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

Virtual scroll engine

import { __extends, __read, __spreadArray } from "tslib";
import Insert from './insert';
import { BaseAdapterProcessFactory, AdapterProcess, ProcessStatus } from '../misc/index';
var Append = /** @class */ (function (_super) {
  __extends(Append, _super);
  function Append() {
    return _super !== null && _super.apply(this, arguments) || this;
  }
  Append.run = function (scroller, _a) {
    var process = _a.process, options = _a.options;
    var params = Append.parseInput(scroller, options, false, process).params;
    if (!params) {
      return;
    }
    var shouldAppend = Append.doAppend(scroller, process, params);
    scroller.workflow.call({
      process: Append.process,
      status: shouldAppend ? ProcessStatus.next : ProcessStatus.done
    });
  };
  Append.doAppend = function (scroller, process, params) {
    var bof = params.bof, eof = params.eof, increase = params.increase, decrease = params.decrease;
    var buffer = scroller.buffer;
    var prepend = process === AdapterProcess.prepend;
    var opposite = prepend ? !increase : decrease;
    var beforeIndex, afterIndex, items = params.items;
    if (prepend) {
      beforeIndex = (bof ? buffer.absMinIndex : buffer.minIndex) + (!buffer.size ? 1 : 0);
      items = __spreadArray([], __read(items), false).reverse();
    }
    else {
      afterIndex = (eof ? buffer.absMaxIndex : buffer.maxIndex) - (!buffer.size && !opposite ? 1 : 0);
    }
    return Insert.doInsert(scroller, {
      items: items,
      beforeIndex: beforeIndex,
      afterIndex: afterIndex,
      decrease: opposite,
      virtualize: params.virtualize
    });
  };
  return Append;
}(BaseAdapterProcessFactory(AdapterProcess.append)));
export default Append;
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