class UI::State(T)

• UI::State(T)
• Reference
• Object

Overview

Type-safe reactive state container.

When the value changes, all registered listeners are notified with the old and new values. Listeners are NOT called when the same value is assigned (equality check via !=).

Example: counter = UI::State(Int32).new(0) counter.on_change { |old_val, new_val| puts "#{old_val} -> #{new_val}" } counter.value = 1 # prints "0 -> 1" counter.value = 1 # no output (same value)

Defined in:

ui/state.cr

Constructors

• .new(value : T)

Instance Method Summary

• #on_change(&block : T, T -> Nil) : Nil
• #remove_listeners : Nil
• #value : T
• #value=(new_value : T) : T

Constructor Detail

Instance Method Detail