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How do you replace text using python qscintilla editor widget?

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  • E Offline
    E Offline
    enjoysmath
    wrote on 9 May 2021, 07:04 last edited by
    #1

    Here is a broken MWE. It replaces \nat with NN when it starts up, but when you type text it starts entering the text backwards.

    Was wondering if there was a recipe for replacing text that replaces only the substring and not the whole document.

    import sys
    from PyQt5.QtWidgets import *
    from PyQt5.QtCore import *
    from PyQt5.QtGui import *
    from PyQt5.Qsci import *
    import re
    
    NAT = re.compile(r"\\nat")
    
    class MyLexer(QsciLexerCustom):
       def __init__(self, parent):
          super(MyLexer, self).__init__(parent)
    
       def language(self):
          return "SimpleLanguage"
    
       def description(self, style):
          return ""
    
       def styleText(self, start, end):
          self.startStyling(start)
          editor = self.parent()
          text = editor.text()[start:end]
          text = NAT.sub('NN', text)
          
          editor.SendScintilla(editor.SCI_SETTEXT, text.encode('utf-8'))
             
    myCodeSample = r"""
    \nat
    """.replace("\n","\r\n")
    
    class CustomMainWindow(QMainWindow):
       def __init__(self):
          super(CustomMainWindow, self).__init__()
    
          self.setGeometry(300, 300, 800, 400)
          self.setWindowTitle("QScintilla Test")
          self.__frm = QFrame(self)
          self.__frm.setStyleSheet("QWidget { background-color: #ffeaeaea }")
          self.__lyt = QVBoxLayout()
          self.__frm.setLayout(self.__lyt)
          self.setCentralWidget(self.__frm)
          self.__editor = QsciScintilla()
          self.__editor.setText(myCodeSample)     # 'myCodeSample' is a string containing some C-code
          self.__editor.setLexer(None)            # We install lexer later
          self.__editor.setUtf8(True)             # Set encoding to UTF-8
          self.__lexer = MyLexer(self.__editor)
          self.__editor.setLexer(self.__lexer)
          self.__lyt.addWidget(self.__editor)
          self.show()
       def __btn_action(self):
          print("Hello World!")
    
    if __name__ == '__main__':
       app = QApplication(sys.argv)
       QApplication.setStyle(QStyleFactory.create('Fusion'))
       myGUI = CustomMainWindow()
       sys.exit(app.exec_())
    

    Have you solved this problem before? If so, please let me have the recipe :)

    https://github.com/enjoysmath
    https://math.stackexchange.com/users/26327/exercisingmathematician

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    • E Offline
      E Offline
      enjoysmath
      wrote on 9 May 2021, 07:33 last edited by
      #2
      def styleText(self, start, end):
         self.startStyling(start)
         editor = self.parent()
         #text = editor.text()[start:end]
         editor.findFirst(NAT.pattern, True, False, False, True)
         editor.replace('NN')
      

      I figured it out by RTFM here: https://www.riverbankcomputing.com/static/Docs/QScintilla/classQsciScintilla.html

      It does search the whole document, but I don't care since it's written in C++.

      https://github.com/enjoysmath
      https://math.stackexchange.com/users/26327/exercisingmathematician

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      9 May 2021, 07:04

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