eric6/Utilities/AutoSaver.py

Sun, 21 Jun 2020 18:26:12 +0200

author
Detlev Offenbach <detlev@die-offenbachs.de>
date
Sun, 21 Jun 2020 18:26:12 +0200
changeset 7635
0cdead130a81
parent 7360
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child 7781
607a6098cb44
permissions
-rw-r--r--

Removed support for Python2 and removed support for Qt4 (PyQt4 and pyside).

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1 # -*- coding: utf-8 -*-
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2
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3 # Copyright (c) 2009 - 2020 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
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11 from PyQt5.QtCore import QObject, QBasicTimer, QTime
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12
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13
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14 class AutoSaver(QObject):
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15 """
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16 Class implementing the auto saver.
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17 """
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18 AUTOSAVE_IN = 1000 * 3
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19 MAXWAIT = 1000 * 15
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20
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21 def __init__(self, parent, save):
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22 """
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23 Constructor
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24
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25 @param parent reference to the parent object (QObject)
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26 @param save slot to be called to perform the save operation
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27 @exception RuntimeError raised, if no parent is given
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28 """
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29 super(AutoSaver, self).__init__(parent)
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30
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31 if parent is None:
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32 raise RuntimeError("AutoSaver: parent must not be None.")
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33
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34 self.__save = save
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35
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36 self.__timer = QBasicTimer()
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37 self.__firstChange = QTime()
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38
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39 def changeOccurred(self):
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40 """
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41 Public slot handling a change.
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42 """
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43 if self.__firstChange.isNull():
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44 self.__firstChange.start()
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45
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46 if self.__firstChange.elapsed() > self.MAXWAIT:
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47 self.saveIfNeccessary()
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48 else:
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49 self.__timer.start(self.AUTOSAVE_IN, self)
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50
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51 def timerEvent(self, evt):
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52 """
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53 Protected method handling timer events.
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54
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55 @param evt reference to the timer event (QTimerEvent)
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56 """
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57 if evt.timerId() == self.__timer.timerId():
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58 self.saveIfNeccessary()
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59 else:
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60 super(AutoSaver, self).timerEvent(evt)
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61
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62 def saveIfNeccessary(self):
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63 """
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64 Public method to activate the save operation.
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65 """
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66 if not self.__timer.isActive():
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67 return
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68
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69 self.__timer.stop()
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70 self.__firstChange = QTime()
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71 self.__save()

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