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bs-modal.service.ts
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bs-modal.service.ts
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import {
ComponentRef,
Injectable,
TemplateRef,
EventEmitter,
Renderer2,
RendererFactory2,
Inject,
Optional
} from '@angular/core';
import { ComponentLoader, ComponentLoaderFactory } from 'ngx-bootstrap/component-loader';
import { ModalBackdropComponent } from './modal-backdrop.component';
import { ModalContainerComponent } from './modal-container.component';
import {
CLASS_NAME,
modalConfigDefaults,
ModalOptions,
TRANSITION_DURATIONS,
MODAL_CONFIG_DEFAULT_OVERRIDE
} from './modal-options.class';
import { BsModalRef } from './bs-modal-ref.service';
import { document } from 'ngx-bootstrap/utils';
let currentId = 1;
@Injectable({providedIn: 'platform'})
export class BsModalService {
// constructor props
config: ModalOptions;
onShow = new EventEmitter();
onShown = new EventEmitter();
onHide = new EventEmitter();
onHidden = new EventEmitter();
protected isBodyOverflowing = false;
protected originalBodyPadding = 0;
protected scrollbarWidth = 0;
protected backdropRef?: ComponentRef<ModalBackdropComponent>;
private _backdropLoader: ComponentLoader<ModalBackdropComponent>;
private modalsCount = 0;
private lastDismissReason?: string;
private loaders: ComponentLoader<ModalContainerComponent>[] = [];
private _renderer: Renderer2;
private _focusEl: Element | null = null;
constructor(
rendererFactory: RendererFactory2,
private clf: ComponentLoaderFactory,
@Optional() @Inject(MODAL_CONFIG_DEFAULT_OVERRIDE) private modalDefaultOption: ModalOptions) {
this._backdropLoader = this.clf.createLoader<ModalBackdropComponent>();
this._renderer = rendererFactory.createRenderer(null, null);
this.config = modalDefaultOption ?
(Object.assign({}, modalConfigDefaults, modalDefaultOption)) :
modalConfigDefaults;
}
/** Shows a modal */
show<T>(
// eslint-disable-next-line @typescript-eslint/no-explicit-any
content: string | TemplateRef<any> | { new(...args: any[]): T },
config?: ModalOptions<T>
): BsModalRef<T> {
this._focusEl = document.activeElement;
this.modalsCount++;
this._createLoaders();
// must be different per every show() call
const id = config?.id || currentId++;
this.config = this.modalDefaultOption ?
Object.assign({}, modalConfigDefaults, this.modalDefaultOption, config) :
Object.assign({}, modalConfigDefaults, config);
this.config.id = id;
this._showBackdrop();
this.lastDismissReason = void 0;
return this._showModal<T>(content);
}
hide(id?: number | string) {
if (this.modalsCount === 1 || id == null) {
this._hideBackdrop();
this.resetScrollbar();
}
this.modalsCount = this.modalsCount >= 1 && id != null ? this.modalsCount - 1 : 0;
setTimeout(() => {
this._hideModal(id);
this.removeLoaders(id);
}, this.config.animated ? TRANSITION_DURATIONS.BACKDROP : 0);
if (this._focusEl) {
(this._focusEl as HTMLElement).focus();
}
}
_showBackdrop(): void {
const isBackdropEnabled =
this.config.backdrop === true || this.config.backdrop === 'static';
const isBackdropInDOM =
!this.backdropRef || !this.backdropRef.instance.isShown;
if (this.modalsCount === 1) {
this.removeBackdrop();
if (isBackdropEnabled && isBackdropInDOM) {
this._backdropLoader
.attach(ModalBackdropComponent)
.to('body')
.show({ isAnimated: this.config.animated });
this.backdropRef = this._backdropLoader._componentRef;
}
}
}
_hideBackdrop(): void {
if (!this.backdropRef) {
return;
}
this.backdropRef.instance.isShown = false;
const duration = this.config.animated ? TRANSITION_DURATIONS.BACKDROP : 0;
setTimeout(() => this.removeBackdrop(), duration);
}
// eslint-disable-next-line @typescript-eslint/no-explicit-any
_showModal<T>(content: any): BsModalRef<T> {
const modalLoader = this.loaders[this.loaders.length - 1];
if (this.config && this.config.providers) {
for (const provider of this.config.providers) {
modalLoader.provide(provider);
}
}
// eslint-disable-next-line @typescript-eslint/no-explicit-any
const bsModalRef = new BsModalRef<any>();
const modalContainerRef = modalLoader
.provide({ provide: ModalOptions, useValue: this.config })
.provide({ provide: BsModalRef, useValue: bsModalRef })
.attach(ModalContainerComponent)
.to('body');
bsModalRef.hide = () => this.hide(bsModalRef.id);
bsModalRef.setClass = (newClass: string) => {
if (modalContainerRef.instance) {
modalContainerRef.instance.config.class = newClass;
}
};
bsModalRef.onHidden = new EventEmitter<unknown>();
bsModalRef.onHide = new EventEmitter<unknown>();
this.copyEvent(modalLoader.onBeforeHide, bsModalRef.onHide);
this.copyEvent(modalLoader.onHidden, bsModalRef.onHidden);
// call 'show' method after assign setClass in bsModalRef.
// it makes modal component's bsModalRef available to call setClass method
modalContainerRef.show({
content,
isAnimated: this.config.animated,
initialState: this.config.initialState,
bsModalService: this,
id: this.config.id
});
if (modalContainerRef.instance) {
modalContainerRef.instance.level = this.getModalsCount();
bsModalRef.content = modalLoader.getInnerComponent();
bsModalRef.id = modalContainerRef.instance.config?.id;
}
return bsModalRef;
}
_hideModal(id?: number | string): void {
if (id != null) {
const indexToRemove = this.loaders.findIndex(loader => loader.instance?.config.id === id);
const modalLoader = this.loaders[indexToRemove];
if (modalLoader) {
modalLoader.hide(id);
}
} else {
this.loaders.forEach(
(loader: ComponentLoader<ModalContainerComponent>) => {
if (loader.instance) {
loader.hide(loader.instance.config.id);
}
}
);
}
}
getModalsCount(): number {
return this.modalsCount;
}
setDismissReason(reason: string) {
this.lastDismissReason = reason;
}
removeBackdrop(): void {
this._renderer.removeClass(document.body, CLASS_NAME.OPEN);
this._renderer.setStyle(document.body, 'overflow-y', '');
this._backdropLoader.hide();
this.backdropRef = void 0;
}
/** Checks if the body is overflowing and sets scrollbar width */
/** @internal */
checkScrollbar(): void {
this.isBodyOverflowing = document.body.clientWidth < window.innerWidth;
this.scrollbarWidth = this.getScrollbarWidth();
}
setScrollbar(): void {
if (!document) {
return;
}
this.originalBodyPadding = parseInt(
window
.getComputedStyle(document.body)
.getPropertyValue('padding-right') || '0',
10
);
if (this.isBodyOverflowing) {
document.body.style.paddingRight = `${this.originalBodyPadding +
this.scrollbarWidth}px`;
}
}
private resetScrollbar(): void {
document.body.style.paddingRight = `${this.originalBodyPadding}px`;
}
// thx d.walsh
private getScrollbarWidth(): number {
const scrollDiv = this._renderer.createElement('div');
this._renderer.addClass(scrollDiv, CLASS_NAME.SCROLLBAR_MEASURER);
this._renderer.appendChild(document.body, scrollDiv);
const scrollbarWidth = scrollDiv.offsetWidth - scrollDiv.clientWidth;
this._renderer.removeChild(document.body, scrollDiv);
return scrollbarWidth;
}
private _createLoaders(): void {
const loader = this.clf.createLoader<ModalContainerComponent>();
this.copyEvent(loader.onBeforeShow, this.onShow);
this.copyEvent(loader.onShown, this.onShown);
this.copyEvent(loader.onBeforeHide, this.onHide);
this.copyEvent(loader.onHidden, this.onHidden);
this.loaders.push(loader);
}
private removeLoaders(id?: number | string): void {
if (id != null) {
const indexToRemove = this.loaders.findIndex(loader => loader.instance?.config.id === id);
if (indexToRemove >= 0) {
this.loaders.splice(indexToRemove, 1);
this.loaders.forEach(
(loader: ComponentLoader<ModalContainerComponent>, i: number) => {
if (loader.instance) {
loader.instance.level = i + 1;
}
}
);
}
} else {
this.loaders.splice(0, this.loaders.length);
}
}
private copyEvent(from: EventEmitter<unknown>, to: EventEmitter<unknown>) {
from.subscribe((data) => {
to.emit(this.lastDismissReason || data);
});
}
}