我实现了以下委托,以在 QTableView 中提供一个组合框。用例是用文本等价物替换通常对用户无意义的列(键)(例如数字 id)。
下面的代码片段有效(也用于保存正确的值),但它有三个问题:
- 它显示原始值,而不是等效的文本。
- QTableView 中的一系列行提供了所有列,但不提供具有此委托的列。
- 理想情况下,我希望组合框显示为这样,而用户不必单击它来找出它是一个。
注意:键可以是任何字符串(不一定是整数)。一个典型的例子是国家(值“France”对应于键“FR”)。
class ComboDelegate(QtGui.QItemDelegate):
"""
A delegate that places a QComboBox in every
cell of the column to which it is being applied
"""
def __init__(self, parent, value_data):
"Value_data is a list of tuples: (item, label)"
QtGui.QItemDelegate.__init__(self, parent)
self.value_data = value_data
@property
def items(self):
"The list of items for display"
return [item[0] for item in self.value_data]
@property
def labels(self):
"The list of labels for display"
return [item[1] for item in self.value_data]
def item(self, label):
"Get the item from a label"
try:
index = self.labels.index(label)
except ValueError:
pass
print("Value no: &%s" % index)
return self.items[index]
def createEditor(self, parent, option, index):
"Create the editor (called each time)"
combo = QtGui.QComboBox(parent)
for duplet in self.value_data:
# the duplet is label, item
item, label = duplet
combo.addItem(label)
combo.currentIndexChanged.connect(self.currentIndexChanged)
return combo
def setEditorData(self, editor, index):
editor.blockSignals(True)
editor.setCurrentIndex(index.row())
editor.blockSignals(False)
def setModelData(self, editor, model, index):
"This is the data stored into the field"
print("Current text: %s" % editor.currentText())
model.setData(index, self.item(editor.currentText()))
def currentIndexChanged(self):
self.commitData.emit(self.sender())