When is the time we should use has vbox and vbox?

[tofuuu]

Firstly first, what is the difference between hasvbox and vbox? And when we should use it? Thank you!

[Remix]

From my experience, mostly when you either do not need non default style or when you have them defined as a _v/hbox sub style of the parent...

Code: Select all

frame:
    style_prefix "my_frame"
    has vbox # uses my_frame_vbox styles (I think)

    # items

frame:
    vbox:
        spacing 17 # inline styling (easiest way to start, before moving styles away)

        # items

frame:
    has vbox # uses some default styles that might not fit
    
    # items
    
# to end the vbox, we have to un-indent past the frame

Personally I mostly prefer using vbox: so the block/items are indented and easier to see.

Also note: has vbox does not use a block so there is no easy way to "end" the content (for example if you wanted 2 vbox inside a hbox you would need to use blocks or contain each vbox in a fixed/frame or somesuch and un-indent past that container)

[xavimat]

I don't know the use with styles.
has vbox or has hbox are used inside other containers (mostly frame). When you need only one box on that container (you can add more boxes and other children _inside_ that box, but nothing more outside the box (in that container).
Is useful to avoid one level of indentation, specially in complex screens.
Is used a lot to give a background to a box. Boxes have no background property, so putting has vbox inside a frame produces a simple way to have a background without more indentation.

[trooper6]

According to the documentation, you use has with elements that take only one child, like frame.

[xavimat]

According to the documentation, you use has with elements that take only one child, like frame.

That can be confusing. You can add many children to a frame. They will be internally wrapped inside a "fixed" so, technically that frame will have only one child (the fixed that contains the children). But, looking at the code you won't _see_ the fixed. So it _seems_ that the frame itself has more than one children. Using "has" you cannot add more children outside the "has".