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109 lines
3.5 KiB
Python
109 lines
3.5 KiB
Python
# Created On: 2012/01/23
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# Copyright 2013 Hardcoded Software (http://www.hardcoded.net)
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#
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# This software is licensed under the "BSD" License as described in the "LICENSE" file,
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# which should be included with this package. The terms are also available at
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# http://www.hardcoded.net/licenses/bsd_license
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from .base import GUIObject
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from ..util import nonone
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class TextFieldView:
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"""Expected interface for :class:`TextField`'s view.
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*Not actually used in the code. For documentation purposes only.*
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Our view is expected to sync with :attr:`TextField.text` "both ways", that is, update the
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model's text when the user types something, but also update the text field when :meth:`refresh`
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is called.
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"""
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def refresh(self):
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"""Refreshes the contents of the input widget.
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Ensures that the contents of the input widget is actually :attr:`TextField.text`.
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"""
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class TextField(GUIObject):
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"""Cross-toolkit text field.
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Represents a UI element allowing the user to input a text value. Its main attribute is
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:attr:`text` which acts as the store of the said value.
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When our model value isn't a string, we have a built-in parsing/formatting mechanism allowing
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us to directly retrieve/set our non-string value through :attr:`value`.
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Subclasses :class:`.GUIObject`. Expected view: :class:`TextFieldView`.
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"""
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def __init__(self):
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GUIObject.__init__(self)
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self._text = ''
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self._value = None
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#--- Virtual
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def _parse(self, text):
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"""(Virtual) Parses ``text`` to put into :attr:`value`.
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Returns the parsed version of ``text``. Called whenever :attr:`text` changes.
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"""
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return text
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def _format(self, value):
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"""(Virtual) Formats ``value`` to put into :attr:`text`.
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Returns the formatted version of ``value``. Called whenever :attr:`value` changes.
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"""
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return value
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def _update(self, newvalue):
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"""(Virtual) Called whenever we have a new value.
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Whenever our text/value store changes to a new value (different from the old one), this
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method is called. By default, it does nothing but you can override it if you want.
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"""
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#--- Override
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def _view_updated(self):
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self.view.refresh()
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#--- Public
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def refresh(self):
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"""Triggers a view :meth:`~TextFieldView.refresh`.
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"""
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self.view.refresh()
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@property
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def text(self):
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"""The text that is currently displayed in the widget.
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*str*. *get/set*.
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This property can be set. When it is, :meth:`refresh` is called and the view is synced with
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our value. Always in sync with :attr:`value`.
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"""
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return self._text
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@text.setter
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def text(self, newtext):
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self.value = self._parse(nonone(newtext, ''))
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@property
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def value(self):
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"""The "parsed" representation of :attr:`text`.
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*arbitrary type*. *get/set*.
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By default, it's a mirror of :attr:`text`, but a subclass can override :meth:`_parse` and
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:meth:`_format` to have anything else. Always in sync with :attr:`text`.
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"""
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return self._value
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@value.setter
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def value(self, newvalue):
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if newvalue == self._value:
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return
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self._value = newvalue
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self._text = self._format(newvalue)
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self._update(self._value)
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self.refresh()
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