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2abf5a93 JS |
1 | ## |
2 | ## This file is part of the sigrok-meter project. | |
3 | ## | |
4 | ## Copyright (C) 2015 Jens Steinhauser <jens.steinhauser@gmail.com> | |
5 | ## | |
6 | ## This program is free software; you can redistribute it and/or modify | |
7 | ## it under the terms of the GNU General Public License as published by | |
8 | ## the Free Software Foundation; either version 2 of the License, or | |
9 | ## (at your option) any later version. | |
10 | ## | |
11 | ## This program is distributed in the hope that it will be useful, | |
12 | ## but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | ## GNU General Public License for more details. | |
15 | ## | |
16 | ## You should have received a copy of the GNU General Public License | |
17 | ## along with this program; if not, write to the Free Software | |
18 | ## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | ## | |
20 | ||
21 | import qtcompat | |
22 | ||
23 | QtCore = qtcompat.QtCore | |
24 | QtGui = qtcompat.QtGui | |
25 | ||
26 | class Setting(QtCore.QObject): | |
27 | '''Wrapper class around the raw 'QSettings' class that emits signals | |
28 | when the value of the setting changes.''' | |
29 | ||
30 | '''Signal emitted when the setting has changed.''' | |
31 | changed = QtCore.Signal(object) | |
32 | ||
ac584e86 JS |
33 | def __init__(self, key, default=None, conv=None): |
34 | '''Initializes the Settings object. | |
35 | ||
36 | :param key: The key of the used 'QSettings' object. | |
37 | :param default: Value returned if the setting doesn't already exist. | |
38 | :param conv: Function used to convert the setting to the correct type. | |
39 | ''' | |
40 | ||
2abf5a93 JS |
41 | super(self.__class__, self).__init__() |
42 | ||
43 | self._key = key | |
44 | self._default = default | |
ac584e86 | 45 | self._conv = conv |
2abf5a93 JS |
46 | self._value = None |
47 | ||
48 | def value(self): | |
49 | s = QtCore.QSettings() | |
ac584e86 JS |
50 | v = s.value(self._key, self._default) |
51 | self._value = self._conv(v) if self._conv else v | |
2abf5a93 JS |
52 | return self._value |
53 | ||
54 | @QtCore.Slot(object) | |
55 | def setValue(self, value): | |
56 | if value != self._value: | |
57 | s = QtCore.QSettings() | |
58 | s.setValue(self._key, value) | |
59 | s.sync() | |
60 | self._value = value | |
61 | self.changed.emit(self._value) | |
62 | ||
63 | class _SettingsGroup(object): | |
64 | '''Dummy class to group multiple 'Setting' objects together.''' | |
65 | pass | |
66 | ||
67 | def init(): | |
68 | '''Creates the 'Settings' objects for all known settings and places them | |
69 | into the module's namespace. | |
70 | ||
71 | A QApplication must have been created before this function can be called. | |
72 | ''' | |
73 | ||
74 | app = QtGui.QApplication.instance() | |
75 | app.setApplicationName('sigrok-meter') | |
76 | app.setOrganizationName('sigrok') | |
77 | app.setOrganizationDomain('sigrok.org') | |
78 | ||
79 | mainwindow = _SettingsGroup() | |
80 | mainwindow.size = Setting('mainwindow/size', QtCore.QSize(900, 550)) | |
81 | mainwindow.pos = Setting('mainwindow/pos') | |
82 | globals()['mainwindow'] = mainwindow | |
ac584e86 JS |
83 | |
84 | graph = _SettingsGroup() | |
85 | graph.backlog = Setting('graph/backlog', 30, conv=int) | |
86 | globals()['graph'] = graph |