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* Copyright bei
* Entwicklungs- und Pflegeverbund für das gemeinsame Fachverfahren gefa
*
*******************************************************************************/
import {
AfterViewInit,
Component,
ContentChild,
ElementRef,
HostBinding,
Input,
NgZone,
OnChanges,
OnDestroy,
QueryList,
SimpleChanges,
ViewChildren,
} from '@angular/core';
import { Subscription, startWith } from 'rxjs';
import { createResizeObserver } from '../utils/internal-utils';
import { Callback } from '../utils/util.types';
import { ResponsiveItemHelperDirective } from './responsive-item-helper.directive';
import { ResponsiveItemTemplateDirective } from './responsive-item-template.directive';
interface Breakpoint<K extends ResponsiveBreakpointKey> {
key: K;
size: number;
}
/**
* Type of keys in the `Breakpoints` structure.
*/
export type ResponsiveBreakpointKey = string | symbol;
/**
* Collection of breakpoints, associating keys with minimum widths. A value of `null`
* represents a default breakpoint to use if no other value applies and should be present
* only once in the structure.
*/
export type Breakpoints<K extends ResponsiveBreakpointKey> = Record<
K,
number | null
>;
/**
* Layout utility to switch between responsive items based on remaining space for some other component.
*
* The component renders its content besides an instance of the provided `ResponsiveItemTemplateDirective`. The actual breakpoint for rendering
* the item template is chosen based on the passed set of available breakpoints. The largest breakpoint, for which the corresponding rendered item
* leaves at least the specified remaining width *available for the primary content*, is chosen.
*/
@Component({
selector: 'gc-responsive-container',
templateUrl: './responsive-container.component.html',
styleUrls: ['./responsive-container.component.css'],
})
export class ResponsiveContainerComponent<K extends ResponsiveBreakpointKey>
implements OnDestroy, AfterViewInit, OnChanges
{
/**
* Reverse the tab-order of the two elements inside `gc-responsive-container`
*/
@HostBinding('class.gc-row-reverse')
@Input()
public tabReverse = false;
/** @ignore */
@ContentChild(ResponsiveItemTemplateDirective)
protected responsiveTemplate?: ResponsiveItemTemplateDirective<K>;
/** @ignore */
@ViewChildren(ResponsiveItemHelperDirective)
protected responsiveItems!: QueryList<ResponsiveItemHelperDirective<K>>;
/**
* Breakpoints to use for switching between the responsive items.
*/
@Input()
public set breakpoints(value: Breakpoints<K>) {
this._breakpoints = value;
const ar: Breakpoint<K>[] = [];
for (const key in value) {
ar.push({ key, size: value[key] ?? Number.MAX_VALUE });
}
ar.sort((a, b) => a.size - b.size);
this.arBreakpoints = ar;
// set current breakpoint if none is set (e.g. initial render) or if it became invalid,
// optimistic assumption is that the largest one will usually be correct (recalculated after content becomes visible)
if (
this.currentBreakpoint === undefined ||
!(this.currentBreakpoint in value)
) {
this.currentBreakpoint =
this.arBreakpoints[this.arBreakpoints.length - 1]?.key;
}
}
public get breakpoints() {
return this._breakpoints;
}
/** @ignore */
protected arBreakpoints: readonly Breakpoint<K>[] = [];
/** @ignore */
protected currentBreakpoint?: K;
/** @ignore */
private _breakpoints: Breakpoints<K> = {} as Breakpoints<K>;
/** @ignore */
private resizeObserver: ResizeObserver;
/** @ignore */
private sizeObserverCleanup: Callback;
/** @ignore */
private responsiveItemsObserver?: Subscription;
/** @ignore */
private breakpointUpdateTimeout?: ReturnType<typeof setTimeout>;
constructor(
private el: ElementRef<HTMLElement>,
zone: NgZone,
) {
[this.resizeObserver, this.sizeObserverCleanup] = createResizeObserver(
zone,
() => this.recomputeBreakpoint(false),
);
}
/** @ignore */
public ngOnChanges(changes: SimpleChanges): void {
if ('breakpoints' in changes && !changes.breakpoints.firstChange) {
this.recomputeBreakpoint(true);
}
}
/** @ignore */
public ngAfterViewInit(): void {
this.responsiveItemsObserver = this.responsiveItems.changes
.pipe(startWith([])) // trigger initial setup, as there are initially no changes when the subscription is created
.subscribe(() => this.setupResizeObservations());
this.recomputeBreakpoint(true);
}
/** @ignore */
public ngOnDestroy(): void {
this.responsiveItemsObserver?.unsubscribe();
this.sizeObserverCleanup();
if (this.breakpointUpdateTimeout !== undefined) {
clearTimeout(this.breakpointUpdateTimeout);
}
}
/** @ignore */
private recomputeBreakpoint(triggeredByInputChange: boolean) {
const totalWidth = this.el.nativeElement.clientWidth;
let newBreakpoint =
this.arBreakpoints.length > 0 ? this.arBreakpoints[0].key : undefined;
for (let i = 1; i < this.arBreakpoints.length; i++) {
const item = this.responsiveItems.find(
respItem => respItem.breakpoint === this.arBreakpoints[i].key,
);
if (item) {
const availableWidth =
totalWidth - item._element.nativeElement.clientWidth;
if (availableWidth > this.arBreakpoints[i - 1].size) {
newBreakpoint = this.arBreakpoints[i].key;
} else {
break;
}
} else {
console.error(
'failed to find rendered compute helper item for breakpoint',
this.arBreakpoints[i].key,
);
break;
}
}
if (this.breakpointUpdateTimeout !== undefined) {
clearTimeout(this.breakpointUpdateTimeout);
this.breakpointUpdateTimeout = undefined;
}
if (triggeredByInputChange && this.currentBreakpoint !== newBreakpoint) {
// if the breakpoint calculation was triggered by an Angular change detection cycle, immediately
// updating the current breakpoint would result in an NG0100 error (expression changed after checked),
// in this case delay the update to workaround the error.
// ideally the initially set breakpoint is guessed correctly, in which case no initial update is needed
this.breakpointUpdateTimeout = setTimeout(
() => (this.currentBreakpoint = newBreakpoint),
);
} else {
this.currentBreakpoint = newBreakpoint;
}
}
/** @ignore */
private setupResizeObservations(): void {
this.resizeObserver.disconnect();
this.resizeObserver.observe(this.el.nativeElement);
this.responsiveItems.forEach(i =>
this.resizeObserver.observe(i._element.nativeElement),
);
}
}
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