python - Pyqt QTablewidget 自动换行

Question

如何设置 QTableWidgetcolumn 的宽度，并使每个单元格中的文本在其宽度大于设置宽度的情况下从新行开始(有点像 Excel 中允许文本自动换行) )。现在，每个单元格的孔文本都写在很长的一行中，但我希望在 destop 应用程序中查看/可读是很好的。因此，我希望将文本保留在一个单元格中，但有一个自动换行/使文本中有新行。

这是我的代码，其中包含 self.table.setWordWrap(True) 命令，该命令不会执行任何操作。请注意，整个 qtablewidget 已被覆盖以对文本进行着色(我认为这可能是自动换行可能不起作用的问题):

from PyQt5.QtWidgets import *
from PyQt5 import QtCore, QtGui, QtWidgets, QtPrintSupport
import sys

found_words_num =int ('100')
data_single = {'Position':['hallo i like to do this and it would be nice if there was a new line. othere lines and so one.','b'], 'LV-Text': ['c','d'], 'Fundwörter': ['e','f'], 'Hersteller': ['g','h']}
words_in_columns = ['a','b']

textMargins = 12
borderMargins = 10


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

        self.setGeometry(50, 50, 1100, 850)  # Fenstergröße festlegen

        self.table = QTableWidget(self)
        self.table.setGeometry(QtCore.QRect(10, 10, 900, 600))
        self.table.setRowCount(found_words_num)
        self.table.setColumnCount(6)
        self.table.setSortingEnabled(True)
        self.table.setWordWrap(True)

        self._delegate = HighlightDelegate(self.table)  ##Klasse aufrufen
        self.table.setItemDelegate(self._delegate)
        le = QtWidgets.QLineEdit()
        le.textChanged.connect(self.on_textChanged)

        search_list = [word for column in words_in_columns for word in column]
        list_c_str = ' '.join(search_list)
        le.setText(list_c_str)

        horHeaders = []
        for col, key in enumerate(sorted(data_single.keys())):
            horHeaders.append(key)
            for row, item in enumerate(data_single[key]):
                newitem = QTableWidgetItem(item)
                newitem.setTextAlignment(QtCore.Qt.AlignCenter)
                self.table.setItem(row, col, newitem)

        self.table.setHorizontalHeaderLabels(['A', 'B','C', 'D' , 'E', 'F'])

        self.table.resizeRowsToContents()
        self.table.resizeColumnsToContents()

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


def main():
    app = QApplication(sys.argv)
    ex = main_result_pos()
    ex.show()
    sys.exit(app.exec_())


if __name__ == '__main__':
    main()

Answer 1

除了将垂直标题的sectionResizeMode设置为QHeaderView::ResizeToContents之外，还必须在QTextDocument中启用自动换行:

import sys
from PyQt5 import QtCore, QtGui, QtWidgets

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

    def paint(self, painter, option, index):
        painter.save()
        options = QtWidgets.QStyleOptionViewItem(option)
        self.initStyleOption(options, index)
        self.doc.setPlainText(options.text)
        self.apply_highlight()

        if self._wordwrap:
            self.doc.setTextWidth(options.rect.width())
        options.text = ""

        style = QApplication.style() if options.widget is None else options.widget.style()
        style.drawControl(QtWidgets.QStyle.CE_ItemViewItem, options, painter)

        if self._wordwrap:
            painter.translate(options.rect.left(), options.rect.top())
            clip = QtCore.QRectF(QtCore.QPointF(), QtCore.QSizeF(options.rect.size()))
            self.doc.drawContents(painter, clip)
        else:
            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, None)
            if index.column() != 0:
                textRect.adjust(5, 0, 0, 0)
            constant = 4
            margin = (option.rect.height() - options.fontMetrics.height()) // 2
            margin = margin - constant
            textRect.setTop(textRect.top() + margin)
            painter.translate(textRect.topLeft())
            painter.setClipRect(textRect.translated(-textRect.topLeft()))
            self.doc.documentLayout().draw(painter, ctx)

        painter.restore()
        s = QtCore.QSize(self.doc.idealWidth(), self.doc.size().height())
        index.model().setData(index, s, QtCore.Qt.SizeHintRole)

    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
        self.parent().viewport().update()

    def filters(self):
        return self._filters

    def setWordWrap(self, on):
        self._wordwrap = on
        mode = QtGui.QTextOption.WordWrap if on else QtGui.QTextOption.WrapAtWordBoundaryOrAnywhere

        textOption = QtGui.QTextOption(self.doc.defaultTextOption())
        textOption.setWrapMode(mode)
        self.doc.setDefaultTextOption(textOption)
        self.parent().viewport().update()

data_single = {'Position':['hallo i like to do this and it would be nice if there was a new line. othere lines and so one.','b'], 'LV-Text': ['c','d'], 'Fundwörter': ['e','f'], 'Hersteller': ['g','h']}
words_in_columns = ['a','b']

class main_result_pos(QtWidgets.QWidget):
    def __init__(self, parent=None):
        super(main_result_pos, self).__init__(parent)
        self.table = QtWidgets.QTableWidget(100, 6)
        self.table.verticalHeader().setSectionResizeMode(QtWidgets.QHeaderView.ResizeToContents)
        self.table.setSortingEnabled(True)

        self._delegate = HighlightDelegate(self.table)
        self.table.setItemDelegate(self._delegate)
        le = QtWidgets.QLineEdit(textChanged=self.on_textChanged)

        search_list = [word for column in words_in_columns for word in column]
        list_c_str = ' '.join(search_list)
        le.setText(list_c_str)

        horHeaders = []
        for col, key in enumerate(sorted(data_single.keys())):
            horHeaders.append(key)
            for row, item in enumerate(data_single[key]):
                newitem = QtWidgets.QTableWidgetItem(item)
                self.table.setItem(row, col, newitem)
        self.table.setHorizontalHeaderLabels(horHeaders)

        self._delegate.setWordWrap(True)
        self.resize(640, 480)

        lay = QtWidgets.QVBoxLayout(self)
        lay.addWidget(le)
        lay.addWidget(self.table)

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

def main():
    app = QtWidgets.QApplication(sys.argv)
    ex = main_result_pos()
    ex.show()
    sys.exit(app.exec_())

if __name__ == '__main__':
    main()