PyQt5:设置自定义ComboBox文本的字体颜色，这取决于与数据帧中的另一个元素相匹配的选定元素

from PyQt5.QtWidgets import QApplication, QMainWindow, QComboBox, QStyledItemDelegate, QStyleOptionViewItem
from PyQt5.QtGui import QColor, QPainter
from PyQt5.QtCore import Qt, QStandardItemModel

class CustomDelegate(QStyledItemDelegate):
    def paint(self, painter, option, index):
        # 根据匹配的选定元素设置字体颜色
        text = index.data(Qt.DisplayRole)
        match_text = "匹配的选定元素"

        if text == match_text:
            option.palette.setColor(QPalette.Text, QColor(Qt.red))
        else:
            option.palette.setColor(QPalette.Text, QColor(Qt.black))

        option.state &= ~QStyle.State_HasFocus
        super().paint(painter, option, index)

app = QApplication([])
window = QMainWindow()

combo_box = QComboBox(window)
combo_box.setGeometry(10, 10, 200, 30)

# 创建数据模型
model = QStandardItemModel()
combo_box.setModel(model)

# 添加选项
option1 = QStandardItem("选项1")
option2 = QStandardItem("选项2")
option3 = QStandardItem("匹配的选定元素")
model.appendRow(option1)
model.appendRow(option2)
model.appendRow(option3)

# 设置自定义委托
delegate = CustomDelegate(combo_box)
combo_box.setItemDelegate(delegate)

window.setCentralWidget(combo_box)
window.show()

app.exec_()