Qt-interest Archive, February 2008
How to modify a QTextDocument without affecting the undo/redo stacks?
Message 1 in thread
How to edit a QTextDocument without affecting the undo/redo stacks?
I wrote a syntax highlighter using QTextCursor into
QTextDocument::contentsChanged(). Setting colors using QTextCursor works
fine, but I experience a problematic side-effect of having the
colorization being written as separate edit commands into the undo/redo
stacks. This is Qt 4.3.3.
Any comments are welcome,
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Message 2 in thread
There're QSyntaxHighlighter class and corresponding example in
examples/richtext/syntaxhighlighter. I'd suggest using them.
If you still want to create your own highlighter, you may try this:
1) block signals from your editor (QObject::blockSignals(true));
2) apply colorization;
3) unblock signals (QObject::blockSignals(false)).
I haven't found better way to prevent undo/redo stack modifications
because QTextDocument::setUndoRedoEnabled(false) clears it and that's
definately not what you want.
On Wed, 06 Feb 2008 23:17:29 +0300, Frank Mertens <frank@xxxxxxxxxxx>
wrote:
> How to edit a QTextDocument without affecting the undo/redo stacks?
>
> I wrote a syntax highlighter using QTextCursor into
> QTextDocument::contentsChanged(). Setting colors using QTextCursor works
> fine, but I experience a problematic side-effect of having the
> colorization being written as separate edit commands into the undo/redo
> stacks. This is Qt 4.3.3.
>
> Any comments are welcome,
> --
> Frank.
>
> --
> To unsubscribe - send a mail to qt-interest-request@xxxxxxxxxxxxx with
> "unsubscribe" in the subject or the body.
> List archive and information: http://lists.trolltech.com/qt-interest/
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Message 3 in thread
Thx, for that hint, had no idea about QObject::blockSignals().
Tried it, but it wasn't working.)
Found a cleaner solution:
QTextDocument => QxCxxHighlight::contentsChanged(int,int,int):
textCursor_->joinsPreviousEditBlock();
... apply color information
textCursor_->endEditBlock();
Cheers,
Frank.
Constantin Makshin wrote:
> There're QSyntaxHighlighter class and corresponding example in
> examples/richtext/syntaxhighlighter. I'd suggest using them.
>
> If you still want to create your own highlighter, you may try this:
> 1) block signals from your editor (QObject::blockSignals(true));
> 2) apply colorization;
> 3) unblock signals (QObject::blockSignals(false)).
>
> I haven't found better way to prevent undo/redo stack modifications
> because QTextDocument::setUndoRedoEnabled(false) clears it and that's
> definately not what you want.
>
> On Wed, 06 Feb 2008 23:17:29 +0300, Frank Mertens <frank@xxxxxxxxxxx>
> wrote:
>> How to edit a QTextDocument without affecting the undo/redo stacks?
>>
>> I wrote a syntax highlighter using QTextCursor into
>> QTextDocument::contentsChanged(). Setting colors using QTextCursor
>> works fine, but I experience a problematic side-effect of having the
>> colorization being written as separate edit commands into the
>> undo/redo stacks. This is Qt 4.3.3.
>>
>> Any comments are welcome,
>> --
>> Frank.
>>
>> --
>> To unsubscribe - send a mail to qt-interest-request@xxxxxxxxxxxxx
>> with "unsubscribe" in the subject or the body.
>> List archive and information: http://lists.trolltech.com/qt-interest/
>
> --Constantin "Dinosaur" Makshin
>
> --
> To unsubscribe - send a mail to qt-interest-request@xxxxxxxxxxxxx with
> "unsubscribe" in the subject or the body.
> List archive and information: http://lists.trolltech.com/qt-interest/
>
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