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index.js
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index.js
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// Guard against document not being defined in non-browser environments.
if (typeof global.document === 'undefined') {
module.exports = function (){};
return;
}
// for compression
var win = global.window;
var doc = global.document;
var root = doc.documentElement || {};
// detect if we need to use firefox KeyEvents vs KeyboardEvents
var use_key_event = true;
try {
doc.createEvent('KeyEvents');
}
catch (err) {
use_key_event = false;
}
// Workaround for https://bugs.webkit.org/show_bug.cgi?id=16735
function check_kb(ev, opts) {
if (ev.ctrlKey != (opts.ctrlKey || false) ||
ev.altKey != (opts.altKey || false) ||
ev.shiftKey != (opts.shiftKey || false) ||
ev.metaKey != (opts.metaKey || false) ||
ev.keyCode != (opts.keyCode || 0) ||
ev.charCode != (opts.charCode || 0)) {
ev = document.createEvent('Event');
ev.initEvent(opts.type, opts.bubbles, opts.cancelable);
ev.ctrlKey = opts.ctrlKey || false;
ev.altKey = opts.altKey || false;
ev.shiftKey = opts.shiftKey || false;
ev.metaKey = opts.metaKey || false;
ev.keyCode = opts.keyCode || 0;
ev.charCode = opts.charCode || 0;
}
return ev;
}
// modern browsers, do a proper dispatchEvent()
var modern = function(type, opts) {
opts = opts || {};
// which init fn do we use
var family = typeOf(type);
var init_fam = family;
if (family === 'KeyboardEvent' && use_key_event) {
family = 'KeyEvents';
init_fam = 'KeyEvent';
}
var ev = doc.createEvent(family);
var init_fn = 'init' + init_fam;
var init = typeof ev[init_fn] === 'function' ? init_fn : 'initEvent';
var sig = initSignatures[init];
var args = [];
var used = {};
opts.type = type;
for (var i = 0; i < sig.length; ++i) {
var key = sig[i];
var val = opts[key];
// if no user specified value, then use event default
if (val === undefined) {
val = ev[key];
}
used[key] = true;
args.push(val);
}
ev[init].apply(ev, args);
// webkit key event issue workaround
if (family === 'KeyboardEvent') {
ev = check_kb(ev, opts);
}
// attach remaining unused options to the object
for (var key in opts) {
if (!used[key]) {
ev[key] = opts[key];
}
}
return ev;
};
var legacy = function (type, opts) {
opts = opts || {};
var ev = doc.createEventObject();
ev.type = type;
for (var key in opts) {
if (opts[key] !== undefined) {
ev[key] = opts[key];
}
}
return ev;
};
// expose either the modern version of event generation or legacy
// depending on what we support
// avoids if statements in the code later
module.exports = doc.createEvent ? modern : legacy;
var initSignatures = require('./init.json');
var types = require('./types.json');
var typeOf = (function () {
var typs = {};
for (var key in types) {
var ts = types[key];
for (var i = 0; i < ts.length; i++) {
typs[ts[i]] = key;
}
}
return function (name) {
return typs[name] || 'Event';
};
})();