@angular/material
Version:
Angular Material
135 lines • 17 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, ElementRef, inject, Input, NgZone, InjectionToken, } from '@angular/core';
import { SharedResizeObserver } from '@angular/cdk/observers/private';
import { Subscription } from 'rxjs';
import * as i0 from "@angular/core";
/** An injion token for the parent form-field. */
export const FLOATING_LABEL_PARENT = new InjectionToken('FloatingLabelParent');
/**
* Internal directive that maintains a MDC floating label. This directive does not
* use the `MDCFloatingLabelFoundation` class, as it is not worth the size cost of
* including it just to measure the label width and toggle some classes.
*
* The use of a directive allows us to conditionally render a floating label in the
* template without having to manually manage instantiation and destruction of the
* floating label component based on.
*
* The component is responsible for setting up the floating label styles, measuring label
* width for the outline notch, and providing inputs that can be used to toggle the
* label's floating or required state.
*/
export class MatFormFieldFloatingLabel {
/** Whether the label is floating. */
get floating() {
return this._floating;
}
set floating(value) {
this._floating = value;
if (this.monitorResize) {
this._handleResize();
}
}
/** Whether to monitor for resize events on the floating label. */
get monitorResize() {
return this._monitorResize;
}
set monitorResize(value) {
this._monitorResize = value;
if (this._monitorResize) {
this._subscribeToResize();
}
else {
this._resizeSubscription.unsubscribe();
}
}
constructor(_elementRef) {
this._elementRef = _elementRef;
this._floating = false;
this._monitorResize = false;
/** The shared ResizeObserver. */
this._resizeObserver = inject(SharedResizeObserver);
/** The Angular zone. */
this._ngZone = inject(NgZone);
/** The parent form-field. */
this._parent = inject(FLOATING_LABEL_PARENT);
/** The current resize event subscription. */
this._resizeSubscription = new Subscription();
}
ngOnDestroy() {
this._resizeSubscription.unsubscribe();
}
/** Gets the width of the label. Used for the outline notch. */
getWidth() {
return estimateScrollWidth(this._elementRef.nativeElement);
}
/** Gets the HTML element for the floating label. */
get element() {
return this._elementRef.nativeElement;
}
/** Handles resize events from the ResizeObserver. */
_handleResize() {
// In the case where the label grows in size, the following sequence of events occurs:
// 1. The label grows by 1px triggering the ResizeObserver
// 2. The notch is expanded to accommodate the entire label
// 3. The label expands to its full width, triggering the ResizeObserver again
//
// This is expected, but If we allow this to all happen within the same macro task it causes an
// error: `ResizeObserver loop limit exceeded`. Therefore we push the notch resize out until
// the next macro task.
setTimeout(() => this._parent._handleLabelResized());
}
/** Subscribes to resize events. */
_subscribeToResize() {
this._resizeSubscription.unsubscribe();
this._ngZone.runOutsideAngular(() => {
this._resizeSubscription = this._resizeObserver
.observe(this._elementRef.nativeElement, { box: 'border-box' })
.subscribe(() => this._handleResize());
});
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "18.0.0", ngImport: i0, type: MatFormFieldFloatingLabel, deps: [{ token: i0.ElementRef }], target: i0.ɵɵFactoryTarget.Directive }); }
static { this.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "18.0.0", type: MatFormFieldFloatingLabel, isStandalone: true, selector: "label[matFormFieldFloatingLabel]", inputs: { floating: "floating", monitorResize: "monitorResize" }, host: { properties: { "class.mdc-floating-label--float-above": "floating" }, classAttribute: "mdc-floating-label mat-mdc-floating-label" }, ngImport: i0 }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "18.0.0", ngImport: i0, type: MatFormFieldFloatingLabel, decorators: [{
type: Directive,
args: [{
selector: 'label[matFormFieldFloatingLabel]',
host: {
'class': 'mdc-floating-label mat-mdc-floating-label',
'[class.mdc-floating-label--float-above]': 'floating',
},
standalone: true,
}]
}], ctorParameters: () => [{ type: i0.ElementRef }], propDecorators: { floating: [{
type: Input
}], monitorResize: [{
type: Input
}] } });
/**
* Estimates the scroll width of an element.
* via https://github.com/material-components/material-components-web/blob/c0a11ef0d000a098fd0c372be8f12d6a99302855/packages/mdc-dom/ponyfill.ts
*/
function estimateScrollWidth(element) {
// Check the offsetParent. If the element inherits display: none from any
// parent, the offsetParent property will be null (see
// https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/offsetParent).
// This check ensures we only clone the node when necessary.
const htmlEl = element;
if (htmlEl.offsetParent !== null) {
return htmlEl.scrollWidth;
}
const clone = htmlEl.cloneNode(true);
clone.style.setProperty('position', 'absolute');
clone.style.setProperty('transform', 'translate(-9999px, -9999px)');
document.documentElement.appendChild(clone);
const scrollWidth = clone.scrollWidth;
clone.remove();
return scrollWidth;
}
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This directive does not\n * use the `MDCFloatingLabelFoundation` class, as it is not worth the size cost of\n * including it just to measure the label width and toggle some classes.\n *\n * The use of a directive allows us to conditionally render a floating label in the\n * template without having to manually manage instantiation and destruction of the\n * floating label component based on.\n *\n * The component is responsible for setting up the floating label styles, measuring label\n * width for the outline notch, and providing inputs that can be used to toggle the\n * label's floating or required state.\n */\n@Directive({\n  selector: 'label[matFormFieldFloatingLabel]',\n  host: {\n    'class': 'mdc-floating-label mat-mdc-floating-label',\n    '[class.mdc-floating-label--float-above]': 'floating',\n  },\n  standalone: true,\n})\nexport class MatFormFieldFloatingLabel implements OnDestroy {\n  /** Whether the label is floating. */\n  @Input()\n  get floating() {\n    return this._floating;\n  }\n  set floating(value: boolean) {\n    this._floating = value;\n    if (this.monitorResize) {\n      this._handleResize();\n    }\n  }\n  private _floating = false;\n\n  /** Whether to monitor for resize events on the floating label. */\n  @Input()\n  get monitorResize() {\n    return this._monitorResize;\n  }\n  set monitorResize(value: boolean) {\n    this._monitorResize = value;\n    if (this._monitorResize) {\n      this._subscribeToResize();\n    } else {\n      this._resizeSubscription.unsubscribe();\n    }\n  }\n  private _monitorResize = false;\n\n  /** The shared ResizeObserver. */\n  private _resizeObserver = inject(SharedResizeObserver);\n\n  /** The Angular zone. */\n  private _ngZone = inject(NgZone);\n\n  /** The parent form-field. */\n  private _parent = inject(FLOATING_LABEL_PARENT);\n\n  /** The current resize event subscription. */\n  private _resizeSubscription = new Subscription();\n\n  constructor(private _elementRef: ElementRef<HTMLElement>) {}\n\n  ngOnDestroy() {\n    this._resizeSubscription.unsubscribe();\n  }\n\n  /** Gets the width of the label. Used for the outline notch. */\n  getWidth(): number {\n    return estimateScrollWidth(this._elementRef.nativeElement);\n  }\n\n  /** Gets the HTML element for the floating label. */\n  get element(): HTMLElement {\n    return this._elementRef.nativeElement;\n  }\n\n  /** Handles resize events from the ResizeObserver. */\n  private _handleResize() {\n    // In the case where the label grows in size, the following sequence of events occurs:\n    // 1. The label grows by 1px triggering the ResizeObserver\n    // 2. The notch is expanded to accommodate the entire label\n    // 3. The label expands to its full width, triggering the ResizeObserver again\n    //\n    // This is expected, but If we allow this to all happen within the same macro task it causes an\n    // error: `ResizeObserver loop limit exceeded`. Therefore we push the notch resize out until\n    // the next macro task.\n    setTimeout(() => this._parent._handleLabelResized());\n  }\n\n  /** Subscribes to resize events. */\n  private _subscribeToResize() {\n    this._resizeSubscription.unsubscribe();\n    this._ngZone.runOutsideAngular(() => {\n      this._resizeSubscription = this._resizeObserver\n        .observe(this._elementRef.nativeElement, {box: 'border-box'})\n        .subscribe(() => this._handleResize());\n    });\n  }\n}\n\n/**\n * Estimates the scroll width of an element.\n * via https://github.com/material-components/material-components-web/blob/c0a11ef0d000a098fd0c372be8f12d6a99302855/packages/mdc-dom/ponyfill.ts\n */\nfunction estimateScrollWidth(element: HTMLElement): number {\n  // Check the offsetParent. If the element inherits display: none from any\n  // parent, the offsetParent property will be null (see\n  // https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/offsetParent).\n  // This check ensures we only clone the node when necessary.\n  const htmlEl = element as HTMLElement;\n  if (htmlEl.offsetParent !== null) {\n    return htmlEl.scrollWidth;\n  }\n\n  const clone = htmlEl.cloneNode(true) as HTMLElement;\n  clone.style.setProperty('position', 'absolute');\n  clone.style.setProperty('transform', 'translate(-9999px, -9999px)');\n  document.documentElement.appendChild(clone);\n  const scrollWidth = clone.scrollWidth;\n  clone.remove();\n  return scrollWidth;\n}\n"]}