---
author: ''
category: ''
date: 2010/02/15 18:47
description: ''
link: ''
priority: ''
slug: BB870
tags: programming, pyqt, python, qt
title: How to implement "replace all" in a QPlainTextEdit
type: text
updated: 2010/02/15 18:47
url_type: ''
---
This is not interesting for almost noone, but since my google-fu didn't let me find it and it was a bit of a pain to do:

This is how you implement 'replace all' in a QPlainTextEdit (or a QTextEdit, for that matter) using PyQt (similar for C++ of course).

.. code-block:: python

    def doReplaceAll(self):
        # Replace all occurences without interaction

        # Here I am just getting the replacement data
        # from my UI so it will be different for you        
        old=self.searchReplaceWidget.ui.text.text()
        new=self.searchReplaceWidget.ui.replaceWith.text()

        # Beginning of undo block
        cursor=self.editor.textCursor()
        cursor.beginEditBlock()
        
        # Use flags for case match
        flags=QtGui.QTextDocument.FindFlags()
        if self.searchReplaceWidget.ui.matchCase.isChecked():
            flags=flags|QtGui.QTextDocument.FindCaseSensitively
            
        # Replace all we can
        while True:
            # self.editor is the QPlainTextEdit
            r=self.editor.find(old,flags)
            if r:
                qc=self.editor.textCursor()
                if qc.hasSelection():
                    qc.insertText(new)
            else:
                break
                
        # Mark end of undo block
        cursor.endEditBlock()

There are other, easier ways to do it, but this one makes it all appear as a single operation in the undo stack and all that.