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

**

** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** Contact: Nokia Corporation (qt-info@nokia.com)

**

** This file is part of the examples of the Qt Toolkit.

**

** $QT_BEGIN_LICENSE:LGPL$

** No Commercial Usage

** This file contains pre-release code and may not be distributed.

** You may use this file in accordance with the terms and conditions

** contained in the Technology Preview License Agreement accompanying

** this package.

**

** GNU Lesser General Public License Usage

** Alternatively, this file may be used under the terms of the GNU Lesser

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

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

** packaging of this file.  Please review the following information to

** ensure the GNU Lesser General Public License version 2.1 requirements

** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.

**

** In addition, as a special exception, Nokia gives you certain additional

** rights.  These rights are described in the Nokia Qt LGPL Exception

** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

**

** If you have questions regarding the use of this file, please contact

** Nokia at qt-info@nokia.com.

**

**

**

**

**

**

**

**

** $QT_END_LICENSE$

**

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

#include "fademessage.h"

#include <QtGui>

FadeMessage::FadeMessage(QWidget *parent): QGraphicsView(parent), m_index(0.0)

{

    setScene(&m_scene);

    setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);

    setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);

    setupScene();

    m_timeLine = new QTimeLine(500, this);

    m_timeLine->setCurveShape(QTimeLine::EaseInOutCurve);

    connect(m_timeLine, SIGNAL(valueChanged(qreal)), m_effect, SLOT(setStrength(qreal)));

    setRenderHint(QPainter::Antialiasing, true);

    setFrameStyle(QFrame::NoFrame);

}

void FadeMessage::togglePopup()

{

    if (m_message->isVisible()) {

        m_message->setVisible(false);

        m_timeLine->setDirection(QTimeLine::Backward);

        m_timeLine->start();

    } else {

        m_message->setVisible(true);

        m_timeLine->setDirection(QTimeLine::Forward);

        m_timeLine->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);

    int fh = QFontMetrics(font).height();

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

    block->setPen(Qt::NoPen);

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

    QGraphicsTextItem *text = m_scene.addText("Qt Everywhere!", 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);

}