@circlon/angular-tree-component
Version:
A simple yet powerful tree component for Angular
423 lines • 45.9 kB
JavaScript
var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
return c > 3 && r && Object.defineProperty(target, key, r), r;
};
var __metadata = (this && this.__metadata) || function (k, v) {
if (typeof Reflect === "object" && typeof Reflect.metadata === "function") return Reflect.metadata(k, v);
};
import { observable, computed, reaction, action } from 'mobx';
import { TREE_EVENTS } from '../constants/events';
export class TreeNode {
constructor(data, parent, treeModel, index) {
this.data = data;
this.parent = parent;
this.treeModel = treeModel;
this.position = 0;
this.allowDrop = (element, $event) => {
return this.options.allowDrop(element, { parent: this, index: 0 }, $event);
};
this.allowDragoverStyling = () => {
return this.options.allowDragoverStyling;
};
if (this.id === undefined || this.id === null) {
this.id = uuid();
} // Make sure there's a unique id without overriding existing ids to work with immutable data structures
this.index = index;
if (this.getField('children')) {
this._initChildren();
}
this.autoLoadChildren();
}
get isHidden() { return this.treeModel.isHidden(this); }
;
get isExpanded() { return this.treeModel.isExpanded(this); }
;
get isActive() { return this.treeModel.isActive(this); }
;
get isFocused() { return this.treeModel.isNodeFocused(this); }
;
get isSelected() {
if (this.isSelectable()) {
return this.treeModel.isSelected(this);
}
else {
return this.children.some((node) => node.isSelected);
}
}
;
get isAllSelected() {
if (this.isSelectable()) {
return this.treeModel.isSelected(this);
}
else {
return this.children.every((node) => node.isAllSelected);
}
}
;
get isPartiallySelected() {
return this.isSelected && !this.isAllSelected;
}
get level() {
return this.parent ? this.parent.level + 1 : 0;
}
get path() {
return this.parent ? [...this.parent.path, this.id] : [];
}
get elementRef() {
throw `Element Ref is no longer supported since introducing virtual scroll\n
You may use a template to obtain a reference to the element`;
}
get originalNode() { return this._originalNode; }
;
// helper get functions:
get hasChildren() {
return !!(this.getField('hasChildren') || (this.children && this.children.length > 0));
}
get isCollapsed() { return !this.isExpanded; }
get isLeaf() { return !this.hasChildren; }
get isRoot() { return this.parent.data.virtual; }
get realParent() { return this.isRoot ? null : this.parent; }
// proxy functions:
get options() { return this.treeModel.options; }
fireEvent(event) { this.treeModel.fireEvent(event); }
// field accessors:
get displayField() {
return this.getField('display');
}
get id() {
return this.getField('id');
}
set id(value) {
this.setField('id', value);
}
getField(key) {
return this.data[this.options[`${key}Field`]];
}
setField(key, value) {
this.data[this.options[`${key}Field`]] = value;
}
// traversing:
_findAdjacentSibling(steps, skipHidden = false) {
const siblings = this._getParentsChildren(skipHidden);
const index = siblings.indexOf(this);
return siblings.length > index + steps ? siblings[index + steps] : null;
}
findNextSibling(skipHidden = false) {
return this._findAdjacentSibling(+1, skipHidden);
}
findPreviousSibling(skipHidden = false) {
return this._findAdjacentSibling(-1, skipHidden);
}
getVisibleChildren() {
return this.visibleChildren;
}
get visibleChildren() {
return (this.children || []).filter((node) => !node.isHidden);
}
getFirstChild(skipHidden = false) {
let children = skipHidden ? this.visibleChildren : this.children;
return children != null && children.length ? children[0] : null;
}
getLastChild(skipHidden = false) {
let children = skipHidden ? this.visibleChildren : this.children;
return children != null && children.length ? children[children.length - 1] : null;
}
findNextNode(goInside = true, skipHidden = false) {
return goInside && this.isExpanded && this.getFirstChild(skipHidden) ||
this.findNextSibling(skipHidden) ||
this.parent && this.parent.findNextNode(false, skipHidden);
}
findPreviousNode(skipHidden = false) {
let previousSibling = this.findPreviousSibling(skipHidden);
if (!previousSibling) {
return this.realParent;
}
return previousSibling._getLastOpenDescendant(skipHidden);
}
_getLastOpenDescendant(skipHidden = false) {
const lastChild = this.getLastChild(skipHidden);
return (this.isCollapsed || !lastChild)
? this
: lastChild._getLastOpenDescendant(skipHidden);
}
_getParentsChildren(skipHidden = false) {
const children = this.parent &&
(skipHidden ? this.parent.getVisibleChildren() : this.parent.children);
return children || [];
}
getIndexInParent(skipHidden = false) {
return this._getParentsChildren(skipHidden).indexOf(this);
}
isDescendantOf(node) {
if (this === node)
return true;
else
return this.parent && this.parent.isDescendantOf(node);
}
getNodePadding() {
return this.options.levelPadding * (this.level - 1) + 'px';
}
getClass() {
return [this.options.nodeClass(this), `tree-node-level-${this.level}`].join(' ');
}
onDrop($event) {
this.mouseAction('drop', $event.event, {
from: $event.element,
to: { parent: this, index: 0, dropOnNode: true }
});
}
allowDrag() {
return this.options.allowDrag(this);
}
// helper methods:
loadNodeChildren() {
if (!this.options.getChildren) {
return Promise.resolve(); // Not getChildren method - for using redux
}
return Promise.resolve(this.options.getChildren(this))
.then((children) => {
if (children) {
this.setField('children', children);
this._initChildren();
if (this.options.useTriState && this.treeModel.isSelected(this)) {
this.setIsSelected(true);
}
this.children.forEach((child) => {
if (child.getField('isExpanded') && child.hasChildren) {
child.expand();
}
});
}
}).then(() => {
this.fireEvent({
eventName: TREE_EVENTS.loadNodeChildren,
node: this
});
});
}
expand() {
if (!this.isExpanded) {
this.toggleExpanded();
}
return this;
}
collapse() {
if (this.isExpanded) {
this.toggleExpanded();
}
return this;
}
doForAll(fn) {
Promise.resolve(fn(this)).then(() => {
if (this.children) {
this.children.forEach((child) => child.doForAll(fn));
}
});
}
expandAll() {
this.doForAll((node) => node.expand());
}
collapseAll() {
this.doForAll((node) => node.collapse());
}
ensureVisible() {
if (this.realParent) {
this.realParent.expand();
this.realParent.ensureVisible();
}
return this;
}
toggleExpanded() {
this.setIsExpanded(!this.isExpanded);
return this;
}
setIsExpanded(value) {
if (this.hasChildren) {
this.treeModel.setExpandedNode(this, value);
}
return this;
}
;
autoLoadChildren() {
this.handler =
reaction(() => this.isExpanded, (isExpanded) => {
if (!this.children && this.hasChildren && isExpanded) {
this.loadNodeChildren();
}
}, { fireImmediately: true });
}
dispose() {
if (this.children) {
this.children.forEach((child) => child.dispose());
}
if (this.handler) {
this.handler();
}
this.parent = null;
this.children = null;
}
setIsActive(value, multi = false) {
this.treeModel.setActiveNode(this, value, multi);
if (value) {
this.focus(this.options.scrollOnActivate);
}
return this;
}
isSelectable() {
return this.isLeaf || !this.children || !this.options.useTriState;
}
setIsSelected(value) {
if (this.isSelectable()) {
this.treeModel.setSelectedNode(this, value);
}
else {
this.visibleChildren.forEach((child) => child.setIsSelected(value));
}
return this;
}
toggleSelected() {
this.setIsSelected(!this.isSelected);
return this;
}
toggleActivated(multi = false) {
this.setIsActive(!this.isActive, multi);
return this;
}
setActiveAndVisible(multi = false) {
this.setIsActive(true, multi)
.ensureVisible();
setTimeout(this.scrollIntoView.bind(this));
return this;
}
scrollIntoView(force = false) {
this.treeModel.virtualScroll.scrollIntoView(this, force);
}
focus(scroll = true) {
let previousNode = this.treeModel.getFocusedNode();
this.treeModel.setFocusedNode(this);
if (scroll) {
this.scrollIntoView();
}
if (previousNode) {
this.fireEvent({ eventName: TREE_EVENTS.blur, node: previousNode });
}
this.fireEvent({ eventName: TREE_EVENTS.focus, node: this });
return this;
}
blur() {
let previousNode = this.treeModel.getFocusedNode();
this.treeModel.setFocusedNode(null);
if (previousNode) {
this.fireEvent({ eventName: TREE_EVENTS.blur, node: this });
}
return this;
}
setIsHidden(value) {
this.treeModel.setIsHidden(this, value);
}
hide() {
this.setIsHidden(true);
}
show() {
this.setIsHidden(false);
}
mouseAction(actionName, $event, data = null) {
this.treeModel.setFocus(true);
const actionMapping = this.options.actionMapping.mouse;
const mouseAction = actionMapping[actionName];
if (mouseAction) {
mouseAction(this.treeModel, this, $event, data);
}
}
getSelfHeight() {
return this.options.nodeHeight(this);
}
_initChildren() {
this.children = this.getField('children')
.map((c, index) => new TreeNode(c, this, this.treeModel, index));
}
}
__decorate([
computed,
__metadata("design:type", Object),
__metadata("design:paramtypes", [])
], TreeNode.prototype, "isHidden", null);
__decorate([
computed,
__metadata("design:type", Object),
__metadata("design:paramtypes", [])
], TreeNode.prototype, "isExpanded", null);
__decorate([
computed,
__metadata("design:type", Object),
__metadata("design:paramtypes", [])
], TreeNode.prototype, "isActive", null);
__decorate([
computed,
__metadata("design:type", Object),
__metadata("design:paramtypes", [])
], TreeNode.prototype, "isFocused", null);
__decorate([
computed,
__metadata("design:type", Object),
__metadata("design:paramtypes", [])
], TreeNode.prototype, "isSelected", null);
__decorate([
computed,
__metadata("design:type", Object),
__metadata("design:paramtypes", [])
], TreeNode.prototype, "isAllSelected", null);
__decorate([
computed,
__metadata("design:type", Object),
__metadata("design:paramtypes", [])
], TreeNode.prototype, "isPartiallySelected", null);
__decorate([
observable,
__metadata("design:type", Array)
], TreeNode.prototype, "children", void 0);
__decorate([
observable,
__metadata("design:type", Number)
], TreeNode.prototype, "index", void 0);
__decorate([
observable,
__metadata("design:type", Object)
], TreeNode.prototype, "position", void 0);
__decorate([
observable,
__metadata("design:type", Number)
], TreeNode.prototype, "height", void 0);
__decorate([
computed,
__metadata("design:type", Number),
__metadata("design:paramtypes", [])
], TreeNode.prototype, "level", null);
__decorate([
computed,
__metadata("design:type", Array),
__metadata("design:paramtypes", [])
], TreeNode.prototype, "path", null);
__decorate([
computed,
__metadata("design:type", Object),
__metadata("design:paramtypes", [])
], TreeNode.prototype, "visibleChildren", null);
__decorate([
action,
__metadata("design:type", Function),
__metadata("design:paramtypes", [Object]),
__metadata("design:returntype", void 0)
], TreeNode.prototype, "setIsSelected", null);
__decorate([
action,
__metadata("design:type", Function),
__metadata("design:paramtypes", []),
__metadata("design:returntype", void 0)
], TreeNode.prototype, "_initChildren", null);
function uuid() {
return Math.floor(Math.random() * 10000000000000);
}
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{ observable, computed, reaction, autorun, action, IReactionDisposer } from 'mobx';\r\nimport { TreeModel } from './tree.model';\r\nimport { TreeOptions } from './tree-options.model';\r\nimport { ITreeNode } from '../defs/api';\r\nimport { TREE_EVENTS } from '../constants/events';\r\n\r\nexport class TreeNode implements ITreeNode {\r\n  private handler: IReactionDisposer;\r\n  @computed get isHidden() { return this.treeModel.isHidden(this); };\r\n  @computed get isExpanded() { return this.treeModel.isExpanded(this); };\r\n  @computed get isActive() { return this.treeModel.isActive(this); };\r\n  @computed get isFocused() { return this.treeModel.isNodeFocused(this); };\r\n  @computed get isSelected() {\r\n    if (this.isSelectable()) {\r\n        return this.treeModel.isSelected(this);\r\n    } else {\r\n      return this.children.some((node: TreeNode) => node.isSelected);\r\n    }\r\n  };\r\n  @computed get isAllSelected() {\r\n    if (this.isSelectable()) {\r\n      return this.treeModel.isSelected(this);\r\n    } else {\r\n      return this.children.every((node: TreeNode) => node.isAllSelected);\r\n    }\r\n  };\r\n  @computed get isPartiallySelected() {\r\n    return this.isSelected && !this.isAllSelected;\r\n  }\r\n\r\n  @observable children: TreeNode[];\r\n  @observable index: number;\r\n  @observable position = 0;\r\n  @observable height: number;\r\n  @computed get level(): number {\r\n    return this.parent ? this.parent.level + 1 : 0;\r\n  }\r\n  @computed get path(): string[] {\r\n    return this.parent ? [...this.parent.path, this.id] : [];\r\n  }\r\n\r\n  get elementRef(): any {\r\n    throw `Element Ref is no longer supported since introducing virtual scroll\\n\r\n      You may use a template to obtain a reference to the element`;\r\n  }\r\n\r\n  private _originalNode: any;\r\n  get originalNode() { return this._originalNode; };\r\n\r\n  constructor(public data: any, public parent: TreeNode, public treeModel: TreeModel, index: number) {\r\n    if (this.id === undefined || this.id === null) {\r\n      this.id = uuid();\r\n    } // Make sure there's a unique id without overriding existing ids to work with immutable data structures\r\n    this.index = index;\r\n\r\n    if (this.getField('children')) {\r\n      this._initChildren();\r\n    }\r\n    this.autoLoadChildren();\r\n  }\r\n\r\n  // helper get functions:\r\n  get hasChildren(): boolean {\r\n    return !!(this.getField('hasChildren') || (this.children && this.children.length > 0));\r\n  }\r\n  get isCollapsed(): boolean { return !this.isExpanded; }\r\n  get isLeaf(): boolean { return !this.hasChildren; }\r\n  get isRoot(): boolean { return this.parent.data.virtual; }\r\n  get realParent(): TreeNode { return this.isRoot ? null : this.parent; }\r\n\r\n  // proxy functions:\r\n  get options(): TreeOptions { return this.treeModel.options; }\r\n  fireEvent(event) { this.treeModel.fireEvent(event); }\r\n\r\n  // field accessors:\r\n  get displayField() {\r\n    return this.getField('display');\r\n  }\r\n\r\n  get id() {\r\n    return this.getField('id');\r\n  }\r\n\r\n  set id(value) {\r\n    this.setField('id', value);\r\n  }\r\n\r\n  getField(key) {\r\n    return this.data[this.options[`${key}Field`]];\r\n  }\r\n\r\n  setField(key, value) {\r\n    this.data[this.options[`${key}Field`]] = value;\r\n  }\r\n\r\n  // traversing:\r\n  _findAdjacentSibling(steps, skipHidden = false) {\r\n    const siblings = this._getParentsChildren(skipHidden);\r\n    const index = siblings.indexOf(this);\r\n\r\n    return siblings.length > index + steps ? siblings[index + steps] : null;\r\n  }\r\n\r\n  findNextSibling(skipHidden = false) {\r\n    return this._findAdjacentSibling(+1, skipHidden);\r\n  }\r\n\r\n  findPreviousSibling(skipHidden = false) {\r\n    return this._findAdjacentSibling(-1, skipHidden);\r\n  }\r\n\r\n  getVisibleChildren() {\r\n    return this.visibleChildren;\r\n  }\r\n\r\n  @computed get visibleChildren() {\r\n    return (this.children || []).filter((node) => !node.isHidden);\r\n  }\r\n\r\n  getFirstChild(skipHidden = false) {\r\n    let children = skipHidden ? this.visibleChildren : this.children;\r\n\r\n    return children != null && children.length ? children[0] : null;\r\n  }\r\n\r\n  getLastChild(skipHidden = false) {\r\n    let children = skipHidden ? this.visibleChildren : this.children;\r\n\r\n    return children != null && children.length ? children[children.length - 1] : null;\r\n  }\r\n\r\n  findNextNode(goInside = true, skipHidden = false) {\r\n    return goInside && this.isExpanded && this.getFirstChild(skipHidden) ||\r\n           this.findNextSibling(skipHidden) ||\r\n           this.parent && this.parent.findNextNode(false, skipHidden);\r\n  }\r\n\r\n  findPreviousNode(skipHidden = false) {\r\n    let previousSibling = this.findPreviousSibling(skipHidden);\r\n    if (!previousSibling) {\r\n      return this.realParent;\r\n    }\r\n    return previousSibling._getLastOpenDescendant(skipHidden);\r\n  }\r\n\r\n  _getLastOpenDescendant(skipHidden = false) {\r\n    const lastChild = this.getLastChild(skipHidden);\r\n    return (this.isCollapsed || !lastChild)\r\n      ? this\r\n      : lastChild._getLastOpenDescendant(skipHidden);\r\n  }\r\n\r\n  private _getParentsChildren(skipHidden = false): any[] {\r\n    const children = this.parent &&\r\n      (skipHidden ? this.parent.getVisibleChildren() : this.parent.children);\r\n\r\n    return children || [];\r\n  }\r\n\r\n  private getIndexInParent(skipHidden = false) {\r\n    return this._getParentsChildren(skipHidden).indexOf(this);\r\n  }\r\n\r\n  isDescendantOf(node: TreeNode) {\r\n    if (this === node) return true;\r\n    else return this.parent && this.parent.isDescendantOf(node);\r\n  }\r\n\r\n  getNodePadding(): string {\r\n    return this.options.levelPadding * (this.level - 1) + 'px';\r\n  }\r\n\r\n  getClass(): string {\r\n    return [this.options.nodeClass(this), `tree-node-level-${ this.level }`].join(' ');\r\n  }\r\n\r\n  onDrop($event) {\r\n    this.mouseAction('drop', $event.event, {\r\n      from: $event.element,\r\n      to: { parent: this, index: 0, dropOnNode: true }\r\n    });\r\n  }\r\n\r\n  allowDrop = (element, $event?) => {\r\n    return this.options.allowDrop(element, { parent: this, index: 0 }, $event);\r\n  }\r\n\r\n  allowDragoverStyling = () => {\r\n    return this.options.allowDragoverStyling;\r\n  }\r\n\r\n  allowDrag() {\r\n    return this.options.allowDrag(this);\r\n  }\r\n\r\n\r\n  // helper methods:\r\n  loadNodeChildren() {\r\n    if (!this.options.getChildren) {\r\n      return Promise.resolve(); // Not getChildren method - for using redux\r\n    }\r\n    return Promise.resolve(this.options.getChildren(this))\r\n      .then((children) => {\r\n        if (children) {\r\n          this.setField('children', children);\r\n          this._initChildren();\r\n          if (this.options.useTriState && this.treeModel.isSelected(this)) {\r\n            this.setIsSelected(true);\r\n          }\r\n          this.children.forEach((child) => {\r\n            if (child.getField('isExpanded') && child.hasChildren) {\r\n              child.expand();\r\n            }\r\n          });\r\n      }}).then(() => {\r\n        this.fireEvent({\r\n          eventName: TREE_EVENTS.loadNodeChildren,\r\n          node: this\r\n        });\r\n      });\r\n  }\r\n\r\n  expand() {\r\n    if (!this.isExpanded) {\r\n      this.toggleExpanded();\r\n    }\r\n\r\n    return this;\r\n  }\r\n\r\n  collapse() {\r\n    if (this.isExpanded) {\r\n      this.toggleExpanded();\r\n    }\r\n\r\n    return this;\r\n  }\r\n\r\n  doForAll(fn: (node: ITreeNode) => any) {\r\n    Promise.resolve(fn(this)).then(() => {\r\n      if (this.children) {\r\n        this.children.forEach((child) => child.doForAll(fn));\r\n      }\r\n    });\r\n  }\r\n\r\n  expandAll() {\r\n    this.doForAll((node) => node.expand());\r\n  }\r\n\r\n  collapseAll() {\r\n    this.doForAll((node) => node.collapse());\r\n  }\r\n\r\n  ensureVisible() {\r\n    if (this.realParent) {\r\n      this.realParent.expand();\r\n      this.realParent.ensureVisible();\r\n    }\r\n\r\n    return this;\r\n  }\r\n\r\n  toggleExpanded() {\r\n    this.setIsExpanded(!this.isExpanded);\r\n\r\n    return this;\r\n  }\r\n\r\n  setIsExpanded(value) {\r\n    if (this.hasChildren) {\r\n      this.treeModel.setExpandedNode(this, value);\r\n    }\r\n\r\n    return this;\r\n  };\r\n\r\n  autoLoadChildren() {\r\n    this.handler =\r\n      reaction(\r\n        () => this.isExpanded,\r\n        (isExpanded) => {\r\n          if (!this.children && this.hasChildren && isExpanded) {\r\n            this.loadNodeChildren();\r\n          }\r\n        },\r\n        { fireImmediately: true }\r\n      );\r\n  }\r\n\r\n  dispose() {\r\n    if (this.children) {\r\n      this.children.forEach((child) => child.dispose());\r\n    }\r\n    if (this.handler) {\r\n      this.handler();\r\n    }\r\n    this.parent = null;\r\n    this.children = null;\r\n  }\r\n\r\n  setIsActive(value, multi = false) {\r\n    this.treeModel.setActiveNode(this, value, multi);\r\n    if (value) {\r\n      this.focus(this.options.scrollOnActivate);\r\n    }\r\n\r\n    return this;\r\n  }\r\n\r\n  isSelectable() {\r\n    return this.isLeaf || !this.children || !this.options.useTriState;\r\n  }\r\n\r\n  @action setIsSelected(value) {\r\n    if (this.isSelectable()) {\r\n      this.treeModel.setSelectedNode(this, value);\r\n    } else {\r\n      this.visibleChildren.forEach((child) => child.setIsSelected(value));\r\n    }\r\n\r\n    return this;\r\n  }\r\n\r\n  toggleSelected() {\r\n    this.setIsSelected(!this.isSelected);\r\n\r\n    return this;\r\n  }\r\n\r\n  toggleActivated(multi = false) {\r\n    this.setIsActive(!this.isActive, multi);\r\n\r\n    return this;\r\n  }\r\n\r\n  setActiveAndVisible(multi = false) {\r\n    this.setIsActive(true, multi)\r\n      .ensureVisible();\r\n\r\n    setTimeout(this.scrollIntoView.bind(this));\r\n\r\n    return this;\r\n  }\r\n\r\n  scrollIntoView(force = false) {\r\n    this.treeModel.virtualScroll.scrollIntoView(this, force);\r\n  }\r\n\r\n  focus(scroll = true) {\r\n    let previousNode = this.treeModel.getFocusedNode();\r\n    this.treeModel.setFocusedNode(this);\r\n    if (scroll) {\r\n      this.scrollIntoView();\r\n    }\r\n    if (previousNode) {\r\n      this.fireEvent({ eventName: TREE_EVENTS.blur, node: previousNode });\r\n    }\r\n    this.fireEvent({ eventName: TREE_EVENTS.focus, node: this });\r\n\r\n    return this;\r\n  }\r\n\r\n  blur() {\r\n    let previousNode = this.treeModel.getFocusedNode();\r\n    this.treeModel.setFocusedNode(null);\r\n    if (previousNode) {\r\n      this.fireEvent({ eventName: TREE_EVENTS.blur, node: this });\r\n    }\r\n\r\n    return this;\r\n  }\r\n\r\n  setIsHidden(value) {\r\n    this.treeModel.setIsHidden(this, value);\r\n  }\r\n\r\n  hide() {\r\n    this.setIsHidden(true);\r\n  }\r\n\r\n  show() {\r\n    this.setIsHidden(false);\r\n  }\r\n\r\n  mouseAction(actionName: string, $event, data: any = null) {\r\n    this.treeModel.setFocus(true);\r\n\r\n    const actionMapping = this.options.actionMapping.mouse;\r\n    const mouseAction = actionMapping[actionName];\r\n\r\n    if (mouseAction) {\r\n      mouseAction(this.treeModel, this, $event, data);\r\n    }\r\n  }\r\n\r\n  getSelfHeight() {\r\n    return this.options.nodeHeight(this);\r\n  }\r\n\r\n  @action _initChildren() {\r\n    this.children = this.getField('children')\r\n      .map((c, index) => new TreeNode(c, this, this.treeModel, index));\r\n  }\r\n}\r\n\r\nfunction uuid() {\r\n  return Math.floor(Math.random() * 10000000000000);\r\n}\r\n"]}