Mercurial Repositories > eric / file comparison
comparison: Utilities/AutoSaver.py
Utilities/AutoSaver.py
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- de9c2efb9d02
- child 13
- 1af94a91f439
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| 1 # -*- coding: utf-8 -*- | |
| 2 | |
| 3 # Copyright (c) 2009 Detlev Offenbach <detlev@die-offenbachs.de> | |
| 4 # | |
| 5 | |
| 6 """ | |
| 7 Module implementing an auto saver class. | |
| 8 """ | |
| 9 | |
| 10 from PyQt4.QtCore import QObject, QBasicTimer, QTime | |
| 11 | |
| 12 class AutoSaver(QObject): | |
| 13 """ | |
| 14 Class implementing the auto saver. | |
| 15 """ | |
| 16 AUTOSAVE_IN = 1000 * 3 | |
| 17 MAXWAIT = 1000 * 15 | |
| 18 | |
| 19 def __init__(self, parent, save): | |
| 20 """ | |
| 21 Constructor | |
| 22 | |
| 23 @param parent reference to the parent object (QObject) | |
| 24 @param save slot to be called to perform the save operation | |
| 25 """ | |
| 26 QObject.__init__(self, parent) | |
| 27 | |
| 28 if parent is None: | |
| 29 raise RuntimeError("AutoSaver: parent must not be None.") | |
| 30 | |
| 31 self.__save = save | |
| 32 | |
| 33 self.__timer = QBasicTimer() | |
| 34 self.__firstChange = QTime() | |
| 35 | |
| 36 def changeOccurred(self): | |
| 37 """ | |
| 38 Public slot handling a change. | |
| 39 """ | |
| 40 if self.__firstChange.isNull(): | |
| 41 self.__firstChange.start() | |
| 42 | |
| 43 if self.__firstChange.elapsed() > self.MAXWAIT: | |
| 44 self.saveIfNeccessary() | |
| 45 else: | |
| 46 self.__timer.start(self.AUTOSAVE_IN, self) | |
| 47 | |
| 48 def timerEvent(self, evt): | |
| 49 """ | |
| 50 Protected method handling timer events. | |
| 51 | |
| 52 @param evt reference to the timer event (QTimerEvent) | |
| 53 """ | |
| 54 if evt.timerId() == self.__timer.timerId(): | |
| 55 self.saveIfNeccessary() | |
| 56 else: | |
| 57 QObject.timerEvent(self, evt) | |
| 58 | |
| 59 def saveIfNeccessary(self): | |
| 60 """ | |
| 61 Public method to activate the save operation. | |
| 62 """ | |
| 63 if not self.__timer.isActive(): | |
| 64 return | |
| 65 | |
| 66 self.__timer.stop() | |
| 67 self.__firstChange = QTime() | |
| 68 self.__save() |
