Important: Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

QPlainTextEdit : Make block readonly?



  • Hi,

    Is it possible to make only few text blocks readonly and not whole qplaintextedit?

    textblock is QTextCursor block.

    Thank you :)



  • Can u elaborate a bit more on the requirement ....this could help to design a custom widget where in u can have QTextCursorblock (s) or some modification like MyQPlainTextEdit has a MyQTextContent and both of this can have their own implementations.

    Need more details on requirement to put some concrete code fwd.



  • Ok

    Consider a case when you editing some text in a editor. Now you open this(block of text) in new editor (with some more options) now I want unless I close that second editor first editor should make that selected text as readonly (not in selection mode anymore) that means I can edit any other text apart from that block (piece of text) in first editor.

    Is it clear?



  • It is possible to do what you want. You should extend the QPlainTextEdit, and build in this sort of behavior. You can get the block(s) you are interested in and then customize how you want it to behave. These specific blocks can give you their bounds and then you can control events in these bounds. I think that should work. Not sure if there is an easier way.



  • yea looking for easy way because I feel short code always smart to use and write but difficult to think.

    Thanks you for your suggestion.



  • relooked at this... did u come up with any alternate approach? u have me curious now :)



  • You could connect to the QPlainTextEdit::cursorPositionChanged () signal on both editors and when the user changes the position of the second editor to be inside the block the first is editing you can move the cursor outside of that block quickly

    That might do the trick without inheriting.



  • @thomas, but that would show the cursor jump from the position set to outside of the block. might not be smooth, especially under load



  • @chetankjain the 'under load' problem should not exist as signals in Qt are executed immediately without delay. So the moment the user hits the key and its handled by Qt, the user code is executed.



  • @thomas there is a finite gap between the moment user hits the key and the execution of user code, but under heavy system load this gap could magnify



  • This may help QPlainTextEdit::cursorPositionChanged () but again watching this an overhead.

    I want only a specific block and whole editor. I agree with chetankjain about this overhead load.

    Thank you for suggesstions. :)



  • bq. Yes you can. E.g. for all non editable blocks use QTextBlock::setUserState() and give them 666. Then reimp keypress event or install an event filter and check if the cursor is in a block where the user value is 666. If so, don't propagate the event. That's all.

    I'm looking for something like this. Cheers :)

    "Original":http://www.qtcentre.org/threads/32609-a-Readonly-Highlighted-TextBlock-in-QTextEdit?p=151542#post151542


Log in to reply