UI.Collapsing
| Name | Mandatory | Description | Default | Type | 
| ⬅️ Input |  | The value that will be passed to the Contents shards of the collapsing header. |  | Any | 
| Output ➡️ |  | The output of this shard will be its input. |  | Any | 
| Heading | No | The heading text or widgets for this collapsing header. | none | StringVar(String)Shard[Shard]None | 
| Contents | No | The UI contents. | none | NoneShard[Shard] | 
| DefaultOpen | No | Whether the collapsing header is opened by default. | false | BoolVar(Bool) | 
 
A header which can be collapsed/expanded, revealing a contained UI region.
Examples
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18 | @wire(ui-wire {
  UI.Window(
    Position: @f2(0 0)
    Anchor: Anchor::Center
    Width: 200
    Height: 200
    Flags: [WindowFlags::NoResize]
    Contents: {
      UI.Collapsing(
        Heading: UI.Button("Heading" Msg("Clicked"))
        DefaultOpen: true
        Contents: {"Content" | UI.Label}
      )
    }
  )
} Looped: true)
{ui-behavior: ui-wire}
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20 | @wire(ui-wire {
  UI.Window(
    Position: @f2(0 0)
    Anchor: Anchor::Center
    Width: 200
    Height: 200
    Flags: [WindowFlags::NoResize]
    Contents: {
      UI.Collapsing(
        Heading: "Heading"
        DefaultOpen: true
        Contents: {
          "Content" | UI.Label
        }
      )
    }
  )
} Looped: true)
{ui-behavior: ui-wire}
 |