ngx-bootstrap
Version:
Angular Bootstrap
52 lines • 1.85 kB
JavaScript
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
/* eslint-disable */
import { Injectable } from '@angular/core';
import * as i0 from "@angular/core";
/** Injectable that ensures only the most recently enabled FocusTrap is active. */
export class FocusTrapManager {
constructor() {
// A stack of the FocusTraps on the page. Only the FocusTrap at the
// top of the stack is active.
this._focusTrapStack = [];
}
/**
* Disables the FocusTrap at the top of the stack, and then pushes
* the new FocusTrap onto the stack.
*/
register(focusTrap) {
// Dedupe focusTraps that register multiple times.
this._focusTrapStack = this._focusTrapStack.filter((ft) => ft !== focusTrap);
let stack = this._focusTrapStack;
if (stack.length) {
stack[stack.length - 1]._disable();
}
stack.push(focusTrap);
focusTrap._enable();
}
/**
* Removes the FocusTrap from the stack, and activates the
* FocusTrap that is the new top of the stack.
*/
deregister(focusTrap) {
focusTrap._disable();
const stack = this._focusTrapStack;
const i = stack.indexOf(focusTrap);
if (i !== -1) {
stack.splice(i, 1);
if (stack.length) {
stack[stack.length - 1]._enable();
}
}
}
}
FocusTrapManager.ɵprov = i0.ɵɵdefineInjectable({ factory: function FocusTrapManager_Factory() { return new FocusTrapManager(); }, token: FocusTrapManager, providedIn: "root" });
FocusTrapManager.decorators = [
{ type: Injectable, args: [{ providedIn: 'root' },] }
];
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