forked from meissa/ModeratorElection
285 lines
12 KiB
JavaScript
285 lines
12 KiB
JavaScript
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import { Debouncer } from '@polymer/polymer/lib/utils/debounce.js';
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import { timeOut } from '@polymer/polymer/lib/utils/async.js';
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import { ComboBoxPlaceholder } from '@vaadin/combo-box/src/vaadin-combo-box-placeholder.js';
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(function () {
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const tryCatchWrapper = function (callback) {
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return window.Vaadin.Flow.tryCatchWrapper(callback, 'Vaadin Combo Box');
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};
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window.Vaadin.Flow.comboBoxConnector = {
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initLazy: (comboBox) =>
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tryCatchWrapper(function (comboBox) {
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// Check whether the connector was already initialized for the ComboBox
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if (comboBox.$connector) {
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return;
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}
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comboBox.$connector = {};
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// holds pageIndex -> callback pairs of subsequent indexes (current active range)
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const pageCallbacks = {};
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let cache = {};
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let lastFilter = '';
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const placeHolder = new window.Vaadin.ComboBoxPlaceholder();
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const serverFacade = (() => {
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// Private variables
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let lastFilterSentToServer = '';
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let dataCommunicatorResetNeeded = false;
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// Public methods
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const needsDataCommunicatorReset = () => (dataCommunicatorResetNeeded = true);
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const getLastFilterSentToServer = () => lastFilterSentToServer;
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const requestData = (startIndex, endIndex, params) => {
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const count = endIndex - startIndex;
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const filter = params.filter;
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comboBox.$server.setRequestedRange(startIndex, count, filter);
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lastFilterSentToServer = filter;
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if (dataCommunicatorResetNeeded) {
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comboBox.$server.resetDataCommunicator();
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dataCommunicatorResetNeeded = false;
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}
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};
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return {
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needsDataCommunicatorReset,
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getLastFilterSentToServer,
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requestData
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};
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})();
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const clearPageCallbacks = (pages = Object.keys(pageCallbacks)) => {
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// Flush and empty the existing requests
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pages.forEach((page) => {
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pageCallbacks[page]([], comboBox.size);
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delete pageCallbacks[page];
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// Empty the comboBox's internal cache without invoking observers by filling
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// the filteredItems array with placeholders (comboBox will request for data when it
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// encounters a placeholder)
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const pageStart = parseInt(page) * comboBox.pageSize;
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const pageEnd = pageStart + comboBox.pageSize;
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const end = Math.min(pageEnd, comboBox.filteredItems.length);
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for (let i = pageStart; i < end; i++) {
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comboBox.filteredItems[i] = placeHolder;
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}
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});
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};
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comboBox.dataProvider = function (params, callback) {
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if (params.pageSize != comboBox.pageSize) {
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throw 'Invalid pageSize';
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}
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if (comboBox._clientSideFilter) {
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// For clientside filter we first make sure we have all data which we also
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// filter based on comboBox.filter. While later we only filter clientside data.
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if (cache[0]) {
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performClientSideFilter(cache[0], params.filter, callback);
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return;
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} else {
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// If client side filter is enabled then we need to first ask all data
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// and filter it on client side, otherwise next time when user will
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// input another filter, eg. continue to type, the local cache will be only
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// what was received for the first filter, which may not be the whole
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// data from server (keep in mind that client side filter is enabled only
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// when the items count does not exceed one page).
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params.filter = '';
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}
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}
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const filterChanged = params.filter !== lastFilter;
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if (filterChanged) {
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cache = {};
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lastFilter = params.filter;
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this._filterDebouncer = Debouncer.debounce(this._filterDebouncer, timeOut.after(500), () => {
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if (serverFacade.getLastFilterSentToServer() === params.filter) {
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// Fixes the case when the filter changes
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// to something else and back to the original value
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// within debounce timeout, and the
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// DataCommunicator thinks it doesn't need to send data
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serverFacade.needsDataCommunicatorReset();
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}
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if (params.filter !== lastFilter) {
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throw new Error("Expected params.filter to be '" + lastFilter + "' but was '" + params.filter + "'");
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}
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// Remove the debouncer before clearing page callbacks.
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// This makes sure that they are executed.
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this._filterDebouncer = undefined;
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// Call the method again after debounce.
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clearPageCallbacks();
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comboBox.dataProvider(params, callback);
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});
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return;
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}
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// Postpone the execution of new callbacks if there is an active debouncer.
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// They will be executed when the page callbacks are cleared within the debouncer.
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if (this._filterDebouncer) {
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pageCallbacks[params.page] = callback;
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return;
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}
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if (cache[params.page]) {
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// This may happen after skipping pages by scrolling fast
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commitPage(params.page, callback);
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} else {
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pageCallbacks[params.page] = callback;
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const maxRangeCount = Math.max(params.pageSize * 2, 500); // Max item count in active range
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const activePages = Object.keys(pageCallbacks).map((page) => parseInt(page));
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const rangeMin = Math.min(...activePages);
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const rangeMax = Math.max(...activePages);
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if (activePages.length * params.pageSize > maxRangeCount) {
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if (params.page === rangeMin) {
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clearPageCallbacks([String(rangeMax)]);
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} else {
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clearPageCallbacks([String(rangeMin)]);
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}
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comboBox.dataProvider(params, callback);
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} else if (rangeMax - rangeMin + 1 !== activePages.length) {
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// Wasn't a sequential page index, clear the cache so combo-box will request for new pages
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clearPageCallbacks();
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} else {
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// The requested page was sequential, extend the requested range
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const startIndex = params.pageSize * rangeMin;
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const endIndex = params.pageSize * (rangeMax + 1);
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serverFacade.requestData(startIndex, endIndex, params);
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}
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}
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};
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comboBox.$connector.clear = tryCatchWrapper((start, length) => {
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const firstPageToClear = Math.floor(start / comboBox.pageSize);
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const numberOfPagesToClear = Math.ceil(length / comboBox.pageSize);
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for (let i = firstPageToClear; i < firstPageToClear + numberOfPagesToClear; i++) {
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delete cache[i];
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}
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});
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comboBox.$connector.filter = tryCatchWrapper(function (item, filter) {
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filter = filter ? filter.toString().toLowerCase() : '';
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return comboBox._getItemLabel(item, comboBox.itemLabelPath).toString().toLowerCase().indexOf(filter) > -1;
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});
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comboBox.$connector.set = tryCatchWrapper(function (index, items, filter) {
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if (filter != serverFacade.getLastFilterSentToServer()) {
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return;
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}
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if (index % comboBox.pageSize != 0) {
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throw 'Got new data to index ' + index + ' which is not aligned with the page size of ' + comboBox.pageSize;
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}
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if (index === 0 && items.length === 0 && pageCallbacks[0]) {
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// Makes sure that the dataProvider callback is called even when server
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// returns empty data set (no items match the filter).
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cache[0] = [];
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return;
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}
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const firstPageToSet = index / comboBox.pageSize;
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const updatedPageCount = Math.ceil(items.length / comboBox.pageSize);
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for (let i = 0; i < updatedPageCount; i++) {
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let page = firstPageToSet + i;
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let slice = items.slice(i * comboBox.pageSize, (i + 1) * comboBox.pageSize);
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cache[page] = slice;
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}
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});
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comboBox.$connector.updateData = tryCatchWrapper(function (items) {
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const itemsMap = new Map(items.map((item) => [item.key, item]));
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comboBox.filteredItems = comboBox.filteredItems.map((item) => {
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return itemsMap.get(item.key) || item;
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});
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});
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comboBox.$connector.updateSize = tryCatchWrapper(function (newSize) {
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if (!comboBox._clientSideFilter) {
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// FIXME: It may be that this size set is unnecessary, since when
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// providing data to combobox via callback we may use data's size.
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// However, if this size reflect the whole data size, including
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// data not fetched yet into client side, and combobox expect it
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// to be set as such, the at least, we don't need it in case the
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// filter is clientSide only, since it'll increase the height of
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// the popup at only at first user filter to this size, while the
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// filtered items count are less.
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comboBox.size = newSize;
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}
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});
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comboBox.$connector.reset = tryCatchWrapper(function () {
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clearPageCallbacks();
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cache = {};
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comboBox.clearCache();
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});
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comboBox.$connector.confirm = tryCatchWrapper(function (id, filter) {
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if (filter != serverFacade.getLastFilterSentToServer()) {
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return;
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}
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// We're done applying changes from this batch, resolve pending
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// callbacks
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let activePages = Object.getOwnPropertyNames(pageCallbacks);
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for (let i = 0; i < activePages.length; i++) {
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let page = activePages[i];
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if (cache[page]) {
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commitPage(page, pageCallbacks[page]);
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}
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}
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// Let server know we're done
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comboBox.$server.confirmUpdate(id);
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});
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const commitPage = tryCatchWrapper(function (page, callback) {
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let data = cache[page];
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if (comboBox._clientSideFilter) {
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performClientSideFilter(data, comboBox.filter, callback);
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} else {
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// Remove the data if server-side filtering, but keep it for client-side
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// filtering
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delete cache[page];
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// FIXME: It may be that we ought to provide data.length instead of
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// comboBox.size and remove updateSize function.
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callback(data, comboBox.size);
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}
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});
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// Perform filter on client side (here) using the items from specified page
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// and submitting the filtered items to specified callback.
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// The filter used is the one from combobox, not the lastFilter stored since
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// that may not reflect user's input.
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const performClientSideFilter = tryCatchWrapper(function (page, filter, callback) {
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let filteredItems = page;
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if (filter) {
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filteredItems = page.filter((item) => comboBox.$connector.filter(item, filter));
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}
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callback(filteredItems, filteredItems.length);
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});
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// Prevent setting the custom value as the 'value'-prop automatically
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comboBox.addEventListener(
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'custom-value-set',
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tryCatchWrapper((e) => e.preventDefault())
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);
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})(comboBox)
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};
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})();
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window.Vaadin.ComboBoxPlaceholder = ComboBoxPlaceholder;
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