@angular/cdk
Version:
Angular Material Component Development Kit
54 lines • 6.07 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
*/
import { Injectable } from '@angular/core';
import * as i0 from "@angular/core";
/** Injectable that ensures only the most recently enabled FocusTrap is active. */
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();
}
}
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.0.0", ngImport: i0, type: FocusTrapManager, deps: [], target: i0.ɵɵFactoryTarget.Injectable }); }
static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "16.0.0", ngImport: i0, type: FocusTrapManager, providedIn: 'root' }); }
}
export { FocusTrapManager };
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.0.0", ngImport: i0, type: FocusTrapManager, decorators: [{
type: Injectable,
args: [{ providedIn: 'root' }]
}] });
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