delegate set operate, run specify action

README.md

Usage

var drawGravity: Int by InvalidateDelegate(Gravity.LEFT)

private inner class InvalidateDelegate<T>(t: T) : SetActionDelegate<T>(t, {
    invalidate()
})

SetActionDelegate.kt

open class SetActionDelegate<T>(
    var t: T,
    inline val action: () -> Unit
) {
    operator fun getValue(any: Any, property: KProperty<*>): T = t

    operator fun setValue(any: Any, property: KProperty<*>, i: T) {
        if (t != i) {
            t = i
            action()
        }
    }
}