458 lines
13 KiB
Python
458 lines
13 KiB
Python
# Based on iwidgets2.2.0/entryfield.itk code.
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import re
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import string
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import types
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import Tkinter
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import Pmw
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# Possible return values of validation functions.
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OK = 1
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ERROR = 0
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PARTIAL = -1
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class EntryField(Pmw.MegaWidget):
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_classBindingsDefinedFor = 0
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def __init__(self, parent = None, **kw):
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# Define the megawidget options.
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INITOPT = Pmw.INITOPT
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optiondefs = (
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('command', None, None),
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('errorbackground', 'pink', None),
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('invalidcommand', self.bell, None),
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('labelmargin', 0, INITOPT),
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('labelpos', None, INITOPT),
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('modifiedcommand', None, None),
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('sticky', 'ew', INITOPT),
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('validate', None, self._validate),
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('extravalidators', {}, None),
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('value', '', INITOPT),
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)
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self.defineoptions(kw, optiondefs)
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# Initialise the base class (after defining the options).
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Pmw.MegaWidget.__init__(self, parent)
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# Create the components.
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interior = self.interior()
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self._entryFieldEntry = self.createcomponent('entry',
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(), None,
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Tkinter.Entry, (interior,))
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self._entryFieldEntry.grid(column=2, row=2, sticky=self['sticky'])
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if self['value'] != '':
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self.__setEntry(self['value'])
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interior.grid_columnconfigure(2, weight=1)
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interior.grid_rowconfigure(2, weight=1)
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self.createlabel(interior)
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# Initialise instance variables.
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self.normalBackground = None
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self._previousText = None
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# Initialise instance.
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_registerEntryField(self._entryFieldEntry, self)
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# Establish the special class bindings if not already done.
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# Also create bindings if the Tkinter default interpreter has
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# changed. Use Tkinter._default_root to create class
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# bindings, so that a reference to root is created by
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# bind_class rather than a reference to self, which would
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# prevent object cleanup.
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if EntryField._classBindingsDefinedFor != Tkinter._default_root:
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tagList = self._entryFieldEntry.bindtags()
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root = Tkinter._default_root
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allSequences = {}
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for tag in tagList:
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sequences = root.bind_class(tag)
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if type(sequences) is types.StringType:
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# In old versions of Tkinter, bind_class returns a string
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sequences = root.tk.splitlist(sequences)
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for sequence in sequences:
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allSequences[sequence] = None
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for sequence in allSequences.keys():
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root.bind_class('EntryFieldPre', sequence, _preProcess)
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root.bind_class('EntryFieldPost', sequence, _postProcess)
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EntryField._classBindingsDefinedFor = root
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self._entryFieldEntry.bindtags(('EntryFieldPre',) +
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self._entryFieldEntry.bindtags() + ('EntryFieldPost',))
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self._entryFieldEntry.bind('<Return>', self._executeCommand)
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# Check keywords and initialise options.
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self.initialiseoptions()
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def destroy(self):
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_deregisterEntryField(self._entryFieldEntry)
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Pmw.MegaWidget.destroy(self)
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def _getValidatorFunc(self, validator, index):
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# Search the extra and standard validator lists for the
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# given 'validator'. If 'validator' is an alias, then
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# continue the search using the alias. Make sure that
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# self-referencial aliases do not cause infinite loops.
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extraValidators = self['extravalidators']
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traversedValidators = []
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while 1:
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traversedValidators.append(validator)
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if extraValidators.has_key(validator):
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validator = extraValidators[validator][index]
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elif _standardValidators.has_key(validator):
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validator = _standardValidators[validator][index]
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else:
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return validator
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if validator in traversedValidators:
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return validator
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def _validate(self):
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dict = {
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'validator' : None,
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'min' : None,
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'max' : None,
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'minstrict' : 1,
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'maxstrict' : 1,
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}
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opt = self['validate']
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if type(opt) is types.DictionaryType:
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dict.update(opt)
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else:
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dict['validator'] = opt
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# Look up validator maps and replace 'validator' field with
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# the corresponding function.
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validator = dict['validator']
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valFunction = self._getValidatorFunc(validator, 0)
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self._checkValidateFunction(valFunction, 'validate', validator)
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dict['validator'] = valFunction
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# Look up validator maps and replace 'stringtovalue' field
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# with the corresponding function.
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if dict.has_key('stringtovalue'):
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stringtovalue = dict['stringtovalue']
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strFunction = self._getValidatorFunc(stringtovalue, 1)
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self._checkValidateFunction(
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strFunction, 'stringtovalue', stringtovalue)
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else:
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strFunction = self._getValidatorFunc(validator, 1)
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if strFunction == validator:
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strFunction = len
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dict['stringtovalue'] = strFunction
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self._validationInfo = dict
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args = dict.copy()
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del args['validator']
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del args['min']
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del args['max']
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del args['minstrict']
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del args['maxstrict']
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del args['stringtovalue']
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self._validationArgs = args
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self._previousText = None
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if type(dict['min']) == types.StringType and strFunction is not None:
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dict['min'] = apply(strFunction, (dict['min'],), args)
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if type(dict['max']) == types.StringType and strFunction is not None:
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dict['max'] = apply(strFunction, (dict['max'],), args)
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self._checkValidity()
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def _checkValidateFunction(self, function, option, validator):
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# Raise an error if 'function' is not a function or None.
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if function is not None and not callable(function):
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extraValidators = self['extravalidators']
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extra = extraValidators.keys()
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extra.sort()
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extra = tuple(extra)
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standard = _standardValidators.keys()
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standard.sort()
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standard = tuple(standard)
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msg = 'bad %s value "%s": must be a function or one of ' \
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'the standard validators %s or extra validators %s'
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raise ValueError, msg % (option, validator, standard, extra)
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def _executeCommand(self, event = None):
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cmd = self['command']
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if callable(cmd):
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if event is None:
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# Return result of command for invoke() method.
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return cmd()
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else:
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cmd()
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def _preProcess(self):
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self._previousText = self._entryFieldEntry.get()
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self._previousICursor = self._entryFieldEntry.index('insert')
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self._previousXview = self._entryFieldEntry.index('@0')
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if self._entryFieldEntry.selection_present():
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self._previousSel= (self._entryFieldEntry.index('sel.first'),
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self._entryFieldEntry.index('sel.last'))
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else:
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self._previousSel = None
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def _postProcess(self):
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# No need to check if text has not changed.
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previousText = self._previousText
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if previousText == self._entryFieldEntry.get():
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return self.valid()
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valid = self._checkValidity()
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if self.hulldestroyed():
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# The invalidcommand called by _checkValidity() destroyed us.
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return valid
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cmd = self['modifiedcommand']
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if callable(cmd) and previousText != self._entryFieldEntry.get():
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cmd()
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return valid
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def checkentry(self):
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# If there is a variable specified by the entry_textvariable
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# option, checkentry() should be called after the set() method
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# of the variable is called.
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self._previousText = None
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return self._postProcess()
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def _getValidity(self):
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text = self._entryFieldEntry.get()
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dict = self._validationInfo
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args = self._validationArgs
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if dict['validator'] is not None:
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status = apply(dict['validator'], (text,), args)
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if status != OK:
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return status
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# Check for out of (min, max) range.
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if dict['stringtovalue'] is not None:
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min = dict['min']
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max = dict['max']
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if min is None and max is None:
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return OK
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val = apply(dict['stringtovalue'], (text,), args)
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if min is not None and val < min:
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if dict['minstrict']:
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return ERROR
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else:
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return PARTIAL
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if max is not None and val > max:
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if dict['maxstrict']:
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return ERROR
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else:
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return PARTIAL
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return OK
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def _checkValidity(self):
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valid = self._getValidity()
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oldValidity = valid
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if valid == ERROR:
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# The entry is invalid.
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cmd = self['invalidcommand']
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if callable(cmd):
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cmd()
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if self.hulldestroyed():
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# The invalidcommand destroyed us.
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return oldValidity
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# Restore the entry to its previous value.
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if self._previousText is not None:
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self.__setEntry(self._previousText)
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self._entryFieldEntry.icursor(self._previousICursor)
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self._entryFieldEntry.xview(self._previousXview)
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if self._previousSel is not None:
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self._entryFieldEntry.selection_range(self._previousSel[0],
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self._previousSel[1])
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# Check if the saved text is valid as well.
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valid = self._getValidity()
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self._valid = valid
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if self.hulldestroyed():
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# The validator or stringtovalue commands called by
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# _checkValidity() destroyed us.
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return oldValidity
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if valid == OK:
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if self.normalBackground is not None:
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self._entryFieldEntry.configure(
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background = self.normalBackground)
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self.normalBackground = None
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else:
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if self.normalBackground is None:
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self.normalBackground = self._entryFieldEntry.cget('background')
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self._entryFieldEntry.configure(
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background = self['errorbackground'])
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return oldValidity
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def invoke(self):
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return self._executeCommand()
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def valid(self):
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return self._valid == OK
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def clear(self):
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self.setentry('')
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def __setEntry(self, text):
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oldState = str(self._entryFieldEntry.cget('state'))
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if oldState != 'normal':
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self._entryFieldEntry.configure(state='normal')
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self._entryFieldEntry.delete(0, 'end')
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self._entryFieldEntry.insert(0, text)
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if oldState != 'normal':
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self._entryFieldEntry.configure(state=oldState)
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def setentry(self, text):
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self._preProcess()
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self.__setEntry(text)
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return self._postProcess()
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def getvalue(self):
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return self._entryFieldEntry.get()
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def setvalue(self, text):
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return self.setentry(text)
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Pmw.forwardmethods(EntryField, Tkinter.Entry, '_entryFieldEntry')
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# ======================================================================
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# Entry field validation functions
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_numericregex = re.compile('^[0-9]*$')
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_alphabeticregex = re.compile('^[a-z]*$', re.IGNORECASE)
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_alphanumericregex = re.compile('^[0-9a-z]*$', re.IGNORECASE)
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def numericvalidator(text):
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if text == '':
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return PARTIAL
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else:
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if _numericregex.match(text) is None:
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return ERROR
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else:
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return OK
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def integervalidator(text):
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if text in ('', '-', '+'):
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return PARTIAL
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try:
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string.atol(text)
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return OK
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except ValueError:
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return ERROR
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def alphabeticvalidator(text):
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if _alphabeticregex.match(text) is None:
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return ERROR
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else:
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return OK
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def alphanumericvalidator(text):
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if _alphanumericregex.match(text) is None:
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return ERROR
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else:
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return OK
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def hexadecimalvalidator(text):
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if text in ('', '0x', '0X', '+', '+0x', '+0X', '-', '-0x', '-0X'):
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return PARTIAL
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try:
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string.atol(text, 16)
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return OK
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except ValueError:
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return ERROR
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def realvalidator(text, separator = '.'):
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if separator != '.':
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if string.find(text, '.') >= 0:
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return ERROR
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index = string.find(text, separator)
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if index >= 0:
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text = text[:index] + '.' + text[index + 1:]
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try:
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string.atof(text)
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return OK
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except ValueError:
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# Check if the string could be made valid by appending a digit
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# eg ('-', '+', '.', '-.', '+.', '1.23e', '1E-').
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if len(text) == 0:
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return PARTIAL
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if text[-1] in string.digits:
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return ERROR
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try:
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string.atof(text + '0')
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return PARTIAL
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except ValueError:
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return ERROR
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def timevalidator(text, separator = ':'):
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try:
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Pmw.timestringtoseconds(text, separator)
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return OK
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except ValueError:
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if len(text) > 0 and text[0] in ('+', '-'):
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text = text[1:]
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if re.search('[^0-9' + separator + ']', text) is not None:
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return ERROR
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return PARTIAL
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def datevalidator(text, format = 'ymd', separator = '/'):
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try:
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Pmw.datestringtojdn(text, format, separator)
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return OK
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except ValueError:
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if re.search('[^0-9' + separator + ']', text) is not None:
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return ERROR
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return PARTIAL
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_standardValidators = {
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'numeric' : (numericvalidator, string.atol),
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'integer' : (integervalidator, string.atol),
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'hexadecimal' : (hexadecimalvalidator, lambda s: string.atol(s, 16)),
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'real' : (realvalidator, Pmw.stringtoreal),
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'alphabetic' : (alphabeticvalidator, len),
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'alphanumeric' : (alphanumericvalidator, len),
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'time' : (timevalidator, Pmw.timestringtoseconds),
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'date' : (datevalidator, Pmw.datestringtojdn),
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}
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_entryCache = {}
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def _registerEntryField(entry, entryField):
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# Register an EntryField widget for an Entry widget
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_entryCache[entry] = entryField
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def _deregisterEntryField(entry):
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# Deregister an Entry widget
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del _entryCache[entry]
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def _preProcess(event):
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# Forward preprocess events for an Entry to it's EntryField
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_entryCache[event.widget]._preProcess()
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def _postProcess(event):
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# Forward postprocess events for an Entry to it's EntryField
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# The function specified by the 'command' option may have destroyed
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# the megawidget in a binding earlier in bindtags, so need to check.
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if _entryCache.has_key(event.widget):
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_entryCache[event.widget]._postProcess()
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