vscroll/dist/esm5/processes/adapter/check.js

Virtual scroll engine

import { __extends } from "tslib";
import { BaseAdapterProcessFactory, AdapterProcess, ProcessStatus } from '../misc/index';
import { Direction } from '../../inputs/index';
var Check = /** @class */ (function (_super) {
  __extends(Check, _super);
  function Check() {
    return _super !== null && _super.apply(this, arguments) || this;
  }
  Check.run = function (scroller) {
    var workflow = scroller.workflow, buffer = scroller.buffer, fetch = scroller.state.fetch, viewport = scroller.viewport;
    var min = Infinity, max = -Infinity;
    buffer.items.forEach(function (item) {
      var size = item.size;
      item.setSize();
      if (item.size !== size) {
        buffer.cacheItem(item);
        min = Math.min(min, item.$index);
        max = Math.max(max, item.$index);
      }
    });
    if (Number.isFinite(min)) {
      fetch.first.indexBuffer = buffer.firstIndex;
      fetch.last.indexBuffer = buffer.lastIndex;
      var _a = viewport.getEdgeVisibleItem(buffer.items, Direction.backward), firstIndex = _a.index, diff = _a.diff;
      fetch.firstVisible.index = firstIndex;
      if (!isNaN(firstIndex)) {
        fetch.firstVisible.delta = -buffer.getSizeByIndex(firstIndex) + diff;
      }
      fetch.check(buffer.items.filter(function (item) { return item.$index >= min && item.$index <= max; }));
    }
    scroller.logger.stat('check');
    workflow.call({
      process: Check.process,
      status: Number.isFinite(min) ? ProcessStatus.next : ProcessStatus.done
    });
  };
  return Check;
}(BaseAdapterProcessFactory(AdapterProcess.check)));
export default Check;
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