gistfile1.txt

class RangeObservingList(ObservableList):
    '''Adds range-observing intelligence to ObservableList'''

    range_change = ObjectProperty(None)

    def __init__(self, *largs):
        super(RangeObservingList, self).__init__(*largs)

    def __setitem__(self, key, value):
        self.range_change = None
        super(RangeObservingList, self).__setitem__(key, value)

    def __delitem__(self, key):
        index = self.index(key)
        self.range_change = ('delete', (index, index))
        super(RangeObservingList, self).__delitem__(key)

    def __setslice__(self, *largs):
        self.range_change = None
        super(RangeObservingList, self).__setslice__(*largs)

    def __delslice__(self, *largs):
        start_index = largs[0]
        end_index = largs[-1]
        self.range_change = ('delete', (start_index, end_index))
        super(RangeObservingList, self).__delslice__(*largs)

    def __iadd__(self, *largs):
        self.range_change = None
        super(RangeObservingList, self).__iadd__(*largs)

    def __imul__(self, *largs):
        self.range_change = None
        super(RangeObservingList, self).__imul__(*largs)

    def append(self, *largs):
        index = len(self)
        self.range_change = ('add', (index, index))
        super(RangeObservingList, self).append(*largs)

    def remove(self, *largs):
        index = self.index(largs[0])
        self.range_change = ('delete', (index, index))
        super(RangeObservingList, self).remove(*largs)

    def insert(self, *largs):
        index = self.index(largs[0])
        self.range_change = ('insert', (index, index))
        super(RangeObservingList, self).insert(*largs)

    def pop(self, *largs):
        if largs[0]:
            index = self.index(largs[0])
        else:
            index = len(self) - 1
        self.range_change = ('remove', (index, index))
        return super(RangeObservingList, self).pop(*largs)

    def extend(self, *largs):
        start_index = len(self)
        end_index = start_index + len(largs) - 1
        self.range_change = ('add', (start_index, end_index))
        super(RangeObservingList, self).extend(*largs)

    def sort(self, *largs):
        self.range_change = ('sort', (0, len(self) - 1))
        super(RangeObservingList, self).sort(*largs)

    def reverse(self, *largs):
        self.range_change = ('sort', (0, len(self) - 1))
        super(RangeObservingList, self).reverse(*largs)