_effect->setStrength(0);

    m_effect->setEnabled(true);

    parent->setGraphicsEffect(m_effect);

    QPushButton *press = new QPushButton;

    press->setText(tr("Press me"));

    connect(press, SIGNAL(clicked()), SLOT(togglePopup()));

    m_scene.addWidget(press);

    press->move(300, 500);

}