/GUI/Generic/GRadioButtons.py

 1#
 2#		Python GUI - Radio buttons - Generic
 3#
 4
 5from Properties import overridable_property
 6from Controls import Control
 7
 8class RadioButton(Control):
 9    """RadioButtons are used in groups to represent a 1-of-N
10    choice. A group of RadioButtons is coordinated by a
11    RadioGroup object. The 'group' property indicates the
12    RadioGroup to which it belongs, and the 'value' property
13    is the value to which the RadioGroup's value is set
14    when this RadioButton is selected."""
15    
16    group = overridable_property('group', """The RadioGroup to
17                which this radio button belongs.""")
18
19    value = overridable_property('value', """The value to which
20                the associated radio group's 'value' property should be
21                set when this radio button is selected.""")
22
23    _group = None
24    _value = None
25
26    #
27    #		Properties
28    #
29
30    def get_group(self):
31        return self._group
32
33    def set_group(self, new_group):
34        old_group = self._group
35        if new_group is not old_group:
36            if old_group:
37                old_group._remove(self)
38            self._group = new_group
39            if new_group:
40                new_group._add(self)
41
42    def get_value(self):
43        return self._value
44
45    def set_value(self, new_value):
46        old_value = self._value
47        if new_value != old_value:
48            self._value = new_value
49            self._value_changed()
50    
51    def _value_changed(self):
52        raise NotImplementedError