@odymaui/angular-tree-component
Version:
A simple yet powerful tree component for Angular16. WARNING: This is an unsupported fork for use in a dependent project to upgrade it to Angular 16. Unit tests pass and the example-app works as expected.
178 lines • 25.4 kB
JavaScript
import { Injectable } from '@angular/core';
import { observable, computed, action, autorun, reaction, makeObservable } from 'mobx';
import { TREE_EVENTS } from '../constants/events';
import * as i0 from "@angular/core";
import * as i1 from "./tree.model";
const Y_OFFSET = 500; // Extra pixels outside the viewport, in each direction, to render nodes in
const Y_EPSILON = 150; // Minimum pixel change required to recalculate the rendered nodes
export class TreeVirtualScroll {
treeModel;
_dispose;
yBlocks = 0;
x = 0;
viewportHeight = null;
viewport = null;
get y() {
return this.yBlocks * Y_EPSILON;
}
get totalHeight() {
return this.treeModel.virtualRoot ? this.treeModel.virtualRoot.height : 0;
}
constructor(treeModel) {
this.treeModel = treeModel;
makeObservable(this, {
yBlocks: observable,
x: observable,
viewportHeight: observable,
y: computed,
totalHeight: computed,
_setYBlocks: action,
recalcPositions: action,
setViewport: action,
scrollIntoView: action,
});
treeModel.virtualScroll = this;
this._dispose = [autorun(() => this.fixScroll())];
}
fireEvent(event) {
this.treeModel.fireEvent(event);
}
init() {
const fn = this.recalcPositions.bind(this);
fn();
this._dispose = [
...this._dispose,
reaction(() => this.treeModel.roots, fn),
reaction(() => this.treeModel.expandedNodeIds, fn),
reaction(() => this.treeModel.hiddenNodeIds, fn)
];
this.treeModel.subscribe(TREE_EVENTS.loadNodeChildren, fn);
}
isEnabled() {
return this.treeModel.options.useVirtualScroll;
}
//was private, public for now so makeObservable to work and deal as a todo
_setYBlocks(value) {
this.yBlocks = value;
}
recalcPositions() {
this.treeModel.virtualRoot.height = this._getPositionAfter(this.treeModel.getVisibleRoots(), 0);
}
_getPositionAfter(nodes, startPos) {
let position = startPos;
nodes.forEach((node) => {
node.position = position;
position = this._getPositionAfterNode(node, position);
});
return position;
}
_getPositionAfterNode(node, startPos) {
let position = node.getSelfHeight() + startPos;
if (node.children && node.isExpanded) { // TBD: consider loading component as well
position = this._getPositionAfter(node.visibleChildren, position);
}
node.height = position - startPos;
return position;
}
clear() {
this._dispose.forEach((d) => d());
}
setViewport(viewport) {
Object.assign(this, {
viewport,
x: viewport.scrollLeft,
yBlocks: Math.round(viewport.scrollTop / Y_EPSILON),
viewportHeight: viewport.getBoundingClientRect ? viewport.getBoundingClientRect().height : 0
});
}
scrollIntoView(node, force, scrollToMiddle = true) {
if (node.options.scrollContainer) {
const scrollContainer = node.options.scrollContainer;
const scrollContainerHeight = scrollContainer.getBoundingClientRect().height;
const scrollContainerTop = scrollContainer.getBoundingClientRect().top;
const nodeTop = this.viewport.getBoundingClientRect().top + node.position - scrollContainerTop;
if (force || // force scroll to node
nodeTop < scrollContainer.scrollTop || // node is above scroll container
nodeTop + node.getSelfHeight() > scrollContainer.scrollTop + scrollContainerHeight) { // node is below container
scrollContainer.scrollTop = scrollToMiddle ?
nodeTop - scrollContainerHeight / 2 : // scroll to middle
nodeTop; // scroll to start
}
}
else {
if (force || // force scroll to node
node.position < this.y || // node is above viewport
node.position + node.getSelfHeight() > this.y + this.viewportHeight) { // node is below viewport
if (this.viewport) {
this.viewport.scrollTop = scrollToMiddle ?
node.position - this.viewportHeight / 2 : // scroll to middle
node.position; // scroll to start
this._setYBlocks(Math.floor(this.viewport.scrollTop / Y_EPSILON));
}
}
}
}
getViewportNodes(nodes) {
if (!nodes)
return [];
const visibleNodes = nodes.filter((node) => !node.isHidden);
if (!this.isEnabled())
return visibleNodes;
if (!this.viewportHeight || !visibleNodes.length)
return [];
// When loading children async this method is called before their height and position is calculated.
// In that case firstIndex === 0 and lastIndex === visibleNodes.length - 1 (e.g. 1000),
// which means that it loops through every visibleNodes item and push them into viewportNodes array.
// We can prevent nodes from being pushed to the array and wait for the appropriate calculations to take place
const lastVisibleNode = visibleNodes.slice(-1)[0];
if (!lastVisibleNode.height && lastVisibleNode.position === 0)
return [];
// Search for first node in the viewport using binary search
// Look for first node that starts after the beginning of the viewport (with buffer)
// Or that ends after the beginning of the viewport
const firstIndex = binarySearch(visibleNodes, (node) => {
return (node.position + Y_OFFSET > this.y) ||
(node.position + node.height > this.y);
});
// Search for last node in the viewport using binary search
// Look for first node that starts after the end of the viewport (with buffer)
const lastIndex = binarySearch(visibleNodes, (node) => {
return node.position - Y_OFFSET > this.y + this.viewportHeight;
}, firstIndex);
const viewportNodes = [];
for (let i = firstIndex; i <= lastIndex; i++) {
viewportNodes.push(visibleNodes[i]);
}
return viewportNodes;
}
fixScroll() {
const maxY = Math.max(0, this.totalHeight - this.viewportHeight);
if (this.y < 0)
this._setYBlocks(0);
if (this.y > maxY)
this._setYBlocks(maxY / Y_EPSILON);
}
/** @nocollapse */ static ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.1.2", ngImport: i0, type: TreeVirtualScroll, deps: [{ token: i1.TreeModel }], target: i0.ɵɵFactoryTarget.Injectable });
/** @nocollapse */ static ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "16.1.2", ngImport: i0, type: TreeVirtualScroll });
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.1.2", ngImport: i0, type: TreeVirtualScroll, decorators: [{
type: Injectable
}], ctorParameters: function () { return [{ type: i1.TreeModel }]; } });
function binarySearch(nodes, condition, firstIndex = 0) {
let index = firstIndex;
let toIndex = nodes.length - 1;
while (index !== toIndex) {
let midIndex = Math.floor((index + toIndex) / 2);
if (condition(nodes[midIndex])) {
toIndex = midIndex;
}
else {
if (index === midIndex)
index = toIndex;
else
index = midIndex;
}
}
return index;
}
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{ Injectable } from '@angular/core';\r\nimport { observable, computed, action, autorun, reaction, makeObservable } from 'mobx';\r\nimport { TreeModel } from './tree.model';\r\nimport { TREE_EVENTS } from '../constants/events';\r\n\r\nconst Y_OFFSET = 500; // Extra pixels outside the viewport, in each direction, to render nodes in\r\nconst Y_EPSILON = 150; // Minimum pixel change required to recalculate the rendered nodes\r\n\r\n@Injectable()\r\nexport class TreeVirtualScroll {\r\n  private _dispose: any;\r\n\r\n  yBlocks = 0;\r\n  x = 0;\r\n  viewportHeight = null;\r\n  viewport = null;\r\n\r\n  get y() {\r\n    return this.yBlocks * Y_EPSILON;\r\n  }\r\n\r\n  get totalHeight() {\r\n    return this.treeModel.virtualRoot ? this.treeModel.virtualRoot.height : 0;\r\n  }\r\n\r\n  constructor(private treeModel: TreeModel) {\r\n    makeObservable(this,{\r\n      yBlocks: observable,\r\n      x: observable,\r\n      viewportHeight: observable,\r\n      y: computed,\r\n      totalHeight: computed,\r\n      _setYBlocks: action,\r\n      recalcPositions: action,\r\n      setViewport: action,\r\n      scrollIntoView: action,\r\n    });\r\n    treeModel.virtualScroll = this;\r\n    this._dispose = [autorun(() => this.fixScroll())];\r\n  }\r\n\r\n  fireEvent(event) {\r\n    this.treeModel.fireEvent(event);\r\n  }\r\n\r\n  init() {\r\n    const fn = this.recalcPositions.bind(this);\r\n\r\n    fn();\r\n    this._dispose = [\r\n      ...this._dispose,\r\n      reaction(() => this.treeModel.roots, fn),\r\n      reaction(() => this.treeModel.expandedNodeIds, fn),\r\n      reaction(() => this.treeModel.hiddenNodeIds, fn)\r\n    ];\r\n    this.treeModel.subscribe(TREE_EVENTS.loadNodeChildren, fn);\r\n  }\r\n\r\n  isEnabled() {\r\n    return this.treeModel.options.useVirtualScroll;\r\n  }\r\n\r\n  //was private, public for now so makeObservable to work and deal as a todo\r\n  _setYBlocks(value) {\r\n    this.yBlocks = value;\r\n  }\r\n\r\n  recalcPositions() {\r\n    this.treeModel.virtualRoot.height = this._getPositionAfter(this.treeModel.getVisibleRoots(), 0);\r\n  }\r\n\r\n  private _getPositionAfter(nodes, startPos) {\r\n    let position = startPos;\r\n\r\n    nodes.forEach((node) => {\r\n      node.position = position;\r\n      position = this._getPositionAfterNode(node, position);\r\n    });\r\n    return position;\r\n  }\r\n\r\n  private _getPositionAfterNode(node, startPos) {\r\n    let position = node.getSelfHeight() + startPos;\r\n\r\n    if (node.children && node.isExpanded) { // TBD: consider loading component as well\r\n      position = this._getPositionAfter(node.visibleChildren, position);\r\n    }\r\n    node.height = position - startPos;\r\n    return position;\r\n  }\r\n\r\n\r\n  clear() {\r\n    this._dispose.forEach((d) => d());\r\n  }\r\n\r\n  setViewport(viewport) {\r\n    Object.assign(this, {\r\n      viewport,\r\n      x: viewport.scrollLeft,\r\n      yBlocks: Math.round(viewport.scrollTop / Y_EPSILON),\r\n      viewportHeight: viewport.getBoundingClientRect ? viewport.getBoundingClientRect().height : 0\r\n    });\r\n  }\r\n\r\n  scrollIntoView(node, force, scrollToMiddle = true) {\r\n    if (node.options.scrollContainer) {\r\n      const scrollContainer = node.options.scrollContainer;\r\n      const scrollContainerHeight = scrollContainer.getBoundingClientRect().height;\r\n      const scrollContainerTop = scrollContainer.getBoundingClientRect().top;\r\n      const nodeTop = this.viewport.getBoundingClientRect().top + node.position - scrollContainerTop;\r\n\r\n      if (force || // force scroll to node\r\n        nodeTop < scrollContainer.scrollTop || // node is above scroll container\r\n        nodeTop + node.getSelfHeight() > scrollContainer.scrollTop + scrollContainerHeight) { // node is below container\r\n        scrollContainer.scrollTop = scrollToMiddle ?\r\n          nodeTop - scrollContainerHeight / 2 : // scroll to middle\r\n          nodeTop; // scroll to start\r\n      }\r\n    } else {\r\n      if (force || // force scroll to node\r\n        node.position < this.y || // node is above viewport\r\n        node.position + node.getSelfHeight() > this.y + this.viewportHeight) { // node is below viewport\r\n        if (this.viewport) {\r\n          this.viewport.scrollTop = scrollToMiddle ?\r\n          node.position - this.viewportHeight / 2 : // scroll to middle\r\n          node.position; // scroll to start\r\n\r\n          this._setYBlocks(Math.floor(this.viewport.scrollTop / Y_EPSILON));\r\n        }\r\n      }\r\n    }\r\n  }\r\n\r\n  getViewportNodes(nodes) {\r\n    if (!nodes) return [];\r\n\r\n    const visibleNodes = nodes.filter((node) => !node.isHidden);\r\n\r\n    if (!this.isEnabled()) return visibleNodes;\r\n\r\n    if (!this.viewportHeight || !visibleNodes.length) return [];\r\n\r\n    // When loading children async this method is called before their height and position is calculated.\r\n    // In that case firstIndex === 0 and lastIndex === visibleNodes.length - 1 (e.g. 1000),\r\n    // which means that it loops through every visibleNodes item and push them into viewportNodes array.\r\n    // We can prevent nodes from being pushed to the array and wait for the appropriate calculations to take place\r\n    const lastVisibleNode = visibleNodes.slice(-1)[0]\r\n    if (!lastVisibleNode.height && lastVisibleNode.position === 0) return [];\r\n\r\n    // Search for first node in the viewport using binary search\r\n    // Look for first node that starts after the beginning of the viewport (with buffer)\r\n    // Or that ends after the beginning of the viewport\r\n    const firstIndex = binarySearch(visibleNodes, (node) => {\r\n      return (node.position + Y_OFFSET > this.y) ||\r\n             (node.position + node.height > this.y);\r\n    });\r\n\r\n    // Search for last node in the viewport using binary search\r\n    // Look for first node that starts after the end of the viewport (with buffer)\r\n    const lastIndex = binarySearch(visibleNodes, (node) => {\r\n      return node.position - Y_OFFSET > this.y + this.viewportHeight;\r\n    }, firstIndex);\r\n\r\n    const viewportNodes = [];\r\n\r\n    for (let i = firstIndex; i <= lastIndex; i++) {\r\n      viewportNodes.push(visibleNodes[i]);\r\n    }\r\n\r\n    return viewportNodes;\r\n  }\r\n\r\n  fixScroll() {\r\n    const maxY = Math.max(0, this.totalHeight - this.viewportHeight);\r\n\r\n    if (this.y < 0) this._setYBlocks(0);\r\n    if (this.y > maxY) this._setYBlocks(maxY / Y_EPSILON);\r\n  }\r\n}\r\n\r\nfunction binarySearch(nodes, condition, firstIndex = 0) {\r\n  let index = firstIndex;\r\n  let toIndex = nodes.length - 1;\r\n\r\n  while (index !== toIndex) {\r\n    let midIndex = Math.floor((index + toIndex) / 2);\r\n\r\n    if (condition(nodes[midIndex])) {\r\n      toIndex = midIndex;\r\n    }\r\n    else {\r\n      if (index === midIndex) index = toIndex;\r\n      else index = midIndex;\r\n    }\r\n  }\r\n  return index;\r\n}\r\n"]}