Added Explosion Start and Detonate events to control explosion.

src/main/java/net/minecraftforge/event/ForgeEventFactory.java

@@ -3,7 +3,9 @@ package net.minecraftforge.event;
 import java.io.File;
 import java.util.ArrayList;
 import java.util.HashMap;
+import java.util.Iterator;
 import java.util.List;
+
 import net.minecraft.block.Block;
 import net.minecraft.block.state.IBlockState;
 import net.minecraft.entity.Entity;
@@ -21,6 +23,8 @@ import net.minecraft.util.DamageSource;
 import net.minecraft.util.EnumFacing;
 import net.minecraft.util.IChatComponent;
 import net.minecraft.util.MovingObjectPosition;
+import net.minecraft.util.Vec3;
+import net.minecraft.world.Explosion;
 import net.minecraft.world.World;
 import net.minecraft.world.WorldServer;
 import net.minecraft.world.biome.BiomeGenBase;
@@ -57,6 +61,7 @@ import net.minecraftforge.event.entity.player.UseHoeEvent;
 import net.minecraftforge.event.world.BlockEvent;
 import net.minecraftforge.event.world.BlockEvent.MultiPlaceEvent;
 import net.minecraftforge.event.world.BlockEvent.PlaceEvent;
+import net.minecraftforge.event.world.ExplosionEvent;
 import net.minecraftforge.event.world.WorldEvent;
 import net.minecraftforge.fml.common.ObfuscationReflectionHelper;
 import net.minecraftforge.fml.common.eventhandler.Event;
@@ -346,4 +351,25 @@ public class ForgeEventFactory
     {
         MinecraftForge.EVENT_BUS.post(new net.minecraftforge.event.entity.player.PlayerEvent.Clone(player, oldPlayer, wasDeath));
     }
+
+    public static boolean onExplosionStart(World world, Explosion explosion)
+    {
+        return MinecraftForge.EVENT_BUS.post(new ExplosionEvent.Start(world, explosion));
+    }
+
+    public static void onExplosionDetonate(World world, Explosion explosion, List<Entity> list, double diameter)
+    {
+        //Filter entities to only those who are effected, to prevent modders from seeing more then will be hurt.
+        /* Enable this if we get issues with modders looping to much.
+        Iterator<Entity> itr = list.iterator();
+        Vec3 p = explosion.getPosition();
+        while (itr.hasNext())
+        {
+            Entity e = itr.next();
+            double dist = e.getDistance(p.xCoord, p.yCoord, p.zCoord) / diameter;
+            if (e.func_180427_aV() || dist > 1.0F) itr.remove();
+        }
+        */
+        MinecraftForge.EVENT_BUS.post(new ExplosionEvent.Detonate(world, explosion, list));
+    }
 }

src/main/java/net/minecraftforge/event/world/ExplosionEvent.java

@@ -0,0 +1,76 @@
+package net.minecraftforge.event.world;
+
+import java.util.List;
+
+import net.minecraftforge.fml.common.eventhandler.Cancelable;
+import net.minecraftforge.fml.common.eventhandler.Event;
+import net.minecraft.entity.Entity;
+import net.minecraft.util.BlockPos;
+import net.minecraft.world.Explosion;
+import net.minecraft.world.World;
+
+/** ExplosionEvent triggers when an explosion happens in the world.<br>
+ * <br>
+ * ExplosionEvent.Start is fired before the explosion actually occurs.<br>
+ * ExplosionEvent.Detonate is fired once the explosion has a list of affected blocks and entities.<br>
+ * <br>
+ * ExplosionEvent.Start is {@link Cancelable}.<br>
+ * ExplosionEvent.Detonate can modify the affected blocks and entities.<br>
+ * Children do not use {@link HasResult}.<br>
+ * Children of this event are fired on the {@link MinecraftForge#EVENT_BUS}.<br>
+ */
+public class ExplosionEvent extends Event
+{
+    public final World world;
+    public final Explosion explosion;
+
+    public ExplosionEvent(World world, Explosion explosion)
+    {
+        this.world = world;
+        this.explosion = explosion;
+    }
+
+    /** ExplosionEvent.Start is fired before the explosion actually occurs.  Canceling this event will stop the explosion.<br>
+     * <br>
+     * This event is {@link Cancelable}.<br>
+     * This event does not use {@link HasResult}.<br>
+     * This event is fired on the {@link MinecraftForge#EVENT_BUS}.<br>
+     */
+    @Cancelable
+    public static class Start extends ExplosionEvent
+    {
+        public Start(World world, Explosion explosion)
+        {
+            super(world, explosion);
+        }
+    }
+
+    /** ExplosionEvent.Detonate is fired once the explosion has a list of affected blocks and entities.  These lists can be modified to change the outcome.<br>
+     * <br>
+     * This event is not {@link Cancelable}.<br>
+     * This event does not use {@link HasResult}.<br>
+     * This event is fired on the {@link MinecraftForge#EVENT_BUS}.<br>
+     */
+    public static class Detonate extends ExplosionEvent
+    {
+        private final List<Entity> entityList;
+
+        public Detonate(World world, Explosion explosion, List<Entity> entityList)
+        {
+            super(world, explosion);
+            this.entityList = entityList;
+        }
+
+        /** return the list of blocks affected by the explosion. */
+        public List<BlockPos> getAffectedBlocks()
+        {
+            return explosion.func_180343_e();
+        }
+
+        /** return the list of entities affected by the explosion. */
+        public List<Entity> getAffectedEntities()
+        {
+            return entityList;
+        }
+    }
+}