vscroll/dist/esm2015/processes/adapter/append.js

Virtual scroll engine

import Insert from './insert';
import { BaseAdapterProcessFactory, AdapterProcess, ProcessStatus } from '../misc/index';
export default class Append extends BaseAdapterProcessFactory(AdapterProcess.append) {
  static run(scroller, { process, options }) {
    const { params } = Append.parseInput(scroller, options, false, process);
    if (!params) {
      return;
    }
    const shouldAppend = Append.doAppend(scroller, process, params);
    scroller.workflow.call({
      process: Append.process,
      status: shouldAppend ? ProcessStatus.next : ProcessStatus.done
    });
  }
  static doAppend(scroller, process, params) {
    const { bof, eof, increase, decrease } = params;
    const { buffer } = scroller;
    const prepend = process === AdapterProcess.prepend;
    const opposite = prepend ? !increase : decrease;
    let beforeIndex, afterIndex, items = params.items;
    if (prepend) {
      beforeIndex = (bof ? buffer.absMinIndex : buffer.minIndex) + (!buffer.size ? 1 : 0);
      items = [...items].reverse();
    }
    else {
      afterIndex =
        (eof ? buffer.absMaxIndex : buffer.maxIndex) - (!buffer.size && !opposite ? 1 : 0);
    }
    return Insert.doInsert(scroller, {
      items,
      beforeIndex,
      afterIndex,
      decrease: opposite,
      virtualize: params.virtualize
    });
  }
}
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