<![CDATA[Designate QTextBlock as "Heading 1"]]>I build a QTextDocument by code using QTextCursor, and then export it to file in open document format. So far, so good, I can see my text and formats (font size, etc.).

However, I'd like to designate a text block as "Heading 1", "Heading 2", etc., so that the user can later on easily create a table of contents from my exported document, in the word processing program of their choice.

Is that possible, and if so, how?

]]>https://forum.qt.io/topic/82433/designate-qtextblock-as-heading-1RSS for NodeSun, 19 Apr 2026 12:58:39 GMTWed, 16 Aug 2017 10:01:49 GMT60<![CDATA[Reply to Designate QTextBlock as "Heading 1" on Wed, 16 Aug 2017 15:03:07 GMT]]>@Asperamanca
QTextBlock derives QTextFormat. QTextFormat can store user properties (see QTextFormat::setProperty())
You just need to define an enum with your custom property ids for example:

enum PropertyId {
     Heading1PropertyId = QTextFormat::UserProperty+1000
};
...
textBlock.setProperty(Heading1PropertyId, QVariant::fromValue<bool>(true));
textBlock.boolProperty(Heading1PropertyId); // convenience getter
]]>https://forum.qt.io/post/410728https://forum.qt.io/post/410728Wed, 16 Aug 2017 15:03:07 GMT<![CDATA[Reply to Designate QTextBlock as "Heading 1" on Wed, 16 Aug 2017 10:25:35 GMT]]>@Asperamanca It is just zero-based index count of all the blocks in the QTextDocument.

]]>https://forum.qt.io/post/410664https://forum.qt.io/post/410664Wed, 16 Aug 2017 10:25:35 GMT<![CDATA[Reply to Designate QTextBlock as "Heading 1" on Wed, 16 Aug 2017 10:19:00 GMT]]>@artwaw
Docs on blockNumber: "Note that this function only makes sense in documents without complex objects such as tables or frames."
Also, it doesn't seem to have a set method, so I guess the number is automatically determined in some way.

]]>https://forum.qt.io/post/410662https://forum.qt.io/post/410662Wed, 16 Aug 2017 10:19:00 GMT<![CDATA[Reply to Designate QTextBlock as "Heading 1" on Wed, 16 Aug 2017 10:15:14 GMT]]>Hi,
as far as I know QTextBlock has its own int number so it would be possible to add a string of your own and then QTextBlock::blockNumber().
However there is no QString identifier in the QTextBlock itself that I know of.

]]>https://forum.qt.io/post/410660https://forum.qt.io/post/410660Wed, 16 Aug 2017 10:15:14 GMT