如何使用QItemDelegate更改QTableView文本颜色？

Question

我已经创建了子类化的QItemDelegate并重定义了paint方法。我试过了

painter.setPen(QtGui.QColor('#FFFFFF'))

这不管用。如何更改文本颜色？

顺便说一句，我试图通过调用painter.setBackground( color )来给背景上色，这也不起作用。这些方法打算如何使用？

class ItemDelegate(QtWidgets.QItemDelegate):
    def __init__(self, parent):
        QtWidgets.QItemDelegate.__init__(self, parent)
        self.parent = parent


    def paint(self, painter, option, index):
        item = index.data(QtCore.Qt.DisplayRole)
        #print(item)
        print(dir(painter))
        if index.column() == 1:
            color = QtGui.QColor('#34ebc6')
        elif index.column() == 2:
            color = QtGui.QColor('#FFFFFF')
        elif index.column() == 3:
            color = QtGui.QColor('#9546c7')
        else:
            color = QtGui.QColor('#FFFFFF')
        painter.fillRect(option.rect, color)
        super(ItemDelegate, self).paint(painter, option, index)

Answer 1

您必须覆盖drawDisplay方法，其中您必须更改组件面板的QPalette::Text和QPalette::HighlightedText角色的值：

class ItemDelegate(QtWidgets.QItemDelegate):
    def paint(self, painter, option, index):
        color = QtGui.QColor("#FFFFFF")
        if index.column() == 1:
            color = QtGui.QColor("#34ebc6")
        elif index.column() == 2:
            color = QtGui.QColor("#FFFFFF")
        elif index.column() == 3:
            color = QtGui.QColor("#9546c7")
        painter._color = color

        super(ItemDelegate, self).paint(painter, option, index)

    def drawDisplay(self, painter, option, rect, text):
        color = painter._color
        opt = QtWidgets.QStyleOptionViewItem(option)
        cg = (
            QtGui.QPalette.Normal
            if opt.state & QtWidgets.QStyle.State_Enabled
            else QtGui.QPalette.Disabled
        )
        if opt.state & QtWidgets.QStyle.State_Selected:
            opt.palette.setColor(cg, QtGui.QPalette.HighlightedText, color)
        opt.palette.setColor(cg, QtGui.QPalette.Text, color)
        super(ItemDelegate, self).drawDisplay(painter, opt, rect, text)

使用QStyledItemDelegate会更容易，因为您只需要覆盖initStyleOption方法：

class ItemDelegate(QtWidgets.QStyledItemDelegate):
    def initStyleOption(self, option, index):
        super(ItemDelegate, self).initStyleOption(option, index)

        color = QtGui.QColor("#FFFFFF")

        if index.column() == 1:
            color = QtGui.QColor("#34ebc6")
        elif index.column() == 2:
            color = QtGui.QColor("#FFFFFF")
        elif index.column() == 3:
            color = QtGui.QColor("#9546c7")

        cg = (
            QtGui.QPalette.Normal
            if option.state & QtWidgets.QStyle.State_Enabled
            else QtGui.QPalette.Disabled
        )
        if option.state & QtWidgets.QStyle.State_Selected:
            option.palette.setColor(cg, QtGui.QPalette.HighlightedText, color)

        option.palette.setBrush(QtGui.QPalette.Text, color)