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from Source import Source
from Components.Element import cached
class List(Source, object):
"""The datasource of a listbox. Currently, the format depends on the used converter. So
if you put a simple string list in here, you need to use a StringList converter, if you are
using a "multi content list styled"-list, you need to use the StaticMultiList converter, and
setup the "fonts".
This has been done so another converter could convert the list to a different format, for example
to generate HTML."""
def __init__(self, list = [ ], enableWrapAround = False, item_height = 25, fonts = [ ]):
Source.__init__(self)
self.__list = list
self.onSelectionChanged = [ ]
self.item_height = item_height
self.fonts = fonts
self.disable_callbacks = False
self.enableWrapAround = enableWrapAround
self.__style = "default" # style might be an optional string which can be used to define different visualisations in the skin
def setList(self, list):
self.__list = list
self.changed((self.CHANGED_ALL,))
list = property(lambda self: self.__list, setList)
def entry_changed(self, index):
if not self.disable_callbacks:
self.downstream_elements.entry_changed(self, index)
def modifyEntry(self, index, data):
self.__list[index] = data
self.entry_changed(index)
def count(self):
return len(self.__list)
def selectionChanged(self, index):
if self.disable_callbacks:
return
# update all non-master targets
for x in self.downstream_elements:
if x is not self.master:
x.index = index
for x in self.onSelectionChanged:
x()
@cached
def getCurrent(self):
return self.master is not None and self.master.current
current = property(getCurrent)
def setIndex(self, index):
if self.master is not None:
self.master.index = index
self.selectionChanged(index)
@cached
def getIndex(self):
if self.master is not None:
return self.master.index
else:
return None
setCurrentIndex = setIndex
index = property(getIndex, setIndex)
def selectNext(self):
if self.getIndex() + 1 >= self.count():
if self.enableWrapAround:
self.index = 0
else:
self.index += 1
self.setIndex(self.index)
def selectPrevious(self):
if self.getIndex() - 1 < 0:
if self.enableWrapAround:
self.index = self.count() - 1
else:
self.index -= 1
self.setIndex(self.index)
@cached
def getStyle(self):
return self.__style
def setStyle(self, style):
self.__style = style
self.changed((self.CHANGED_SPECIFIC, "style"))
style = property(getStyle, setStyle)
def updateList(self, list):
"""Changes the list without changing the selection or emitting changed Events"""
assert len(list) == len(self.__list)
old_index = self.index
self.disable_callbacks = True
self.list = list
self.index = old_index
self.disable_callbacks = False
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