@bimeister/pupakit.tree
Version:
PupaKit Tree
187 lines • 35.2 kB
JavaScript
import '@angular/core';
import '@bimeister/event-bus/rxjs';
import { QueueEvents } from '@bimeister/pupakit.common';
import { isNil } from '@bimeister/utilities';
import { Subscription } from 'rxjs';
import { filter, mapTo, switchMap, withLatestFrom } from 'rxjs/operators';
import { TreeEvents } from '../events/tree.events';
import { FlatTreeItem } from './flat-tree-item.class';
import './tree-data-display-collection.class';
export class DefaultTreeEventHandler {
constructor(eventBus, dataDisplayCollection) {
this.eventBus = eventBus;
this.dataDisplayCollection = dataDisplayCollection;
this.subscription = new Subscription();
this.reconnect();
}
subscribeToEvents() {
this.subscription.add(this.getSubscriptionToSetData());
this.subscription.add(this.getSubscriptionForUpdateItem());
this.subscription.add(this.getSubscriptionForRemoveItem());
this.subscription.add(this.getSubscriptionForScrollTo());
this.subscription.add(this.getSubscriptionForRemoveChildren());
this.subscription.add(this.getSubscriptionForSetChildren());
}
getSubscriptionToSetData() {
return this.getEvents(TreeEvents.SetData)
.pipe(switchMap((event) => this.dataDisplayCollection.setData(event.payload).pipe(mapTo(event))))
.subscribe((event) => this.eventBus.dispatch(new QueueEvents.RemoveFromQueue(event.id)));
}
getSubscriptionForScrollTo() {
return this.getEvents(TreeEvents.ScrollById)
.pipe(withLatestFrom(this.dataDisplayCollection.data$))
.subscribe(([event, data]) => {
const treeItem = DefaultTreeEventHandler.getTreeItem(event.payload, data);
if (isNil(treeItem)) {
return this.eventBus.dispatch(new QueueEvents.RemoveFromQueue(event.id));
}
const index = data.indexOf(treeItem);
this.eventBus.dispatch(new TreeEvents.ScrollByIndex(index));
this.eventBus.dispatch(new QueueEvents.RemoveFromQueue(event.id));
});
}
getSubscriptionForRemoveItem() {
return this.getEvents(TreeEvents.RemoveItem)
.pipe(withLatestFrom(this.dataDisplayCollection.data$, this.dataDisplayCollection.expandedIdsList$))
.subscribe(([event, data, expandedIdsList]) => {
this.removeItemWithChildren(event.payload, data, expandedIdsList);
this.eventBus.dispatch(new QueueEvents.RemoveFromQueue(event.id));
});
}
getSubscriptionForUpdateItem() {
return this.getEvents(TreeEvents.UpdateItem)
.pipe(withLatestFrom(this.dataDisplayCollection.data$))
.subscribe(([event, data]) => {
this.updateItem(event.payload, data);
this.eventBus.dispatch(new QueueEvents.RemoveFromQueue(event.id));
});
}
updateItem(updatedItem, data) {
const treeItemExists = DefaultTreeEventHandler.treeItemExists(updatedItem.id, data);
if (!treeItemExists) {
return;
}
const updatedData = data.map((treeItem) => {
if (treeItem.id === updatedItem.id) {
return new FlatTreeItem(treeItem.isExpandable, updatedItem.name, treeItem.level, treeItem.id, updatedItem.originalData, treeItem.isElement);
}
return treeItem;
});
this.eventBus.dispatch(new TreeEvents.SetData(updatedData));
}
removeItem(removeItemId, data) {
const treeItemExists = DefaultTreeEventHandler.treeItemExists(removeItemId, data);
if (!treeItemExists) {
return;
}
const updatedData = data.filter((treeItem) => treeItem.id !== removeItemId);
this.eventBus.dispatch(new TreeEvents.SetData(updatedData));
}
reconnect() {
this.disconnect();
this.subscribeToEvents();
}
disconnect() {
this.subscription.unsubscribe();
this.subscription = new Subscription();
}
getEvents(eventType) {
return this.eventBus
.listen()
.pipe(filter((event) => event instanceof eventType));
}
getSubscriptionForSetChildren() {
return this.getEvents(TreeEvents.SetChildren)
.pipe(withLatestFrom(this.dataDisplayCollection.data$, this.dataDisplayCollection.expandedIdsList$))
.subscribe(([event, data, expandedIdsList]) => {
this.setChildren(event.payload.treeItemId, event.payload.children, data, expandedIdsList);
this.eventBus.dispatch(new QueueEvents.RemoveFromQueue(event.id));
});
}
getSubscriptionForRemoveChildren() {
return this.getEvents(TreeEvents.RemoveChildren)
.pipe(withLatestFrom(this.dataDisplayCollection.data$, this.dataDisplayCollection.expandedIdsList$))
.subscribe(([event, data, expandedIdsList]) => {
this.removeChildren(event.payload, data, expandedIdsList);
this.eventBus.dispatch(new QueueEvents.RemoveFromQueue(event.id));
});
}
setChildren(parentId, children, data, expandedIdsList) {
if (isNil(parentId)) {
const newData = children.map((treeItem) => ({ ...treeItem, level: 0 }));
this.eventBus.dispatch(new TreeEvents.SetData(newData));
this.eventBus.dispatch(new TreeEvents.SetExpanded([]));
return;
}
const parentIsExpanded = expandedIdsList.includes(parentId);
if (parentIsExpanded) {
return;
}
const parent = DefaultTreeEventHandler.getTreeItem(parentId, data);
const isExpanded = expandedIdsList.includes(parentId);
if (isNil(parent) || isExpanded) {
return;
}
const childrenIdsSet = new Set();
const childrenWithLevel = children.map((childItem) => {
childrenIdsSet.add(childItem.id);
return {
...childItem,
level: Number(parent.level) + 1,
};
});
const parentIndex = data.indexOf(parent);
const dataWithChildren = [
...data.slice(0, parentIndex),
parent,
...childrenWithLevel,
...data.slice(parentIndex + 1),
];
const noExpandedChildrenList = expandedIdsList.filter((expandedTreeItemId) => !childrenIdsSet.has(expandedTreeItemId));
const newExpandedList = [...noExpandedChildrenList, parent.id];
this.eventBus.dispatch(new TreeEvents.SetData(dataWithChildren));
this.eventBus.dispatch(new TreeEvents.SetExpanded(newExpandedList));
}
removeItemWithChildren(removeItemId, data, expanded) {
const treeItemExists = DefaultTreeEventHandler.treeItemExists(removeItemId, data);
if (!treeItemExists) {
this.eventBus.dispatch(new TreeEvents.SetData(data));
this.eventBus.dispatch(new TreeEvents.SetExpanded(expanded));
return;
}
const [dataWithoutChildren, expandedWithoutChildren] = this.getRemovedChildren(removeItemId, data, expanded);
const dataWithoutRemovedItem = dataWithoutChildren.filter((treeItem) => treeItem.id !== removeItemId);
this.eventBus.dispatch(new TreeEvents.SetData(dataWithoutRemovedItem));
this.eventBus.dispatch(new TreeEvents.SetExpanded(expandedWithoutChildren));
}
removeChildren(parentId, data, expanded) {
const [dataWithoutChildren, expandedWithoutChildren] = this.getRemovedChildren(parentId, data, expanded);
this.eventBus.dispatch(new TreeEvents.SetData(dataWithoutChildren));
this.eventBus.dispatch(new TreeEvents.SetExpanded(expandedWithoutChildren));
}
getRemovedChildren(parentId, data, expanded) {
const parent = DefaultTreeEventHandler.getTreeItem(parentId, data);
if (isNil(parent)) {
return [data, expanded];
}
const parentIndex = data.indexOf(parent);
const dataBeforeParent = parentIndex === 0 ? [] : data.slice(0, parentIndex);
const dataAfterParent = data.slice(parentIndex + 1);
const nextNonChildIndex = dataAfterParent.findIndex((dataItem) => dataItem.level <= parent.level);
const isLastParent = nextNonChildIndex === -1;
const children = dataAfterParent.slice(0, nextNonChildIndex);
const childrenIdsList = children.map((child) => child.id);
const expandedWithoutChildren = expanded.filter((expandedItemId) => !childrenIdsList.includes(expandedItemId) && expandedItemId !== parentId);
const dataAfterLastChild = isLastParent ? [] : dataAfterParent.slice(nextNonChildIndex);
const dataWithoutChildren = [...dataBeforeParent, parent, ...dataAfterLastChild];
return [dataWithoutChildren, expandedWithoutChildren];
}
static treeItemExists(treeItemId, data) {
const treeItem = DefaultTreeEventHandler.getTreeItem(treeItemId, data);
return !isNil(treeItem);
}
static getTreeItem(treeItemId, data) {
return data.find((treeItem) => treeItem.id === treeItemId);
}
}
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{ Type } from '@angular/core';\nimport { EventBus } from '@bimeister/event-bus/rxjs';\nimport { QueueEvents } from '@bimeister/pupakit.common';\nimport { isNil } from '@bimeister/utilities';\nimport { Observable, Subscription } from 'rxjs';\nimport { filter, mapTo, switchMap, withLatestFrom } from 'rxjs/operators';\nimport { TreeEvents } from '../events/tree.events';\nimport { FlatTreeItem } from './flat-tree-item.class';\nimport { TreeDataDisplayCollection } from './tree-data-display-collection.class';\n\nexport class DefaultTreeEventHandler {\n  protected subscription: Subscription = new Subscription();\n\n  constructor(\n    protected readonly eventBus: EventBus,\n    protected readonly dataDisplayCollection: TreeDataDisplayCollection\n  ) {\n    this.reconnect();\n  }\n\n  protected subscribeToEvents(): void {\n    this.subscription.add(this.getSubscriptionToSetData());\n    this.subscription.add(this.getSubscriptionForUpdateItem());\n    this.subscription.add(this.getSubscriptionForRemoveItem());\n    this.subscription.add(this.getSubscriptionForScrollTo());\n    this.subscription.add(this.getSubscriptionForRemoveChildren());\n    this.subscription.add(this.getSubscriptionForSetChildren());\n  }\n\n  protected getSubscriptionToSetData(): Subscription {\n    return this.getEvents(TreeEvents.SetData)\n      .pipe(\n        switchMap((event: TreeEvents.SetData) => this.dataDisplayCollection.setData(event.payload).pipe(mapTo(event)))\n      )\n      .subscribe((event: TreeEvents.SetData) => this.eventBus.dispatch(new QueueEvents.RemoveFromQueue(event.id)));\n  }\n\n  protected getSubscriptionForScrollTo(): Subscription {\n    return this.getEvents(TreeEvents.ScrollById)\n      .pipe(withLatestFrom(this.dataDisplayCollection.data$))\n      .subscribe(([event, data]: [TreeEvents.ScrollById, FlatTreeItem[]]) => {\n        const treeItem: FlatTreeItem = DefaultTreeEventHandler.getTreeItem(event.payload, data);\n        if (isNil(treeItem)) {\n          return this.eventBus.dispatch(new QueueEvents.RemoveFromQueue(event.id));\n        }\n        const index: number = data.indexOf(treeItem);\n        this.eventBus.dispatch(new TreeEvents.ScrollByIndex(index));\n        this.eventBus.dispatch(new QueueEvents.RemoveFromQueue(event.id));\n      });\n  }\n\n  protected getSubscriptionForRemoveItem(): Subscription {\n    return this.getEvents(TreeEvents.RemoveItem)\n      .pipe(withLatestFrom(this.dataDisplayCollection.data$, this.dataDisplayCollection.expandedIdsList$))\n      .subscribe(([event, data, expandedIdsList]: [TreeEvents.RemoveItem, FlatTreeItem[], string[]]) => {\n        this.removeItemWithChildren(event.payload, data, expandedIdsList);\n        this.eventBus.dispatch(new QueueEvents.RemoveFromQueue(event.id));\n      });\n  }\n\n  protected getSubscriptionForUpdateItem(): Subscription {\n    return this.getEvents(TreeEvents.UpdateItem)\n      .pipe(withLatestFrom(this.dataDisplayCollection.data$))\n      .subscribe(([event, data]: [TreeEvents.UpdateItem, FlatTreeItem[]]) => {\n        this.updateItem(event.payload, data);\n        this.eventBus.dispatch(new QueueEvents.RemoveFromQueue(event.id));\n      });\n  }\n\n  protected updateItem(updatedItem: FlatTreeItem, data: FlatTreeItem[]): void {\n    const treeItemExists: boolean = DefaultTreeEventHandler.treeItemExists(updatedItem.id, data);\n    if (!treeItemExists) {\n      return;\n    }\n    const updatedData: FlatTreeItem[] = data.map((treeItem: FlatTreeItem) => {\n      if (treeItem.id === updatedItem.id) {\n        return new FlatTreeItem(\n          treeItem.isExpandable,\n          updatedItem.name,\n          treeItem.level,\n          treeItem.id,\n          updatedItem.originalData,\n          treeItem.isElement\n        );\n      }\n      return treeItem;\n    });\n    this.eventBus.dispatch(new TreeEvents.SetData(updatedData));\n  }\n\n  protected removeItem(removeItemId: string, data: FlatTreeItem[]): void {\n    const treeItemExists: boolean = DefaultTreeEventHandler.treeItemExists(removeItemId, data);\n    if (!treeItemExists) {\n      return;\n    }\n    const updatedData: FlatTreeItem[] = data.filter((treeItem: FlatTreeItem) => treeItem.id !== removeItemId);\n    this.eventBus.dispatch(new TreeEvents.SetData(updatedData));\n  }\n\n  public reconnect(): void {\n    this.disconnect();\n    this.subscribeToEvents();\n  }\n\n  public disconnect(): void {\n    this.subscription.unsubscribe();\n    this.subscription = new Subscription();\n  }\n\n  public getEvents<E extends TreeEvents.TreeEventBase>(eventType: Type<E>): Observable<E> {\n    return this.eventBus\n      .listen()\n      .pipe(filter((event: TreeEvents.TreeEventBase): event is E => event instanceof eventType));\n  }\n\n  private getSubscriptionForSetChildren(): Subscription {\n    return this.getEvents(TreeEvents.SetChildren)\n      .pipe(withLatestFrom(this.dataDisplayCollection.data$, this.dataDisplayCollection.expandedIdsList$))\n      .subscribe(([event, data, expandedIdsList]: [TreeEvents.SetChildren, FlatTreeItem[], string[]]) => {\n        this.setChildren(event.payload.treeItemId, event.payload.children, data, expandedIdsList);\n        this.eventBus.dispatch(new QueueEvents.RemoveFromQueue(event.id));\n      });\n  }\n\n  private getSubscriptionForRemoveChildren(): Subscription {\n    return this.getEvents(TreeEvents.RemoveChildren)\n      .pipe(withLatestFrom(this.dataDisplayCollection.data$, this.dataDisplayCollection.expandedIdsList$))\n      .subscribe(([event, data, expandedIdsList]: [TreeEvents.RemoveChildren, FlatTreeItem[], string[]]) => {\n        this.removeChildren(event.payload, data, expandedIdsList);\n        this.eventBus.dispatch(new QueueEvents.RemoveFromQueue(event.id));\n      });\n  }\n\n  private setChildren(\n    parentId: string,\n    children: FlatTreeItem[],\n    data: FlatTreeItem[],\n    expandedIdsList: string[]\n  ): void {\n    if (isNil(parentId)) {\n      const newData: FlatTreeItem[] = children.map((treeItem: FlatTreeItem) => ({ ...treeItem, level: 0 }));\n      this.eventBus.dispatch(new TreeEvents.SetData(newData));\n      this.eventBus.dispatch(new TreeEvents.SetExpanded([]));\n      return;\n    }\n    const parentIsExpanded: boolean = expandedIdsList.includes(parentId);\n    if (parentIsExpanded) {\n      return;\n    }\n    const parent: FlatTreeItem = DefaultTreeEventHandler.getTreeItem(parentId, data);\n    const isExpanded: boolean = expandedIdsList.includes(parentId);\n    if (isNil(parent) || isExpanded) {\n      return;\n    }\n    const childrenIdsSet: Set<string> = new Set();\n    const childrenWithLevel: FlatTreeItem[] = children.map((childItem: FlatTreeItem) => {\n      childrenIdsSet.add(childItem.id);\n      return {\n        ...childItem,\n        level: Number(parent.level) + 1,\n      };\n    });\n    const parentIndex: number = data.indexOf(parent);\n    const dataWithChildren: FlatTreeItem[] = [\n      ...data.slice(0, parentIndex),\n      parent,\n      ...childrenWithLevel,\n      ...data.slice(parentIndex + 1),\n    ];\n    const noExpandedChildrenList: string[] = expandedIdsList.filter(\n      (expandedTreeItemId: string) => !childrenIdsSet.has(expandedTreeItemId)\n    );\n    const newExpandedList: string[] = [...noExpandedChildrenList, parent.id];\n    this.eventBus.dispatch(new TreeEvents.SetData(dataWithChildren));\n    this.eventBus.dispatch(new TreeEvents.SetExpanded(newExpandedList));\n  }\n\n  private removeItemWithChildren(removeItemId: string, data: FlatTreeItem[], expanded: string[]): void {\n    const treeItemExists: boolean = DefaultTreeEventHandler.treeItemExists(removeItemId, data);\n    if (!treeItemExists) {\n      this.eventBus.dispatch(new TreeEvents.SetData(data));\n      this.eventBus.dispatch(new TreeEvents.SetExpanded(expanded));\n      return;\n    }\n    const [dataWithoutChildren, expandedWithoutChildren]: [FlatTreeItem[], string[]] = this.getRemovedChildren(\n      removeItemId,\n      data,\n      expanded\n    );\n    const dataWithoutRemovedItem: FlatTreeItem[] = dataWithoutChildren.filter(\n      (treeItem: FlatTreeItem) => treeItem.id !== removeItemId\n    );\n    this.eventBus.dispatch(new TreeEvents.SetData(dataWithoutRemovedItem));\n    this.eventBus.dispatch(new TreeEvents.SetExpanded(expandedWithoutChildren));\n  }\n\n  private removeChildren(parentId: string, data: FlatTreeItem[], expanded: string[]): void {\n    const [dataWithoutChildren, expandedWithoutChildren]: [FlatTreeItem[], string[]] = this.getRemovedChildren(\n      parentId,\n      data,\n      expanded\n    );\n    this.eventBus.dispatch(new TreeEvents.SetData(dataWithoutChildren));\n    this.eventBus.dispatch(new TreeEvents.SetExpanded(expandedWithoutChildren));\n  }\n\n  private getRemovedChildren(parentId: string, data: FlatTreeItem[], expanded: string[]): [FlatTreeItem[], string[]] {\n    const parent: FlatTreeItem = DefaultTreeEventHandler.getTreeItem(parentId, data);\n    if (isNil(parent)) {\n      return [data, expanded];\n    }\n    const parentIndex: number = data.indexOf(parent);\n    const dataBeforeParent: FlatTreeItem[] = parentIndex === 0 ? [] : data.slice(0, parentIndex);\n    const dataAfterParent: FlatTreeItem[] = data.slice(parentIndex + 1);\n    const nextNonChildIndex: number = dataAfterParent.findIndex(\n      (dataItem: FlatTreeItem) => dataItem.level <= parent.level\n    );\n    const isLastParent: boolean = nextNonChildIndex === -1;\n    const children: FlatTreeItem[] = dataAfterParent.slice(0, nextNonChildIndex);\n    const childrenIdsList: string[] = children.map((child: FlatTreeItem) => child.id);\n    const expandedWithoutChildren: string[] = expanded.filter(\n      (expandedItemId: string) => !childrenIdsList.includes(expandedItemId) && expandedItemId !== parentId\n    );\n    const dataAfterLastChild: FlatTreeItem[] = isLastParent ? [] : dataAfterParent.slice(nextNonChildIndex);\n    const dataWithoutChildren: FlatTreeItem[] = [...dataBeforeParent, parent, ...dataAfterLastChild];\n    return [dataWithoutChildren, expandedWithoutChildren];\n  }\n\n  protected static treeItemExists(treeItemId: string, data: FlatTreeItem[]): boolean {\n    const treeItem: FlatTreeItem = DefaultTreeEventHandler.getTreeItem(treeItemId, data);\n    return !isNil(treeItem);\n  }\n\n  protected static getTreeItem(treeItemId: string, data: FlatTreeItem[]): FlatTreeItem {\n    return data.find((treeItem: FlatTreeItem) => treeItem.id === treeItemId);\n  }\n}\n"]}