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import time
import warnings
from AnyQt.QtCore import pyqtProperty, pyqtSignal, pyqtSlot
class ProgressBarMixin:
__progressBarValue = 0
__progressState = 0
startTime = -1 # used in progressbar
captionTitle = ""
def setCaption(self, caption):
self.captionTitle = caption
self.setWindowTitle(caption)
@pyqtSlot()
def progressBarInit(self):
"""
Initialize the widget's progress (i.e show and set progress to 0%).
"""
self.startTime = time.time()
self.setWindowTitle(self.captionTitle + " (0% complete)")
if self.__progressState != 1:
self.__progressState = 1
self.processingStateChanged.emit(1)
self.progressBarSet(0)
@pyqtSlot(float)
def progressBarSet(self, value):
"""
Set the current progress bar to `value`.
Parameters
----------
value : float
Progress value.
"""
old = self.__progressBarValue
self.__progressBarValue = value
if value > 0:
if self.__progressState != 1:
warnings.warn("progressBarSet() called without a "
"preceding progressBarInit()",
stacklevel=2)
self.__progressState = 1
self.processingStateChanged.emit(1)
usedTime = max(1., time.time() - self.startTime)
totalTime = 100.0 * usedTime / value
remainingTime = max(0, int(totalTime - usedTime))
hrs = remainingTime // 3600
mins = (remainingTime % 3600) // 60
secs = remainingTime % 60
if hrs > 0:
text = "{}:{:02}:{:02}".format(hrs, mins, secs)
else:
text = "{}:{}:{:02}".format(hrs, mins, secs)
self.setWindowTitle("{} ({:d}%, ETA: {})"
.format(self.captionTitle, int(value), text))
else:
self.setWindowTitle(self.captionTitle + " (0% complete)")
if old != value:
self.progressBarValueChanged.emit(value)
def progressBarValue(self):
"""
Return the state (value) of the progress bar
"""
return self.__progressBarValue
progressBarValueChanged = pyqtSignal(float)
progressBarValue = pyqtProperty(
float, fset=progressBarSet, fget=progressBarValue,
notify=progressBarValueChanged
)
processingStateChanged = pyqtSignal(int)
processingState = pyqtProperty(
int,
fget=lambda self: self.__progressState,
notify=processingStateChanged
)
@pyqtSlot(float)
def progressBarAdvance(self, value):
"""
Advance the progress bar by `value`.
Parameters
----------
value : float
Progress value increment.
"""
self.progressBarSet(self.__progressBarValue + value)
@pyqtSlot()
def progressBarFinished(self):
"""
Stop the widget's progress (i.e hide the progress bar).
Parameters
----------
value : float
Progress value increment.
"""
self.setWindowTitle(self.captionTitle)
if self.__progressState != 0:
self.__progressState = 0
self.processingStateChanged.emit(0)
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