125 lines
4.3 KiB
Python
125 lines
4.3 KiB
Python
from collections import OrderedDict
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from .basetypes import WidgetParameterItem
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from .. import Parameter
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from ...Qt import QtWidgets
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class ListParameterItem(WidgetParameterItem):
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"""
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WidgetParameterItem subclass providing comboBox that lets the user select from a list of options.
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"""
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def __init__(self, param, depth):
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self.targetValue = None
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WidgetParameterItem.__init__(self, param, depth)
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def makeWidget(self):
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w = QtWidgets.QComboBox()
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w.setMaximumHeight(20) ## set to match height of spin box and line edit
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w.sigChanged = w.currentIndexChanged
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w.value = self.value
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w.setValue = self.setValue
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self.widget = w ## needs to be set before limits are changed
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self.limitsChanged(self.param, self.param.opts['limits'])
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if len(self.forward) > 0:
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self.setValue(self.param.value())
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return w
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def value(self):
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key = self.widget.currentText()
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return self.forward.get(key, None)
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def setValue(self, val):
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self.targetValue = val
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if val not in self.reverse[0]:
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self.widget.setCurrentIndex(0)
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else:
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key = self.reverse[1][self.reverse[0].index(val)]
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ind = self.widget.findText(key)
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self.widget.setCurrentIndex(ind)
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def limitsChanged(self, param, limits):
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# set up forward / reverse mappings for name:value
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if len(limits) == 0:
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limits = [''] ## Can never have an empty list--there is always at least a singhe blank item.
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self.forward, self.reverse = ListParameter.mapping(limits)
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try:
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self.widget.blockSignals(True)
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val = self.targetValue
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self.widget.clear()
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for k in self.forward:
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self.widget.addItem(k)
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if k == val:
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self.widget.setCurrentIndex(self.widget.count()-1)
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self.updateDisplayLabel()
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finally:
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self.widget.blockSignals(False)
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def updateDisplayLabel(self, value=None):
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if value is None:
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value = self.widget.currentText()
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super().updateDisplayLabel(value)
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class ListParameter(Parameter):
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"""Parameter with a list of acceptable values.
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By default, this parameter is represtented by a :class:`ListParameterItem`,
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displaying a combo box to select a value from the list.
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In addition to the generic :class:`~pyqtgraph.parametertree.Parameter`
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options, this parameter type accepts a ``limits`` argument specifying the
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list of allowed values. ``values`` is an alias and may be used instead.
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The values may generally be of any data type, as long as they can be
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represented as a string. If the string representation provided is
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undesirable, the values may be given as a dictionary mapping the desired
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string representation to the value.
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"""
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itemClass = ListParameterItem
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def __init__(self, **opts):
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self.forward = OrderedDict() ## {name: value, ...}
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self.reverse = ([], []) ## ([value, ...], [name, ...])
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# Parameter uses 'limits' option to define the set of allowed values
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if 'values' in opts:
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opts['limits'] = opts['values']
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if opts.get('limits', None) is None:
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opts['limits'] = []
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Parameter.__init__(self, **opts)
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self.setLimits(opts['limits'])
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def setLimits(self, limits):
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"""Change the list of allowed values."""
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self.forward, self.reverse = self.mapping(limits)
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Parameter.setLimits(self, limits)
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if len(self.reverse[0]) > 0 and self.value() not in self.reverse[0]:
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self.setValue(self.reverse[0][0])
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@staticmethod
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def mapping(limits):
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# Return forward and reverse mapping objects given a limit specification
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forward = OrderedDict() ## {name: value, ...}
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reverse = ([], []) ## ([value, ...], [name, ...])
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if isinstance(limits, dict):
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for k, v in limits.items():
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forward[k] = v
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reverse[0].append(v)
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reverse[1].append(k)
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else:
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for v in limits:
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n = str(v)
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forward[n] = v
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reverse[0].append(v)
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reverse[1].append(n)
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return forward, reverse
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