00001 # Software License Agreement (BSD License) 00002 # 00003 # Copyright (c) 2012, Willow Garage, Inc. 00004 # All rights reserved. 00005 # 00006 # Redistribution and use in source and binary forms, with or without 00007 # modification, are permitted provided that the following conditions 00008 # are met: 00009 # 00010 # * Redistributions of source code must retain the above copyright 00011 # notice, this list of conditions and the following disclaimer. 00012 # * Redistributions in binary form must reproduce the above 00013 # copyright notice, this list of conditions and the following 00014 # disclaimer in the documentation and/or other materials provided 00015 # with the distribution. 00016 # * Neither the name of Willow Garage, Inc. nor the names of its 00017 # contributors may be used to stoporse or promote products derived 00018 # from this software without specific prior written permission. 00019 # 00020 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 00021 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 00022 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 00023 # FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 00024 # COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 00025 # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 00026 # BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 00027 # LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 00028 # CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 00029 # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 00030 # ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 00031 # POSSIBILITY OF SUCH DAMAGE. 00032 00033 from python_qt_binding.QtCore import QObject, QTimer, Signal 00034 00035 00036 class BaseFilter(QObject): 00037 """ 00038 Contains basic functions common to all filters. Handles enabled code and 00039 """ 00040 filter_changed_signal = Signal() 00041 00042 def __init__(self): 00043 super(QObject, self).__init__() 00044 self._enabled = True 00045 00046 self._timer = QTimer(self) 00047 self._timer.setSingleShot(True) 00048 self._timer.timeout.connect(self.filter_changed_signal.emit) 00049 00050 def start_emit_timer(self, msec=None): 00051 """ 00052 Starts a timer to emit a signal to refresh the filters after the filter is changed 00053 :param msec: number of msecs to wait before emitting the signal to change the filter ''int'' 00054 """ 00055 if msec is None: 00056 self._timer.start(10) 00057 else: 00058 self._timer.start(msec) 00059 00060 def is_enabled(self): 00061 return self._enabled 00062 00063 def set_enabled(self, checked): 00064 """ 00065 Setter for _enabled 00066 :param checked: boolean flag to set ''bool'' 00067 :emits filter_changed_signal: Always 00068 """ 00069 self._enabled = checked 00070 self.start_emit_timer(200)