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""" A simple list box widget with a model-view architecture. """
from __future__ import absolute_import
# Major package imports.
import wx
# Enthought library imports.
from traits.api import Event, Instance, Int
# Local imports.
from pyface.list_box_model import ListBoxModel
from .widget import Widget
class ListBox(Widget):
""" A simple list box widget with a model-view architecture. """
# The model that provides the data for the list box.
model = Instance(ListBoxModel)
# The objects currently selected in the list.
selection = Int(-1)
# Events.
# An item has been activated.
item_activated = Event
# Default style.
STYLE = wx.LB_SINGLE | wx.LB_HSCROLL | wx.LB_NEEDED_SB
def __init__(self, parent, **traits):
""" Creates a new list box. """
# Base-class constructors.
super(ListBox, self).__init__(**traits)
# Create the widget!
self._create_control(parent)
# Listen for changes to the model.
self.model.on_trait_change(self._on_model_changed, "list_changed")
return
def dispose(self):
self.model.on_trait_change(self._on_model_changed, "list_changed",
remove = True)
self.model.dispose()
return
###########################################################################
# 'ListBox' interface.
###########################################################################
def refresh(self):
""" Refreshes the list box. """
# For now we just clear out the entire list.
self.control.Clear()
# Populate the list.
self._populate()
return
###########################################################################
# wx event handlers.
###########################################################################
def _on_item_selected(self, event):
""" Called when an item in the list is selected. """
listbox = event.GetEventObject()
self.selection = listbox.GetSelection()
return
def _on_item_activated(self, event):
""" Called when an item in the list is activated. """
listbox = event.GetEventObject()
index = listbox.GetSelection()
# Trait event notification.
self.item_activated = index
return
###########################################################################
# Trait handlers.
###########################################################################
#### Static ###############################################################
def _selection_changed(self, index):
""" Called when the selected item is changed. """
if index != -1:
self.control.SetSelection(index)
return
#### Dynamic ##############################################################
def _on_model_changed(self, event):
""" Called when the model has changed. """
# For now we just clear out the entire list.
self.refresh()
return
###########################################################################
# Private interface.
###########################################################################
def _create_control(self, parent):
""" Creates the widget. """
self.control = wx.ListBox(parent, -1, style = self.STYLE)
# Wire it up!
wx.EVT_LISTBOX(self.control, self.control.GetId(),
self._on_item_selected)
wx.EVT_LISTBOX_DCLICK(self.control, self.control.GetId(),
self._on_item_activated)
# Populate the list.
self._populate()
return
def _populate(self):
""" Populates the list box. """
for index in range(self.model.get_item_count()):
label, item = self.model.get_item_at(index)
self.control.Append(label, item)
return
#### EOF ######################################################################
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