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

Virtual scroll engine

import Update from './update';
import { BaseAdapterProcessFactory, AdapterProcess, ProcessStatus } from '../misc/index';
export default class Replace extends BaseAdapterProcessFactory(AdapterProcess.replace) {
  static run(scroller, options) {
    const { params } = Replace.parseInput(scroller, options);
    if (!params) {
      return;
    }
    const shouldReplace = Replace.doReplace(scroller, params);
    scroller.workflow.call({
      process: Replace.process,
      status: shouldReplace ? ProcessStatus.next : ProcessStatus.done,
    });
  }
  static doReplace(scroller, params) {
    const toRemove = scroller.buffer.items
      .filter(item => params.predicate(item))
      .map(item => item.$index);
    if (!toRemove.length) {
      scroller.logger.log('no items to be replaced');
      return false;
    }
    let injected = false;
    const updateOptions = {
      predicate: ({ $index }) => {
        if (!toRemove.includes($index)) {
          return true;
        }
        if (!injected) {
          injected = true;
          return params.items;
        }
        return false;
      },
      fixRight: params.fixRight
    };
    return Update.doUpdate(scroller, updateOptions);
  }
}
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