what-input.js

/**
 * what-input - A global utility for tracking the current input method (mouse, keyboard or touch).
 * @version v4.2.0
 * @link https://github.com/ten1seven/what-input
 * @license MIT
 */
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		exports["whatInput"] = factory();
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		root["whatInput"] = factory();
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/* 0 */
/***/ (function(module, exports) {

	'use strict';

	module.exports = function () {
	  /*
	   * variables
	   */

	  // last used input type
	  var currentInput = 'initial';

	  // last used input intent
	  var currentIntent = null;

	  // cache document.documentElement
	  var doc = document.documentElement;

	  // form input types
	  var formInputs = ['input', 'select', 'textarea'];

	  var functionList = [];

	  // list of modifier keys commonly used with the mouse and
	  // can be safely ignored to prevent false keyboard detection
	  var ignoreMap = [16, // shift
	  17, // control
	  18, // alt
	  91, // Windows key / left Apple cmd
	  93 // Windows menu / right Apple cmd
	  ];

	  // list of keys for which we change intent even for form inputs
	  var changeIntentMap = [9 // tab
	  ];

	  // mapping of events to input types
	  var inputMap = {
	    keydown: 'keyboard',
	    mousedown: 'mouse',
	    mousemove: 'mouse',
	    MSPointerDown: 'pointer',
	    MSPointerMove: 'pointer',
	    pointerdown: 'pointer',
	    pointermove: 'pointer',
	    touchstart: 'touch'
	  };

	  // array of all used input types
	  var inputTypes = [];

	  // boolean: true if touch buffer is active
	  var isBuffering = false;

	  // boolean: true if the page is being scrolled
	  var isScrolling = false;

	  // store current mouse position
	  var mousePos = {
	    x: null,
	    y: null
	  };

	  // map of IE 10 pointer events
	  var pointerMap = {
	    2: 'touch',
	    3: 'touch', // treat pen like touch
	    4: 'mouse'
	  };

	  var supportsPassive = false;

	  try {
	    var opts = Object.defineProperty({}, 'passive', {
	      get: function get() {
	        supportsPassive = true;
	      }
	    });

	    window.addEventListener('test', null, opts);
	  } catch (e) {}

	  /*
	   * set up
	   */

	  var setUp = function setUp() {
	    // add correct mouse wheel event mapping to `inputMap`
	    inputMap[detectWheel()] = 'mouse';

	    addListeners();
	    setInput();
	  };

	  /*
	   * events
	   */

	  var addListeners = function addListeners() {
	    // `pointermove`, `MSPointerMove`, `mousemove` and mouse wheel event binding
	    // can only demonstrate potential, but not actual, interaction
	    // and are treated separately

	    // pointer events (mouse, pen, touch)
	    if (window.PointerEvent) {
	      doc.addEventListener('pointerdown', updateInput);
	      doc.addEventListener('pointermove', setIntent);
	    } else if (window.MSPointerEvent) {
	      doc.addEventListener('MSPointerDown', updateInput);
	      doc.addEventListener('MSPointerMove', setIntent);
	    } else {
	      // mouse events
	      doc.addEventListener('mousedown', updateInput);
	      doc.addEventListener('mousemove', setIntent);

	      // touch events
	      if ('ontouchstart' in window) {
	        doc.addEventListener('touchstart', touchBuffer);
	        doc.addEventListener('touchend', touchBuffer);
	      }
	    }

	    // mouse wheel
	    doc.addEventListener(detectWheel(), setIntent, supportsPassive ? { passive: true } : false);

	    // keyboard events
	    doc.addEventListener('keydown', updateInput);
	  };

	  // checks conditions before updating new input
	  var updateInput = function updateInput(event) {
	    // only execute if the touch buffer timer isn't running
	    if (!isBuffering) {
	      var eventKey = event.which;
	      var value = inputMap[event.type];
	      if (value === 'pointer') value = pointerType(event);

	      if (currentInput !== value || currentIntent !== value) {
	        var activeElem = document.activeElement;
	        var activeInput = false;
	        var notFormInput = activeElem && activeElem.nodeName && formInputs.indexOf(activeElem.nodeName.toLowerCase()) === -1;

	        if (notFormInput || changeIntentMap.indexOf(eventKey) !== -1) {
	          activeInput = true;
	        }

	        if (value === 'touch' ||
	        // ignore mouse modifier keys
	        value === 'mouse' ||
	        // don't switch if the current element is a form input
	        value === 'keyboard' && eventKey && activeInput && ignoreMap.indexOf(eventKey) === -1) {
	          // set the current and catch-all variable
	          currentInput = currentIntent = value;

	          setInput();
	        }
	      }
	    }
	  };

	  // updates the doc and `inputTypes` array with new input
	  var setInput = function setInput() {
	    doc.setAttribute('data-whatinput', currentInput);
	    doc.setAttribute('data-whatintent', currentInput);

	    if (inputTypes.indexOf(currentInput) === -1) {
	      inputTypes.push(currentInput);
	      doc.className += ' whatinput-types-' + currentInput;
	    }

	    fireFunctions('input');
	  };

	  // updates input intent for `mousemove` and `pointermove`
	  var setIntent = function setIntent(event) {
	    // test to see if `mousemove` happened relative to the screen
	    // to detect scrolling versus mousemove
	    if (mousePos['x'] !== event.screenX || mousePos['y'] !== event.screenY) {
	      isScrolling = false;

	      mousePos['x'] = event.screenX;
	      mousePos['y'] = event.screenY;
	    } else {
	      isScrolling = true;
	    }

	    // only execute if the touch buffer timer isn't running
	    // or scrolling isn't happening
	    if (!isBuffering && !isScrolling) {
	      var value = inputMap[event.type];
	      if (value === 'pointer') value = pointerType(event);

	      if (currentIntent !== value) {
	        currentIntent = value;

	        doc.setAttribute('data-whatintent', currentIntent);

	        fireFunctions('intent');
	      }
	    }
	  };

	  // buffers touch events because they frequently also fire mouse events
	  var touchBuffer = function touchBuffer(event) {
	    if (event.type === 'touchstart') {
	      isBuffering = false;

	      // set the current input
	      updateInput(event);
	    } else {
	      isBuffering = true;
	    }
	  };

	  var fireFunctions = function fireFunctions(type) {
	    for (var i = 0, len = functionList.length; i < len; i++) {
	      if (functionList[i].type === type) {
	        functionList[i].function.call(undefined, currentIntent);
	      }
	    }
	  };

	  /*
	   * utilities
	   */

	  var pointerType = function pointerType(event) {
	    if (typeof event.pointerType === 'number') {
	      return pointerMap[event.pointerType];
	    } else {
	      // treat pen like touch
	      return event.pointerType === 'pen' ? 'touch' : event.pointerType;
	    }
	  };

	  // detect version of mouse wheel event to use
	  // via https://developer.mozilla.org/en-US/docs/Web/Events/wheel
	  var detectWheel = function detectWheel() {
	    var wheelType = void 0;

	    // Modern browsers support "wheel"
	    if ('onwheel' in document.createElement('div')) {
	      wheelType = 'wheel';
	    } else {
	      // Webkit and IE support at least "mousewheel"
	      // or assume that remaining browsers are older Firefox
	      wheelType = document.onmousewheel !== undefined ? 'mousewheel' : 'DOMMouseScroll';
	    }

	    return wheelType;
	  };

	  /*
	   * init
	   */

	  // don't start script unless browser cuts the mustard
	  // (also passes if polyfills are used)
	  if ('addEventListener' in window && Array.prototype.indexOf) {
	    setUp();
	  }

	  /*
	   * api
	   */

	  return {
	    // returns string: the current input type
	    // opt: 'loose'|'strict'
	    // 'strict' (default): returns the same value as the `data-whatinput` attribute
	    // 'loose': includes `data-whatintent` value if it's more current than `data-whatinput`
	    ask: function ask(opt) {
	      return opt === 'loose' ? currentIntent : currentInput;
	    },

	    // returns array: all the detected input types
	    types: function types() {
	      return inputTypes;
	    },

	    // overwrites ignored keys with provided array
	    ignoreKeys: function ignoreKeys(arr) {
	      ignoreMap = arr;
	    },

	    // attach functions to input and intent "events"
	    // funct: function to fire on change
	    // eventType: 'input'|'intent'
	    onChange: function onChange(funct, eventType) {
	      functionList.push({
	        function: funct,
	        type: eventType
	      });
	    }
	  };
	}();

/***/ })
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});
;