examples/effects/blurpicker/blurpicker.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 06 Jul 2010 15:10:48 +0300
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Revision: 201025 Kit: 2010127
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/****************************************************************************
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**
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the examples of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:BSD$
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** You may use this file under the terms of the BSD license as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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**   * Redistributions of source code must retain the above copyright
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**     notice, this list of conditions and the following disclaimer.
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**   * Redistributions in binary form must reproduce the above copyright
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**     notice, this list of conditions and the following disclaimer in
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**     the documentation and/or other materials provided with the
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**     distribution.
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**   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
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**     the names of its contributors may be used to endorse or promote
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**     products derived from this software without specific prior written
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**     permission.
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "blurpicker.h"
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#include <QtGui>
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#include "blureffect.h"
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#ifndef M_PI
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#define M_PI 3.14159265358979323846
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#endif
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BlurPicker::BlurPicker(QWidget *parent): QGraphicsView(parent), m_index(0.0), m_animation(this, "index")
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{
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    setBackgroundBrush(QPixmap(":/images/background.jpg"));
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    setScene(new QGraphicsScene(this));
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    setupScene();
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    setIndex(0);
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    m_animation.setDuration(400);
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    m_animation.setEasingCurve(QEasingCurve::InOutSine);
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    setRenderHint(QPainter::Antialiasing, true);
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    setFrameStyle(QFrame::NoFrame);
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}
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qreal BlurPicker::index() const
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{
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    return m_index;
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}
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void BlurPicker::setIndex(qreal index)
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{
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    m_index = index;
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    qreal baseline = 0;
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    for (int i = 0; i < m_icons.count(); ++i) {
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        QGraphicsItem *icon = m_icons[i];
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        qreal a = ((i + m_index) * 2 * M_PI) / m_icons.count();
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        qreal xs = 170 * sin(a);
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        qreal ys = 100 * cos(a);
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        QPointF pos(xs, ys);
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        pos = QTransform().rotate(-20).map(pos);
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        pos -= QPointF(40, 40);
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        icon->setPos(pos);
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        baseline = qMax(baseline, ys);
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        static_cast<BlurEffect *>(icon->graphicsEffect())->setBaseLine(baseline);
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    }
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    scene()->update();
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}
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void BlurPicker::setupScene()
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{
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    scene()->setSceneRect(-200, -120, 400, 240);
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    QStringList names;
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    names << ":/images/accessories-calculator.png";
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    names << ":/images/accessories-text-editor.png";
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    names << ":/images/help-browser.png";
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    names << ":/images/internet-group-chat.png";
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    names << ":/images/internet-mail.png";
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    names << ":/images/internet-web-browser.png";
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    names << ":/images/office-calendar.png";
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    names << ":/images/system-users.png";
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    for (int i = 0; i < names.count(); i++) {
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        QPixmap pixmap(names[i]);
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        QGraphicsPixmapItem *icon = scene()->addPixmap(pixmap);
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        icon->setZValue(1);
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        icon->setGraphicsEffect(new BlurEffect(icon));
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        m_icons << icon;
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    }
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    QGraphicsPixmapItem *bg = scene()->addPixmap(QPixmap(":/images/background.jpg"));
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    bg->setZValue(0);
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    bg->setPos(-200, -150);
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}
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void BlurPicker::keyPressEvent(QKeyEvent *event)
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{
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    int delta = 0;
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    switch (event->key())
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    {
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    case Qt::Key_Left:
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        delta = -1;
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        break;
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    case  Qt::Key_Right:
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        delta = 1;
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        break;
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    default:
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        break;
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    }
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parents: 0
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    if (m_animation.state() == QAbstractAnimation::Stopped && delta) {
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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            m_animation.setEndValue(m_index + delta);
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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   135
            m_animation.start();
0
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Alex Gilkes <alex.gilkes@nokia.com>
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   136
            event->accept();
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   137
    }
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}