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package org.bukkit.event.inventory;
import java.util.Collections;
import java.util.Map;
import java.util.Set;
import org.apache.commons.lang.Validate;
import org.bukkit.Location;
import org.bukkit.entity.HumanEntity;
import org.bukkit.entity.Player;
import org.bukkit.event.HandlerList;
import org.bukkit.inventory.Inventory;
import org.bukkit.inventory.InventoryView;
import org.bukkit.inventory.ItemStack;
import org.bukkit.plugin.Plugin;
import org.bukkit.scheduler.BukkitScheduler;
import com.google.common.collect.ImmutableSet;
/**
* This event is called when the player drags an item in their cursor across
* the inventory. The ItemStack is distributed across the slots the
* HumanEntity dragged over. The method of distribution is described by the
* DragType returned by {@link #getType()}.
* <p>
* Canceling this event will result in none of the changes described in
* {@link #getNewItems()} being applied to the Inventory.
* <p>
* Because InventoryDragEvent occurs within a modification of the Inventory,
* not all Inventory related methods are safe to use.
* <p>
* The following should never be invoked by an EventHandler for
* InventoryDragEvent using the HumanEntity or InventoryView associated with
* this event.
* <ul>
* <li>{@link HumanEntity#closeInventory()}
* <li>{@link HumanEntity#openInventory(Inventory)}
* <li>{@link HumanEntity#openWorkbench(Location, boolean)}
* <li>{@link HumanEntity#openEnchanting(Location, boolean)}
* <li>{@link InventoryView#close()}
* </ul>
* To invoke one of these methods, schedule a task using
* {@link BukkitScheduler#runTask(Plugin, Runnable)}, which will run the task
* on the next tick. Also be aware that this is not an exhaustive list, and
* other methods could potentially create issues as well.
* <p>
* Assuming the EntityHuman associated with this event is an instance of a
* Player, manipulating the MaxStackSize or contents of an Inventory will
* require an Invocation of {@link Player#updateInventory()}.
* <p>
* Any modifications to slots that are modified by the results of this
* InventoryDragEvent will be overwritten. To change these slots, this event
* should be cancelled and the changes applied. Alternatively, scheduling a
* task using {@link BukkitScheduler#runTask(Plugin, Runnable)}, which would
* execute the task on the next tick, would work as well.
*/
public class InventoryDragEvent extends InventoryInteractEvent {
private static final HandlerList handlers = new HandlerList();
private final DragType type;
private final Map<Integer, ItemStack> addedItems;
private final Set<Integer> containerSlots;
private final ItemStack oldCursor;
private ItemStack newCursor;
public InventoryDragEvent(InventoryView what, ItemStack newCursor, ItemStack oldCursor, boolean right, Map<Integer, ItemStack> slots) {
super(what);
Validate.notNull(oldCursor);
Validate.notNull(slots);
type = right ? DragType.SINGLE : DragType.EVEN;
this.newCursor = newCursor;
this.oldCursor = oldCursor;
this.addedItems = slots;
ImmutableSet.Builder<Integer> b = ImmutableSet.builder();
for (Integer slot : slots.keySet()) {
b.add(what.convertSlot(slot));
}
this.containerSlots = b.build();
}
/**
* Gets all items to be added to the inventory in this drag.
*
* @return map from raw slot id to new ItemStack
*/
public Map<Integer, ItemStack> getNewItems() {
return Collections.unmodifiableMap(addedItems);
}
/**
* Gets the raw slot ids to be changed in this drag.
*
* @return list of raw slot ids, suitable for getView().getItem(int)
*/
public Set<Integer> getRawSlots() {
return addedItems.keySet();
}
/**
* Gets the slots to be changed in this drag.
*
* @return list of converted slot ids, suitable for {@link
* org.bukkit.inventory.Inventory#getItem(int)}.
*/
public Set<Integer> getInventorySlots() {
return containerSlots;
}
/**
* Gets the result cursor after the drag is done. The returned value is
* mutable.
*
* @return the result cursor
*/
public ItemStack getCursor() {
return newCursor;
}
/**
* Sets the result cursor after the drag is done.
* <p>
* Changing this item stack changes the cursor item. Note that changing
* the affected "dragged" slots does not change this ItemStack, nor does
* changing this ItemStack affect the "dragged" slots.
*
* @param newCursor the new cursor ItemStack
*/
public void setCursor(ItemStack newCursor) {
this.newCursor = newCursor;
}
/**
* Gets an ItemStack representing the cursor prior to any modifications
* as a result of this drag.
*
* @return the original cursor
*/
public ItemStack getOldCursor() {
return oldCursor.clone();
}
/**
* Gets the DragType that describes the behavior of ItemStacks placed
* after this InventoryDragEvent.
* <p>
* The ItemStacks and the raw slots that they're being applied to can be
* found using {@link #getNewItems()}.
*
* @return the DragType of this InventoryDragEvent
*/
public DragType getType() {
return type;
}
@Override
public HandlerList getHandlers() {
return handlers;
}
public static HandlerList getHandlerList() {
return handlers;
}
}
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