如何从搜索列表中突出显示 QTableWidget 中的单词

Question

我想通过单词列表搜索 QTableWidget-Table，如果找到它们，我希望它们被突出显示。

我试图从here 修改代码，因此该表正在按单词列表进行搜索，而不仅仅是一个单词。不幸的是，我的结果不断被覆盖。我总是只得到列表中最后一个单词的结果。

有谁知道如何修改代码以显示整个单词列表的结果？

代码如下：

from PyQt5 import QtCore, QtGui, QtWidgets
import random
import html

words_1 = ["Hello dseerfd", "world sdfsdf sdfgsdf sdfsdf", "Stack dasdf", "Overflow", "Hello world", """<font color="red">Hello world</font>"""]

class HTMLDelegate(QtWidgets.QStyledItemDelegate):
    def __init__(self, parent=None):
        super(HTMLDelegate, self).__init__(parent)
        self.doc = QtGui.QTextDocument(self)

    def paint(self, painter, option, index):
        substring = index.data(QtCore.Qt.UserRole)
        painter.save()
        options = QtWidgets.QStyleOptionViewItem(option)
        self.initStyleOption(options, index)
        res = ""
        color = QtGui.QColor("red")
        if substring:
            substrings = options.text.split(substring)
            res = """<font color="{}">{}</font>""".format(color.name(QtGui.QColor.HexRgb), substring).join(list(map(html.escape, substrings)))
        else:
            res = html.escape(options.text)
        self.doc.setHtml(res)

        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()


class Widget(QtWidgets.QWidget):
    def __init__(self, parent=None):
        super(Widget, self).__init__(parent)
        hlay = QtWidgets.QHBoxLayout()
        lay = QtWidgets.QVBoxLayout(self)
        self.table = QtWidgets.QTableWidget(5, 5)
        lay.addLayout(hlay)
        lay.addWidget(self.table)



        self.table.setItemDelegate(HTMLDelegate(self.table))

        for i in range(self.table.rowCount()):
            for j in range(self.table.columnCount()):
                it = QtWidgets.QTableWidgetItem(random.choice(words_1))
                self.table.setItem(i, j, it)


        text_list = ['ello', 'ack']
        # clear
        allitems = self.table.findItems("", QtCore.Qt.MatchContains)

        selected_items =[]
        for words in text_list:
            for item in allitems:
                selected_items = self.table.findItems(words, QtCore.Qt.MatchContains)
                selected_items.append(self.table.findItems(words, QtCore.Qt.MatchContains)) ## i tried to make a list which is beeing appened but using this list it returns only the same as the input

                item.setData(QtCore.Qt.UserRole, words if item in selected_items else None)




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

Answer 1

在前一种情况下，我想过滤这些情况，以免不必要地进行绘制，但在这种情况下，因为它更复杂，我决定使用 QTextCharFormat 而不是 HTML 来实现高亮逻辑，如下所示：

from PyQt5 import QtCore, QtGui, QtWidgets
import random

words = ["Hello dseerfd", "world sdfsdf sdfgsdf sdfsdf", "Stack dasdf", "Overflow", "Hello world", """<font color="red">Hello world</font>"""]

class HighlightDelegate(QtWidgets.QStyledItemDelegate):
    def __init__(self, parent=None):
        super(HighlightDelegate, self).__init__(parent)
        self.doc = QtGui.QTextDocument(self)
        self._filters = []

    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()
        fmt = QtGui.QTextCharFormat()
        fmt.setForeground(QtCore.Qt.red)
        for f in self.filters():
            highlightCursor = QtGui.QTextCursor(self.doc)
            while not highlightCursor.isNull() and not highlightCursor.atEnd():
                highlightCursor = self.doc.find(f, highlightCursor)
                if not highlightCursor.isNull():
                    highlightCursor.mergeCharFormat(fmt)
        cursor.endEditBlock()

    @QtCore.pyqtSlot(list)
    def setFilters(self, filters):
        if self._filters == filters: return
        self._filters = filters

    def filters(self):
        return self._filters

class Widget(QtWidgets.QWidget):
    def __init__(self, parent=None):
        super(Widget, self).__init__(parent)

        self.table = QtWidgets.QTableWidget(30, 6)
        self._delegate = HighlightDelegate(self.table)
        self.table.setItemDelegate(self._delegate)
        for i in range(self.table.rowCount()):
            for j in range(self.table.columnCount()):
                it = QtWidgets.QTableWidgetItem(random.choice(words))
                self.table.setItem(i, j, it)
        self.table.horizontalHeader().setSectionResizeMode(QtWidgets.QHeaderView.ResizeToContents)

        le = QtWidgets.QLineEdit()
        le.textChanged.connect(self.on_textChanged)
        lay = QtWidgets.QVBoxLayout(self)
        lay.addWidget(le)
        lay.addWidget(self.table)

        le.setText("ello ack")

    @QtCore.pyqtSlot(str)
    def on_textChanged(self, text):
        self._delegate.setFilters(list(set(text.split())))
        self.table.viewport().update()

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