c++ - Use QTextEdit or QTextBrowser readonly but keep MarkDown Checkboxes clickable - Stack Overflow

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I want to display MarkDown in a QTextEdit or a QTextBrowser as read-only. However, I want to be able to toggle MarkDown checkboxes. But if I set setReadOnly(true); the checkboxes are not clickable.

I tried various combinations of setTextInteractionFlags(Qt::LinksAccessibleByMouse); etc. but either the whole text is editable or the checkboxes are not clickable.

Is there a way to achieve this?

I want to display MarkDown in a QTextEdit or a QTextBrowser as read-only. However, I want to be able to toggle MarkDown checkboxes. But if I set setReadOnly(true); the checkboxes are not clickable.

I tried various combinations of setTextInteractionFlags(Qt::LinksAccessibleByMouse); etc. but either the whole text is editable or the checkboxes are not clickable.

Is there a way to achieve this?

• c++
• qt
• qtextedit
• qtextbrowser

Share Improve this question Follow edited Mar 25 at 2:26 musicamante 48.7k88 gold badges4141 silver badges7474 bronze badges asked Mar 24 at 13:10 CryptkeeperCryptkeeper 16311 silver badge99 bronze badges 1

• 1 Setting the readOnly property is fundamentally the same as calling setTextInteractionFlags() with related options, and toggling a checkbox actually changes the contents of the document, therefore you cannot make the document read only and still keep checkboxes interactive. The only way to achieve this is by overriding mouse handlers (press, move and release), get the document's documentLayout() and call blockWithMarkerAt(), then eventually work with it based on the mouse event, if the block is valid. – musicamante Commented Mar 24 at 20:55

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1 Answer 1

Sorted by: Reset to default 1

I found a more or less "hacky" workaround by overriding mouse handlers but without the need to handle the document manipulation itself, by enabling write "just in time":

void ReadOnlyTextEdit::mouseReleaseEvent(QMouseEvent *event)
{
    setReadOnly(false);
    QTextEdit::mouseReleaseEvent(event);
    setReadOnly(true);
}

void ReadOnlyTextEdit::mouseMoveEvent(QMouseEvent *event)
{
    setReadOnly(false);
    QTextEdit::mouseMoveEvent(event);
    setReadOnly(true);
}

So far it seems to work and I have not found any drawbacks yet.

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