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https://github.com/xiejiangzhi/input

Input for Love2D
https://github.com/xiejiangzhi/input

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Input for Love2D

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README 

        
Input

===========



Simple and powerful input handler for LOVE2D.



## Features



* Support keyboard, mouse, joystick

* Check key is down with delay and interval. And can get duration time.

* Check pressed or released on current frame.

* Check multiple keys down with delay and interval.

* Check sequence keys down with interval limit.

* Get pressed keys.

* Get history of pressed keys.



## Example



```lua

local Input = require 'input'



function love.load()

  Input.bind_callbacks()

end



function love.update(dt)

  local delay, interval = 0.5, 1

  local is_down, _, duration = Input.down('a', delay, interval)

  local is_down, val, duration = Input.down('leftx')

  local is_pressed, data, released_duration = Input.pressed('a')

  local is_released, data, pressed_duration = Input.released('leftx')

  local is_down = Input.multidown({ 'a', 'b' }, delay, interval)

  local min_interval, max_interval = 0, 0.3

  local is_down, data_of_last_key = Input.sequence({ 'a', 'b' }, min_interval, max_interval)



  local keys = iNput.get_down_keys()

  local keys_info = Input.get_history(2)

end

```

Better example please see [here](https://github.com/xiejiangzhi/input/blob/main/main.lua)



## API



### Bind callbacks



Call it to setup input callbacks.



`Input.bind_callbacks()`



### Check key is down



`is_down, data, duration = Input.down(key, delay, interval)`



`delay` and `interval` unit seconds



`data` is the axis value for axis key. nil for normal key

`duration` is the duration time in second.



```lua

-- for normal key

local is_down, data, duration = Input.down('1')

if is_down then assert(data == nil) end



-- for mouse

local is_down, pos, duration = Input.down('mouse1')

if is_down then print(pos.x, pos.y) end



-- for gamepad axis

local is_down, axis_val, duration = Input.down('leftx')

if is_down then assert(type(data) == 'number') end



-- for wheel

local is_down, wheel_val, duration = Input.down('wheelx')

if is_down then assert(type(wheel_val) == 'number') end

```



### Check multiple keys is down



`is_down, data_of_last_key, duration = Input.multidown(keys, delay, interval)`



`delay` and `interval` unit seconds



```

local is_down, mouse_pos, duration = Input.multidown({ 'fdown', 'mouse1' }, 1, 1)

```



### Check a key is pressed on the current frame



`is_pressed, data, released_time = Input.pressed(key)`



`data` is the axis value for axis key. nil for normal key

`released_time` will be nil for first call



### Check a key is released on the current frame



`is_released, data, released_time = Input.released(key)`



`data` is the axis value for axis key. nil for normal key

`released_time` will be nil for first call



### Check keys is down in sequence



`is_pressed, data_of_last_key = Input.sequence(keys, min_interval, max_interval)`



```lua

  -- any interval

  Input.sequence({ 'a', 'b', 'c' })



  -- The interval between two presses must be less than 0.3s and greater than 0.1s

  Input.sequence({ 'a', 'b', 'c' }, 0.1, 0.3)

```



NOTE: Following keys is invalid for sequence, but you can change the set by `Input.sequence_except_keys`



```lua

-- Default value

Input.sequence_except_keys = {

  mousemove = true,

  wheelx = true, wheely = true,

  leftx = true, lefty = true,

  rightx = true, righty = true

}



-- Except sequence keys 'a', 's' 'd' and 'w'

for i, k in ipairs({ 'a', 's', 'd', 'w' }) do

  Input.sequence_except_keys[k] = true

end

```



### Get a relative to time of the last action(pressed or released)



`seconds = Input.duration(key, strict)`



`strict`: Whether to calculate the exact time. Default value is false, duration relative to last frame.



Return nil if the key has never been down



### Get the history of pressed keys. Max history items is 10.



`items = Input.get_history(n)`



`items`: Sort by pressing time from nearest to far.

`item.key`:

`item.interval`: relative to the time of previous key was pressed



### Get all down keys



`keys = Input.get_down_keys`



### Get key data



`data = Input.get_data(key)`



### Manually input event



Call following callbacks, the arguments is the same as Love2D's callbacks



```lua

local Callbacks = {

  'keypressed', 'keyreleased',

  'mousepressed', 'mousereleased', 'mousemoved', 'wheelmoved',

  'gamepadpressed', 'gamepadreleased', 'gamepadaxis'

}

```



Example



```

Input.keypressed('a')

Input.keyreleased('a')

```



## Axis threshold



Release axis key if axis value < threshold, but still can get the current axis value by `Input.get_data`



```

Input.axis_threshold = {

  leftx = 0.1, lefty = 0.1,

  rightx = 0.1, righty = 0.1,

  l2 = 0.1, r2 = 0.1,

}

```



## Multiple gamepad



Set `Input.multiple_gamepad = true`, then all gamepad keys will has a suffix `{key}:{index}`



The first trigger gamepad will get index 1, others will be automatically incremented



```

Input.multiple_gamepad = true

Input.down('fdown:1') -- first gamepad

Input.down('fdown:2') -- seconds gamepad

```

**NOTE**: Now, multiple gamepad keys will push to one list, so `Input.sequence` cannot use specified gamepad index. Maybe it will be fixed later



## Keys



**keyborad** [Key Constant](https://love2d.org/wiki/KeyConstant)



**Mouse**

```

local MouseKeysMapping = {

  move = 'mousemove',

  wheelx = 'wheelx', wheely = 'wheely',

  [1] = 'mouse1', [2] = 'mouse2', [3] = 'mouse3',

  [4] = 'mouse4', [5] = 'mouse5', [6] = 'mouse6',

}

local WheelKeysMapping = {

  x = 'wheelx', y = 'wheely'

}

```



**Gamepad**



```

local GamepadKeysMapping = {

  a = 'fdown', y = 'fup', x = 'fleft', b = 'fright',

  back = 'back', guide = 'guide', start = 'start',

  leftstick = 'leftstick', rightstick = 'rightstick',

  leftshoulder = 'l1', rightshoulder = 'r1',

  dpup = 'dpup', dpdown = 'dpdown', dpleft = 'dpleft', dpright = 'dpright',



  -- axis

  leftx = 'leftx', lefty = 'lefty',

  rightx = 'rightx', righty = 'righty',

  triggerleft = 'l2', triggerright = 'r2'

}

```