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#include "qprogressindicator.h"
#include <QPainter>
/**
* @brief QProgressIndicator::QProgressIndicator constructor.
* @param parent widget the indicator is placed in.
*/
QProgressIndicator::QProgressIndicator(QWidget *parent)
: QWidget(parent), m_angle(0), m_timerId(-1), m_delay(40),
m_displayedWhenStopped(false), m_color(Qt::black) {
setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
setFocusPolicy(Qt::NoFocus);
}
bool QProgressIndicator::isAnimated() const { return m_timerId != -1; }
void QProgressIndicator::setDisplayedWhenStopped(bool state) {
m_displayedWhenStopped = state;
update();
}
bool QProgressIndicator::isDisplayedWhenStopped() const {
return m_displayedWhenStopped;
}
void QProgressIndicator::startAnimation() {
m_angle = 0;
if (m_timerId == -1)
m_timerId = startTimer(m_delay);
}
void QProgressIndicator::stopAnimation() {
if (m_timerId != -1)
killTimer(m_timerId);
m_timerId = -1;
update();
}
void QProgressIndicator::setAnimationDelay(int delay) {
if (m_timerId != -1)
killTimer(m_timerId);
m_delay = delay;
if (m_timerId != -1)
m_timerId = startTimer(m_delay);
}
void QProgressIndicator::setColor(const QColor &color) {
m_color = color;
update();
}
/**
* @brief QProgressIndicator::sizeHint default minimum size.
* @return QSize(20, 20)
*/
QSize QProgressIndicator::sizeHint() const { return QSize(20, 20); }
/**
* @brief QProgressIndicator::heightForWidth square ratio.
* @param w requested width
* @return w returned height
*/
int QProgressIndicator::heightForWidth(int w) const { return w; }
/**
* @brief QProgressIndicator::timerEvent do the actual animation.
*/
void QProgressIndicator::timerEvent(QTimerEvent * /*event*/) {
m_angle = (m_angle + 30) % 360;
update();
}
/**
* @brief QProgressIndicator::paintEvent draw the spinner.
*/
void QProgressIndicator::paintEvent(QPaintEvent * /*event*/) {
if (!m_displayedWhenStopped && !isAnimated())
return;
int width = qMin(this->width(), this->height());
QPainter p(this);
p.setRenderHint(QPainter::Antialiasing);
int outerRadius = int((width - 1) * 0.5);
int innerRadius = int((width - 1) * 0.5 * 0.38);
int capsuleHeight = outerRadius - innerRadius;
int capsuleWidth =
(width > 32) ? int(capsuleHeight * 0.23) : int(capsuleHeight * 0.35);
int capsuleRadius = capsuleWidth / 2;
for (int i = 0; i < 12; ++i) {
QColor color = m_color;
color.setAlphaF(int(1.0f - (i / 12.0f)));
p.setPen(Qt::NoPen);
p.setBrush(color);
p.save();
p.translate(rect().center());
p.rotate(int(m_angle - i * 30.0f));
p.drawRoundedRect(int(-capsuleWidth * 0.5), -(innerRadius + capsuleHeight),
capsuleWidth, capsuleHeight, capsuleRadius,
capsuleRadius);
p.restore();
}
}
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