@ogs-gmbh/ngx-utils
Version:
A lightweight collection of utility functions and helpers for Angular applications
202 lines • 26.5 kB
JavaScript
/* eslint-disable @tseslint/no-non-null-assertion */
import { computed, Directive, ElementRef, inject, input, Renderer2 } from '@angular/core';
import { toObservable } from '@angular/core/rxjs-interop';
import { animationFrameScheduler, debounceTime, filter, fromEvent, merge, throttleTime } from 'rxjs';
import { CanvasMeasurerService } from './services/canvas-measurer-service.service';
import * as i0 from "@angular/core";
/**
* Rounds a number up only if its fractional part is at or above the given threshold.
*
* @param value - The value to round.
* @param threshold - The fractional cutoff (0–1) above which to round up.
* @returns The rounded integer.
*/
function roundWithThreshold(value, threshold) {
const integerPart = Math.floor(value);
const fraction = value - integerPart;
return fraction >= threshold
? Math.ceil(value)
: integerPart;
}
/**
* Determines whether a word of a given width fits into the remaining line width,
* taking into account the ellipsis width on the last line.
*
* @param wordWidth - Pixel width of the current word.
* @param remainingWidth - Remaining pixel width in the current line.
* @param currentLine - 1-based index of the current line.
* @param maxLines - Total number of allowed lines.
* @param ellipsisWidth - Pixel width of the ellipsis string.
* @returns True if the word can fit, false otherwise.
*/
// eslint-disable-next-line @tseslint/max-params
function fits(wordWidth, remainingWidth, currentLine, maxLines, ellipsisWidth) {
// If last word reached take ellipsis into account
if (currentLine === maxLines)
return wordWidth + ellipsisWidth <= remainingWidth;
return wordWidth <= remainingWidth;
}
/**
* Clamps text to its available space and appends a custom ellipsis.
*
* @remarks
* Limits content automatically to the available size of the parent container.
* Takes Line height into account as well as preserving whole words.
* Works with changing input in form of signals as well as static input.
*
* @example **Template (HTML)**
* ```html
* <p
* textClamp
* [text]="myText()"
* [ellipsis]="'… more'"></p>
* ```
*
* @example **Component (TypeScript)**
* ```ts
* @Component({
* standalone: true,
* selector: 'app-foo',
* imports: [TextClampDirective]
* })
* export class ArticleCardComponent {
* protected myText: WritableSignal<string> = signal<string>("...");
*
* protected onMyEvent(): void {
* this.myText.set("something else...")
* }
* }
* ```
*/
export class TextClampDirective {
_isTextInitialized = false;
_renderer = inject(Renderer2);
_htmlElement = inject((ElementRef));
get _nativeElement() {
if (this._htmlElement?.nativeElement)
return this._htmlElement.nativeElement;
return undefined;
}
text = input.required();
ellipsis = input("...");
_textChange$ = toObservable(this.text);
_canvasMeasureService = inject(CanvasMeasurerService);
// eslint-disable-next-line @unicorn/consistent-function-scoping
_words = computed(() => {
let words = [];
if (this.text())
words = this.text().split(" ");
return words;
});
ngAfterViewInit() {
const visibility$ = fromEvent(document, "visibilitychange");
const focus$ = fromEvent(window, "focus");
const resize$ = fromEvent(window, "resize");
// Slower throttle for refocus
// eslint-disable-next-line @tseslint/typedef
const refocus$ = merge(visibility$, focus$).pipe(throttleTime(500));
// Fast throttle for change in text or resize
// eslint-disable-next-line @tseslint/typedef
const fastChange$ = merge(resize$, this._textChange$).pipe(debounceTime(10));
merge(refocus$, fastChange$)
.pipe(filter(() => !document.hidden), debounceTime(0, animationFrameScheduler))
.subscribe(() => {
void this.scheduleEllipsis();
});
// Setting initial text
setTimeout(() => {
if (this._isTextInitialized)
void this.scheduleEllipsis();
}, 0);
}
setText(text) {
if (this._nativeElement)
this._renderer.setProperty(this._nativeElement, 'textContent', text);
}
/**
* Schedules the ellipsis calculation by waiting for the font to be fully loaded so it can be measured correctly
*/
async scheduleEllipsis() {
await document.fonts.ready;
setTimeout(() => {
if (this._nativeElement && this.text()) {
// Setting text for the text-container to adjust to its full possible height
this.setText(this.text());
if (this._nativeElement.clientHeight === this._nativeElement.scrollHeight)
return;
requestAnimationFrame(() => {
const clampedText = this.getClampedText();
if (clampedText)
this.setText(clampedText);
});
}
}, 0);
}
/**
* Calculates the multiline ellipsis by measuring word widths
* against the available space and line count.
*
* @returns clamped text or undefined if measurement went wrong
*/
getClampedText() {
if (this._nativeElement && this.text()) {
if (!this._isTextInitialized)
this._isTextInitialized = true;
let clampText = "";
const elementStyle = getComputedStyle(this._nativeElement);
const lineHeight = Number.parseFloat(elementStyle.lineHeight);
const lineCount = roundWithThreshold(this._nativeElement.clientHeight / lineHeight, 0.9);
const ellipsisWidth = this._canvasMeasureService.getRenderedStringWidth(elementStyle, ` ${this.ellipsis()} `);
if (!ellipsisWidth)
return undefined;
let usedWordsCount = 0;
let linePointer = 1;
let remainingLineWidth = this._nativeElement.clientWidth;
if (lineCount > 0) {
for (let i = 0; i < this._words().length; i++) {
// eslint-disable-next-line prefer-template
const word = i === 0 ? this._words()[i] : " " + this._words()[i];
const wordWidth = this._canvasMeasureService.getRenderedStringWidth(elementStyle, word);
if (!wordWidth)
return undefined;
// Check if word fits in line
if (fits(wordWidth, remainingLineWidth, linePointer, lineCount, ellipsisWidth)) {
clampText += word;
remainingLineWidth -= wordWidth;
usedWordsCount++;
// eslint-disable-next-line @stylistic/ts/brace-style
}
// Check if there is a next line
else if (linePointer < lineCount) {
linePointer++;
remainingLineWidth = this._nativeElement.clientWidth;
// Check if word fits in line
if (fits(wordWidth, remainingLineWidth, linePointer, lineCount, ellipsisWidth)) {
clampText += word;
remainingLineWidth -= wordWidth;
usedWordsCount++;
}
else
break;
}
else
break;
}
if (usedWordsCount > 0 && usedWordsCount < this._words().length)
clampText += this.ellipsis();
}
return clampText;
}
return undefined;
}
static ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "18.2.14", ngImport: i0, type: TextClampDirective, deps: [], target: i0.ɵɵFactoryTarget.Directive });
static ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "17.1.0", version: "18.2.14", type: TextClampDirective, isStandalone: true, selector: "[textClamp]", inputs: { text: { classPropertyName: "text", publicName: "text", isSignal: true, isRequired: true, transformFunction: null }, ellipsis: { classPropertyName: "ellipsis", publicName: "ellipsis", isSignal: true, isRequired: false, transformFunction: null } }, ngImport: i0 });
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "18.2.14", ngImport: i0, type: TextClampDirective, decorators: [{
type: Directive,
args: [{
selector: '[textClamp]',
standalone: true
}]
}] });
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eslint-disable @tseslint/no-non-null-assertion */\nimport { AfterViewInit, computed, Directive, ElementRef, inject, input, InputSignal, Renderer2, Signal } from '@angular/core';\nimport { toObservable } from '@angular/core/rxjs-interop';\nimport { animationFrameScheduler, debounceTime, filter, fromEvent, merge, Observable, throttleTime } from 'rxjs';\nimport { CanvasMeasurerService } from './services/canvas-measurer-service.service';\n\n/**\n * Rounds a number up only if its fractional part is at or above the given threshold.\n *\n * @param value - The value to round.\n * @param threshold - The fractional cutoff (0–1) above which to round up.\n * @returns The rounded integer.\n */\nfunction roundWithThreshold (value: number, threshold: number): number {\n  const integerPart: number = Math.floor(value);\n  const fraction: number = value - integerPart;\n\n  return fraction >= threshold\n    ? Math.ceil(value)\n    : integerPart;\n}\n\n/**\n * Determines whether a word of a given width fits into the remaining line width,\n * taking into account the ellipsis width on the last line.\n *\n * @param wordWidth - Pixel width of the current word.\n * @param remainingWidth - Remaining pixel width in the current line.\n * @param currentLine - 1-based index of the current line.\n * @param maxLines - Total number of allowed lines.\n * @param ellipsisWidth - Pixel width of the ellipsis string.\n * @returns True if the word can fit, false otherwise.\n */\n// eslint-disable-next-line @tseslint/max-params\nfunction fits (\n  wordWidth: number,\n  remainingWidth: number,\n  currentLine: number,\n  maxLines: number,\n  ellipsisWidth: number\n): boolean {\n  // If last word reached take ellipsis into account\n  if (currentLine === maxLines)\n    return wordWidth + ellipsisWidth <= remainingWidth;\n\n  return wordWidth <= remainingWidth;\n}\n\n/**\n * Clamps text to its available space and appends a custom ellipsis.\n *\n * @remarks\n * Limits content automatically to the available size of the parent container.\n * Takes Line height into account as well as preserving whole words.\n * Works with changing input in form of signals as well as static input.\n *\n * @example **Template (HTML)**\n * ```html\n * <p\n *   textClamp\n *   [text]=\"myText()\"\n *   [ellipsis]=\"'… more'\"></p>\n * ```\n *\n * @example **Component (TypeScript)**\n * ```ts\n * @Component({\n *   standalone: true,\n *   selector: 'app-foo',\n *   imports: [TextClampDirective]\n * })\n * export class ArticleCardComponent {\n *   protected myText: WritableSignal<string> = signal<string>(\"...\");\n *\n *   protected onMyEvent(): void {\n *    this.myText.set(\"something else...\")\n *   }\n * }\n * ```\n */\n\n@Directive({\n  selector: '[textClamp]',\n  standalone: true\n})\nexport class TextClampDirective implements AfterViewInit {\n  private _isTextInitialized: boolean = false;\n\n  private readonly _renderer: Renderer2 = inject(Renderer2);\n\n  private _htmlElement: ElementRef<HTMLElement> | undefined = inject<ElementRef<HTMLElement>>(ElementRef<HTMLElement>);\n\n  private get _nativeElement (): HTMLElement | undefined {\n    if (this._htmlElement?.nativeElement)\n      return this._htmlElement.nativeElement;\n\n\n    return undefined;\n  }\n\n  public text: InputSignal<string | undefined> = input.required();\n\n  public ellipsis: InputSignal<string> = input(\"...\");\n\n  private _textChange$: Observable<string | undefined> = toObservable(this.text);\n\n  private _canvasMeasureService: CanvasMeasurerService = inject(CanvasMeasurerService);\n\n  // eslint-disable-next-line @unicorn/consistent-function-scoping\n  private _words: Signal<string[]> = computed(() => {\n    let words: string[] = [];\n\n    if (this.text())\n\n      words = this.text()!.split(\" \");\n\n    return words;\n  });\n\n  ngAfterViewInit (): void {\n    const visibility$: Observable<Event> = fromEvent(document, \"visibilitychange\");\n    const focus$: Observable<Event> = fromEvent(window, \"focus\");\n    const resize$: Observable<Event> = fromEvent(window, \"resize\");\n    // Slower throttle for refocus\n    // eslint-disable-next-line @tseslint/typedef\n    const refocus$ = merge(visibility$, focus$).pipe(throttleTime(500));\n    // Fast throttle for change in text or resize\n    // eslint-disable-next-line @tseslint/typedef\n    const fastChange$ = merge(resize$, this._textChange$).pipe(debounceTime(10));\n\n    merge(refocus$, fastChange$)\n      .pipe(\n        filter(() => !document.hidden),\n        debounceTime(0, animationFrameScheduler)\n      )\n      .subscribe(() => {\n        void this.scheduleEllipsis();\n      });\n    // Setting initial text\n    setTimeout(() => {\n      if (this._isTextInitialized)\n        void this.scheduleEllipsis();\n    }, 0);\n  }\n\n  setText (text: string): void {\n    if (this._nativeElement)\n      this._renderer.setProperty(this._nativeElement, 'textContent', text);\n  }\n\n  /**\n   * Schedules the ellipsis calculation by waiting for the font to be fully loaded so it can be measured correctly\n   */\n  private async scheduleEllipsis (): Promise<void> {\n    await document.fonts.ready;\n    setTimeout(() => {\n      if (this._nativeElement && this.text()) {\n        // Setting text for the text-container to adjust to its full possible height\n        this.setText(this.text()!);\n\n        if (this._nativeElement.clientHeight === this._nativeElement.scrollHeight) return;\n\n        requestAnimationFrame(() => {\n          const clampedText: string | undefined = this.getClampedText();\n\n          if (clampedText)\n            this.setText(clampedText);\n        });\n      }\n    }, 0);\n  }\n\n\n  /**\n   * Calculates the multiline ellipsis by measuring word widths\n   * against the available space and line count.\n   *\n   * @returns clamped text or undefined if measurement went wrong\n   */\n  getClampedText (): string | undefined {\n    if (this._nativeElement && this.text()) {\n      if (!this._isTextInitialized)\n        this._isTextInitialized = true;\n\n\n      let clampText: string = \"\";\n\n      const elementStyle: CSSStyleDeclaration | undefined = getComputedStyle(this._nativeElement);\n      const lineHeight: number = Number.parseFloat(elementStyle.lineHeight);\n      const lineCount: number = roundWithThreshold(this._nativeElement.clientHeight / lineHeight, 0.9);\n      const ellipsisWidth: number | undefined = this._canvasMeasureService.getRenderedStringWidth(elementStyle, ` ${ this.ellipsis() } `);\n\n      if (!ellipsisWidth) return undefined;\n\n      let usedWordsCount: number = 0;\n      let linePointer: number = 1;\n      let remainingLineWidth: number = this._nativeElement.clientWidth;\n\n      if (lineCount > 0) {\n        for (let i: number = 0; i < this._words().length; i++) {\n          // eslint-disable-next-line prefer-template\n          const word: string = i === 0 ? this._words()[ i ]! : \" \" + this._words()[ i ]!;\n          const wordWidth: number | undefined = this._canvasMeasureService.getRenderedStringWidth(elementStyle, word);\n\n          if (!wordWidth) return undefined;\n\n          // Check if word fits in line\n          if (fits(wordWidth, remainingLineWidth, linePointer, lineCount, ellipsisWidth)) {\n            clampText += word;\n            remainingLineWidth -= wordWidth;\n            usedWordsCount++;\n            // eslint-disable-next-line @stylistic/ts/brace-style\n          }\n          // Check if there is a next line\n          else if (linePointer < lineCount) {\n            linePointer++;\n            remainingLineWidth = this._nativeElement.clientWidth;\n\n            // Check if word fits in line\n            if (fits(wordWidth, remainingLineWidth, linePointer, lineCount, ellipsisWidth)) {\n              clampText += word;\n              remainingLineWidth -= wordWidth;\n              usedWordsCount++;\n            } else\n              break;\n          } else\n            break;\n        }\n\n\n        if (usedWordsCount > 0 && usedWordsCount < this._words().length)\n          clampText += this.ellipsis();\n      }\n\n      return clampText;\n    }\n\n    return undefined;\n  }\n}\n\n"]}