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import { scheduler, updateCount } from './utils/scheduler';
import { ResizeObservation } from './ResizeObservation';
import { ResizeObserverDetail } from './ResizeObserverDetail';
import { resizeObservers } from './utils/resizeObservers';
var observerMap = new WeakMap();
var getObservationIndex = function (observationTargets, target) {
for (var i = 0; i < observationTargets.length; i += 1) {
if (observationTargets[i].target === target) {
return i;
}
}
return -1;
};
var ResizeObserverController = (function () {
function ResizeObserverController() {
}
ResizeObserverController.connect = function (resizeObserver, callback) {
var detail = new ResizeObserverDetail(resizeObserver, callback);
observerMap.set(resizeObserver, detail);
};
ResizeObserverController.observe = function (resizeObserver, target, options) {
var detail = observerMap.get(resizeObserver);
var firstObservation = detail.observationTargets.length === 0;
if (getObservationIndex(detail.observationTargets, target) < 0) {
firstObservation && resizeObservers.push(detail);
detail.observationTargets.push(new ResizeObservation(target, options && options.box));
updateCount(1);
scheduler.schedule();
}
};
ResizeObserverController.unobserve = function (resizeObserver, target) {
var detail = observerMap.get(resizeObserver);
var index = getObservationIndex(detail.observationTargets, target);
var lastObservation = detail.observationTargets.length === 1;
if (index >= 0) {
lastObservation && resizeObservers.splice(resizeObservers.indexOf(detail), 1);
detail.observationTargets.splice(index, 1);
updateCount(-1);
}
};
ResizeObserverController.disconnect = function (resizeObserver) {
var _this = this;
var detail = observerMap.get(resizeObserver);
detail.observationTargets.slice().forEach(function (ot) { return _this.unobserve(resizeObserver, ot.target); });
detail.activeTargets.splice(0, detail.activeTargets.length);
};
return ResizeObserverController;
}());
export { ResizeObserverController };
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