chasewidget.cpp Example File
webkitwidgets/browser/chasewidget.cpp
#include "chasewidget.h"
#include <QtCore/QPoint>
#include <QtWidgets/QApplication>
#include <QtGui/QHideEvent>
#include <QtGui/QPainter>
#include <QtGui/QPaintEvent>
#include <QtGui/QShowEvent>
ChaseWidget::ChaseWidget(QWidget *parent, QPixmap pixmap, bool pixmapEnabled)
: QWidget(parent)
, m_segment(0)
, m_delay(100)
, m_step(40)
, m_timerId(-1)
, m_animated(false)
, m_pixmap(pixmap)
, m_pixmapEnabled(pixmapEnabled)
{
}
void ChaseWidget::setAnimated(bool value)
{
if (m_animated == value)
return;
m_animated = value;
if (m_timerId != -1) {
killTimer(m_timerId);
m_timerId = -1;
}
if (m_animated) {
m_segment = 0;
m_timerId = startTimer(m_delay);
}
update();
}
void ChaseWidget::paintEvent(QPaintEvent *event)
{
Q_UNUSED(event);
QPainter p(this);
if (m_pixmapEnabled && !m_pixmap.isNull()) {
p.drawPixmap(0, 0, m_pixmap);
return;
}
const int extent = qMin(width() - 8, height() - 8);
const int displ = extent / 4;
const int ext = extent / 4 - 1;
p.setRenderHint(QPainter::Antialiasing, true);
if(m_animated)
p.setPen(Qt::gray);
else
p.setPen(QPen(palette().dark().color()));
p.translate(width() / 2, height() / 2);
for (int segment = 0; segment < segmentCount(); ++segment) {
p.rotate(QApplication::isRightToLeft() ? m_step : -m_step);
if(m_animated)
p.setBrush(colorForSegment(segment));
else
p.setBrush(palette().background());
p.drawEllipse(QRect(displ, -ext / 2, ext, ext));
}
}
QSize ChaseWidget::sizeHint() const
{
return QSize(32, 32);
}
void ChaseWidget::timerEvent(QTimerEvent *event)
{
if (event->timerId() == m_timerId) {
++m_segment;
update();
}
QWidget::timerEvent(event);
}
QColor ChaseWidget::colorForSegment(int seg) const
{
int index = ((seg + m_segment) % segmentCount());
int comp = qMax(0, 255 - (index * (255 / segmentCount())));
return QColor(comp, comp, comp, 255);
}
int ChaseWidget::segmentCount() const
{
return 360 / m_step;
}
void ChaseWidget::setPixmapEnabled(bool enable)
{
m_pixmapEnabled = enable;
}