Source code for camelot.view.controls.busy_widget

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from PyQt4 import QtGui, QtCore
from PyQt4.QtCore import Qt

[docs]class BusyWidget(QtGui.QWidget): """A widget indicating the application is performing some background task. The widget acts as an overlay of its parent widget and displays animating orbs""" def __init__(self, parent = None): QtGui.QWidget.__init__(self, parent) palette = QtGui.QPalette(self.palette()) palette.setColor(palette.Background, Qt.transparent) self.setPalette(palette) self.setAttribute(Qt.WA_TransparentForMouseEvents) self.orbs = 5 self.highlighted_orb = self.orbs self.timer = None @QtCore.pyqtSlot(bool)
[docs] def set_busy(self, busy_state): """start/stop the animation :arg busy_state: True or False """ # # the set_busy method might get called multiple times with # busy_state=True before calls with busy_state=False, # so a check on self.timer is needed to prevent multiple timers # from being started # if busy_state and self.timer==None: self.timer = self.startTimer(200) self.counter = 0 self.show() else: if self.timer: self.killTimer(self.timer) self.timer = None self.hide()
[docs] def paintEvent(self, event): """custom paint, painting the orbs""" painter = QtGui.QPainter() painter.begin(self) painter.setRenderHint(QtGui.QPainter.Antialiasing) painter.setPen(QtGui.QPen(Qt.NoPen)) width = self.width() height = self.height() radius = min(width/(3*self.orbs+1), height/4) for i in range(self.orbs): if i!=self.highlighted_orb: painter.setBrush(QtGui.QBrush(QtGui.QColor(180, 180, 180))) else: painter.setBrush(QtGui.QBrush(QtGui.QColor(127, 127, 127))) center_x = width - (3*i+2)*radius center_y = height / 2 painter.drawEllipse(center_x - radius, center_y - radius, 2*radius, 2*radius) painter.end()
[docs] def timerEvent(self, event): """custom timer event, updating the animation""" self.update() self.counter += 1 self.highlighted_orb -= 1 if self.highlighted_orb < 0: self.highlighted_orb = self.orbs

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