@angular/cdk
Version:
Angular Material Component Development Kit
44 lines • 6.14 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 { coerceBooleanProperty } from '@angular/cdk/coercion';
/**
* Mixin to provide a directive with a function that checks if the sticky input has been
* changed since the last time the function was called. Essentially adds a dirty-check to the
* sticky value.
* @docs-private
*/
export function mixinHasStickyInput(base) {
return class extends base {
constructor(...args) {
super(...args);
this._sticky = false;
/** Whether the sticky input has changed since it was last checked. */
this._hasStickyChanged = false;
}
/** Whether sticky positioning should be applied. */
get sticky() {
return this._sticky;
}
set sticky(v) {
const prevValue = this._sticky;
this._sticky = coerceBooleanProperty(v);
this._hasStickyChanged = prevValue !== this._sticky;
}
/** Whether the sticky value has changed since this was last called. */
hasStickyChanged() {
const hasStickyChanged = this._hasStickyChanged;
this._hasStickyChanged = false;
return hasStickyChanged;
}
/** Resets the dirty check for cases where the sticky state has been used without checking. */
resetStickyChanged() {
this._hasStickyChanged = false;
}
};
}
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