NonfungiblePositionManager

Wraps DragonswapV2 positions in the ERC721 non-fungible token interface

Functions​

constructor​

  function constructor(
  ) public

positions​

  function positions(
    uint256 tokenId
  ) external view returns (uint96 nonce, address operator, address token0, address token1, uint24 fee, int24 tickLower, int24 tickUpper, uint128 liquidity, uint256 feeGrowthInside0LastX128, uint256 feeGrowthInside1LastX128, uint128 tokensOwed0, uint128 tokensOwed1)

Returns the position information associated with a given token ID.

Throws if the token ID is not valid.

Parameters:​

Name	Type	Description
tokenId	uint256	The ID of the token that represents the position

Return Values:​

Name	Type	Description
nonce	uint96	The nonce for permits
operator	address	The address that is approved for spending
token0	address	The address of the token0 for a specific pool
token1	address	The address of the token1 for a specific pool
fee	uint24	The fee associated with the pool
tickLower	int24	The lower end of the tick range for the position
tickUpper	int24	The higher end of the tick range for the position
liquidity	uint128	The liquidity of the position
feeGrowthInside0LastX128	uint256	The fee growth of token0 as of the last action on the individual position
feeGrowthInside1LastX128	uint256	The fee growth of token1 as of the last action on the individual position
tokensOwed0	uint128	The uncollected amount of token0 owed to the position as of the last computation
tokensOwed1	uint128	The uncollected amount of token1 owed to the position as of the last computation

mint​

  function mint(
    struct INonfungiblePositionManager.MintParams params
  ) external returns (uint256 tokenId, uint128 liquidity, uint256 amount0, uint256 amount1)

Creates a new position wrapped in a NFT

Call this when the pool does exist and is initialized. Note that if the pool is created but not initialized a method does not exist, i.e. the pool is assumed to be initialized.

Parameters:​

Name	Type	Description
params	struct INonfungiblePositionManager.MintParams	The params necessary to mint a position, encoded as MintParams in calldata

Return Values:​

Name	Type	Description
tokenId	uint256	The ID of the token that represents the minted position
liquidity	uint128	The amount of liquidity for this position
amount0	uint256	The amount of token0
amount1	uint256	The amount of token1

tokenURI​

  function tokenURI(
    uint256 tokenId
  ) public view returns (string)

Returns a URI describing a particular token ID

Parameters:​

Name	Type	Description
tokenId	uint256	The ID of the token that represents the minted position

Return Values:​

A base64 string with the URI data.

baseURI​

  function baseURI(
  ) public returns (string)

increaseLiquidity​

  function increaseLiquidity(
    struct INonfungiblePositionManager.IncreaseLiquidityParams params
  ) external returns (uint128 liquidity, uint256 amount0, uint256 amount1)

Increases the amount of liquidity in a position, with tokens paid by the msg.sender

Parameters:​

Name	Type	Description
params	struct INonfungiblePositionManager.IncreaseLiquidityParams	tokenId The ID of the token for which liquidity is being increased,

Return Values:​

Name	Type	Description
liquidity	uint128	The new liquidity amount as a result of the increase
amount0	uint256	The amount of token0 to achieve resulting liquidity
amount1	uint256	The amount of token1 to achieve resulting liquidity

decreaseLiquidity​

  function decreaseLiquidity(
    struct INonfungiblePositionManager.DecreaseLiquidityParams params
  ) external returns (uint256 amount0, uint256 amount1)

Decreases the amount of liquidity in a position and accounts it to the position

Parameters:​

Name	Type	Description
params	struct INonfungiblePositionManager.DecreaseLiquidityParams	tokenId The ID of the token for which liquidity is being decreased,

Return Values:​

Name	Type	Description
amount0	uint256	The amount of token0 accounted to the position's tokens owed
amount1	uint256	The amount of token1 accounted to the position's tokens owed

collect​

  function collect(
    struct INonfungiblePositionManager.CollectParams params
  ) external returns (uint256 amount0, uint256 amount1)

Collects up to a maximum amount of fees owed to a specific position to the recipient

Parameters:​

Name	Type	Description
params	struct INonfungiblePositionManager.CollectParams	tokenId The ID of the NFT for which tokens are being collected,

recipient The account that should receive the tokens, amount0Max The maximum amount of token0 to collect, amount1Max The maximum amount of token1 to collect

Return Values:​

Name	Type	Description
amount0	uint256	The amount of fees collected in token0
amount1	uint256	The amount of fees collected in token1

burn​

  function burn(
    uint256 tokenId
  ) external

Burns a token ID, which deletes it from the NFT contract. The token must have 0 liquidity and all tokens must be collected first.

Parameters:​

Name	Type	Description
tokenId	uint256	The ID of the token that is being burned

_getAndIncrementNonce​

  function _getAndIncrementNonce(
  ) internal returns (uint256)

getApproved​

  function getApproved(
  ) public view returns (address)

Returns the account approved for tokenId token. Requirements:

• tokenId must exist.

_approve​

  function _approve(
  ) internal

Overrides _approve to use the operator in the position, which is packed with the position permit nonce