本文通过Python3+PyQt5实现《python Qt Gui 快速编程》这本书13章程序Rich文本的行编辑，可以通过鼠标右键选择对文本进行加粗，斜体，下划线，删除线，上标，下标等编辑。

#!/usr/bin/env python3import platformimport sysimport htmlfrom PyQt5.QtCore import QSize, Qt,pyqtSignalfrom PyQt5.QtGui import QColor, QFont,QFontMetrics, QIcon, QKeySequence, QPixmap,QTextCharFormatfrom PyQt5.QtWidgets import QAction,QApplication,QMenu,QTextEditclass RichTextLineEdit(QTextEdit): returnPressed=pyqtSignal() (Bold, Italic, Underline, StrikeOut, Monospaced, Sans, Serif, NoSuperOrSubscript, Subscript, Superscript) = range(10) def __init__(self, parent=None): super(RichTextLineEdit, self).__init__(parent) self.monofamily = "courier" self.sansfamily = "helvetica" self.seriffamily = "times" self.setLineWrapMode(QTextEdit.NoWrap) self.setTabChangesFocus(True) self.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOff) self.setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOff) fm = QFontMetrics(self.font()) h = int(fm.height() * (1.4 if platform.system() == "Windows" else 1.2)) self.setMinimumHeight(h) self.setMaximumHeight(int(h * 1.2)) self.setToolTip("Press <b>Ctrl+M</b> for the text effects " "menu and <b>Ctrl+K</b> for the color menu") def toggleItalic(self): self.setFontItalic(not self.fontItalic()) def toggleUnderline(self): self.setFontUnderline(not self.fontUnderline()) def toggleBold(self): self.setFontWeight(QFont.Normal if self.fontWeight() > QFont.Normal else QFont.Bold) def sizeHint(self): return QSize(self.document().idealWidth() + 5, self.maximumHeight()) def minimumSizeHint(self): fm = QFontMetrics(self.font()) return QSize(fm.width("WWWW"), self.minimumHeight()) def contextMenuEvent(self, event): self.textEffectMenu() def keyPressEvent(self, event): if event.modifiers() & Qt.ControlModifier: handled = False if event.key() == Qt.Key_B: self.toggleBold() handled = True elif event.key() == Qt.Key_I: self.toggleItalic() handled = True elif event.key() == Qt.Key_K: self.colorMenu() handled = True elif event.key() == Qt.Key_M: self.textEffectMenu() handled = True elif event.key() == Qt.Key_U: self.toggleUnderline() handled = True if handled: event.accept() return if event.key() in (Qt.Key_Enter, Qt.Key_Return): self.returnPressed.emit() event.accept() else: QTextEdit.keyPressEvent(self, event) def colorMenu(self): pixmap = QPixmap(22, 22) menu = QMenu("Colour") for text, color in ( ("&Black", Qt.black), ("B&lue", Qt.blue), ("Dark Bl&ue", Qt.darkBlue), ("&Cyan", Qt.cyan), ("Dar&k Cyan", Qt.darkCyan), ("&Green", Qt.green), ("Dark Gr&een", Qt.darkGreen), ("M&agenta", Qt.magenta), ("Dark Mage&nta", Qt.darkMagenta), ("&Red", Qt.red), ("&Dark Red", Qt.darkRed)): color = QColor(color) pixmap.fill(color) action = menu.addAction(QIcon(pixmap), text, self.setColor) action.setData(color) self.ensureCursorVisible() menu.exec_(self.viewport().mapToGlobal( self.cursorRect().center())) def setColor(self): action = self.sender() if action is not None and isinstance(action, QAction): color = QColor(action.data()) if color.isValid(): self.setTextColor(color) def textEffectMenu(self): format = self.currentCharFormat() menu = QMenu("Text Effect") for text, shortcut, data, checked in ( ("&Bold", "Ctrl+B", RichTextLineEdit.Bold, self.fontWeight() > QFont.Normal), ("&Italic", "Ctrl+I", RichTextLineEdit.Italic, self.fontItalic()), ("Strike &out", None, RichTextLineEdit.StrikeOut, format.fontStrikeOut()), ("&Underline", "Ctrl+U", RichTextLineEdit.Underline, self.fontUnderline()), ("&Monospaced", None, RichTextLineEdit.Monospaced, format.fontFamily() == self.monofamily), ("&Serifed", None, RichTextLineEdit.Serif, format.fontFamily() == self.seriffamily), ("S&ans Serif", None, RichTextLineEdit.Sans, format.fontFamily() == self.sansfamily), ("&No super or subscript", None, RichTextLineEdit.NoSuperOrSubscript, format.verticalAlignment() == QTextCharFormat.AlignNormal), ("Su&perscript", None, RichTextLineEdit.Superscript, format.verticalAlignment() == QTextCharFormat.AlignSuperScript), ("Subs&cript", None, RichTextLineEdit.Subscript, format.verticalAlignment() == QTextCharFormat.AlignSubScript)): action = menu.addAction(text, self.setTextEffect) if shortcut is not None: action.setShortcut(QKeySequence(shortcut)) action.setData(data) action.setCheckable(True) action.setChecked(checked) self.ensureCursorVisible() menu.exec_(self.viewport().mapToGlobal( self.cursorRect().center())) def setTextEffect(self): action = self.sender() if action is not None and isinstance(action, QAction): what = action.data() if what == RichTextLineEdit.Bold: self.toggleBold() return if what == RichTextLineEdit.Italic: self.toggleItalic() return if what == RichTextLineEdit.Underline: self.toggleUnderline() return format = self.currentCharFormat() if what == RichTextLineEdit.Monospaced: format.setFontFamily(self.monofamily) elif what == RichTextLineEdit.Serif: format.setFontFamily(self.seriffamily) elif what == RichTextLineEdit.Sans: format.setFontFamily(self.sansfamily) if what == RichTextLineEdit.StrikeOut: format.setFontStrikeOut(not format.fontStrikeOut()) if what == RichTextLineEdit.NoSuperOrSubscript: format.setVerticalAlignment( QTextCharFormat.AlignNormal) elif what == RichTextLineEdit.Superscript: format.setVerticalAlignment( QTextCharFormat.AlignSuperScript) elif what == RichTextLineEdit.Subscript: format.setVerticalAlignment( QTextCharFormat.AlignSubScript) self.mergeCurrentCharFormat(format) def toSimpleHtml(self): htmltext = "" black = QColor(Qt.black) block = self.document().begin() while block.isValid(): iterator = block.begin() while iterator != block.end(): fragment = iterator.fragment() if fragment.isValid(): format = fragment.charFormat() family = format.fontFamily() color = format.foreground().color() text=html.escape(fragment.text()) if (format.verticalAlignment() == QTextCharFormat.AlignSubScript): text = "_{0}".format(text) elif (format.verticalAlignment() == QTextCharFormat.AlignSuperScript): text = "^{0}".format(text) if format.fontUnderline(): text = "<u>{0}</u>".format(text) if format.fontItalic(): text = "<i>{0}</i>".format(text) if format.fontWeight() > QFont.Normal: text = "<b>{0}</b>".format(text) if format.fontStrikeOut(): text = "<s>{0}</s>".format(text) if color != black or family: attribs = "" if color != black: attribs += ' color="{0}"'.format(color.name()) if family: attribs += ' face="{0}"'.format(family) text = "<font{0}>{1}</font>".format(attribs,text) htmltext += text iterator += 1 block = block.next() return htmltextif __name__ == "__main__": def printout(lineedit): print(str(lineedit.toHtml())) print(str(lineedit.toPlainText())) print(str(lineedit.toSimpleHtml())) app = QApplication(sys.argv) lineedit = RichTextLineEdit() lineedit.returnPressed.connect(lambda:printout(lineedit)) lineedit.show() lineedit.setWindowTitle("RichTextEdit") app.exec_()

以上这篇python3+PyQt5 实现Rich文本的行编辑方法就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持。