Just starting with Red and am having a difficult time understanding how to evaluate blocks. The following gives me a *** Script Error: panel has no value error:
Red [
needs: 'view
]
my-panel: [
panel 300x300 [
text "World"
]
]
view [
title "Hello"
do my-panel
]
I can get it working if I inline the contents of the my-panel block, but can't find a way to split code up and then include it inside the view function's block. Could anyone give me a real quick pointer to what is wrong with the above code?
Red language contains several DSLs, the one you are using above after view call is VID. The do word has different meanings in different contexts. In Red regular language, it evaluates a block of Red Code, in VID, it's a keyword, that allows to embed Red code into VID. So far so good, but you are not passing a block of Red code to do, but a block of VID code.
I guess that you want to achieve is inserting the my-panel block dynamically. That can be achieved using different means, the easiest would be using compose function:
Red [
needs: 'view
]
my-panel: [
panel 300x300 [
text "World"
]
]
view compose [
title "Hello"
(my-panel)
]
We have several chat rooms on Gitter in case you need a more interactive help.
Cheers!