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#!/usr/bin/python
# -*- mode: python; coding: utf-8; -*-
# =============================================================================
# Copyright (C) 2017-2023 LB
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# Flake8: noqa
#
# =============================================================================
import logging
from kivy.event import EventDispatcher
from kivy.properties import BooleanProperty
from kivy.properties import NumericProperty
from kivy.properties import ListProperty
from kivy.properties import StringProperty
# =============================================================================
# Joins kivy properties to object members of referenced class.
# Usage:
# - use derived classes LBoolWrap etc. according to type.
# - write: obj.value = <new value>
# - read: <actual value> = obj.value
# - If you need additional functionality on change add a callback function
# as 'command'. It will be called whenever the value changes.
class LObjWrap(EventDispatcher):
def __init__(self,obj,ref=None,command=None):
self.obj = obj
self.ref = ref
if self.ref is not None:
self.value = getattr(self.obj,self.ref)
# logging.info("LObjWrap: setup for %s" % (self.ref))
self.bind(value=self.on_value)
if command is not None:
self.bind(value=command)
def on_value(self,inst,val):
# logging.info("LObjWrap: %s = %s" % (self.ref,val))
if self.ref is not None:
setattr(self.obj,self.ref,val)
class LBoolWrap(LObjWrap):
value = BooleanProperty(False)
def __init__(self,obj,ref=None,command=None):
super(LBoolWrap,self).__init__(obj,ref,command)
class LNumWrap(LObjWrap):
value = NumericProperty(0)
def __init__(self,obj,ref=None,command=None):
super(LNumWrap,self).__init__(obj,ref,command)
class LStringWrap(LObjWrap):
value = StringProperty('')
def __init__(self,obj,ref=None,command=None):
super(LStringWrap,self).__init__(obj,ref,command)
class LListWrap(LObjWrap):
value = ListProperty([])
def __init__(self,obj,ref=None,command=None):
super(LListWrap,self).__init__(obj,ref,command)
# =============================================================================
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