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Linking elements so they can't be split by a page break

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RichTextBox
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ric
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ric asked on 05 Nov 2013, 12:15 PM
Is this possible or supported? Are there any workarounds?

Essentially we might, for example, have a heading followed by an image. But occasionally the auto-page wrapping can split them up, so that the heading and images essentially have a page break in between. It'd be nice to be able to link them somehow to prevent this happening

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Petya
Telerik team
answered on 08 Nov 2013, 12:01 PM
Hello,

You can try inserting a non-breaking space between the elements, for example with the Alt+0+1+6+0 shortcut. However, please note that at this point non-breaking spaces are not fully supported and they will not be preserved on export/import roundtrips to DOCX. You can track the availability of the feature here.

I hope this helps!

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Petya
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ric
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answered on 08 Nov 2013, 05:14 PM
I've tried that and don't think it's what we need, while it does prevent items that are inline from being separated by a page break it won't help us force two items that are NOT inline (e.g. text, line break, then image) to always appear on the same page

EDIT: appears that MS-Word supports paragraphs (AKA block items) to have "keep with next" set, do you support something similar? http://support.microsoft.com/kb/233493
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ric
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answered on 11 Nov 2013, 02:55 PM
I've been working on a workaround. But am having trouble with document positions. Specifically I want to remember the caret position then refer to it later  (to see if I'm still on the same page) but if I do

dim startPosition as New DocumentPosition(editor.Document.CaretPosition) 

and then move the Caret the above variable changes! I want a snapshot so I can put the caret back when I've finished. How do I do that?

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Petya
Telerik team
answered on 11 Nov 2013, 04:28 PM
Hi,

Keep with next functionality is not currently available in RadRichTextBox. The feature is in our to-do list, but it is not scheduled, so I cannot tell when it might be implemented.

As for your other questions, the method you are using to copy the caret position might indeed cause the observed problem. I suggest you create the copy as follows instead:
Dim startPosition As New DocumentPosition(editor.Document)
startPosition.MoveToPosition(editor.Document.CaretPosition)

Let us know if you have other questions.

Regards,
Petya
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ric
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answered on 11 Nov 2013, 04:31 PM
Thanks, yes, that did the trick. I'm putting start and end marker strings in the document, using textsearch to find them then if both positions are on different pages inserting a page break. 
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Petya
Telerik team
answered on 12 Nov 2013, 09:38 AM
Hello,

I'm glad to hear my answer was helpful!

I just wanted to follow-up on this and mention that RadRichTextBox's document model allows inserting elements which are not visually represented and can be used for semantic purposes - annotations. Moreover, you can easily create a custom annotation and will not have to insert marker strings in the document. For more information you can check this help article.

I hope this helps!

Regards,
Petya
Telerik
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ric
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answered on 12 Nov 2013, 10:27 AM
Thanks, that looks interesting, though I can't find a way of getting a DocumentPosition from a RangeStart instance?
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Petya
Telerik team
answered on 12 Nov 2013, 03:07 PM
Hi,

Annotation markers are Inline document elements, so you can simply use the MoveToInline() method of DocumentPosition:
DocumentPosition pos = new DocumentPosition(this.radRichTextBox.Document);
pos.MoveToInline(annotationStart);

Do not hesitate to get back to us if you have other questions.

Regards,
Petya
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