@ng-bootstrap/ng-bootstrap
Version:
Angular powered Bootstrap
77 lines • 13.8 kB
JavaScript
import { EMPTY, fromEvent, of, race, Subject, timer } from 'rxjs';
import { endWith, filter, takeUntil } from 'rxjs/operators';
import { getTransitionDurationMs } from './util';
import { environment } from '../../environment';
import { runInZone } from '../util';
const noopFn = () => { };
const { transitionTimerDelayMs } = environment;
const runningTransitions = new Map();
export const ngbRunTransition = (zone, element, startFn, options) => {
// Getting initial context from options
let context = options.context || {};
// Checking if there are already running transitions on the given element.
const running = runningTransitions.get(element);
if (running) {
switch (options.runningTransition) {
// If there is one running and we want for it to 'continue' to run, we have to cancel the new one.
// We're not emitting any values, but simply completing the observable (EMPTY).
case 'continue':
return EMPTY;
// If there is one running and we want for it to 'stop', we have to complete the running one.
// We're simply completing the running one and not emitting any values and merging newly provided context
// with the one coming from currently running transition.
case 'stop':
zone.run(() => running.transition$.complete());
context = Object.assign(running.context, context);
runningTransitions.delete(element);
}
}
// Running the start function
const endFn = startFn(element, options.animation, context) || noopFn;
// If 'prefer-reduced-motion' is enabled, the 'transition' will be set to 'none'.
// If animations are disabled, we have to emit a value and complete the observable
// In this case we have to call the end function, but can finish immediately by emitting a value,
// completing the observable and executing end functions synchronously.
if (!options.animation || window.getComputedStyle(element).transitionProperty === 'none') {
zone.run(() => endFn());
return of(undefined).pipe(runInZone(zone));
}
// Starting a new transition
const transition$ = new Subject();
const finishTransition$ = new Subject();
const stop$ = transition$.pipe(endWith(true));
runningTransitions.set(element, {
transition$,
complete: () => {
finishTransition$.next();
finishTransition$.complete();
},
context,
});
const transitionDurationMs = getTransitionDurationMs(element);
// 1. We have to both listen for the 'transitionend' event and have a 'just-in-case' timer,
// because 'transitionend' event might not be fired in some browsers, if the transitioning
// element becomes invisible (ex. when scrolling, making browser tab inactive, etc.). The timer
// guarantees, that we'll release the DOM element and complete 'ngbRunTransition'.
// 2. We need to filter transition end events, because they might bubble from shorter transitions
// on inner DOM elements. We're only interested in the transition on the 'element' itself.
zone.runOutsideAngular(() => {
const transitionEnd$ = fromEvent(element, 'transitionend').pipe(takeUntil(stop$), filter(({ target }) => target === element));
const timer$ = timer(transitionDurationMs + transitionTimerDelayMs).pipe(takeUntil(stop$));
race(timer$, transitionEnd$, finishTransition$)
.pipe(takeUntil(stop$))
.subscribe(() => {
runningTransitions.delete(element);
zone.run(() => {
endFn();
transition$.next();
transition$.complete();
});
});
});
return transition$.asObservable();
};
export const ngbCompleteTransition = (element) => {
runningTransitions.get(element)?.complete();
};
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{ NgZone } from '@angular/core';\nimport { EMPTY, fromEvent, Observable, of, race, Subject, timer } from 'rxjs';\nimport { endWith, filter, takeUntil } from 'rxjs/operators';\nimport { getTransitionDurationMs } from './util';\nimport { environment } from '../../environment';\nimport { runInZone } from '../util';\n\nexport type NgbTransitionStartFn<T = any> = (\n\telement: HTMLElement,\n\tanimation: boolean,\n\tcontext: T,\n) => NgbTransitionEndFn | void;\nexport type NgbTransitionEndFn = () => void;\n\nexport interface NgbTransitionOptions<T> {\n\tanimation: boolean;\n\trunningTransition: 'continue' | 'stop';\n\tcontext?: T;\n}\n\nexport interface NgbTransitionCtx<T> {\n\ttransition$: Subject<any>;\n\tcomplete: () => void;\n\tcontext: T;\n}\n\nconst noopFn: NgbTransitionEndFn = () => {};\n\nconst { transitionTimerDelayMs } = environment;\nconst runningTransitions = new Map<HTMLElement, NgbTransitionCtx<any>>();\n\nexport const ngbRunTransition = <T>(\n\tzone: NgZone,\n\telement: HTMLElement,\n\tstartFn: NgbTransitionStartFn<T>,\n\toptions: NgbTransitionOptions<T>,\n): Observable<void> => {\n\t// Getting initial context from options\n\tlet context = options.context || <T>{};\n\n\t// Checking if there are already running transitions on the given element.\n\tconst running = runningTransitions.get(element);\n\tif (running) {\n\t\tswitch (options.runningTransition) {\n\t\t\t// If there is one running and we want for it to 'continue' to run, we have to cancel the new one.\n\t\t\t// We're not emitting any values, but simply completing the observable (EMPTY).\n\t\t\tcase 'continue':\n\t\t\t\treturn EMPTY;\n\t\t\t// If there is one running and we want for it to 'stop', we have to complete the running one.\n\t\t\t// We're simply completing the running one and not emitting any values and merging newly provided context\n\t\t\t// with the one coming from currently running transition.\n\t\t\tcase 'stop':\n\t\t\t\tzone.run(() => running.transition$.complete());\n\t\t\t\tcontext = Object.assign(running.context, context);\n\t\t\t\trunningTransitions.delete(element);\n\t\t}\n\t}\n\n\t// Running the start function\n\tconst endFn = startFn(element, options.animation, context) || noopFn;\n\n\t// If 'prefer-reduced-motion' is enabled, the 'transition' will be set to 'none'.\n\t// If animations are disabled, we have to emit a value and complete the observable\n\t// In this case we have to call the end function, but can finish immediately by emitting a value,\n\t// completing the observable and executing end functions synchronously.\n\tif (!options.animation || window.getComputedStyle(element).transitionProperty === 'none') {\n\t\tzone.run(() => endFn());\n\t\treturn of(undefined).pipe(runInZone(zone));\n\t}\n\n\t// Starting a new transition\n\tconst transition$ = new Subject<void>();\n\tconst finishTransition$ = new Subject<void>();\n\tconst stop$ = transition$.pipe(endWith(true));\n\trunningTransitions.set(element, {\n\t\ttransition$,\n\t\tcomplete: () => {\n\t\t\tfinishTransition$.next();\n\t\t\tfinishTransition$.complete();\n\t\t},\n\t\tcontext,\n\t});\n\n\tconst transitionDurationMs = getTransitionDurationMs(element);\n\n\t// 1. We have to both listen for the 'transitionend' event and have a 'just-in-case' timer,\n\t// because 'transitionend' event might not be fired in some browsers, if the transitioning\n\t// element becomes invisible (ex. when scrolling, making browser tab inactive, etc.). The timer\n\t// guarantees, that we'll release the DOM element and complete 'ngbRunTransition'.\n\t// 2. We need to filter transition end events, because they might bubble from shorter transitions\n\t// on inner DOM elements. We're only interested in the transition on the 'element' itself.\n\tzone.runOutsideAngular(() => {\n\t\tconst transitionEnd$ = fromEvent(element, 'transitionend').pipe(\n\t\t\ttakeUntil(stop$),\n\t\t\tfilter(({ target }) => target === element),\n\t\t);\n\t\tconst timer$ = timer(transitionDurationMs + transitionTimerDelayMs).pipe(takeUntil(stop$));\n\n\t\trace(timer$, transitionEnd$, finishTransition$)\n\t\t\t.pipe(takeUntil(stop$))\n\t\t\t.subscribe(() => {\n\t\t\t\trunningTransitions.delete(element);\n\t\t\t\tzone.run(() => {\n\t\t\t\t\tendFn();\n\t\t\t\t\ttransition$.next();\n\t\t\t\t\ttransition$.complete();\n\t\t\t\t});\n\t\t\t});\n\t});\n\n\treturn transition$.asObservable();\n};\n\nexport const ngbCompleteTransition = (element: HTMLElement) => {\n\trunningTransitions.get(element)?.complete();\n};\n"]}