SparklyPaperMC/patches/server/0024-Add-PlayerPreMoveEvent.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: MrPowerGamerBR <git@mrpowergamerbr.com>
Date: Wed, 8 Jan 2025 22:48:04 -0300
Subject: [PATCH] Add PlayerPreMoveEvent


diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
index ac0af5da6646df1cfe66aead3f945a9f77efa5de..3a74c35da37326ee52bc7ccee79791732cb2e092 100644
--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
@@ -1462,7 +1462,7 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
                             d6 = d0 - this.lastGoodX; // Paper - diff on change, used for checking large move vectors above
                             d7 = d1 - this.lastGoodY; // Paper - diff on change, used for checking large move vectors above
                             d8 = d2 - this.lastGoodZ; // Paper - diff on change, used for checking large move vectors above
-                            boolean flag1 = d7 > 0.0D;
+                            boolean flag1 = d7 > 0.0D; // SparklyPaper - diff on change, used to reset the fall distance, checks if d7 is > 0.0D (player is moving upwards)
 
                             if (this.player.onGround() && !packet.isOnGround() && flag1) {
                                 // Paper start - Add PlayerJumpEvent
@@ -1498,7 +1498,37 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
                             boolean flag2 = this.player.verticalCollisionBelow;
 
                             this.player.move(MoverType.PLAYER, new Vec3(d6, d7, d8));
-                            this.player.onGround = packet.isOnGround(); // CraftBukkit - SPIGOT-5810, SPIGOT-5835, SPIGOT-6828: reset by this.player.move
+                            // SparklyPaper start - Add PlayerPreMoveEvent event
+                            boolean isOnGround = packet.isOnGround();
+                            boolean horizontalCollision = packet.horizontalCollision();
+                            if (net.sparklypower.sparklypaper.event.player.PlayerPreMoveEvent.getHandlerList().getRegisteredListeners().length != 0) {
+                                Player player = this.getCraftPlayer();
+                                Location from = new Location(player.getWorld(), lastPosX, lastPosY, lastPosZ, lastYaw, lastPitch); // Get the Players previous Event location.
+                                Location to = player.getLocation().clone(); // Start off the To location as the Players current location.
+
+                                // If the packet contains movement information then we update the To location with the correct XYZ.
+                                if (packet.hasPos) {
+                                    to.setX(packet.x);
+                                    to.setY(packet.y);
+                                    to.setZ(packet.z);
+                                }
+
+                                // If the packet contains look information then we update the To location with the correct Yaw & Pitch.
+                                if (packet.hasRot) {
+                                    to.setYaw(packet.yRot);
+                                    to.setPitch(packet.xRot);
+                                }
+
+                                net.sparklypower.sparklypaper.event.player.PlayerPreMoveEvent event = new net.sparklypower.sparklypaper.event.player.PlayerPreMoveEvent(player, from, to, packet.isOnGround(), packet.horizontalCollision(), flag1);
+
+                                if (event.callEvent()) {
+                                    isOnGround = event.isOnGround();
+                                    horizontalCollision = event.isHorizontalCollision();
+                                    flag1 = event.isResetFallDistance();
+                                }
+                            }
+                            // SparklyPaper end
+                            this.player.onGround = isOnGround; // CraftBukkit - SPIGOT-5810, SPIGOT-5835, SPIGOT-6828: reset by this.player.move // SparklyPaper - Add PlayerPreMoveEvent
                             boolean didCollide = toX != this.player.getX() || toY != this.player.getY() || toZ != this.player.getZ(); // Paper - needed here as the difference in Y can be reset - also note: this is only a guess at whether collisions took place, floating point errors can make this true when it shouldn't be...
                             // Paper start - prevent position desync
                             if (this.awaitingPositionFromClient != null) {
@@ -1551,7 +1581,7 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
                             if (teleportBack) {
                             // Paper end - Add fail move event
                                 this.internalTeleport(d3, d4, d5, f, f1); // CraftBukkit - SPIGOT-1807: Don't call teleport event, when the client thinks the player is falling, because the chunks are not loaded on the client yet.
-                                this.player.doCheckFallDamage(this.player.getX() - d3, this.player.getY() - d4, this.player.getZ() - d5, packet.isOnGround());
+                                this.player.doCheckFallDamage(this.player.getX() - d3, this.player.getY() - d4, this.player.getZ() - d5, isOnGround); // SparklyPaper - Add PlayerPreMoveEvent
                             } else {
                                 // CraftBukkit start - fire PlayerMoveEvent
                                 // Reset to old location first
@@ -1626,15 +1656,15 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
                                 this.player.serverLevel().getChunkSource().move(this.player);
                                 Vec3 vec3d = new Vec3(this.player.getX() - d3, this.player.getY() - d4, this.player.getZ() - d5);
 
-                                this.player.setOnGroundWithMovement(packet.isOnGround(), packet.horizontalCollision(), vec3d);
-                                this.player.doCheckFallDamage(this.player.getX() - d3, this.player.getY() - d4, this.player.getZ() - d5, packet.isOnGround());
+                                this.player.setOnGroundWithMovement(isOnGround, horizontalCollision, vec3d); // SparklyPaper start - PlayerPreMoveEvent
+                                this.player.doCheckFallDamage(this.player.getX() - d3, this.player.getY() - d4, this.player.getZ() - d5, isOnGround); // SparklyPaper - PlayerPreMoveEvent
                                 this.player.recordMovementThroughBlocks(new Vec3(d3, d4, d5), this.player.position());
                                 this.handlePlayerKnownMovement(vec3d);
                                 if (flag1) {
                                     this.player.resetFallDistance();
                                 }
 
-                                if (packet.isOnGround() || this.player.hasLandedInLiquid() || this.player.onClimbable() || this.player.isSpectator() || flag || flag4) {
+                                if (isOnGround || this.player.hasLandedInLiquid() || this.player.onClimbable() || this.player.isSpectator() || flag || flag4) { // SparklyPaper - PlayerPreMoveEvent
                                     this.player.tryResetCurrentImpulseContext();
                                 }