/**
         * Left mouse button without shift and not dragging inside the
         * inventory.
         * <p>
         * DEFAULT behavior: If the cursor is air, and there is a item in the
         * clicked slot, the whole itemstack is picked up. If the cursor is
         * air, and there is no item in the clicked slot, this does nothing.
         * If the cursor has an item, and there is no item in the clicked
         * slot, this deposits the whole itemstack. If the cursor has an item,
         * and the same item is in the clicked slot, as much as possible
         * ({@link Inventory#getMaxStackSize()} of the itemstack is deposited.
         * If the cursor and the clicked slot have different items, they are
         * exchanged.
         */
        LEFT,
        /**
         * Shift key plus left mouse button.
         * <p>
         * DEFAULT behavior:
         * <ul>
         * <li>If the player's inventory is open: If the clicked item is a
         * wearable piece of armor, it is equipped. If the clicked slot is
         * not on the player's hotbar, and there is room on the player's
         * hotbar, it is moved to the rightmost slot on the hotbar. If there
         * is no room on the player's hotbar, and the clicked slot is within
         * the player's inventory, this does nothing, excluding the armor
         * behavior mentioned above. If there is no room on the player's
         * hotbar, and the clicked slot is in the player's crafting grid, the
         * clicked item is moved to the first available slot in the player's
         * inventory, starting on the hotbar then starting from the top-left
         * and going across. If the clicked slot is on the hotbar, the item
         * is moved to the first available slot in the player's inventory,
         * starting on the top-left and going across.</li>
         * <li>If the player's inventory is not open: If the clicked item is
         * in the player's inventory, it is moved to the top inventory if
         * possible. If no slots in the top inventory will accept the item,
         * this does nothing. If the clicked item is in the top inventory,
         * the item will be moved to the first slot in the player's
         * inventory, starting with the right side of the hotbar, then
         * starting in the bottom-right of the player's inventory and going
         * across.</li>
         * </ul>
         */
        SHIFT_LEFT,