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[1.7.10] Detecting when player swaps held item


PegBeard
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I have a feeling this is a really simple thing to do and probably a dumb question, but I have been searching for a while and not really found what I am looking for.

 

What I want to do is, detect when the player selects an item (scrolls to it, or presses the hotbar number). I have attempted to check the player's currently equipped item and compare it to the previously equipped item (as in the last held item), but I couldn't find a method for previously equipped items.

 

I did attempt a LivingUpdateEvent, to check and store the held item, but it didn't seem like the most practical way to do it, so I was wondering if anyone could advise me on a better way to detect when the player changes their held item.

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Comparing current to previous is the only option. Any other way would require either ASM or quite some replacements to vanilla inventory system.

 

As to storin previous values:

You need to implements IExtendedEntityProperties, use PlayerTickEvent (note: pick one event.phase, otherwise event is ran twice), make comprasion to previous stack and then refresh.

 

You will probably have to save two fields:

player.inventory.currentItem to check if "wheel" slot is same as before. - if it changed from prev pick, item changed.

player.inventory.getCurrentItem() compare if previous ItemStack is same as new one (from current tick).

 

I fortog you can just "==", no need to save currentItem.

 

Links:

IEEP tutorial:

http://www.minecraftforum.net/forums/mapping-and-modding/mapping-and-modding-tutorials/1571567-1-7-2-1-6-4-eventhandler-and

1.7.10 is no longer supported by forge, you are on your own.

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    • Oh, Now that I see it better the error is different.  This is the error now i dont saw much of it: 2022-01-19 21:36:34,998 main WARN Advanced terminal features are not available in this environment [21:36:36] [main/INFO] [cp.mo.mo.Launcher/MODLAUNCHER]: ModLauncher running: args [--gameDir, ., --launchTarget, fmlserver, --fml.forgeVersion, 36.2.22, --fml.mcpVersion, 20210115.111550, --fml.mcVersion, 1.16.5, --fml.forgeGroup, net.minecraftforge] [21:36:36] [main/INFO] [cp.mo.mo.Launcher/MODLAUNCHER]: ModLauncher 8.0.9+86+master.3cf110c starting: java version 1.8.0_25 by Oracle Corporation [21:36:36] [main/WARN] [cp.mo.mo.SecureJarHandler/]: LEGACY JDK DETECTED, SECURED JAR HANDLING DISABLED [21:36:38] [main/INFO] [ne.mi.fm.lo.FixSSL/CORE]: Added Lets Encrypt root certificates as additional trust [21:36:38] [main/INFO] [mixin/]: SpongePowered MIXIN Subsystem Version=0.8.4 Source=file:/C:/Users/Lautaro/Desktop/server1/libraries/org/spongepowered/mixin/0.8.4/mixin-0.8.4.jar Service=ModLauncher Env=SERVER Exception in thread "main" [21:36:39] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]: java.lang.BootstrapMethodError: java.lang.NoClassDefFoundError: jdk/nashorn/api/scripting/ClassFilter [21:36:39] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at net.minecraftforge.coremod.NashornFactory.createEngine(NashornFactory.java:13) [21:36:39] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at net.minecraftforge.coremod.CoreModEngine.loadCoreMod(CoreModEngine.java:52) [21:36:39] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at net.minecraftforge.coremod.CoreModProvider.addCoreMod(CoreModProvider.java:12) [21:36:39] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at net.minecraftforge.fml.loading.LoadingModList$$Lambda$347/589987187.accept(Unknown Source) [21:36:39] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) [21:36:39] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1374) [21:36:39] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:580) [21:36:39] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at java.util.stream.ReferencePipeline$7$1.accept(ReferencePipeline.java:270) [21:36:39] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193) [21:36:39] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193) [21:36:39] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1374) [21:36:39] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:512) [21:36:39] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:502) [21:36:39] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) [21:36:39] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) [21:36:39] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) [21:36:39] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418) [21:36:39] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at net.minecraftforge.fml.loading.LoadingModList.addCoreMods(LoadingModList.java:85) [21:36:39] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at net.minecraftforge.fml.loading.moddiscovery.ModDiscoverer.discoverMods(ModDiscoverer.java:130) [21:36:39] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at net.minecraftforge.fml.loading.FMLLoader.beginModScan(FMLLoader.java:216) [21:36:39] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at net.minecraftforge.fml.loading.FMLServiceProvider.runScan(FMLServiceProvider.java:107) [21:36:39] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at cpw.mods.modlauncher.TransformationServiceDecorator.runScan(TransformationServiceDecorator.java:114) [21:36:39] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at cpw.mods.modlauncher.TransformationServicesHandler.lambda$runScanningTransformationServices$8(TransformationServicesHandler.java:115) [21:36:39] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at cpw.mods.modlauncher.TransformationServicesHandler$$Lambda$185/259564670.apply(Unknown Source) [21:36:39] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at java.util.stream.ReferencePipeline$7$1.accept(ReferencePipeline.java:267) [21:36:39] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at java.util.HashMap$ValueSpliterator.forEachRemaining(HashMap.java:1612) [21:36:39] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:512) [21:36:39] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:502) [21:36:39] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708) [21:36:39] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) [21:36:39] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499) [21:36:39] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at cpw.mods.modlauncher.TransformationServicesHandler.runScanningTransformationServices(TransformationServicesHandler.java:116) [21:36:39] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at cpw.mods.modlauncher.TransformationServicesHandler.initializeTransformationServices(TransformationServicesHandler.java:63) [21:36:39] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at cpw.mods.modlauncher.Launcher.run(Launcher.java:76) [21:36:39] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at cpw.mods.modlauncher.Launcher.main(Launcher.java:66) [21:36:39] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at net.minecraftforge.server.ServerMain$Runner.runLauncher(ServerMain.java:63) [21:36:39] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at net.minecraftforge.server.ServerMain$Runner.access$100(ServerMain.java:60) [21:36:39] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at net.minecraftforge.server.ServerMain.main(ServerMain.java:57) [21:36:39] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1061]: Caused by: java.lang.NoClassDefFoundError: jdk/nashorn/api/scripting/ClassFilter [21:36:39] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1061]:       ... 38 more [21:36:39] [main/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:643]: Caused by: java.lang.ClassNotFoundException: jdk.nashorn.api.scripting.ClassFilter [21:36:39] [main/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:643]:    at java.net.URLClassLoader$1.run(URLClassLoader.java:372) [21:36:39] [main/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:643]:    at java.net.URLClassLoader$1.run(URLClassLoader.java:361) [21:36:39] [main/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:643]:    at java.security.AccessController.doPrivileged(Native Method) [21:36:39] [main/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:643]:    at java.net.URLClassLoader.findClass(URLClassLoader.java:360) [21:36:39] [main/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:643]:    at java.lang.ClassLoader.loadClass(ClassLoader.java:424) [21:36:39] [main/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:643]:    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) [21:36:39] [main/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:643]:    at java.lang.ClassLoader.loadClass(ClassLoader.java:357) [21:36:39] [main/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:643]:    ... 38 more
    • i tried that but it says the same error
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