我有一个从QCombobox底层自定义列表模型（派生自QAbstractListModel）派生的自定义类。该模型允许用户从选项中进行多项选择（通过检查成员）。组合框是从在派生实例QItemDelegate上工作的委托（派生自 ）创建的。QAbstractTableModel这个想法是，从选择中，表模型将选择存储为包含选择成员的列表，并将其显示为列表的字符串表示形式。
到目前为止，我的实现工作，但我还没有能够完成两件事：
- 用户在完成者上插入文本后，显示的结果列表未按字母顺序排序（在完成者的弹出窗口上）。
- 每次我单击完成者的输出列表（弹出窗口）时，视图都会隐藏/关闭（我不确定是哪一个），这会阻止一次选择多个项目。
这是我的实现的一个简短（pyside）示例：
from PySide.QtCore import *
from PySide.QtGui import *
class MyCombobox(QComboBox):
def __init__(self, parent = None):
super(MyCombobox, self).__init__(parent)
self.setFocusPolicy(Qt.StrongFocus)
self.setEditable(True)
self.filter = QSortFilterProxyModel(self)
self.filter.setFilterCaseSensitivity(Qt.CaseInsensitive)
self.completer = QCompleter(self.filter, self)
self.completer.setCompletionMode(QCompleter.UnfilteredPopupCompletion)
self.completer.setModelSorting(QCompleter.CaseInsensitivelySortedModel)
self.setCompleter(self.completer)
#signals
self.activated.connect(self._comboActivated)
self.lineEdit().textEdited[unicode].connect(self.filter.setFilterFixedString)
self.completer.activated['QModelIndex'].connect(self._completerActivated)
self._pressed = True
def _completerActivated(self, index):
if index.isValid():
self._itemPressed(index)
def setModel(self, model):
super(MyCombobox, self).setModel(model)
self.filter.setSourceModel(model)
self.completer.setModel(self.filter)
def _itemPressed(self, index):
row = index.row()
col = index.column()
index2 = self.filter.index(row, col)
index = self.filter.mapToSource(index2)
model = self.model()
state = model.data(index, role = Qt.CheckStateRole)
if state == Qt.Checked:
model.setData(index, Qt.Unchecked, Qt.CheckStateRole)
self._pressed = True
return
elif state == Qt.Unchecked:
model.setData(index, Qt.Checked, Qt.CheckStateRole)
self._pressed = True
return
else:
self._pressed = False
return
def _comboActivated(self, pos):
model = self.model()
index = model.index(pos, 0)
state = model.data(index, role = Qt.CheckStateRole)
if state == Qt.Checked:
model.setData(index, Qt.Unchecked, Qt.CheckStateRole)
self._pressed = True
return
elif state == Qt.Unchecked:
model.setData(index, Qt.Checked, Qt.CheckStateRole)
self._pressed = True
return
else:
self._pressed = False
return
def hidePopup(self):
if not self._pressed:
super(MyCombobox, self).hidePopup()
self._pressed = True
else:
self._pressed = False
class MyDelegate(QItemDelegate):
def __init__(self, parent = None):
super(MyDelegate, self).__init__(parent)
def createEditor(self, parent, option, index):
cb = MyCombobox(parent)
tableModel = index.model()
sel = tableModel._table[0][0]
model = MyModel(parent)
for k, name in enumerate(model._base):
model._checked[k] = name in sel
cb.setModel(model)
return cb
def setModelData(self, editor, model, index):
mymodel = editor.model()
sel = mymodel._checked
base = mymodel._base
myselection = [ name for k, name in enumerate(base) if sel[k] ]
model.setData(index, myselection, role = Qt.DisplayRole)
class MyModel(QAbstractListModel):
def __init__(self, parent = None):
super(MyModel, self).__init__(parent)
self._base = ["one", "two", "three", "four", "five"]
self._checked = [False for k in range(len(self._base))]
def rowCount(self, index = None):
return len(self._base)
def data(self, index, role = Qt.DisplayRole):
i = index.row()
if 0 <= i < self.rowCount():
if role == Qt.DisplayRole:
return self._base[i]
elif role == Qt.CheckStateRole:
if self._checked[i]:
return Qt.Checked
else:
return Qt.Unchecked
else:
pass
else:
pass
def setData(self, index, value, role = Qt.CheckStateRole):
i = index.row()
if 0 <= i < self.rowCount():
if role == Qt.CheckStateRole:
self._checked[i] = value == Qt.Checked
self.dataChanged.emit(index, index)
return True
else:
return super(MyModel, self).setData(index, value, role)
else:
return False
def flags(self, index):
return Qt.ItemIsEnabled | Qt.ItemIsSelectable | Qt.ItemIsUserCheckable
class MyTableModel(QAbstractTableModel):
def __init__(self, table, parent = None):
super(MyTableModel, self).__init__(parent)
self._table = table
def rowCount(self, index = None):
return len(self._table)
def columnCount(self, index = None):
if self._table: return len(self._table[0])
return 0
def data(self, index, role = Qt.DisplayRole):
i, j = index.row(), index.column()
if role == Qt.DisplayRole:
return unicode(self._table[i][j])
def setData(self, index, value, role = Qt.DisplayRole):
i, j = index.row(), index.column()
if role == Qt.DisplayRole:
self._table[i][j] = value
def flags(self, index):
return Qt.ItemIsEnabled | Qt.ItemIsSelectable | Qt.ItemIsEditable
if __name__ == '__main__':
app = QApplication("test")
tableView = QTableView()
model = MyTableModel([[["numbers"]]])
tableView.setModel(model)
delegate = MyDelegate(tableView)
tableView.setItemDelegate(delegate)
tableView.show();
app.exec_()