Add slot locking

src/main/kotlin/moe/nea/firmament/events/HandledScreenKeyPressedEvent.kt

@@ -0,0 +1,10 @@
+package moe.nea.firmament.events
+
+import net.minecraft.client.option.KeyBinding
+
+data class HandledScreenKeyPressedEvent(val keyCode: Int, val scanCode: Int, val modifiers: Int) : FirmamentEvent.Cancellable() {
+    companion object : FirmamentEventBus<HandledScreenKeyPressedEvent>()
+    fun matches(keyBinding: KeyBinding): Boolean {
+        return keyBinding.matchesKey(keyCode, scanCode)
+    }
+}

src/main/kotlin/moe/nea/firmament/events/IsSlotProtectedEvent.kt

@@ -0,0 +1,26 @@
+package moe.nea.firmament.events
+
+import net.minecraft.screen.slot.Slot
+import net.minecraft.text.Text
+import moe.nea.firmament.util.CommonSoundEffects
+import moe.nea.firmament.util.MC
+
+data class IsSlotProtectedEvent(
+    val slot: Slot, var isProtected: Boolean = false
+) : FirmamentEvent() {
+    companion object : FirmamentEventBus<IsSlotProtectedEvent>() {
+        @JvmStatic
+        fun shouldBlockInteraction(slot: Slot): Boolean {
+            return publish(IsSlotProtectedEvent(slot)).isProtected.also {
+                if (it) {
+                    MC.player?.sendMessage(Text.translatable("firmament.protectitem").append(slot.stack.name))
+                    CommonSoundEffects.playFailure()
+                }
+            }
+        }
+    }
+
+    fun protect() {
+        isProtected = true
+    }
+}

src/main/kotlin/moe/nea/firmament/events/SlotRenderEvents.kt

@@ -0,0 +1,32 @@
+package moe.nea.firmament.events
+
+import net.minecraft.client.util.math.MatrixStack
+import net.minecraft.screen.slot.Slot
+
+interface SlotRenderEvents {
+    val matrices: MatrixStack
+    val slot: Slot
+    val mouseX: Int
+    val mouseY: Int
+    val delta: Float
+
+    data class Before(
+        override val matrices: MatrixStack, override val slot: Slot,
+        override val mouseX: Int,
+        override val mouseY: Int,
+        override val delta: Float
+    ) : FirmamentEvent(),
+        SlotRenderEvents {
+        companion object : FirmamentEventBus<Before>()
+    }
+
+    data class After(
+        override val matrices: MatrixStack, override val slot: Slot,
+        override val mouseX: Int,
+        override val mouseY: Int,
+        override val delta: Float
+    ) : FirmamentEvent(),
+        SlotRenderEvents {
+        companion object : FirmamentEventBus<After>()
+    }
+}