textbrower character limit

KOHAK

I want to limit the number of characters in the textbrower of pyqt.
If the number of characters is over, I want to make the old letters disappear.

jsulm

@KOHAK You could subclass QTextBrowser and overwrite https://doc.qt.io/qt-5/qtextbrowser.html#keyPressEvent There you can count the number of characters and remove old characters if needed.

JonB

@KOHAK
You could try to see whether a suitable QRegularExpressionValidator stops the user typing more characters than you want to allow.

Otherwise you must follow @jsulm's approach.

KOHAK

@jsulm Is it possible to limit the textbrower content even though it is not my input?

jsulm

@KOHAK Do you mean if the text is set via https://doc.qt.io/qt-5/qtextedit.html#setText for example? You can do this also if you subclass QTextBrowser and override setText() and the other set*() methods.

Alternative would be to connect a slot to https://doc.qt.io/qt-5/qtextedit.html#textChanged signal and handle your requirement there.

SimonSchroeder

From my experience, these kind of modifications are better done using QTextDocument. Every QTextEdit has an underlying QTextDocument. The document class has a lot more signals/slots you can connect to and control the overall behaviour of the content.

ollarch

Hi,

Could you try this?

myTextBrowser->document()->setMaximumBlockCount(iMaxValue);

You have to adapt it to Python as it is C++.