@angular/material
Version:
Angular Material
83 lines • 10.6 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 { Directive, Input, ContentChildren, QueryList, } from '@angular/core';
import { coerceBooleanProperty } from '@angular/cdk/coercion';
import { CdkAccordion } from '@angular/cdk/accordion';
import { FocusKeyManager } from '@angular/cdk/a11y';
import { startWith } from 'rxjs/operators';
import { MAT_ACCORDION } from './accordion-base';
import { MatExpansionPanelHeader } from './expansion-panel-header';
/**
* Directive for a Material Design Accordion.
*/
export class MatAccordion extends CdkAccordion {
constructor() {
super(...arguments);
/** Headers belonging to this accordion. */
this._ownHeaders = new QueryList();
this._hideToggle = false;
/**
* Display mode used for all expansion panels in the accordion. Currently two display
* modes exist:
* default - a gutter-like spacing is placed around any expanded panel, placing the expanded
* panel at a different elevation from the rest of the accordion.
* flat - no spacing is placed around expanded panels, showing all panels at the same
* elevation.
*/
this.displayMode = 'default';
/** The position of the expansion indicator. */
this.togglePosition = 'after';
}
/** Whether the expansion indicator should be hidden. */
get hideToggle() { return this._hideToggle; }
set hideToggle(show) { this._hideToggle = coerceBooleanProperty(show); }
ngAfterContentInit() {
this._headers.changes
.pipe(startWith(this._headers))
.subscribe((headers) => {
this._ownHeaders.reset(headers.filter(header => header.panel.accordion === this));
this._ownHeaders.notifyOnChanges();
});
this._keyManager = new FocusKeyManager(this._ownHeaders).withWrap().withHomeAndEnd();
}
/** Handles keyboard events coming in from the panel headers. */
_handleHeaderKeydown(event) {
this._keyManager.onKeydown(event);
}
_handleHeaderFocus(header) {
this._keyManager.updateActiveItem(header);
}
ngOnDestroy() {
super.ngOnDestroy();
this._ownHeaders.destroy();
}
}
MatAccordion.decorators = [
{ type: Directive, args: [{
selector: 'mat-accordion',
exportAs: 'matAccordion',
inputs: ['multi'],
providers: [{
provide: MAT_ACCORDION,
useExisting: MatAccordion
}],
host: {
class: 'mat-accordion',
// Class binding which is only used by the test harness as there is no other
// way for the harness to detect if multiple panel support is enabled.
'[class.mat-accordion-multi]': 'this.multi',
}
},] }
];
MatAccordion.propDecorators = {
_headers: [{ type: ContentChildren, args: [MatExpansionPanelHeader, { descendants: true },] }],
hideToggle: [{ type: Input }],
displayMode: [{ type: Input }],
togglePosition: [{ type: Input }]
};
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