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     2 **

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

     4 ** All rights reserved.

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

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

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     9 ** $QT_BEGIN_LICENSE:LGPL$

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    16 ** GNU Lesser General Public License Usage

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

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

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    36 **

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    38 ** $QT_END_LICENSE$

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    40 ****************************************************************************/

    41 

    42 #include "fademessage.h"

    43 

    44 #include <QtGui>

    45 

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

    47 {

    48     setScene(&m_scene);

    49     setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);

    50     setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);

    51 

    52     setupScene();

    53 

    54     m_timeLine = new QTimeLine(500, this);

    55     m_timeLine->setCurveShape(QTimeLine::EaseInOutCurve);

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

    57 

    58     setRenderHint(QPainter::Antialiasing, true);

    59     setFrameStyle(QFrame::NoFrame);

    60 }

    61 

    62 void FadeMessage::togglePopup()

    63 {

    64     if (m_message->isVisible()) {

    65         m_message->setVisible(false);

    66         m_timeLine->setDirection(QTimeLine::Backward);

    67         m_timeLine->start();

    68     } else {

    69         m_message->setVisible(true);

    70         m_timeLine->setDirection(QTimeLine::Forward);

    71         m_timeLine->start();

    72     }

    73 }

    74 

    75 void FadeMessage::setupScene()

    76 {

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

    78     parent->setPen(Qt::NoPen);

    79     parent->setZValue(0);

    80 

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

    82     bg->setParentItem(parent);

    83     bg->setZValue(-1);

    84 

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

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

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

    88             item->setParentItem(parent);

    89             item->setZValue(1);

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

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

    92         }

    93 

    94     QFont font;

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

    96     font.setBold(true);

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

    98 

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

   100     block->setPen(Qt::NoPen);

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

   102 

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

   104     text->setDefaultTextColor(Qt::white);

   105     text->setPos(50, 300);

   106     block->setZValue(2);

   107     block->hide();

   108 

   109     text->setParentItem(block);

   110     m_message = block;

   111 

   112     m_effect = new QGraphicsColorizeEffect;

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

   114     m_effect->setStrength(0);

   115     m_effect->setEnabled(true);

   116     parent->setGraphicsEffect(m_effect);

   117 

   118     QPushButton *press = new QPushButton;

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

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

   121     m_scene.addWidget(press);

   122     press->move(300, 500);

   123 }

   124