eventlib: Initial commit

eventlib/build.gradle.kts

@@ -0,0 +1,2 @@
+group = "io.github.com6235"
+version = "1.0-SNAPSHOT"

eventlib/src/main/kotlin/Event.kt

@@ -0,0 +1,13 @@
+package io.github.com6235.eventlib
+
+open class Event<IN : Any> {
+    protected val listeners = mutableListOf<(IN?) -> Unit>()
+
+    operator fun invoke(args: IN) = listeners.forEach { it(args) }
+
+    operator fun invoke() = listeners.forEach { it(null) }
+
+    operator fun plusAssign(func: (IN?) -> Unit) {
+        listeners.add(func)
+    }
+}

eventlib/src/test/kotlin/EventTest.kt

@@ -0,0 +1,48 @@
+import io.github.com6235.eventlib.Event
+import org.junit.jupiter.api.Test
+import kotlin.test.assertEquals
+
+class EventTest {
+    @Test
+    fun invokeTest() {
+        val event = Event<String>()
+        val array = arrayOf<Any?>(null, null)
+        event += {
+            array[0] = it!!.firstOrNull()
+        }
+        event += {
+            array[1] = it!!.lastOrNull()
+        }
+        event("fire")
+        assertEquals('f', array[0])
+        assertEquals('e', array[1])
+    }
+
+    data class EventArgs(val old: Int, val new: Int)
+
+    val changeEvent = Event<EventArgs>()
+    private var _value = 0
+    var value: Int
+        get() = _value
+        set(i) {
+            changeEvent(EventArgs(_value, i))
+            _value = i
+        }
+
+    @Test
+    fun test2() {
+        val oldVals = mutableMapOf<Int, Int>()
+        changeEvent += {
+            val args = it!!
+            oldVals[args.new] = args.old
+        }
+        value = 21
+        value = 15
+        value = 99
+        value = 69
+        assertEquals(0, oldVals[21])
+        assertEquals(21, oldVals[15])
+        assertEquals(15, oldVals[99])
+        assertEquals(99, oldVals[69])
+    }
+}

settings.gradle.kts

@@ -2,4 +2,4 @@ plugins {
     id("org.gradle.toolchains.foojay-resolver-convention") version "0.5.0"
 }
 rootProject.name = "maven-libs"
-include("tgbotter", "configurator")
+include("tgbotter", "configurator", "eventlib")