How to make a card layout collapsable?

Question

Mike Schmitt · Accepted Answer

If you build this functionality manually, as I'd suggest if you *absolutely* need a Card Layout instead of a Box Layout, then you can hide or show whatever you want inside your card when collapsed. As I said, you'd just need to do any hiding manually. 
 Edit: here's a portable example of such a thing: 
 a!localVariables(
 local!collapsed: false(),
 a!cardLayout(
 contents: {
 a!richTextDisplayField(
 labelPosition: "COLLAPSED",
 align: "RIGHT",
 value: {
 a!richTextIcon(
 icon: "angle-down-bold",
 showWhen: not(local!collapsed),
 size: "MEDIUM",
 linkStyle: "STANDALONE",
 link: a!dynamicLink(
 saveInto: a!save(local!collapsed, true())
 )
 ),
 a!richTextIcon(
 icon: "angle-right-bold",
 showWhen: local!collapsed,
 size: "MEDIUM",
 linkStyle: "STANDALONE",
 link: a!dynamicLink(
 saveInto: a!save(local!collapsed, false())
 )
 )
 }
 ),
 a!sectionLayout(
 label: "Card Contents",
 showWhen: not(local!collapsed),
 contents: {
 a!paragraphField(
 value: "paragraph" & char(10) & "text" & char(10) & "goes" & char(10) & "here",
 readOnly: true()
 )
 }
 )
 }
 )
)

Mike Schmitt · Answer

That's not a feature of a!cardLayout(). You could potentially accomplish a similar effect with a!boxLayout(), though. 
 Also note: there's nothing keeping you from implementing something like this in a!cardLayout() - manually, for yourself. You could have a Rich Text Icon in your card somewhere which, when clicked, hides all contents of the card (other than a "reopen" icon). That wouldn't be very difficult to do, wouldn't require any unusual workarounds, but isn't a built-in feature.