devextreme/esm/ui/tree_list/ui.tree_list.virtual_scrolling.js

HTML5 JavaScript Component Suite for Responsive Web Development

/**
 * DevExtreme (esm/ui/tree_list/ui.tree_list.virtual_scrolling.js)
 * Version: 21.1.4
 * Build date: Mon Jun 21 2021
 *
 * Copyright (c) 2012 - 2021 Developer Express Inc. ALL RIGHTS RESERVED
 * Read about DevExtreme licensing here: https://js.devexpress.com/Licensing/
 */
import gridCore from "./ui.tree_list.core";
import dataSourceAdapter from "./ui.tree_list.data_source_adapter";
import {
    virtualScrollingModule
} from "../grid_core/ui.grid_core.virtual_scrolling";
import {
    extend
} from "../../core/utils/extend";
var oldDefaultOptions = virtualScrollingModule.defaultOptions;
var originalDataControllerExtender = virtualScrollingModule.extenders.controllers.data;
var originalDataSourceAdapterExtender = virtualScrollingModule.extenders.dataSourceAdapter;
virtualScrollingModule.extenders.controllers.data = extend({}, originalDataControllerExtender, {
    _loadOnOptionChange: function() {
        var virtualScrollController = this._dataSource && this._dataSource._virtualScrollController;
        virtualScrollController && virtualScrollController.reset();
        this.callBase()
    }
});
virtualScrollingModule.extenders.dataSourceAdapter = extend({}, originalDataSourceAdapterExtender, {
    changeRowExpand: function() {
        return this.callBase.apply(this, arguments).done(() => {
            var viewportItemIndex = this.getViewportItemIndex();
            viewportItemIndex >= 0 && this.setViewportItemIndex(viewportItemIndex)
        })
    }
});
gridCore.registerModule("virtualScrolling", extend({}, virtualScrollingModule, {
    defaultOptions: function() {
        return extend(true, oldDefaultOptions(), {
            scrolling: {
                mode: "virtual"
            }
        })
    }
}));
dataSourceAdapter.extend(virtualScrollingModule.extenders.dataSourceAdapter);