使用 PySide2 在 QTableView 中设置文本样式

Question

我有一个填充了适当模型的 QTableView。 我想根据上下文更改文本的样式：

文本，如果括号之间有什么东西，只是这部分文本应该变成绿色-包括括号-（和粗体，只要不是更难）。

如果你能提供一个sn-p或超级简单的例子，我很感激。

Answer 1

你必须使用一个使用QTextDocument的委托：

import random
from PySide2 import QtCore, QtGui, QtWidgets

words = '''Lorem ipsum dolor sit amet, consectetur adipiscing elit. 
Mauris euismod cursus mi sit amet pellentesque. 
Proin sed lectus sed augue scelerisque congue eget quis leo. 
Curabitur ultrices nisi nisi, placerat gravida urna sagittis et. 
Nullam vitae urna tortor. Curabitur a lobortis metus, et laoreet arcu. 
Quisque a mi in purus molestie porta non sit amet purus. 
Sed porta non purus et suscipit.'''.split()

class HighlightDelegate(QtWidgets.QStyledItemDelegate):
    def __init__(self, parent=None):
        super(HighlightDelegate, self).__init__(parent)
        self.doc = QtGui.QTextDocument(self)
        self._regex = QtCore.QRegularExpression()
        self._highlight_format = QtGui.QTextCharFormat()

    def paint(self, painter, option, index):
        painter.save()
        options = QtWidgets.QStyleOptionViewItem(option)
        self.initStyleOption(options, index)
        self.doc.setPlainText(options.text)
        self.apply_highlight()
        options.text = ""
        style = QtWidgets.QApplication.style() if options.widget is None \
            else options.widget.style()
        style.drawControl(QtWidgets.QStyle.CE_ItemViewItem, options, painter)

        ctx = QtGui.QAbstractTextDocumentLayout.PaintContext()
        if option.state & QtWidgets.QStyle.State_Selected:
            ctx.palette.setColor(QtGui.QPalette.Text, option.palette.color(
                QtGui.QPalette.Active, QtGui.QPalette.HighlightedText))
        else:
            ctx.palette.setColor(QtGui.QPalette.Text, option.palette.color(
                QtGui.QPalette.Active, QtGui.QPalette.Text))

        textRect = style.subElementRect(
            QtWidgets.QStyle.SE_ItemViewItemText, options)

        if index.column() != 0:
            textRect.adjust(5, 0, 0, 0)

        the_constant = 4
        margin = (option.rect.height() - options.fontMetrics.height()) // 2
        margin = margin - the_constant
        textRect.setTop(textRect.top() + margin)

        painter.translate(textRect.topLeft())
        painter.setClipRect(textRect.translated(-textRect.topLeft()))
        self.doc.documentLayout().draw(painter, ctx)

        painter.restore()

    def apply_highlight(self):
        cursor = QtGui.QTextCursor(self.doc)
        cursor.beginEditBlock()
        highlightCursor = QtGui.QTextCursor(self.doc)
        while not highlightCursor.isNull() and not highlightCursor.atEnd():
            highlightCursor = self.doc.find(self.regex, highlightCursor)
            if not highlightCursor.isNull():
                highlightCursor.mergeCharFormat(self.highlightFormat)
        cursor.endEditBlock()

    @property
    def regex(self):
        return self._regex

    @regex.setter
    def regex(self, regex):
        if self._regex == regex: return
        self._regex = regex

    @property
    def highlightFormat(self):
        return self._highlight_format

    @highlightFormat.setter
    def highlightFormat(self, fmt):
        self._highlight_format = fmt

class MainWindow(QtWidgets.QMainWindow):
    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent)

        self.table = QtWidgets.QTableView()

        self._delegate = HighlightDelegate(self.table)
        self._delegate.regex = QtCore.QRegularExpression(r"\(.*?\)")
        fmt = QtGui.QTextCharFormat()
        fmt.setForeground(QtCore.Qt.green)
        fmt.setFontWeight(QtGui.QFont.Bold)
        self._delegate.highlightFormat = fmt
        self.table.setItemDelegate(self._delegate)

        model = QtGui.QStandardItemModel(10, 4)
        for i in range(model.rowCount()):
            for j in range(model.columnCount()):
                item = QtGui.QStandardItem("{}({}){}".format(*random.sample(words,3)))
                model.setItem(i, j, item)
        self.table.setModel(model)
        self.setCentralWidget(self.table)

if __name__ == '__main__':
    import sys
    app = QtWidgets.QApplication(sys.argv)
    w = MainWindow()
    w.show()
    sys.exit(app.exec_())