Add PlayerItemFrameChangeEvent

paper-api/src/main/java/io/papermc/paper/event/player/PlayerItemFrameChangeEvent.java

@@ -0,0 +1,99 @@
+package io.papermc.paper.event.player;
+
+import org.bukkit.entity.ItemFrame;
+import org.bukkit.entity.Player;
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.HandlerList;
+import org.bukkit.event.player.PlayerEvent;
+import org.bukkit.inventory.ItemStack;
+import org.jetbrains.annotations.ApiStatus;
+import org.jspecify.annotations.NullMarked;
+import org.jspecify.annotations.Nullable;
+
+/**
+ * Called when an {@link ItemFrame} is having an item rotated, added, or removed from it.
+ */
+@NullMarked
+public class PlayerItemFrameChangeEvent extends PlayerEvent implements Cancellable {
+
+    private static final HandlerList HANDLER_LIST = new HandlerList();
+
+    private final ItemFrame itemFrame;
+    private final ItemFrameChangeAction action;
+    private ItemStack itemStack;
+
+    private boolean cancelled;
+
+    @ApiStatus.Internal
+    public PlayerItemFrameChangeEvent(final Player player, final ItemFrame itemFrame, final ItemStack itemStack, final ItemFrameChangeAction action) {
+        super(player);
+        this.itemFrame = itemFrame;
+        this.itemStack = itemStack;
+        this.action = action;
+    }
+
+    /**
+     * Gets the {@link ItemFrame} involved in this event.
+     *
+     * @return the {@link ItemFrame}
+     */
+    public ItemFrame getItemFrame() {
+        return this.itemFrame;
+    }
+
+    /**
+     * Gets the {@link ItemStack} involved in this event.
+     * This is the item being added, rotated, or removed from the {@link ItemFrame}.
+     * <p>
+     * If this method returns air, then the resulting item in the ItemFrame will be empty.
+     *
+     * @return the {@link ItemStack} being added, rotated, or removed
+     */
+    public ItemStack getItemStack() {
+        return this.itemStack;
+    }
+
+    /**
+     * Sets the {@link ItemStack} that this {@link ItemFrame} holds.
+     * If {@code null} is provided, the ItemStack will become air and the result in the ItemFrame will be empty.
+     *
+     * @param itemStack {@link ItemFrame} item
+     */
+    public void setItemStack(final @Nullable ItemStack itemStack) {
+        this.itemStack = itemStack == null ? ItemStack.empty() : itemStack;
+    }
+
+    /**
+     * Gets the action that was performed on this {@link ItemFrame}.
+     *
+     * @return action performed on the item frame in this event
+     */
+    public ItemFrameChangeAction getAction() {
+        return this.action;
+    }
+
+    @Override
+    public boolean isCancelled() {
+        return this.cancelled;
+    }
+
+    @Override
+    public void setCancelled(final boolean cancel) {
+        this.cancelled = cancel;
+    }
+
+    @Override
+    public HandlerList getHandlers() {
+        return HANDLER_LIST;
+    }
+
+    public static HandlerList getHandlerList() {
+        return HANDLER_LIST;
+    }
+
+    public enum ItemFrameChangeAction {
+        PLACE,
+        REMOVE,
+        ROTATE
+    }
+}