@bimeister/pupakit.tree
Version:
PupaKit Tree
161 lines • 26.1 kB
JavaScript
import { Injectable } from '@angular/core';
import '@bimeister/pupakit.common';
import { getClampedValue, isNil } from '@bimeister/utilities';
import { BehaviorSubject, Subject, timer } from 'rxjs';
import { take, withLatestFrom } from 'rxjs/operators';
import '../interfaces/drop-event.interface';
import './flat-tree-item.class';
import * as i0 from "@angular/core";
export class TreeDragAndDropControl {
constructor() {
this.draggingHasStarted$ = new BehaviorSubject(false);
this.droppedSubject$ = new Subject();
this.draggableNode$ = new BehaviorSubject(null);
this.scrollDirection$ = new BehaviorSubject(null);
this.expandNodeWithDelay$ = new Subject();
this.hasDragAndDrop$ = new BehaviorSubject(false);
this.mouseDownPosition = null;
this.draggableElementBoundingBox = null;
this.draggableExpandableDescendants = [];
}
setHostAndRenderer(host, renderer) {
this.host = host;
this.renderer = renderer;
}
setHasDragAndDrop(hasDragAndDrop) {
this.hasDragAndDrop$.next(hasDragAndDrop);
}
mouseDown(treeNode, event) {
this.hasDragAndDrop$.pipe(take(1)).subscribe((hasDragAndDrop) => {
if (!hasDragAndDrop) {
return;
}
this.draggableNode$.next(treeNode);
this.mouseDownPosition = {
left: event.screenX,
top: event.screenY,
};
if (event.target instanceof HTMLElement) {
this.draggableElementBoundingBox = event.target.getBoundingClientRect();
}
});
}
mouseMove({ screenX, screenY }, draggableElement, data$) {
if (isNil(this.mouseDownPosition)) {
return;
}
this.draggingHasStarted$.pipe(take(1)).subscribe((draggingHasStarted) => {
const dragDistanceSqr = Math.pow(this.mouseDownPosition.left - screenX, 2) + Math.pow(this.mouseDownPosition.top - screenY, 2);
const druggingMustBeStarted = dragDistanceSqr > this.draggableElementBoundingBox?.height / 2;
if (!draggingHasStarted && druggingMustBeStarted) {
this.startDragging(draggableElement, data$);
this.draggingHasStarted$.next(true);
this.updateDraggablePosition(screenX, screenY, draggableElement);
}
if (draggingHasStarted) {
this.updateDraggablePosition(screenX, screenY, draggableElement);
}
});
}
mouseUp() {
this.draggingHasStarted$
.pipe(take(1), withLatestFrom(this.draggableNode$))
.subscribe(([draggingHasStarted, draggableNode]) => {
if (draggingHasStarted && !isNil(this.dropNode)) {
this.droppedSubject$.next({
draggedElement: draggableNode,
droppedElement: this.dropNode,
});
}
this.draggingHasStarted$.next(false);
this.draggableNode$.next(null);
this.dropNode = null;
this.mouseDownPosition = null;
this.draggableElementBoundingBox = null;
this.scrollDirection$.next(null);
this.draggableExpandableDescendants = [];
});
}
mouseEnter(node) {
this.draggingHasStarted$.pipe(take(1)).subscribe((draggingHasStarted) => {
if (!draggingHasStarted) {
return;
}
if (!node.isElement) {
this.dropNode = node;
}
if (this.canDrop(node)) {
this.expandNodeWithDelay$.next(node);
}
});
}
canDrop(node) {
if (isNil(node)) {
return false;
}
return node.isExpandable && !this.draggableExpandableDescendants.includes(node.id);
}
mouseLeave() {
this.draggingHasStarted$.pipe(take(1)).subscribe((draggingHasStarted) => {
if (!draggingHasStarted) {
return;
}
this.dropNode = null;
this.expandNodeWithDelay$.next(null);
});
}
startDragging(draggableElement, data$) {
this.setupWidthForDraggableElement(draggableElement);
this.setupDraggableExpandableDescendants(data$);
}
setupWidthForDraggableElement(draggableElement) {
timer(0)
.pipe(take(1))
.subscribe(() => {
this.renderer.setStyle(draggableElement.nativeElement, 'width', `${this.draggableElementBoundingBox.width}px`);
});
}
setupDraggableExpandableDescendants(data$) {
data$
.pipe(take(1), withLatestFrom(this.draggableNode$))
.subscribe(([treeItems, draggableNode]) => {
const targetLevel = draggableNode?.level ?? 0;
let currentIndex = treeItems.findIndex((dataPoint) => dataPoint.id === draggableNode?.id) + 1;
const endOfListNotReached = () => treeItems.length !== currentIndex;
const targetLevelNotReached = () => treeItems[currentIndex].level !== targetLevel;
const result = [draggableNode?.id];
while (endOfListNotReached() && targetLevelNotReached()) {
const currentNode = treeItems[currentIndex];
if (currentNode.isExpandable) {
result.push(currentNode.id);
}
currentIndex++;
}
this.draggableExpandableDescendants = result;
});
}
updateDraggablePosition(screenX, screenY, draggableElement) {
const draggableElementPositionShift = {
left: this.mouseDownPosition.left - this.draggableElementBoundingBox.left,
top: this.mouseDownPosition.top - this.draggableElementBoundingBox.top,
};
const bottomBorderPositionY = this.host.nativeElement.clientHeight - this.draggableElementBoundingBox.height;
const draggableElementPosition = {
left: screenX - this.draggableElementBoundingBox.left - draggableElementPositionShift.left,
top: getClampedValue(screenY - draggableElementPositionShift.top, 0, bottomBorderPositionY),
};
const isTopBorderReached = draggableElementPosition.top <= this.draggableElementBoundingBox.height;
const isBottomBorderReached = draggableElementPosition.top >= bottomBorderPositionY;
this.scrollDirection$.next(isTopBorderReached ? 'up' : isBottomBorderReached ? 'down' : null);
if (!isNil(draggableElement)) {
this.renderer.setStyle(draggableElement.nativeElement, 'left', `${draggableElementPosition.left}px`);
this.renderer.setStyle(draggableElement.nativeElement, 'top', `${draggableElementPosition.top}px`);
}
}
}
TreeDragAndDropControl.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "14.2.12", ngImport: i0, type: TreeDragAndDropControl, deps: [], target: i0.ɵɵFactoryTarget.Injectable });
TreeDragAndDropControl.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "14.2.12", ngImport: i0, type: TreeDragAndDropControl });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "14.2.12", ngImport: i0, type: TreeDragAndDropControl, decorators: [{
type: Injectable
}] });
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{ ElementRef, Injectable, Renderer2 } from '@angular/core';\nimport { Uuid } from '@bimeister/pupakit.common';\nimport { getClampedValue, isNil, Nullable } from '@bimeister/utilities';\nimport { BehaviorSubject, Observable, Subject, timer } from 'rxjs';\nimport { take, withLatestFrom } from 'rxjs/operators';\nimport { DropEventInterface } from '../interfaces/drop-event.interface';\nimport { FlatTreeItem } from './flat-tree-item.class';\n\ninterface Position {\n  top: number;\n  left: number;\n}\n\n/**\n * @deprecated\n */\n@Injectable()\nexport class TreeDragAndDropControl {\n  public readonly draggingHasStarted$: BehaviorSubject<boolean> = new BehaviorSubject<boolean>(false);\n  public readonly droppedSubject$: Subject<DropEventInterface<FlatTreeItem>> = new Subject();\n  public readonly draggableNode$: BehaviorSubject<Nullable<FlatTreeItem>> = new BehaviorSubject<Nullable<FlatTreeItem>>(\n    null\n  );\n  public readonly scrollDirection$: BehaviorSubject<Nullable<'up' | 'down'>> = new BehaviorSubject<\n    Nullable<'up' | 'down'>\n  >(null);\n  public readonly expandNodeWithDelay$: Subject<FlatTreeItem | null> = new Subject<FlatTreeItem | null>();\n\n  private readonly hasDragAndDrop$: BehaviorSubject<boolean> = new BehaviorSubject(false);\n  /** @deprecated mutable object */\n  private dropNode: FlatTreeItem | null;\n  /** @deprecated mutable object */\n  private mouseDownPosition: Position | null = null;\n  /** @deprecated mutable object */\n  private draggableElementBoundingBox: DOMRect | null = null;\n  private draggableExpandableDescendants: Uuid[] = [];\n  private renderer: Renderer2;\n  private host: ElementRef<HTMLElement>;\n\n  public setHostAndRenderer(host: ElementRef<HTMLElement>, renderer: Renderer2): void {\n    this.host = host;\n    this.renderer = renderer;\n  }\n\n  public setHasDragAndDrop(hasDragAndDrop: boolean): void {\n    this.hasDragAndDrop$.next(hasDragAndDrop);\n  }\n\n  public mouseDown(treeNode: FlatTreeItem, event: MouseEvent): void {\n    this.hasDragAndDrop$.pipe(take(1)).subscribe((hasDragAndDrop: boolean) => {\n      if (!hasDragAndDrop) {\n        return;\n      }\n\n      this.draggableNode$.next(treeNode);\n      this.mouseDownPosition = {\n        left: event.screenX,\n        top: event.screenY,\n      };\n      if (event.target instanceof HTMLElement) {\n        this.draggableElementBoundingBox = event.target.getBoundingClientRect();\n      }\n    });\n  }\n\n  public mouseMove(\n    { screenX, screenY }: MouseEvent,\n    draggableElement: ElementRef<HTMLElement>,\n    data$: Observable<FlatTreeItem[]>\n  ): void {\n    if (isNil(this.mouseDownPosition)) {\n      return;\n    }\n\n    this.draggingHasStarted$.pipe(take(1)).subscribe((draggingHasStarted: boolean) => {\n      const dragDistanceSqr: number =\n        Math.pow(this.mouseDownPosition.left - screenX, 2) + Math.pow(this.mouseDownPosition.top - screenY, 2);\n\n      const druggingMustBeStarted: boolean = dragDistanceSqr > this.draggableElementBoundingBox?.height / 2;\n      if (!draggingHasStarted && druggingMustBeStarted) {\n        this.startDragging(draggableElement, data$);\n        this.draggingHasStarted$.next(true);\n        this.updateDraggablePosition(screenX, screenY, draggableElement);\n      }\n\n      if (draggingHasStarted) {\n        this.updateDraggablePosition(screenX, screenY, draggableElement);\n      }\n    });\n  }\n\n  public mouseUp(): void {\n    this.draggingHasStarted$\n      .pipe(take(1), withLatestFrom(this.draggableNode$))\n      .subscribe(([draggingHasStarted, draggableNode]: [boolean, FlatTreeItem]) => {\n        if (draggingHasStarted && !isNil(this.dropNode)) {\n          this.droppedSubject$.next({\n            draggedElement: draggableNode,\n            droppedElement: this.dropNode,\n          });\n        }\n\n        this.draggingHasStarted$.next(false);\n        this.draggableNode$.next(null);\n        this.dropNode = null;\n        this.mouseDownPosition = null;\n        this.draggableElementBoundingBox = null;\n        this.scrollDirection$.next(null);\n        this.draggableExpandableDescendants = [];\n      });\n  }\n\n  public mouseEnter(node: FlatTreeItem): void {\n    this.draggingHasStarted$.pipe(take(1)).subscribe((draggingHasStarted: boolean) => {\n      if (!draggingHasStarted) {\n        return;\n      }\n\n      if (!node.isElement) {\n        this.dropNode = node;\n      }\n\n      if (this.canDrop(node)) {\n        this.expandNodeWithDelay$.next(node);\n      }\n    });\n  }\n\n  public canDrop(node: FlatTreeItem): boolean {\n    if (isNil(node)) {\n      return false;\n    }\n    return node.isExpandable && !this.draggableExpandableDescendants.includes(node.id);\n  }\n\n  public mouseLeave(): void {\n    this.draggingHasStarted$.pipe(take(1)).subscribe((draggingHasStarted: boolean) => {\n      if (!draggingHasStarted) {\n        return;\n      }\n\n      this.dropNode = null;\n      this.expandNodeWithDelay$.next(null);\n    });\n  }\n\n  private startDragging(draggableElement: ElementRef<HTMLElement>, data$: Observable<FlatTreeItem[]>): void {\n    this.setupWidthForDraggableElement(draggableElement);\n    this.setupDraggableExpandableDescendants(data$);\n  }\n\n  private setupWidthForDraggableElement(draggableElement: ElementRef<HTMLElement>): void {\n    timer(0)\n      .pipe(take(1))\n      .subscribe(() => {\n        this.renderer.setStyle(draggableElement.nativeElement, 'width', `${this.draggableElementBoundingBox.width}px`);\n      });\n  }\n\n  private setupDraggableExpandableDescendants(data$: Observable<FlatTreeItem[]>): void {\n    data$\n      .pipe(take(1), withLatestFrom(this.draggableNode$))\n      .subscribe(([treeItems, draggableNode]: [FlatTreeItem[], FlatTreeItem]) => {\n        const targetLevel: number = draggableNode?.level ?? 0;\n\n        let currentIndex: number =\n          treeItems.findIndex((dataPoint: FlatTreeItem) => dataPoint.id === draggableNode?.id) + 1;\n        const endOfListNotReached = (): boolean => treeItems.length !== currentIndex;\n        const targetLevelNotReached = (): boolean => treeItems[currentIndex].level !== targetLevel;\n        const result: Uuid[] = [draggableNode?.id];\n\n        while (endOfListNotReached() && targetLevelNotReached()) {\n          const currentNode: FlatTreeItem = treeItems[currentIndex];\n          if (currentNode.isExpandable) {\n            result.push(currentNode.id);\n          }\n          currentIndex++;\n        }\n\n        this.draggableExpandableDescendants = result;\n      });\n  }\n\n  private updateDraggablePosition(screenX: number, screenY: number, draggableElement: ElementRef<HTMLElement>): void {\n    const draggableElementPositionShift: Position = {\n      left: this.mouseDownPosition.left - this.draggableElementBoundingBox.left,\n      top: this.mouseDownPosition.top - this.draggableElementBoundingBox.top,\n    };\n\n    const bottomBorderPositionY: number =\n      this.host.nativeElement.clientHeight - this.draggableElementBoundingBox.height;\n    const draggableElementPosition: Position = {\n      left: screenX - this.draggableElementBoundingBox.left - draggableElementPositionShift.left,\n      top: getClampedValue(screenY - draggableElementPositionShift.top, 0, bottomBorderPositionY),\n    };\n\n    const isTopBorderReached: boolean = draggableElementPosition.top <= this.draggableElementBoundingBox.height;\n    const isBottomBorderReached: boolean = draggableElementPosition.top >= bottomBorderPositionY;\n\n    this.scrollDirection$.next(isTopBorderReached ? 'up' : isBottomBorderReached ? 'down' : null);\n\n    if (!isNil(draggableElement)) {\n      this.renderer.setStyle(draggableElement.nativeElement, 'left', `${draggableElementPosition.left}px`);\n      this.renderer.setStyle(draggableElement.nativeElement, 'top', `${draggableElementPosition.top}px`);\n    }\n  }\n}\n"]}