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"""
"""
from . import widget
class Form(widget.Widget):
"""A form that automatically will contain all named widgets.
After a form is created, all named widget that are subsequently created are
added to that form. You may use dict style access to access named widgets.
Example:
f = gui.Form()
w = gui.Input("Phil",name="firstname")
w = gui.Input("Hassey",name="lastname")
print f.results()
print ''
print f.items()
print ''
print f['firstname'].value
print f['lastname'].value
"""
# The current form instance
form = None
# The list of PGU widgets that are tracked by this form
_elist = None
# A mapping of PGU widgets tracked by this form (name -> instance)
_emap = None
# The dirty flag is set when a new widget is added to the form
_dirty = 0
def __init__(self):
widget.Widget.__init__(self,decorate=False)
self._elist = []
self._emap = {}
self._dirty = 0
# Register this form as the one used by new widgets
Form.form = self
def add(self,e,name=None,value=None):
"""Adds a PGU widget to this form"""
if name != None: e.name = name
if value != None: e.value = value
self._elist.append(e)
self._dirty = 1
def _clean(self):
# Remove elements from our list if they no longer have an assigned name
for e in self._elist[:]:
if not hasattr(e,'name') or e.name == None:
self._elist.remove(e)
# Update the name-to-widget mapping
self._emap = {}
for e in self._elist:
self._emap[e.name] = e
self._dirty = 0
def __getitem__(self,k):
"""Returns the widget instance given the name of the widget"""
if self._dirty: self._clean()
return self._emap[k]
def __contains__(self,k):
"""Returns true if this form contains the named widget"""
if self._dirty: self._clean()
if k in self._emap: return True
return False
def results(self):
"""Return a dict of name, widget-value pairs."""
if self._dirty: self._clean()
r = {}
for e in self._elist:
# Make sure the widget has a 'value' (eg tables do not)
if (hasattr(e, "value")):
r[e.name] = e.value
else:
r[e.name] = None
return r
def items(self):
"""Return a list of name, widget pairs."""
return self.results().items()
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