用不同的颜色填充QTreeView中的单元格，用不同的颜色填充QDiagCrossPattern

from PyQt5.QtCore import Qt
from PyQt5.QtGui import QPainter, QColor, QBrush
from PyQt5.QtWidgets import QStyledItemDelegate

class ColorDelegate(QStyledItemDelegate):
    def paint(self, painter, option, index):
        # 获取单元格的数据
        data = index.data(Qt.DisplayRole)
        
        # 设置不同的颜色填充
        if data == "QDiagCrossPattern":
            brush = QBrush(Qt.DiagCrossPattern)
            painter.setBrush(brush)
        else:
            brush = QBrush(Qt.SolidPattern)
            painter.setBrush(brush)
        
        # 绘制单元格
        painter.drawRect(option.rect)

from PyQt5.QtWidgets import QApplication, QMainWindow, QTreeView, QStandardItemModel

if __name__ == "__main__":
    app = QApplication([])
    window = QMainWindow()
    
    # 创建QTreeView和QStandardItemModel
    tree_view = QTreeView()
    model = QStandardItemModel()
    
    # 设置自定义代理类
    delegate = ColorDelegate()
    tree_view.setItemDelegate(delegate)
    
    # 添加数据到model
    item = QStandardItem("QDiagCrossPattern")
    model.appendRow(item)
    
    # 设置model给QTreeView
    tree_view.setModel(model)
    
    window.setCentralWidget(tree_view)
    window.show()
    
    app.exec_()