"use strict";
var immutable_class_1 = require('immutable-class');
var general_1 = require('../../utils/general/general');
var check;
var DragPosition = (function () {
function DragPosition(parameters) {
this.insert = general_1.hasOwnProperty(parameters, 'insert') ? parameters.insert : null;
this.replace = general_1.hasOwnProperty(parameters, 'replace') ? parameters.replace : null;
Iif (this.insert == null && this.replace == null)
throw new Error('invalid drag position');
}
DragPosition.isDragPosition = function (candidate) {
return immutable_class_1.isInstanceOf(candidate, DragPosition);
};
DragPosition.calculateFromOffset = function (offset, numItems, itemWidth, itemGap) {
if (!numItems) {
return new DragPosition({
replace: 0
});
}
if (offset < 0) {
return new DragPosition({
insert: 0
});
}
var sectionWidth = itemWidth + itemGap;
var sectionNumber = Math.floor(offset / sectionWidth);
if (numItems <= sectionNumber) {
return new DragPosition({
replace: numItems
});
}
var offsetWithinSection = offset - sectionWidth * sectionNumber;
if (offsetWithinSection < itemWidth) {
return new DragPosition({
replace: sectionNumber
});
}
else {
return new DragPosition({
insert: sectionNumber + 1
});
}
};
DragPosition.fromJS = function (parameters) {
return new DragPosition(parameters);
};
DragPosition.prototype.valueOf = function () {
return {
insert: this.insert,
replace: this.replace
};
};
DragPosition.prototype.toJS = function () {
var js = {};
if (this.insert != null)
js.insert = this.insert;
if (this.replace != null)
js.replace = this.replace;
return js;
};
DragPosition.prototype.toJSON = function () {
return this.toJS();
};
DragPosition.prototype.toString = function () {
if (this.insert != null) {
return "[insert " + this.insert + "]";
}
else {
return "[replace " + this.replace + "]";
}
};
DragPosition.prototype.equals = function (other) {
return DragPosition.isDragPosition(other) &&
this.insert === other.insert &&
this.replace === other.replace;
};
DragPosition.prototype.isInsert = function () {
return this.insert !== null;
};
DragPosition.prototype.isReplace = function () {
return this.replace !== null;
};
return DragPosition;
}());
exports.DragPosition = DragPosition;
check = DragPosition;
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