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我正在使用 QComboBox 将来自数据库的一些 MAC 地址显示为整数。为了以更熟悉的“dotted octets”格式显示它们,我创建了以下QStyledItemDelegate

class MacAddressDelegate(QStyledItemDelegate):

    def __init__(self):
        super(MacAddressDelegate, self).__init__()

    def _intMacToString(self, intMac):
        hexmac = ('%x' % intMac).zfill(12)
        return ':'.join(s.encode('hex') for s in hexmac.decode('hex')).upper()

    def setModelData(self, editor, model, index):
        macstr = editor.text().__str__()
        intmac = int(macstr.replace(':',''), 16)
        model.setData(index, intmac, Qt.EditRole)

    def setEditorData(self, editor, index):
        intmac = index.model().data(index, Qt.EditRole)
        if intmac.isValid():
            editor.setText(self._intMacToString(intmac.toULongLong()[0]))

    def paint(self, painter, option, index):
        # let the base class initStyleOption fill option with the default values
        super(MacAddressDelegate, self).initStyleOption(option, index)

        if option.state & QStyle.State_Selected:
            painter.fillRect(option.rect, option.palette.highlight())
            painter.setPen(Qt.color0)
        else:
            painter.setPen(Qt.color1)

        intmac = index.model().data(index, Qt.DisplayRole)
        if intmac.isValid():
            text = self._intMacToString(intmac.toULongLong()[0])
            painter.drawText(option.rect, Qt.AlignVCenter, text)

但是当我从QSqlTableModelQComboBox委托设置模型时:

    # Setting model and delegate
    macRangesModel = QSqlQueryModel()
    macRangesModel.setQuery("select FIRST_MAC, ADDRESS_BLOCK_MASK from MacRanges")
    macRangesModel.select()
    self.initialMacComboBox.setModel(macRangesModel)
    self.initialMacComboBox.setItemDelegate(MacAddressDelegate())
    self.initialMacComboBox.setModelColumn(0)

它仅适用于下拉列表中的项目,但不适用于列表关闭时显示的默认项目(请注意,整数 346868604928 对应于 MAC 地址 00:50:C2:FA:E0:00):

在此处输入图像描述

为什么会这样?我知道模型是否可编辑,默认值应该显示在QLineEdit中,但事实并非如此,那么我们如何为关闭的QComboBox小部件设置QItemDelegate呢?

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