feat(cosmetics): Added a cosmetic previewer.

src/main/java/fr/hashtek/spigot/breakffa/cosmetics/Cosmetic.java

@@ -1,11 +1,12 @@
 package fr.hashtek.spigot.breakffa.cosmetics;
 
+import fr.hashtek.spigot.breakffa.cosmetics.types.AbstractCosmetic;
 import org.bukkit.Material;
 
 /**
  * @param   <T>     Cosmetic type
  */
-public class Cosmetic<T>
+public class Cosmetic<T extends AbstractCosmetic>
 {
 
     private final Material material;

src/main/java/fr/hashtek/spigot/breakffa/cosmetics/types/AbstractCosmetic.java

@@ -1,7 +1,29 @@
 package fr.hashtek.spigot.breakffa.cosmetics.types;
 
-/**
- * Cosmetic targeting interface.
- */
-public interface AbstractCosmetic
-{}
+import org.bukkit.entity.Player;
+
+public abstract class AbstractCosmetic
+{
+
+    /**
+     * Previews the cosmetic to a player.
+     * <br>
+     * Some cosmetic can't be previewed (like custom helmets) so,
+     * by default, this function is empty.
+     * For example, see {@link CosmeticTypeKSFX#preview(Player)}.
+     * <br>
+     * But it can be overriden by children!
+     *
+     * @param   player  Player
+     */
+    public void preview(Player player) {}
+
+    /**
+     * @return  True if cosmetic can be previewed.
+     */
+    public boolean canBePreviewed()
+    {
+        return false;
+    }
+
+}

src/main/java/fr/hashtek/spigot/breakffa/cosmetics/types/CosmeticTypeCustomHelmet.java

@@ -5,7 +5,7 @@
 import fr.hashtek.spigot.hashitem.HashItem;
 import org.bukkit.Material;
 
-public class CosmeticTypeCustomHelmet implements AbstractCosmetic
+public class CosmeticTypeCustomHelmet extends AbstractCosmetic
 {
 
     public enum CustomHelmet implements CosmeticCategoryArticles<CosmeticTypeCustomHelmet>

src/main/java/fr/hashtek/spigot/breakffa/cosmetics/types/CosmeticTypeKSFX.java

@@ -2,13 +2,15 @@
 
 import fr.hashtek.spigot.breakffa.cosmetics.Cosmetic;
 import fr.hashtek.spigot.breakffa.cosmetics.CosmeticCategoryArticles;
+import net.kyori.adventure.sound.SoundStop;
 import org.bukkit.Material;
 import org.bukkit.Sound;
+import org.bukkit.entity.Player;
 
 /**
  * KSFX stands for Kill SFX.
  */
-public class CosmeticTypeKSFX implements AbstractCosmetic
+public class CosmeticTypeKSFX extends AbstractCosmetic
 {
 
     public enum KillSfx implements CosmeticCategoryArticles<CosmeticTypeKSFX>
@@ -70,6 +72,20 @@ public CosmeticTypeKSFX(Sound sfx)
     }
 
 
+    @Override
+    public void preview(Player player)
+    {
+        player.stopSound(SoundStop.all());
+        player.playSound(player.getLocation(), this.getSfx(), 1, 1);
+    }
+
+    @Override
+    public boolean canBePreviewed()
+    {
+        return true;
+    }
+
+
     /**
      * @return  SFX
      */

src/main/java/fr/hashtek/spigot/breakffa/gui/cosmetics/GuiCosmeticsCategory.java

@@ -17,6 +17,7 @@
 import org.bukkit.Material;
 import org.bukkit.enchantments.Enchantment;
 import org.bukkit.entity.Player;
+import org.bukkit.event.inventory.ClickType;
 import org.bukkit.inventory.ItemStack;
 
 public abstract class GuiCosmeticsCategory<
@@ -154,6 +155,7 @@ private HashItem createCosmeticItem(
         CosmeticManager manager
     )
     {
+        final T cosmeticCosmetic = cosmetic.getCosmetic();
         final Cosmetic<T> currentCosmetic = currentCosmeticGetter.getGetter(manager).get();
 
         final HashItem item = new HashItem(cosmetic.getMaterial())
@@ -171,9 +173,20 @@ private HashItem createCosmeticItem(
             item.addEnchant(Enchantment.DURABILITY, 1);
         }
 
+        if (cosmeticCosmetic.canBePreviewed()) {
+            item.addLore(Component.text("right click 4 preview!!"));
+            item.addClickHandler(
+                new ClickHandler()
+                    .addClickTypes(ClickType.RIGHT, ClickType.SHIFT_RIGHT)
+                    .setClickAction((Player player, HashGui hashGui, ItemStack i, int slot) ->
+                        cosmeticCosmetic.preview(player)
+                    )
+            );
+        }
+
         item.addClickHandler(
             new ClickHandler()
-                .addAllClickTypes()
+                .addClickTypes(ClickType.LEFT, ClickType.SHIFT_LEFT)
                 .setClickAction((Player player, HashGui hashGui, ItemStack i, int slot) -> {
                     if (!(hashGui instanceof GuiCosmeticsCategory<?, ?> guiCosmeticsCategory)) {
                         return;