Added tooltip handler system

build.properties

@@ -1,4 +1,4 @@
-bdlib.version=1.9.0
+bdlib.version=1.9.1
 curseforge.id=70496
 
 minecraft.version=1.7.10

src/net/bdew/lib/BdLib.scala

@@ -13,6 +13,7 @@ import cpw.mods.fml.common.Mod.EventHandler
 import cpw.mods.fml.common.event.{FMLPreInitializationEvent, FMLServerStartingEvent, FMLServerStoppingEvent}
 import cpw.mods.fml.common.{FMLCommonHandler, Mod}
 import net.bdew.lib.multiblock.network.NetHandler
+import net.bdew.lib.tooltip.TooltipHandler
 import net.minecraft.command.CommandHandler
 import org.apache.logging.log4j.Logger
 
@@ -37,6 +38,9 @@ object BdLib {
     log.debug("List of loaded APIs: " + ApiReporter.APIs)
     FMLCommonHandler.instance().registerCrashCallable(ApiReporter)
     NetHandler.init()
+    if (ev.getSide.isClient) {
+      TooltipHandler.init()
+    }
   }
 
   @EventHandler

src/net/bdew/lib/tooltip/FluidTooltipProvider.scala

@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) bdew, 2013 - 2015
+ * https://github.com/bdew/bdlib
+ *
+ * This mod is distributed under the terms of the Minecraft Mod Public
+ * License 1.0, or MMPL. Please check the contents of the license located in
+ * http://bdew.net/minecraft-mod-public-license/
+ */
+
+package net.bdew.lib.tooltip
+
+import net.minecraft.item.ItemStack
+import net.minecraftforge.fluids.{FluidContainerRegistry, FluidStack, IFluidContainerItem}
+
+trait FluidTooltipProvider extends TooltipProvider {
+  def getFluid(is: ItemStack): Option[FluidStack] = {
+    if (is.getItem.isInstanceOf[IFluidContainerItem]) {
+      Option(is.getItem.asInstanceOf[IFluidContainerItem].getFluid(is))
+    } else {
+      Option(FluidContainerRegistry.getFluidForFilledItem(is))
+    }
+  }
+
+  override def shouldHandleTooltip(stack: ItemStack): Boolean = getFluid(stack) exists shouldHandleTooltip
+  override def handleTooltip(stack: ItemStack, advanced: Boolean, shift: Boolean): Iterable[String] =
+    getFluid(stack) map (f => handleTooltip(f, advanced, shift)) getOrElse Iterable.empty
+
+  def shouldHandleTooltip(fluid: FluidStack): Boolean
+  def handleTooltip(fluid: FluidStack, advanced: Boolean, shift: Boolean): Iterable[String]
+}

src/net/bdew/lib/tooltip/TooltipHandler.scala

@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) bdew, 2013 - 2015
+ * https://github.com/bdew/bdlib
+ *
+ * This mod is distributed under the terms of the Minecraft Mod Public
+ * License 1.0, or MMPL. Please check the contents of the license located in
+ * http://bdew.net/minecraft-mod-public-license/
+ */
+
+package net.bdew.lib.tooltip
+
+import cpw.mods.fml.common.eventhandler.SubscribeEvent
+import net.bdew.lib.{BdLib, Client}
+import net.minecraftforge.common.MinecraftForge
+import net.minecraftforge.event.entity.player.ItemTooltipEvent
+
+object TooltipHandler {
+  var registry = List.empty[TooltipProvider]
+
+  def init() {
+    MinecraftForge.EVENT_BUS.register(this)
+  }
+
+  def register(p: TooltipProvider) = registry :+= p
+
+  @SubscribeEvent
+  def handleTooltipEvent(ev: ItemTooltipEvent): Unit = {
+    if (ev.itemStack == null || ev.itemStack.getItem == null) return
+
+    val toAdd = for (provider <- registry) yield {
+      try {
+        if (provider.shouldHandleTooltip(ev.itemStack))
+          Some(provider.handleTooltip(ev.itemStack, ev.showAdvancedItemTooltips, Client.shiftDown))
+        else
+          None
+      } catch {
+        case t: Throwable =>
+          BdLib.logErrorException("Error in tooltip provider %s", t, provider)
+          None
+      }
+    }
+
+    import scala.collection.JavaConversions._
+
+    ev.toolTip ++= toAdd.flatten.flatten
+  }
+}

src/net/bdew/lib/tooltip/TooltipProvider.scala

@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) bdew, 2013 - 2015
+ * https://github.com/bdew/bdlib
+ *
+ * This mod is distributed under the terms of the Minecraft Mod Public
+ * License 1.0, or MMPL. Please check the contents of the license located in
+ * http://bdew.net/minecraft-mod-public-license/
+ */
+
+package net.bdew.lib.tooltip
+
+import net.minecraft.item.ItemStack
+
+trait TooltipProvider {
+  def shouldHandleTooltip(stack: ItemStack): Boolean
+  def handleTooltip(stack: ItemStack, advanced: Boolean, shift: Boolean): Iterable[String]
+}
+