Re: [platform-text-dev] line wrapping

[Kai-Uwe Maetzel <kai-uwe_maetzel@xxxxxxxxxx>]

Yes, you could. This way you'd circumvent
any support available in the widget and avoid the problems I described.

When you want to have a solution that
does not just work for a particular kind of document but for any document
you would have to implement something like LineWrappingDocument (similar
to Document) that works with a line wrapping line tracker and a text store
forwarding all requests to a particular IDocument instance. The LineWrappingDocument
would serve as the visible document of a text viewer whereas the IDocument
instance would be the viewer's input document. This is also the scheme
along which we implemented folding and segmented mode. The downside of
this approach to line wrapping is that you'd duplicate code that is already
available in SWT land.

Kai

zohar.melamed@xxxxxxxxxxxxxxxxx
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10/01/2004 04:33 PM

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Subject	Re: [platform-text-dev] line wrapping

I have full control of the IDocument for which line wrapping is required.
Can I get this to work using a custom ILineTracker ?







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kai-uwe_maetzel@xxxxxxxxxx@eclipse.org - 01/10/2004 12:01


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Subject:    Re: [platform-text-dev] line wrapping


Zohar,

The StyledText widget supports line wrapping. Line wrapping is not
considered in any layer higher up.  Thus, text viewers and text editors
are not aware of line wrapping.  However, because of the existing
support
for folding and segmented views clients are supposed to never directly
map
between widget coordinates and viewer coordinates. (Viewer or model
coordinates are those that are expressed in terms of character offsets
of
the viewer's input document. In case of folding or segmented mode, the
visible document differs from the input document.) Clients should use the
ITextViewerExtension5 interface for conversion.  The text viewer itself
uses an IDocumentInformationMapping instance to implement the extension
interface. This all should make line wrapping work in most case already.
For displaying, problem areas are most likely to be found in the vertical
ruler columns such as the LineNumberRulerColumn and the
AnnotationRulerColumn and in the editor's status line item displaying the
caret coordinates. For interaction, problems will show up everywhere where
we expect a model line to match a displayed line. Among other these might
be: moving/copying lines, deleting/cutting lines, extending selection to
be a line selection, etc.

Kai

> I have been looking at adding a fixed column line wrapping to TextEditor
> but see no simple way of doing this.
>
> Any ideas ?
>
> Cheers
> Zohar

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Zohar,

The StyledText widget supports line
wrapping. Line wrapping is not considered in any layer higher up.  Thus,
text viewers and text editors are not aware of line wrapping.  However,
because of the existing support for folding and segmented views clients
are supposed to never directly map between widget coordinates and viewer
coordinates. (Viewer or model coordinates are those that are expressed
in terms of character offsets of the viewer's input document. In case of
folding or segmented mode, the visible document differs from the input
document.) Clients should use the ITextViewerExtension5 interface for conversion.
 The text viewer itself uses an IDocumentInformationMapping instance
to implement the extension interface. This all should make line wrapping
work in most case already. For displaying, problem areas are most likely
to be found in the vertical ruler columns such as the LineNumberRulerColumn
and the AnnotationRulerColumn and in the editor's status line item displaying
the caret coordinates. For interaction, problems will show up everywhere
where we expect a model line to match a displayed line. Among other these
might be: moving/copying lines, deleting/cutting lines, extending selection
to be a line selection, etc.

Kai

> I have been looking at adding a fixed column
line wrapping to TextEditor
> but see no simple way of doing this.
> 
> Any ideas ?
> 
> Cheers
> Zohar