eric6/Utilities/AutoSaver.py

Mon, 15 Apr 2019 19:53:29 +0200

author
Detlev Offenbach <detlev@die-offenbachs.de>
date
Mon, 15 Apr 2019 19:53:29 +0200
branch
setup.py
changeset 6949
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parent 6942
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child 7229
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permissions
-rw-r--r--

setup.py: continued implementing support for setup.py.

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1 # -*- coding: utf-8 -*-
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2
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3 # Copyright (c) 2009 - 2019 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 __future__ import unicode_literals
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11
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12 from PyQt5.QtCore import QObject, QBasicTimer, QTime
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14
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15 class AutoSaver(QObject):
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16 """
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17 Class implementing the auto saver.
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18 """
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19 AUTOSAVE_IN = 1000 * 3
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20 MAXWAIT = 1000 * 15
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21
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22 def __init__(self, parent, save):
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23 """
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24 Constructor
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25
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26 @param parent reference to the parent object (QObject)
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27 @param save slot to be called to perform the save operation
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28 @exception RuntimeError raised, if no parent is given
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29 """
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30 super(AutoSaver, self).__init__(parent)
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31
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32 if parent is None:
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33 raise RuntimeError("AutoSaver: parent must not be None.")
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34
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35 self.__save = save
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36
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37 self.__timer = QBasicTimer()
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38 self.__firstChange = QTime()
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39
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40 def changeOccurred(self):
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41 """
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42 Public slot handling a change.
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43 """
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44 if self.__firstChange.isNull():
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45 self.__firstChange.start()
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46
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47 if self.__firstChange.elapsed() > self.MAXWAIT:
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48 self.saveIfNeccessary()
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49 else:
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50 self.__timer.start(self.AUTOSAVE_IN, self)
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51
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52 def timerEvent(self, evt):
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53 """
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54 Protected method handling timer events.
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55
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56 @param evt reference to the timer event (QTimerEvent)
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57 """
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58 if evt.timerId() == self.__timer.timerId():
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59 self.saveIfNeccessary()
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60 else:
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61 super(AutoSaver, self).timerEvent(evt)
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62
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63 def saveIfNeccessary(self):
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64 """
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65 Public method to activate the save operation.
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66 """
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67 if not self.__timer.isActive():
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68 return
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69
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70 self.__timer.stop()
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71 self.__firstChange = QTime()
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72 self.__save()

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