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python3+PyQt5 实现Rich文本的行编辑方法

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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.

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#!/usr/bin/env python3
 
import platform
import sys
import html
from pyqt5.qtcore import qsize, qt,pyqtsignal
from pyqt5.qtgui import qcolor, qfont,qfontmetrics, qicon, qkeysequence, qpixmap,qtextcharformat
from pyqt5.qtwidgets import qaction,qapplication,qmenu,qtextedit
 
 
 
class 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 = "<sub>{0}</sub>" . format (text)
           elif ( format .verticalalignment() = =
              qtextcharformat.alignsuperscript):
             text = "<sup>{0}</sup>" . 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 htmltext
 
if __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我.

原文链接：https://blog.csdn.net/xiaoyangyang20/article/details/68924261 。

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