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data_cube.ts
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data_cube.ts
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import * as p from 'core/properties'
import {span} from 'core/dom'
import {Formatter, Column, Grid as SlickGrid, Group, GroupTotals, RowMetadata, ColumnMetadata} from 'slickgrid'
import {TableDataProvider, DTINDEX_NAME, DataTableView, DataTable} from './data_table'
import {Item} from "./table_column"
import {ColumnDataSource} from '../../sources/column_data_source'
import {CDSView} from '../../sources/cds_view'
import {RowAggregator} from './row_aggregators'
import {Model} from 'model'
interface GroupDataContext {
collapsed: boolean,
level: number,
title: string,
}
function groupCellFormatter(_row: number, _cell: number, _value: unknown, _columnDef: Column<Item>, dataContext: GroupDataContext): string {
const { collapsed, level, title } = dataContext
const toggle = span({
class: `slick-group-toggle ${collapsed ? 'collapsed' : 'expanded'}`,
style: { 'margin-left': `${level * 15}px`},
})
const titleElement = span({
class: 'slick-group-title',
level,
}, title)
return `${toggle.outerHTML}${titleElement.outerHTML}`
}
function indentFormatter(formatter?: Formatter<Item>, indent?: number): Formatter<Item> {
return (row: number, cell: number, value: unknown, columnDef: Column<Item>, dataContext: Item) => {
const spacer = span({
class: 'slick-group-toggle',
style: { 'margin-left': `${(indent || 0) * 15}px`},
})
const formatted = formatter ? formatter(row, cell, value, columnDef, dataContext) : `${value}`
return `${spacer.outerHTML}${formatted && formatted.replace(/^<div/, '<span').replace(/div>$/, 'span>')}`
}
}
function handleGridClick(this: SlickGrid<Item>, event: Event, args: { row: number }): void {
const item = this.getDataItem(args.row)
if (item instanceof Group && (event.target as HTMLElement).classList.contains('slick-group-toggle')) {
if (item.collapsed) {
this.getData().expandGroup(item.groupingKey)
} else {
this.getData().collapseGroup(item.groupingKey)
}
event.stopImmediatePropagation()
event.preventDefault()
this.invalidate()
this.render()
}
}
export namespace GroupingInfo {
export type Attrs = p.AttrsOf<Props>
export type Props = Model.Props & {
getter: p.Property<string>
aggregators: p.Property<RowAggregator[]>
collapsed: p.Property<boolean>
}
}
export interface GroupingInfo extends GroupingInfo.Attrs {}
export class GroupingInfo extends Model {
properties: GroupingInfo.Props
constructor(attrs?: Partial<GroupingInfo.Attrs>) {
super(attrs)
}
static init_GroupingInfo(): void {
this.define<GroupingInfo.Props>({
getter: [ p.String, '' ],
aggregators: [ p.Array, [] ],
collapsed: [ p.Boolean, false ],
})
}
get comparer(): (a: { value: any }, b: { value: any }) => number {
return (a: { value: any }, b: { value: any }): number => {
return a.value === b.value ? 0 : a.value > b.value ? 1 : -1
}
}
}
export class DataCubeProvider extends TableDataProvider {
readonly columns: Column<Item>[]
groupingInfos: GroupingInfo[]
readonly groupingDelimiter: string
toggledGroupsByLevel: {[key: string]: boolean}[]
private rows: (Group<number> | number)[]
target: ColumnDataSource
constructor(source: ColumnDataSource, view: CDSView, columns: Column<Item>[], target: ColumnDataSource) {
super(source, view)
this.columns = columns
this.groupingInfos = []
this.groupingDelimiter = ':|:'
this.target = target
}
setGrouping(groupingInfos: GroupingInfo[]): void {
this.groupingInfos = groupingInfos
this.toggledGroupsByLevel = groupingInfos.map(() => ({}))
this.refresh()
}
private extractGroups(rows: number[], parentGroup?: Group<number>): Group<number>[] {
const groups: Group<number>[] = []
const groupsByValue: Map<any, Group<number>> = new Map()
const level = parentGroup ? parentGroup.level + 1 : 0
const { comparer, getter } = this.groupingInfos[level]
rows.forEach((row) => {
const value = this.source.data[getter][row]
let group = groupsByValue.get(value)
if (!group) {
const groupingKey = parentGroup ? `${parentGroup.groupingKey}${this.groupingDelimiter}${value}` : `${value}`
group = Object.assign(new Group(), {value, level, groupingKey}) as any
groups.push(group!)
groupsByValue.set(value, group!)
}
group!.rows.push(row)
})
if (level < this.groupingInfos.length - 1) {
groups.forEach((group) => {
group.groups = this.extractGroups(group.rows, group)
})
}
groups.sort(comparer)
return groups
}
private calculateTotals(group: Group<number>, aggregators: RowAggregator[]): GroupTotals<number> {
const totals: GroupTotals<number> = { avg: {}, max: {}, min: {}, sum: {} } as any
const { source: { data } } = this
const keys = Object.keys(data)
const items = group.rows.map(i => keys.reduce((o, c) => ({ ...o, [c]: data[c][i] }), {}))
aggregators.forEach((aggregator) => {
aggregator.init()
items.forEach((item) => aggregator.accumulate(item))
aggregator.storeResult(totals)
})
return totals
}
private addTotals(groups: Group<number>[], level = 0): void {
const { aggregators, collapsed: groupCollapsed } = this.groupingInfos[level]
const toggledGroups = this.toggledGroupsByLevel[level]
groups.forEach((group) => {
if (group.groups) {
this.addTotals(group.groups, level + 1)
}
if (aggregators.length && group.rows.length) {
group.totals = this.calculateTotals(group, aggregators)
}
group.collapsed = groupCollapsed !== toggledGroups[group.groupingKey]
group.title = group.value ? `${group.value}` : ""
})
}
private flattenedGroupedRows(groups: Group<number>[], level = 0): (Group<number> | number)[] {
const rows: (Group<number> | number)[] = []
groups.forEach((group) => {
rows.push(group)
if (!group.collapsed) {
const subRows = group.groups
? this.flattenedGroupedRows(group.groups, level + 1)
: group.rows
rows.push(...subRows)
}
})
return rows
}
refresh(): void {
const groups = this.extractGroups(this.view.indices)
const labels = this.source.data[this.columns[0].field!]
if (groups.length) {
this.addTotals(groups)
this.rows = this.flattenedGroupedRows(groups)
this.target.data = {
row_indices: this.rows.map(value => value instanceof Group ? (value as Group<number>).rows : value),
labels: this.rows.map(value => value instanceof Group ? (value as Group<number>).title : labels[value as number]),
}
}
}
getLength(): number {
return this.rows.length
}
getItem(i: number): Item {
const item = this.rows[i]
const {source: {data}} = this
return item instanceof Group
? item as Item
: Object.keys(data)
.reduce((o, c) => ({...o, [c]: data[c][item as number]}), {[DTINDEX_NAME]: item})
}
getItemMetadata(i: number): RowMetadata<Item> {
const myItem = this.rows[i]
const columns = this.columns.slice(1)
const aggregators = myItem instanceof Group
? this.groupingInfos[(myItem as Group<number>).level].aggregators
: []
function adapter(column: Column<Item>): ColumnMetadata<Item> {
const {field: myField, formatter} = column
const aggregator = aggregators.find(({ field_ }) => field_ === myField)
if (aggregator) {
const {key} = aggregator
return {
formatter(row: number, cell: number, _value: unknown, columnDef: Column<Item>, dataContext: Item): string {
return formatter ? formatter(row, cell, dataContext.totals[key][myField!], columnDef, dataContext) : ''
},
}
}
return {}
}
return myItem instanceof Group
? {
selectable: false,
focusable: false,
cssClasses: 'slick-group',
columns: [{ formatter: groupCellFormatter }, ...columns.map(adapter)] as any,
}
: {}
}
collapseGroup(groupingKey: string): void {
const level = groupingKey.split(this.groupingDelimiter).length - 1
this.toggledGroupsByLevel[level][groupingKey] = !this.groupingInfos[level].collapsed
this.refresh()
}
expandGroup(groupingKey: string): void {
const level = groupingKey.split(this.groupingDelimiter).length - 1
this.toggledGroupsByLevel[level][groupingKey] = this.groupingInfos[level].collapsed
this.refresh()
}
}
export class DataCubeView extends DataTableView {
model: DataCube
protected data: DataCubeProvider
render(): void {
const options = {
enableCellNavigation: this.model.selectable !== false,
enableColumnReorder: false,
forceFitColumns: this.model.fit_columns,
multiColumnSort: false,
editable: this.model.editable,
autoEdit: false,
rowHeight: this.model.row_height,
}
const columns = this.model.columns.map(column => column.toColumn())
columns[0].formatter = indentFormatter(columns[0].formatter, this.model.grouping.length)
delete columns[0].editor
this.data = new DataCubeProvider(
this.model.source,
this.model.view,
columns,
this.model.target,
)
this.data.setGrouping(this.model.grouping)
this.el.style.width = `${this.model.width}px`
this.grid = new SlickGrid(
this.el,
this.data,
columns,
options,
)
this.grid.onClick.subscribe(handleGridClick)
}
}
export namespace DataCube {
export type Attrs = p.AttrsOf<Props>
export type Props = DataTable.Props & {
grouping: p.Property<GroupingInfo[]>,
target: p.Property<ColumnDataSource>,
}
}
export interface DataCube extends DataCube.Attrs {}
export class DataCube extends DataTable {
properties: DataCube.Props
constructor(attrs?: Partial<DataCube.Attrs>) {
super(attrs)
}
static init_DataCube(): void {
this.prototype.default_view = DataCubeView
this.define<DataCube.Props>({
grouping: [p.Array, []],
target: [p.Instance ],
})
}
}