kotlin-delegate

问题 I have created a custom property dedicated to holding properties of the view that require invalidate() call for one of my projects: class InvalidatingProperty<T>(private var _value: T) { operator fun getValue(thisRef: View, property: KProperty<*>): T { return _value } operator fun setValue(thisRef: View, property: KProperty<*>, value: T) { _value = value thisRef.invalidate() } } In another project, I wanted to reuse some of my previous work, so i copied the views and their dependencies,

问题 I have created a custom property dedicated to holding properties of the view that require invalidate() call for one of my projects: class InvalidatingProperty<T>(private var _value: T) { operator fun getValue(thisRef: View, property: KProperty<*>): T { return _value } operator fun setValue(thisRef: View, property: KProperty<*>, value: T) { _value = value thisRef.invalidate() } } In another project, I wanted to reuse some of my previous work, so i copied the views and their dependencies,

问题 I'm trying to combine delegates/observable with vetoable (which isn't a problem after looking at the source kotlin.properties.Delegates.kt), but things got hairy when trying to also store the properties in a map. Or in other words, how to combine these three: var k1: Int by Delegates.observable(0) { property, oldValue, newValue -> println("Hi from k1 observer") } var k2:Int by Delegates.vetoable(0) {property, oldValue, newValue -> println("Hi from k2 more-than check") oldValue > newValue }

问题 I'm trying to combine delegates/observable with vetoable (which isn't a problem after looking at the source kotlin.properties.Delegates.kt), but things got hairy when trying to also store the properties in a map. Or in other words, how to combine these three: var k1: Int by Delegates.observable(0) { property, oldValue, newValue -> println("Hi from k1 observer") } var k2:Int by Delegates.vetoable(0) {property, oldValue, newValue -> println("Hi from k2 more-than check") oldValue > newValue }