@angular/cdk
Version:
Angular Material Component Development Kit
273 lines • 39.1 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, coerceNumberProperty } from '@angular/cdk/coercion';
import { Directive, ElementRef, Input, NgZone, HostListener, Optional, Inject, } from '@angular/core';
import { Platform } from '@angular/cdk/platform';
import { auditTime, takeUntil } from 'rxjs/operators';
import { fromEvent, Subject } from 'rxjs';
import { DOCUMENT } from '@angular/common';
/** Directive to automatically resize a textarea to fit its content. */
export class CdkTextareaAutosize {
constructor(_elementRef, _platform, _ngZone,
/** @breaking-change 11.0.0 make document required */
document) {
this._elementRef = _elementRef;
this._platform = _platform;
this._ngZone = _ngZone;
this._destroyed = new Subject();
this._enabled = true;
/**
* Value of minRows as of last resize. If the minRows has decreased, the
* height of the textarea needs to be recomputed to reflect the new minimum. The maxHeight
* does not have the same problem because it does not affect the textarea's scrollHeight.
*/
this._previousMinRows = -1;
this._isViewInited = false;
this._document = document;
this._textareaElement = this._elementRef.nativeElement;
this._measuringClass = _platform.FIREFOX ?
'cdk-textarea-autosize-measuring-firefox' :
'cdk-textarea-autosize-measuring';
}
/** Minimum amount of rows in the textarea. */
get minRows() { return this._minRows; }
set minRows(value) {
this._minRows = coerceNumberProperty(value);
this._setMinHeight();
}
/** Maximum amount of rows in the textarea. */
get maxRows() { return this._maxRows; }
set maxRows(value) {
this._maxRows = coerceNumberProperty(value);
this._setMaxHeight();
}
/** Whether autosizing is enabled or not */
get enabled() { return this._enabled; }
set enabled(value) {
value = coerceBooleanProperty(value);
// Only act if the actual value changed. This specifically helps to not run
// resizeToFitContent too early (i.e. before ngAfterViewInit)
if (this._enabled !== value) {
(this._enabled = value) ? this.resizeToFitContent(true) : this.reset();
}
}
get placeholder() { return this._textareaElement.placeholder; }
set placeholder(value) {
this._cachedPlaceholderHeight = undefined;
this._textareaElement.placeholder = value;
this._cacheTextareaPlaceholderHeight();
}
/** Sets the minimum height of the textarea as determined by minRows. */
_setMinHeight() {
const minHeight = this.minRows && this._cachedLineHeight ?
`${this.minRows * this._cachedLineHeight}px` : null;
if (minHeight) {
this._textareaElement.style.minHeight = minHeight;
}
}
/** Sets the maximum height of the textarea as determined by maxRows. */
_setMaxHeight() {
const maxHeight = this.maxRows && this._cachedLineHeight ?
`${this.maxRows * this._cachedLineHeight}px` : null;
if (maxHeight) {
this._textareaElement.style.maxHeight = maxHeight;
}
}
ngAfterViewInit() {
if (this._platform.isBrowser) {
// Remember the height which we started with in case autosizing is disabled
this._initialHeight = this._textareaElement.style.height;
this.resizeToFitContent();
this._ngZone.runOutsideAngular(() => {
const window = this._getWindow();
fromEvent(window, 'resize')
.pipe(auditTime(16), takeUntil(this._destroyed))
.subscribe(() => this.resizeToFitContent(true));
});
this._isViewInited = true;
this.resizeToFitContent(true);
}
}
ngOnDestroy() {
this._destroyed.next();
this._destroyed.complete();
}
/**
* Cache the height of a single-row textarea if it has not already been cached.
*
* We need to know how large a single "row" of a textarea is in order to apply minRows and
* maxRows. For the initial version, we will assume that the height of a single line in the
* textarea does not ever change.
*/
_cacheTextareaLineHeight() {
if (this._cachedLineHeight) {
return;
}
// Use a clone element because we have to override some styles.
let textareaClone = this._textareaElement.cloneNode(false);
textareaClone.rows = 1;
// Use `position: absolute` so that this doesn't cause a browser layout and use
// `visibility: hidden` so that nothing is rendered. Clear any other styles that
// would affect the height.
textareaClone.style.position = 'absolute';
textareaClone.style.visibility = 'hidden';
textareaClone.style.border = 'none';
textareaClone.style.padding = '0';
textareaClone.style.height = '';
textareaClone.style.minHeight = '';
textareaClone.style.maxHeight = '';
// In Firefox it happens that textarea elements are always bigger than the specified amount
// of rows. This is because Firefox tries to add extra space for the horizontal scrollbar.
// As a workaround that removes the extra space for the scrollbar, we can just set overflow
// to hidden. This ensures that there is no invalid calculation of the line height.
// See Firefox bug report: https://bugzilla.mozilla.org/show_bug.cgi?id=33654
textareaClone.style.overflow = 'hidden';
this._textareaElement.parentNode.appendChild(textareaClone);
this._cachedLineHeight = textareaClone.clientHeight;
this._textareaElement.parentNode.removeChild(textareaClone);
// Min and max heights have to be re-calculated if the cached line height changes
this._setMinHeight();
this._setMaxHeight();
}
_measureScrollHeight() {
// Reset the textarea height to auto in order to shrink back to its default size.
// Also temporarily force overflow:hidden, so scroll bars do not interfere with calculations.
this._textareaElement.classList.add(this._measuringClass);
// The measuring class includes a 2px padding to workaround an issue with Chrome,
// so we account for that extra space here by subtracting 4 (2px top + 2px bottom).
const scrollHeight = this._textareaElement.scrollHeight - 4;
this._textareaElement.classList.remove(this._measuringClass);
return scrollHeight;
}
_cacheTextareaPlaceholderHeight() {
if (!this._isViewInited || this._cachedPlaceholderHeight != undefined) {
return;
}
if (!this.placeholder) {
this._cachedPlaceholderHeight = 0;
return;
}
const value = this._textareaElement.value;
this._textareaElement.value = this._textareaElement.placeholder;
this._cachedPlaceholderHeight = this._measureScrollHeight();
this._textareaElement.value = value;
}
ngDoCheck() {
if (this._platform.isBrowser) {
this.resizeToFitContent();
}
}
/**
* Resize the textarea to fit its content.
* @param force Whether to force a height recalculation. By default the height will be
* recalculated only if the value changed since the last call.
*/
resizeToFitContent(force = false) {
// If autosizing is disabled, just skip everything else
if (!this._enabled) {
return;
}
this._cacheTextareaLineHeight();
this._cacheTextareaPlaceholderHeight();
// If we haven't determined the line-height yet, we know we're still hidden and there's no point
// in checking the height of the textarea.
if (!this._cachedLineHeight) {
return;
}
const textarea = this._elementRef.nativeElement;
const value = textarea.value;
// Only resize if the value or minRows have changed since these calculations can be expensive.
if (!force && this._minRows === this._previousMinRows && value === this._previousValue) {
return;
}
const scrollHeight = this._measureScrollHeight();
const height = Math.max(scrollHeight, this._cachedPlaceholderHeight || 0);
// Use the scrollHeight to know how large the textarea *would* be if fit its entire value.
textarea.style.height = `${height}px`;
this._ngZone.runOutsideAngular(() => {
if (typeof requestAnimationFrame !== 'undefined') {
requestAnimationFrame(() => this._scrollToCaretPosition(textarea));
}
else {
setTimeout(() => this._scrollToCaretPosition(textarea));
}
});
this._previousValue = value;
this._previousMinRows = this._minRows;
}
/**
* Resets the textarea to its original size
*/
reset() {
// Do not try to change the textarea, if the initialHeight has not been determined yet
// This might potentially remove styles when reset() is called before ngAfterViewInit
if (this._initialHeight !== undefined) {
this._textareaElement.style.height = this._initialHeight;
}
}
// In Ivy the `host` metadata will be merged, whereas in ViewEngine it is overridden. In order
// to avoid double event listeners, we need to use `HostListener`. Once Ivy is the default, we
// can move this back into `host`.
// tslint:disable:no-host-decorator-in-concrete
_noopInputHandler() {
// no-op handler that ensures we're running change detection on input events.
}
/** Access injected document if available or fallback to global document reference */
_getDocument() {
return this._document || document;
}
/** Use defaultView of injected document if available or fallback to global window reference */
_getWindow() {
const doc = this._getDocument();
return doc.defaultView || window;
}
/**
* Scrolls a textarea to the caret position. On Firefox resizing the textarea will
* prevent it from scrolling to the caret position. We need to re-set the selection
* in order for it to scroll to the proper position.
*/
_scrollToCaretPosition(textarea) {
const { selectionStart, selectionEnd } = textarea;
const document = this._getDocument();
// IE will throw an "Unspecified error" if we try to set the selection range after the
// element has been removed from the DOM. Assert that the directive hasn't been destroyed
// between the time we requested the animation frame and when it was executed.
// Also note that we have to assert that the textarea is focused before we set the
// selection range. Setting the selection range on a non-focused textarea will cause
// it to receive focus on IE and Edge.
if (!this._destroyed.isStopped && document.activeElement === textarea) {
textarea.setSelectionRange(selectionStart, selectionEnd);
}
}
}
CdkTextareaAutosize.decorators = [
{ type: Directive, args: [{
selector: 'textarea[cdkTextareaAutosize]',
exportAs: 'cdkTextareaAutosize',
host: {
'class': 'cdk-textarea-autosize',
// Textarea elements that have the directive applied should have a single row by default.
// Browsers normally show two rows by default and therefore this limits the minRows binding.
'rows': '1',
},
},] }
];
CdkTextareaAutosize.ctorParameters = () => [
{ type: ElementRef },
{ type: Platform },
{ type: NgZone },
{ type: undefined, decorators: [{ type: Optional }, { type: Inject, args: [DOCUMENT,] }] }
];
CdkTextareaAutosize.propDecorators = {
minRows: [{ type: Input, args: ['cdkAutosizeMinRows',] }],
maxRows: [{ type: Input, args: ['cdkAutosizeMaxRows',] }],
enabled: [{ type: Input, args: ['cdkTextareaAutosize',] }],
placeholder: [{ type: Input }],
_noopInputHandler: [{ type: HostListener, args: ['input',] }]
};
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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {\n  BooleanInput,\n  coerceBooleanProperty,\n  coerceNumberProperty,\n  NumberInput\n} from '@angular/cdk/coercion';\nimport {\n  Directive,\n  ElementRef,\n  Input,\n  AfterViewInit,\n  DoCheck,\n  OnDestroy,\n  NgZone,\n  HostListener,\n  Optional,\n  Inject,\n} from '@angular/core';\nimport {Platform} from '@angular/cdk/platform';\nimport {auditTime, takeUntil} from 'rxjs/operators';\nimport {fromEvent, Subject} from 'rxjs';\nimport {DOCUMENT} from '@angular/common';\n\n/** Directive to automatically resize a textarea to fit its content. */\n@Directive({\n  selector: 'textarea[cdkTextareaAutosize]',\n  exportAs: 'cdkTextareaAutosize',\n  host: {\n    'class': 'cdk-textarea-autosize',\n    // Textarea elements that have the directive applied should have a single row by default.\n    // Browsers normally show two rows by default and therefore this limits the minRows binding.\n    'rows': '1',\n  },\n})\nexport class CdkTextareaAutosize implements AfterViewInit, DoCheck, OnDestroy {\n  /** Keep track of the previous textarea value to avoid resizing when the value hasn't changed. */\n  private _previousValue?: string;\n  private _initialHeight: string | undefined;\n  private readonly _destroyed = new Subject<void>();\n\n  private _minRows: number;\n  private _maxRows: number;\n  private _enabled: boolean = true;\n\n  /**\n   * Value of minRows as of last resize. If the minRows has decreased, the\n   * height of the textarea needs to be recomputed to reflect the new minimum. The maxHeight\n   * does not have the same problem because it does not affect the textarea's scrollHeight.\n   */\n  private _previousMinRows: number = -1;\n\n  private _textareaElement: HTMLTextAreaElement;\n\n  /** Minimum amount of rows in the textarea. */\n  @Input('cdkAutosizeMinRows')\n  get minRows(): number { return this._minRows; }\n  set minRows(value: number) {\n    this._minRows = coerceNumberProperty(value);\n    this._setMinHeight();\n  }\n\n  /** Maximum amount of rows in the textarea. */\n  @Input('cdkAutosizeMaxRows')\n  get maxRows(): number { return this._maxRows; }\n  set maxRows(value: number) {\n    this._maxRows = coerceNumberProperty(value);\n    this._setMaxHeight();\n  }\n\n  /** Whether autosizing is enabled or not */\n  @Input('cdkTextareaAutosize')\n  get enabled(): boolean { return this._enabled; }\n  set enabled(value: boolean) {\n    value = coerceBooleanProperty(value);\n\n    // Only act if the actual value changed. This specifically helps to not run\n    // resizeToFitContent too early (i.e. before ngAfterViewInit)\n    if (this._enabled !== value) {\n      (this._enabled = value) ? this.resizeToFitContent(true) : this.reset();\n    }\n  }\n\n  @Input()\n  get placeholder(): string { return this._textareaElement.placeholder; }\n  set placeholder(value: string) {\n    this._cachedPlaceholderHeight = undefined;\n    this._textareaElement.placeholder = value;\n    this._cacheTextareaPlaceholderHeight();\n  }\n\n\n  /** Cached height of a textarea with a single row. */\n  private _cachedLineHeight: number;\n  /** Cached height of a textarea with only the placeholder. */\n  private _cachedPlaceholderHeight?: number;\n\n  /** Used to reference correct document/window */\n  protected _document?: Document;\n\n  /** Class that should be applied to the textarea while it's being measured. */\n  private _measuringClass: string;\n\n  private _isViewInited = false;\n\n  constructor(private _elementRef: ElementRef<HTMLElement>,\n              private _platform: Platform,\n              private _ngZone: NgZone,\n              /** @breaking-change 11.0.0 make document required */\n              @Optional() @Inject(DOCUMENT) document?: any) {\n    this._document = document;\n\n    this._textareaElement = this._elementRef.nativeElement as HTMLTextAreaElement;\n    this._measuringClass = _platform.FIREFOX ?\n      'cdk-textarea-autosize-measuring-firefox' :\n      'cdk-textarea-autosize-measuring';\n  }\n\n  /** Sets the minimum height of the textarea as determined by minRows. */\n  _setMinHeight(): void {\n    const minHeight = this.minRows && this._cachedLineHeight ?\n        `${this.minRows * this._cachedLineHeight}px` : null;\n\n    if (minHeight)  {\n      this._textareaElement.style.minHeight = minHeight;\n    }\n  }\n\n  /** Sets the maximum height of the textarea as determined by maxRows. */\n  _setMaxHeight(): void {\n    const maxHeight = this.maxRows && this._cachedLineHeight ?\n        `${this.maxRows * this._cachedLineHeight}px` : null;\n\n    if (maxHeight) {\n      this._textareaElement.style.maxHeight = maxHeight;\n    }\n  }\n\n  ngAfterViewInit() {\n    if (this._platform.isBrowser) {\n      // Remember the height which we started with in case autosizing is disabled\n      this._initialHeight = this._textareaElement.style.height;\n\n      this.resizeToFitContent();\n\n      this._ngZone.runOutsideAngular(() => {\n        const window = this._getWindow();\n\n        fromEvent(window, 'resize')\n          .pipe(auditTime(16), takeUntil(this._destroyed))\n          .subscribe(() => this.resizeToFitContent(true));\n      });\n\n      this._isViewInited = true;\n      this.resizeToFitContent(true);\n    }\n  }\n\n  ngOnDestroy() {\n    this._destroyed.next();\n    this._destroyed.complete();\n  }\n\n  /**\n   * Cache the height of a single-row textarea if it has not already been cached.\n   *\n   * We need to know how large a single \"row\" of a textarea is in order to apply minRows and\n   * maxRows. For the initial version, we will assume that the height of a single line in the\n   * textarea does not ever change.\n   */\n  private _cacheTextareaLineHeight(): void {\n    if (this._cachedLineHeight) {\n      return;\n    }\n\n    // Use a clone element because we have to override some styles.\n    let textareaClone = this._textareaElement.cloneNode(false) as HTMLTextAreaElement;\n    textareaClone.rows = 1;\n\n    // Use `position: absolute` so that this doesn't cause a browser layout and use\n    // `visibility: hidden` so that nothing is rendered. Clear any other styles that\n    // would affect the height.\n    textareaClone.style.position = 'absolute';\n    textareaClone.style.visibility = 'hidden';\n    textareaClone.style.border = 'none';\n    textareaClone.style.padding = '0';\n    textareaClone.style.height = '';\n    textareaClone.style.minHeight = '';\n    textareaClone.style.maxHeight = '';\n\n    // In Firefox it happens that textarea elements are always bigger than the specified amount\n    // of rows. This is because Firefox tries to add extra space for the horizontal scrollbar.\n    // As a workaround that removes the extra space for the scrollbar, we can just set overflow\n    // to hidden. This ensures that there is no invalid calculation of the line height.\n    // See Firefox bug report: https://bugzilla.mozilla.org/show_bug.cgi?id=33654\n    textareaClone.style.overflow = 'hidden';\n\n    this._textareaElement.parentNode!.appendChild(textareaClone);\n    this._cachedLineHeight = textareaClone.clientHeight;\n    this._textareaElement.parentNode!.removeChild(textareaClone);\n\n    // Min and max heights have to be re-calculated if the cached line height changes\n    this._setMinHeight();\n    this._setMaxHeight();\n  }\n\n  private _measureScrollHeight(): number {\n    // Reset the textarea height to auto in order to shrink back to its default size.\n    // Also temporarily force overflow:hidden, so scroll bars do not interfere with calculations.\n    this._textareaElement.classList.add(this._measuringClass);\n    // The measuring class includes a 2px padding to workaround an issue with Chrome,\n    // so we account for that extra space here by subtracting 4 (2px top + 2px bottom).\n    const scrollHeight = this._textareaElement.scrollHeight - 4;\n    this._textareaElement.classList.remove(this._measuringClass);\n\n    return scrollHeight;\n  }\n\n  private _cacheTextareaPlaceholderHeight(): void {\n    if (!this._isViewInited || this._cachedPlaceholderHeight != undefined) {\n      return;\n    }\n    if (!this.placeholder) {\n      this._cachedPlaceholderHeight = 0;\n      return;\n    }\n\n    const value = this._textareaElement.value;\n\n    this._textareaElement.value = this._textareaElement.placeholder;\n    this._cachedPlaceholderHeight = this._measureScrollHeight();\n    this._textareaElement.value = value;\n  }\n\n  ngDoCheck() {\n    if (this._platform.isBrowser) {\n      this.resizeToFitContent();\n    }\n  }\n\n  /**\n   * Resize the textarea to fit its content.\n   * @param force Whether to force a height recalculation. By default the height will be\n   *    recalculated only if the value changed since the last call.\n   */\n  resizeToFitContent(force: boolean = false) {\n    // If autosizing is disabled, just skip everything else\n    if (!this._enabled) {\n      return;\n    }\n\n    this._cacheTextareaLineHeight();\n    this._cacheTextareaPlaceholderHeight();\n\n    // If we haven't determined the line-height yet, we know we're still hidden and there's no point\n    // in checking the height of the textarea.\n    if (!this._cachedLineHeight) {\n      return;\n    }\n\n    const textarea = this._elementRef.nativeElement as HTMLTextAreaElement;\n    const value = textarea.value;\n\n    // Only resize if the value or minRows have changed since these calculations can be expensive.\n    if (!force && this._minRows === this._previousMinRows && value === this._previousValue) {\n      return;\n    }\n\n    const scrollHeight = this._measureScrollHeight();\n    const height = Math.max(scrollHeight, this._cachedPlaceholderHeight || 0);\n\n    // Use the scrollHeight to know how large the textarea *would* be if fit its entire value.\n    textarea.style.height = `${height}px`;\n\n    this._ngZone.runOutsideAngular(() => {\n      if (typeof requestAnimationFrame !== 'undefined') {\n        requestAnimationFrame(() => this._scrollToCaretPosition(textarea));\n      } else {\n        setTimeout(() => this._scrollToCaretPosition(textarea));\n      }\n    });\n\n    this._previousValue = value;\n    this._previousMinRows = this._minRows;\n  }\n\n  /**\n   * Resets the textarea to its original size\n   */\n  reset() {\n    // Do not try to change the textarea, if the initialHeight has not been determined yet\n    // This might potentially remove styles when reset() is called before ngAfterViewInit\n    if (this._initialHeight !== undefined) {\n      this._textareaElement.style.height = this._initialHeight;\n    }\n  }\n\n  // In Ivy the `host` metadata will be merged, whereas in ViewEngine it is overridden. In order\n  // to avoid double event listeners, we need to use `HostListener`. Once Ivy is the default, we\n  // can move this back into `host`.\n  // tslint:disable:no-host-decorator-in-concrete\n  @HostListener('input')\n  _noopInputHandler() {\n    // no-op handler that ensures we're running change detection on input events.\n  }\n\n  /** Access injected document if available or fallback to global document reference */\n  private _getDocument(): Document {\n    return this._document || document;\n  }\n\n  /** Use defaultView of injected document if available or fallback to global window reference */\n  private _getWindow(): Window {\n    const doc = this._getDocument();\n    return doc.defaultView || window;\n  }\n\n  /**\n   * Scrolls a textarea to the caret position. On Firefox resizing the textarea will\n   * prevent it from scrolling to the caret position. We need to re-set the selection\n   * in order for it to scroll to the proper position.\n   */\n  private _scrollToCaretPosition(textarea: HTMLTextAreaElement) {\n    const {selectionStart, selectionEnd} = textarea;\n    const document = this._getDocument();\n\n    // IE will throw an \"Unspecified error\" if we try to set the selection range after the\n    // element has been removed from the DOM. Assert that the directive hasn't been destroyed\n    // between the time we requested the animation frame and when it was executed.\n    // Also note that we have to assert that the textarea is focused before we set the\n    // selection range. Setting the selection range on a non-focused textarea will cause\n    // it to receive focus on IE and Edge.\n    if (!this._destroyed.isStopped && document.activeElement === textarea) {\n      textarea.setSelectionRange(selectionStart, selectionEnd);\n    }\n  }\n\n  static ngAcceptInputType_minRows: NumberInput;\n  static ngAcceptInputType_maxRows: NumberInput;\n  static ngAcceptInputType_enabled: BooleanInput;\n}\n"]}