@nebular/theme
Version:
@nebular/theme
71 lines • 2.41 kB
JavaScript
import { Injectable, IterableDiffers } from '@angular/core';
import { merge, Subject } from 'rxjs';
export class NbColumnsService {
constructor(differs) {
this.differs = differs;
this.columnHide$ = new Subject();
this.columnShow$ = new Subject();
}
setColumns(columns) {
if (!this.changesDiffer) {
this.changesDiffer = this.differs.find(columns || []).create();
}
if (this.changesDiffer.diff(columns)) {
this.allColumns = Array.from(columns);
this.visibleColumns = Array.from(columns);
}
}
getVisibleColumns() {
return this.visibleColumns;
}
hideColumn(column) {
const toRemove = this.visibleColumns.indexOf(column);
if (toRemove > -1) {
this.visibleColumns.splice(toRemove, 1);
this.columnHide$.next();
}
}
showColumn(column) {
if (this.visibleColumns.includes(column)) {
return;
}
this.visibleColumns.splice(this.findInsertIndex(column), 0, column);
this.columnShow$.next();
}
onColumnsChange() {
return merge(this.columnShow$, this.columnHide$);
}
findInsertIndex(column) {
const initialIndex = this.allColumns.indexOf(column);
if (initialIndex === 0 || !this.visibleColumns.length) {
return 0;
}
if (initialIndex === this.allColumns.length - 1) {
return this.visibleColumns.length;
}
const leftSiblingIndex = initialIndex - 1;
for (let i = leftSiblingIndex; i >= 0; i--) {
const leftSibling = this.allColumns[i];
const index = this.visibleColumns.indexOf(leftSibling);
if (index !== -1) {
return index + 1;
}
}
const rightSiblingIndex = initialIndex + 1;
for (let i = rightSiblingIndex; i < this.allColumns.length; i++) {
const rightSibling = this.allColumns[i];
const index = this.visibleColumns.indexOf(rightSibling);
if (index !== -1) {
return index;
}
}
throw new Error(`Can't restore column position.`);
}
}
NbColumnsService.decorators = [
{ type: Injectable }
];
NbColumnsService.ctorParameters = () => [
{ type: IterableDiffers }
];
//# sourceMappingURL=tree-grid-columns.service.js.map