protected static List<Entry<ItemStack, Integer>> getChangesClick(InventoryClickEvent event) {
// Create
List<Entry<ItemStack, Integer>> ret = new MassiveList<>();
// Fill
final InventoryAlter alter = InventoryUtil.getAlter(event);
final InventoryAction action = event.getAction();
ItemStack item;
int amount;
// Give
if (alter.isGiving()) {
// Special > MOVE_TO_OTHER_INVENTORY
if (action == InventoryAction.MOVE_TO_OTHER_INVENTORY) {
item = event.getCurrentItem();
ItemStack compare = item.clone();
compare.setAmount(1);
amount = InventoryUtil.roomLeft(event.getInventory(), compare, item.getAmount());
}
// Special > HOTBAR_SWAP
else if (action == InventoryAction.HOTBAR_SWAP) {
item = event.getView().getBottomInventory().getItem(event.getHotbarButton());
amount = item.getAmount();
}
// Normal
else {
item = event.getCursor();
amount = item.getAmount();
if (action == InventoryAction.PLACE_ONE) {
amount = 1;
} else if (action == InventoryAction.PLACE_SOME) {
int max = event.getCurrentItem().getType().getMaxStackSize();
amount = max - event.getCurrentItem().getAmount();
}
}
amount *= -1;
ret.add(new SimpleEntry<ItemStack, Integer>(item, amount));
}
// Take
if (alter.isTaking()) {
item = event.getCurrentItem();
amount = item.getAmount();
if (action == InventoryAction.PICKUP_ONE) amount = 1;
if (action == InventoryAction.PICKUP_HALF) amount = (int) Math.ceil(amount / 2.0);
ret.add(new SimpleEntry<ItemStack, Integer>(item, amount));
}
// Return
return ret;
}
// Drag events by nature only matters when they affect the top inventory.
// What you are holding in the cursor is already yours.
// If you drag it into your own inventory you are not really taking anything.
// If you drag into the top inventory however, you may both give and take.
// You "take" by dragging over an existing item (since we don't do any math).
protected static List<Entry<ItemStack, Integer>> getChangesDrag(InventoryDragEvent event) {
// Create
List<Entry<ItemStack, Integer>> ret = new MassiveList<>();
// Fill
final Inventory inventory = event.getInventory();
for (Entry<Integer, ItemStack> entry : event.getNewItems().entrySet()) {
int rawSlot = entry.getKey();
if (InventoryUtil.isBottomInventory(rawSlot, inventory)) continue;
ItemStack take = inventory.getItem(rawSlot);
if (isSomething(take)) ret.add(new SimpleEntry<ItemStack, Integer>(take, +take.getAmount()));
ItemStack give = entry.getValue();
if (isSomething(give)) ret.add(new SimpleEntry<ItemStack, Integer>(give, -give.getAmount()));
}
// Return
return ret;
}
