| /** |
| * @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 { coerceNumberProperty } from '@angular/cdk/coercion'; |
| /** Mixin to augment a directive with a `tabIndex` property. */ |
| export function mixinTabIndex(base, defaultTabIndex = 0) { |
| // Note: We cast `base` to `unknown` and then `Constructor`. It could be an abstract class, |
| // but given we `extend` it from another class, we can assume a constructor being accessible. |
| class Mixin extends base { |
| constructor(...args) { |
| super(...args); |
| this._tabIndex = defaultTabIndex; |
| this.defaultTabIndex = defaultTabIndex; |
| } |
| get tabIndex() { return this.disabled ? -1 : this._tabIndex; } |
| set tabIndex(value) { |
| // If the specified tabIndex value is null or undefined, fall back to the default value. |
| this._tabIndex = value != null ? coerceNumberProperty(value) : this.defaultTabIndex; |
| } |
| } |
| // Since we don't directly extend from `base` with it's original types, and we instruct |
| // TypeScript that `T` actually is instantiatable through `new`, the types don't overlap. |
| // This is a limitation in TS as abstract classes cannot be typed properly dynamically. |
| return Mixin; |
| } |
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