export function arrayContentDidChange(array, startIdx, removeAmt, addAmt) {
// if no args are passed assume everything changes
if (startIdx === undefined) {
startIdx = 0;
removeAmt = addAmt = -1;
} else {
if (removeAmt === undefined) {
removeAmt = -1;
}
if (addAmt === undefined) {
addAmt = -1;
}
}
let adding;
if (startIdx >= 0 && addAmt >= 0 && get(array, 'hasEnumerableObservers')) {
adding = [];
let lim = startIdx + addAmt;
for (let idx = startIdx; idx < lim; idx++) {
adding.push(objectAt(array, idx));
}
} else {
adding = addAmt;
}
array.enumerableContentDidChange(removeAmt, adding);
if (array.__each) {
array.__each.arrayDidChange(array, startIdx, removeAmt, addAmt);
}
sendEvent(array, '@array:change', [array, startIdx, removeAmt, addAmt]);
let meta = peekMeta(array);
let cache = meta && meta.readableCache();
if (cache) {
if (cache.firstObject !== undefined &&
objectAt(array, 0) !== cacheFor.get(cache, 'firstObject')) {
propertyWillChange(array, 'firstObject', meta);
propertyDidChange(array, 'firstObject', meta);
}
if (cache.lastObject !== undefined &&
objectAt(array, get(array, 'length') - 1) !== cacheFor.get(cache, 'lastObject')) {
propertyWillChange(array, 'lastObject', meta);
propertyDidChange(array, 'lastObject', meta);
}
}
return array;
}
export function arrayContentDidChange(array, startIdx, removeAmt, addAmt) {
// if no args are passed assume everything changes
if (startIdx === undefined) {
startIdx = 0;
removeAmt = addAmt = -1;
} else {
if (removeAmt === undefined) {
removeAmt = -1;
}
if (addAmt === undefined) {
addAmt = -1;
}
}
let adding;
if (startIdx >= 0 && addAmt >= 0 && get(array, 'hasEnumerableObservers')) {
adding = [];
let lim = startIdx + addAmt;
for (let idx = startIdx; idx < lim; idx++) {
adding.push(objectAt(array, idx));
}
} else {
adding = addAmt;
}
array.enumerableContentDidChange(removeAmt, adding);
if (array.__each) {
array.__each.arrayDidChange(array, startIdx, removeAmt, addAmt);
}
sendEvent(array, '@array:change', [array, startIdx, removeAmt, addAmt]);
let meta = peekMeta(array);
let cache = meta && meta.readableCache();
if (cache !== undefined) {
let length = get(array, 'length');
let addedAmount = (addAmt === -1 ? 0 : addAmt);
let removedAmount = (removeAmt === -1 ? 0 : removeAmt);
let delta = addedAmount - removedAmount;
let previousLength = length - delta;
let normalStartIdx = startIdx < 0 ? previousLength + startIdx : startIdx;
if (cache.firstObject !== undefined && normalStartIdx === 0) {
propertyWillChange(array, 'firstObject');
propertyDidChange(array, 'firstObject');
}
if (cache.lastObject !== undefined) {
let previousLastIndex = previousLength - 1;
let lastAffectedIndex = normalStartIdx + removedAmount;
if (previousLastIndex < lastAffectedIndex) {
propertyWillChange(array, 'lastObject');
propertyDidChange(array, 'lastObject');
}
}
}
return array;
}
