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/* Copyright 2020 Esri
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
//------------------------------------------------------------------------------
export const OrderAscending = 0
export const OrderDescending = 1
//------------------------------------------------------------------------------
export function sort(model, sortKey, descending, useMove) {
_sort(model, sortKey, descending, useMove);
}
//------------------------------------------------------------------------------
function _sort(model, sortKey, descending, useMove) {
var lessThan = descending ? 1 : -1;
var greaterThan = -lessThan;
var indices = [...new Array(model.count).keys()];
function getKeyValue(index) {
return model.get(index)[sortKey];
}
function compareKey(index1, index2) {
var value1 = getKeyValue(index1);
var value2 = getKeyValue(index2);
return (value1 < value2)
? lessThan
: (value1 > value2)
? greaterThan
: 0;
}
indices.sort(compareKey);
function compareFrom(i1, i2) {
return (i1.from < i2.from)
? -1
: (i1.from > i2.from)
? 1
: 0;
}
var swapIndices = indices.map((e, i) => { return { from: e, to: i }}).sort(compareFrom).map(e => e.to);
function clone(o) {
return JSON.parse(JSON.stringify(o));
}
function cloneSwap(a, b) {
var o = clone(model.get(a));
model.set(a, model.get(b));
model.set(b, o);
}
function moveSwap(a, b) {
if (a < b) {
model.move(a, b, 1);
model.move(b - 1, a, 1);
}
else if (a > b) {
model.move(b, a, 1);
model.move(a - 1, b, 1);
}
}
var swap = useMove ? moveSwap : cloneSwap;
var swapCount = 0;
for (var iFrom = 0; iFrom < swapIndices.length; iFrom++) {
var iTo = swapIndices[iFrom];
if (iFrom === iTo) {
continue;
}
do {
swap(iFrom, iTo);
var t = swapIndices[iFrom];
swapIndices[iFrom] = swapIndices[iTo]
swapIndices[iTo] = t;
iTo = swapIndices[iFrom];
swapCount++;
}
while (iFrom !== iTo);
}
}
//------------------------------------------------------------------------------
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