class TUI::Scroller

• TUI::Scroller
• Reference
• Object

Defined in:

tui/widget/scroller.cr

Constant Summary

WHEEL_STEP = 3

Rows moved per mouse wheel tick — one shared default so widgets don't each redeclare an identical constant.

Constructors

• .new(offset : Int32 = 0)

Instance Method Summary

• #clamp(total : Int32, visible : Int32) : Nil

  Recompute a valid offset against current content/viewport sizes.

• #down(by : Int32 = 1, total : Int32 = Int32::MAX, visible : Int32 = 0) : Nil
• #fraction(total : Int32, visible : Int32) : Float64 | Nil

  0.0..1.0 position of the viewport within the content, or nil if the content fits entirely (no scrollbar needed).

• #offset : Int32

  First visible content row, 0-based.

• #reset : Nil
• #reveal(index : Int32, visible : Int32) : Nil

  Ensure index is within the visible window — scrolls minimally.

• #up(by : Int32 = 1) : Nil
• #wheel_down(by : Int32 = WHEEL_STEP, total : Int32 = Int32::MAX, visible : Int32 = 0) : Nil
• #wheel_up(by : Int32 = WHEEL_STEP) : Nil

  Wheel-tick convenience over #up/#down — same semantics, just names the common case and supplies the shared step default.

Constructor Detail

Instance Method Detail