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Minimal editor based on bespoke IDocument [message #1732395]

Mon, 16 May 2016 15:40

Eclipse User

Hi

I have implemented a bespoke IDocument backed by a bespoke model. I extended org.eclipse.jface.text.Document and implemented get() and get(offset, length) of IDocument to return the model as text.

I create my bespoke IDocument within the getDocument(Object element) method of IDocumentProvider and then in TextEditor I use

setDocumentProvider(documentProvider)

When I run RCP, the text editor opens. Calls are made to get() and get(offset, length) of my IDocument, and debugging shows that the correct text is returned from the model.

But no content is shown in the TextEditor - just a blue background.

I suspect that I have missed a step but can't identify that at the moment.

Can anyone help with this?

Thanks

Robert

[Updated on: Mon, 16 May 2016 16:01] by Moderator

Re: Minimal editor based on bespoke IDocument [message #1732408 is a reply to message #1732395]

Mon, 16 May 2016 19:58

Eclipse User

The short answer is that you've missed a lot of steps. An IDocument is not just a wrapper object around a String. Methods that the editor relies on would all be returning the wrong results, compared to what should be returned for your string, because your string isn't actually being stored in the document.

Re: Minimal editor based on bespoke IDocument [message #1732566 is a reply to message #1732408]

Wed, 18 May 2016 05:34

Eclipse User

Thanks Nitin

It looks as though I should be implementing ITextStore over my model, rather than implementing IDocument.

So I implemented ITextStore for my model, and overrode Document.getTextStore() to return that implementation.

Still blank

Are there any docs which show how TextEditor calls out to IDocument, which shows what further helpers in Document I need to override?

Thanks

Robert

[Updated on: Wed, 18 May 2016 06:23] by Moderator

Re: Minimal editor based on bespoke IDocument [message #1732736 is a reply to message #1732566]

Thu, 19 May 2016 14:45

Eclipse User

Solved

Do not attempt to implement IDocumentProvider from scratch!

Solution was to extend AbstractDocumentProvider instead.

In AbstractDocumentProvider.createDocument(), I return a MyModelDocument which extends AbstractDocument

The constructor of MyModelDocument sets a ITextStore which is backed by my bespoke model. It also sets a ILineTracker which is backed by the bespoke model.

Finally I have set a IDocumentPartitioner in preparation for future work.

Thanks

Robert

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