1 files changed, 94 insertions, 0 deletions
diff --git a/qprogressindicator.cpp b/qprogressindicator.cpp
new file mode 100644
index 00000000..a626a780
--- /dev/null
+++ b/qprogressindicator.cpp
@@ -0,0 +1,94 @@
+#include "qprogressindicator.h"
+#include <QPainter>
+
+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();
+}
+
+QSize QProgressIndicator::sizeHint() const { return QSize(20, 20); }
+
+int QProgressIndicator::heightForWidth(int w) const { return w; }
+
+void QProgressIndicator::timerEvent(QTimerEvent * /*event*/) {
+  m_angle = (m_angle + 30) % 360;
+
+  update();
+}
+
+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 = (width - 1) * 0.5;
+  int innerRadius = (width - 1) * 0.5 * 0.38;
+
+  int capsuleHeight = outerRadius - innerRadius;
+  int capsuleWidth = (width > 32) ? capsuleHeight * .23 : capsuleHeight * .35;
+  int capsuleRadius = capsuleWidth / 2;
+
+  for (int i = 0; i < 12; i++) {
+    QColor color = m_color;
+    color.setAlphaF(1.0f - (i / 12.0f));
+    p.setPen(Qt::NoPen);
+    p.setBrush(color);
+    p.save();
+    p.translate(rect().center());
+    p.rotate(m_angle - i * 30.0f);
+    p.drawRoundedRect(-capsuleWidth * 0.5, -(innerRadius + capsuleHeight),
+                      capsuleWidth, capsuleHeight, capsuleRadius,
+                      capsuleRadius);
+    p.restore();
+  }
+}