54 lines
1.5 KiB
Python
54 lines
1.5 KiB
Python
"""Small activity spinner: a rotating accent-coloured arc. Runs only while visible."""
|
|
from PySide6.QtCore import QRectF, QTimer, Qt
|
|
from PySide6.QtGui import QColor, QPainter, QPen
|
|
from PySide6.QtWidgets import QWidget
|
|
|
|
from . import icons
|
|
|
|
STEP_MS = 16
|
|
STEP_DEG = 9
|
|
|
|
|
|
def paint_arc(p, rect, angle, color=icons.ACCENT):
|
|
"""Draw the spinner (faint ring + 100 degree arc) into rect; used by Spinner and the waveform overlay."""
|
|
w = max(1.5, rect.width() / 8)
|
|
r = rect.adjusted(w / 2, w / 2, -w / 2, -w / 2)
|
|
p.save()
|
|
p.setRenderHint(QPainter.RenderHint.Antialiasing)
|
|
ring = QColor(color)
|
|
ring.setAlpha(45)
|
|
p.setPen(QPen(ring, w))
|
|
p.drawEllipse(r)
|
|
pen = QPen(QColor(color), w)
|
|
pen.setCapStyle(Qt.PenCapStyle.RoundCap)
|
|
p.setPen(pen)
|
|
p.drawArc(r, int(-angle * 16), 100 * 16)
|
|
p.restore()
|
|
|
|
|
|
class Spinner(QWidget):
|
|
def __init__(self, size=16, parent=None):
|
|
super().__init__(parent)
|
|
self.setFixedSize(size, size)
|
|
self.angle = 0
|
|
self.timer = QTimer(self)
|
|
self.timer.setInterval(STEP_MS)
|
|
self.timer.timeout.connect(self._step)
|
|
self.hide()
|
|
|
|
def _step(self):
|
|
self.angle = (self.angle + STEP_DEG) % 360
|
|
self.update()
|
|
|
|
def showEvent(self, e):
|
|
self.timer.start()
|
|
super().showEvent(e)
|
|
|
|
def hideEvent(self, e):
|
|
self.timer.stop()
|
|
super().hideEvent(e)
|
|
|
|
def paintEvent(self, _):
|
|
p = QPainter(self)
|
|
paint_arc(p, QRectF(self.rect()), self.angle)
|