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#include "fademessage.h"
#include <QtGui>
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, 400, 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 * 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.width(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);
}</pre>
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