PyQt5中如何设置QTableWidget的每一项的选择颜色

How to set each item's selection color of QTableWidget in PyQt5

我希望在选择项目时有不同的选择颜色。但是 QTableWidget::item:selected{ background-color: } 仅在只有一个项目被选中时有效,否则所有被选中的项目将具有相同的选择颜色。那么有没有办法让每个项目都有单独的选择颜色?

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        self.MainWindow=MainWindow
        self.MainWindow.resize(300, 100)
        self.centralwidget = QtWidgets.QWidget(self.MainWindow)
        self.MainWindow.setCentralWidget(self.centralwidget)
        """table """
        self.tableWidget = QtWidgets.QTableWidget(self.centralwidget)
        self.tableWidget.insertRow(0)
        self.tableWidget.setColumnCount(2)
        
        self.tableWidget.setItem(0,0,QtWidgets.QTableWidgetItem("red"))
        self.tableWidget.setItem(0,1,QtWidgets.QTableWidgetItem("blue"))
        self.tableWidget.itemSelectionChanged.connect(self.ChangeSelectionColor)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)
    def ChangeSelectionColor(self):
        try:
            for item in self.tableWidget.selectedItems():
                col=item.column()
            self.tableWidget.setStyleSheet("QTableWidget::item:selected{ background-color: %s }"%color_list[col])
        except UnboundLocalError:
            pass
if __name__ == "__main__":
    import sys
    color_list=['red','blue']
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())

一个选择效果不错。

多选只是将颜色应用到所有选中的项目。我希望左边的选择后是红色的。

在这种情况下使用qss是不合适的,因为它们有很多限制,实现一个委托是合适的,在这种情况下是一个继承自QStyledItemDelegate的class。但在此之前我们必须通过QTableWidgetItem的setData方法保存颜色信息:

it = QTableWidgetItem("some_text")
it.setData(Qt.UserRole, some_color)

然后覆盖QStyledItemDelegate的paint方法,改变选择颜色:

class ColorDelegate(QStyledItemDelegate):
    def paint(self, painter, option, index):
        color = index.data(Qt.UserRole)
        option.palette.setColor(QPalette.Highlight, color)
        QStyledItemDelegate.paint(self, painter, option, index)

则委托成立:

your_qtablewidget.setItemDelegate(ColorDelegate())

我在下面展示了一个完整的例子:

from PyQt5.QtWidgets import QApplication, QStyledItemDelegate, QTableWidget, QTableWidgetItem, QStyle
from PyQt5.QtGui import QColor, QPalette
from PyQt5.QtCore import qrand, Qt

class ColorDelegate(QStyledItemDelegate):
    def paint(self, painter, option, index):
        color = index.data(Qt.UserRole)
        option.palette.setColor(QPalette.Highlight, color)
        QStyledItemDelegate.paint(self, painter, option, index)


def fun(n_rows, n_columns):
    return [[QColor(qrand() % 256, qrand() % 256, qrand() % 256) for i in range(n_rows)] for j in range(n_columns)]

if __name__ == '__main__':
    import sys

    app = QApplication(sys.argv)
    n_rows, n_columns = 10, 10
    colors = fun(n_rows, n_columns)
    w = QTableWidget()
    w.setColumnCount(n_columns)
    w.setRowCount(n_columns)
    for i in range(w.rowCount()):
        for j in range(w.columnCount()):
            it = QTableWidgetItem("{}-{}".format(i, j))
            it.setData(Qt.UserRole, colors[i][j])
            w.setItem(i, j, it)
    w.setItemDelegate(ColorDelegate())
    w.show()
    sys.exit(app.exec_())