Utilities/AutoSaver.py

Tue, 02 Oct 2012 19:53:31 +0200

author
Detlev Offenbach <detlev@die-offenbachs.de>
date
Tue, 02 Oct 2012 19:53:31 +0200
changeset 2087
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parent 1509
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child 2302
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permissions
-rw-r--r--

Made the sixth set of Qt5 compatibility changes.

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1 # -*- coding: utf-8 -*-
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2
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3 # Copyright (c) 2009 - 2012 Detlev Offenbach <detlev@die-offenbachs.de>
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4 #
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5
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6 """
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7 Module implementing an auto saver class.
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8 """
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9
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10 from PyQt4.QtCore import QObject, QBasicTimer, QTime
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11
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12
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13 class AutoSaver(QObject):
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14 """
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15 Class implementing the auto saver.
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16 """
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17 AUTOSAVE_IN = 1000 * 3
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18 MAXWAIT = 1000 * 15
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19
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20 def __init__(self, parent, save):
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21 """
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22 Constructor
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23
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24 @param parent reference to the parent object (QObject)
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25 @param save slot to be called to perform the save operation
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26 """
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27 super().__init__(parent)
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28
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29 if parent is None:
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30 raise RuntimeError("AutoSaver: parent must not be None.")
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31
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32 self.__save = save
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33
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34 self.__timer = QBasicTimer()
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35 self.__firstChange = QTime()
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36
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37 def changeOccurred(self):
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38 """
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39 Public slot handling a change.
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40 """
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41 if self.__firstChange.isNull():
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42 self.__firstChange.start()
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43
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44 if self.__firstChange.elapsed() > self.MAXWAIT:
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45 self.saveIfNeccessary()
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46 else:
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47 self.__timer.start(self.AUTOSAVE_IN, self)
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48
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49 def timerEvent(self, evt):
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50 """
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51 Protected method handling timer events.
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52
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53 @param evt reference to the timer event (QTimerEvent)
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54 """
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55 if evt.timerId() == self.__timer.timerId():
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56 self.saveIfNeccessary()
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57 else:
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58 super().timerEvent(evt)
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59
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60 def saveIfNeccessary(self):
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61 """
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62 Public method to activate the save operation.
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63 """
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64 if not self.__timer.isActive():
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65 return
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66
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67 self.__timer.stop()
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68 self.__firstChange = QTime()
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69 self.__save()

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