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Scroll bars in text-lists not working in Rebol 2

Hello!
    
I am using Rebol-view 278-3-1 on a Windows 10
    
I am trying to write a program that includes 3 text-lists. The second is populated depending on a selection made with the first text-list. The third one is populated by a selection made in the second.
    
What I see is that when the GUI is first drawn, if the contents of a text-list don’t fit (given the dimensions of the text-list) then the scroll bars in the text-list work, giving me access to the extra elements on the list.
    
As the second text-list is empty (when the GUI is first drawn) all “contents fit”, but if I select an option that populates more items that what the second text-list can show, the scroll bars don't work, and I can’t access the rest of the elements.
    
This happens whether I ask to “show” the particular text-list or the entire GUI.
    
Does anyone know a workaround?
    
Thanks in advance!

posted by:   brother Damian     18-Jan-2022/15:20:54-8:00



To illustrate the problem. Say:
    
info: [“item1” “item2” “item3” “item4” “item5” “item6” “item7” “item8” “item9” “item10” “item11” “item12” “item13” “item14” “item15”]
    
view layout [title “Scroll bars test” l1: text list data info]
    
We should see the text-list with a default size showing some of the elements in the info series AND scroll bars that give us access to the rest.
    
If instead we go
    
view layout [title “Scroll bars test” l1: text-list]
    
At this moment we should see a text-list with no info and therefore scroll bars that are not enabled. The problem happens now, if we load the text-list with data that goes beyond the viewable area, the scroll bars will not help us access it.
    
view layout [title “Scroll bars test” l1: text-list btn “Load Info” [l1/data: info show l1] ]
    
So, to reiterate, how can I have the scroll bars activate when the new data set is loaded?
    
Thanks in advance!

posted by:   Brother Damian     19-Jan-2022/14:24:24-8:00



hi!
I'm not sure I understood the problem correctly, but try refinement /update. For example, a small file viewer - select a file in the first list, the content is updated in the second:
>> view layout[text-list data read %. [b/data: read value b/update show b] b: text-list]
    
to see all possible options try:
>> ? b
B is an object of value:
     type            word!     face
     offset         pair!     20x228
     size            pair!     200x200
     span            none!     none
     pane            object! [type offset size span pane text color image effec...
     text            string! ""
     color         tuple!    240.240.240
     image         none!     none
     effect         none!     none
     data            block!    length: 0
     ...
     text-pane     function! [face id]
     update         function! [/local item value]
     resize         function! [new /x /y /local tmp]
    
to see source object "b":
>> source b
... many text...

posted by:   Sergey_Vl     20-Jan-2022/5:02:45-8:00



hi!
I'm not sure I understood the problem correctly, but try refinement /update. For example, a small file viewer - select a file in the first list, the content is updated in the second:
>> view layout[text-list data read %. [b/data: read value b/update show b] b: text-list]
    
to see all possible options try:
>> ? b
B is an object of value:
     type            word!     face
     offset         pair!     20x228
     size            pair!     200x200
     span            none!     none
     pane            object! [type offset size span pane text color image effec...
     text            string! ""
     color         tuple!    240.240.240
     image         none!     none
     effect         none!     none
     data            block!    length: 0
     ...
     text-pane     function! [face id]
     update         function! [/local item value]
     resize         function! [new /x /y /local tmp]
    
to see source object "b":
>> source b
... many text...

posted by:   Sergey_Vl     20-Jan-2022/5:02:48-8:00



Thank you Sergey_VI, that indeed solves the problem. After the update, the scroll bars become active as needed.
    
Following my example and your recommendation, the code needs to be amended as so:
    
view layout [title “Scroll bars test” l1: text-list btn “Load Info” [l1/data: info l1/update show l1] ]

posted by:   Brother Damian     21-Jan-2022/3:04:52-8:00



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