collection-crud/web/js/vendor/what-input.js
2017-11-09 11:53:01 -05:00

361 lines
9.8 KiB
JavaScript

/**
* 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
});
}
};
}();
/***/ })
/******/ ])
});
;