pointer-lock

pointer lock polyfill that presents an eventemitter / stream api

npm install pointer-lock
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pointer-lock

pointer-lock api exposed as an event emitter that emits readable streams of mouse movement data. automatically handles adding appropriate mousedown/up event listeners on the targeted element. tries to reuse objects instead of creating new objects, to keep garbage generation low. may sing you songs, if you're nice enough to it.

var lock = require('pointer-lock')
  , my_element = document.getElementById('element')

if(!lock.available())
  return alert('not available!')

// my_element can be any element currently attached to
// the document -- but not the document itself (document.body on down
// is fine.)
var pointer = lock(my_element)

pointer.on('attain', function(movements) {
  var initial = {x: movements.x, y: movements: y}

  // movements is a readable stream
  movements.on('data', function(move) {
    // be sure to copy the data *out of* move,
    // as the move object is reused.
    initial.x += move.dx
    initial.y += move.dy
    initial.t += move.dt
  })

  movements.on('close', function() {
    // no more movements from this pointer-lock session.
  })
})

pointer.on('release', function() {
  // pointer has been released
})

pointer.on('error', function() {
  // user denied pointer lock OR it's not available
})

pointer.on('needs-fullscreen', function() {
  // some browsers require you to be in fullscreen mode
  // for pointer lock.
  // this lets you catch that case and request it after
  // you've requested fullscreen.
  var fullscreen = require('fullscreen')
    , fs = fullscreen(my_element)

  fs.once('attain', function() {
    // manually re-request pointer lock
    pointer.request()
  })

  // request fullscreen!
  fs.request()
})

// request pointer lock: warning, may require being called from a mouse event listener
pointer.request()

// releases the pointer lock session, if any.
pointer.release()

// current pointer lock element, if any.
pointer.target()

// remove the mouse event listeners added by lock
pointer.destroy()

license

MIT

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