ng-zorro-antd
Version:
An enterprise-class UI components based on Ant Design and Angular
176 lines • 26.2 kB
JavaScript
/**
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://github.com/NG-ZORRO/ng-zorro-antd/blob/master/LICENSE
*/
import { Platform } from '@angular/cdk/platform';
import { Directive, ElementRef, Input, NgZone } from '@angular/core';
import { NzResizeService } from 'ng-zorro-antd/core/services';
import { Subject } from 'rxjs';
import { takeUntil } from 'rxjs/operators';
export class NzAutosizeDirective {
constructor(elementRef, ngZone, platform, resizeService) {
this.elementRef = elementRef;
this.ngZone = ngZone;
this.platform = platform;
this.resizeService = resizeService;
this.autosize = false;
this.el = this.elementRef.nativeElement;
this.maxHeight = null;
this.minHeight = null;
this.destroy$ = new Subject();
this.inputGap = 10;
}
set nzAutosize(value) {
const isAutoSizeType = (data) => {
return typeof data !== 'string' && typeof data !== 'boolean' && (!!data.maxRows || !!data.minRows);
};
if (typeof value === 'string' || value === true) {
this.autosize = true;
}
else if (isAutoSizeType(value)) {
this.autosize = true;
this.minRows = value.minRows;
this.maxRows = value.maxRows;
this.maxHeight = this.setMaxHeight();
this.minHeight = this.setMinHeight();
}
}
resizeToFitContent(force = false) {
this.cacheTextareaLineHeight();
// 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.el;
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 placeholderText = textarea.placeholder;
// 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.
// Long placeholders that are wider than the textarea width may lead to a bigger scrollHeight
// value. To ensure that the scrollHeight is not bigger than the content, the placeholders
// need to be removed temporarily.
textarea.classList.add('nz-textarea-autosize-measuring');
textarea.placeholder = '';
let height = Math.round((textarea.scrollHeight - this.inputGap) / this.cachedLineHeight) * this.cachedLineHeight + this.inputGap;
if (this.maxHeight !== null && height > this.maxHeight) {
height = this.maxHeight;
}
if (this.minHeight !== null && height < this.minHeight) {
height = this.minHeight;
}
// Use the scrollHeight to know how large the textarea *would* be if fit its entire value.
textarea.style.height = `${height}px`;
textarea.classList.remove('nz-textarea-autosize-measuring');
textarea.placeholder = placeholderText;
// On Firefox resizing the textarea will prevent it from scrolling to the caret position.
// We need to re-set the selection in order for it to scroll to the proper position.
if (typeof requestAnimationFrame !== 'undefined') {
this.ngZone.runOutsideAngular(() => requestAnimationFrame(() => {
const { selectionStart, selectionEnd } = textarea;
// IE will throw an "Unspecified error" if we try to set the selection range after the
// element has been removed from the DOM. Assert that the directive hasn't been destroyed
// between the time we requested the animation frame and when it was executed.
// Also note that we have to assert that the textarea is focused before we set the
// selection range. Setting the selection range on a non-focused textarea will cause
// it to receive focus on IE and Edge.
if (!this.destroy$.isStopped && document.activeElement === textarea) {
textarea.setSelectionRange(selectionStart, selectionEnd);
}
}));
}
this.previousValue = value;
this.previousMinRows = this.minRows;
}
cacheTextareaLineHeight() {
if (this.cachedLineHeight >= 0 || !this.el.parentNode) {
return;
}
// Use a clone element because we have to override some styles.
const textareaClone = this.el.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.el.parentNode.appendChild(textareaClone);
this.cachedLineHeight = textareaClone.clientHeight - this.inputGap;
this.el.parentNode.removeChild(textareaClone);
// Min and max heights have to be re-calculated if the cached line height changes
this.maxHeight = this.setMaxHeight();
this.minHeight = this.setMinHeight();
}
setMinHeight() {
const minHeight = this.minRows && this.cachedLineHeight ? this.minRows * this.cachedLineHeight + this.inputGap : null;
if (minHeight !== null) {
this.el.style.minHeight = `${minHeight}px`;
}
return minHeight;
}
setMaxHeight() {
const maxHeight = this.maxRows && this.cachedLineHeight ? this.maxRows * this.cachedLineHeight + this.inputGap : null;
if (maxHeight !== null) {
this.el.style.maxHeight = `${maxHeight}px`;
}
return maxHeight;
}
noopInputHandler() {
// no-op handler that ensures we're running change detection on input events.
}
ngAfterViewInit() {
if (this.autosize && this.platform.isBrowser) {
this.resizeToFitContent();
this.resizeService
.subscribe()
.pipe(takeUntil(this.destroy$))
.subscribe(() => this.resizeToFitContent(true));
}
}
ngOnDestroy() {
this.destroy$.next();
this.destroy$.complete();
}
ngDoCheck() {
if (this.autosize && this.platform.isBrowser) {
this.resizeToFitContent();
}
}
}
NzAutosizeDirective.decorators = [
{ type: Directive, args: [{
selector: 'textarea[nzAutosize]',
exportAs: 'nzAutosize',
host: {
// 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',
'(input)': 'noopInputHandler()'
}
},] }
];
NzAutosizeDirective.ctorParameters = () => [
{ type: ElementRef },
{ type: NgZone },
{ type: Platform },
{ type: NzResizeService }
];
NzAutosizeDirective.propDecorators = {
nzAutosize: [{ type: Input }]
};
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* Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://github.com/NG-ZORRO/ng-zorro-antd/blob/master/LICENSE\n */\n\nimport { Platform } from '@angular/cdk/platform';\nimport { AfterViewInit, Directive, DoCheck, ElementRef, Input, NgZone, OnDestroy } from '@angular/core';\nimport { NzResizeService } from 'ng-zorro-antd/core/services';\nimport { Subject } from 'rxjs';\nimport { takeUntil } from 'rxjs/operators';\n\nexport interface AutoSizeType {\n  minRows?: number;\n  maxRows?: number;\n}\n\n@Directive({\n  selector: 'textarea[nzAutosize]',\n  exportAs: 'nzAutosize',\n  host: {\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    '(input)': 'noopInputHandler()'\n  }\n})\nexport class NzAutosizeDirective implements AfterViewInit, OnDestroy, DoCheck {\n  private autosize: boolean = false;\n  private el: HTMLTextAreaElement | HTMLInputElement = this.elementRef.nativeElement;\n  private cachedLineHeight!: number;\n  private previousValue!: string;\n  private previousMinRows: number | undefined;\n  private minRows: number | undefined;\n  private maxRows: number | undefined;\n  private maxHeight: number | null = null;\n  private minHeight: number | null = null;\n  private destroy$ = new Subject();\n  private inputGap = 10;\n\n  @Input()\n  set nzAutosize(value: string | boolean | AutoSizeType) {\n    const isAutoSizeType = (data: string | boolean | AutoSizeType): data is AutoSizeType => {\n      return typeof data !== 'string' && typeof data !== 'boolean' && (!!data.maxRows || !!data.minRows);\n    };\n    if (typeof value === 'string' || value === true) {\n      this.autosize = true;\n    } else if (isAutoSizeType(value)) {\n      this.autosize = true;\n      this.minRows = value.minRows;\n      this.maxRows = value.maxRows;\n      this.maxHeight = this.setMaxHeight();\n      this.minHeight = this.setMinHeight();\n    }\n  }\n\n  resizeToFitContent(force: boolean = false): void {\n    this.cacheTextareaLineHeight();\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.el 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    const placeholderText = textarea.placeholder;\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    // Long placeholders that are wider than the textarea width may lead to a bigger scrollHeight\n    // value. To ensure that the scrollHeight is not bigger than the content, the placeholders\n    // need to be removed temporarily.\n    textarea.classList.add('nz-textarea-autosize-measuring');\n    textarea.placeholder = '';\n    let height = Math.round((textarea.scrollHeight - this.inputGap) / this.cachedLineHeight) * this.cachedLineHeight + this.inputGap;\n    if (this.maxHeight !== null && height > this.maxHeight) {\n      height = this.maxHeight!;\n    }\n    if (this.minHeight !== null && height < this.minHeight) {\n      height = this.minHeight!;\n    }\n    // Use the scrollHeight to know how large the textarea *would* be if fit its entire value.\n    textarea.style.height = `${height}px`;\n    textarea.classList.remove('nz-textarea-autosize-measuring');\n    textarea.placeholder = placeholderText;\n\n    // On Firefox resizing the textarea will prevent it from scrolling to the caret position.\n    // We need to re-set the selection in order for it to scroll to the proper position.\n    if (typeof requestAnimationFrame !== 'undefined') {\n      this.ngZone.runOutsideAngular(() =>\n        requestAnimationFrame(() => {\n          const { selectionStart, selectionEnd } = textarea;\n\n          // IE will throw an \"Unspecified error\" if we try to set the selection range after the\n          // element has been removed from the DOM. Assert that the directive hasn't been destroyed\n          // between the time we requested the animation frame and when it was executed.\n          // Also note that we have to assert that the textarea is focused before we set the\n          // selection range. Setting the selection range on a non-focused textarea will cause\n          // it to receive focus on IE and Edge.\n          if (!this.destroy$.isStopped && document.activeElement === textarea) {\n            textarea.setSelectionRange(selectionStart, selectionEnd);\n          }\n        })\n      );\n    }\n\n    this.previousValue = value;\n    this.previousMinRows = this.minRows;\n  }\n\n  private cacheTextareaLineHeight(): void {\n    if (this.cachedLineHeight >= 0 || !this.el.parentNode) {\n      return;\n    }\n\n    // Use a clone element because we have to override some styles.\n    const textareaClone = this.el.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.el.parentNode!.appendChild(textareaClone);\n    this.cachedLineHeight = textareaClone.clientHeight - this.inputGap;\n    this.el.parentNode!.removeChild(textareaClone);\n\n    // Min and max heights have to be re-calculated if the cached line height changes\n    this.maxHeight = this.setMaxHeight();\n    this.minHeight = this.setMinHeight();\n  }\n\n  setMinHeight(): number | null {\n    const minHeight = this.minRows && this.cachedLineHeight ? this.minRows * this.cachedLineHeight + this.inputGap : null;\n\n    if (minHeight !== null) {\n      this.el.style.minHeight = `${minHeight}px`;\n    }\n    return minHeight;\n  }\n\n  setMaxHeight(): number | null {\n    const maxHeight = this.maxRows && this.cachedLineHeight ? this.maxRows * this.cachedLineHeight + this.inputGap : null;\n    if (maxHeight !== null) {\n      this.el.style.maxHeight = `${maxHeight}px`;\n    }\n    return maxHeight;\n  }\n\n  noopInputHandler(): void {\n    // no-op handler that ensures we're running change detection on input events.\n  }\n\n  constructor(private elementRef: ElementRef, private ngZone: NgZone, private platform: Platform, private resizeService: NzResizeService) {}\n\n  ngAfterViewInit(): void {\n    if (this.autosize && this.platform.isBrowser) {\n      this.resizeToFitContent();\n      this.resizeService\n        .subscribe()\n        .pipe(takeUntil(this.destroy$))\n        .subscribe(() => this.resizeToFitContent(true));\n    }\n  }\n\n  ngOnDestroy(): void {\n    this.destroy$.next();\n    this.destroy$.complete();\n  }\n\n  ngDoCheck(): void {\n    if (this.autosize && this.platform.isBrowser) {\n      this.resizeToFitContent();\n    }\n  }\n}\n"]}