Create InventoryGUISpaceCompound.kt

src/main/kotlin/net/axay/kspigot/inventory/elements/InventoryGUISpaceCompound.kt

@@ -0,0 +1,79 @@
+@file:Suppress("MemberVisibilityCanBePrivate", "unused")
+
+package net.axay.kspigot.inventory.elements
+
+import net.axay.kspigot.inventory.*
+import org.bukkit.Material
+import org.bukkit.inventory.ItemStack
+
+class InventoryGUISpaceCompoundElement<T : ForInventory, E>(
+    private val compound: InventoryGUISpaceCompound<T, E>
+) : InventoryGUIElement<T>() {
+
+    override fun getItemStack(slot: Int) = compound.getItemStack(slot)
+
+    override fun onClickElement(clickEvent: InventoryGUIClickEvent<T>) {
+        compound.onClickElement(clickEvent)
+    }
+
+}
+
+class InventoryGUISpaceCompound<T : ForInventory, E> internal constructor(
+    private val invType: InventoryType<T>,
+    private val iconGenerator: (E) -> ItemStack,
+    private val onClick: (InventoryGUIClickEvent<T>, E) -> Unit
+) {
+
+    private val content = ArrayList<E>()
+    private val internalSlots = ArrayList<Int>()
+
+    private var contentSort: () -> Unit = { }
+
+    // TODO add "scrolling" functionality
+
+    // TODO take current scroll progress into account
+    private fun contentAtSlot(slot: Int) = content.getOrNull(internalSlots.indexOf(slot))
+
+    internal fun getItemStack(slot: Int): ItemStack {
+        return contentAtSlot(slot)?.let { return@let iconGenerator.invoke(it) }
+            ?: ItemStack(Material.AIR)
+    }
+
+    internal fun onClickElement(clickEvent: InventoryGUIClickEvent<T>) {
+        val element = contentAtSlot(clickEvent.bukkitEvent.slot) ?: return
+        onClick.invoke(clickEvent, element)
+    }
+
+    internal fun addSlots(slots: InventorySlotCompound<T>) {
+        internalSlots += slots.realSlotsWithInvType(invType)
+        internalSlots.sort()
+    }
+
+    /**
+     * Defines the sort behaviour which gets applied to the content
+     * automatically.
+     */
+    fun <R : Comparable<R>> sortContentBy(reverse: Boolean = false, selector: (E) -> R?) {
+        contentSort = {
+            if (!reverse) content.sortBy(selector) else content.sortByDescending(selector)
+        }
+        contentSort.invoke()
+    }
+
+    /**
+     * Adds a new element to the compound.
+     */
+    fun addContent(element: E) {
+        addContent(listOf(element))
+    }
+
+    /**
+     * Adds new elements to the compound.
+     */
+    fun addContent(elements: Collection<E>) {
+        content += elements
+        contentSort.invoke()
+        // TODO reload GUIs using this compound at this time
+    }
+
+}