[REBOL] Re: drawing images on text face after displayed = "highlighting text"
From: henrikmk:gmai:l at: 1-Oct-2008 14:26
On Wed, Oct 1, 2008 at 2:14 PM, Alan Macleod <fergus4-bellatlantic.net> wrote:
> Henrik,
>
> I was going to map the start and endpoints using caret_to_offset on find
> text and find/tail text. And knowing the text field width paint multiple
> boxes to fit the shape. Not pretty but I think good enough for what I want.
I use almost the same method.
> Or is the function that highlight_start and highlight-end uses available or
> is it hidden too deep (not mezzazine)
>
> Anton, or Henrik,
>
> Is it possible to use the draw dialect to "paint" these highlights? The way
> a simple paint program pains into an area?
You can probably do that with the SHAPE command in DRAW. To ensure
accurate painting, I would use SIZE-TEXT as it can accurately detemine
the width and height of the area you need to paint per row.
My implementation uses plain boxes and then SIZE-TEXT to calculate the
size of one highlight box. It works for all font sizes I've tested so
far. My only problem right now is detecting the start and end point of
multi-line text as I want a more accurate depiction of the selected
text.
To detect multiple line highlights: If the Y position of
caret-to-offset is not identical for start and end position, then you
are using multiple lines.
--
Regards,
Henrik Mikael Kristensen
