qt5base-lts/examples/effects/blurpicker/blurpicker.cpp

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/****************************************************************************
**
** Copyright (C) 2011 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.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
** the names of its contributors may be used to endorse or promote
** products derived from this software without specific prior written
** permission.
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
** $QT_END_LICENSE$
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****************************************************************************/
#include "blurpicker.h"
#include <QtWidgets>
#include "blureffect.h"
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif
BlurPicker::BlurPicker(QWidget *parent): QGraphicsView(parent), m_index(0.0), m_animation(this, "index")
{
setBackgroundBrush(QPixmap(":/images/background.jpg"));
setScene(new QGraphicsScene(this));
setupScene();
setIndex(0);
m_animation.setDuration(400);
m_animation.setEasingCurve(QEasingCurve::InOutSine);
setRenderHint(QPainter::Antialiasing, true);
setFrameStyle(QFrame::NoFrame);
}
qreal BlurPicker::index() const
{
return m_index;
}
void BlurPicker::setIndex(qreal index)
{
m_index = index;
qreal baseline = 0;
for (int i = 0; i < m_icons.count(); ++i) {
QGraphicsItem *icon = m_icons[i];
qreal a = ((i + m_index) * 2 * M_PI) / m_icons.count();
qreal xs = 170 * sin(a);
qreal ys = 100 * cos(a);
QPointF pos(xs, ys);
pos = QTransform().rotate(-20).map(pos);
pos -= QPointF(40, 40);
icon->setPos(pos);
baseline = qMax(baseline, ys);
static_cast<BlurEffect *>(icon->graphicsEffect())->setBaseLine(baseline);
}
scene()->update();
}
void BlurPicker::setupScene()
{
scene()->setSceneRect(-200, -120, 400, 240);
QStringList names;
names << ":/images/accessories-calculator.png";
names << ":/images/accessories-text-editor.png";
names << ":/images/help-browser.png";
names << ":/images/internet-group-chat.png";
names << ":/images/internet-mail.png";
names << ":/images/internet-web-browser.png";
names << ":/images/office-calendar.png";
names << ":/images/system-users.png";
for (int i = 0; i < names.count(); i++) {
QPixmap pixmap(names[i]);
QGraphicsPixmapItem *icon = scene()->addPixmap(pixmap);
icon->setZValue(1);
icon->setGraphicsEffect(new BlurEffect(icon));
m_icons << icon;
}
QGraphicsPixmapItem *bg = scene()->addPixmap(QPixmap(":/images/background.jpg"));
bg->setZValue(0);
bg->setPos(-200, -150);
}
void BlurPicker::keyPressEvent(QKeyEvent *event)
{
int delta = 0;
switch (event->key())
{
case Qt::Key_Left:
delta = -1;
break;
case Qt::Key_Right:
delta = 1;
break;
default:
break;
}
if (m_animation.state() == QAbstractAnimation::Stopped && delta) {
m_animation.setEndValue(m_index + delta);
m_animation.start();
event->accept();
}
}
void BlurPicker::resizeEvent(QResizeEvent */*event*/)
{
#if defined(Q_WS_S60) || defined(Q_WS_MAEMO_5) || defined(Q_WS_SIMULATOR)
fitInView(sceneRect(), Qt::KeepAspectRatio);
#endif
}
void BlurPicker::mousePressEvent(QMouseEvent *event)
{
int delta = 0;
if(event->x() > (width() / 2))
{
delta = 1;
}
else
{
delta = -1;
}
if (m_animation.state() == QAbstractAnimation::Stopped && delta) {
m_animation.setEndValue(m_index + delta);
m_animation.start();
event->accept();
}
}