/** * @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; /** Handles `focus` and `blur` events. */ this._handleFocusEvent = (event) => { this._hasFocus = event.type === 'focus'; }; this._document = document; this._textareaElement = this._elementRef.nativeElement; } /** 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._textareaElement.addEventListener('focus', this._handleFocusEvent); this._textareaElement.addEventListener('blur', this._handleFocusEvent); }); this._isViewInited = true; this.resizeToFitContent(true); } } ngOnDestroy() { this._textareaElement.removeEventListener('focus', this._handleFocusEvent); this._textareaElement.removeEventListener('blur', this._handleFocusEvent); 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() { const element = this._textareaElement; const previousMargin = element.style.marginBottom || ''; const isFirefox = this._platform.FIREFOX; const needsMarginFiller = isFirefox && this._hasFocus; const measuringClass = isFirefox ? 'cdk-textarea-autosize-measuring-firefox' : 'cdk-textarea-autosize-measuring'; // In some cases the page might move around while we're measuring the `textarea` on Firefox. We // work around it by assigning a temporary margin with the same height as the `textarea` so that // it occupies the same amount of space. See #23233. if (needsMarginFiller) { element.style.marginBottom = `${element.clientHeight}px`; } // 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. element.classList.add(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 = element.scrollHeight - 4; element.classList.remove(measuringClass); if (needsMarginFiller) { element.style.marginBottom = previousMargin; } 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; // 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 && this._hasFocus) { 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  private _hasFocus: boolean;\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  }\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      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        this._textareaElement.addEventListener('focus', this._handleFocusEvent);\n        this._textareaElement.addEventListener('blur', this._handleFocusEvent);\n      });\n\n      this._isViewInited = true;\n      this.resizeToFitContent(true);\n    }\n  }\n\n  ngOnDestroy() {\n    this._textareaElement.removeEventListener('focus', this._handleFocusEvent);\n    this._textareaElement.removeEventListener('blur', this._handleFocusEvent);\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    const element = this._textareaElement;\n    const previousMargin = element.style.marginBottom || '';\n    const isFirefox = this._platform.FIREFOX;\n    const needsMarginFiller = isFirefox && this._hasFocus;\n    const measuringClass = isFirefox ?\n      'cdk-textarea-autosize-measuring-firefox' :\n      'cdk-textarea-autosize-measuring';\n\n    // In some cases the page might move around while we're measuring the `textarea` on Firefox. We\n    // work around it by assigning a temporary margin with the same height as the `textarea` so that\n    // it occupies the same amount of space. See #23233.\n    if (needsMarginFiller) {\n      element.style.marginBottom = `${element.clientHeight}px`;\n    }\n\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    element.classList.add(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 = element.scrollHeight - 4;\n    element.classList.remove(measuringClass);\n\n    if (needsMarginFiller) {\n      element.style.marginBottom = previousMargin;\n    }\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  /** Handles `focus` and `blur` events. */\n  private _handleFocusEvent = (event: FocusEvent) => {\n    this._hasFocus = event.type === 'focus';\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\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 && this._hasFocus) {\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"]}