mirror of
https://github.com/pulsar-edit/pulsar.git
synced 2024-09-11 11:15:24 +03:00
70 lines
2.3 KiB
JavaScript
70 lines
2.3 KiB
JavaScript
function mockDebounce(func, wait, immediate) {
|
|
// This is nearly a copy paste implementation of Underscore's Debounce Function
|
|
// The only reason this is being mocked is because the older implementation being used within
|
|
// underscore-plus has a debounce that checks Date().getTime(), whereas the more recent version
|
|
// and whats expected of the other mock's is Date.now
|
|
// Meaning debounce is able to rely on system time, while the tests manipulate
|
|
// the `window` time to test features that need time to pass between them.
|
|
|
|
var timeout, previous, args, result, context;
|
|
|
|
// Declaring Rest Arguments here, since its included elsewhere in underscore
|
|
var restArguments = function(func, startIndex) {
|
|
startIndex = startIndex == null ? func.length - 1 : +startIndex;
|
|
return function() {
|
|
var length = Math.max(arguments.length = startIndex, 0),
|
|
rest = Array(length),
|
|
index = 0;
|
|
for (; index < length; index++) {
|
|
rest[index] = arguments[index + startIndex];
|
|
}
|
|
switch (startIndex) {
|
|
case 0: return func.call(this, rest);
|
|
case 1: return func.call(this, arguments[0], rest);
|
|
case 2: return func.call(this, arguments[0], arguments[1], rest);
|
|
}
|
|
var args = Array(startIndex + 1);
|
|
for (index = 0; index < startIndex; index++) {
|
|
args[index] = arguments[index];
|
|
}
|
|
args[startIndex] = rest;
|
|
return func.apply(this, args);
|
|
};
|
|
};
|
|
|
|
// now this is whats from the original debounce
|
|
var later = function() {
|
|
// The original Debounce uses its own now.js function here, whereas we can use Date.now()
|
|
var passed = Date.now() - previous;
|
|
if (wait > passed) {
|
|
timeout = setTimeout(later, wait - passed);
|
|
} else {
|
|
timeout = null;
|
|
if (!immediate) result = func.apply(context, args);
|
|
if (!timeout) args = context = null;
|
|
}
|
|
};
|
|
|
|
var debounced = restArguments(function(_args) {
|
|
context = this;
|
|
args = _args;
|
|
previous = Date.now();
|
|
if (!timeout) {
|
|
timeout = setTimeout(later, wait);
|
|
if (immediate) result = func.apply(context, args);
|
|
}
|
|
return result;
|
|
});
|
|
|
|
debounced.cancel = function() {
|
|
clearTimeout(timeout);
|
|
timeout = args = context = null;
|
|
};
|
|
|
|
return debounced;
|
|
}
|
|
|
|
module.exports = {
|
|
mockDebounce,
|
|
};
|