PyQt Enable / Disable Items in QComboBox
I have a QComboBox that lists all Windows drive letters and lets you choose among them. At runtime, we need to enable or disable some letters (without removing them).
Here's the basic code:
all_letters = ["{}:".format(chr(i)) for i in range(90, 64, -1)] # Z: -> A:
all_letters.insert(0, "")
cb_letter = QtGui.QComboBox()
for l in all_letters:
cb_letter.addItem(l)
cb_letter.setCurrentIndex(0)
I could find some solution (which sounds very complicated) by simply disabling recording here , but was unable to enable it.
What would be the best way to enable or disable any QComboBox entry?
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By default it QComboBox
uses QStandardItemModel
, so all convenience methods QStandardItem
are available:
cb_letter.model().item(2).setEnabled(False)
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Note: ekhumoro's answer above is probably all you need! Look no further unless you have reason to want to use QAbstractItemModel instead of QStandardItemModel.
Note 2: This is by no means a universal list model. It only intended for a specific QComboBox in one of my applications. It should be modified as intended.
... Anyway, I solved this problem by subclassing QAbstractListModel and then calling QComboBox.setModel (mylistmodel). My ListModel looks like this:
from PySide import QtCore
class ListModel(QtCore.QAbstractListModel):
"""
Class for list management with a QAbstractListModel.
Implements required virtual methods rowCount() and data().
Resizeable ListModels must implement insertRows(), removeRows().
If a nicely labeled header is desired, implement headerData().
"""
def __init__(self,input_list=[],parent=None):
super(ListModel,self).__init__(parent)
self.list_data = []
self.enabled = []
for thing in input_list:
self.append_item(thing)
def append_item(self,thing):
ins_row = self.rowCount()
self.beginInsertRows(QtCore.QModelIndex(),ins_row,ins_row+1)
self.list_data.append(thing)
self.enabled.append(True)
self.endInsertRows()
def remove_item(self,idx):
del_row = idx.row()
self.beginRemoveRows(QtCore.QModelIndex(),del_row,del_row)
self.list_data.pop(del_row)
self.enabled.pop(del_row)
self.endRemoveRows()
def set_disabled(self,row):
self.enabled[row] = False
def flags(self,idx):
if self.enabled[idx.row()]:
return QtCore.Qt.ItemIsEnabled | QtCore.Qt.ItemIsSelectable
else:
return QtCore.Qt.NoItemFlags
def rowCount(self,parent=QtCore.QModelIndex()):
return len(self.list_data)
def data(self,idx,data_role):
return self.list_data[idx.row()]
def insertRows(self,row,count):
self.beginInsertRows(QtCore.QModelIndex(),row,row+count-1)
for j in range(row,row+count):
self.list_data.insert(j,None)
self.endInsertRows()
def removeRows(self, row, count, parent=QtCore.QModelIndex()):
self.beginRemoveRows(parent,row,row+count-1)
for j in range(row,row+count)[::-1]:
self.list_items.pop(j)
self.endRemoveRows()
def headerData(self,section,orientation,data_role):
return None
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