Ok, great, thanks for the clarification.
I've decided to trust that QTextDocument is well optimised ;-) (And having done some rough test I can say it seems it indeed is) Best Regards, Vojtech Kral On 2013-09-11 19:20, Gopalakrishna Bhat wrote: > On Wed, Sep 11, 2013 at 9:43 PM, Vojtěch Král <vojt...@kral.hk> wrote: > >> Hi, >> I don't understand how to edit text blocks in QTextDocument using >> QTextCursor. >> So far I've been inserting text using QTextCursor::insertText() and it >> worked fine, >> however, I later noticed that each call to QTextCursor::insertText() >> creates a new QTextBlock within the document. >> >> Is it possible to somehow append text to an existing block instead of >> creating a new one? >> My concern is that this might incur a lot of overhead both in terms of >> cpu time and memory, especially once the document contains a lot of >> text. > > CPU and memory should not be a big issue. There are bigger applications out > there that opens complexly formatted documents MBs in size using QTextBlocks. > >> In this regard I'm also wondering what is the purpose of void >> QTextCursor::insertBlock(). >> I can't seem to find a way how this group of functions would ever be >> useful, but I assume there is a reason they are provided. > > QTextCursor::insertText inserts a new QTextBlock with the current character > format. > QTextCursor::insertBlock allows you to create a new text block set a format > to it and then insert > > Something on the lines of > > QTextBlockFormat blockFormat; > QTextCharFormat textCharFormat; textCharFormat.setFontPointSize(11); > textCharFormat.setFontWeight(QFont::Normal); > cursor.insertBlock(blockFormat, textCharFormat); > >> If it is of any relevance I'm using QTextDocument to display output of a >> console application, including support color of formatting/coloring >> escape sequences etc., which works fine, apart from the large block >> count problem. >> >> Thanks for any advice. >> VK >> >> _______________________________________________ >> Interest mailing list >> Interest@qt-project.org >> http://lists.qt-project.org/mailman/listinfo/interest [1] > > Regards, > Gopalakrishna > -- > My blog http://gkbhat.blogspot.com [2] Links: ------ [1] http://lists.qt-project.org/mailman/listinfo/interest [2] http://gkbhat.blogspot.com
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