QSortFilterProxyModel headerData

Question

我有 2 个 QTableView 连接到 2 个 QSortFilterProxyModel，它们仅连接到 1 个源模型 (QSqlRelationalTableModel)。

在对任何代理模型进行排序或过滤时，它会反映在各自的 table 视图中。但当我修改其中一个代理模型的 header 数据（装饰角色）时，它出现在两个 table 视图中。

我的问题是，header 数据是直接应用于源模型还是仅应用于代理？

我用它创建了一个 sqlite 示例数据库：

conn = sqlite3.connect('customers.db')
c = conn.cursor()
c.execute("PRAGMA foreign_keys=on;")

c.execute("""CREATE TABLE IF NOT EXISTS provinces (
        ProvinceId TEXT PRIMARY KEY, 
        Name TEXT NOT NULL
        )""")

c.execute("""CREATE TABLE IF NOT EXISTS customers (
        CustomerId TEXT PRIMARY KEY, 
        Name TEXT NOT NULL,
        ProvinceId TEXT,
        FOREIGN KEY (ProvinceId) REFERENCES provinces (ProvinceId) 
                ON UPDATE CASCADE
                ON DELETE RESTRICT
        )""")

c.execute("INSERT INTO provinces VALUES ('N', 'Northern')")
c.execute("INSERT INTO provinces VALUES ('E', 'Eastern')")
c.execute("INSERT INTO provinces VALUES ('W', 'Western')")
c.execute("INSERT INTO provinces VALUES ('S', 'Southern')")
c.execute("INSERT INTO provinces VALUES ('C', 'Central')")

c.execute("INSERT INTO customers VALUES ('1', 'customer1', 'N')")
c.execute("INSERT INTO customers VALUES ('2', 'customer2', 'E')")
c.execute("INSERT INTO customers VALUES ('3', 'customer3', 'W')")
c.execute("INSERT INTO customers VALUES ('4', 'customer4', 'S')")
c.execute("INSERT INTO customers VALUES ('5', 'customer5', 'C')")

conn.commit()
conn.close()

这是 window 显示我在为代理模型应用装饰时遇到的问题：

class Window(QWidget):
    def __init__(self):
        super().__init__()
        self.db = QSqlDatabase.addDatabase("QSQLITE")
        self.db.setDatabaseName("customers.db")
        self.db.open()

        self.model = QSqlRelationalTableModel(self, self.db)
        self.model.setTable("customers")
        self.model.select()

        self.proxy1 = QSortFilterProxyModel()
        self.proxy1.setSourceModel(self.model)

        self.proxy2 = QSortFilterProxyModel()
        self.proxy2.setSourceModel(self.model)

        hBox = QHBoxLayout()

        self.tblView1 = QTableView()
        self.tblView1.setModel(self.proxy1)

        self.tblView2 = QTableView()
        self.tblView2.setModel(self.proxy2)

        hBox.addWidget(self.tblView1)
        hBox.addWidget(self.tblView2)

        icon = QIcon(QPixmap("Resources/icon.png"))

        self.proxy1.setHeaderData(
            1, Qt.Orientation.Horizontal, icon, Qt.ItemDataRole.DecorationRole)

        widget = QWidget()
        widget.setLayout(hBox)
        self.setLayout(hBox)
        self.show()


def main():
    App = QApplication(sys.argv)
    window = Window()
    sys.exit(App.exec_())


if __name__ == '__main__':
    main()

Answer 1

这个问题是因为proxymodel的setHeaderData方法调用了sourcemodel的setHeaderData，也就是相当于调用了sourceModel的方法导致它也传播到其他proxymodels。一种可能的解决方案是覆盖代理模型的 headerData 方法，以便它 returns 仅在该代理模型中获得所需的值。

import sys

from PyQt5.QtCore import QSortFilterProxyModel, Qt
from PyQt5.QtGui import QIcon, QPixmap
from PyQt5.QtWidgets import QWidget, QHBoxLayout, QTableView, QApplication
from PyQt5.QtSql import QSqlDatabase, QSqlRelationalTableModel


class SortFilterProxyModel(QSortFilterProxyModel):
    def headerData(self, section, orientation, role=Qt.DisplayRole):
        if (
            section == 1
            and orientation == Qt.Horizontal
            and role == Qt.ItemDataRole.DecorationRole
        ):
            return QIcon(QPixmap("Resources/icon.png"))
        return super().headerData(section, orientation, role)


class Window(QWidget):
    def __init__(self):
        super().__init__()
        self.db = QSqlDatabase.addDatabase("QSQLITE")
        self.db.setDatabaseName("customers.db")
        self.db.open()

        self.model = QSqlRelationalTableModel(self, self.db)
        self.model.setTable("customers")
        self.model.select()

        self.proxy1 = SortFilterProxyModel()
        self.proxy1.setSourceModel(self.model)

        self.proxy2 = QSortFilterProxyModel()
        self.proxy2.setSourceModel(self.model)

        hBox = QHBoxLayout(self)

        self.tblView1 = QTableView()
        self.tblView1.setModel(self.proxy1)

        self.tblView2 = QTableView()
        self.tblView2.setModel(self.proxy2)

        hBox.addWidget(self.tblView1)
        hBox.addWidget(self.tblView2)


def main():
    App = QApplication(sys.argv)
    window = Window()
    window.show()
    sys.exit(App.exec_())


if __name__ == "__main__":
    main()

QSortFilterProxyModel headerData

QSortFilterProxyModel headerData

python

pyqt

qtableview

qsortfilterproxymodel

qsqlrelationaltablemodel