blurpicker.cpp Example File

effects/blurpicker/blurpicker.cpp
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#include "blurpicker.h" #include <QtWidgets> #include <QtCore/qmath.h> #include <qmath.h> #include "blureffect.h" 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; const qreal iconAngle = 2 * M_PI / m_icons.count(); for (int i = 0; i < m_icons.count(); ++i) { QGraphicsItem *icon = m_icons[i]; qreal a = (i + m_index) * iconAngle; qreal xs = 170 * qSin(a); qreal ys = 100 * qCos(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 */) { } 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(); } }