[REBOL] Re: colour text corruption
From: gjones05:mail:orion at: 14-May-2001 18:18
From: "Graham Chiu"
> I was playing around with the howto on panels, and put them
> into my vidwiki pages.
>
> However, a little oddity occurs with the page named
> "howto-subpanel-4"
>
> When you pass your mouse pointer over the text, it
> highlights as expected. But after you click on it, the text
> stays highlighted gold, and then after that black turns into
> gold - Midas effect! And it affects other pages as well :-(
>
> --
> Graham Chiu
Hi, Graham,
The Midas Touch -- I like the idea! So I tried hooking it up to my
Curriculum Vitae, but, alas, it didn't turn into gold! :-(
This struck me as a curious buglet, and out of curiosity, I tried to
track it
down. It took a long, long time to figure out where it was being
introduced.
The first thing that I discovered is that distributed applications
through the /View desktop can be extremely difficult to debug. After
much struggling, I finally convinced myself that it wasn't your code or
Jeff K.'s (scroll-face.r). The code looked so complicated that I just
assumed that the font color was getting corrupted somehow with all the
face manipulations. It was in the course of using selective probes that
I noticed what was going on. Then I was able to simplify the recreation
of the bug to its simplest form.
The problem can be recreated as follows:
REBOL []
view layout [
txt "Click Me" [
view/new l1: layout [
txt "Click to Close" [
unview l1
]
]
]
]
In the main window, the 'txt path font/colors contains the default color
(black 0.0.0) and the highlight color (255.180.55 if I recall correctly)
in a block. The text is clicked while the cursor is over the text,
which means that the font/color (notice that this is singular) changes
to the highlight color, as one would expect. But the font/colors
(plural) now changes to [255.180.55 255.180.55]. Thereafter, the
default color will remain corrupted. This change stays in effect until
that instance of REBOL/View is unloaded. I cannot find the code the is
doing the corrupting, but I suspect that it is a simple typo (a color is
poked into 'font/colors instead of 'font/color) somewhere in the view
vid code.
The work-around is as follows:
REBOL []
view layout [
txt "Click Me" [
view/new l1: layout [
txt "Click to Close" [
unview l1
]
face/font/colors/1: 0.0.0
]
]
]
This work-around explicitly pokes the black default color back into the
block.
I'll forward this to [feedback--rebol--com] as a possible bug.
Your REBOL Wiki is really taking shape. Keep up the good work.
--Scott Jones
