#------------------------------------------------------------------------------
# Copyright (c) 2012, Enthought, Inc.
# All rights reserved.
#------------------------------------------------------------------------------
from .qt.QtGui import QComboBox
from .qt_control import QtControl
[docs]class QtComboBox(QtControl):
""" A Qt implementation of an Enaml ComboBox.
"""
#--------------------------------------------------------------------------
# Setup Methods
#--------------------------------------------------------------------------
[docs] def create_widget(self, parent, tree):
""" Create the underlying combo box widget.
"""
box = QComboBox(parent)
box.setInsertPolicy(QComboBox.NoInsert)
return box
[docs] def create(self, tree):
""" Create and initialize the underlying widget.
"""
super(QtComboBox, self).create(tree)
self.set_items(tree['items'])
self.set_index(tree['index'])
self.set_editable(tree['editable'])
self.widget().currentIndexChanged.connect(self.on_index_changed)
#--------------------------------------------------------------------------
# Message Handlers
#--------------------------------------------------------------------------
[docs] def on_action_set_index(self, content):
""" Handle the 'set_index' action from the Enaml widget.
"""
self.set_index(content['index'])
[docs] def on_action_set_items(self, content):
""" Handle the 'set_items' action from the Enaml widget.
"""
self.set_items(content['items'])
[docs] def on_action_set_editable(self, content):
""" Handle the 'set_editable' action from the Enaml widget.
"""
self.set_editable(content['editable'])
# The update is needed to avoid artificats (at least on Windows)
self.widget().update()
#--------------------------------------------------------------------------
# Signal Handlers
#--------------------------------------------------------------------------
[docs] def on_index_changed(self):
""" The signal handler for the index changed signal.
"""
if 'index' not in self.loopback_guard:
content = {'index': self.widget().currentIndex()}
self.send_action('index_changed', content)
#--------------------------------------------------------------------------
# Widget Update Methods
#--------------------------------------------------------------------------
[docs] def set_items(self, items):
""" Set the items of the ComboBox.
"""
widget = self.widget()
count = widget.count()
nitems = len(items)
for idx, item in enumerate(items[:count]):
widget.setItemText(idx, item)
if nitems > count:
for item in items[count:]:
widget.addItem(item)
elif nitems < count:
for idx in reversed(range(nitems, count)):
widget.removeItem(idx)
[docs] def set_index(self, index):
""" Set the current index of the ComboBox.
"""
with self.loopback_guard('index'):
self.widget().setCurrentIndex(index)
[docs] def set_editable(self, editable):
""" Set whether the combo box is editable.
"""
self.widget().setEditable(editable)