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# checkcombobox.py ---
#
# Filename: checkcombobox.py
# Description:
# Author:
# Maintainer:
# Created: Wed Jun 5 15:06:21 2013 (+0530)
# Version:
# Last-Updated: Wed Jun 5 18:42:50 2013 (+0530)
# By: subha
# Update #: 188
# URL:
# Keywords:
# Compatibility:
#
#
# Commentary:
#
# ComboBox with checkable items. Inspired by the same in libqxt.
#
#
# Change log:
#
#
#
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; either version 3, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; see the file COPYING. If not, write to
# the Free Software Foundation, Inc., 51 Franklin Street, Fifth
# Floor, Boston, MA 02110-1301, USA.
#
#
# Code:
import sys
from PyQt4 import QtCore, QtGui
from PyQt4.Qt import Qt
from collections import defaultdict
class CheckComboBoxModel(QtGui.QStandardItemModel):
"""This is inspired by Qxt library."""
checkStateChange = QtCore.pyqtSignal(name='checkStateChanged')
def __init__(self, *args):
QtGui.QStandardItemModel.__init__(self, *args)
self.checked_dict = defaultdict(int)
def flags(self, index):
return Qt.ItemIsUserCheckable | Qt.ItemIsSelectable | Qt.ItemIsEnabled
def data(self, index, role):
if index.isValid() and role == Qt.CheckStateRole:
return QtCore.QVariant(self.checked_dict[index])
else:
return QtGui.QStandardItemModel.data(self, index, role)
def setData(self, index, value, role=Qt.EditRole):
if not index.isValid():
return False
ok = QtGui.QStandardItemModel.setData(self, index, value, role)
if ok and role == Qt.CheckStateRole:
self.checked_dict[index] = value.toInt()[0]
self.dataChanged.emit(index, index)
self.checkStateChange.emit()
return ok
class ComboEventFilter(QtCore.QObject):
"""Event filter for CheckComboBox - inspired by Qxt library"""
def __init__(self, parent):
QtCore.QObject.__init__(self, parent)
def eventFilter(self, obj, event):
etype = event.type()
if etype == event.KeyPress or etype == event.KeyRelease:
if obj == self and \
(event.key() == Qt.Key_UP or
event.key() == Qt.Key_Down):
self.parent().showPopup()
return True
elif event.key() == Qt.Key_Enter or \
event.key() == Qt.Key_Return or \
event.key() == Qt.Key_Escape:
QtGui.QComboBox.hidePopup(self.parent())
if event.key() != Qt.Key_Escape:
return True
elif etype == event.MouseButtonPress:
self.parent()._containerMousePress = (obj == self.parent().view().window())
elif etype == event.MouseButtonRelease:
self.parent()._containerMousePress = False
return False
class CheckComboBox(QtGui.QComboBox):
"""Specialization of QComboBox to allow checkable items. This is
inspired by the same class in Qxt"""
def __init__(self, *args):
QtGui.QComboBox.__init__(self, *args)
self._containerMousePress = False
self.setModel(CheckComboBoxModel())
self.activated.connect(self.toggleCheckState)
self.ef = ComboEventFilter(self)
self.view().installEventFilter(self.ef)
self.view().window().installEventFilter(self.ef)
self.view().viewport().installEventFilter(self.ef)
self.installEventFilter(self.ef)
def hidePopup(self):
"""This is to disable hiding of the popup when an item is clicked."""
if self._containerMousePress:
QtGui.QComboBox.hidePopup(self)
def itemCheckState(self, index):
return self.itemData(index, Qt.CheckStateRole).toInt()[0]
def setItemCheckState(self, index, state):
self.setItemData(index, QtCore.QVariant(state), QtCore.Qt.CheckStateRole)
def checkedItems(self):
index = self.model().index(0,0)
checked = self.model().match(index, Qt.CheckStateRole, Qt.Checked, -1, Qt.MatchExactly)
return [index.data().toString() for index in checked]
def setCheckedItems(self, textItemList):
for text in textItemList:
index = self.findText(text)
if index.isValid():
self.setItemCheckState(index, Qt.Checked)
else:
self.setItemCheckState(index, Qt.Unchecked)
def toggleCheckState(self, index):
value = self.itemData(index, Qt.CheckStateRole)
if value.isValid():
state = value.toInt()[0]
if state == Qt.Checked:
self.setItemData(index, Qt.Unchecked, Qt.CheckStateRole)
else:
self.setItemData(index, Qt.Checked, Qt.CheckStateRole)
def main():
"""Test main: load a model and display the tree for it"""
app = QtGui.QApplication([])
mainwin = QtGui.QMainWindow()
mainwin.setWindowTitle('CheckComboBox test')
box = CheckComboBox()
for ii in range(5):
box.addItem('myitem_%d' % (ii))
mainwin.setCentralWidget(box)
mainwin.show()
sys.exit(app.exec_())
if __name__ == '__main__':
main()
#
# checkcombobox.py ends here