Signed-off-by: Chaoscaot <max@maxsp.de>

@@ -0,0 +69,4 @@
+
+        onClose()
+
+        InventoryClickEvent.getHandlerList().unregister(this)

@@ -0,0 +37,4 @@
+        render()
+    }
+
+    var item: ItemStack = ItemStack.of(Material.AIR)

@@ -0,0 +70,4 @@
+        @EventHandler
+        fun onInventoryClick(event: InventoryClickEvent) {
+            if (event.inventory.holder is UIWindow) {
+                val window = event.inventory.holder as UIWindow

@@ -39,2 +39,4 @@
     dependsOn(":SchematicSystem:shadowJar")
+    dependsOn(":KotlinCore:shadowJar")
     template = "Bau21"
+    worldName = "73"

@@ -34,6 +34,7 @@ dependencies {
     compileOnly(libs.classindex)
     annotationProcessor(libs.classindex)
     compileOnly(project(":SpigotCore", "default"))
+    compileOnly(project(":KotlinCore", "default"))

@@ -37,5 +37,6 @@ tasks.register<DevServer>("DevBau21") {
     dependsOn(":SpigotCore:shadowJar")
     dependsOn(":BauSystem:shadowJar")
     dependsOn(":SchematicSystem:shadowJar")
+    dependsOn(":KotlinCore:shadowJar")

@@ -1,3 +1,5 @@
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompile

@@ -0,0 +22,4 @@
+import kotlin.properties.ReadWriteProperty
+import kotlin.reflect.KProperty
+
+class Observer<T>(private var value: T): ReadWriteProperty<Any?, T> {

@@ -0,0 +45,4 @@
+        bukkitInv = KotlinCore.plugin.server.createInventory(this, size * 9, Component.translatable(title))
+    }
+
+    constructor(type: InventoryType, title: String, player: Player, render: WindowContext.() -> Unit): this(player, render) {

@@ -0,0 +33,4 @@
+    }
+
+    override fun resetSlot(x: Int, y: Int) {
+        window.bukkitInv.setItem(x + y * 9, ItemStack.of(Material.AIR))

@@ -0,0 +41,4 @@
+        return this
+    }
+
+    fun listen(callback: (T) -> Unit): () -> Unit {

@@ -0,0 +58,4 @@
+    }
+}
+
+class Observer<T>(private var value: T): ReadWriteProperty<Any?, T>, Observable<T>() {

@@ -0,0 +19,4 @@
+
+package de.steamwar.kotlin.ui
+
+abstract class ObserverListener {