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Custom annotation that treats the entire annotation as a single item

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RichTextBox
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Frank
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Frank asked on 11 Apr 2012, 08:10 PM
Hello,

I'm having trouble understanding the DeleteBehavior, BackspaceBehavior, and DeleteSelectedBehavior properties in annotations.  They do not seem to be working how I would expect them to.

I would like to have a custom annotation that works almost exactly like a read-only annotation range, but I would like to be able to select and delete the entire annotation range, including the text, from the UI.

I assumed that I would be able to customize this behavior by setting the DeleteBehavior, BackspaceBehavior, and DeleteSelectedBehavior, but it doesn't seem to work regardless of what settings I specify in those overridden properties.

Is it even possible to do what I am asking?

Thanks,

Frank

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Iva Toteva
Telerik team
answered on 12 Apr 2012, 12:13 PM
Hi Frank,

We are still polishing the way the different behaviors work for the various annotation ranges types.

In a nutshell, you can achieve the desired behavior by inheriting from FieldRangeStartBase and FieldRangeEndBase and setting the SkipPositionsRange property of the range start to true, i.e.:

public override bool SkipPositionsInRange
{
    get
    {
        return true;
    }
}

Please find attached a demo illustrating the implementation. If you need further assistance, do not hesitate to contact us again.

Kind regards,
Iva Toteva
the Telerik team

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Frank
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answered on 12 Apr 2012, 02:13 PM
Iva,

Your solution worked.  I was trying to do something similar on my own, but I think the key was in the way you instantiated the range markers.  I was just calling new SemanticRangeStart() and new SemanticRangeEnd(), but I believe creating them as a pair is what I needed to do and just did not realize.

Here is your code that I believe solved the problem:

SemanticRangeEnd rangeEnd = new SemanticRangeEnd();
SemanticRangeStart rangeStart = (SemanticRangeStart)rangeEnd.CreatePairedStart();

Thank you,

Frank
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Iva Toteva
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Frank
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