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Component,
ElementRef,
HostListener,
Inject,
OnDestroy,
OnInit,
ViewChild,
} from '@angular/core';
import { scriptVar } from '../../../../scripts/template/tools/setUp';
import { DOMComputationService } from 'src/app/services/domcomputation/domcomputation.service';
import { LogService } from 'src/app/services/log/log.service';
import { debounce } from 'src/scripts/tools/debounce/debounce';
import { Observable, of } from 'rxjs';
import { TextService } from 'src/app/services/db/text/text.service';
import { ComponentWithText } from 'src/app/interfaces/ComponentWithText';
import { ButtonBarOnHoverComponent } from '../../utilities/button-bar-on-hover/button-bar-on-hover.component';
import { LinkBarOnHoverComponent } from '../../utilities/link-bar-on-hover/link-bar-on-hover.component';
import { VisibleToLoadTextService } from 'src/app/services/visibletoloadtext/visible-to-load-text.service';
import { PreloaderService } from 'src/app/services/preloader/preloader.service';
import { Preloaders } from 'src/app/services/preloader/preloaders/preloaders';
import { MatProgressSpinnerModule } from '@angular/material/progress-spinner';
import { CommonModule } from '@angular/common';
import { LanguageModalComponent } from '../language-modal/language-modal.component';
import { ENV } from 'src/environments/injectionToken/environment-provider';
import { IEnvironment } from 'src/environments/interface/ienvironment';
/**
* Header component, displaying either a link back home to the left and a button
* to change language to the right when the screen width is enough, or a link
* back home to the left and an icon with a drop down menu on the right. The
* header also changes color once the client has scrolled passed the header.
*/
@Component({
selector: 'app-header',
templateUrl: './header.component.html',
styleUrls: ['./header.component.css'],
standalone: true,
imports: [
ButtonBarOnHoverComponent,
LinkBarOnHoverComponent,
MatProgressSpinnerModule,
CommonModule,
LanguageModalComponent,
],
})
export class HeaderComponent implements OnInit, ComponentWithText, OnDestroy {
/** The main div element of the component. */
@ViewChild('mainDiv') mainDiv!: ElementRef<HTMLElement>;
/**
* Scroll trigger value for header to change color.
*
* Defined to be the height of banner. This way
*/
trigger: number;
/**
* The state of the header, based on the scroll amount compared with the
* triger
*/
headerState: string;
/** Logger. See {@link LogService} */
logger: LogService;
/** Name used as text for the link back the the home page */
myName: Observable<string> = of('');
/** Preloader for texts. */
loaderTexts = Preloaders.TEXTS;
/** Whether or not to show the language change modal. */
showModal = false;
/** ElementRef of the button in the uncollapsed header opening the modal. */
@ViewChild('buttonHeaderModal', { read: ElementRef })
buttonHeaderModal!: ElementRef;
/** ElementRef of the button in the collapsed header opening the modal. */
@ViewChild('buttonCollapsedModal', { read: ElementRef })
buttonCollapsedModal!: ElementRef;
/** HTMLElement of the button clicked on to open the modal */
clickedEl!: HTMLElement;
/** Text icon to be clicked on to open the modal */
textIcon = of('\xa0 \xa0 🌐 \xa0 \xa0');
/** Website url */
website: string;
/**
* Header component constructor.
*
* @param domcomputation The {@link DOMComputationService}
* @param logService The {@link LogService}
* @param textService The {@link TextService}
* @param visibleToLoadTextService The {@link VisibleToLoadTextService}
* @param preloader The {@link PreloaderService}
* @param changeDetectorRef The {@link ChangeDetectorRef}
* @param environment The {@link IEnvironment}
*/
constructor(
private domcomputation: DOMComputationService,
logService: LogService,
private textService: TextService,
public visibleToLoadTextService: VisibleToLoadTextService,
public preloader: PreloaderService,
@Inject(ENV) public environment: IEnvironment
) {
this.website = environment.website;
this.trigger = 0;
this.headerState = '';
this.logger = logService.withClassName(this.constructor.name);
setTimeout(() => {
this.visibleToLoadTextService.subscribe(this);
}, 0);
}
/**
* On destroy, the component has to be unsubscribed from the
* {@link VisibleToLoadTextService} to avoid having the service try to notify a
* destroyed subscriber.
*/
ngOnDestroy(): void {
this.visibleToLoadTextService.unsubscribe(this);
}
/**
* Update the component's texts when the language is updated. See
* {@link VisibleToLoadTextService}. The subscriber design pattern is used and
* this function is used when the service notifies its subscribers to update
* the text contents after a language change. Uses {@link TextService} to get
* those contents from the database.
*/
updateTexts(): void {
this.textService.get('sylvain-janet').subscribe((v) => {
this.myName = of(v);
this.visibleToLoadTextService.textLoaded(this);
});
}
/**
* Update the trigger when the window is resized. Indeed, the banner height
* will change since it is tied to viewport height. Uses the {@link debounce}
* annotation to avoid firing this too much : resize events fire a lot during
* resizing.
*/
@HostListener('window:resize', ['$event'])
@debounce()
onResize(event: Event) {
this.updateTrigger(event);
}
/**
* On init, the trigger has to be updated and the state has to be checked
* because the client could be loading the page already scolled.
*/
ngOnInit() {
this.updateTrigger({
currentTarget: { scrollY: 0 } as Window,
} as unknown as Event);
}
/**
* Updates the trigger for the state change, as well as checks if the state
* changes. In that case, calls the method {@link updateHeader} responsible for
* making the actual changes
*/
updateTrigger(event: Event) {
if (!event.currentTarget) return;
this.trigger = this.domcomputation.getActualHeight(
document.getElementsByClassName('banner').item(0)
);
const oldHeaderState = this.headerState;
this.headerState =
(event.currentTarget as Window).scrollY > this.trigger
? scriptVar.headerStateLight
: scriptVar.headerStateDark;
if (oldHeaderState != this.headerState) {
this.logger.debug('Update trigger for dark/light header');
this.updateHeader();
}
}
/**
* Changes every element having class oldClass. Replace that class with the
* class newClass
*
* @param oldClass The class to replace
* @param newClass The new class
*/
changeEveryClass(oldClass: string, newClass: string) {
this.logger.debug('Change every class', oldClass, 'to', newClass);
const els = document.querySelectorAll('.' + oldClass);
for (let i = 0; i < els.length; i++) {
const el = els.item(i);
el.classList.remove(oldClass);
el.classList.add(newClass);
}
}
/**
* Actual update of the style of the appropriate element according to the
* state set in headerState.
*/
updateHeader() {
this.logger.debug('Update header');
if (this.headerState === 'light') {
this.changeEveryClass(
scriptVar.cssHeaderDarkClass,
scriptVar.cssHeaderLightClass
);
this.changeEveryClass(
scriptVar.cssHeaderContentDarkClass,
scriptVar.cssHeaderContentLightClass
);
}
if (this.headerState === 'dark') {
this.changeEveryClass(
scriptVar.cssHeaderLightClass,
scriptVar.cssHeaderDarkClass
);
this.changeEveryClass(
scriptVar.cssHeaderContentLightClass,
scriptVar.cssHeaderContentDarkClass
);
}
}
/**
* Update the variable headerState with the state of the header depending on
* the scrollY value. Below a threshold, the header should be dark. Once the
* scrollY value goes over, the header should be light.
*/
@HostListener('window:scroll', ['$event'])
onScroll(event: Event) {
if ((event.currentTarget as Window).scrollY > this.trigger) {
if (this.headerState == scriptVar.headerStateDark) {
this.headerState = scriptVar.headerStateLight;
this.updateHeader();
}
}
if ((event.currentTarget as Window).scrollY <= this.trigger) {
if (this.headerState == scriptVar.headerStateLight) {
this.headerState = scriptVar.headerStateDark;
this.updateHeader();
}
}
}
/**
* Get the main component element.
*
* @returns The element.
*/
getElement(): ElementRef<HTMLElement> {
return this.mainDiv;
}
/** Open the modal using the uncollapsed header button */
openModalButtonHeader() {
this.clickedEl =
this.buttonHeaderModal?.nativeElement?.children[0]?.children[0];
this.showModal = true;
}
/** Open the modal using the collapsed header button */
openModalButtonCollapsed() {
this.clickedEl =
this.buttonCollapsedModal?.nativeElement?.children[0]?.children[0];
this.showModal = true;
}
/** Close the modal */
closeModal() {
this.showModal = false;
}
}
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