fademessage.cpp Example File

effects/fademessage/fademessage.cpp
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#include "fademessage.h" #include <QtWidgets> FadeMessage::FadeMessage(QWidget *parent): QGraphicsView(parent) { setScene(&m_scene); setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff); setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff); setupScene(); m_animation = new QPropertyAnimation(m_effect, "strength", this); m_animation->setDuration(500); m_animation->setEasingCurve(QEasingCurve::InOutSine); m_animation->setStartValue(0); m_animation->setEndValue(1); setRenderHint(QPainter::Antialiasing, true); setFrameStyle(QFrame::NoFrame); } void FadeMessage::togglePopup() { if (m_message->isVisible()) { m_message->setVisible(false); m_animation->setDirection(QAbstractAnimation::Backward); } else { m_message->setVisible(true); m_animation->setDirection(QAbstractAnimation::Forward); } m_animation->start(); } void FadeMessage::setupScene() { QGraphicsRectItem *parent = m_scene.addRect(0, 0, 800, 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 - 1) * 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); QFontMetrics fontMetrics(font); int fh = fontMetrics.height(); QString sceneText = "Qt Everywhere!"; int sceneTextWidth = fontMetrics.horizontalAdvance(sceneText); QGraphicsRectItem *block = m_scene.addRect(50, 300, sceneTextWidth, fh + 3); block->setPen(Qt::NoPen); block->setBrush(QColor(102, 153, 51)); QGraphicsTextItem *text = m_scene.addText(sceneText, 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); }