World: r3wp

Here's a quick link to what you're looking for : http://www.hmkdesign.dk/rebol/list-view/docs/list-view.html#section-3

Btw, here's another useful link about VID styles : http://www.codeconscious.com/rebol/vid-notes.html

thanks for the links.  I do have that list-view, I was trying to 
find a smaller way out.  It was missing one or two features I was 
wanting last I checked, and didn't feel like pouring over the source 
code.  about 100 pages.  My brain would take quite a few months to 
understand it.   Excellent software though.  I'll give it some more 
thought, and thanks again for the vid-notes link.  It looks very 
clean.

Digging out the old but still very good for quick VID learning vid-usage.r 
script: http://www.rebol.org/view-script.r?script=vid-usage.r

If you want a small solution, you can use the LIST style, but it's 
a bit more complex to work with. You can find some examples in the 
vid-usage.r script (look of some examples is horrible, but it will 
show you how to build custom multi-column lists).

well.... looking back through my coded examples... I actually have 
a good working list-box with over l000 rows with the columns correctly 
spaced.  However, its missing some necessary features, one of which 
is how do i attach the vertical scrollbar to the list box.   I tried 
the vid-usage.r script but perhaps I must have missed some key elements. 
 I'll try looking at that again.

I wrote a quick example to show you how to achieve that : ]

data: make block! 16

loop 16 [repend/only data [random "012345789" random "abcdefghij"]]

visible: 5					; number of visible lines
window: (length? data) - visible	; sliding window size
cursor: 0

view layout [
	across
	space 0x0
	
	grid: list 200x100 [
		across
		txt 100
		txt 100
	] supply [	
		if row: pick data count + cursor [face/text: pick row index]
	]
	sc: scroller 16x100 [
		cursor: sc/data * window
		show grid
	]
	do [
		sc/step: 1 / window		; initializing scroller steps granularity
	]
]

Forgot to set the scroller bar size, the 'do init code should be 
:

	do [
		sc/step: 1 / window		; initializing scroller steps granularity
		sc/redrag 5 / length? data	; initializing scroller bar size
	]

or even better : sc/redrag visible / length? data

That is an excellent example.  Answered many questions I had (and 
raised a few more).  Thank you for taking the time to show me this 
Dockimbel.

I'm glad it helped you. It was a good opportunity for me to refresh 
my memory about the (powerful but under-documented) LIST style.

In case you're wondering about the block after SUPPLY, it's used 
internally by the LIST style to build an iterating function defining 
a local context where COUNT refers to the current row and INDEX to 
the current column. Each horizontally positionned face (purpose of 
the ACROSS keyword) defined in the LIST layout block, is counted 
as a column, so: txt 100 txt 100 => 2 columns.

I'm need to get the name I assigned a face when I alt-click on it. 
I can get its style, offset, size etc but I do not see a way to get 
the face's name. More specificly I have multiple scroll-panels and 
I need to know the one I'm clicking in...

What name?

a: scroll-panel [blah blah blah
b: scroll-panel [blah blah blah

I want to know if I clciked in scroll-panel a or b

if event/type = 'alt-down [face/style]

...gives me 'scroll-panel'

how do i get 'a' or 'b'

Sorry for the possible confusion but its one of anton's styles but 
did not think it would make a diff.

face = a ??

face/var

yeah?

it works...

of course it does :-)

I thought about var but I thhought that would be too simple to work...
Thanks alot Henrik!

Is that because its Anton's style or is that a rebol thing for all 
faces?

no problem

face/var is set during layout for all faces that have a set-word! 
attached.

great! Thanks!

you can also set it yourself like this:

scroll-panel [with: 'a]

oops

scroll-panel with [var: 'a]

but when you do that, there is no global word set. it can still be 
useful however, if you desire to recognize a face using different 
means, like traversing a pane for a specific face.

good to know

Must be a VID thing.  Rebgui doesn''t do this AFAIK

this is done in the LAYOUT function. good one to study:

source layout

face/var !!! OMG never knew this.... hehe

amacleod,    there's always stones unturned in REBOL even for us 
advanced users ;-)

I reckon you did know this,. Maxim, but you just forgot about because 
it's not needed so much.

What I do, which is more simple and direct, is just compare face 
with the word I previously set it to, eg:

	my-scroll-panel: scroll-panel

and later in the event handler just

	if face = my-scroll-panel [...]


This is just comparing two object references for equality, which 
is more fundamental and doesn't need any facility of VID.

Thanks, I'll try that too Anton.


I was not able to gfet Henricks suggestion to work when placing the 
event handler in the main program...it only worked when placed in 
the seperate scroll-panel.r file.

I always setup stuff in the object directly using the with block. 
I was just amazed that after so long, such a feature is still unknown 
to me.  :-)

Eh? You really ought not to have to modify the scroll-panel.r file. 
That's just going to cause problems for you down the line, because 
you are forking. You should be able to override the default scroll-panel 
feel in your user code. Just let me know what you're trying to do 
with that and I'll show how.

Anton, I had the same worry about forking....

this addition/change to scroll-panel.r works: 

detect: func [face event][
	if event/type = 'alt-down [	
		if face/var = 'my-scroll-panel [ print "hello"]
	]
	event
]

But this addition to global handler does not: 

alt-detect: func [face event][
	if event/type = 'alt-down [	
		if face/var = 'my-scroll-panel [ print "hello"]
	]
	event
]
insert-event-func :alt-detect

get error on face/var

Yes, probably because not all faces in the system are VID faces. 
A VID face is an extension of system/standard/face with several facets 
added, including VAR.

If the event handler came across a non-VID face, then face/var is 
an invalid path.

So you see, this is an example of why using this method to identify 
a face is more brittle.
You should better use:

	face = my-scroll-panel

to determine identity of a face.

Anton, Your method is not working for me:

alt-event: func [face event] [
	if event/type = 'alt-down [ print "alt-click"
		if face = my-scroll-panel [print "face name = my-scroll-panel"]
		]
	event
]
insert-event-func :alt-event


I get "alt-click" but I do not get true for 'if face = my-scroll-panel'


I tried 'my-scroll-panel (word) and "my-scroll-panel" (quotes") also....

Aha, I know what's probably happening. The scroll-panel contains 
a number of subfaces in a face hierarchy. You are probably not clicking 
on the scroll-panel face, but on one of its subfaces (which are laid 
on top of it, event-wise). If you look at scroll-panel.r, near the 
bottom of the rebol header, you will see the face hierarchy, with 
the two scrollers, the CROP-BOX and the SUBFACE inside the crop-box. 
The SUBFACE covers most of the area of the scroll-panel, and the 
two scrollers take some from the sides.

You can test this idea by giving the scroll-panel an edge, then alt-clicking 
on the edge. You should get a positive identification then. But of 
course, this is probably not very useful to you. What (I assume) 
you will need to do is, given a face, find out if it is inside a 
scroll-panel (or inside a particular scroll-panel of yours). This 
is a little bit complicated, but I have done most of that coding 
already for  mouse roll-wheel scrolling. (See scroll-wheel-handler.r, 
and demo-scroll-wheel-handler.r for how to use it.)

Basically, you will want to make your own "right-click-handler.r", 
just copying scroll-wheel-handler.r's code and modifying the event 
type that is checked for to 'alt-down. Scroll-wheel-handler checks 
for an Anton-extended VID flag, SCROLL-WHEEL, to determine which 
face should handle the event. So I might also advise you define your 
own VID flag to indicate that a face handles alt-click, maybe call 
it simply ALT-DOWN like the event that triggers it, or CONTEXT-MENU-ACTIVE, 
or whatever you're doing. Then make sure that the faces you want 
to respond to your "right-click-handler.r" are flagged with this 
new flag.
That's all, simple!

I think I see what you are saying, but...
Sounds like more than I want to tackle right now...

I think I'm going to stick with hacking up scroll-panel.r (since 
it seems to work)...the whole app feels like a hacked mess anyway 
so when R3 is ready I'll rewrite it for R3...Where I hope alot of 
these problems will not exist..

Thank you for the help

why not just follow the face up to its parent until you hit the scroll 
panel and then compare then?

not sure how to go about that..

doesn't each face have a value for parent-face ?

That's exactly what I'm doing in scroll-wheel-handler.

Starting with the face clicked on, I climb up to the parent-face 
iteratively until I find an ancestor of the face which is a scroll-panel.