/**
* what-input - A global utility for tracking the current input method (mouse, keyboard or touch). * @version v4.0.6 * @link https://github.com/ten1seven/what-input * @license MIT */
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module.exports = (function() { /* --------------- Variables --------------- */ // cache document.documentElement var docElem = document.documentElement; // last used input type var currentInput = 'initial'; // last used input intent var currentIntent = null; // form input types var formInputs = [ 'input', 'select', 'textarea' ]; // 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 ]; // mapping of events to input types var inputMap = { 'keyup': '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 timer is running var isBuffering = false; // map of IE 10 pointer events var pointerMap = { 2: 'touch', 3: 'touch', // treat pen like touch 4: 'mouse' }; // touch buffer timer var touchTimer = null; /* --------------- Set up --------------- */ var setUp = function() { // add correct mouse wheel event mapping to `inputMap` inputMap[detectWheel()] = 'mouse'; addListeners(); setInput(); }; /* --------------- Events --------------- */ var addListeners = function() { // `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) { docElem.addEventListener('pointerdown', updateInput); docElem.addEventListener('pointermove', setIntent); } else if (window.MSPointerEvent) { docElem.addEventListener('MSPointerDown', updateInput); docElem.addEventListener('MSPointerMove', setIntent); } else { // mouse events docElem.addEventListener('mousedown', updateInput); docElem.addEventListener('mousemove', setIntent); // touch events if ('ontouchstart' in window) { docElem.addEventListener('touchstart', touchBuffer); } } // mouse wheel docElem.addEventListener(detectWheel(), setIntent); // keyboard events docElem.addEventListener('keydown', updateInput); docElem.addEventListener('keyup', updateInput); }; // checks conditions before updating new input var updateInput = function(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 = ( activeElem && activeElem.nodeName && formInputs.indexOf(activeElem.nodeName.toLowerCase()) === -1 ) ? true : false; if ( value === 'touch' || // ignore mouse modifier keys (value === 'mouse' && ignoreMap.indexOf(eventKey) === -1) || // don't switch if the current element is a form input (value === 'keyboard' && activeInput) ) { // set the current and catch-all variable currentInput = currentIntent = value; setInput(); } } } }; // updates the doc and `inputTypes` array with new input var setInput = function() { docElem.setAttribute('data-whatinput', currentInput); docElem.setAttribute('data-whatintent', currentInput); if (inputTypes.indexOf(currentInput) === -1) { inputTypes.push(currentInput); docElem.className += ' whatinput-types-' + currentInput; } }; // updates input intent for `mousemove` and `pointermove` var setIntent = function(event) { // only execute if the touch buffer timer isn't running if (!isBuffering) { var value = inputMap[event.type]; if (value === 'pointer') value = pointerType(event); if (currentIntent !== value) { currentIntent = value; docElem.setAttribute('data-whatintent', currentIntent); } } }; // buffers touch events because they frequently also fire mouse events var touchBuffer = function(event) { // clear the timer if it happens to be running window.clearTimeout(touchTimer); // set the current input updateInput(event); // set the isBuffering to `true` isBuffering = true; // run the timer touchTimer = window.setTimeout(function() { // if the timer runs out, set isBuffering back to `false` isBuffering = false; }, 200); }; /* --------------- Utilities --------------- */ var pointerType = function(event) { if (typeof event.pointerType === 'number') { return pointerMap[event.pointerType]; } else { return (event.pointerType === 'pen') ? 'touch' : event.pointerType; // treat pen like touch } }; // detect version of mouse wheel event to use // via https://developer.mozilla.org/en-US/docs/Web/Events/wheel var detectWheel = function() { return 'onwheel' in document.createElement('div') ? 'wheel' : // Modern browsers support "wheel" document.onmousewheel !== undefined ? 'mousewheel' : // Webkit and IE support at least "mousewheel" 'DOMMouseScroll'; // let's assume that remaining browsers are older Firefox }; /* --------------- 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(opt) { return (opt === 'loose') ? currentIntent : currentInput; }, // returns array: all the detected input types types: function() { return inputTypes; } }; }());
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